FN ISI Export Format VR 1.0 PT J AU Pohlan, J TI Complementary effects of weeds in coffee plantations in Chiapas, Mexico SO ZEITSCHRIFT FUR PFLANZENKRANKHEITEN UND PFLANZENSCHUTZ-JOURNAL OF PLANT DISEASES AND PROTECTION LA German DT Article DE coffee; weed communities; complementary effects; biomass; yield parameters AB The State of Chiapas, with 76.000 ha of coffee plantations is the most important growing area in Mexico. The coffee ecosystem with Coffea arabica and Coffea canephora are characterized by different intensities of cultivating, high diversity of soil and climatic conditions and are distributed between 450 and 1800 m a.s.l. The ethnic and cultural differences among coffee growers, small holders and farmers, influence cultivation practices leading to differences in the structure and composition of weed communities. Field experiments were carried out in three different areas of the Soconusco region of Chiapas. The dominance of weeds, the growth and yield of coffee were used to evaluate quantitatively the effects of different weed management regimes. Additionally, the use of weeds as medicinal, spice and vegetable plants, was studied. C1 Colegio Frontera Sur, ECOSUR, Tapachula 30700, Chiapas, Mexico. Univ Bonn, Inst Obst & Gemusebau, D-53121 Bonn, Germany. RP Pohlan, J, Colegio Frontera Sur, ECOSUR, Carretera Antiguo Aeropuerto Km 2,5,Apdo Postal 3, Tapachula 30700, Chiapas, Mexico. EM drjpohlan@excite.com CR AGUILAR V, 2001, THESIS SWEDISH U AGR BERLIN B, 1990, PROCOMITH CHIAPAS SE, V1 FRIESSLEBEN U, 1991, CAFE CACAO, V35 GUHARAY F, 2000, CATIE SERIE TECNICA, V44 MARTINEZ E, 1994, CAFETICULTURA ECOLOG POHLAN J, 1993, 8 S EWRS 1993 P, V2, P831 POHLAN J, 2000, Z PFLANZENKRANKHEI S, V17, P761 POHLAN J, 2001, 1 S INT PLANT MED FI, P12 POHLAN J, 2001, 5 C MEX REC FOR GUAD POHLAN J, 2001, FRUTICULTURA ORGANIC POSSO PS, 2000, MALEZAS PLANTAS UTIL STAVER C, 1999, AGROFORESTRY SUSTAIN NR 12 TC 0 PU EUGEN ULMER GMBH CO PI STUTTGART PA POSTFACH 700561 WOLLGRASWEG 41, D-70599 STUTTGART, GERMANY SN 0340-8159 J9 Z PFLANZENKR PFLANZENSCH JI Z. Pflanzenk. Pflanzens.-J. Plant Dis. Prot. PY 2002 SI Sp. Iss. 18 BP 175 EP 182 PG 8 SC Plant Sciences GA V41ZD UT ISI:000202836900020 ER PT J AU Ortiz-Pulido, R Peterson, AT Robbins, MB Diaz, R Navarro-Siguenza, AG Escalona-Segura, G TI The Mexican Sheartail (Doricha eliza): Morphology, behavior, distribution, and endangered status SO WILSON BULLETIN LA English DT Article ID GEOGRAPHIC DISTRIBUTIONS; NICHE; PREDICTION; BIRDS AB We reviewed morphological variation, taxonomic status, geographic distribution, ecology, and behavior of the poorly known hummingbird, the Mexican Sheartail (Doricha eliza), based on museum specimens and field studies. Although the broadly disjunct distribution of the species would suggest that two taxa are involved, morphological differences between the populations appear minor, not deserving of formal taxonomic recognition. Ecological differences between the two populations are stronger, however; modeled ecological niches are nearly nonoverlapping, and ontogenetic and behavioral differences may exist. We recommend that, given its extremely restricted distribution, the Veracruz population be considered critically endangered, whereas the Yucatan population be designated as having a restricted range and accorded near-threatened status. C1 Inst Ecol AC, Xalapa 91000, Veracruz, Mexico. Univ Kansas, Museum Nat Hist, Lawrence, KS 66045 USA. Univ Veracruzana, Fac Biol, Xalapa 91000, Veracruz, Mexico. Natl Autonomous Univ Mexico, Fac Ciencias, Museo Zool, Mexico City 04510, DF, Mexico. Colegio Frontera Sur, Campeche 24000, Mexico. RP Ortiz-Pulido, R, Univ Autonoma Hidalgo, Ctr Invest Biol, AP 69, Pachucha 42001, Hidalgo, Mexico. CR *AM ORN UN, 1998, CHECK LIST N AM BIRD ANDERSON RP, 2002, GLOBAL ECOL BIOGEOGR, V11, P131 AUSTIN MP, 1990, ECOL MONOGR, V60, P161 BANKS RC, 1990, AUK, V107, P191 BIBBY CJ, 1992, PUTTING BIODIVERSITY EMLEN JT, 1971, AUK, V88, P323 EMLEN JT, 1977, AUK, V94, P455 GARRIDO OH, 1999, B BR ORNITHOL CLUB, V119, P80 HOWELL SNG, 1995, GUIDE BIRDS MEXICO N JOHNSGARD PA, 1997, HUMMINGBIRDS N AM LOPEZPORTILLO J, 1993, IMPACTO AMBIENTAL AM NIX HA, 1986, ATLAS ELAPID SNAKES, P4 ORTIZ F, 1998, LAT TRADE, V6, P10 ORTIZCRESPO FI, 1972, AUK, V89, P851 ORTIZPULIDO R, 1995, ACTA ZOOL MEX, V66, P87 PETERSON AT, 1993, B BRIT ORNITHOLOGIST, V113, P166 PETERSON AT, 1998, DIVERS DISTRIB, V4, P189 PETERSON AT, 1998, IBIS, V140, P288 PETERSON AT, 1999, ECOL MODEL, V117, P159 PETERSON AT, 1999, SCIENCE, V285, P1265 PETERSON AT, 2000, BIOL CONSERV, V93, P85 PETERSON AT, 2000, P BIOL SOC WASH, V113, P864 PETERSON AT, 2001, BIOSCIENCE, V51, P363 PETERSON AT, 2001, CONDOR, V103, P599 PETERSON AT, 2001, ECOL MODEL, V144, P21 PETERSON AT, 2002, IBIS, V144, E27 PETERSON AT, 2002, PREDICTING SPECIES O, P617 RZEDOWSKI J, 1978, VEGETACION MEXICO STOCKWELL D, 1999, INT J GEOGR INF SCI, V13, P143 STOCKWELL DRB, 1992, MATH COMPUT SIMULAT, V33, P385 STOCKWELL DRB, 1999, GENETIC ALGORITHMS, V2, P123 STOCKWELL DRB, 2002, ECOL MODEL, V148, P1 STOCKWELL DRB, 2002, PREDICTING SPECIES O, P537 ZAR JH, 1996, BIOSTATISTICAL ANAL NR 34 TC 2 PU WILSON ORNITHOLOGICAL SOC PI ANN ARBOR PA MUSEUM OF ZOOLOGY UNIV MICHIGAN, ANN ARBOR, MI 48109 USA SN 0043-5643 J9 WILSON BULL JI Wilson Bull. PD JUN PY 2002 VL 114 IS 2 BP 153 EP 160 PG 8 SC Ornithology GA 620LV UT ISI:000179535600001 ER PT J AU Luna-Andrade, A Aguilar-Duran, R Nandini, S Sarma, SSS TI Combined effects of copper and microalgal (Tetraselmis suecica) concentrations on the population growth of Brachionus plicatilis Muller (Rotifera) SO WATER AIR AND SOIL POLLUTION LA English DT Article DE Brachionus plicatilis; copper; heavy metal; population growth; rotifers; toxicity ID FOOD CHLORELLA-VULGARIS; HEAVY-METALS; METHYL PARATHION; DYNAMICS; CALYCIFLORUS; DENSITY; ECOTOXICOLOGY; ZOOPLANKTON; COMMUNITIES; SENSITIVITY AB Copper compounds are commonly used to kill algal blooms in fish and shrimp ponds. However, indiscriminate use of copper in the aquaculture ponds may have a negative impact on the production of rotifers, which, in turn, can influence the final yield. In this work we studied the combined effects of chronic toxicity of copper (0, 0.125, 0.25, 0.5 and 1.0 mg L-1 of copper sulphate) and algal (Tetraselmis suecica) levels (0.05 x 10(6) and 0.10 x 10(6) cells ml(-1)) on the population growth of the saline water rotifer B. plicatilis at 25 degreesC, pH 8.5 and salinity 36parts per thousand. The population of B. plicatilis increased with increasing levels of T. suecica. Regardless of the food level, rotifers exposed to 1 mg L-1 of copper did not survive beyond 3 days. Copper of 0.125 mg L-1 caused a reduction in the population of B. plicatilis but only at low algal food level; at the high (0.2 x 10(6)) food concentration, the growth was comparable to that observed in the control suggesting that higher algal levels had an ameliorating effect on the toxicity of copper to B. plicatilis. The relation between the rotifer density and the egg-ratio was inverse and statistically significant in controls. However, this relation was non-significant in rotifers subjected to the copper concentration. The peak population density of B. plicatilis in controls varied from 36 to 251 ind. ml(-1) depending on the food level. The rate of population increase per day (r) in the controls varied from 0.24-0.63 depending on the food level. In general, an increase in food level resulted in higher peak population abundance and growth rates. The presence of copper resulted in the reduction of both r values and peak population densities of B. plicatilis. The results have been discussed in light of protective role of algae in reducing the toxicity of heavy metals to rotifers. C1 Natl Autonomous Univ Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Tlalnepantla 54090, Mexico. Acuario Veracruz, Lab Live Food Culture, Veracruz 91700, Mexico. RP Sarma, SSS, Natl Autonomous Univ Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Bldg UMF,Campus Iztacala,Av Los Barrios S-N,AP 314, Tlalnepantla 54090, Mexico. 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PY 2002 VL 141 IS 1-4 BP 143 EP 153 PG 11 SC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources GA 621YT UT ISI:000179619300008 ER PT J AU Garate-Morales, JL Reyes-Ortega, Y Alvarez-Toledano, C Gutierrez-Perez, R Ramirez-Rosales, D Zamorano-Ulloa, R Basurto-Uribe, E Hernandez-Diaz, J Contreras, R TI Spectroscopic studies of novel porphyrin-copper(II) and zinc(II) complexes that share the pinch-porphyrin family structure of iron(III) complex models of peroxidases SO TRANSITION METAL CHEMISTRY LA English DT Article ID MAGNETIC CIRCULAR-DICHROISM; NONPLANAR PORPHYRINS; OXIDE REDUCTASE; COPPER(II); OXIDATION; RESONANCE; BEHAVIOR; STATE AB Six novel pinch-porphyrin complexes [(picdien)(protoporphyrinate dimethyl ester)] copper(II) (7), [(picdien)(mesoporphyrinate dimethyl ester)] copper(II) (8) and [(picdien)(deuteroporphyrinate dimethyl ester)] copper(II) (9), [(picdien)(protoporphyrinate dimethyl ester)] zinc(II) (13), [(picdien)(mesoporphyrinate dimethyl ester)] zinc(II) (14) and [(picdien)(deuteroporphyrinate dimethyl ester)] zinc(II) (15), were prepared from the corresponding free copper(II)-porphyrins (4-6), and zinc(II)-porphyrins (10-12) and picdien (N-(3H-imidazol-4-ylmethyl)-N'-{2-[(3H-imidazol-4-ylmethyl)-amino]-ethyl }-ethane-2,3-diamine). Spectroscopic studies show that complexes (7-9) and (13-15) have the pinch-porphyrin type structure previously found in iron(III) complex models of peroxidases. Complexes (7-9), were characterized by u.v.-vis., m.c.d., and e.s.r. spectroscopy. E.s.r. spectra of the copper parent compounds (4-6) at ca. 10(-2)-10(-4) M concentrations were typical of copper(II)-dimers. The addition of the picdien ligand broke up the dimers as detected by e.s.r. Compounds (7-9) are predominantly monomeric at ca. 10(-3) M concentration. The presence of picdien in (7-9) distorts the porphyrin internal portion of the plane so as to make these four internal nitrogen atoms, coordinated to copper(II), e.s.r.-distinguishable. MO and ligand field theories were used to characterize and to evaluate the directional covalence parameters of compounds (7-9). A non-fully axial, out-of-the-porphyrin-plane bonding was found for (7-9), similar to the bonding of the pinch-porphyrins-iron(III). However the in-plane distortion produced by the presence of the picdien ligand on copper(II) is significantly larger than in pinch-porphyriniron(III). The n.m.r. data show that the porphyrin-zinc(II) is the less strained and has the weakest bonded structure. The coordination number of the pinch-porphyrin with iron(III), copper(II) and zinc(II), is in all cases six. C1 Univ Autonoma Puebla, Inst Ciencias, Ctr Quim, Puebla 72570, Mexico. Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico. Univ Autonoma Puebla, Fac Ciencias Quim, Puebla 72570, Mexico. Inst Politecn Nacl, Escuela Super Fis & Matemat, Mexico City 07738, DF, Mexico. Univ Autonoma Metropolitana Azcapotzalco, Dept Ciencias Basicas, Mexico City 02200, DF, Mexico. Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. RP Reyes-Ortega, Y, Univ Autonoma Puebla, Inst Ciencias, Ctr Quim, 14 Sur 6301, Puebla 72570, Mexico. 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Met. Chem. PD NOV PY 2002 VL 27 IS 8 BP 906 EP 917 PG 12 SC Chemistry, Inorganic & Nuclear GA 621DF UT ISI:000179572700018 ER PT J AU Cruz-Sanchez, JS Juaristi, E TI Contrasting conformational behavior of 5-methylsulfonyl-1,3-dioxane and-1,3-dithiane in the minimization of steric and electrostatic repulsive interactions SO TETRAHEDRON LETTERS LA English DT Article DE conformation; dithianes; dioxanes; sulfones; steric and strain effects; electrostatic effects ID X-RAY-DIFFRACTION; 5-SUBSTITUTED 1,3-DIOXANES; SUBSTITUENTS; CYCLOHEXANES; SULFOXIDE; SULFIDE AB The preparation of novel 1,3-dithiane derivatives, cis- and trans-2-tert-butyl-5-methylsulfonyl- 1,3-dithiane, was achieved by acid-catalyzed condensation of 2-methylsulfonyl-1,3-propanedithiol with pivalaldehyde. The former dithiol was obtained from allylmethylsulfide via the Knochel-Normant bromination-rearrangement protocol. Configurational and conformational assignment of cis- and trans-5 was based on H-1 NMR analysis, and revealed that the trans isomer adopts a normal chair conformation. By contrast, cis-5 adopts a twist-boat conformation in order to minimize the steric and electrostatic repulsive interactions that an axial methylsulfonyl group engenders. Chemical equilibration cis-5 trans-5 shows the latter to be more stable by 1.50 kcal/mol. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. Univ Veracruzana, Inst Ciencias Basicas, Xalapa 91190, Veracruz, Mexico. RP Juaristi, E, Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Apartado Postal 14-740, Mexico City 07000, DF, Mexico. 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PD DEC 16 PY 2002 VL 43 IS 51 BP 9369 EP 9372 PG 4 SC Chemistry, Organic GA 620MV UT ISI:000179537900021 ER PT J AU Sanchez-Castillo, A Cocoletzi, GH Takeuchi, N TI First principles total energy calculations of the adsorption of Cl, Cl-2, and HCl on Ge(001)-c(2 x 4) SO SURFACE SCIENCE LA English DT Article DE silicon; chlorine; semiconducting surfaces; adsorption kinetics ID CHLORINE CHEMISORPTION; SURFACE; SI(100)-(2X1); PHOTOEMISSION AB We have performed first principles total energy calculations to investigate the adsorption of Cl, Cl-2, and HCl on the Ge(0001)-c(2 x 4) surface. Based on previous experimental and theoretical results of Cl on Si(001), we have considered two different geometries for the adsorption of a single Cl atom on Ge(001). We have found that the most stable configuration corresponds to adsorption of the Cl atom along the dangling bond of a Ge atom. This geometry is similar to the one formed by a Cl atom on Si(001). For the adsorption of a Cl-2 molecule, several geometries were considered. First of all, our results indicate that the adsorption of Cl-2 as a molecule is not energetically favorable. Instead, Cl-2 dissociates into two Cl subunits. The most stable geometry was achieved when each Cl subunit is bonded to a Ge atom of the same surface dimer, along the dangling bonds. Finally we have considered the adsorption of a single HCl molecule. Again, several geometries were tested. Similar to Cl-2, adsorption of HCl as a molecule is not energetically favorable. Again, the most stable structure was obtained when HCl dissociates in to H and Cl subunits, and they are adsorbed along the dangling bonds of the same Ge-dimer. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Materia Condensada, Ensenada 22800, Baja California, Mexico. Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. RP Cocoletzi, GH, Univ Autonoma Puebla, Inst Fis, Apartado Postal J-48, Puebla 72570, Mexico. CR CAR R, 1985, PHYS REV LETT, V55, P2471 CHENG CC, 1992, PHYS REV B, V46, P12810 DEWIJS GA, 1996, PHYS REV LETT, V77, P881 DEWIJS GA, 1997, PHYS REV LETT, V78, P4877 JOHANSSON LSO, 1990, PHYS REV B, V42, P9534 KLEINMAN L, 1982, PHYS REV LETT, V48, P1425 KRUGER P, 1993, PHYS REV B, V47, P1898 LAFEMINA JP, 1992, SURF SCI REP, V16, P133 LYUBINETSKY I, 1998, PHYS REV B, V58, P7950 OKADA H, 2002, SURF SCI, V512, P287 ROMERO MT, 2001, PHYS REV B, V64 ROWE JE, 1977, PHYS REV B, V16, P1581 THORNTON G, 1989, SURF SCI, V211, P959 WINTERS HF, 1992, SURF SCI REP, V14, P161 YANG W, 1997, SURF SCI, V392, P8 NR 15 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURFACE SCI JI Surf. Sci. PD DEC 20 PY 2002 VL 521 IS 3 BP 95 EP 103 PG 9 SC Chemistry, Physical GA 621MW UT ISI:000179594600002 ER PT J AU Martinez, G Hernandez, PH Garcia-Serrano, R Saldana, XI Cocoletzi, GH TI Optical response of magnetoplasmons in periodic nanometric structures in the Faraday configuration SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article DE superlattices; magnetoplasmons; optical response ID SEMICONDUCTOR SUPERLATTICES; MAGNETIC-FIELD; REFLECTANCE AB Magnetoplasmons in periodic semiconductor nanolayers are investigated accounting for an external magnetic B-F field in the Faraday configuration. Superlattices are considered with a two-nanolayer period to perform calculations of the magnetoplasma normal modes in the infinite superlattice and the optical response when p-polarized light is incident onto the truncated system. Results of the reflectivity show a structure due to the minibands and minigaps of bulk magnetoplasmons. The reflectivity structure becomes richer as the magnetic field strength increases as well as when the period enlarges. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. BUAP, FCFM, Posgrado Optoelect, Puebla, Mexico. Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. RP Martinez, G, Univ Autonoma Puebla, Inst Fis, Apartado Postal J-48, Puebla 72570, Mexico. CR COCOLETZI GH, 1989, PHYS REV B, V39, P8403 COCOLETZI GH, 1991, PHYS REV B, V44, P11514 HENNEBERGER F, 1993, OPTICS SEMICONDUCTOR KUSHWAHA MS, 1987, PHYS REV B, V35, P3879 KUSHWAHA MS, 1989, PHYS REV B, V40, P1692 KUSHWAHA MS, 1992, SURF SCI, V268, P457 MARTINEZ G, 1999, PHYS REV B, V59, P10843 MARTINEZ G, 2000, PHYS REV B, V62, P6916 MOCHAN WL, 1987, PHYS REV B, V35, P1088 MOCHAN WL, 1992, PHYS STATUS SOLIDI B, V174, P273 NAVA RAV, 1993, PHYS REV B, V47, P3971 OLAZAGASTI EL, 1991, SOLID STATE COMMUN, V78, P9 TIGNON J, 1997, PHYS REV B, V56, P4068 NR 13 TC 2 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0749-6036 J9 SUPERLATTICE MICROSTRUCT JI Superlattices Microstruct. PD JUL PY 2002 VL 32 IS 1 BP 11 EP 17 PG 7 SC Physics, Condensed Matter GA 621NC UT ISI:000179595200002 ER PT J AU Perusquia, M Villalon, CM TI The vasodepressor effect of androgens in pithed rats: potential role of calcium channels SO STEROIDS LA English DT Article DE male sex steroids; androgens; steroid effect; 5-reduced steroids; dihydrotestosterone; etiocholanolone; vasodepressor response; hypotensive effect; blood pressure; pithed rat ID RELAXES CORONARY-ARTERIES; CA2+ ENTRY MECHANISMS; UTERINE BLOOD-FLOW; SMOOTH-MUSCLE; 4-HYDROXYLATED ESTRADIOL; INDUCED RELAXATION; THORACIC AORTA; ESTROUS-CYCLE; SEX-HORMONES; TESTOSTERONE AB Estrogens induce vasodilatation and/or hypotension in several experimental models, probably by a blockade of calcium currents. However, very little is known about the potential cardiovascular effects of androgens. We have previously shown that 5beta-reduced androgens are more potent vasorelaxants than their precursors (Delta4-3keto). 5-reduced progestins and 17beta-estradiol. The present study set out to investigate if this vasorelaxant effect of 5-reduced androgens is operative in vivo in the analysis of the potential vasodepressor effect of these compounds in vagosympathectomized, pithed rats. After increasing diastolic blood pressure (DBP) by a continuous infusion of norepinephrine (0.059 mumol kg(-1) min(-1)), i.v. bolus injections of 3alpha-hydroxy-5beta-androstan-17-one (etiocholanolone), 5-dihydrotestosterone (5beta-DHT), and its isomer 5alpha-dihydrotestosterone (5alpha-DHT) (5-25 mumol kg(-1) each) produced. separately, dose-dependent vasodepressor responses. These responses were biphasic: an immediate fall in DBP (reaching the nadir within 1.7 min) was followed by a further slow decrease that reached a maximum between 80 and 100 min after steroid administration. The order of potency of androgens in decreasing DBP was: 5beta-DHT > 5alpha-DHT = etiocholanolone for the short-lasting response and 5alpha-DHT > 5beta-DHT greater than or equal to etiocholanolone for the longer lasting response. Importantly, the same doses of these compounds produced no significant changes in heart rate. Moreover, 5beta-DHT significantly antagonized the vasopressor responses to methyl 1.4-dihydro-2,6-dimethyl-3-nitro-4-(2-trifluromethylphenyl)-pyridine-5-c arboxylate (Bay K 8644) with a blocking profile similar to that of nifedipine (NIF). This finding suggests that a blockade of voltage-operated calcium channels may be involved in androgen-induced hypotension. (C) 2002 Elsevier Science Inc. All rights reserved. C1 Univ Nacl Autonoma Mexico, Inst Invest Biomed, Mexico City 04511, DF, Mexico. CINVESTAV, IPN, Dept Farmacobiol, Mexico City 14000, DF, Mexico. RP Perusquia, M, Univ Nacl Autonoma Mexico, Inst Invest Biomed, Apdo Postal 70-492, Mexico City 04511, DF, Mexico. CR ADAMS MR, 1995, ARTERIOSCL THROM VAS, V15, P562 BIRKENHAGERGILL.EG, 1994, ANN NY ACAD SCI, V719, P543 CHOU TM, 1996, CIRCULATION, V94, P2614 COSTARELLA CE, 1996, J PHARMACOL EXP THER, V277, P34 CREWS JK, 1999, ARTERIOSCL THROM VAS, V19, P1034 CREWS JK, 1999, CLIN EXP PHARMACOL P, V26, P707 DEENADAYALU VUP, 2001, AM J PHYSIOL-HEART C, V281, H1720 DUBEY RK, 2001, AM J PHYSIOL-RENAL, V280, F365 ENGLISH KM, 2001, HORM METAB RES, V33, P645 FORD SP, 1984, AM J OBSTET GYNECOL, V150, P480 GREENBERG S, 1973, P SOC EXP BIOL MED, V142, P883 HONDA H, 1999, HYPERTENSION, V34, P1232 HUTCHISON SJ, 1997, HERZ, V22, P141 JIANG CW, 1991, BRIT J PHARMACOL, V104, P1033 KUBLIGARFIAS C, 1980, STEROIDS, V35, P633 KUBLIGARFIAS C, 1982, NEUROSCIENCE, V7, P2777 KUBLIGARFIAS C, 1983, P W PHARMACOL SOC, V26, P31 KUBLIGARFIAS C, 1987, ACTA PHYSIOL PHARM L, V37, P357 MIGEON CJ, 1957, J CLIN ENDOCR METAB, V17, P1051 MOSNAROVA A, 1994, ACTA PHYSL HUNG, V82, P251 MURPHY JG, 1999, J PHARMACOL EXP THER, V291, P44 OMAR HA, 1995, J CLIN ENDOCR METAB, V80, P370 ORENTREICH N, 1984, J CLIN ENDOCR METAB, V59, P551 PERUSQUIA M, 1990, LIFE SCI, V47, P1547 PERUSQUIA M, 1991, MED SCI RES, V19, P177 PERUSQUIA M, 1991, P W PHARMACOL SOC, V34, P395 PERUSQUIA M, 1991, P W PHARMACOL SOC, V34, P89 PERUSQUIA M, 1996, GEN PHARMACOL-VASC S, V27, P181 PERUSQUIA M, 1996, LIFE SCI, V58, P913 PERUSQUIA M, 1999, EUR J PHARMACOL, V371, P169 PERUSQUIA M, 2001, ENDOCRINE, V15, P63 REGELSON W, 1988, ANN NY ACAD SCI, V521, P260 REGELSON W, 1990, BIOL ROLE DEHYDROEPI, P1 SAXENA PR, 1990, J CARDIOVASC PHARM, V15, S17 SHAN J, 1994, AM J PHYSIOL, V266, H967 SHIPLEY RE, 1947, P SOC EXP BIOL MED, V64, P453 SPEDDING M, 1985, TRENDS PHARMACOL SCI, V6, P101 STICE SL, 1987, BIOL REPROD, V36, P361 STICE SL, 1987, BIOL REPROD, V36, P369 TEOH H, 2000, CARDIOVASC RES, V45, P1010 TEPAREENAN P, 2002, BRIT J PHARMACOL, V135, P735 VERMEULEN A, 1980, ADRENAL ANDROGENS, P207 WEBB CM, 1999, CIRCULATION, V100, P1690 WHITE RE, 1995, CIRC RES, V77, P936 YUE P, 1995, CIRCULATION, V91, P1154 ZHANG F, 1994, AM J PHYSIOL, V266, P975 NR 46 TC 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0039-128X J9 STEROIDS JI Steroids PD DEC PY 2002 VL 67 IS 13-14 BP 1021 EP 1028 PG 8 SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA 620CX UT ISI:000179516800004 ER PT J AU Garcia-Manzano, A Gonzalez-Llaven, J Jaimez, R Franco, Y Avila, ME Rubio-Poo, C Lemini, C TI Changes on hemostatic parameters induced by 17 beta-estradiol, ethinylestradiol, and the 17 beta-aminoestrogen pentolame in the male Wistar rat SO STEROIDS LA English DT Article DE estradiol; ethinylestradiol; 17 beta-aminoestrogens; coagulation system; fibrinogen; platelet aggregation ID ESTROGEN; ANTICOAGULANT; DISEASE AB Oral contraceptives containing estrogens increases the incidence of thromboembolic events. In contrast, administration of 17beta-aminoestrogens prolonged blood clotting time (BCT) in rodents. We studied the effect of estradiol (E-2), ethinylestradiol (EE) and pentolame on some screening hemostatic tests. BCT was evaluated 24, 48, 72 and 96 h post-treatment. Rats received subcutaneously (s.c.) for five consecutive days E-2 (0.1-1000 mug), EE (1-1000 mug). pentolame (0.1-1000 mug). or vehicle (propyleneglycol 0.3 ml). At 48 h post-treatment E-2 (1000 mug) diminished BCT (32%, P < 0.01), in contrast pentolame (1000 mug) augmented BCT by 41% (P < 0.01). After 72 h, E, showed procoagulant effects with 10, 100 and 1000 mug doses (-45, -30, and -21%, respectively). Significant effects on BCT of EE were observed 72 h after with 1000 mug (-12%, P < 0.05). Animals were treated s.c. for two consecutive days with E-2 (3 mg/100 g), pentolame (4 mg), or vehicle (0.1 ml). BCT, bleeding time (BT), platelet aggregation (PA), prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT) and fibrinogen concentration were determined. E-2 produced a significant diminution on BCT (-20%) after 72 h whereas pentolame increased BCT from 24 to 96 h (62%, maximal response at 48 h). APTT and PT coagulation times of the groups treated with E, and pentolame were lengthened (33 and 29%; 16 and 24%, respectively; P < 0.05). Fibrinogen concentration increased (115%, P < 0.01) only in the pentolame-treated group. Pentolame and E-2 produced any effects on BT and PA compared with control groups, indicating that platelet function was not modified. Our results indicate that E,, EE and pentolame affects the plasmatic phase of the hemostatic mechanism. (C) 2002 Elsevier Science Inc. All rights reserved. C1 Natl Autonomous Univ Mexico, Fac Med, Dept Farmacol, Mexico City 04510, DF, Mexico. La Raza IMSS, CMN, Dept Hematol, Mexico City, DF, Mexico. UNAM, Dept FES Zaragoza, Mexico City, DF, Mexico. RP Lemini, C, Natl Autonomous Univ Mexico, Fac Med, Dept Farmacol, Ciudad Univ,Apartado Postal 70-297, Mexico City 04510, DF, Mexico. CR BLOMBACK M, 1997, THROMB HAEMOSTASIS, V77, P105 BORN GVR, 1967, NATURE, V215, P1027 BRECHER G, 1950, J APPL PHYSIOL, V3, P365 CLAUSS A, 1957, ACTA HAEMATOL-BASEL, V17, P237 DEJANA E, 1982, THROMBOSIS HAEMOST, V48, P108 DELAPENA A, 1993, STEROIDS, V58, P407 DEMAAT MPM, 1999, LAB TECHNIQUES THROM, P79 FERREIRA AC, 2000, CONTRACEPTION, V64, P353 GEMBITSKII EV, 1994, KLIN MED MOSCOW, V72, P30 GORDON T, 1978, ANN INTERN MED, V89, P157 GRIENINGER G, 1983, ANN NY ACAD SCI, V408, P469 HENDERSON BE, 1988, AM J OBSTET GYNECOL, V159, P312 HUCH KM, 1987, THROMB RES, V48, P41 JAIMEZ R, 2000, J STEROID BIOCHEM, V73, P59 KALIN MF, 1990, STEROIDS, V55, P330 KUHL H, 1996, MATURITAS, V24, P1 LEMINI C, 1993, STEROIDS, V58, P457 LEMUS AE, 1998, STEROIDS, V63, P433 MAMMEN EF, 1982, AM J OBSTET GYNECOL, V142, P781 MAMMEN EF, 2000, HEMATOL ONCOL CLIN N, V13, P1045 MANDOKI JJ, 1983, P W PHARMACOL SOC, V26, P45 PROCTOR RR, 1961, AM J CLIN PATHOL, V36, P212 QUICK AJ, 1954, NEW ENGL J MED, V290, P751 RAMPLING MW, 1976, PROG CHEM FIBRINOLYS, V2, P91 ROSENDAAL FR, 2002, ARTERIOSCL THROM VAS, V22, P201 RUBIOPOO C, 1985, STEROIDS, V45, P159 RUBIOPOO C, 1990, STEROIDS, V55, P83 RUBIOPOO C, 1993, MED CHEM RES, V7, P67 WREN BG, 1992, MED J AUSTRALIA, V157, P204 ZAR JH, 1984, BIOSTAT ANAL, P194 NR 30 TC 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0039-128X J9 STEROIDS JI Steroids PD DEC PY 2002 VL 67 IS 13-14 BP 1129 EP 1135 PG 7 SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA 620CX UT ISI:000179516800016 ER PT J AU Estrada, M Cerdeira, A Ortiz-Conde, A Sanchez, FJG Iniguez, B TI Extraction method for polycrystalline TFT above and below threshold model parameters SO SOLID-STATE ELECTRONICS LA English DT Article DE TFT modeling; parameter extraction procedure; TFT mobility modeling AB A procedure is presented to extract above and sub-threshold model parameters in polysilicon TFTs. It is based on the integration of the experimental data current, which has the advantage of reducing the effects of experimental noise. This method is applied to the linear and saturation regions for the above-threshold regime and allows the extraction of all the above-threshold and sub-threshold parameters. We already presented a unified extraction method for the above threshold parameters of a-Si:H and polysilicon TFTs, where the above-threshold regime the mobility is modeled as a function of the gate voltage to a power. An integration procedure is used to extract the device model parameters. In this paper, we complete the extraction procedure to cover all the device operation regions, that is the sub-threshold and above-threshold regimes. The extraction procedure provides in addition the possibility of monitoring the crystallization process of a-Si:H TFTs into polysilicon, which has become a widely used process of fabricating low temperature polysilicon TFTs. The process of polycrystallization manifests itself by a variation and change in sign of one of the model parameters. Extracted parameters can be correlated to input parameters required by AIM-Spice circuit simulator for device modeling. The accuracy of the simulated curves using the extracted parameters is verified with measurements. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 CINVESTAV, Secc Elect Estado Solido, Dept Ingn Elect, Mexico City 07300, DF, Mexico. Univ Simon Bolivar, Lab Elect Estado Solido, Caracas 1080A, Venezuela. Univ Rovira & Virgili, Dept Ing Elect & Automat, Tarragona 43001, Spain. RP Estrada, M, CINVESTAV, Secc Elect Estado Solido, Dept Ingn Elect, Av IPN No 2508,Apdo Postal 14-740, Mexico City 07300, DF, Mexico. CR CERDEIRA A, 2001, SOLID STATE ELECTRON, V45, P1077 ESTRADA M, 2002, ICCSCD 2002 AR APR 1 FJELDLY T, 1998, INTRO DEVICE MODELIN INIGUEZ B, 1999, SOLID STATE ELECT, V43, P1818 NR 4 TC 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD DEC PY 2002 VL 46 IS 12 BP 2295 EP 2300 PG 6 SC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter GA 620DA UT ISI:000179517100041 ER PT J AU Gaggero-Sager, LM Mora-Ramos, ME TI Single-particle energy states in the two-dimensional electron gas of GaN-based single heterostructure field effect transistors SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article ID THOMAS-FERMI APPROXIMATION; PIEZOELECTRIC POLARIZATION; DENSITY AB A Thomas-Fermi-based model for the electronic energy spectrum in nitride single heterostructure field effect transistors is introduced. The high values of the sheet density charges induced at an AlxGa1-xN/GaN interface guarantee the validity of the approximation. As a result, a simple analytical potential model becomes available for device designing. Single electron states contain information of the many-body Coulomb effects in the gas through the Hartree and exchange potentials. Qualitative features of the potential profile and energy spectrum are well reproduced. Comparison with reported self-consistent Schrodinger-Poisson calculations gives a very good quantitative agreement as well. Results are also used to estimate the drift mobility in the two-dimensional electron gas adjacent to the interface. A new way of determining the strain relaxation in the AlxGa1-xN layer is proposed. C1 CSIC, Inst Ciencia Mat Madrid, Madrid, Spain. Autonoma Estado Morelos, Fac Ciencias, Cuernavaca 62210, Morelos, Mexico. RP Gaggero-Sager, LM, CSIC, Inst Ciencia Mat Madrid, Cantoblanco, Madrid, Spain. CR AMBACHER O, 2000, J APPL PHYS, V87, P334 CHEN Q, 1999, MAT SCI ENG B-SOLID, V59, P395 GAGGEROSAGER LM, IN PRESS GAGGEROSAGER LM, 1998, PHYS REV B, V57, P543 GAGGEROSAGER LM, 1999, J MATH CHEM, V25, P317 GAGGEROSAGER LM, 2001, DIAM RELAT MATER, V10, P1340 IORIATTI L, 1990, PHYS REV B, V41, P8340 MAEDA N, 1998, APPL PHYS LETT, V73, P1856 MORARAMOS ME, 2000, PHYS STATUS SOLIDI B, V220, P175 NG HM, 1998, APPL PHYS LETT, V73, P821 RIDLEY BK, 2000, PHYS REV B, V61, P16862 SACCONI F, 2001, IEEE T ELECTRON DEV, V48, P450 SUZUKI M, 1995, PHYS REV B, V52, P8132 NR 13 TC 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 J9 SEMICOND SCI TECHNOL JI Semicond. Sci. Technol. PD NOV PY 2002 VL 17 IS 11 BP 1180 EP 1183 PG 4 SC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter GA 620QX UT ISI:000179545000012 ER PT J AU Galan, OV Larramendi, JV Riech, I Pena, G Iribarren, A Aguilar-Hernandez, J Contreras-Puente, G TI Characterization of the passivation of CdS thin films grown by chemical bath deposition on InP SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article ID CADMIUM-SULFIDE; SURFACE AB Thin films of US with different nominal ratios c (thiourea)/c (CdCl2) have been grown by conventional chemical bath deposition on an InP substrate, in order to study the influence of each film on the surface passivation of the InP sample. The values of the surface recombination velocity were determined by the photoacoustic technique (PA) and photoluminescence. Atomic force microscopy measurements were also used to correlate the results obtained from the PA measurements. C1 Univ La Habana, Fac Fis, IMRE, Havana 10400, Cuba. IPN, Ctr Invest Ciencia Aplicada & Tecnol Avanzada, Mexico City 11500, DF, Mexico. IPN, Escuela Super Fis & Matemat, Mexico City 07738, DF, Mexico. IPN Altamira, CICATA, Mexico City, DF, Mexico. RP Galan, OV, Univ La Habana, Fac Fis, IMRE, Havana 10400, Cuba. CR FROMENT M, 1995, J ELECTROCHEM SOC, V142, P2642 HE LL, 1999, JPN J APPL PHYS 1, V38, P1119 PEARSALL TP, 1982, GAINASP ALLOY SEMICO PINTONETO A, 1989, PHYS REV B, V40, P3924 RIECH I, 1999, J APPL PHYS, V86, P6222 RIECH I, 1999, SEMICOND SCI TECH, V14, P543 SAITO S, 1994, 1 WORLD C PHOT SOL E VACCARO K, 1995, APPL PHYS LETT, V67, P527 VACCARO K, 1996, J ELECTRON MATER, V25, P603 VIGIL O, 2001, MATER RES BULL, V36, P521 WILMSEN CW, 1989, J VAC SCI TECHNOL B, V7, P851 NR 11 TC 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 J9 SEMICOND SCI TECHNOL JI Semicond. Sci. Technol. PD NOV PY 2002 VL 17 IS 11 BP 1193 EP 1197 PG 5 SC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter GA 620QX UT ISI:000179545000015 ER PT J AU Estrella, V Nair, MTS Nair, PK TI Thallium antimony sulfide and thallium bismuth sulfide thin films produced by heating chemically deposited multi-layers SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article AB Thin films of antimony sulfide and bismuth sulfide, each about 200 nm in thickness, were deposited from aqueous baths on glass substrates. Thallium sulfide thin films were subsequently deposited on these films from a bath containing thallium nitrate, sodium citrate, sodium hydroxide and thiourea solutions. XRD studies confirmed the formation of TlSbS2 and TlBiS2, respectively, when Sb2S3-Tl2S and Bi2S3-Tl2S layers were heated in a nitrogen atmosphere at 300 degreesC for 1 h. When a layer of Bi2S3-Sb2S3-Tl2S was heated at 280 degreesC, a composite film consisting of Tl4Bi2S5 and TlSb3S5 was produced. Optical bandgaps of these materials were found to be 1.85 eV (TlSbS2), 0.15 eV (TlBiS2) and about 1 eV for the composite film (Tl4Bi2S5 + TlSb3S5). In the visible spectral region, the optical absorption coefficients of these materials are about 10(5) cm(-1). Values of dark conductivity are 10(-7) Omega(-1) cm(-1) (TlSbS2) 10(-4) Omega(-1) cm(-1) (TIBiS2) and 10(-6) Omega(-1) cm(-1) for the composite film. All the films are photoconductive. C1 Univ Nacl Autonoma Mexico, Ctr Invest Energia, Dept Solar Energy Mat, Temixco 62580, Morelos, Mexico. RP Estrella, V, Univ Nacl Autonoma Mexico, Ctr Invest Energia, Dept Solar Energy Mat, Temixco 62580, Morelos, Mexico. CR CHOPRA KL, 1982, PHYS THIN FILMS, V12, P201 ESTRELLA V, 2001, MOD PHYS LETT B, V15, P737 MADELUNG O, 1992, SEMICONDUCTORS OTHER, P149 MANDAL A, 1983, THIN SOLID FILMS, V110, P65 MANE RS, 2000, MATER CHEM PHYS, V65, P1 NAIR MTS, 1999, J CRYST GROWTH, V208, P248 NAIR PK, 1992, SEMICOND SCI TECH, V7, P239 NAIR PK, 1997, J MATER RES, V12, P651 NAIR PK, 1998, SOL ENERG MAT SOL C, V52, P313 NAIR PK, 2001, SEMICOND SCI TECH, V16, P885 RODRIGUEZLAZCANO Y, 2001, J CRYST GROWTH, V223, P399 SMITH RA, 1978, SEMICONDUCTORS+, P309 NR 12 TC 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 J9 SEMICOND SCI TECHNOL JI Semicond. Sci. Technol. PD NOV PY 2002 VL 17 IS 11 BP 1198 EP 1204 PG 7 SC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter GA 620QX UT ISI:000179545000016 ER PT S AU Klimova, T Solis, D Ramirez, J Lopez-Agudo, A TI NiMo/HNaY(x)-Al2O3 catalysts for hydrodesulfurization of hindered dibenzothiophenes: effect of the preparation method SO SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS SE STUDIES IN SURFACE SCIENCE AND CATALYSIS LA English DT Article ID 4,6-DIMETHYLDIBENZOTHIOPHENE AB Three NiMo-HNaY-alumina catalysts with similar composition were prepared by different methods and tested in the hydrodesulfurization of dibenzothiophene (DBT) and 4,6-dimethyl-DBT. It was found that the catalyst preparation method induces some changes of the characteristics of the deposited metallic species as well as of the acidic properties of the zeolite component. These changes affect the catalytic behavior in the hydrodesulfurization of DBT and 4,6-DMDBT. Acidic properties of the catalyst seem to be more important for the conversion of alkyl-substituted DBT. C1 Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Quim, UNICAT, Mexico City 04510, DF, Mexico. CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain. RP Klimova, T, Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Quim, UNICAT, Cd Univ, Mexico City 04510, DF, Mexico. CR BATAILLE F, 2000, J CATAL, V191, P409 CORDERO RL, 2000, APPL CATAL A-GEN, V202, P23 EMEIS CA, 1993, J CATAL, V141, P347 ISODA T, 1996, ENERG FUEL, V10, P482 KLIMOVA T, 1999, STUD SURF SCI CATAL, V127, P373 KNUDSEN KG, 1999, APPL CATAL A-GEN, V189, P205 LANDAU MV, 1996, J CATAL, V159, P236 LOPEZAGUDO A, 1986, POLYHEDRON, V5, P187 MICHAUD P, 1998, APPL CATAL A-GEN, V169, P343 OKAMOTO Y, 1997, CATAL TODAY, V39, P45 PORTELA L, 1995, CATAL REV, V37, P699 SHAFI R, 2000, CATAL TODAY, V59, P423 NR 12 TC 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 J9 STUD SURF SCI CATAL PY 2002 VL 143 BP 267 EP 275 PG 9 GA BV62A UT ISI:000179552800029 ER PT S AU Rebollar, M Yates, M Valenzuela, MA TI Application of experimental design for NOx reduction by Pd-Cu catalysts SO SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS SE STUDIES IN SURFACE SCIENCE AND CATALYSIS LA English DT Article DE experimental design; NO reduction; environmental catalysis AB The possibilities of working with experimental design and the corresponding model to determine the formulation of new catalysts and calculate a priori their expected conversion values was studied. Eight Pd-Cu catalysts supported on mixed Al-Mg oxides prepared via a sol-gel route were produced and evaluated in the reduction of NO employing propane as the reducing agent. This technique greatly reduces the number of experiments necessary in order to define the factors of greatest importance in the preparation and operational variables, thus reducing the time needed to fine tune a catalyst composition towards the particular reaction system under study. C1 Inst Catalisis & Petroleoquim, Madrid 28049, Spain. UPALM, Inst Politecn Nacl, ESIQIE, Lab Catalisis & Mat, Mexico City 07738, DF, Mexico. RP Rebollar, M, Inst Catalisis & Petroleoquim, Madrid 28049, Spain. CR BARCELO MR, 2000, THESIS MAESTRIA ESIQ BOX G, 1986, STAT EXPT INTRO DESI CHIN YH, 1999, CATAL TODAY, V54, P419 COX D, 1958, PLANNING EXPT CRABTREE RH, 1996, CHEMTEC, V10, P21 FREMMAN CM, 1999, CHEMTEC, V10, P27 GENNARI F, 2000, CATAL REV, V42, P385 HENCH LL, 1990, CHEM REV, V44, P639 KINTAICHI Y, 1990, CATAL LETT, V6, P239 KOBYLINSKY TP, 1973, J CATAL, V25, P149 YOGO K, 1993, CATAL LETT, V19, P131 NR 11 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 J9 STUD SURF SCI CATAL PY 2002 VL 143 BP 407 EP 414 PG 8 GA BV62A UT ISI:000179552800045 ER PT S AU Nares, R Ramirez, J Gutierrez-Alejandre, A Cuevas, R Louis, C Klimova, T TI Ni/H beta-zeolite catalysts prepared by deposition-precipitation SO SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS SE STUDIES IN SURFACE SCIENCE AND CATALYSIS LA English DT Article ID NI/SIO2 MATERIALS; NI(II) PHASE; SILICA; NICKEL; REDUCTION; SUPPORT; STATE; IONS AB In the preparation of Ni/Hbeta catalysts by the deposition-precipitation method (DP), nickel hydrosilicates are formed mainly but not exclusively in the external surface of the HP zeolite. The strong metal-support interaction induced by the DP preparation method prevents the Ni metal particles from sintering during the activation of the catalysts (calcination and reduction) and a homogeneous distribution of small nickel particles is obtained. The catalyst prepared by DP showed better catalytic activity in the hydrogenation of naphthalene than the catalyst prepared by cationic competitive exchange. C1 UNAM, Fac Quim, UNICAT, Dept Ingn Quim, Mexico City 04510, DF, Mexico. Univ Paris 06, URA 1106 CNRS, Lab React Surface, F-75252 Paris 05, France. Inst Mexicano Petr, Mexico City 07730, DF, Mexico. RP Nares, R, UNAM, Fac Quim, UNICAT, Dept Ingn Quim, Mexico City 04510, DF, Mexico. CR BRECK DW, 1974, ZEOLITE MOL SIEVES S, P415 BURATTIN P, 1998, J PHYS CHEM B, V102, P2722 BURATTIN P, 1999, J PHYS CHEM B, V103, P6171 CARRIAT JY, 1998, J AM CHEM SOC, V120, P2059 CLAUSE O, 1991, J CATAL, V130, P21 CLAUSE O, 1992, J AM CHEM SOC, V114, P4709 COENEN JWE, 1989, APPL CATAL, V54, P65 DECARREAU A, 1989, CR ACAD SCI II-MEC P, V308, P301 ERTL G, 1999, PREPARATION SOLID CA, P460 ESPINOS JP, 1992, J CATAL, V136, P415 GENIN P, 1991, EUR J SOL STATE INOR, V28, P506 GEUS JW, 1967, 6705259, NL GEUS JW, 1968, 6813236, NL GEUS JW, 1983, PREPARATION CATALYST, V3, P1 GREGG SJ, 1967, ADSORPTION SURFACE A, P173 HERMANS LAM, 1979, PREPARATION CATALYST, V2, P113 KERMAREC M, 1994, J PHYS CHEM-US, V98, P12008 LEOFANTI G, 1998, CATAL TODAY, V41, P207 MILE B, 1988, J CATAL, V114, P217 MODESIR H, 1987, B MINERAL, V110, P409 RABO JA, 1976, ACS MONOGR SER, V171, P80 SZOSTAK R, 1989, MOL SIEVES PRINCIPLE, P282 VANDILLEN JA, 1977, P 6 INT C CAT LOND 1, P667 NR 23 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 J9 STUD SURF SCI CATAL PY 2002 VL 143 BP 537 EP 545 PG 9 GA BV62A UT ISI:000179552800059 ER PT S AU Escobar, J De Los Reyes, JA Viveros, T TI Sol-Gel Al2O3 structure modification by Ti and Zr addition. A NMR study SO SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS SE STUDIES IN SURFACE SCIENCE AND CATALYSIS LA English DT Article ID MIXED-OXIDE SUPPORTS; LEWIS ACIDITY; SURFACE SITES; ALUMINA AB In order to assess the effect of various synthesis parameters and the presence of a second oxide (TiO2 or ZrO2) at different concentrations on the Al2O3 structure, the corresponding samples were prepared by low-temperature sol-gel method. The oxides were characterized by N-2 physisorption, XRD and Al-27 MAS-NMR. In all samples calcined at T-c less than or equal to 973 K four-, five- and six-coordinated aluminum were detected. A pseudospinel model was used to evaluate the structural changes in the different oxides. The sol-gel Al2O3 calcined at 1173 K (Al-VI/Al(IV)less than or equal tosimilar to5.7, no metastable pentahedral aluminum) was the material that better fitted the proposed model. AL(2)O(3) oxides calcined at different temperatures were studied in the isopropanol dehydration in order to correlate their performance to the amounts of Al-IV. C1 Inst Mexicano Petr, Mexico City 07730, DF, Mexico. UAM Iztapalapa, Area Ing Q, Mexico City 09360, DF, Mexico. RP Escobar, J, Inst Mexicano Petr, Eje Cent Lazaro Cardenas 152, Mexico City 07730, DF, Mexico. CR BURNHAM CW, 1961, Z KRISTALLOGR, V115, P269 CHEN FR, 1992, J CATAL, V133, P263 CHIARO SSX, 1998, STUD SURF SCI CATAL, V118, P633 DATURI M, 1998, J EUR CERAM SOC, V18, P1079 ESCOBAR J, 2000, IND ENG CHEM RES, V39, P666 GATES BC, 1992, CATALYTIC CHEM GUTIERREZALEJANDRE A, 1998, MICROPOR MESOPOR MAT, V23, P265 JOHN CS, 1983, APPL CATAL, V6, P341 KLIMOVA T, 1998, STUD SURF SCI CATAL, V118, P807 KNOZINGER H, 1978, CATAL REV SCI ENG, V17, P31 KURETI S, 2002, APPL CATAL A-GEN, V225, P251 MILLER JM, 1998, J PHYS CHEM B, V102, P6465 MONTOYA JA, 1994, J SOL-GEL SCI TECHN, V2, P431 NARAYANAN CR, 1992, J CATAL, V138, P659 PAULING L, 1960, NATURE CHEM BOND SAAD ABM, 1993, APPL CATAL A-GEN, V94, P71 TOBA M, 1994, J MATER CHEM, V4, P585 WANG JA, 1999, J PHYS CHEM B, V103, P299 NR 18 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 J9 STUD SURF SCI CATAL PY 2002 VL 143 BP 547 EP 554 PG 8 GA BV62A UT ISI:000179552800060 ER PT J AU Alcaraz-Melendez, L Real-Cosio, S Robert, ML TI Morphological comparison of damiana (Turnera diffusa, Willd.) regenerated in vitro from leaves cultured in solidified medium and liquid cultures SO SCIENTIA HORTICULTURAE LA English DT Article DE Damiana; liquid culture; solidified medium; Turnera diffusa ID PLANTS AB Damiana, a shrub of arid and semi-arid regions, is an important socio-economic plant. Its leaves and stems are used for flavoring and infusion. Damiana is reported to be a nervous system stimulant, aphrodisiac, and diuretic. The only source of stems and leaves are wild plants, and conditions for seed germination and propagation are not known. Damiana plants were micropropagated in liquid culture and solidified medium, and grown in field. Differences in growth were observed between the two types of plants. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Ctr Invest Biol Noroeste, Lab Biotecnol Vegetal, CIBNOR, La Paz 23000, Baja California, Mexico. Ctr Invest Cient Yucatan, Unidad Biotecnol, CICY, Merida 97310, Yucatan, Mexico. RP Alcaraz-Melendez, L, Ctr Invest Biol Noroeste, Lab Biotecnol Vegetal, CIBNOR, POB 128, La Paz 23000, Baja California, Mexico. CR ALCARAZMELENDEZ L, 1994, PLANT CELL REP, V13, P679 MEIJER EGM, 1988, PHYSIOL PLANTARUM, V74, P225 MURASHIGE T, 1962, PHYSIOL PLANTARUM, V15, P473 SINK KC, 1983, HDB PLANT CELL CULTU, V5, P654 VUYLSTEKE D, 1988, SCI HORTIC-AMSTERDAM, V36, P79 WIGGINS IL, 1980, FLORA BAJA CALIFORNI, P817 NR 6 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-4238 J9 SCI HORT-AMSTERDAM JI Sci. Hortic. PD DEC 6 PY 2002 VL 96 IS 1-4 BP 293 EP 301 PG 9 SC Horticulture GA 620BQ UT ISI:000179513500026 ER PT J AU Hernandez, E Mondragon, A Jauregui, A TI Jordan blocks and Gamow-Jordan eigenfunctions associated to a double pole of the S-matrix SO REVISTA MEXICANA DE FISICA LA English DT Article DE non-relativistic scattering theory; multiple resonances; resonance reactions; Berry's phase ID RESONANT STATE; SCATTERING; DEGENERACY; VECTORS; PHASE AB An accidental degeneracy of resonances gives rise to a double pole in the scattering matrix, a double zero in the Jost function and a Jordan chain of length two of generalized Gamow-Jordan eigenfunctions of the radial Schrodinger equation. The generalized Gamow-Jordan eigenfunctions are basis elements of an expansion in bound and resonant energy eigenfunctions plus a continuum of scattering wave functions of complex wave number. In this biorthonormal basis, any operator f(H-r((l))) which is a regular function of the Hamiltonian is represented by a complex matrix wich is diagonal except for a Jordan block of rank two. The occurrence of a double pole in the Green's function, as well as the non-exponential time evolution of the Gamow-Jordan generalized eigenfunctions are associated to the Jordan block in the complex energy representation. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Univ Sonora, Dept Fis, Hermosillo, Sonora, Mexico. RP Hernandez, E, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR ANTONIOU IE, 1998, J MATH PHYS, V39, P2459 BASKOV LM, 1985, NUCL PHYS B, V256, P365 BERGGREN T, 1968, NUCL PHYS A, V109, P265 BERGGREN T, 1996, PHYS LETT B, V373, P1 BOHM A, 1997, J MATH PHYS, V38, P6072 DEMBOWSKI C, 2001, PHYS REV LETT, V86, P787 HERNANDEZ E, 1992, REV MEX FIS, V38, P128 HERNANDEZ E, 1994, PHYS LETT B, V326, P1 HERNANDEZ E, 2000, J PHYS A-MATH GEN, V33, P4507 HINTERBERGER F, 1978, NUCL PHYS A, V299, P397 JACOBSON N, 1953, LECT NOTES ABSTR ALB, V2, CH3 KATO T, 1980, PERTURBATION THEORY KYLSTRA NJ, 1998, PHYS REV A, V57, P412 LANCASTER P, 1985, THEORY MATRICES LATINNE O, 1995, PHYS REV LETT, V74, P46 MAGUNOV AI, 2001, J PHYS B-AT MOL OPT, V34, P29 MONDRAGON A, 1996, J PHYS A-MATH GEN, V29, P2567 MONDRAGON A, 1998, LECT NOTE PHYS, V504, P257 NEWTON RG, 1982, SCATTERING THEORY WA, CH12 PONT M, 1992, PHYS REV A, V46, P555 VANROOSE W, 1997, J PHYS A-MATH GEN, V30, P5543 VANROOSE W, 2001, PHYS REV A, V64 VONBRENTANO P, 1994, Z PHYS A HADRON NUCL, V348, P41 VONBRENTANO P, 1996, PHYS REP, V264, P57 VONBRENTANO P, 2002, IN PRESS PHYS LETT B VONBRENTANO P, 2002, IN PRESS REV MEX FIS, V48 ZELDOVICH YB, 1960, ZH EKSP TEOR FIZ, V39, P776 ZELDOVICH YB, 1961, SOV PHYS JETP, V12, P642 NR 28 TC 1 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 6 EP 17 PG 12 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800003 ER PT J AU Moshinsky, M Riquer, VA TI The non-relativistic energy spectra of quark-antiquark systems SO REVISTA MEXICANA DE FISICA LA English DT Article DE non-relativistic; quark-antiquark ID CHARMONIUM AB In the Taxco Nuclear Physics Conference (January 7-10, 2002) we presented a Lorentz invariant formulation of the two body problem with spin and arbitrary central interaction. We Specified the solution, starting from the non-relativistic problems, to. order 1/c(2). In view of the length of this presentation we restrict ourselves in this paper to the non-relativistic case using. one of the well known potentials. As the problem has no analytic solution we use a Rayleigh-Ritz variational procedure with a basis of Sturm-Coulomb radial functions that are not orthonormal. We derive the matrix representation of the problem with a modification that allows the determination of the eigenvalues, through the diagonalization of this matrix. We apply the analysis to discuss the spectra of bottomonium. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. RP Moshinsky, M, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR BRAMBILLA N, 1999, HEPPH9904330 EICHTEN E, 1978, PHYS REV D, V17, P3090 EICHTEN E, 1980, PHYS REV D, V21, P203 GROOM DE, 2000, EUR PHYS J C, V15, P385 LUCHA W, 1991, PHYS REP, V200 MOSHINSKY M, 1993, FOUND PHYS, V23, P197 MOSHINSKY M, 1996, HARMONIC OSCILLATOR MOSHINSKY M, 2000, REV MEX FIS S1, V46, P1 RIQUER V, 2002, THESIS MEXICO NR 9 TC 1 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 37 EP 40 PG 4 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800006 ER PT J AU Jesgarz, S Lerma, S Hess, PO Civitarese, O Reboiro, M TI A schematic model for QCD at finite temperature: the first steps SO REVISTA MEXICANA DE FISICA LA English DT Article DE QCD; effective model; Lipkin; quark-gluon plasma ID RELATIVISTIC QUARK-MODEL; STRANGE-BARYON SPECTRUM; PHASE-TRANSITION; LIPKIN MODEL; STATES; FORCES; APPROXIMATION AB A schematic, Lipkin-type model for non-perturbative QCD is introduced. The general structure of the model is discussed briefly. To illustrate the scope, the model is restricted to its simplest version. The energy spectrum in the normal (low interaction strength) and deformed (high interaction strength) phases is discussed. Finite Temperature effects are discussed for the case of the simplify model. The partition function, the energy density and the heat capacity are calculated by using coherent states. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Univ Nacl La Plata, Dept Fis, RA-1900 La Plata, Argentina. RP Jesgarz, S, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico. CR BALI GS, 1993, PHYS LETT B, V309, P378 CHODOS A, 1974, PHYS REV D, V9, P3471 CIVITARESE O, 2001, PHYS REV C, V64 DRAAYER JP, 1973, J MATH PHYS, V14, P1904 GRADSTEIN IS, 1980, TABLES SERIES INTEGR GREINER W, 1994, THERMODYNAMICS STAT HECHT KT, 1987, LECT NOTES PHYSICS, V290 HESS PO, 1999, EUR PHYS J C, V9, P121 HIRSCH JG, 1999, PHYS REV C, V60 KLEIN A, 1991, REV MOD PHYS, V63, P375 KURIYAMA A, 1995, PROG THEOR PHYS, V94, P1039 KURIYAMA A, 1996, PROG THEOR PHYS, V95, P339 LERMA S, 2002, IN PRESS PHYS REV C LIPKIN HJ, 1965, NUCL PHYS A, V62, P118 LORING U, 2001, EUR PHYS J A, V10, P309 LORING U, 2001, EUR PHYS J A, V10, P395 LORING U, 2001, EUR PHYS J A, V10, P447 PAGE PR, 1999, PHYS REV D, V59, P34016 ROTHE HJ, 1992, LATTICE GAUGE THEORI SCHUTTE D, 1977, NUCL PHYS A, V282, P518 STEPHENS CR, 1997, PHYS LETT B, V414, P333 STEPHENS CR, 2000, INT J MOD PHYS A, V15, P1773 SWANSON ES, 1997, PHYS REV D, V56, P5692 SWANSON ES, 1999, PHYS REV D, V59 SZCZEPANIAK A, 1996, PHYS REV LETT, V76, P2011 WEBER A, 2001, INT J MOD PHYS A, V16, P4377 NR 26 TC 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 41 EP 48 PG 8 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800007 ER PT J AU Ayala, A Cuautle, E Herrera, G Montano, LM TI Quark-Gluon plasma formation and Lambda(0) polarization in ultra-relativistic heavy-ion collisions SO REVISTA MEXICANA DE FISICA LA English DT Article DE quark gluon plasma; ultrarelativistic heavy-ion ID INCLUSIVE HADRON-PRODUCTION; SCATTERING; PROTONS; NUCLEON AB We calculate and compare the polarization of Lambda(0)'s produced in ultra-relativistic heavy-ion and proton-proton collisions as a signature for the production of Quark Gluon Plasma. Lambda(0)'s produced in heavy-ions come from two different regions characterized by different densities of participants within the interaction zone. In the first one, where the density of participants is larger than a certain critical density, quarks are free and coalesce to produce unpolarized Lambda(0)'s. In the second zone, where the density is below a certain critical density, Lambda(0)'s are produced by a recombination mechanism and are therefore polarized. We also discuss possible depolarization effects arising from multiple scattering of Lambda(0)'s within nuclear matter. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Ctr Invest & Estudios Avanzados, Mexico City 07300, DF, Mexico. RP Ayala, A, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico. CR AJIMURA S, 1992, PHYS REV LETT, V68, P2137 ANGERT N, 1982, P C QUARK MATT FORM, P557 ANJOS JC, 1997, PHYS REV D, V56, P394 AYALA A, 2002, PHYS REV C, V65 BELLWEID R, 2002, NUCL PHYS A, V698, P499 BLAIZOT JP, 1996, PHYS REV LETT, V77, P1703 BUNCE G, 1976, PHYS REV LETT, V36, P1113 BYSTRICKY J, 1978, J PHYSIQUE, V39, P1 CONZETT HE, 1993, PHYS REV C, V48, P924 CSERNAI LP, 1984, PHYS REV D, V29, P2664 DEGRAND T, 1988, PHYS REV D, V38, P403 DEGRAND TA, 1981, PHYS REV D, V23, P1227 DEGRAND TA, 1981, PHYS REV D, V24, P2419 FUJITA T, 1988, PHYS REV D, V38, P401 HEINZ UW, 1999, P C STRONG EL MATT S, P81 HERRERA G, 1996, PHYS LETT B, V382, P201 HERRERA G, 1997, REV MEX FIS S1, V43, P29 HUFNER J, 1984, PHYS LETT B, V145, P167 HWA RC, 1984, PHYS REV LETT, V52, P492 LETESSIER J, 1996, PHYS LETT B, V389, P586 MAY M, 1981, PHYS REV LETT, V47, P1106 MAY M, 1997, PHYS REV LETT, V78, P4343 MILLENER DJ, 1985, PHYS REV C, V31, P499 MONTANO LM, 1996, PHYS LETT B, V381, P337 PANAGIOTOU AD, 1990, INT J MOD PHYS A, V5, P1197 RANFT J, 1979, ACT PHYS POL B, V10, P911 TANIDA K, 2001, NUCL PHYS A, V684, C560 USCINSKI BJ, 1977, ELEMENTS WAVE PROPAG NR 28 TC 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 49 EP 54 PG 6 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800008 ER PT J AU Velazquez, V Zuker, AP TI Quadrupole coherence with displaced random ensembles SO REVISTA MEXICANA DE FISICA LA English DT Article DE displaced random ensamble; rotational spectra ID NUCLEI AB Displaced two body random ensembles are built with numbers extracted from normal distributions whose peaks are centered off zero (DT-BRE). Exact diagonizations in the f(tau/2)p(3/2) space show the evolution of the ratio R = E4+/E2+ and B(E2) values of even-even nuclei for different displaced centroids. We find that displaced (attractive) random ensembles lead to rotational spectra with strongly enhanced B(E2) transitions. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Univ Strasbourg 1, CNRS, IN2P3, IRES, F-67037 Strasbourg 2, France. RP Velazquez, V, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico. CR BIJKER R, 2000, PHYS REV C, V62 BIJKER R, 2000, PHYS REV LETT, V84, P420 BRODY TA, 1981, REV MOD PHYS, V53, P385 CORTES A, 1982, PHYS LETT B, V115, P1 DUFOUR M, 1996, PHYS REV C, V54, P1641 JIANG MF, 1992, PHYS REV C, V46, P910 JOHNSON CW, 1998, PHYS REV LETT, V80, P2749 JOHNSON CW, 1999, PHYS REV C, V61 KANAHA S, 1969, PHSY REV, V180, P1641 KANAHA S, 1969, PHSY REV, V185, P1378 POVES A, 1981, PHYS REP, V70, P235 VELAZQUEZ V, 2002, PHYS REV LETT, V88 ZAMFIR NV, 1994, PHYS REV LETT, V72, P3480 ZUKER AP, 1995, PHYS REV C, V52, R1741 NR 14 TC 1 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 83 EP 86 PG 4 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800014 ER PT J AU Hirsch, JG TI Double beta decay and neutrino masses SO REVISTA MEXICANA DE FISICA LA English DT Article DE double beta decay; neutrino masses ID HEAVY DEFORMED-NUCLEI; SHELL-MODEL DESCRIPTION; LOW-ENERGY STRUCTURE; NORMAL PARITY BANDS; EXCITED-STATES; GD-160; SCHEME; B-8 AB The flux of solar and atmospheric neutrinos has been measured With increasing precision, and offers now direct evidence of the presence of neutrino oscillations between different neutrino flavors. The neutrinoless double beta decay, if detected, would provide the complementary information needed to determine neutrino masses, and would also offer definitive evidence that the neutrino-is a Majorana particle. A review is presented on the ongoing and future double-beta-decay experiments, the challenges, still present in the calculation of double-beta-deca nuclear matrix elements, and of recent improvements based on the pseudo-SU(3). shell model. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RP Hirsch, JG, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico. CR AALSETH CE, HEPEX0202018 AALSETH CE, IN PRESS MOD PHYS A AHMAD QR, 2001, PHYS REV LETT, V87 ARIMA A, 1969, PHYS LETT B, V30, P517 BAHCALL JN, 2001, J HIGH ENERGY PHYS BAHCALL JN, 2001, J HIGH ENERGY PHYS BARABASH AS, 2001, IN PRESS CZECH J PHY BEUSCHEL T, 1998, PHYS REV C, V57, P1233 BEUSCHEL T, 2000, PHYS REV C, V61 BURACHAS SF, 1995, PHYS ATOM NUCL+, V58, P153 CASTANOS O, 1987, ANN PHYS, V180, P290 CASTANOS O, 1993, REV MEX FIS, V39, P29 CASTANOS O, 1994, NUCL PHYS A, V571, P276 CAURIER E, 1996, PHYS REV LETT, V77, P1954 CZAKON M, HEPPH0110166 DANEVICH FA, 2001, NUCL PHYS A, V694, P375 DOI M, 1985, PROG THEOR PHYS SUPP, V83, P1 DRAAYER JP, 1984, ANN PHYS-NEW YORK, V156, P41 ELLIOTT SR, 1993, NUCL PHYS B S, V31, P68 FAESSLER A, 1988, PROG PART NUCL PHYS, V21, P183 FUKUDA S, 2001, PHYS REV LETT, V86, P5651 HECHT KT, 1969, NUCL PHYS A, V137, P129 HIRSCH JG, ARXIVNUCLTH0110022 HIRSCH JG, 1995, NUCL PHYS A, V582, P124 HIRSCH JG, 1995, NUCL PHYS A, V589, P445 HIRSCH JG, 1995, PHYS REV C, V51, P2252 HIRSCH JG, 1995, REV MEX FIS S1, V41, P81 HIRSCH JG, 2002, CZECH J PHYS, V52, P513 HIRSCH JG, 2002, PHYS LETT B, V534, P57 HIRSCH JG, 2002, PHYS REV C, V66 KIRPICHNIKOV IV, 2000, PHYS ATOM NUCL+, V63, P1417 KLAPDORKLEINGRO.HV, HEPPH0103076 KLAPDORKLEINGROTHAUS HV, 2001, EUR PHYS J A, V12, P147 KLAPDORKLEINGROTHAUS HV, 2001, MOD PHYS LETT A, V16, P2409 KLAPDORKLEINGROTHAUS HV, 2001, PHYS REV D, V63 KOBAYASHI M, 1995, NUCL PHYS A, V586, P457 MOE M, 1994, ANNU REV NUCL PART S, V44, P247 MOE MK, 1993, INT J MOD PHYS E, V2, P807 MORALES A, 1999, NUCL PHYS B-PROC SUP, V77, P335 NAKADA H, 1996, NUCL PHYS A, V607, P235 PIEPKE A, 1994, NUCL PHYS A, V577, P493 POPA G, 2000, PHYS REV C, V62 RADHA PB, 1996, PHYS REV LETT, V76, P2642 RAJU RDR, 1973, NUCL PHYS A, V202, P433 ROMPF D, 1998, PHYS REV C, V57, P1703 STAUDT A, 1990, EUROPHYS LETT, V13, P31 SUHONEN J, 1998, PHYS REP, V300, P123 TOMODA T, 1991, REP PROG PHYS, V54, P53 VARGAS C, 2000, PHYS REV C, V61 VARGAS CE, 2000, NUCL PHYS A, V673, P219 VARGAS CE, 2001, NUCL PHYS A, V690, P409 VERGADOS JD, 1986, PHYS REP, V111, P1 NR 52 TC 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 87 EP 92 PG 6 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800015 ER PT J AU Padilla, E Galindo-Uribarri, A Castanos, O Baktash, C Batchelder, JC Bijker, R Fuentes, B Gross, CJ Hartley, DJ Hausladen, PA Mueller, PE Radford, DC Stracener, DW Yu, CH TI Studies of nuclei far from stability in the regions A=80 and A=130 SO REVISTA MEXICANA DE FISICA LA English DT Article DE radioactive beams; nuclear structure; proton drip line ID TRANSITION; SPECTROSCOPY; STATES; PROTON; ND-130; BAND AB Recent developments in experimental techniques have enabled the study of nuclei far from the line of stability in both the proton- and the neutron-rich sides. This work is divided in two parts. In the first part we report the identification of gamma-rays in the near proton-drip line nuclei Pm-130 and Pm-132. In the second part, preliminary results of a systematic measurement of B(E2; 0(+) --> 2(+)) using novel CoulombExcitation techniques are presented for even-even isotopes of Ge and Se. The difficulties and challenges that represent the determination of the B(E2) values for the exotic neutron-rich nuclei Ge-78 and Ge-80 are discussed. The measurement of these radioactive isotopes was possible thanks to the recent availability of radioactive ion beams at the Holifield Radioactive Ion Beam Facility. A comparison between the measured B(E2) values and theoretical predictions obtained with the IBA2 model is also presented. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. Univ Nacl Autonoma Mexico, Fac Ciencias, Mexico City 04510, DF, Mexico. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RP Padilla, E, Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. CR ADLER K, 1975, ELECTROMAGNETIC EXCI ARIMA A, 1977, PHYS LETT B, V66, P205 CHOU WT, 1993, PHYS REV C, V47, P157 DUVAL PD, 1981, PHYS LETT B, V100, P223 DUVAL PD, 1983, PHYS LETT B, V124, P297 GALINDOURIBARRI A, 1999, REV MEX FIS S2, V45, P55 GINTER T, 2000, THESIS VANDERBILT U GROSS CJ, 2000, NUCL INSTRUM METH A, V450, P12 HARTLEY DJ, 2001, PHYS REV C, V63 HARTLEY DJ, 2001, PHYS REV C, V63 KOTA VKB, 1982, PHYS REV C, V25, P1667 LEANDER GA, 1982, PHYS LETT B, V110, P17 LECOMTE R, 1977, NUCL PHYS A, V284, P123 LECOMTE R, 1980, PHYS REV C, V22, P1530 LECOMTE R, 1980, PHYS REV C, V22, P2420 LECOMTE R, 1982, PHYS REV C, V25, P2812 LOPEZMORENO E, 1996, REV MEX FIS S1, V42, P163 OTSUKA T, COMPUTER CODES NPBOS PARRY CM, 1998, PHYS REV C, V57, P2215 PAUL ES, 1998, PHYS REV C, V58, P801 RADFORD DC, 2002, PHYS REV LETT, V88 RAMAN S, 2001, ATOM DATA NUCL DATA, V78, P1 SCHOLTEN O, 1980, THESIS U GRONINGEN STRACENER DW, 2001, APPL ACC RES IND 16, P257 WADSWORTH R, 1986, 1985 1986 ANN REPT, P103 WADSWORTH R, 1989, Z PHYS A ATOMS NUCL, V333, P411 WILMARTH PA, 1985, Z PHYS A ATOMS NUCL, V321, P179 YUANXIANG X, 1999, EUR PHYS J A, V5, P341 ZEIDAN O, 2002, PHYS REV C, V65 NR 29 TC 1 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 93 EP 97 PG 5 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800016 ER PT J AU Chavez, E Barron, L Beene, JR Uribarri, AG del Campo, JG Gross, CJ Halbert, ML de la P, LH Huerta, A Ibanes, A Liang, JF Macias, R Moreno, E Murillo, G Ortiz, ME Paul, SD Policroniades, R Stracener, DW Shapira, D Varela, A Varner, RL TI The simultaneous emission of two nucleons, an understanding and new predictions SO REVISTA MEXICANA DE FISICA LA English DT Article DE two proton emission; simultaneity ID 2-PROTON EMISSION; RESONANCE; DECAY; STATE; NE-18 AB After a long standing search of over 40 years [1], the simultaneous emission of two protons was discovered [2, 3]. An excited state. in a light nuclei (Ne-18), not a ground state, was identified as the first state to have such decay property. In this work, we review that discovery, discuss the concept of simultaneity and propose a simple analysis in terms of the shell structure of the nuclei involved. The analysis is generalized to all closed shells up to Ca-48. It is predicted that no other nuclear state near closed shells, can decay by a pure simultaneous emission of two protons. The same analysis applied to the case of the simultaneous emission of two neutrons yielded the prediction of two sets of states in C-14 and O-18 with such property. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Inst Nacl Invest Nucl, Dept Acelerador, Salazar 52045, Edo Mexico, Mexico. RP Chavez, E, Univ Nacl Autonoma Mexico, Inst Fis, POB 20-364,Del A Obregon, Mexico City 01000, DF, Mexico. CR BAIN CR, 1996, PHYS LETT B, V373, P35 BARDAYAN DW, 1999, PHYS REV LETT, V83, P45 BORREL V, 1987, NUCL PHYS A, V473, P331 CHU SY, 1999, ISOTOPE EXPLORER 2 2 DELCAMPO JG, 2001, PHYS REV LETT, V86, P43 DETRAZ C, 1990, NUCL PHYS A, V519, P529 GALINDOURIBARRI A, 2000, NUCL INSTRUM METH B, V172, P647 GALONSKY A, 1996, NUCL PHYS A, V599, C353 GEESAMAN DF, 1977, PHYS REV C, V15, P1835 GOLDANSKII VI, 1960, NUCLEAR PHYSCIS, V19, P482 HERNANDEZ AH, 1998, NUCL INSTRUM METH B, V143, P569 KRYGER RA, 1995, PHYS REV LETT, V74, P860 MOLTZ DM, 1992, Z PHYS A-HADRON NUCL, V342, P273 MORENO E, 2001, ISOL 2001 C OAK RIDG URIBARRI AG, 2001, NUCL PHYS A, V682, C363 NR 15 TC 1 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 98 EP 102 PG 5 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800017 ER PT J AU Belyaeva, TL Zelenskaya, NS TI Study of quasimolecular states in Mg-24 via d-alpha angular correlation analysis in the C-12(N-14, d)Mg-24*(alpha)Ne-20 reaction SO REVISTA MEXICANA DE FISICA LA English DT Article DE angular correlation functions; quasimolecular structure ID CLUSTER; C-12+C-12 AB The methods of calculating the angular correlation functions in the reactions induced by light and semiheavy ions of energy up to 10 MeV/nucleoi have been discussed. The differential cross sections and alpha-d angular correlation functions in the reaction C-12 (N-14, d) Mg-24* (alpha) Ne-20 involving high-lying states in Mg-24 at N-14 beam energies E-lab = 29-45 MeV in the model of direct C-12 transfer the framework of the distort-wave method with finite interaction range and the statistical compound-nucleus model have been analyzed. The reduced width amplitudes for the high-excited, states in Mg-24 with (12)Ccircle times(12)C quasimolecular structure are-extracted and the influence of relative motion of C-12+C-12* are studied. C1 Univ Autonoma Estado Mexico, Toluca 50000, Mexico. Moscow MV Lomonosov State Univ, DV Skobeltsyn Inst Nucl Phys, Moscow 119899, Russia. RP Belyaeva, TL, Univ Autonoma Estado Mexico, Toluca 50000, Mexico. CR ARTEMOV KP, 1984, PHYS LETT B, V149, P325 ARTEMOV KR, 1986, SOV J NUCL PHYS, V44, P373 AUSTERN N, 1964, PHYS REV B, V136, P1743 BALASHOV VV, 1959, SOV PHYS JETP, V37, P1385 BALASHOV VV, 1964, NUCL PHYS, V59, P417 BELOTE TA, 1973, PHYS REV LETT, V30, P450 BELYAEVA TL, 1988, B ACAD SCI USSR PHYS, V52, P105 BELYAEVA TL, 1992, COMPUT PHYS COMMUN, V73, P161 BELYAEVA TL, 1994, IZV AKAD NAUK FIZ, V58, P112 BELYAEVA TL, 1998, PHYS PART NUCLEI, V29, P107 BELYAEVA TL, 2002, PHYS REV C, V66 BEREGI P, 1965, NUCL PHYS, V66, P513 BETTS RR, 1997, REP PROG PHYS, V60, P819 BIEDENHARN LC, 1953, REV MOD PHYS, V25, P729 BIEDENHARN LC, 1960, NUCL SPECTROSCOPY B, P732 BOGDANOVA NA, 1990, SOV J NUCL PHYS, V51, P631 BOGDANOVA NA, 1990, YAF, V51, P986 BOYARKINA AN, 1973, STRUCTURE P SHELL NU BROMLEY DA, 1960, PHYS REV LETT, V4, P365 CURTIS N, 1995, PHYS REV C, V51, P1554 DESHALIT A, 1963, NUCL SHELL THEORY FREER M, 2001, PHYS REV C, V63 GOLDFARB LJB, 1959, NUCL REACTIONS, V1, P159 HANSON DL, 1974, PHYS REV C, V9, P929 IGO G, 1963, PHYS REV, V131, P337 KLAPDOR HV, 1975, NUCL PHYS A, V244, P157 KLAPDOR HV, 1976, NUCL PHYS A, V262, P157 MARQUARDT N, 1971, PHYS LETT B, V35, P37 MOSHINSKY M, 1968, GROUP THEORY MANY BO MOSHINSKY M, 1969, HARMONIC OSCILATOR M NAGATANI K, 1971, PHYS REV LETT, V27, P1071 NEUDATCHIN VG, 1969, NUCLEON ASS LIGHT NU PATE SF, 1988, PHYS REV C, V37, P1953 SAINI S, 1987, PHYS LETT B, V185, P316 SAKHARUK AA, 1997, PHYS REV C, V55, P302 SAKHARUK AA, 1998, PHYS REV C, V60 SAKUTA SB, 1999, PHYS ATOM NUCL+, V62, P1873 SMIRNOV YF, 1961, NUCL PHYS, V26, P306 VOLANT C, 1975, NUCL PHYS A, V238, P120 WUOSMAA AH, 1995, ANNU REV NUCL PART S, V45, P1 ZELENSKAYA NS, 1980, IZV AN SSSR FIZ, V44, P960 ZELENSKAYA NS, 1980, SOV J PART NUCL, V11, P126 ZELENSKAYA NS, 1985, EXCHANGE PROCESSES N ZELENSKAYA NS, 1995, CHARACTERISTICS EXCI ZURMUHLE RW, 1994, PHYS REV C, V49, P2549 NR 45 TC 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD NOV PY 2002 VL 48 SU Suppl. 2 BP 108 EP 116 PG 9 SC Physics, Multidisciplinary GA 621DT UT ISI:000179573800019 ER PT J AU Galvan, L Jauregui-Renaud, K Marquez, MF Hermosillo, AG Cardenas, M TI Effect of angiotensin blockade on the orthostatic response in patients with systemic arterial hypertension SO REVISTA ESPANOLA DE CARDIOLOGIA LA Spanish DT Article DE orthostatic response; systemic arterial hypertension; angiotensin inhibition ID HEART-RATE-VARIABILITY; RESPIRATORY SINUS ARRHYTHMIA; CONVERTING ENZYME-INHIBITORS; BAROREFLEX SENSITIVITY; BLOOD-PRESSURE; SPECTRAL-ANALYSIS; SHORT-TERM; DISEASE; MODULATION; INTERVAL AB Introduction and objectives. The effect of the treatment of arterial hypertension with angiotensin inhibitors on the autonomic response to orthostatism was studied. Patients and method. In 20 hypertensive patients, enalapril (10 to 20 mg) was administered daily for four weeks. Then, irbesartan (150 to 300 mg) was given for four weeks. Finally, 10 mg of enalapril combined with 150 mg of irbesartan was prescribed for another four weeks. Heart rate variability at rest and during the head-up tilt test with controlled respiration was assessed at the beginning and end of each period. Results. Mean arterial pressure showed a similar reduction in the three treatment periods. There were no changes in heart rate. Heart rate variability at rest showed differences in the spectral high-frequency component between the control and the treatment periods (p=0.10). There was an increase in the high-frequency component between the control and the third (p=0.047) and the fourth periods (p=0.03). In the head-up tilt test there was a decrease in total spectral high-frequency power. Conclusions. There was no increase in orthostatic intolerance with these drugs in hypertensive patients. The absence of changes in heart rate in spite of a decrease in blood pressure suggests resetting of the baroreflex function. The long-term control of hypertension with these drugs may have a favorable effect on heart rate variability, with an increase in parasympathetic activity. C1 Inst Nacl Cardiol Ignacio Chavez, Subdirecc Invest Clin, Dept Electrocardiog & Electrofisiol, Tlalpan 14080, DF, Mexico. IMSS, Unidad Invest Med, HG Ctr Med Nacl La Raza, Mexico City, DF, Mexico. RP Cardenas, M, Inst Nacl Cardiol Ignacio Chavez, Subdirecc Invest Clin, Dept Electrocardiog & Electrofisiol, Juan Badiano 1, Tlalpan 14080, DF, Mexico. 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Esp. Cardiol. PD NOV PY 2002 VL 55 IS 11 BP 1137 EP 1142 PG 6 SC Cardiac & Cardiovascular Systems GA 622BP UT ISI:000179626900006 ER PT J AU Abundes, A Rivera, JD Arizmendi, E Farell, J Ledesma, M Montoya, S TI Immediate and long-term results of implantation of the new platinum coronary stent (Atlas stent) in patients with coronary artery disease SO REVISTA ESPANOLA DE CARDIOLOGIA LA Spanish DT Editorial Material DE stent; coronary artery disease; coronary angioplasty ID BALLOON ANGIOPLASTY; PLACEMENT; GRAFTS; TRIAL AB Background and objectives. We evaluated the technical and clinical results of implantation of the Atlas stent, the hospital stay, and the short and long-term clinical and angiographic outcome. Patients and method. The study included 169 patients (60.1+/-10.8 year-old), 60.3% of which had acute coronary syndromes and complex lesions. Immediate success was achieved in 98% of cases. The clinical follow-up in 85.7% of the patients at 14.3+/-6.8 months, revealed that 89% remained free of adverse events and most (94.4%) were functional class I of the CCS. Angiographic followup at 8.4+/-4.1 months of 40.9% of the cases revealed restenosis in 27.9%. There were 2 cases of subacute thrombosis. Conclusions. The application of the Atlas(TM) stent in patients with a diverse clinical spectrum demonstrated good immediate and long term results, with a rate of restenosis similar to that of other stents available on the market. C1 Hosp Cardiol, Ctr Med Nacl SIgloi 21, Inst Mexicano Seguro Social, Mexico City, DF, Mexico. RP Abundes, A, Carracci N 15,Colonia San Juan Mixcoac, Mexico City 03730, DF, Mexico. CR ABUNDES VA, 2001, MULTIPLES FACETAS IN, P71 AMANDA GMR, 2000, AM J CARDIOL, V86, I41 ANDERSON HV, 2000, CIRCULATION, V102, P2910 DESCHEERDER IK, 1999, CATHET CARDIOVASC DI, V42, P339 FISCHMAN DL, 1994, NEW ENGL J MED, V331, P496 FOURNIER JA, 2001, REV ESP CARDIOL, V54, P567 HIJAZI ZM, 1995, J INVASIVE CARDIOL, V7, P127 INIGUEZ A, 2001, REV ESP CARDIOL, V54, P557 KANSU G, 1996, EUR J PROSTHODONT RE, V4, P155 KEANE D, 1994, J INTERV CARDIOL, V7, P333 KIM TS, 1998, INVEST RADIOL, V33, P407 KIMMEL SE, 2001, J AM COLL CARDIOL, V37, P499 PEPINE CJ, 1996, J AM COLL CARDIOL, V28, P782 POMPA JJ, 1992, CIRCULATION S, V86, P321 ROCHASINGH K, 1995, AM J CARDIOL, V75, P26 SAVAGE MP, 1997, NEW ENGL J MED, V337, P740 SERRUYS PW, 1994, NEW ENGL J MED, V331, P489 SIRNES PA, 1996, J AM COLL CARDIOL, V28, P1444 TAMBURINO FR, 1998, CARDIOLOGIA, V43, P725 VELASCO AA, 1998, ARCH I CARDIOL MEX, V68, P370 VELASCO AA, 2000, ARCH I CARDIOL MEX, V70, P377 VENUGOPALAN R, 1999, J BIOMED MATER RES, V48, P829 WITHE CJ, 1997, CATHET CARDIOVASC DI, V41, P1 NR 23 TC 0 PU EDICIONES DOYMA S/L PI BARCELONA PA TRAV DE GRACIA 17-21, 08021 BARCELONA, SPAIN SN 0300-8932 J9 REV ESPAN CARDIOL JI Rev. Esp. Cardiol. PD NOV PY 2002 VL 55 IS 11 BP 1205 EP 1208 PG 4 SC Cardiac & Cardiovascular Systems GA 622BP UT ISI:000179626900014 ER PT J AU Gonzalez-Amaro, R Sanchez-Madrid, F TI Intercellular adhesion molecules and chemotaxic factors in the pathogenesis of multiple sclerosis SO REVISTA DE NEUROLOGIA LA Spanish DT Article DE chemokines; inflammation; integrins; lymphocytes ID EXPERIMENTAL AUTOIMMUNE ENCEPHALOMYELITIS; EXPERIMENTAL ALLERGIC ENCEPHALOMYELITIS; CENTRAL-NERVOUS-SYSTEM; MACROPHAGE INFLAMMATORY PROTEIN-1-ALPHA; MICROVASCULAR ENDOTHELIAL-CELLS; CHEMOKINE-RECEPTOR EXPRESSION; TYROSINE KINASE INHIBITOR; NECROSIS-FACTOR RECEPTOR; BLOOD-BRAIN-BARRIER; L-SELECTIN AB Introduction. Multiple sclerosis (MS) is an inflammatory immune disorder of the central nervous system characterized by the destruction of myelin sheaths and the cells which make them, the oligodendrocytes. Experimental allergic encephalitis (EAE) is an autoimmune condition mainly induced by the myelin basic protein (MBP) that is a very useful model for the study of demyelinating inflammatory diseases, particularly MS. Method. Cellular adhesion molecules are a wide group of membrane receptors which mediate adhesion processes, both cell-to-cell and between cells and the extracellular matrix. These molecules play an essential role in inflammatory phenomena, including EAE/MS Integrins of the beta(1) subfamily (mainly alpha(4)beta(1)), as well as leukocyte integrins and adhesion receptors of the immunoglobulin superfamily (ICAM-1, VCAM-1) are the main molecules involved. Chemokines also have an important role in MS, since they are able to attract and activate leukocytes, essential phenomena in the inflammatory reaction. An increased expression of chemokines CC or beta (e.g., RANTES, MIP-1alpha and beta, MCP-1, etc) has been found in EAE/MS, and it is very likely that they are involved in the migration of lymphocytes and monocytes towards the MS inflammatory lesions. Conclusion. The pharmacological blockade of adhesion molecules and chemokines is a promising and novel therapeutic approach in MS. C1 Univ Autonoma San Luis Potosi, Fac Med, Dept Immunol, Mexico City, DF, Mexico. Univ Autonoma Madrid, Hosp Univ Princesa, Serv Immunol, Madrid, Spain. CR ALVORD EC, 1984, EXPT ALLERGIC ENCEPH ANDERSON DC, 1987, ANNU REV MED, V38, P175 ANDJELKOVIC AV, 2000, J LEUKOCYTE BIOL, V68, P545 APLIN AE, 1998, PHARMACOL REV, V50, P199 ARCHELOS JJ, 1993, ANN NEUROL, V34, P145 ARCHELOS JJ, 1998, J NEUROL SCI, V159, P127 BAGGIOLINI M, 1997, ANNU REV IMMUNOL, V15, P675 BARCELLOS LF, 2000, IMMUNOGENETICS, V51, P281 BO L, 1996, J NEUROPATH EXP NEUR, V55, P1060 BOVEN LA, 2000, CLIN EXP IMMUNOL, V122, P257 BROCKE S, 1999, P NATL ACAD SCI USA, V96, P6896 CANELLA B, 1993, J NEUROIMMUNOL, V46, P43 CHAPMAN GA, 2000, EUR J PHARMACOL, V392, P189 CONSTANTIN G, 1998, EUR J IMMUNOL, V28, P3523 CONSTANTIN G, 1999, J IMMUNOL, V162, P1144 CORBI AL, 1996, LEUKOCYTE INTEGRINS COUGHLAN CM, 2000, NEUROSCIENCE, V97, P591 DECARVALHO MCA, 1999, BRAZ J MED BIOL RES, V32, P583 DEFAZIO G, 2000, BRAIN RES, V863, P245 DOPP JM, 1994, J NEUROIMMUNOL, V54, P129 ENGELHARDT B, 1997, BLOOD, V90, P4459 ENGELHARDT B, 1998, J CLIN INVEST, V102, P2096 FERNANDEZ O, 2000, MED INTERNA, P1652 FISCHER FR, 2000, J NEUROIMMUNOL, V110, P195 FOLCIK VA, 1999, J NEUROIMMUNOL, V97, P119 GODISKA R, 1995, J NEUROIMMUNOL, V58, P167 GONZALEZAMARO R, 1998, DRUGS, V56, P977 GONZALEZAMARO R, 1998, J IMMUNOL, V161, P65 GONZALEZAMARO R, 1999, CRIT REV IMMUNOL, V19, P389 GONZALEZAMARO R, 2001, IN PRESS EXPERT OPIN HARTUNG HP, 1993, NEUROLOGY, V43, P2331 HARTUNG HP, 1995, ANN NEUROL, V38, P186 HASKARD DO, 1995, CURR OPIN RHEUMATOL, V7, P229 HASKELL CA, 1999, J BIOL CHEM, V274, P10053 HUITINGA I, 1993, EUR J IMMUNOL, V23, P709 HYDUK SJ, 1998, J NEUROPATH EXP NEUR, V57, P602 IARLORI C, 2000, J NEUROIMMUNOL, V107, P100 IZIKSON L, 2000, J EXP MED, V192, P1075 JUNG S, 1995, EUR J IMMUNOL, V25, P1391 KANWAR JR, 2000, J NEUROIMMUNOL, V103, P146 KARPUS WJ, 1998, J IMMUNOL, V161, P2667 KARSAN A, 1998, J CLIN INVEST, V101, P2438 KAWAI K, 1996, CELL IMMUNOL, V171, P262 KENT SJ, 1995, J NEUROIMMUNOL, V58, P1 KESZTHELYI E, 1996, NEUROLOGY, V47, P1053 KOBAYASHI Y, 1995, CELL IMMUNOL, V164, P295 KORNER H, 1995, P NATL ACAD SCI USA, V92, P11066 LASCHINGER M, 2000, J NEUROIMMUNOL, V102, P32 LEGER OJ, 1997, HUMAN ANTIBODIES, V8, P3 LIANG M, 2000, J BIOL CHEM, V275, P19000 LIU MT, 2000, J IMMUNOL, V165, P2327 LUO Y, 2000, J IMMUNOL, V165, P4015 MARTIN R, 1992, ANNU REV IMMUNOL, V10, P153 MCMANUS CM, 2000, AM J PATHOL, V156, P1441 MEUCCI O, 2000, P NATL ACAD SCI USA, V97, P8075 MOSMANN TR, 1989, ANNU REV IMMUNOL, V7, P145 MOSSNER R, 1996, ACTA NEUROL SCAND, V93, P118 MOSSNER R, 1996, J NEUROIMMUNOL, V65, P61 MURPHY PM, 1994, ANNU REV IMMUNOL, V12, P593 NATAF S, 1993, ACTA NEUROL SCAND, V88, P97 OKUDA Y, 2000, BIOCHEM BIOPH RES CO, V275, P164 OTTO VI, 2000, J NEUROSCI RES, V60, P733 PAN Y, 1997, NATURE, V387, P611 PATERSON PY, 1960, J EXP MED, V111, P119 PETTE M, 1997, NEUROLOGY, V49, P385 POSTIGO AA, 1993, RES IMMUNOL, V144, P723 PREVITALI SC, 1997, AM J PATHOL, V151, P1425 PRINEAS JW, 1985, HDB CLIN NEUROLOGY, P213 RANSOHOFF RM, 2000, EXPERT OPIN INV DRUG, V9, P1079 RIECKMANN P, 1997, ANN NEUROL, V41, P326 ROSE LM, 1997, MULT SCLER, V2, P259 ROSSI D, 2000, ANNU REV IMMUNOL, V18, P217 ROTTMAN JB, 2000, EUR J IMMUNOL, V30, P2372 SALLUSTO F, 2000, ANNU REV IMMUNOL, V18, P593 SCHALL TJ, 1994, CURR OPIN IMMUNOL, V6, P865 SIMPSON J, 2000, J NEUROIMMUNOL, V108, P192 SIMPSON JE, 2000, NEUROPATH APPL NEURO, V26, P133 SIPKINS DA, 2000, J NEUROIMMUNOL, V104, P1 SOBEL RA, 1990, AM J PATHOL, V136, P1309 SUN JB, 2000, INT IMMUNOL, V12, P1449 TRAN EH, 2000, EUR J IMMUNOL, V30, P1410 TRAUGOTT U, 1983, SCIENCE, V219, P308 TROJANO M, 2000, J NEUROVIROL S2, V6, S47 VANDERVOORN P, 1999, AM J PATHOL, V154, P45 VONANDRIAN UH, 2000, NEW ENGL J MED, V343, P1020 VORA AJ, 1997, MULT SCLER, V3, P171 WEINSHENKER BG, 1996, NEUROL CLIN, V14, P291 WILLENBORG DO, 1993, J NEUROIMMUNOL, V45, P147 WILLIAMS KC, 2000, LAB INVEST, V80, P313 YEDNOCK TA, 1992, NATURE, V356, P63 YOUSSEF S, 1998, J IMMUNOL, V161, P3870 YOUSSEF S, 1999, J AUTOIMMUN, V13, P21 ZANG YCQ, 2000, BRAIN 9, V123, P1874 ZANG YCQ, 2001, J NEUROIMMUNOL, V112, P174 ZHANG GX, 2000, MULT SCLER, V6, P3 ZUJOVIC V, 2000, GLIA, V29, P305 NR 96 TC 0 PU REVISTA DE NEUROLOGIA PI BARCELONA PA C/O CESAR VIGUERA, EDITOR, APDO 94121, 08080 BARCELONA, SPAIN SN 0210-0010 J9 REV NEUROLOGIA JI Rev. Neurologia PD NOV 16 PY 2002 VL 35 IS 10 BP 985 EP 993 PG 9 SC Clinical Neurology GA 619JQ UT ISI:000179473200013 ER PT J AU Zaharik, ML Vallance, BA Puente, JL Gros, P Finlay, BB TI Host-pathogen interactions: Host resistance factor Nramp1 up-regulates the expression of Salmonella pathogenicity island-2 virulence genes SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID III SECRETION SYSTEM; NADPH PHAGOCYTE OXIDASE; NATURAL-RESISTANCE; MACROPHAGE PROTEIN-1; INTRACELLULAR INFECTIONS; ANTIMICROBIAL ACTIONS; IRON TRANSPORT; IN-VITRO; TYPHIMURIUM; IDENTIFICATION AB Nramp1 (Natural resistance-associated macrophage protein-1; also known as Sic11a1) is a host resistance gene that provides protection against several intracellular pathogens, including Salmonella enterica serovar Typhimurium. Little is known about the dynamic interplay that occurs between mammalian host resistance determinants such as Nramp1 and pathogens during infection. To explore these interactions, we examined the effect of Nramp1 on expression of Salmonella typhimurium (STM) virulence factors. We demonstrate that Salmonella pathogenicity island 2 (SP12) is essential for replication of STM in spleens of infected Nramp1(+/+) mice. Furthermore, the presence of Nramp1 in transfected cell lines and congenic knockout mice resulted in the up-regulation of STM SPI2-associated virulence genes critical for intramacrophage survival. This Nramp1-dependent up-regulation of SPI2 was mimicked in vitro by chelation of iron, demonstrating the iron-responsive nature of expression of STM SPI2-associated virulence genes. We propose that acquisition of SPI2 by S. enterica not only enabled this bacterium to become an effective intracellular pathogen but also allowed the bacterium to withstand the effects of macrophage defense mechanisms such as Nramp1 early in the evolution of its pathogenic character. These dynamic Nramp1-pathogen interactions may be essential for regulating the course of an infection. This study demonstrates the presence of a previously undescribed direct influence of a mammalian innate host resistance locus on a pathogen at the genetic level. C1 Univ British Columbia, Dept Biochem & Mol Biol, Vancouver, BC V6T 1Z3, Canada. Univ Nacl Autonoma Mexico, Inst Biotechnol, Dept Mol Microbiol, Cuernavaca 62250, Morelos, Mexico. McGill Univ, Dept Biochem, Montreal, PQ H3G 1Y6, Canada. McGill Univ, Ctr Study Host Resistance, Montreal, PQ H3G 1Y6, Canada. RP Finlay, BB, Univ British Columbia, Biotechnol Lab, Vancouver, BC V6T 1Z3, Canada. CR ATKINSON PGP, 1999, IMMUNOLOGY, V96, P656 BLACKWELL JM, 2001, CELL MICROBIOL, V3, P773 BUMANN D, 2002, MOL MICROBIOL, V43, P1269 CHAKRAVORTTY D, 2002, J EXP MED, V195, P1155 CIRILLO DM, 1998, MOL MICROBIOL, V30, P175 CUELLARMATA P, 2002, J BIOL CHEM, V277, P2258 DAIGLE F, 2001, MOL MICROBIOL, V41, P1211 DEIWICK J, 1999, MOL MICROBIOL, V31, P1759 FORTIN A, 2001, P NATL ACAD SCI USA, V98, P10793 FOSTER JW, 1992, J BACTERIOL, V174, P4317 FREHEL C, 2002, CELL MICROBIOL, V4, P541 GORVEL JP, 2001, MICROBES INFECT, V3, P1299 GOSWAMI T, 2001, BIOCHEM J 3, V354, P511 GOVONI G, 1996, INFECT IMMUN, V64, P2923 GOVONI G, 1998, INFLAMM RES, V47, P277 GOVONI G, 1999, INFECT IMMUN, V67, P2225 GROISMAN EA, 2001, J BACTERIOL, V183, P1835 GRUENHEID S, 2000, CURR OPIN MICROBIOL, V3, P43 HACKAM DJ, 1998, J EXP MED, V188, P351 HENSEL M, 1998, MOL MICROBIOL, V30, P163 JABADO N, 2000, J EXP MED, V192, P1237 JANAKIRAMAN A, 2000, MOL MICROBIOL, V35, P1146 KEHRES DG, 2000, MOL MICROBIOL, V36, P1085 KNODLER LA, 2002, MOL MICROBIOL, V43, P1089 KOOP AH, 1987, GENE, V52, P245 LEE AK, 2000, J BACTERIOL, V182, P771 LUCAS RL, 2000, J BACTERIOL, V182, P1872 MARCUS SL, 2000, MICROBES INFECT, V2, P145 MASTROENI P, 2000, J EXP MED, V192, P237 MULERO V, 2002, BIOCHEM J 1, V363, P89 OCHMAN H, 1996, P NATL ACAD SCI USA, V93, P7800 PFEIFER CG, 1999, INFECT IMMUN, V67, P5690 RUIZALBERT J, 2002, MOL MICROBIOL, V44, P645 SHEA JE, 1996, P NATL ACAD SCI USA, V93, P2593 SHEA JE, 1999, INFECT IMMUN, V67, P213 VALDIVIA RH, 1997, SCIENCE, V277, P2007 VAZQUEZTORRES A, 2000, J EXP MED, V192, P227 VAZQUEZTORRES A, 2000, SCIENCE, V287, P1655 VIDAL S, 1995, J EXP MED, V182, P655 WOSTEN MMSM, 2000, CELL, V103, P113 NR 40 TC 20 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 PROC NAT ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD NOV 26 PY 2002 VL 99 IS 24 BP 15705 EP 15710 PG 6 SC Multidisciplinary Sciences GA 620JJ UT ISI:000179530000081 ER PT J AU Lu, C Han, MH Guevara-Garcia, A Fedoroff, NV TI Mitogen-activated protein kinase signaling in postgermination arrest of development by abscisic acid SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID AGROBACTERIUM-MEDIATED TRANSFORMATION; OXIDATIVE STRESS; MAP KINASE; ARABIDOPSIS-THALIANA; BINDING-PROTEIN; PHOSPHATASE 2C; GUARD-CELLS; PLANTS; TRANSDUCTION; RESPONSES AB Abscisic acid (ABA) mediates plant responses to environmental stress, particularly to water status. During germination, the embryo emerges from dormancy as the ABA concentration declines. Exposure to exogenous ABA during germination arrests development rapidly, but reversibly, enabling seedlings to withstand early water stress without loss of viability. Postgermination proteolytic degradation of the essential AB15 transcription factor is interrupted by perception of an increase in ABA concentration, leading to AB15 accumulation and reactivation of embryonic genes. Making use of the ABA-hypersensitive hyl1 mutant of Arabidopsis, we show that the ABA signal is transmitted to the transcriptional apparatus through mitogenactivated protein kinase signaling. C1 Penn State Univ, Dept Biol, University Pk, PA 16802 USA. Penn State Univ, Life Sci Consortium, University Pk, PA 16802 USA. Delaware Biotechnol Inst, Newark, DE 19711 USA. Penn State Univ, Dept Biochem & Mol Biol, University Pk, PA 16802 USA. Univ Nacl Autonoma Mexico, Inst Biotecnol, Cuernavaca 62271, Morelos, Mexico. RP Fedoroff, NV, Penn State Univ, Dept Biol, University Pk, PA 16802 USA. CR ASAI T, 2002, NATURE, V415, P977 ASSMANN SM, 2001, CURR OPIN PLANT BIOL, V4, P421 BECHTOLD N, 1998, METH MOL B, V82, P259 BEWLEY JD, 1994, SEEDS PHYSL DEV GERM CLOUGH SJ, 1998, PLANT J, V16, P735 FEDOROFF NV, 2002, SCI STKE FINKELSTEIN RR, 2002, PLANT CELL S, V14, S15 GOSTI F, 1999, PLANT CELL, V11, P1897 GRANT JJ, 2000, PLANT J, V24, P569 HETHERINGTON AM, 2001, CELL, V107, P711 HIRT H, 2000, P NATL ACAD SCI USA, V97, P2405 HIRT H, 2000, RES PRO CEL, V27, P1 HUGOUVIEUX V, 2001, CELL, V106, P477 ICHIMURA K, 2000, PLANT J, V24, P655 INGRAM J, 1996, ANNU REV PLANT PHYS, V47, P377 KNETSCH MLW, 1996, PLANT CELL, V8, P1061 KOORNNEEF M, 2002, CURR OPIN PLANT BIOL, V5, P33 KOVTUN Y, 2000, P NATL ACAD SCI USA, V97, P2940 LIGTERINK W, 2001, INT REV CYTOL, V201, P209 LOPEZMOLINA L, 2001, P NATL ACAD SCI USA, V98, P4782 LU C, 2000, PLANT CELL, V12, P2351 MACROBBIE EAC, 1998, PHILOS T ROY SOC B, V353, P1475 MCBRIDE KE, 1990, PLANT MOL BIOL, V14, P269 MERLOT S, 2001, PLANT J, V25, P295 ROCK CD, 1995, PLANT HORMONES PHYSL, P671 SHEEN J, 1998, P NATL ACAD SCI USA, V95, P975 TENA G, 2001, CURR OPIN PLANT BIOL, V4, P392 TSUGEKI R, 1996, PLANT J, V10, P479 XIONG LM, 2001, DEV CELL, V1, P771 YANG YN, 2000, PLANT J, V22, P543 YUASA Y, 2001, PLANT CELL PHYSIOL, V42, P1012 ZHANG SQ, 1997, PLANT CELL, V9, P809 NR 32 TC 31 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 PROC NAT ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD NOV 26 PY 2002 VL 99 IS 24 BP 15812 EP 15817 PG 6 SC Multidisciplinary Sciences GA 620JJ UT ISI:000179530000099 ER PT J AU Drever, MJ TI Unilateral absence of the external oblique muscle with hypoplasia of the rectus abdominis muscle in a patient with Poland syndrome SO PLASTIC AND RECONSTRUCTIVE SURGERY LA English DT Letter C1 William Osler Hlth Ctr, Tijuana, Mexico. Grp Zendo, Tijuana, Mexico. RP Drever, MJ, 135 Queens Plate Dr, Toronto, ON M9W 6V1, Canada. CR COOPER RA, 1990, BRIT J RADIOL, V63, P302 DREVER JM, 1977, PLAST RECONSTR SURG, V59, P343 DREVER JM, 1978, YB SURG, P88 HAZIR T, 1996, J PAKISTAN MED ASS, V46, P482 HURWITZ DJ, 1994, PLAST RECONSTR SURG, V94, P719 POLAND A, 1841, GUYS HOSP REP, V6, P191 WRIGHT AR, 1992, J COMPUT ASSIST TOMO, V16, P442 NR 7 TC 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0032-1052 J9 PLAST RECONSTR SURG JI Plast. Reconstr. Surg. PD DEC PY 2002 VL 110 IS 7 BP 1802 EP 1803 PG 2 SC Surgery GA 621ZW UT ISI:000179622400032 ER PT J AU Trejo-Tapia, G Arias-Castro, C Rodriguez-Mendiola, M TI Influence of the culture medium constituents and inoculum size on the accumulation of blue pigment and cell growth of Lavandula spica SO PLANT CELL TISSUE AND ORGAN CULTURE LA English DT Article DE iron; lavender; nitrate; phosphate; secondary metabolite; sucrose ID SUSPENSION-CULTURES; VERA CELLS; ROSMARINIC ACID; BETA-VULGARIS; CALLUS AB The effects of the concentration of PO43-, NO3-, Fe2+, sucrose and inoculum size on the accumulation of blue pigment and growth of suspension cultures of Lavandula spica D. C. (= L. latifolia Vill.), were studied. The combination of 2.5 mM PO43-, 14.1 mM NO3-, 1 mM Fe2+, 30 g l(-1) sucrose and 10 g l(-1) fresh weight of inoculum, promoted a 7-fold enhancement on the productivity of blue pigment in comparison to the control medium. Among all the culture medium constituents tested, phosphate exerted the highest beneficial effect and Fe2+ showed to be essential for the accumulation of the pigment. High levels of sucrose (60 or 90 g l(-1)) did not stimulate the accumulation of blue pigment. In these conditions, cell growth and cell viability were drastically affected. C1 Inst Politecn Nacl, Ctr Desarrollo Prod Biot, Yautepec 62731, Morelos, Mexico. Inst Tecnol Agropecuario Jalisco, Ctr Invest & Grad Agropecuarios, Tlajomulco De Zuniga 45640, Jalisco, Mexico. RP Trejo-Tapia, G, Inst Politecn Nacl, Ctr Desarrollo Prod Biot, POB 24, Yautepec 62731, Morelos, Mexico. CR BANTHORPE DV, 1985, PHYTOCHEMISTRY, V24, P2677 BOELENS MH, 1986, PEFUM FLAV, V11, P43 CONTIN A, 1998, PLANT SCI, V139, P205 DEEKNAMKUL W, 1985, PLANT CELL REP, V4, P46 DORNENBURG H, 1997, FOOD TECHNOL-CHICAGO, V51, P47 ILIEVA M, 1996, BIOTECHNOL LETT, V18, P913 KING PJ, 1977, PLANT TISSUE CELL CU, P307 MURASHIGE T, 1962, PHYSIOL PLANTARUM, V15, P473 NAKAJIMA H, 1985, J BIOTECHNOL, V2, P107 NAKAJIMA H, 1989, J FERMENT BIOENG, V67, P306 NAKAMURA Y, 1990, B HOKKAIDO NATL FISH, V54, P1 RUDGE K, 1986, SECONDARY METABOLISM, P75 SAKURAI M, 1996, BIOTECHNOL LETT, V18, P1149 TREJO G, 1997, THESIS CINVESTAV IPN TREJOTAPIA G, 1999, ASIA-PAC J MOL BIOL, V7, P167 TREJOTAPIA G, 2001, PLANT CELL TISS ORG, V67, P19 WANG HQ, 1997, BIOTECHNOL LETT, V19, P353 WATANABE K, 1985, AGR BIOL CHEM TOKYO, V49, P533 WEBB JK, 1984, PHYTOCHEMISTRY, V23, P903 WIDHOLM JM, 1972, STAIN TECHNOL, V47, P189 NR 20 TC 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0167-6857 J9 PLANT CELL TISSUE ORGAN CULT JI Plant Cell Tissue Organ Cult. PD JAN PY 2003 VL 72 IS 1 BP 7 EP 12 PG 6 SC Biotechnology & Applied Microbiology; Plant Sciences GA 620CF UT ISI:000179515100002 ER PT J AU Torres-Valencia, JM Leon, GI Villagomez-Ibarra, JR Suarez-Castillo, OR Cerda-Garcia-Rojas, CM Joseph-Nathan, P TI Stereochemical assignment of naturally occurring 2,3-epoxy-2-methylbutanoate esters SO PHYTOCHEMICAL ANALYSIS LA English DT Article DE stereochemistry; H-NMR; 2,3-epoxy-2-methylbutanoates; (R)-(+)- and (S)-(-)-2-methyl-1,2-butanediol; Mosher's esters AB A method to determine the absolute configuration of 2,3-epoxy-2-methylbutanoate ester residues in natural products is presented, based on (i) the reduction of the ester function to yield a 2-methyl-1,2-butanediol, (ii) esterification of the obtained primary alcohol with either (R)-(+)- or (S)-(-)-Mosher's acid to afford the corresponding Mosher's ester, and (iii) H-1-NMR spectral comparison of the final product with that of the Mosher's esters prepared from 2-methyl-1,2-butanediols of known stereochemistry. Copyright (C) 2002 John Wiley Sons, Ltd. C1 Univ Autonoma Estado Hidalgo, Ctr Invest Quim, Pachuca 42076, Hidalgo, Mexico. Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. RP Torres-Valencia, JM, Univ Autonoma Estado Hidalgo, Ctr Invest Quim, Km 4-5 Carretera Pachuca Tulacingo,Unidad Univ, Pachuca 42076, Hidalgo, Mexico. CR ALAM M, 1992, INDIAN J EXP BIOL, V30, P38 DALE JA, 1968, J AM CHEM SOC, V90, P3732 DALE JA, 1969, J ORG CHEM, V34, P2543 KATO T, 1996, PLANTA MED, V62, P66 KIMURA Y, 1987, PLANTA MED, V53, P521 OKUDA H, 1989, 63150287, JP STILL WC, 1978, J ORG CHEM, V43, P2923 TORRESVALENCIA JM, 1995, TETRAHEDRON-ASYMMETR, V6, P1611 TORRESVALENCIA JM, 1998, PHYTOCHEMISTRY, V49, P2569 TORRESVALENCIA JM, 1998, TETRAHEDRON-ASYMMETR, V9, P757 TORRESVALENCIA JM, 1999, PHYTOCHEM ANALYSIS, V10, P221 NR 11 TC 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 0958-0344 J9 PHYTOCHEM ANALYSIS JI Phytochem. Anal. PD NOV-DEC PY 2002 VL 13 IS 6 BP 329 EP 332 PG 4 SC Chemistry, Analytical; Biochemical Research Methods; Plant Sciences GA 621GK UT ISI:000179580000005 ER PT J AU Planat, M Rosu, H Perrine, S TI Ramanujan sums for signal processing of low-frequency noise SO PHYSICAL REVIEW E LA English DT Article AB An aperiodic (low-frequency) spectrum may originate from the error term in the mean value of an arithmetical function such as Mobius function or Mangoldt function, which are coding sequences for prime numbers. In the discrete Fourier transform the analyzing wave is periodic and not well suited to represent the low-frequency regime. In place we introduce a different signal processing tool based on the Ramanujan sums c(q)(n), well adapted to the analysis of arithmetical sequences with many resonances p/q. The sums are quasiperiodic versus the time n and aperiodic versus the order q of the resonance. Different results arise from the use of this Ramanujan-Fourier transform in the context of arithmetical and experimental signals. C1 CNRS, Lab Phys & Metrol Oscillateurs, F-25044 Besancon, France. IPIC&T, Dept Appl Math, San Luis Potosi, Mexico. RP Planat, M, CNRS, Lab Phys & Metrol Oscillateurs, 32 Ave Observ, F-25044 Besancon, France. CR CASTRO C, 2002, CHAOS SOLITON FRACT, V13, P1407 GADIYAR HG, 1999, PHYSICA A, V269, P503 HARDY GH, 1979, INTRO THEORY NUMBERS KNAUF A, 1998, COMMUN MATH PHYS, V196, P703 KOENIG M, EXOSAT ARCHIVE LUCHT LG, 1995, ARCH MATH, V64, P121 MALLAT S, 1999, WAVELET TOUR SIGNAL PERRINE S, 2002, THEORIE MARKOFF DEV PLANAT M, 2000, IEEE T ULTRASON FERR, V47, P1173 PLANAT M, 2000, LECT NOTES PHYSICS, V550 PLANAT M, 2001, FLUCTUATION NOISE LE, V1, R65 PLANAT M, 2002, APPL PHYS LETT, V80, P2413 ROSU HC, 2002, MOD PHYS LETT A, V17, P1377 SCHROEDER MR, 1999, SPRINGER SERIES INFO SHUMWAY RH, 2000, TIME SERIES ANAL ITS TERRAS A, 1999, FOURIER ANAL FINITE YOUNG RM, 2001, INTRO NONHARMONIC FO NR 17 TC 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 2002 VL 66 IS 5 AR 056128 DI ARTN 056128 PG 7 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 622DG UT ISI:000179630800125 ER PT J AU Martinez, DF Reichl, LE Luna-Acosta, GA TI Quasienergy band structure of the harmonically driven delta-function chain SO PHYSICAL REVIEW B LA English DT Article ID DYNAMIC LOCALIZATION; ELECTRIC-FIELD; SEMICONDUCTOR SUPERLATTICES; BLOCH OSCILLATIONS; PARTICLE; SYSTEM; SPACE; ATOMS; CHAOS AB We study the quasienergy band structure of a potential consisting of a periodic array of harmonically oscillating delta functions. The perturbative and non-perturbative regimes are investigated using Floquet-Bloch states and the Floquet translation matrix whose eigenvalues and eigenvectors are given in terms of continued fractions. We study the structure of these eigenstates and relate it to the structure of the quasibound state of a single delta-function potential. We also study the dynamics of the bands as a function of the strength of the oscillating potential and find that the collapse of one of the quasienergy bands is related to the quenching of the transmission through a single delta-function potential. C1 Univ Texas, Dept Phys, Austin, TX 78712 USA. Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. RP Martinez, DF, Univ Texas, Dept Phys, 1 Univ Stn C1609, Austin, TX 78712 USA. 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Rev. B PD NOV 1 PY 2002 VL 66 IS 17 AR 174306 DI ARTN 174306 PG 14 SC Physics, Condensed Matter GA 621VL UT ISI:000179611700043 ER PT J AU Villavicencio, J Romo, R Silva, SSY TI Quantum-wave evolution in a step potential barrier SO PHYSICAL REVIEW A LA English DT Article ID FRONT PROPAGATION; EVANESCENT MEDIA; TIME-DEPENDENCE; TRANSIENT AB By using an exact solution to the time-dependent Schrodinger equation with a point source initial condition, we investigate both the time and spatial dependence of quantum waves in a step potential barrier. We find that for a source with energy below the barrier height, and for distances larger than the penetration length, the probability density exhibits a forerunner associated with a nontunneling process, which propagates in space at exactly the semiclassical group velocity. We show that the time of arrival of the maximum of the forerunner at a given fixed position inside the potential is exactly the traversal time tau. We also show that the spatial evolution of this transient pulse exhibits an invariant behavior under a rescaling process. This analytic property is used to characterize the evolution of the forerunner, and to analyze the role played by the time of arrival 3(-1/2)tau found recently by Muga and Buttiker [Phys. Rev. A 62, 023808 (2000)]. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Univ Autonoma Baja Calif, Fac Ciencias, Ensenada 22800, Baja California, Mexico. RP Villavicencio, J, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR ABRAMOWITZ M, 1965, HDB MATH FUNCTIONS, P297 BAUTE AD, 2001, J PHYS A-MATH GEN, V34, P4289 BROUARD S, 1996, PHYS REV A, V54, P3055 BUTTIKER M, 1998, ANN PHYS-BERLIN, V7, P602 BUTTIKER M, 1998, SUPERLATTICE MICROST, V23, P781 FADDEYEVA VN, 1961, TABLES PROBABILITY I GARCIACALDERON G, QUANTPH0206020 GARCIACALDERON G, 1997, PHYS REV A, V55, P3361 GARCIACALDERON G, 2001, PHYS REV A, V64 JAUHO AP, 1989, SUPERLATTICE MICROST, V6, P303 MORETTI P, 1992, PHYS SCR, V45, P18 MOSHINSKY M, 1952, PHYS REV, V88, P625 MOSHINSKY M, 1976, AM J PHYS, V44, P1037 MUGA JG, 2000, PHYS REV A, V62 STEVENS KWH, 1983, J PHYS C SOLID STATE, V16, P3649 TERANISHI N, 1987, SUPERLATTICE MICROST, V3, P509 VILLAVICENCIO J, 2000, J PHYS A-MATH GEN, V33, P6061 NR 17 TC 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 2002 VL 66 IS 4 AR 042110 DI ARTN 042110 PG 8 SC Physics, Atomic, Molecular & Chemical; Optics GA 619XF UT ISI:000179502200020 ER PT J AU Sanchez-Soto, LL Delgado, J Klimov, AB Bjork, G TI Description of entanglement in terms of quantum phase SO PHYSICAL REVIEW A LA English DT Article ID CONJUGATE VARIABLES; RELATIVE PHASE; 2 QUBITS; STATE; GATE; REPRESENTATION; DISTRIBUTIONS; DIFFERENCE; ALGORITHM; UNIVERSAL AB We explore the role played by the phase in an accurate description of the entanglement of bipartite systems. We first present an appropriate polar decomposition that leads to a truly Hermitian operator for the phase of a single qubit. We also examine the positive operator-valued measures that can describe the qubit phase properties. When dealing with two qubits, the relative phase seems to be a natural variable to understand entanglement. In this spirit, we propose a measure of entanglement based on this variable. C1 Univ Complutense, Fac Ciencias Fis, Dept Opt, E-28040 Madrid, Spain. Univ Guadalajara, Dept Fis, Guadalajara 44420, Jalisco, Mexico. Royal Inst Technol KTH, Dept Microelect & Informat Technol, SE-16440 Kista, Sweden. RP Sanchez-Soto, LL, Univ Complutense, Fac Ciencias Fis, Dept Opt, E-28040 Madrid, Spain. CR ABOURADDY AF, 2001, PHYS REV A, V64 ACIN A, 2001, J PHYS A-MATH GEN, V34, P6725 BARNETT SM, 1990, PHYS REV A, V42, P6713 BENNETT CH, 1996, PHYS REV A, V54, P3824 BENNETT CH, 2000, PHYS REV A, V63 BERGOU J, 1991, ANN PHYS-NEW YORK, V209, P470 BERGOU J, 1993, PHYS SCR T, V48, P1 BOUWMEESTER D, 2000, PHYSICS QUANTUM INFO BRAUNSTEIN SL, 1991, PHYS REV A, V43, P1153 BRUSS D, 2000, PHYS REV A, V62 BUSCH P, 1995, ANN PHYS-NEW YORK, V237, P1 CASADO A, 2001, EUR PHYS J D, V13, P109 CERF NJ, 2002, J MOD OPTIC, V49, P1355 CHUANG IL, 1998, NATURE, V393, P143 COHENTANNOUDJI C, 1992, QUANTUM MECH COLLINS D, 2002, PHYS REV A A, V65 DARIANO GM, 2001, PHYS REV A, V64 DECHOUM K, 2000, J MOD OPTIC, V47, P1273 DIVINCENZO DP, 1995, PHYS REV A, V51, P1015 EISERT J, 1999, J MOD OPTIC, V46, P145 EKERT A, 1995, AM J PHYS, V63, P415 EKERT A, 1996, REV MOD PHYS, V68, P733 ELLINAS D, 1991, J MATH PHYS, V32, P135 FIURASEK J, 2002, PHYS REV A A, V65 HELSTROM CW, 1974, INT J THEOR PHYS, V11, P357 HELSTROM CW, 1976, QUANTUM DETECTION ES HILL S, 1997, PHYS REV LETT, V78, P5022 JAEGER G, 1993, PHYS REV A, V48, P1023 JAEGER G, 1995, PHYS REV A, V51, P54 JONES JA, 1998, NATURE, V393, P344 JULSGAARD B, 2001, NATURE, V413, P400 LEONHARDT U, 1993, J MOD OPTIC, V40, P1745 LEONHARDT U, 1995, PHYS REV A, V51, P84 LEVYLEBLOND JM, 1973, REV MEX FIS, V22, P15 LUIS A, 1996, PHYS REV A, V53, P495 LUIS A, 1997, OPT COMMUN, V133, P159 LUIS A, 1997, PHYS REV A, V56, P994 LUIS A, 1998, EUR PHYS J D, V3, P195 LUIS A, 2000, PROG OPTICS, V41, P421 LYNCH R, 1995, PHYS REP, V256, P367 MANDEL L, 1995, OPTICAL COHERENCE QU MANKO VI, QUANTPH0207033 MONROE C, 1995, PHYS REV LETT, V75, P4714 NIELSEN MA, 2001, QUANTUM COMPUTATION PERELOMOV A, 1986, GEN COHERENT STATES PERES A, 1995, QUANTUM THEORY CONCE PERINA J, 1991, QUANTUM STAT LINEAR RAUSCHENBEUTEL A, 1999, PHYS REV LETT, V83, P5166 RUNGTA P, 2001, PHYS REV A, V64 SCHEICH W, 1994, QUANTUM OPT, V6, P125 SCHLEICH W, 2001, QUANTUM OPTICS PHASE SCHUMACHER B, 1995, PHYS REV A, V51, P2738 SHAPIRO JH, 1989, PHYS REV LETT, V62, P2377 SHAPIRO JH, 1991, PHYS REV A, V43, P3795 SHIMONY A, 1995, ANN NY ACAD SCI, V755, P675 SOLANO E, 2001, PHYS REV A, V64 STENHOLM S, 1992, ANN PHYS-NEW YORK, V218, P233 SUSSKIND L, 1964, PHYSICS LONG ISLAND, V1, P49 TANAS R, 1996, PROG OPTICS, V36, P161 TURCHETTE QA, 1995, PHYS REV LETT, V75, P4710 VEDRAL V, 1997, PHYS REV A, V56, P4452 VEDRAL V, 1997, PHYS REV LETT, V78, P2275 VIDAL G, 1999, PHYS REV LETT, V83, P1046 VIDAL G, 2002, PHYS REV A A, V65 VOURDAS A, 1990, PHYS REV A, V41, P1653 WOOTTERS WK, 1998, PHYS REV LETT, V80, P2245 NR 66 TC 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 2002 VL 66 IS 4 AR 042112 DI ARTN 042112 PG 8 SC Physics, Atomic, Molecular & Chemical; Optics GA 619XF UT ISI:000179502200022 ER PT J AU Garcia-Calderon, G Villavicencio, J Delgado, F Muga, JG TI Time scale of forerunners in quantum tunneling SO PHYSICAL REVIEW A LA English DT Article ID FRONT PROPAGATION; EVANESCENT MEDIA; TRAVERSAL TIME; TRANSIENT; DEPENDENCE; BARRIER AB The forerunners preceding the main tunneling signal of the wave created by a source with a sharp onset or by a quantum shutter have been generally associated with over-the-barrier (nontunneling) components. We demonstrate that, while this association is true for distances that are larger than the penetration length, for smaller distances the forerunner is dominated by under-the-barrier components. We find that its characteristic arrival time is inversely proportional to the difference between the barrier energy and the incidence energy, a tunneling time scale different from both the phase time and the Buttiker-Landauer time. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Univ Autonoma Baja California, Fac Ciencias, Ensenada 22800, Baja California, Mexico. Univ Pais Vasco, Dept Quim Fis, EHU, E-48080 Bilbao, Spain. RP Garcia-Calderon, G, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR BROUARD S, 1994, PHYS REV A, V49, P4312 BROUARD S, 1996, PHYS REV A, V54, P3055 BUTTIKER M, 1982, PHYS REV LETT, V49, P1739 BUTTIKER M, 1983, PHYS REV B, V27, P6178 BUTTIKER M, 1998, ANN PHYS-BERLIN, V7, P602 BUTTIKER M, 1998, SUPERLATTICE MICROST, V23, P781 COHEN L, 1995, TIME FREQUENCY ANAL DELGADO F, QUANTPH0207159 GARCIACALDERON G, 1997, PHYS REV A, V55, P3361 GARCIACALDERON G, 2001, PHYS REV A, V64 GHOSE P, 1999, TESTING QUANTUM MECH, CH10 HARTMAN TE, 1962, J APPL PHYS, V33, P3427 HAUGE EH, 1989, REV MOD PHYS, V61, P917 JAUHO AP, 1989, SUPERLATTICE MICROST, V6, P303 LANDAUER R, 1994, REV MOD PHYS, V66, P217 LEAVENS CR, 1990, SCANNING TUNNELING M MUGA JG, 2000, PHYS REP, V338, P353 MUGA JG, 2000, PHYS REV A, V62 MUGA JG, 2002, TIME QUANTUM MECH NIMTZ G, 2001, TIMES ARROWS QUANTUM, P125 RANFAGNI A, 1990, PHYS SCR, V42, P508 RANFAGNI A, 1991, PHYS LETT A, V158, P161 STEVENS KWH, 1980, EUR J PHYS, V1, P98 STEVENS KWH, 1983, J PHYS C SOLID STATE, V16, P3649 TERANISHI N, 1987, SUPERLATTICE MICROST, V3, P509 NR 25 TC 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 2002 VL 66 IS 4 AR 042119 DI ARTN 042119 PG 6 SC Physics, Atomic, Molecular & Chemical; Optics GA 619XF UT ISI:000179502200029 ER PT J AU Garcia-Mendoza, E Matthijs, HCP Schubert, H Mur, LR TI Non-photochemical quenching of chlorophyll fluorescence in Chlorella fusca acclimated to constant and dynamic light conditions SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE Chlorella fusca; dynamic light conditions; green algae; non-photochemical quenching; photoacclimation; state transitions; xanthophyll cycle ID XANTHOPHYLL-CYCLE; UNICELLULAR ALGAE; PHOTOSYSTEM-II; ZEAXANTHIN; LEAVES; PLANTS; ENERGY; PHOTOPROTECTION; PHOTOSYNTHESIS; VARIABILITY AB Non-photochemical quenching of chlorophyll fluorescence (NPQ) involves dissipation of light energy in the photosynthetic apparatus via a number of physiologically distinct processes. The relationships among NPQ, the (de)epoxidation state of the xanthophyll cycle pigments and state transitions was studied in the green alga Chlorella fusca, acquired from six differently light-acclimated continuous cultures. A 10 h light and 14 h darkness, periodicity was obeyed in all cultures. Three cultures received a high total daily irradiance, three others a low one. High and low irradiances were each dosed in three different modes at constant supply, with sine shape intensity modulation, or as a sine with superimposed oscillations. In the constant supply mode, but not for the sine and oscillating modes, high-light rendered a three-fold higher xantophyll cycle pigment content than low-light. Dynamic interconversion of xantophyll cycle pigments was restricted to high-light cultures. NPQ followed the kinetics of the light supply mode and was highest in high light cultures. In low-light cultures, NPQ correlated mainly to state transitions. These observations were supported by experiments with dithiothreithol-treated samples. The relative impact of xantophyll cycle operation and state transitions on NPQ in green algae from different light climates will be discussed with reference to higher plants. C1 Univ Amsterdam, IBED, AMB, NL-1018 WS Amsterdam, Netherlands. Univ Greifswald, Inst Ecol, Greifswald, Germany. RP Garcia-Mendoza, E, CICESE, Dept Ecol, Ensenada, Baja California, Mexico. CR ALLEN JF, 1992, BIOCHIM BIOPHYS ACTA, V1098, P275 BJORKMAN O, 1995, ECOPHYSIOLOGY PHOTOS, P17 CASPERLINDLEY C, 1998, PHOTOSYNTH RES, V56, P277 DEMMIG B, 1987, PLANT PHYSIOL, V84, P218 DEMMIGADAMS B, 1996, PLANTA, V198, P460 ESCOUBAS JM, 1995, P NATL ACAD SCI USA, V92, P10237 FALKOWSKI PG, 1997, AQUATIC PHOTOSYNTHES GILMORE AM, 1993, PHOTOSYNTH RES, V35, P67 GILMORE AM, 1997, PHYSIOL PLANTARUM, V99, P197 GILMORE AM, 1998, BIOCHEMISTRY-US, V37, P13582 HARTEL H, 1996, PLANT PHYSIOL, V110, P471 HAVAUX M, 1990, PLANT PHYSIOL BIOCH, V28, P735 HORTON P, 1988, BIOCHIM BIOPHYS ACTA, V932, P107 HORTON P, 1996, ANNU REV PLANT PHYS, V47, P655 JAHNS P, 1995, PLANT PHYSIOL BIOCH, V33, P683 JEFFREY SW, 1997, PHYTOPLANKTON PIGMEN KIRK JTO, 1994, LIGHT PHOTOSYNTHESIS, P314 KRAAY GW, 1992, J PHYCOL, V28, P708 KROON BMA, 1992, HYDROBIOLOGIA, V238, P63 KROON BMA, 1994, J PHYCOL, V30, P841 MASOJIDEK J, 1999, PLANTA, V209, P126 NIYOGI KK, 1997, PLANT CELL, V9, P1369 NIYOGI KK, 1999, ANNU REV PLANT PHYS, V50, P333 OLAIZOLA M, 1994, PHOTOSYNTH RES, V41, P357 PFANNSCHMIDT T, 1999, IUBMB LIFE, V48, P271 PFUNDEL E, 1994, PHOTOSYNTH RES, V42, P89 POSPISIL P, 1997, PHOTOSYNTHETICA, V34, P343 REES D, 1989, FEBS LETT, V256, P85 RICHARDSON K, 1983, NEW PHYTOL, V93, P157 SCHUBERT H, 1994, J BIOL CHEM, V269, P7267 SCHUBERT H, 2001, HELGOLAND MAR RES, V55, P12 VANKOOTEN O, 1990, PHOTOSYNTH RES, V25, P147 VANLIERE L, 1978, MITT INT VER LIMNOL, V21, P158 YAMAMOTO HY, 1962, ARCH BIOCHEM BIOPHYS, V97, P168 NR 34 TC 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PY 2002 VL 74 IS 3 BP 303 EP 315 PG 13 SC Plant Sciences GA 619VR UT ISI:000179498600007 ER PT J AU Hernandez, E Correa, A Bucio, L Souza, V Kershenobich, D Gutierrez-Ruiz, MC TI Pentoxifylline diminished acetaldehyde-induced collagen production in hepatic stellate cells by decreasing interleukin-6 expression SO PHARMACOLOGICAL RESEARCH LA English DT Article DE pentoxifylline; hepatic stellate cells; acetaldehyde; collagen; IL-6 ID FAT-STORING CELLS; ACUTE-PHASE RESPONSE; GROWTH-FACTOR; LIVER FIBROSIS; PROLIFERATION; RAT; MYOFIBROBLASTS; FIBROGENESIS; FIBROBLASTS; MODULATION AB The effect of pentoxifylline (PTX), a methylxanthine derivative, on collagen induction and secretion and on the production of mRNA of two fibrogenic cytokines: interleukin-6 and transforming growth factor-beta1 (IL-6 and TGF-beta(1)) in a rat hepatic stellate cell line (CFSC-2G) exposed to acetaldehyde was studied. CFSC-2G cells were treated with 175 AM acetaldehyde for 24 h. The cells were then exposed to a medium containing 200 muM PTX. Collagen secretion, increased 2.6 times in acetaldehyde treated cells. Cells exposed to acetaldehyde and treated with PTX diminished collagen secretion to control values and decreased alpha(1)(I) collagen mRNA by 15%. Reverse transcriptase-polymerase chain reaction (RT-PCR) assays of TGF-beta(1) mRNA showed no variation in different experimental conditions. However, PTX induced a decrease of 32% in IL-6 mRNA in acetaldehyde-treated cells. CFSC-2G cells treated with anti-IL-6 monoclonal antibody, 15 min before acetaldehyde was added, did not present an increase in alpha(1)(I) collagen mRNA. These results show that PTX inhibits the expression of a alpha(1)(I) collagen via the inhibition of IL-6 in acetaldehyde treated cells. The effect herein reported on IL-6 and alpha(1)(I) collagen mRNA adds to the previously described effect of PTX, which could be useful in the fibrogenic process induced by acetaldehyde. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Univ Autonoma Metropolitana Iztapalapa, Div Ciencias Salud, Mexico City 09340, DF, Mexico. Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Gastroenterol, Mexico City, DF, Mexico. RP Gutierrez-Ruiz, MC, Univ Autonoma Metropolitana Iztapalapa, Div Ciencias Salud, Apdo Postal 55-353, Mexico City 09340, DF, Mexico. CR AKIRA S, 1990, FASEB J, V4, P2860 BERMAN B, 1992, J INVEST DERMATOL, V98, P706 BOIGK G, 1995, J HEPATOL S1, V23, P142 CASINI A, 1993, J HEPATOL, V19, P385 CHOMCZYNSKI P, 1987, ANAL BIOCHEM, V162, P156 DENIZOT F, 1986, J IMMUNOL METHODS, V89, P271 DESMOULIERE A, 1999, J HEPATOL, V30, P621 DIEHL AM, 2000, IMMUNOL REV, V174, P160 FRIEDMAN SL, 1993, NEW ENGL J MED, V328, P1828 GREENWEL P, 1993, LAB INVEST, V69, P210 GRESSNER AM, 1995, DIGESTION, V56, P335 HEINRICH PC, 1990, BIOCHEM J, V265, P621 HOEBE KH, 2001, BIOCHEM PHARMACOL, V6, P1137 ISBRUCKER RA, 1998, TOXICOL APPL PHARM, V149, P120 KAMIMURA S, 1995, HEPATOLOGY, V21, P1304 KOJ A, 1996, BBA-MOL BASIS DIS, V1317, P84 KONDO K, 2001, CYTOKINE, V4, P220 LEFEVRE C, 1996, INT J IMMUNOPHARMACO, V18, P739 NATSUME M, 1999, J LEUKOCYTE BIOL, V66, P601 NIETO N, 1999, HEPATOLOGY, V30, P987 PETERSON TC, 1993, HEPATOLOGY, V17, P486 PINZANI M, 1996, BRIT J PHARMACOL, V119, P1117 PREAUX AM, 1997, HEPATOLOGY, V26, P315 ROMANELLI RG, 1997, BRIT J PHARMACOL, V122, P1047 WINDMEIER C, 1996, BIOCHEM PHARMACOL, V51, P577 WINDMEIER C, 1997, GEN PHARMACOL, V29, P181 WOESSNER JF, 1961, ARCH BIOCHEM BIOPHYS, V93, P440 NR 27 TC 3 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 1043-6618 J9 PHARMACOL RES JI Pharmacol. Res. PD NOV PY 2002 VL 46 IS 5 BP 435 EP 443 PG 9 SC Pharmacology & Pharmacy GA 620KD UT ISI:000179531800010 ER PT J AU de la Paz, LDO Lezama, R Torres-Marquez, ME Pasantes-Morales, H TI Tyrosine kinases and amino acid efflux under hyposmotic and ischaemic conditions in the chicken retina SO PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY LA English DT Article DE amino acids; ischaemia; hyposmolarity; swelling; glutamate; taurine; tyrosine kinases; P13K ID REGULATORY VOLUME DECREASE; MITOGEN-ACTIVATED PROTEIN; ANION CHANNEL BLOCKER; RAT CEREBRAL-CORTEX; TAURINE EFFLUX; CELL-VOLUME; GLUTAMATE RELEASE; BRAIN-CELLS; MAP KINASE; ISCHEMIA AB The chicken retina was exposed to 20% hyposmotic or ischaemia-like (54 mM KC1 and I mM ouabain) conditions and changes in cell volume, amino acid release and activation of protein tyrosine kinases measured. To investigate possible connection between these cellular events, the effect of tyrosine kinase blockers on H-3-taurine, H-3-GABA and H-3-D-aspartate (as a tracer for glutamate) efflux was examined. Both hyposmotic and ischaemic conditions increased phosphorylation of the tyrosine kinase p125 focal adhesion kinase (p125(FAK)) and the mitogen-activated protein kinase-p38 (MAPK-p38), but not of the extracellular-signal-related kinases-1/2 (ERK1/ERK2), and markedly activated the tyrosine kinase target enzyme phosphatidylinositide 3-kinase (P13K). Hyposmolarity and ischaemia both led to rapid retinal swelling followed by active volume recovery of 84% (hyposmolarity) and 40% (ischaemia), together with rapid release of taurine, GABA and D-aspartate. Taurine and GABA efflux under both conditions was reduced markedly by tyrosine kinase and P13K blockers (50 muM tyrphostin A23, 50 muM genistein, 100 nM wortmannin, 25 muM LY294002) and was decreased by 85% when ischaemia-induced swelling was prevented. About 65% of D-aspartate efflux occurred irrespective of swelling in ischaemia and was either less sensitive (hyposmotic) or largely resistant (ischaemia) to the blockers. These results suggest that in ischaemia, GABA and taurine react primarily to swelling with a typical osmolyte response, while glutamate differs in its release mechanisms under both hyposmotic and ischaemic conditions. These findings suggest new strategies for evaluating the contribution of swelling to excitotoxicity in ischaemia. C1 Natl Autonomous Univ Mexico, Dept Biophys, Inst Cell Physiol, Sch Med, Mexico City 04510, DF, Mexico. Natl Autonomous Univ Mexico, Dept Biochem, Sch Med, Mexico City 04510, DF, Mexico. RP Pasantes-Morales, H, Natl Autonomous Univ Mexico, Dept Biophys, Inst Cell Physiol, Sch Med, Apartado Postal 70-253, Mexico City 04510, DF, Mexico. CR BRADFORD MM, 1976, ANAL BIOCHEM, V72, P248 CREPEL V, 1998, J NEUROSCI, V18, P1196 DELEUZE C, 2000, J PHYSIOL-LONDON, V523, P291 ESTEVEZ AY, 2000, BRAIN RES BULL, V52, P45 FERANCHAK AP, 1998, J BIOL CHEM, V273, P14906 FERANCHAK AP, 1999, J BIOL CHEM, V274, P30979 FERANCHAK AP, 2001, J CLIN INVEST, V108, P1495 FRANCO R, 2001, PFLUG ARCH EUR J PHY, V442, P791 HAYASHI A, 1999, CURR EYE RES, V18, P231 HOFFMANN EK, 2000, CELL PHYSIOL BIOCHEM, V10, P273 HUANG CC, 2001, J CELL PHYSIOL, V189, P316 HUBERT EM, 2000, PFLUG ARCH EUR J PHY, V440, P132 KIMELBERG HK, 1992, CAN J PHYSIOL PHAR S, V70, S323 KIMELBERG HK, 1992, J NEUROTRAUM, V9, S71 KIMELBERG HK, 2000, NEUROREPORT, V11, P2675 KIRK K, 1997, J MEMBRANE BIOL, V158, P1 KITAGAWA H, 1999, NEUROSCI LETT, V274, P45 KLETZIEN RF, 1975, ANAL BIOCHEM, V68, P537 LALI FV, 2000, J BIOL CHEM, V275, P7395 LANG F, 1998, PHYSIOL REV, V78, P247 LEPPLEWIENHUES A, 2000, CELL PHYSIOL BIOCHEM, V10, P307 MONGIN AA, 1999, AM J PHYSIOL-CELL PH, V276, C1226 MORALESMULIA S, 2001, NEUROCHEM INT, V38, P153 NAMURA S, 2001, P NATL ACAD SCI USA, V98, P11569 NILIUS B, 2000, CELL PHYSIOL BIOCHEM, V10, P313 PARK KM, 2001, J BIOL CHEM, V276, P11870 PASANTESMORALES H, 1996, METAB BRAIN DIS, V11, P187 PASANTESMORALES H, 1999, NEUROCHEM RES, V24, P1339 PASANTESMORALES H, 2000, CELL PHYSIOL BIOCHEM, V10, P361 PASANTESMORALES H, 2000, NEUROCHEM RES, V25, P1301 PHILLIS JW, 1997, BRAIN RES, V758, P9 PHILLIS JW, 1998, BRAIN RES, V780, P352 PHILLIS JW, 2000, BRAIN RES, V880, P224 ROSENBERG GA, 1999, PROG CARDIOVASC DIS, V42, P209 ROSSI DJ, 2000, NATURE, V403, P316 RUTLEDGE EM, 1998, AM J PHYSIOL-CELL PH, V274, C1511 SARANSAARI P, 1999, NEUROSCIENCE, V94, P949 SEKI Y, 1999, STROKE, V30, P433 SHEN MR, 2001, J PHYSIOL-LONDON, V537, P347 SONG D, 1998, J PHARM PHARMACOL, V50, P1280 STUTZIN A, 1997, AM J PHYSIOL-CELL PH, V273, C999 TILLY BC, 1996, MOL BIOL CELL, V7, P1419 VANDERWIJK T, 2000, CELL PHYSIOL BIOCHEM, V10, P289 VERBALIS JG, 1991, BRAIN RES, V567, P274 VOMDAHL S, 2001, CELL PHYSIOL BIOCHEM, V11, P285 NR 45 TC 7 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0031-6768 J9 PFLUGERS ARCH-EUR J PHYSIOL JI Pflugers Arch. PD OCT PY 2002 VL 445 IS 1 BP 87 EP 96 PG 10 SC Physiology GA 621EP UT ISI:000179575800013 ER PT J AU Davies, BR Rizo, T Arroyo-Valerio, A TI Congenital heart disease and its association with other congenital malformations found at autopsy SO PEDIATRIC PATHOLOGY & MOLECULAR MEDICINE LA English DT Article DE abnormalities; congenital; congenital heart disease ID NEURAL CREST ABLATION; CARDIOVASCULAR MALFORMATIONS; EXTRACARDIAC ANOMALIES; GENETIC-ASPECTS; ABNORMALITIES; CARDIOGENESIS; POPULATION; INFANTS; ALCOHOL; DEFECTS AB The objective was to determine if a study of other malformations found at autopsy in patients with congenital heart disease would contribute to an understanding of the mechanisms involved in the formation of these anomalies. In a large general hospital autopsies in children with congenital heart disease were selected, and the different cardiopathies were divided into 3 groups: those with isolated heart lesions, those with single gene mutants, as well as chromosome malformations, and those with idiopathic malformations not associated with a genetic syndrome. Because the cardiopathies most often associated with genetic syndromes were the septal defects in general (p=.001), it was presumed that these are influenced to a considerable extent by genetic factors. The association of left heart hypoplasia and coarctation of the aorta with multiple idiopathic malformations, particularly in the lower half of the body (p =.002), suggests that the latter may be due to vascular disruptions, because of the interruption of the flow of oxygenated blood in the embryo fetus produced by these heart defects. Cranial defects were not associated with left heart obstruction, and are therefore unlikely to be produced by vascular disruption. C1 Hosp Gen Mexico City, Unidad Patol, Dept Pathol, Mexico City 06726, DF, Mexico. RP Davies, BR, Hosp Gen Mexico City, Unidad Patol, Dept Pathol, Dr Balmis 148,Col Doctores, Mexico City 06726, DF, Mexico. CR ATKINS DL, 1982, CIRCULATION, V66, P281 BOCKMAN DE, 1990, ANN NY ACAD SCI, V588, P296 BOUGHMAN JA, 1987, AM J MED GENET, V26, P839 BRENNER JI, 1989, AM J DIS CHILD, V143, P1492 BRUYERE HJ, 1994, TERATOLOGY, V49, P104 BULBUL ZR, 1993, SEMIN PERINATOL, V17, P61 CLARK EB, 1986, AM J DIS CHILD, V140, P41 COPEL JA, 1993, SEMIN PERINATOL, V17, P89 ESTERLY JR, 1969, LANCET, V1, P1028 FERENCZ C, 1989, J AM COLL CARDIOL, V14, P756 FERENCZ C, 1989, J PEDIATR, V114, P79 FYLER DC, 1980, PEDIATRICS S, V65, P375 GERSCHWIND SA, 1992, AM J EPIDEMIOL, V135, P1197 GLAUSER TA, 1990, PEDIATRICS, V85, P984 GREENWOOD RD, 1975, PEDIATRICS, V55, P485 HARH JY, 1973, AM J CARDIOL, V31, P51 HOYME HE, 1981, PEDIATRICS, V67, P288 KIRBY ML, 1983, SCIENCE, V220, P1059 KIRBY ML, 1990, ANN NY ACAD SCI, V588, P289 KURNIT DM, 1985, ANN NY ACAD SCI, V450, P191 LEATHERBURY L, 1991, PEDIATR RES, V30, P509 LOUW JH, 1995, LANCET, V346, P1065 MACHIN GA, 1991, TXB FETAL PERINATAL, P310 MORRIS CD, 1990, PEDIATRICS, V85, P977 NATOWICZ M, 1988, PEDIATRICS, V82, P698 OKADA R, 1968, ARCH PATHOL LAB MED, V85, P649 PATTERSON K, 1992, PEDIAT PATHOLOGY, P576 ROSE V, 1992, NEONATAL HEART DIS, P3 RUCKMAN RN, 1990, ANN NY ACAD SCI, V588, P281 RUSSELL GA, 1992, RECENT ADV HISTOPATH, V15, P219 SHOKEIR MHK, 1974, BIRTH DEFECTS, V10, P223 SRIVASTAVA D, 1999, CURR OPIN CARDIOL, V14, P263 NR 32 TC 1 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA SN 1522-7952 J9 PEDIATR PATHOL MOL MED JI Pediatr. Pathol. Mol. Med. PD NOV-DEC PY 2002 VL 21 IS 6 BP 541 EP 549 PG 9 SC Pathology; Pediatrics GA 619YL UT ISI:000179505400004 ER PT J AU Apolinar-Iribe, A Korneev, N Vysloukh, V Gomez-Sarabia, CM TI Transverse modulational instability of periodic light patterns in photorefractive strontium barium niobate crystal SO OPTICS LETTERS LA English DT Article ID SPATIAL SOLITONS; BEAMS; MEDIA AB Interference fringes produced by the intersection of two plane waves in photorefractive strontium barium niobate crystal break in the transverse direction if the external electric field is high enough. For a certain relation between fringe spacing and nonlinearity strength, the tendency to regular pattern formation has been observed. We present a simple theory that qualitatively explains this effect. (C) 2002 Optical Society of America. C1 Univ Sonora, Dept Fis, Hermosillo, Sonora, Mexico. Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. RP Apolinar-Iribe, A, Univ Sonora, Dept Fis, Apdo Postal 1626,CP 8300, Hermosillo, Sonora, Mexico. CR ANASTASSIOU C, 2000, PHYS REV LETT, V85, P4888 INFELD E, 1997, PHYS REV E B, V55, P6101 ITURBECASTILLO MD, 1995, OPT LETT, V20, P1853 KIVSHAR YS, 2000, PHYS REP, V331, P117 KORNEEV N, 2001, J MOD OPTIC, V48, P751 KORNEEV N, 2001, OPT COMMUN, V197, P209 MAMAEV AV, 1996, EUROPHYS LETT, V35, P25 MAMAEV AV, 1996, PHYS REV A, V54, P870 STEGEMAN GI, 1999, SCIENCE, V286, P1518 NR 9 TC 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPTICS LETTERS JI Opt. Lett. PD DEC 1 PY 2002 VL 27 IS 23 BP 2088 EP 2090 PG 3 SC Optics GA 621AC UT ISI:000179565500010 ER PT J AU Shcherbakov, AS Lopez, AA TI Observation of the optical components inherent in multi-wave non-collinear acousto-optical coupled states SO OPTICS EXPRESS LA English DT Article AB Three- and four-wave spatial Bragg solitons in the form of weakly coupled states, originating with one- and two-phonon non-collinear scattering of light in anisotropic medium, are uncovered. The spatial-frequency distributions of their optical components are investigated both theoretically and experimentally. (C) 2002 Optical Society of America. C1 Natl Inst Astrophys Opt & Elect, Puebla 72000, Mexico. RP Shcherbakov, AS, Natl Inst Astrophys Opt & Elect, AP 51 & 216, Puebla 72000, Mexico. CR BALAKSHY VI, 1985, PHYSICAL PRINCIPLES KORPEL A, 1989, ACOUSTO OPTICS MAIMISTOV AI, 1999, NONLINEAR OPTICAL WA PELINOVSKY DE, 2000, PHYS REV E B, V62, P8668 SHCHERBAKOV AS, 1998, 3 WAVE INTERACTION S SHCHERBAKOV AS, 2001, PROPERTIES SOLITARY, P100 SHCHERBAKOV AS, 2002, NLMD, V7, P1 SUKHORUKOV AP, 1988, NONLINEAR WAVE INTER YU F, 2001, INTRO INFORMATION OP NR 9 TC 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1094-4087 J9 OPT EXPRESS JI Opt. Express PD DEC 2 PY 2002 VL 10 IS 24 BP 1398 EP 1403 PG 6 SC Optics GA 621DL UT ISI:000179573200003 ER PT J AU Cordova-Martiinez, W De la Rosa-Cruz, E Diaz-Torres, LA Salas, P Montoya, A Avendano, M Rodriguez, RA Barbosa-Garcia, O TI Nanocrystalline tetragonal zirconium oxide stabilization at low temperatures by using rare earth ions: Sm3+ and Tb3+ SO OPTICAL MATERIALS LA English DT Article DE zirconia; phase transformation; sol-gel; nanocrystal and rare earth ID SOL-GEL PROCESS; FILMS AB Zirconium oxide was synthesized by the sol-gel method and the tetragonal structure was stabilized up to 1000 degreesC by doping with different rare earth ions. The evolution of the crystalline structure as a function of the annealing temperature and rare earth concentration of doped and undoped samples were investigated by X-ray diffraction. Our experimental results show that it is possible to obtain up to 73 wt.% of tetragonal content by doping the ZrO2 with 2 mol% Of Sm2O3 or, Tb2O3 and annealing at 1000 degreesC. Variations in the lattice parameters and nanocrystallite size were also obtained. Our results suggest that the stabilization of tetragonal structure can be obtained with other rare earth ions. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Ctr Invest Opt AC, Leon 37150, Gto, Mexico. Inst Mexicano Petr, Mexico City 07730, DF, Mexico. RP De la Rosa-Cruz, E, Ctr Invest Opt AC, AP 1-948, Leon 37150, Gto, Mexico. CR ANSORI ZA, 1997, THIN SOLID FILMS, V305, P330 ARMENDARIZ H, 1998, J CATAL, P173 CALLON GJ, 2000, J MATER SCI LETT, V19, P1689 CARBAJAL R, 1993, PHYSICA B, V55, P192 CULLITY BD, 1978, ELEMENTS XRAY DIFFRA, P102 DELAROSACRUZ E, 2001, J PHYS D APPL PHYS, V34, L83 GARVIE RC, 1965, J PHYS CHEM-US, V69, P1238 GARVIE RC, 1972, J AM CERAM SOC, V55, P303 HARRISON DE, 1963, J ELECTROCHEM SOC, V110, P23 JI Z, 2001, SURF COAT TECH, V135, P109 MCCULLOUGH JD, 1959, ACTA CRYSTALLOGR, V12, P507 MCLEOD HA, 1986, THIN FILM OPTICAL FI, P519 PEREYRAPEREA E, 1998, J PHYS D APPL PHYS, V31, L7 REISFELD R, 2000, J ALLOY COMPD, V300, P147 SALAS P, UNPUB MONOCLINIC ZRO SALAS P, 2000, MATER LETT, V45, P241 SAVOINI B, 1997, PHYS REV B, V56, P5856 SCOTT HG, 1981, J AUST CERAM SOC, V17, P16 TEUFER G, 1962, ACTA CRYSTALLOGR, V15, P1187 THOMAS IM, 1994, P SOC PHOTO-OPT INS, V2288, P50 URLACHER C, 1999, OPT MATER, V12, P19 NR 21 TC 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD NOV-DEC PY 2002 VL 20 IS 4 BP 263 EP 271 PG 9 SC Materials Science, Multidisciplinary; Optics GA 620EL UT ISI:000179521000003 ER PT J AU Plaschko, P TI Deterministic and stochastic oscillations of a flexible cylinder in arrays of static tubes SO NONLINEAR DYNAMICS LA English DT Article DE 1 and 2-DOF motions; oscillation; lines and curves ID FLOW-INDUCED OSCILLATIONS; CROSS-FLOW; INDUCED VIBRATIONS; BIFURCATIONS AB This study concentrates on vortex-induced vibrations of one flexible cylinder in an array of fixed tubes. To describe approximately the dynamics of this system we generalize a previously developed linear semi-empirical model that includes memory effects. We choose a cubic damping term to model adequately vortex-induced oscillations and we obtain thus a nonlinear integro-differential equation governing the displacement of the cylinder. We use a two-variable expansion to derive criteria for the appearance of stable, periodic, nonlinear oscillations. This approach predicts the appearance of a limit cycle and gives a criterion for the stability of the oscillations. In a stochastic oscillation model we apply additive white noise to the otherwise deterministic oscillator model. For small values of the noise intensity we can approximately solve the Fokker-Planck equation. A comparison of this approximation with numerical simulations shows a satisfactory degree of agreement. C1 Univ Autonoma Metropolitana Iztapalapa, Dept Phys, Mexico City 09340, DF, Mexico. RP Plaschko, P, Univ Autonoma Metropolitana Iztapalapa, Dept Phys, Mexico City 09340, DF, Mexico. CR BENJACOB E, 1983, ANN NY ACAD SCI, V410, P323 BERGER E, 1988, J WIND ENG IND AEROD, V28, P301 BERGER E, 1993, J FLUID STRUCT, V7, P849 BLEVINS RD, 1990, FLOW INDUCED VIBRATI BRIKA D, 1993, J FLUID MECH, V250, P481 FENG CC, 1968, THESIS U BRIT COLUMB GRANGER S, 1993, J FLUID STRUCTURES, V7, P471 GRANGER S, 1996, J FLUID MECH, V320, P163 KLOEDEN PE, 1997, NUMERICAL SOLUTION S KOBAYASHI T, 1980, THESIS TU BERLIN BER LEVER JH, 1993, J FLUID STRUCTURES, V7, P521 PAIDOUSSIS MP, 1988, J FLUID MECH, V187, P45 PARKINSON GV, 1961, J APPL MECH, V28, P252 PARKINSON GV, 1964, J APPL MATH, V17, P255 PARKINSON GV, 1972, FLOW INDUCED STRUCTU, P81 PLASCHKO P, UNPUB VORTEX INDUCED PLASCHKO P, 1993, NONLINEAR DYNAM, V4, P251 PLASCHKO P, 1996, J FLUID STRUCT, V10, P33 PLASCHKO P, 2000, J FLUID STRUCT, V14, P883 PRICE SJ, 1990, J SOUND VIB, V137, P419 VANKAMPEN NG, 1992, STOCHASTIC PROCESSES NR 21 TC 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0924-090X J9 NONLINEAR DYNAMICS JI Nonlinear Dyn. PD DEC PY 2002 VL 30 IS 4 BP 337 EP 355 PG 19 SC Engineering, Mechanical; Mechanics GA 619LN UT ISI:000179477600003 ER PT J AU Mora-Duarte, J Betts, R Rotstein, C Colombo, AL Thompson-Moya, L Smietana, J Lupinacci, R Sable, C Kartsonis, N Perfect, J CA Caspofungin Invasive Candidiasis S TI Comparison of caspofungin and amphotericin B for invasive candidiasis. SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID ANTIFUNGAL MK-0991 L-743,872; BLOOD-STREAM INFECTIONS; IN-VITRO ACTIVITY; ECHINOCANDIN ANTIFUNGAL; FLUCONAZOLE-RESISTANT; FUNGAL-INFECTIONS; RANDOMIZED TRIAL; CANDIDEMIA; SURVEILLANCE; MULTICENTER AB Background: Caspofungin is an echinocandin agent with fungicidal activity against candida species. We performed a double-blind trial to compare caspofungin with amphotericin B deoxycholate for the primary treatment of invasive candidiasis. Methods: We enrolled patients who had clinical evidence of infection and a positive culture for candida species from blood or another site. Patients were stratified according to the severity of disease, as indicated by the Acute Physiology and Chronic Health Evaluation (APACHE II) score, and the presence or absence of neutropenia and were randomly assigned to receive either caspofungin or amphotericin B. The study was designed to compare the efficacy of caspofungin with that of amphotericin B in patients with invasive candidiasis and in a subgroup with candidemia. Results: Of the 239 patients enrolled, 224 were included in the modified intention-to-treat analysis. Base-line characteristics, including the percentage of patients with neutropenia and the mean APACHE II score, were similar in the two treatment groups. A modified intention-to-treat analysis showed that the efficacy of caspofungin was similar to that of amphotericin B, with successful outcomes in 73.4 percent of the patients treated with caspofungin and in 61.7 percent of those treated with amphotericin B (difference after adjustment for APACHE II score and neutropenic status, 12.7 percentage points; 95.6 percent confidence interval, -0.7 to 26.0). An analysis of patients who met prespecified criteria for evaluation showed that caspofungin was superior, with a favorable response in 80.7 percent of patients, as compared with 64.9 percent of those who received amphotericin B (difference, 15.4 percentage points; 95.6 percent confidence interval, 1.1 to 29.7). Caspofungin was as effective as amphotericin B in patients who had candidemia, with a favorable response in 71.7 percent and 62.8 percent of patients, respectively (difference, 10.0 percentage points; 95.0 percent confidence interval, -4.5 to 24.5). There were significantly fewer drug-related adverse events in the caspofungin group than in the amphotericin B group. Conclusions: Caspofungin is at least as effective as amphotericin B for the treatment of invasive candidiasis and, more specifically, candidemia. C1 CCSS, Neeman ICIC & Hosp Mexico, San Jose, Costa Rica. Univ Rochester, Rochester, NY USA. McMaster Univ, Hamilton, ON, Canada. UNIFESP, Escola Paulista Med, Sao Paulo, Brazil. Clin Santa Maria, Santiago, Chile. Merck Res Labs, W Point, PA USA. RP Perfect, J, Duke Univ, Med Ctr, POB 3353,Trent Dr,Rm 1558,Duke S, Durham, NC 27710 USA. CR ABRUZZO GK, 1997, ANTIMICROB AGENTS CH, V41, P2333 ANAISSIE EJ, 1996, AM J MED, V101, P170 ANAISSIE EJ, 1996, CLIN INFECT DIS, V23, P964 ARATHOON EG, 2002, ANTIMICROB AGENTS CH, V46, P451 ASCIOGLU S, 2002, CLIN INFECT DIS, V34, P7 BACHMAN SP, 2000, 40 INT C ANT AG CHEM, P352 BARCHIESI F, 1999, EUR J CLIN MICROBIOL, V18, P302 BARTIZAL K, 1997, ANTIMICROB AGENTS CH, V41, P2326 BODEY GP, 1992, CANDIDIASIS PATHOGEN, P279 COLOMBO AL, 1999, DIAGN MICR INFEC DIS, V34, P281 GALLIS HA, 1990, REV INFECT DIS, V12, P308 GRANINGER W, 1993, J INFECTION, V26, P133 IKEMOTO H, 1989, DIAGN MICROBIOL INFE, V12, P239 KAO AS, 1999, CLIN INFECT DIS, V29, P1164 KUJATH P, 1989, INFECTION, V17, P111 MARTINEZSUAREZ JV, 1996, ANTIMICROB AGENTS CH, V40, P1277 MEUNIER F, 1989, EUR J CLIN MICROBIOL, V8, P438 NELSON PW, 1997, J MED VET MYCOL, V35, P285 NGUYEN MH, 1995, ARCH INTERN MED, V155, P2429 NOLLASALAS J, 1992, CLIN INFECT DIS, V14, P952 NUCCI M, 2001, 41 INT C ANT AG CHEM, P393 PFALLER MA, 1999, DIAGN MICR INFEC DIS, V35, P19 PFALLER MA, 2000, ANTIMICROB AGENTS CH, V44, P747 PHILLIPS P, 1997, EUR J CLIN MICROBIOL, V16, P337 REX JH, 1994, NEW ENGL J MED, V331, P1325 REX JH, 1995, ANTIMICROB AGENTS CH, V39, P1 SABLE CA, 2002, TRANSPLANT INFECT DI, V4, P25 VANTWOUT JW, 1988, J ANTIMICROB CHEMOTH, V21, P665 VAZQUEZ JA, 1997, ANTIMICROB AGENTS CH, V41, P1612 VILLANUEVA A, 2001, CLIN INFECT DIS, V33, P1529 VILLANUEVA A, 2002, AM J MED, V113, P294 YAMAMURA DLR, 1999, CAN MED ASSOC J, V160, P493 NR 32 TC 215 PU MASSACHUSETTS MEDICAL SOC/NEJM PI WALTHAM PA WALTHAM WOODS CENTER, 860 WINTER ST,, WALTHAM, MA 02451-1413 USA SN 0028-4793 J9 N ENGL J MED JI N. Engl. J. Med. PD DEC 19 PY 2002 VL 347 IS 25 BP 2020 EP 2029 PG 10 SC Medicine, General & Internal GA 626LT UT ISI:000179874500005 ER PT J AU Floran, B Barajas, C Floran, L Erlij, D Aceves, J TI Adenosine Al receptors control dopamine Dl-dependent [H-3]GABA release in slices of substantia nigra pars reticulata and motor behavior in the rat SO NEUROSCIENCE LA English DT Article DE adenosine antagonists; basal ganglia; cAMP; GABA transmission; Parkinson's disease; turning behavior ID INTERSTITIAL FLUID ADENOSINE; ENDOGENOUS GABA RELEASE; D-1 RECEPTORS; BASAL GANGLIA; ROTATIONAL BEHAVIOR; PARKINSONS-DISEASE; CAUDATE-PUTAMEN; A(1); MODULATION; STIMULATION AB Abnormalities in dopaminergic control of basal ganglia function play a key role in Parkinson's disease. Adenosine appears to modulate the dopaminergic control in striatum, where an inhibitory interaction between adenosine and dopamine receptors has been demonstrated. However the interaction has not been established in substantia nigra pars reticulata (SNr) where density of both receptors is high. Here we have explored the interaction between A1/D1 receptors in SNr. In SNr slices, SKF 38393, a selective D1 receptor agonist, produced a stimulation of depolarization-induced Ca2+-dependent [H-3]GABA release that was inhibited by adenosine. The adenosine inhibition was abolished by 8-cyclopentyl-1,3-dipropylxanthine (DPCPX), a selective adenosine A1 receptor antagonist. DPCPX per se enhanced GABA release, indicating inhibition of the release by endogenous adenosine. When D1 receptors were blocked with SCH 23390 or the slices were depleted of dopamine, the effect of DPCPX was suppressed, showing that activation of dopamine receptors was necessary for the adenosine inhibition. In normal slices, 2-chloro-eta(6)-cyclopentyladenosine (CCPA), a selective A1 agonist, inhibited GABA release, but the inhibition was prevented by the blockade of D1 receptors with SCH 23390. Superperfusion with 8-bromo-cAMP produced a stimulation of GABA release that was not blocked by CCPA: this finding indicates that the blockade of D1 effects caused by activation of A1 receptors is specific. To see if these actions on GABA release were correlated with changes in motor behavior we studied the effect of unilateral intranigral injections of modifiers of adenosine A1 and dopamine D1 receptors in rats challenged with systemic methamphetamine. Both the A1 agonist CCPA and the D1 antagonist SCH 23390 produced ipsilateral turning whereas the A1 antagonist DPCPX caused contralateral turning. These motor effects are consistent with the findings on GABA release. The results indicate the presence of an inhibitory A1/D1 receptor interaction in SNr. The inhibition exerted by A1 adenosine receptors on GABAergic striatonigral transmission would be due exclusively to blockade of the facilitation resulting from activation of D1 dopamine receptors. The data permit to better understand the action of adenosine antagonists in the treatment of Parkinson's disease. (C) 2002 IBRO. Published by Elsevier Science Ltd. All rights reserved. C1 Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fisiol Biofis & Neurociencias, Mexico City 07000, DF, Mexico. Suny Downstate Med Ctr, Dept Physiol, Brooklyn, NY 11203 USA. RP Floran, B, Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fisiol Biofis & Neurociencias, Apartado Postal 14-740, Mexico City 07000, DF, Mexico. CR ABBRACCHIO MP, 1987, PHARMACOL RES COMMUN, V19, P275 ACEVES J, 1981, NEUROSCIENCE, V6, P2069 BAHENA R, 1998, ABSTR SOC NEUROSCI, V24, P854 BALLARIN M, 1987, NEUROSCI LETT, V83, P338 BALLARIN M, 1991, ACTA PHYSIOL SCAND, V142, P97 FERRE S, 1992, NEUROSCIENCE, V51, P501 FERRE S, 1994, NEUROREPORT, V6, P73 FERRE S, 1996, NEUROSCI LETT, V208, P109 FERRE S, 1997, PSYCHOPHARMACOLOGY, V133, P107 FERRE S, 1998, J BIOL CHEM, V273, P4718 FLORAN B, 1988, EUR J PHARMACOL, V150, P277 FLORAN B, 1990, NEUROSCI LETT, V116, P136 FORN J, 1974, SCIENCE, V186, P1118 FRANKHUYZEN AL, 1982, EUROPEAN J PHARM, V78, P91 FUXE K, 1998, BRAIN RES REV, V26, P258 GARCIA M, 1997, NEUROSCIENCE, V80, P241 GERFEN CR, 1996, HDB CHEM NEUROANATOM, V12, P369 GINES S, 2000, P NATL ACAD SCI USA, V97, P8606 HAUBER W, 1998, NEUROREPORT, V9, P1803 JIANG H, 1993, BRAIN RES, V613, P347 KATONA I, 1999, J NEUROSCI, V19, P4544 MAYFIELD RD, 1993, J NEUROCHEM, V60, P2334 MAYFIELD RD, 1999, SYNAPSE, V33, P274 PARK TS, 1987, J CEREBR BLOOD F MET, V7, P633 PAXINOS G, 1997, RAT BRIAN STEREOTAXI POPOLI P, 1994, EUR J PHARMACOL, V257, P21 POPOLI P, 1996, NEUROSCI LETT, V218, P209 RADNIKOW G, 1998, J NEUROSCI, V18, P2009 RICHARDSON PJ, 1997, TRENDS PHARMACOL SCI, V18, P338 ROBERTSON HA, 1992, TRENDS NEUROSCI, V15, P201 SCHIFFMANN SN, 1991, J NEUROCHEM, V57, P1062 SCHOFFELMEER ANM, 2000, J NEUROSCI, V20, P3496 SHEN KZ, 1997, J PHYSIOL-LONDON, V505, P153 SVENNINGSSON P, 1998, J COMP NEUROL, V399, P229 VANWYLEN DGL, 1986, J CEREBR BLOOD F MET, V6, P522 NR 35 TC 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4522 J9 NEUROSCIENCE JI Neuroscience PY 2002 VL 115 IS 3 BP 743 EP 751 PG 9 SC Neurosciences GA 620FV UT ISI:000179524100010 ER PT J AU Prokunina, L Castillejo-Lopez, C Oberg, F Gunnarsson, I Berg, L Magnusson, V Brookes, AJ Tentler, D Kristjansdottir, H Grondal, G Bolstad, AI Svenungsson, E Lundberg, I Sturfelt, G Jonssen, A Truedsson, L Lima, G Alcocer-Varela, J Jonsson, R Gyllensten, UB Harley, JB Alarcon-Segovia, D Steinsson, K Alarcon-Riquelme, ME TI A regulatory polymorphism in PDCD1 is associated with susceptibility to systemic lupus erythematosus in humans SO NATURE GENETICS LA English DT Article ID ALLELE-SPECIFIC HYBRIDIZATION; SIB-PAIR FAMILIES; HUMAN PD-1 GENE; AUTOIMMUNE-DISEASES; CROHNS-DISEASE; T-LYMPHOCYTES; EXPRESSION; IMMUNORECEPTOR; TOLERANCE; PEDIGREES AB Systemic lupus erythematosus (SLE, OMIM 152700) is a complex autoimmune disease that affects 0.05% of the Western population, predominantly women(1-4). A number of susceptibility loci for SLE have been suggested in different populations, but the nature of the susceptibility genes and mutations is yet to be identified(5-9). We previously reported a susceptibility locus (SLEB2) for Nordic multi-case families(9,10). Within this locus, the programmed cell death 1 gene (PDCD1, also called PD-1) was considered the strongest candidate for association with the disease(11-14). Here, we analyzed 2,510 individuals, including members of five independent sets of families as well as unrelated individuals affected with SLE, for single-nucleotide polymorphisms (SNPs) that we identified in PDCD1. We show that one intronic SNP in PDCD1 is associated with development of SLE in Europeans (found in 12% of affected individuals versus 5% of controls; P=0.00001, r.r. (relative risk)=2.6) and Mexicans (found in 7% of affected individuals versus 2% of controls; P=0.0009, r.r.=3.5). The associated allele of this SNP alters a binding site for the runt-related transcription factor 1 (RUNX1, also called AML1) located in an intronic enhancer, suggesting a mechanism through which it can contribute to the development of SLE in humans. C1 Univ Uppsala, Rudbeck Labs, Inst Genet & Pathol, Med Genet Sect, S-75185 Uppsala, Sweden. Everygene AB, Uppsala, Sweden. Univ Uppsala, Rudbeck Labs, Inst Genet & Pathol, Sect Pathol, S-75185 Uppsala, Sweden. Univ Uppsala, Evolut Biol Ctr, Dept Comparat Physiol, S-75185 Uppsala, Sweden. Karolinska Inst, Rheumatol Unit, Stockholm, Sweden. Karolinska Inst, Ctr Microbiol & Tumor Biol, Stockholm, Sweden. Karolinska Inst, Ctr Genom & Bioinformat, Stockholm, Sweden. Labdpitalinn, Dept Rheumatol, Reykjavik, Iceland. Labdpitalinn, Ctr Rheumatol Res, Reykjavik, Iceland. Univ Bergen, Broegelmann Res Lab, Bergen, Norway. Haukeland Univ Hosp, Ctr Med Genet & Mol Med, N-5021 Bergen, Norway. Univ Lund Hosp, Dept Clin Immunol, S-22185 Lund, Sweden. Univ Lund Hosp, Dept Rheumatol, S-22185 Lund, Sweden. Inst Nacl Ciencias Med & Nutr Salvador Zubirdan, Dept Immunol & Rheumatol, Mexico City, DF, Mexico. Univ Oklahoma, Dept Med, Arthrit & Immunol Program, Oklahoma Med Res Fdn, Oklahoma City, OK USA. US Dept Vet Affairs, Oklahoma City, OK USA. RP Alarcon-Riquelme, ME, Univ Uppsala, Rudbeck Labs, Inst Genet & Pathol, Med Genet Sect, Dag Hammarsjolds Vag 20, S-75185 Uppsala, Sweden. CR ANDREWS NC, 1991, NUCLEIC ACIDS RES, V19, P2499 ARNETT FC, 1992, RHEUM DIS CLIN N AM, V18, P865 BOMBARDIER C, 1992, ARTHRITIS RHEUM, V35, P630 FINGER LR, 1997, GENE, V197, P177 GAFFNEY PM, 1998, P NATL ACAD SCI USA, V95, P14875 GAFFNEY PM, 2000, AM J HUM GENET, V66, P547 GOODNOW CC, 2001, LANCET, V357, P2115 GUDMUNDSSON S, 1990, J RHEUMATOL, V17, P1162 HOWELL WM, 1999, NAT BIOTECHNOL, V17, P87 HUGOT JP, 2001, NATURE, V411, P599 LATHROP GM, 1983, TISSUE ANTIGENS, V22, P160 LAWRENCE RC, 1998, ARTHRITIS RHEUM, V41, P778 LICHTER P, 1988, HUM GENET, V80, P224 LINDQVIST AKB, 2000, J AUTOIMMUN, V14, P169 LUTTERBACH B, 2000, GENE, V245, P223 MAGNUSSON V, 2000, GENOMICS, V70, P307 MARTIN ER, 2000, AM J HUM GENET, V67, P146 MOSER KL, 1998, P NATL ACAD SCI USA, V95, P14869 NISHIMURA H, 1999, IMMUNITY, V11, P141 NISHIMURA H, 2001, TRENDS IMMUNOL, V22, P265 OGURA Y, 2001, NATURE, V411, P603 PRINCE JA, 2001, GENOME RES, V11, P152 SHAI R, 1999, HUM MOL GENET, V8, P639 SHINOHARA T, 1994, GENOMICS, V23, P704 STAHLHALLENGREN C, 2000, J RHEUMATOL, V27, P685 TAN EM, 1982, ARTHRITIS RHEUM, V25, P1271 THOMSON G, 1995, AM J HUM GENET, V57, P487 VIBHAKAR R, 1997, EXP CELL RES, V232, P25 WONG HK, 1999, J IMMUNOL, V163, P1682 NR 29 TC 145 PU NATURE AMERICA INC PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 USA SN 1061-4036 J9 NAT GENET JI Nature Genet. PD DEC PY 2002 VL 32 IS 4 BP 666 EP 669 PG 4 SC Genetics & Heredity GA 621MH UT ISI:000179593000022 ER PT J AU Gerrish, P TI Computational biology - Evolution plays dice SO NATURE LA English DT Editorial Material ID 10,000-GENERATION EXPERIMENT; ADAPTATION C1 Inst Mexicano Petr, Programa Invest Matemat Aplicadas & Computac, Mexico City 07730, DF, Mexico. RP Gerrish, P, Inst Mexicano Petr, Programa Invest Matemat Aplicadas & Computac, Col SAn Bartolo Atepehuacan, Mexico City 07730, DF, Mexico. CR APPENZELLER T, 1999, SCIENCE, V284, P2108 BOUCHER CAB, 1992, J INFECT DIS, V165, P105 LENSKI RE, 1994, P NATL ACAD SCI USA, V91, P6808 PAPADOPOULOS D, 1999, P NATL ACAD SCI USA, V96, P3807 WAHL LM, 2000, GENETICS, V156, P1437 WICHMAN HA, 1999, SCIENCE, V285, P422 WRIGHT S, 1931, GENETICS, V16, P97 YEDID G, 2002, NATURE, V420, P810 ZIMMER C, 2001, NAT HIST MAY, P42 NR 9 TC 0 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD DEC 26 PY 2002 VL 420 IS 6917 BP 756 EP 757 PG 3 SC Multidisciplinary Sciences GA 626WR UT ISI:000179897300041 ER PT J AU Castellanos, M Diaz, AI Terlevich, E TI A comprehensive study of reported high-metallicity giant HII regions - II. Ionizing stellar populations SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE stars : Wolf-Rayet; HII regions; galaxies : abundances; galaxies : stellar content ID STAR-FORMING REGIONS; PHYSICAL PARAMETERS; MASSIVE STARS; GALAXIES; SPECTROSCOPY; EVOLUTION; MODELS; ABUNDANCES; CLUSTERS; NEBULAE AB The ionizing stellar populations of 11 H II regions in the spiral galaxies: NGC 628, 925, 1232 and 1637, all of them reported to have solar or oversolar abundances according to empirical calibrations, have been analysed using stellar population synthesis models. Four of the observed regions in the sample show features which indicate the presence of a population of Wolf-Rayet (WR) stars with ages between 2.3 and 4.1 Myr. This population is sufficient to explain the emission line spectrum of the low-metallicity region H13 in NGC 628, taking into account the uncertainties involved in both observations and model computations. This is not the case for the rest of the regions for which a second ionizing population is required to simultaneously reproduce both the WR features and the emission line spectrum. Composite populations are also found for half of the regions without WR features, although in this case, the result is based only on the emission line spectrum analysis. For two of the regions showing WR features, no consistent solution is found, as the population containing WR stars produces a spectral energy distribution which is too hard to explain the emission of the gas. Several solutions are proposed to solve this problem. C1 Univ Autonoma Madrid, Dipartimento Fis Teor, E-28049 Madrid, Spain. INAOE, Puebla 72000, Mexico. RP Castellanos, M, Univ Autonoma Madrid, Dipartimento Fis Teor, C-XI, E-28049 Madrid, Spain. CR BRESOLIN F, 1999, ASTROPHYS J 1, V510, P104 CAMPBELL A, 1986, MON NOT R ASTRON SOC, V223, P811 CASTELLANOS M, 2002, ASTROPHYS J 2, V565, L79 CASTELLANOS M, 2002, MON NOT R ASTRON SOC, V329, P315 CERVINO M, 1994, A A, V284, P749 CROWTHER PA, 1999, ASTRON ASTROPHYS, V350, P1007 DIAZ AI, 1991, MON NOT R ASTRON SOC, V253, P245 DIAZ AI, 1998, ASTROPHYS SPACE SCI, V263, P143 DIAZ AI, 2000, MON NOT R ASTRON SOC, V311, P120 DIAZ AI, 2000, MON NOT R ASTRON SOC, V318, P462 ESTEBAN C, 1993, ASTRON ASTROPHYS, V272, P299 FERLAND GJ, 1999, INTERNAL REPORT HAZY GARCIAVARGAS ML, 1995, ASTRON ASTROPHYS SUP, V112, P13 GARCIAVARGAS ML, 1997, ASTROPHYS J 1, V478, P112 HODGE PW, 1976, ASTROPHYS J, V205, P728 KENNICUTT RC, 1980, ASTROPHYS J, V241, P573 KENNICUTT RC, 1983, ASTROPHYS J, V272, P54 KURUCZ RL, 1992, P IAU S, V149, P225 LEITHERER C, 1995, APJS, V96, P9 LEITHERER C, 1997, ASTROPHYS J 1, V481, P898 LEITHERER C, 1999, ASTROPHYS J SUPPL S, V123, P3 LEJEUNE T, 1997, ASTRON ASTROPHYS SUP, V125, P229 MAEDER A, 1994, ASTRON ASTROPHYS, V287, P803 MAYYA YD, 1996, ASTRON J, V111, P1252 MEYNET G, 1994, ASTRON ASTROPHYS SUP, V103, P97 MIHALAS D, 1972, ASTROPHYS J, V176, P139 OSTERBROCK DE, 1989, ASTROPHYSICS GASEOUS PAGEL BEJ, 1979, MON NOT R ASTRON SOC, V189, P95 PANAGIA N, 1973, AJ, V78, P929 PASTORIZA MG, 1993, MON NOT R ASTRON SOC, V260, P177 PEREZ E, 1997, MON NOT R ASTRON SOC, V290, P465 SCHAERER D, 1997, ASTRON ASTROPHYS, V322, P598 SCHAERER D, 1998, ASTROPHYS J 1, V497, P618 SCHMUTZ W, 1992, PASP, V104, P1164 SELMAN F, 1999, ASTRON ASTROPHYS, V347, P532 SHIELDS JC, 1995, ASTROPHYS J, V454, P807 SMITH LF, 1991, P IAU S, V148, P267 VACCA WD, 1992, APJ, V401, P5 VANZEE L, 1998, ASTRON J, V116, P2805 VILCHEZ JM, 1988, MNRAS, V231, P257 NR 40 TC 3 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0035-8711 J9 MON NOTIC ROY ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD DEC PY 2002 VL 337 IS 2 BP 540 EP 552 PG 13 SC Astronomy & Astrophysics GA 619TT UT ISI:000179494100016 ER PT J AU Cavazos-Cadena, R TI Value iteration and approximately optimal stationary policies in finite-state average Markov decision chains SO MATHEMATICAL METHODS OF OPERATIONS RESEARCH LA English DT Article DE successive approximations; Markov decision processes; Schweitzer's transformation; optimality equation; convergence of the value iteration approximations ID COST CRITERION AB This work concerns finte-state Markov decision chains endowed with the long-run average reward criterion. Assuming that the optimality equation has a solution, it is shown that a nearly optimal stationary policy, as well as an approximation to the optimal average reward within a specified error, can be obtained in a finite number of steps of the value iteration method. These results extend others already available in the literature, which were established under more stringent restrictions on the ergodic structure of the decision process. C1 Univ Anatoma Agraria Antonio Narro, Dept Estadistica Calculo, Saltillo 25315, Coahuila, Mexico. Univ Autonoma Coahuila, Ctr Invest Socioecon, Saltillo 25315, Coahuila, Mexico. RP Cavazos-Cadena, R, Univ Anatoma Agraria Antonio Narro, Dept Estadistica Calculo, Saltillo 25315, Coahuila, Mexico. CR ARAPOSTATHIS A, 1993, SIAM J CONTROL OPTIM, V31, P282 BORKAR VK, 1984, SIAM J CONTROL OPTIM, V21, P965 CAVAZOSCADENA R, 1996, SIAM J CONTROL OPTIM, V34, P1848 CAVAZOSCADENA R, 2001, MATH METHOD OPER RES, V54, P63 FEDERGRUEN A, 1978, J APPL PROBAB, V15, P356 FEDERGRUEN A, 1981, J OPTIMIZ THEORY APP, V34, P207 HERNANDEZLERMA O, 1988, ADAPTIVE MARKOV CONT HINDERER K, 1970, LECT NOTES OPERATION, V33 LOEVE M, 1977, PROBABILITY THEORY, V1 PUTERMAN ML, 1990, HDB OPERATIONS RES M, V2, P331 PUTERMAN ML, 1994, MARKOV DECISION PROC ROSS SM, 1970, APPL PROBABILITY MOD SCHWEITZER PJ, 1971, J MATH ANAL APPL, V34, P495 THOMAS LC, 1980, RECENT ADV MARKOV DE NR 14 TC 2 PU PHYSICA-VERLAG GMBH & CO PI HEIDELBERG PA TIERGARTENSTRASSE 17, 69121 HEIDELBERG, GERMANY SN 1432-2994 J9 MATH METHODS OPER RES JI Math. Method Oper. Res. PD NOV PY 2002 VL 56 IS 2 BP 181 EP 196 PG 16 SC Mathematics, Applied; Operations Research & Management Science GA 620HB UT ISI:000179527000003 ER PT J AU Pfeiffer, H Bosch, P Bulbulian, S TI Zr alkoxide chain effect on the sol-gel synthesis of lithium metazirconate SO MATERIALS CHEMISTRY AND PHYSICS LA English DT Article DE lithium zirconate; sol-gel; XRD; zirconium alkoxide ID FUSION-REACTOR BLANKET AB Lithium metazirconate (Li2ZrO3) was synthesized by the sol-gel method, using four different Zr alkoxides: zirconium ethoxide, zirconium iso-propoxide, zirconium propoxide and zirconium butoxide. The syntheses were made under two different catalytic regimes, acid and basic. The resulting powders were mixtures of Li2ZrO3 and ZrO2. The best yield of Li2ZrO3 (100%) was obtained when the sol-gel reaction was developed with lithium methoxide and zirconium ethoxide under acid catalysis regime. This study establishes that, for base-catalyzed reactions the ZrO2 formation decreases when the alkyl-chain increases in the alkoxides. By contrast, for acid-catalyzed reactions the ZrO2 formation increases as the alkyl-chain increases. Finally, when Zr propoxide and Zr iso-propoxide were used, the Li2ZrO3 amounts were different due to steric effects. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England. Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico. Inst Nacl Invest Nucl, Dept Quim, Mexico City 11801, DF, Mexico. RP Pfeiffer, H, Univ Cambridge, Dept Mat Sci & Met, Pembroke St, Cambridge CB2 3QZ, England. CR BOILOT JP, 1988, SUPERIONIC CONDUCTOR BRINKER CJ, 1990, SOL GEL SCI PHYSICS CHARPIN J, 1989, FUSION ENG DES, V8, P407 DASH S, 1996, J NUCL MATER, V228, P83 JOHNSON CE, 1981, J NUCL MATER, V103, P547 JOHNSON CE, 1988, J NUCL MATER A, V155, P188 JOHNSON CE, 1997, J NUCL MATER, V248, P91 JOHNSON CE, 1999, J NUCL MATER, V270, P212 LIVAGE J, 1986, J SOLID STATE CHEM, V64, P322 MONTANARO L, 1992, J MATER SCI, V27, P3763 PFEIFFER H, 1998, J NUCL MATER, V257, P309 PFEIFFER H, 2000, J MATER CHEM, V10, P1255 PFEIFFER H, 2000, J MATER RES, V15, P1490 SEGAL D, 1991, CHEM SOLID STATE MAT WYERS GP, 1989, J NUCL MATER, V168, P24 NR 15 TC 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0254-0584 J9 MATER CHEM PHYS JI Mater. Chem. Phys. PD FEB 17 PY 2002 VL 78 IS 2 BP 558 EP 561 PG 4 SC Materials Science, Multidisciplinary GA 621BU UT ISI:000179569300043 ER PT J AU Racotta, IS Palacios, E Mendez, L TI Metabolic responses to short and long-term exposure to hypoxia in white shrimp (Penaeus vannamei) SO MARINE AND FRESHWATER BEHAVIOUR AND PHYSIOLOGY LA English DT Article DE anaerobic; carbohydrates; copper; hemocyanin; oxygen; protein ID DISSOLVED-OXYGEN; SUBSEQUENT RECOVERY; NEPHROPS-NORVEGICUS; ENERGY-METABOLISM; AMMONIA EXCRETION; CRUSTACEA; LACTATE; ANOXIA; BLOOD; WATER AB Anaerobic metabolism and oxygen carrying-capacity of white shrimp ( Penaeus vannamei ) exposed to short term (three days) and long term (two weeks) moderate hypoxia (2-2.6 mg/L) was investigated. Glucose and lactate levels in hemolymph increased under both hypoxic conditions, indicating an activation of anaerobic pathways during the two-weeks exposure period. In muscle, no differences of glucose and lactate levels were observed between the control group and the exposed groups. In animals exposed to hypoxia for two weeks, hemocyanin and copper in hemolymph were higher than in animals under normoxic conditions or exposed for three days. These results indicate that an increase in oxygen carrying-capacity in shrimp is evident only after a sustained condition of hypoxia. Copper levels in the hepatopancreas decreased in both hypoxic conditions, suggesting a mobilization of copper stores for hemocyanin synthesis. These results indicate that penaeid shrimp can tolerate moderate hypoxic conditions by physiological adaptations, such as anaerobic metabolism and increased oxygen carrying-capacity. These adaptations require an adequate dietary supply of proteins and copper for hemocyanin synthesis and of carbohydrates for anaerobic metabolism. C1 Ctr Invest Bil Noroeste, Programa Acuiculture, La Paz 23000, BCS, Mexico. RP Racotta, IS, Ctr Invest Bil Noroeste, Programa Acuiculture, Apdo Postal 128, La Paz 23000, BCS, Mexico. CR ALBERT JL, 1985, J EXP ZOOL, V234, P175 ANDERSON SJ, 1994, COMP BIOCHEM PHYS A, V108, P515 BRADFORD MM, 1976, ANAL BIOCHEM, V72, P248 BRIDGES CR, 1980, COMP BIOCH PHYSL A, V65, P399 GADE G, 1984, COMP BIOCHEM PHYS A, V77, P495 HAGERMAN L, 1981, J EXP MAR BIOL ECOL, V54, P13 HAGERMAN L, 1985, MAR BIOL, V87, P273 HAGERMAN L, 1986, COMP BIOCHEM PHYS A, V85, P721 HAGERMAN L, 1990, COMP BIOCHEM PHYS A, V97, P51 LIAO IC, 1986, P 1 AS FISH FOR AS F, P641 MARTINEZPAKACIO.CA, 1996, J AQUA TROP, V11, P59 OCAMPO L, 2000, AQUAC RES, V31, P167 PATERSON BD, 1993, COMP BIOCHEM PHYS B, V106, P395 ROSAS C, 1998, MAR ECOL-PROG SER, V174, P67 ROSAS C, 1999, J EXP MAR BIOL ECOL, V234, P41 SEIDMAN ER, 1985, J WORLD MARICULT SOC, V16, P333 SENKBEIL EG, 1981, COMP BIOCHEM PHYS B, V68, P163 TAYLOR AC, 1987, MAR BIOL, V95, P521 TAYLOR HH, 1999, MAR FRESHWATER RES, V50, P907 VANAARDT WJ, 1988, COMP BIOCH PHYSL A, V91, P299 VARGASALBORES F, 1993, COMP BIOCHEM PHYS A, V106, P299 VOGT G, 1994, AQUAT TOXICOL, V28, P223 ZOU EM, 1996, COMP BIOCHEM PHYS A, V114, P105 NR 23 TC 1 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0091-181X J9 MAR FRESHW BEHAV PHYSIOL JI Mar. Freshw. Behav. Physiol. PY 2002 VL 35 IS 4 BP 269 EP 275 PG 7 SC Marine & Freshwater Biology GA 622EL UT ISI:000179633500007 ER PT J AU Diop, CAK Bassene, S Sidibe, M Sarr, AD Diop, L Molloy, KC Mahon, MF Toscano, RA TI Synthesis, characterization and X-ray structures of catena triphenyltin(IV) benzenesulphonate, catena-trimethyltin(IV) methylphosphonate and catena-trimethyltin(IV) phenylarsenate SO MAIN GROUP METAL CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE; MOSSBAUER; ORGANOTIN; CHEMISTRY; NMR; IR AB The crystal and spectroscopic characterization of three triorganotin derivatives, namely [Ph3SnO3SPh](n), [Me3SnO2P(OH)(Me)](n) and [Me3SnO2As(OH)(Ph)](n) are reported. In each case the structure consists of one- or three-dimensional, polymeric chains involving R3Sn (R = Me, Ph) moieties axially bridged through either benzenesulphonato, methylphosphonato or phenylarsonato ligands. The tin atoms in each case are in a trans-O2SnC3 trigonal bipyramidal environment. Hydrogen bonds ensure the compactness of the structures of the methylphosphonato and phenylarsonato derivatives. C1 Univ Cheikh Anta Diop, Fac Sci & Tech, Dept Chem, Lab Chim Mineral & Analyt,LACHIMIA, Dakar, Senegal. Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England. Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico. RP Diop, CAK, Univ Cheikh Anta Diop, Fac Sci & Tech, Dept Chem, Lab Chim Mineral & Analyt,LACHIMIA, Dakar, Senegal. 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Chem. PY 2002 VL 25 IS 11 BP 683 EP 689 PG 7 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic GA 621MT UT ISI:000179594200007 ER PT J AU Ortiz, RMA Galina, MA Carmona, MMA TI Effect of a slow non-protein nitrogen ruminal supplementation on improvement of Cynodon nlemfuensis or Brachiaria brizanta utilization by Zebu steers SO LIVESTOCK PRODUCTION SCIENCE LA English DT Article DE beef cattle; feeding and nutrition; nitrogen supplementation ID BARLEY STRAW; FEED-INTAKE; CATTLE; UREA; DIGESTIBILITY; LIVEWEIGHT; ROUGHAGES; PASTURE; DIETS; SHEEP AB An observation was carried out over 120 days to measure the effect of slow intake urea supplementation on Zebu steers grazing on Star (Cynodon nwlemfuensis) or Insurgent (Brachiaria brizanta) grass in the dry season. In experiment A (treatment 1): 40 steers (213+/-6 kg BW) grazing Cynodon were supplemented with 1.8 kg DM of slow intake urea supplement (SIUS). This supplement was a mixture of molasses (16.0%), urea (4.0%), salt (3.0%), orthophosphate (2.0%), limestone (3.0%), cottonseed meal (22.0%), rice polishing (12.0%), corn (11.0%), poultry litter (9.0%), mineral salts (1.5%), ammonium sulfate (0.5%), fish meal (3.0%), cement kiln dust (2.0%) and animal lard (11.0%). Steers in treatment 2 (n = 12; 214+/-4 kg BW) grazing Cynodon were supplemented with 2.7 kg DM of commercial concentrate (CC). It was made up of 28.0% corn, 38.0% wheat flour, 5.0% fishmeal, 25.0% cottonseed meal, 2.0% orthophosphate and 2.0% mineral salts. In experiment B (treatment 1), there were 40 steers (214 6 kg BW) grazing Brachiaria supplemented with 1.8 kg DM SIUS. In the second treatment, there were 12 animals (217+/-4 kg BW) grazing Brachiaria plus 2.7 kg DM CC. Each group had a ruminal fistulated animal to measure intake. All steers were under intensive mobile grazing. Stocking rates varied from 3.6 to 5.9 AU/ha and instant stocking rate from 57.0 to 93.3 AU/ha. At all times, grass was available exceeding the VDMI. Results were analyzed by ANOVA (P < 0.05). Analysis among treatments was performed with the Schaffe test (a = 0.05). Results in experiment A show body weight gains (BWG) of 851+/-15 g/day for treatment 1; 819+/-29 g/day were obtained in treatment 2; 910+/-21 and 843+/-32 g/day for the animals in experiment B: treatment 1 and 2, respectively. Only experiment B showed statistical differences (P < 0.05). VDMI was 3 and 2.7% BW for treatments 1 and 2 in the experiment A, and 3.2 and 2.8% BW for treatment 1 and 2 in experiment B. In the present study, SIUS was successfully used as supplement made with local feeds to steers grazed on regional forages on a profitable performance. Supplementation of 1.8 kg/M SIUS amounted to US$0.34 compared with 2.7 kg/DM CC added at US$0.63 per day. (C) 2002 Published by Elsevier Science B.V. C1 Univ Nacl Autonoma Mexico, Fac Estudios Super Cuautitlan, Dept Ciencias Pecuaris, Cuautitlan 54720, Mexico. Univ Aberdeen, Aberdeen, Scotland. RP Galina, MA, Univ Nacl Autonoma Mexico, Fac Estudios Super Cuautitlan, Dept Ciencias Pecuaris, Campo 4,Carretera Cuautitlan Teoloyucan Km 3-5, Cuautitlan 54720, Mexico. 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Prod. Sci. PD DEC 2 PY 2002 VL 78 IS 2 BP 125 EP 131 PG 7 SC Agriculture, Dairy & Animal Science GA 621PB UT ISI:000179597400006 ER PT J AU Marquez, LA Moog, C Velasco-Villa, M TI Observatility and observers for nonlinear systems with time delays SO KYBERNETIKA LA English DT Article ID CONTROLLER AB Basic properties on linearization by output injection are investigated in this paper. A special structure is sought which is linear up to a suitable output injection and under a suitable change of coordinates. It is shown how an observer may be designed using theory available for linear time delay systems. C1 CICESE, Dept Elect & Telecommun, San Diego, CA 92143 USA. CNRS, UMR 6597, IRCCyN, F-44321 Nantes 3, France. Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Elect Engn, Mechatron Sect, Mexico City 07000, DF, Mexico. RP Marquez, LA, CICESE, Dept Elect & Telecommun, POB 434944, San Diego, CA 92143 USA. CR AGGOUNE W, 1999, P 38 IEEE C DEC CONT ANTONIADES C, 1999, INT J MATH COMP SCI, V9, P811 BOCHAROV GA, 2000, J COMPUT APPL MATH, V125, P183 CONTE G, 1995, SIAM J CONTROL OPTIM, V33, P750 FLIESS M, 1998, ESAIM CONTR OPTIM CA, V3, P301 GERMANI A, 1997, S MODELING ANAL SIM, P599 GERMANI A, 1998, P 6 IEEE MED C CONTR HALE J, 1977, THEORY FUNCTIONAL DI HALE J, 1993, INTRO FUNCTIONAL DIF HE JB, 2000, CHEM ENG SCI, V55, P2429 KOLMANOVSKII VB, 1986, STABILITY FUNCTIONAL KOLMANOVSKII VB, 1998, 1 IFAC INT WORKSH LI, P75 KRENER AJ, 1983, SYST CONTROL LETT, V3, P47 KRENER AJ, 1985, SIAM J CONTROL OPTIM, V23, P197 LEE EB, 1981, INT J CONTROL, V34, P1061 LEE Y, 2000, CHEM ENG SCI, V55, P3481 MALEKZAVAREI M, 1987, N HOLLAND SYSTEMS CO, V9 MARQUEZMARTINEZ LA, 1999, P 38 IEEE C DEC CONT MARQUEZMARTINEZ LA, 2000, ACCESSIBILITY FEEDBA MARQUEZMARTINEZ LA, 2001, P 40 IEEE C DEC CONT MOOG CH, 2000, IEEE T AUTOMATIC CON, V48, P305 PICARD P, 1996, THESIS U NATES PLESTAN F, 1995, THESIS U NATES ECOLE XIA X, 1996, P 35 IEEE C DEC CONT NR 24 TC 0 PU KYBERNETIKA PI PRAGUE 8 PA POD VODARENSKOU VEZI 4, PRAGUE 8 182 08, CZECH REPUBLIC SN 0023-5954 J9 KYBERNETIKA JI Kybernetika PY 2002 VL 38 IS 4 BP 445 EP 456 PG 12 SC Computer Science, Cybernetics GA 621TX UT ISI:000179608100004 ER PT J AU Ramirez, FD Varbanov, S Cecile, C Muller, G Fatin-Rouge, N Scopelliti, R Bunzli, JCG TI A p-tert-butylcalix[6]arene bearing phosphinoyl pendant arms for the complexation and sensitisation of lanthanide ions SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID MOLECULAR-STRUCTURE; NMR-SPECTROSCOPY; CALIXARENES; CALIX<4>ARENES; EXTRACTION; RIM; PARA-TERT-BUTYLCALIX<6>ARENE; CALIX<6>ARENES; CONFORMATION; SEPARATIONS AB The new lower rim functionalised macrocycle 5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41,42-hexakis(dimethylphosp hinoylmethoxy)calix[6]arene (B(6)bL(6)) has been synthesised. Temperature dependent H-1 and P-31 NMR studies indicate a mixture of conformers with a time-averaged C-6v, symmetry at 405 K in dmso-d(6); DeltaGdouble dagger values for conformational interconversion processes are equal to 68(1) and 75(2) kJ mol(-1) and reveal a semi-flexible macrocycle with alternate in-out cone conformation, a fact confirmed by molecular mechanics and dynamics calculations. B(6)bL(6) crystallises as a dimer where the two calixarenes are linked through hydrogen bonding and surrounded by water and toluene molecules in the lattice. UV-Vis spectrophotometric titration of B(6)bL(6) with La(III) in acetonitrile yields stability constants logbeta(1) = 9.8 and logbeta(2) = 19.6 for the 1 : 1 and 1 : 2 (Ln : B(6)bL(6)) species, respectively. The corresponding complexes with La, Eu, Gd and Tb have been isolated and characterised. Lifetime determinations of the Eu(III) and Tb(III) complexes in acetonitrile solution are consistent with no or little interaction of water molecules in the inner co-ordination sphere. The new ligand sensitises reasonably well the luminescence of the Tb(III) (Q(abs) = 4.8%, tau(f) = 2.1 ms, 1 : 1 complex) and Eu(III) (Q(abs) = 2.5%, tau = 2.0 ms, 1 : 2 complex) ions. C1 Swiss Fed Inst Technol, Inst Mol & Biol Chem, CH-1015 Lausanne, Switzerland. Inst Nacl Invest Nucl, Dept Quim, Mexico City 52045, DF, Mexico. Bulgarian Acad Sci, Inst Polymer, BG-1113 Sofia, Bulgaria. RP Bunzli, JCG, Swiss Fed Inst Technol, Inst Mol & Biol Chem, BCH 1402, CH-1015 Lausanne, Switzerland. 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Chem. Soc.-Dalton Trans. PY 2002 IS 23 BP 4505 EP 4513 PG 9 SC Chemistry, Inorganic & Nuclear GA 620UR UT ISI:000179551300029 ER PT J AU Batle, J Casas, M Fortes, M de Llano, M Tolmachev, VV TI Generalizing BCS for exotic superconductors SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE Boson-fermion models; BCS theory; Bose-Einstein condensation; exotic superconductors ID 2-COMPONENT SUPERCONDUCTIVITY; BOSE-EINSTEIN; COOPER PAIRS AB A new boson-fermion statistical model with two-hole (h) as well as two-electron (e) Cooper pairs (CP) exhibiting Bose-Einstein condensation (BEC)-which simultaneously reduces to BCS theory in weak coupling for perfect eh symmetry and to BEC when no hole CPs are present-yields reasonable transition temperatures for exotic superconductors, whether quasi-2D cuprate or 3D ones, for moderate departures from perfect eh symmetry. C1 Univ Illes Balears, Dept Fis, E-07071 Palma de Mallorca, Spain. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 01000, DF, Mexico. Baumann State Tech Univ, Moscow, Russia. RP Batle, J, Univ Illes Balears, Dept Fis, E-07071 Palma de Mallorca, Spain. 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PD DEC PY 2002 VL 15 IS 6 BP 655 EP 657 PG 3 SC Physics, Applied; Physics, Condensed Matter GA 619UM UT ISI:000179495900032 ER PT J AU Escamilla, R Gallardo-Amores, JM Moran, E Alario-Franco, MA TI Crystal chemistry and magnetic properties of SeCu1-xZnxO3 (0-<= x <= 1) perovskites SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article DE perovskites; selenites; high pressure; copper oxides; ferromagnetism; Rietveld refinement ID OXIDES AB The effects of zinc substitution in the structural and magnetic properties of the orthorhombic solid solution SeCu1-xZnxO3 have been studied. Rietveld refinements of the X-ray diffraction patterns indicate that the zinc ions occupy the copper sites. This replacement induces some changes in the Cu-O bond lengths and [Cu-O-Cu] bond angles. Magnetization vs temperature measurements show a fast decrease in the Weiss constant that reveals a direct quadratic relationship with the increase of the average [Cu-O-Cu] bond angle. Besides, the introduction of a non-magnetic cation in the B-positions in the structure of SeCu1-xZnO3 system, progressively decreases the ferromagnetic interactions. (C) 2002 Elsevier Science (USA). C1 Univ Complutense, Fac Ciencias Quim, Dept Quim Inorgan, Lab Complutense Altas Presiones, Madrid 28040, Spain. Natl Autonomous Univ Mexico, Inst Invest & Mat, Mexico City 04510, DF, Mexico. RP Alario-Franco, MA, Univ Complutense, Fac Ciencias Quim, Dept Quim Inorgan, Lab Complutense Altas Presiones, Madrid 28040, Spain. CR ANDERSON PW, 1950, PHYS REV, V79, P705 BLASCO J, 2000, PHYS REV B, V62, P9 DURRANT PJ, 1962, GEN INORGANIC CHEM, P647 GALASSO FS, 1990, PEROVSKITES HIGH TC GALY J, 1975, J SOLID STATE CHEM, V13, P142 GARCIAMUNOZ JL, 1996, J PHYS-CONDENS MAT, V8, L787 GELLER S, 1956, ACTA CRYSTALLOGR, V9, P563 GELLER S, 1956, J CHEM PHYS, V24, P1236 GOODENOUGH JB, 1955, PHYS REV, V100, P564 HANKE K, 1973, ACTA CRYSTALLOGR B, V29, P963 HE T, 2001, PHYS REV B, V63 HOWARD CJ, 1997, RIETICA IUCR POWDER, V22, P21 HYDE BG, 1989, INORGANIC CRYSTAL ST KANEMORI J, 1959, J PHYS CHEM SOLIDS, V10, P87 KENNEDY BJ, 1999, J PHYS-CONDENS MAT, V11, P1479 KISTENMACHER TJ, 1988, PHYS REV B, V38, P8862 KOHN K, 1976, J SOLID STATE CHEM, V18, P27 MAZIN II, 1997, PHYS REV B, V56, P2556 OKAZAKI A, 1961, J PHYS SOC JPN, V16, P176 RODRIGUEZMARTIN.LM, 2000, PHYS REV B, V63, P24424 SHANNON RD, 1976, ACTA CRYSTALLOGR A, V32, P751 SUBRAMANIAN MA, 1999, PHYS REV LETT, V82, P1558 TSUDA N, 1991, ELECT CONDUCTION OXI ZENER C, 1951, PHYS REV, V82, P403 NR 24 TC 2 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD OCT PY 2002 VL 168 IS 1 BP 149 EP 155 PG 7 SC Chemistry, Inorganic & Nuclear; Chemistry, Physical GA 620QN UT ISI:000179544200020 ER PT J AU Echevarria-Machado, I Munoz-Sanchez, A Loyola-Vargas, VM Hernandez-Sotomayor, SMT TI Spermine stimulation of phospholipase C from Catharanthus roseus transformed roots SO JOURNAL OF PLANT PHYSIOLOGY LA English DT Article DE Catharanthus roseus; phospholipase C; polyamines ID SOMATIC EMBRYOGENESIS; POLYAMINE METABOLISM; OSMOTIC-STRESS; ARABIDOPSIS-THALIANA; SIGNAL TRANSDUCTION; PLANT-GROWTH; CELLS; CARROT; DECARBOXYLASE; PURIFICATION AB Polyamines (Pas) are aliphatic amines that are ubiquitous in all living organisms and regulate a broad spectrum of physiological processes. It has been suggested that they can act through a signal transduction pathway. Using Catharanthus roseus hairy roots as a model we determined the levels of Pas throughout a culture cycle. We found that there is a peak in the intracellular concentration of Pas during the first six days of culture. The effect of Pas on phospholipase C (PLC) activity was also investigated. Putrescine, spermidine and spermine were added in vitro to the PLC assay. Putrescine did not modify PLC activity; spermidine inhibited the enzyme but at very high, non-physiological concentrations; and spermine increased the PLC activity four-fold at physiological concentrations. Our results suggest that spermine could regulate root growth by regulating the PLC signal transduction mechanism. C1 Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plantas, Merida 97310, Yuc, Mexico. Inst Nacl Ciencias Agr, Havana, Cuba. RP Hernandez-Sotomayor, SMT, Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plantas, Calle 43 130,Chuburna Hidalgo,Apdo,Postal 87,Cord, Merida 97310, Yuc, Mexico. CR ATHWAL GS, 2002, PLANT J, V29, P119 BABATSIKOS C, 2001, J PLANT PHYSIOL, V158, P167 BASTOLA DR, 1995, PLANT PHYSIOL, V109, P63 CHAPMAN KD, 1998, TRENDS PLANT SCI, V3, P419 CIAUUITZ R, 1994, IN VITRO CELL DEV-PL, V30, P84 COTE GG, 1993, ANNU REV PLANT PHYS, V44, P333 DELOSSANTOSBRIONES C, 1997, J PLANT PHYSIOL, V150, P707 DOBROVINSKAYA OR, 1999, J MEMBRANE BIOL, V167, P127 DUREJAMUNJAL I, 1992, PHYTOCHEMISTRY, V31, P1161 ELHADRAMI I, 1992, J PLANT PHYSIOL, V140, P33 FLORES H, 1982, SCIENCE, V217, P1259 FLORES HE, 1982, PLANT PHYSIOL, V69, P701 FLORES HE, 1984, PLANT PHYSIOL, V75, P102 GALSTON AW, 1990, PLANT PHYSIOL, V94, P406 GAMBORG OL, 1968, EXP CELL RES, V50, P151 HEBY O, 1990, TRENDS BIOCHEM SCI, V15, P153 HERNANDEZSOTOMAYOR SMT, 1999, PLANT PHYSIOL, V120, P1075 HIRAYAMA T, 1995, P NATL ACAD SCI USA, V92, P3903 HIRAYAMA T, 1997, PLANT MOL BIOL, V34, P175 HUANG CH, 1995, PLANT J, V8, P257 JARVIS BC, 1983, PLANT CELL PHYSIOL, V24, P677 KASHEM MA, 2000, PLANT CELL PHYSIOL, V41, P399 KOPKA J, 1998, PLANT PHYSIOL, V116, P239 KUMAR A, 1997, TRENDS PLANT SCI, V2, P124 KUROSAKI F, 1992, PHYTOCHEMISTRY, V31, P3889 LEE TM, 1997, PLANT SCI, V122, P111 LEHLE L, 1990, PLANT MOL BIOL, V15, P647 LIU K, 2000, PLANT PHYSIOL, V124, P1315 MAKI H, 1991, PLANT PHYSIOL, V96, P1008 MARTINTANGUY J, 1997, PHYSIOL PLANTARUM, V100, P675 MESSIAEN J, 1999, PLANTA, V208, P247 MINOCHA R, 1991, PLANT CELL REP, V10, P126 MINOCHA SC, 1991, PLANT CELL PHYSIOL, V32, P395 MUNNIK T, 1998, BBA-LIPID LIPID MET, V1389, P222 PINACHABLE ML, 1998, PROSTAG OTH LIPID M, V56, P19 SHI JR, 1995, PLANT J, V8, P381 SMITH PK, 1985, ANAL BIOCHEM, V150, P76 STEVENSON JM, 2000, TRENDS PLANT SCI, V5, P252 SUAREZSOLIS VM, 1999, PHYSIOL PLANTARUM, V105, P593 TABOR CW, 1984, ANNU REV BIOCHEM, V53, P749 THEISS C, 2002, PLANT PHYSIOL, V128, P1470 TIBURCIO AF, 1986, PLANT PHYSIOL, V82, P369 TIBURCIO AF, 1986, PLANT PHYSIOL, V82, P375 TIBURCIO AF, 1993, PLANT GROWTH REGUL, V12, P331 TIBURCIO AF, 1997, PHYSIOL PLANTARUM, V100, P664 WALDO GL, 1994, METHOD ENZYMOL, V238, P195 YAMAMOTO YT, 1995, PLANT PHYSIOL, V107, P1029 NR 47 TC 2 PU URBAN & FISCHER VERLAG PI JENA PA BRANCH OFFICE JENA, P O BOX 100537, D-07705 JENA, GERMANY SN 0176-1617 J9 J PLANT PHYSIOL JI J. Plant Physiol. PD NOV PY 2002 VL 159 IS 11 BP 1179 EP 1188 PG 10 SC Plant Sciences GA 621GW UT ISI:000179581200003 ER PT J AU Quiroz-Figueroa, F Mendez-Zeel, M Sanchez-Teyer, F Rojas-Herrera, R Loyola-Vargas, VM TI Differential gene expression in embryogenic and non-embryogenic clusters from cell suspension cultures of Coffea arabica SO JOURNAL OF PLANT PHYSIOLOGY LA English DT Editorial Material DE Coffea arabica; embryogenic cluster; non-embryogenic clusters; somatic embryogenesis ID SOMATIC EMBRYOS; SINGLE CELLS; PROTEINS; CARROT; CALLUS AB Somatic embryogenesis (SE) is a very useful system for studying the differentiation process in plants and involves gene regulation at several levels. During SE induction in Coffea arabica cv. Catura Rojo two types of cell clusters, embryogenic (EC) and non-embryogenic (NEC), were observed. The goal of this work was to compare the most relevant characteristics between EC and NEC for a better understanding of the mechanism driving SE. Morphohistological observations indicated a correlation between the morphological features of clusters and their embryogenic competence. On the other hand, no variation at the DNA level, studied by AFLP, were found to explain the disparity in embryogenic competence of clusters, but gene expression, observed by RNA differential display, and SDS-PAGE showed differences that can explain that disparity. Our results lead us to propose that differential gene expression can modulate the embryogenic; capacity of coffee cells and that the number of genes turned off in somatic cells to allow for the change from a somatic to an embryogenic state, is higher than those genes that are turned on. C1 Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plant, Merida 97200, Yucatan, Mexico. RP Loyola-Vargas, VM, Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plant, Calle 43 130,Colonia Chuburna Hidalgo, Merida 97200, Yucatan, Mexico. CR GROTKASS C, 1995, PLANT CELL REP, V14, P428 HERMAN EB, 1975, HORTSCIENCE, V10, P588 JIMENEZ VM, 2001, PLANT SCI, V160, P247 LAEMMLI UK, 1970, NATURE, V227, P680 LIANG P, 1992, SCIENCE, V257, P967 LOSCHIAVO F, 1989, THEOR APPL GENET, V77, P325 MENENDEZYUFFA A, 1994, PLANT CELL REP, V13, P197 MULLER E, 1990, THEOR APPL GENET, V80, P673 NEI M, 1979, P NATL ACAD SCI USA, V76, P5269 NOMURA K, 1985, PLANT PHYSIOL, V79, P988 PETERSON GL, 1977, ANAL BIOCHEM, V83, P346 QUIROZFIGUEROA FR, 2002, PLANT CELL REP, V20, P1141 ROJASHERRERA R, 2002, MOL BIOTECHNOL, V20, P43 SAITOU N, 1987, MOL BIOL EVOL, V4, P406 SONDAHL MR, 1991, 14 COLL SCI INT CAF, P701 STARITSKY G, 1970, ACTA BOT NEERL, V19, P509 STIRN S, 1987, PLANT CELL REP, V6, P50 SUNG ZR, 1981, P NATL ACAD SCI USA, V78, P3683 TAHARA M, 1995, 16 C SCI INT CAF KYO, P860 TOONEN MAJ, 1994, PLANTA, V194, P565 VANDENBULK RW, 1990, THEOR APPL GENET, V80, P817 VASIL V, 1981, AM J BOT, V68, P864 VOS P, 1995, NUCLEIC ACIDS RES, V23, P4407 WRAY W, 1981, ANAL BIOCHEM, V118, P197 NR 24 TC 2 PU URBAN & FISCHER VERLAG PI JENA PA BRANCH OFFICE JENA, P O BOX 100537, D-07705 JENA, GERMANY SN 0176-1617 J9 J PLANT PHYSIOL JI J. Plant Physiol. PD NOV PY 2002 VL 159 IS 11 BP 1267 EP 1270 PG 4 SC Plant Sciences GA 621GW UT ISI:000179581200015 ER PT J AU Carbaja-Tinoco, MD Ober, R Dolbnya, I Bras, W Williams, CE TI Structural changes and chain conformation of hydrophobic polyelectrolytes SO JOURNAL OF PHYSICAL CHEMISTRY B LA English DT Article ID HIGHLY-CHARGED POLYELECTROLYTES; POOR SOLVENTS; CONDENSATION AB A series of hydrophobic sodium poly(styrene-co-styrene sulfonate)'s of various charge fractions was studied by means of two combined techniques, static light scattering and small-angle X-rays scattering. The existence of structural changes as a function of the charge content was evidenced in the full scattering spectrum. By fitting the, experimental data with some known models, we were able to show that these hydrophobic polyelectrolytes have a Gaussian shape at large scales. Moreover, the correlation between characteristic lengths of different scales suggests that the small angle upturn of the most hydrophobic polyelectrolyte's could be related to the conformation of the chains. C1 Coll France, CNRS, UMR 7125, Phys Mat Condensee Lab, F-75231 Paris, France. Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Mexico City 07000, DF, Mexico. ESRF, Netherlands Org Sci Res, DUBBLE CRG ESRF, F-38043 Grenoble, France. RP Carbaja-Tinoco, MD, Coll France, CNRS, UMR 7125, Phys Mat Condensee Lab, 11 Pl Marcelin Berthelot, F-75231 Paris, France. CR BAIGL D, 2002, MACROMOLECULES, V35, P2318 BENOIT H, 1953, J PHYS CHEM-US, V57, P958 BOUE F, UNPUB BRAS W, 1998, J MACROMOL SCI PHY B, V37, P557 CARBAJALTINOCO MD, UNPUB CARBAJALTINOCO MD, 2000, EUROPHYS LETT, V52, P284 DEGENNES PG, 1976, J PHYS-PARIS, V37, P1461 DIAMANT H, 2000, MACROMOLECULES, V33, P8050 DOBRYNIN AV, 1996, MACROMOLECULES, V29, P2974 DOBRYNIN AV, 1999, MACROMOLECULES, V32, P915 ERMI BD, 1998, MACROMOLECULES, V31, P7378 ESSAFI W, UNPUB ESSAFI W, 1994, ACS S SERIES, V548 ESSAFI W, 1995, J PHYS II, V5, P1269 ESSAFI W, 1996, THESIS U PARIS 6 PAR ESSAFI W, 1999, EUR PHYS J B, V9, P261 GONZALEZMOZUELOS P, 1995, J CHEM PHYS, V103, P3145 HIGGINS JS, 1994, POLYM NEUTRON SCATTE KANTOR Y, 1994, EUROPHYS LETT, V27, P643 MAIER EE, 1992, MACROMOLECULES, V25, P1125 MAKOWSKI HS, 1975, 3870841, US MANNING GS, 1996, BER BUNSEN PHYS CHEM, V100, P909 MICKA U, 1999, LANGMUIR, V15, P4033 NISHIDA K, 2002, POLYMER, V43, P1295 OOSAWA F, 1969, POLYELECTROLYTES, V51, P924 SCHMITZ KS, 1994, ACS S SERIES, V548 SEDLAK M, 1993, MACROMOLECULES, V26, P1158 WILLIAMS CE, 2001, ELECTROSTATIC EFFECT NR 28 TC 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1520-6106 J9 J PHYS CHEM B JI J. Phys. Chem. B PD NOV 28 PY 2002 VL 106 IS 47 BP 12165 EP 12169 PG 5 SC Chemistry, Physical GA 620QJ UT ISI:000179543800013 ER PT J AU de la Torre, L Carrasco, D Mora, MA Ramirez, J Lopez, S TI Vascular malformations of the colon in children SO JOURNAL OF PEDIATRIC SURGERY LA English DT Article DE vascular malformations; vascular anomalies; gastrointestinal bleeding; rectal bleeding; endorectal pull-through; posterior sagittal approach ID ARTERIOVENOUS MALFORMATION; ANGIODYSPLASIA; HEMANGIOMAS; ANOMALIES; CHILDHOOD; RECTUM AB Purpose: The aim of this study was to evaluate clinical, radiologic, surgical, and histopathologic characteristics of vascular malformations of the colon (VMC) in children. Methods: Eighteen patients with lower intestinal bleeding (LIB) and VMC were included. Clinical data, angiographic features, surgical treatments, and histopathologic findings were analyzed. Results: Age of clinical onset was from 1 week to 16 years. Duration of LIB before diagnosis was from 1 month to 9 years. Admission hemoglobin level was 2 to 9 g/dL in 13 patients and in the other 5 was normal. Scintigraphy, colonoscopy, and barium enema results were normal or suggested a vascular problem. Mesenteric arteriography detected VMC in all 18 cases. Left hemicolon and rectum were affected in 83% of the cases. VMC were resected in 14 patients, 10 were anastomosed or pulled-through, and the other 4 required an intestinal stoma. Ten patients are asymptomatic, and 4 have minimal postoperative bleeding. The histopathologic study made in 15 cases (14 surgical specimens and 1 endoscopic biopsy), revealed arterial-venous VMC in 12 and arterial-venous-lymphatic VMC in 3 cases. Conclusions: The identification of VMC in children with LIB often is delayed. An early mesenteric arteriography should be added to the routine evaluation. Surgical treatment presents a challenge in rectal cases. To avoid confusion in the nomenclature a simplified morphologic classification is suggested. Copyright 2002, Elsevier Science (USA). All rights reserved. C1 Inst Nacl Pediat, Dept Cirugia, Clin Colon & Recto, Mexico City 04530, DF, Mexico. Inst Nacl Pediat, Dept Surg, Mexico City 04530, DF, Mexico. Inst Nacl Pediat, Dept Pathol, Mexico City 04530, DF, Mexico. Inst Nacl Pediat, Dept Radiol, Mexico City 04530, DF, Mexico. Inst Nacl Pediat, Dept Gastroenterol, Mexico City 04530, DF, Mexico. RP de la Torre, L, Inst Nacl Pediat, Dept Cirugia, Clin Colon & Recto, Insurgentes Sur 3700-C,2do Piso, Mexico City 04530, DF, Mexico. CR BOLEY SJ, 1977, GASTROENTEROLOGY, V72, P650 DELATORRE ML, 1995, J PEDIATR SURG, V30, P72 FISHMAN SJ, 1998, J PEDIATR SURG, V33, P1163 FISHMAN SJ, 2000, J PEDIATR SURG, V35, P982 FISHMAN SJ, 2001, GASTROINTEST ENDOSC, V11, P813 GORDON FH, 2001, BEST PRACT RES CL GA, V15, P41 GRAVIER L, 1982, J PEDIATR SURG, V17, P78 HEMINGWAY AP, 1989, BLOOD REV, V3, P147 IRISH MS, 1999, SEMIN PEDIAT SURG, V8, P210 JEFFERY PJ, 1976, BRIT J SURG, V63, P678 JENKINSON SA, 1989, J AM OSTEOPATH ASSOC, V89, P337 LOW DW, 1994, SEMIN PEDIAT SURG, V3, P40 MEYER CT, 1981, MEDICINE, V60, P36 MULLIKEN JB, 1982, PLAST RECONSTR SURG, V69, P412 MULLIKEN JB, 2000, CURR PROB SURG, V37, P521 MUNN J, 1990, J PEDIATR SURG, V25, P701 PHILIPS JF, 1985, ANGIOGRAPHY VASCULAR, P393 RICHTER JM, 1989, DIGEST DIS SCI, V34, P1542 SERVELLE M, 1976, ANN SURG, V183, P418 TAKAHASHI K, 1994, J CLIN INVEST, V93, P2357 TELANDER RL, 1993, J PEDIATR SURG, V28, P379 TOKIWA K, 1989, J PEDIATR SURG, V24, P311 NR 22 TC 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 USA SN 0022-3468 J9 J PEDIAT SURG JI J. Pediatr. Surg. PD DEC PY 2002 VL 37 IS 12 BP 1754 EP 1757 PG 4 SC Pediatrics; Surgery GA 622RQ UT ISI:000179661100028 ER PT J AU Krizek, M Luca, F Somer, L TI On the convergence of series of reciprocals of primes related to the Fermat numbers SO JOURNAL OF NUMBER THEORY LA English DT Article DE Fermat numbers; elite primes; sum of reciprocals; density AB We examine densities of several sets connected with the Fermat numbers F-m = 2(2m) + 1. In particular, we prove that the series of reciprocals of all prime divisors of Fermat numbers is convergent. We also show that the series of reciprocals of elite primes is convergent. (C) 2002 Elsevier Science (USA). C1 Acad Sci Czech Republ, Math Inst, CZ-11567 Prague 1, Czech Republic. UNAM, Inst Matemat, Morelia 58089, Michoacan, Mexico. Catholic Univ Amer, Dept Math, Cardinal Stn, Washington, DC 20064 USA. RP Krizek, M, Acad Sci Czech Republ, Math Inst, Zitna 25, CZ-11567 Prague 1, Czech Republic. CR AIGNER A, 1986, MONATSH MATH, V101, P85 BUGEAUD Y, 1996, J NUMBER THEORY, V61, P311 GOLOMB SW, 1955, MATH SCAND, V3, P264 KRIZEK M, 2001, 17 LECT FERMAT NUMBE MONTGOMERY HL, 1973, MATHEMATIKA, V20, P119 PEPIN P, 1877, CR HEBD ACAD SCI, V85, P329 NR 6 TC 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-314X J9 J NUMBER THEOR JI J. Number Theory PD NOV PY 2002 VL 97 IS 1 BP 95 EP 112 PG 18 SC Mathematics GA 620WY UT ISI:000179557500007 ER PT J AU Miller, S Billings, DL Clifford, B TI Post-abortion care - Reply SO JOURNAL OF MIDWIFERY & WOMENS HEALTH LA English DT Letter C1 Womens Global Hlth Imperat, San Francisco, CA USA. Ipas, Mexico City, DF, Mexico. RP Miller, S, Womens Global Hlth Imperat, San Francisco, CA USA. CR DUDLEY S, 2000, SAFETY ABORTION NR 1 TC 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1526-9523 J9 J MIDWIFERY WOMEN HEALTH JI J. Midwifery Women Health PD NOV-DEC PY 2002 VL 47 IS 6 BP 502 EP 502 PG 1 SC Nursing; Nursing GA 620PR UT ISI:000179542200017 ER PT J AU Campa-Molina, J Blanco, O Correz-Gomez, A Czank, M Castellanos-Guzman, AG TI Electron and light microscopy studies on the domain structures of Zn3B7O13Cl,Zn3B7O13Br and Zn3B7O13I ferroic boracites SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE boracite crystals; domains; ferroelasticity; ferroelectricity; phase transitions; polarized-light microscopy; transmission and scanning electron microscopy ID CRYSTAL-STRUCTURES; YBA2CU3O7-DELTA AB The domain structures of Zn3B7O13Cl, Zn3B7O13Br and Zn3B7O13I boracite single crystals were studied by means of polarized light in conjunction with electron microscopy. Single crystals of the three compositions were grown by chemical transport reactions in closed quartz ampoules, at a temperature of 900 degreesC and were examined by polarizing optical microscopy (PLM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For both PLM and SEM, the same as-grown samples were used without having to resort to metallization of the crystal faces. For TEM the single crystals were crushed and mounted on holey carbon films. Comparative electron microscope images were useful for revealing the domain structure of these ferroelectric/ferroelastic materials previously observed between the crossed polars of an optical microscope. X-ray diffraction analysis of the pulverized crystals was performed for this triad of halogen boracites containing zinc as a common metal. C1 Univ Guadalajara, Lab Invest Mat, DIP CUCEI, Guadalajara 44281, Jalisco, Mexico. Cicese CCMC Unam, Ensenada 22800, Baja California, Mexico. Univ Kiel, Inst Geowissensch, D-24098 Kiel, Germany. RP Castellanos-Guzman, AG, Univ Guadalajara, Lab Invest Mat, DIP CUCEI, Apdo Postal 2-638, Guadalajara 44281, Jalisco, Mexico. CR AIZU K, 1970, PHYS REV B, V2, P754 ASCHER E, 1966, J APPL PHYS, V37, P1404 AVERTY D, 1993, FERROELECTRICS, V140, P17 BERSET G, 1985, ACTA CRYSTALLOGR C, V41, P1694 BURZO E, 1993, LANDOLTBORNSTEIN NUM, P128 CAMPAMOLINA J, 2000, THESISN CICESE CCMC CAO W, 1994, FERROELECTRICS, V157, P19 CASTELLANOSGUZM.AG, 1992, FERROELECTRICS, V128, P255 CASTELLANOSGUZMAN AG, 1997, J MICROSC-OXFORD 1, V185, P1 CLIN M, 1985, JAP J PHYS, V24, P1054 DANA JD, 1951, SYSTEM MINERALOGY, P378 DANA JD, 1997, NEW MINERALOGY DELFINO M, 1980, INORG CHIM ACTA, V43, P59 FOUASSIER C, 1970, Z ANORG ALLG CHEM, V375, P202 FOUSEK J, LECT NOTES FOUSEK J, 1992, FERROELECTRIC CERAMI, P87 HANKEL WG, 1859, GESELLSCHAFT WISSENS, V4 HONEA RM, 1962, AM MINERAL, V47, P665 KAHMANN F, 1992, PHASE TRANSIT, V40, P171 KRAUS W, 1996, J APPL CRYSTALLOGR 3, V29, P301 LEBIHAN R, 1989, FERROELECTRICS, V97, P19 LEVASSEUR A, 1979, THESIS U BORDEAUX 1 LINES ME, 1979, INT SERIES MONOGRAPH LUYTEN W, 1993, ULTRAMICROSCOPY, V49, P123 MAO SY, 1991, FERROELECTRICS, V115, P91 MEYER KP, 1981, ULTRAMICROSCOPY, V6, P67 MILAT O, 1992, ULTRAMICROSCOPY, V41, P65 NELMES RJ, 1974, J PHYS C SOLID STATE, V7, P3840 SALJE EHK, 1993, PHASE TRANSITIONS FE, P1 SCHMID H, 1965, J PHYS CHEM SOLIDS, V26, P973 SCHMID H, 1969, GROWTH CRYSTALS, V7, P25 SCHMID H, 1970, PHYS STATUS SOLIDI, V37, P209 SCHMID H, 1976, FERROELECTRICS, V10, P283 SCHMID H, 1978, FERROELECTRICS, V20, P21 SCHMID H, 1988, Z PHYS B, V72, P305 SCHMID H, 1992, FERROELECTRIC CERAMI, P107 VANTENDELOO G, 1988, J ELECTRON MICROSC T, V8, P285 WADHAWAN VK, 1998, PHASE TRANSIT A, V64, P165 WADHAWAN VK, 2000, INTRO FERROIC MAT, P189 WHATMORE RW, 1980, FERROELECTRICS, V27, P67 WHATMORE RW, 1980, PHYS STATUS SOLIDI A, V61, P73 ZIMMERMANN A, 1970, PHYS STATUS SOLIDI A, V3, P707 NR 42 TC 1 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD DEC PY 2002 VL 208 PN Part 3 BP 201 EP 211 PG 11 SC Microscopy GA 621FV UT ISI:000179578600006 ER PT J AU Alonso, MA Pogosyan, GS Wolf, KB TI Wigner functions for curved spaces. I. On hyperboloids SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID PHASE-SPACE; DYNAMICAL SYMMETRIES; SPHERICAL GEOMETRY; LIE-ALGEBRAS; WAVE-FIELDS; ABERRATION; SCATTERING; SYSTEMS AB We propose a Wigner quasiprobability distribution function for Hamiltonian systems in spaces of constant curvature, in this article on hyperboloids, which returns the correct marginals and has the covariance of the Shapiro functions under SO(D,1) transformations. To the free systems obeying the Laplace-Beltrami equation on the hyperboloid, we add a conic-oscillator potential in the hyperbolic coordinate. As an example, we analyze the one-dimensional case on a hyperbola branch, where this conic-oscillator is the Poschl-Teller potential. We present the analytical solutions and plot the computed results. The standard theory of quantum oscillators is regained in the contraction limit to the space of zero curvature. (C) 2002 American Institute of Physics. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Cuernavaca 62251, Morelos, Mexico. Yerevan State Univ, Int Ctr Adv Studies, Yerevan 375049, Armenia. Joint Nucl Res Inst, Theoret Phys Lab, Dubna 141980, Russia. RP Alonso, MA, Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Apartado Postal 48-3, Cuernavaca 62251, Morelos, Mexico. CR ALONSO MA, 2001, J OPT SOC AM A, V18, P910 ATAKISHIYEV NM, 1989, J MATH PHYS, V30, P2457 ATAKISHIYEV NM, 1989, J MATH PHYS, V30, P2463 BARGMANN V, 1947, ANN MATH, V48, P568 BASU D, 1983, J MATH PHYS, V24, P478 BRIF C, 1999, PHYS REV A, V59, P971 ERDELYI A, 1953, HIGHER TRANSCENDENTA, V2 FORBES GW, 2000, J OPT SOC AM A, V17 FRANK A, 1984, PHYS REV LETT, V52, P1737 FRANK A, 1985, J MATH PHYS, V26, P973 GARCIACALDERON G, 1980, J PHYS A, V13, L185 GELFAND IM, 1947, IZV AKAD NAUK SSSR, V11, P411 GELFAND IM, 1963, REPRESENTATIONS ROTA GELFAND IM, 1969, REPRESENTATION THEOR GREEN MB, 1988, SUPERSTRING THEORY, V1 GREEN MB, 1988, SUPERSTRING THEORY, V2 GROSCHE C, 1995, FORTSCHR PHYS, V43, P453 GROSCHE C, 1996, PHYS PART NUCLEI, V27, P244 GUTZWILLER MC, 1985, PHYS SCR T, V9, P184 HAHN W, 1949, MATH NACHR, V2, P4 HIGGS PW, 1979, J PHYS A, V12, P309 KURMYSHEV EV, 1993, PHYS REV A, V47, P3365 LANDAU LD, 1968, QUANTUM MECH LEE HW, 1995, PHYS REP, V259, P147 LEEMON HI, 1979, J PHYS A, V12, P489 SCHRODINGER E, 1941, P R IRISH ACAD A, V47, P53 SCHRODINGER E, 1941, P ROY IRISH ACAD A, V46, P183 SCHRODINGER E, 1941, P ROY IRISH SOC, V46, P9 SNYDER HS, 1947, PHYS REV, V71, P38 WIGNER E, 1932, PHYS REV, V40, P749 WOLF KB, 1979, INTEGRAL TRANSFORMS WOLF KB, 1989, LECT NOTE PHYS, V352, P115 WOLF KB, 1993, J OPT SOC AM A, V10, P1925 WOLF KB, 1995, EUR J PHYS, V16, P14 WOLF KB, 1999, J OPT SOC AM A, V16, P2476 YANG CN, 1947, PHYS REV, V72, P874 NR 36 TC 6 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0022-2488 J9 J MATH PHYS-NY JI J. Math. Phys. PD DEC PY 2002 VL 43 IS 12 BP 5857 EP 5871 PG 15 SC Physics, Mathematical GA 619NT UT ISI:000179483200001 ER PT J AU Tichit, D Rolland, A Prinetto, F Fetter, G Martinez-Ortiz, MD Valenzuela, MA Bosch, P TI Comparison of the structural and acid-base properties of Ga- and Al-containing layered double hydroxides obtained by microwave irradiation and conventional ageing of synthesis gels SO JOURNAL OF MATERIALS CHEMISTRY LA English DT Article ID CLAISEN-SCHMIDT CONDENSATION; ALDOL CONDENSATION; MG-AL; THERMAL-DECOMPOSITION; HYDROTALCITES; CATALYSIS; ACETONE; ZEOLITES; CATION; OXIDES AB Structural and acid-base properties of Mg/Al and Mg/Ga layered double hydroxides (LDH's) obtained by microwave irradiation of the co-precipitated gels have been investigated and compared to those of samples conventionally aged by prolonged hydrothermal treatment of the gels. Similar crystallinities and chemical compositions were obtained whatever the synthesis method used. Besides, all samples, and remarkably the Ga-containing LDH's with a molar ratio Mg : Ga = 4.5, exhibited pure lamellar phases. The acid-base properties of the mixed oxides obtained by calcination of the LDH's have been examined by microcalorimetric adsorption of CO2 and by FTIR spectroscopy upon CH3CN interaction. These techniques gave evidence that the number and strength of acid and basic sites were influenced by the nature and amount of the trivalent cation, as well as by the preparation method. C1 ENSCM, CNRS, UMR 5618, Lab Mat Catalyt & Catalyse Chim Organ, F-34296 Montpellier 5, France. Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy. Benemerita Univ Autonoma Puebla, Fac Ciencias Quim, Puebla 72570, Mexico. UPALM, Inst Politecn Nacl, ESIQIE, SEPI, Mexico City 07738, DF, Mexico. Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico. RP Tichit, D, ENSCM, CNRS, UMR 5618, Lab Mat Catalyt & Catalyse Chim Organ, 8 Rue Ecole Normal, F-34296 Montpellier 5, France. CR ARAMENDIA MA, 1997, J SOLID STATE CHEM, V131, P78 ARAMENDIA MA, 1999, J MATER CHEM, V9, P1603 ARAMENDIA MA, 1999, MICROPOR MESOPOR MAT, V29, P319 CAVANI F, 1991, CATAL TODAY, V11, P173 CHOUDARY BM, 1999, J MOL CATAL A-CHEM, V146, P279 CLIMENT MJ, 1995, J CATAL, V151, P60 FETTER G, 1997, J POROUS MAT, V4, P27 GUIDA A, 1997, APPL CATAL A-GEN, V164, P251 KANNAN S, 1997, J MATER SCI, V32, P1623 KOOLI F, 1997, CLAY CLAY MINER, V45, P92 LAVALLEY JC, 1996, CATAL TODAY, V27, P377 LOPEZSALINAS E, 1996, J POROUS MAT, V3, P169 LOPEZSALINAS E, 1997, J PHYS CHEM SOLIDS, V58, P919 PRINETTO F, 2000, CATAL TODAY, V55, P103 PRINETTO F, 2000, J PHYS CHEM B, V104, P11117 PURCELL KF, 1966, J AM CHEM SOC, V88, P919 REICHLE WT, 1985, J CATAL, V94, P547 ROUSSELOT I, 1999, INT J INORG MATER, V1, P165 SUZUKI E, 1988, B CHEM SOC JPN, V61, P1008 SUZUKI E, 1990, J MOL CATAL, V61, P283 TICHIT D, 1995, J CATAL, V151, P50 TICHIT D, 1998, APPL CLAY SCI, V13, P401 UENO S, 1998, CHEM COMMUN 0207, P295 VALENTE JS, 2000, J CATAL, V189, P370 VELU S, 1994, APPL CATAL A-GEN, V119, P241 VUCELIC M, 1997, CLAY CLAY MINER, V45, P803 WEIR MR, 1997, CHEM MATER, V9, P1686 YARWOOD J, 1973, SPECTROSCOPY STRUCTU, P141 NR 28 TC 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 0959-9428 J9 J MATER CHEM JI J. Mater. Chem. PY 2002 VL 12 IS 12 BP 3832 EP 3838 PG 7 SC Chemistry, Physical; Materials Science, Multidisciplinary GA 620WA UT ISI:000179554700083 ER PT J AU Ibanez, C Juste, J Lopez-Wilchis, R Albuja, L Nunez-Garduo, A TI Echolocation of three species of sac-winged bats (Balantiopteryx) SO JOURNAL OF MAMMALOGY LA English DT Article DE Balantiopteryx; bats; body size; echolocation; emballonuridae; habitat ID ATMOSPHERIC ATTENUATION; EMBALLONURID BATS; NEOTROPICAL BATS; BEHAVIOR; CALLS; PIPISTRELLUS; FREQUENCIES; PLASTICITY; ECOLOGY; SIGNALS AB We describe and compare field recordings of echolocation calls of the neotropical emballonurid sac-winged bats Balantiopteryx plicata, B. io, and B. infusca. These 3 species have search-phase calls with principal energy in the 2nd harmonic, characterized by a long narrowband component followed by a short broadband component. Variation in call parameters follows only partially the scaling pattern with body size generally found in bats. Based on characteristics of their echolocation calls, we hypothesize that B. io and B. infusca forage in more cluttered habitats than does the congeneric B. plicata, which typically hunts in open areas. C1 CSIC, Estac Biol Donana, E-41080 Seville, Spain. Univ Autonoma Metropolitana Iztapalapa, Dept Biol, Mexico City 09340, DF, Mexico. Escuela Politec Nacl, Dept Ciencias Biol, Quito, Ecuador. Univ Michoacana, Fac Biol, Morelia 58040, Michoacan, Mexico. RP Ibanez, C, CSIC, Estac Biol Donana, Apartado 1056, E-41080 Seville, Spain. CR *STATS INC, 1999, STAT WIND ARROYOCABRALES J, 1988, MAMMALIAN SPECIES, V301, P1 ARROYOCABRALES J, 1988, MAMMALIAN SPECIES, V313, P1 BARCLAY RMR, 1983, J COMP PHYSIOL, V151, P515 BRADBURY JW, 1976, BEHAV ECOL SOCIOBIOL, V1, P337 FENTON MB, 1980, CAN J ZOOL, V58, P1774 FENTON MB, 1990, CAN J ZOOL, V68, P411 FENTON MB, 1998, CAN J ZOOL, V76, P1174 GRIFFIN DR, 1960, ANIM BEHAV, V8, P141 GRIFFIN DR, 1971, ANIM BEHAV, V19, P55 HELLER KG, 1989, Z SAUGETIERKD, V54, P1 JONES G, 1994, FUNCT ECOL, V8, P450 JONES G, 1996, S ZOOLOGICAL SOC LON, V69, P11 JONES G, 1999, J EXP BIOL, V202, P3359 KALKO EKV, 1993, BEHAV ECOL SOCIOBIOL, V33, P415 KALKO EKV, 1995, S ZOOL SOC LOND, V67, P259 KALKO EKV, 1998, BAT BIOL CONSERVATIO, P197 LAWRENCE BD, 1982, J ACOUST SOC AM, V71, P585 MCCARTHY TJ, 2000, J MAMMAL, V81, P958 NEUWEILER G, 1989, TRENDS ECOL EVOL, V4, P160 NOVICK A, 1962, J MAMMAL, V43, P449 OFARRELL MJ, 1997, J MAMMAL, V78, P954 OFARRELL MJ, 1999, BIOTROPICA, V31, P507 PYE JD, 1979, ENDEAVOUR, V3, P57 PYE JD, 1980, TRENDS NEUROSCI, V3, P232 SCHNITZLER HU, 1987, J COMP PHYSIOL A, V161, P267 SCHNITZLER HU, 1998, BAT BIOL CONSERVATIO, P183 SIEMERS BM, 2001, BEHAV ECOL SOCIOBIOL, V50, P317 SIMMONS JA, 1980, J COMP PHYSL, V135, P61 NR 29 TC 3 PU ALLIANCE COMMUNICATIONS GROUP DIVISION ALLEN PRESS PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 USA SN 0022-2372 J9 J MAMMAL JI J. Mammal. PD NOV PY 2002 VL 83 IS 4 BP 1049 EP 1057 PG 9 SC Zoology GA 621HP UT ISI:000179583200014 ER PT J AU Garcia, L Hernandez, I Sandoval, A Salazar, A Garcia, J Vera, J Grijalva, G Muriel, P Margolin, S Armendariz-Borunda, J TI Pirfenidone effectively reverses experimental liver fibrosis SO JOURNAL OF HEPATOLOGY LA English DT Article DE hepatic regeneration; antifibrotic therapy; gene regulation; metalloprotease ID ANTIFIBROTIC AGENT; KUPFFER CELLS; GENE-THERAPY; RAT LIVERS; CIRRHOSIS; COLLAGEN; MICE AB Background/Aims: Our group has been involved in searching for different strategies to ameliorate hepatic cirrhosis. The aim of this study was to evaluate the effect of Pirfenidone in the reversion or prevention of cirrhosis experimentally induced in rats by chronic administration Of CCl4 and bile-duct ligation (BDL). Methods: Male cirrhotic Wistar rats (8 weeks of intoxication and then hepatotoxin was discontinued) received either oral saline or Pirfenidone at 500 mg/kg per day. Results: High levels of alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase decreased significantly (P < 0.001) in animals treated with Pirfenidone (n = 11) with regard to saline-administrated animals (n = 9). Prothrombin activity and bilirubins were also reduced. Computerized fibrosis index demonstrated a 70% decrease (P < 0.001) along with less hydroxyproline content, reduction in activated HSC and higher active cell regeneration. A rearrangement of the parenchyma was also noted and gene expression of collagens I, III and IV, transforming growth factor β-1, Smad-7, TIMP-1 and PAI-1 decreased considerably in treated animals. Cirrhotic rats in which CCl4 was not discontinued displayed 40% liver fibrosis reduction. In a different cirrhosis model, 4-week BDL rats treated with the drug showed a significant 50% reduction in hepatic fibrosis (P < 0.01). Conclusions: This new drug might be useful in healing human disease. © 2002 European Association for the Study of the Liver. Published by Elsevier Science B.V. All rights reserved. C1 Univ Guadalajara, CUCS, Inst Mol Biol Med & Gene Therapy, Guadalajara 44281, Jalisco, Mexico. IPN, CINVESTAV, Dept Farmacol, Mexico City 07738, DF, Mexico. Marnac Inc, Dallas, TX 75225 USA. RP Armendariz-Borunda, J, Univ Guadalajara, CUCS, Inst Mol Biol Med & Gene Therapy, Apdo Postal 2-123, Guadalajara 44281, Jalisco, Mexico. CR ALTOOK S, 1998, FERTIL STERIL, V69, P341 ANGULO P, 2002, DIGEST DIS SCI, V47, P157 ARMENDARIZBORUN.J, 1991, HEPATOLOGY, V14, P895 ARMENDARIZBORUNDA J, 1997, BBA-GENE STRUCT EXPR, V1353, P241 BRADFORD MM, 1976, ANAL BIOCHEM, V72, P248 BUENO MR, 2000, J HEPATOL, V33, P915 CHOMCZYNSKI P, 1987, ANAL BIOCHEM, V162, P156 DELGADORIZO V, 1998, BBA-GENE STRUCT EXPR, V1442, P20 DOSANJH AK, 1998, TRANSPLANT P, V30, P1910 FRIEDMAN SL, 1993, NEW ENGL J MED, V328, P1828 FRIEDMAN SL, 2000, HEPATOLOGY, V32, P1403 GAO CH, 1999, HUM GENE THER, V10, P911 IYER SN, 1995, J LAB CLIN MED, V125, P779 LEE BS, 1998, J CLIN ENDOCR METAB, V83, P219 MAHER JJ, 1998, GASTROINTESTINAL LIV, V2, P1199 NAGARAJAN RP, 1999, J BIOL CHEM, V274, P33412 RAGHU G, 1999, AM J RESP CRIT CARE, V159, P1061 RECKNAGEL RO, 1983, TRENDS PHARMACOL SCI, V4, P129 ROJKIND M, 1974, ANAL BIOCHEM, V57, P1 RUDOLPH KL, 2000, SCIENCE, V287, P1253 SALGADO S, 2000, MOL THER, V2, P545 SHETLAR MR, 1998, J LAB CLIN MED, V132, P491 SHIMIZU T, 1998, KIDNEY INT, V54, P99 UEKI T, 1999, NAT MED, V5, P226 NR 24 TC 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-8278 J9 J HEPATOL JI J. Hepatol. PD DEC PY 2002 VL 37 IS 6 BP 797 EP 805 PG 9 SC Gastroenterology & Hepatology GA 621JF UT ISI:000179584700013 ER PT J AU Sanson, LZ Van Heijst, GJF TI Ekman effects in a rotating flow over bottom topography SO JOURNAL OF FLUID MECHANICS LA English DT Article ID BAROTROPIC VORTICES; LABORATORY EXPERIMENTS; VORTEX; FLUID; EVOLUTION; EDDIES AB This paper presents a general two-dimensional model for rotating barotropic flows over topography. The model incorporates in a vorticity-stream function formulation both inviscid topography effects, associated with stretching and squeezing of fluid columns enforced by their motion over variable topography, and viscous effects, due to the Ekman boundary layer at the solid bottom. From the present formulation, conventional two-dimensional models can be recovered. The model is tested by means of laboratory experiments on homogeneous vortices encountering irregular topographies. The experimental observations are then compared with the corresponding numerical simulations based on the general model. The results suggest that such a formulation incorporates both inviscid and viscous topography effects correctly. C1 CICESE, Dept Phys Oceanog, Ensenada 22860, Baja California, Mexico. Eindhoven Univ Technol, Dept Phys, NL-5600 MB Eindhoven, Netherlands. RP Sanson, LZ, CICESE, Dept Phys Oceanog, Km 107 Carr Tijuana Ensenada, Ensenada 22860, Baja California, Mexico. CR CARNEVALE GF, 1991, J FLUID MECH, V233, P119 CHARNEY JG, 1949, TELLUS, V1, P38 FUENTES OUV, 1996, J FLUID MECH, V307, P11 GILL AE, 1982, ATMOSPHERE OCEAN DYN GRIMSHAW R, 1994, GEOPHYS ASTRO FLUID, V76, P43 HART JE, 1995, GEOPHYS ASTRO FLUID, V79, P201 HART JE, 2000, PHYS FLUIDS, V12, P131 HOPFINGER EJ, 1993, ANNU REV FLUID MECH, V25, P241 HUPPERT HE, 1976, DEEP-SEA RES, V23, P655 KLOOSTERZIEL RC, 1992, J FLUID MECH, V239, P607 MAAS LRM, 1993, J FLUID MECH, V246, P117 ORLANDI P, 1992, FLUID DYN RES, V9, P179 PEDLOSKY J, 1987, GEOPHYSICAL FLUID DY SANSON LZ, 2000, J FLUID MECH, V412, P75 SANSON LZ, 2000, J PHYS OCEANOGR, V30, P2141 SANSON LZ, 2001, PHYS FLUIDS, V13, P440 SANSON LZ, 2002, IN PRESS DYN ATMOS O TAYLOR GI, 1923, P R SOC LOND A-CONTA, V104, P213 VANGEFFEN JHG, 1998, R1466D EINDH U TECHN VANHEIJST GJF, 1991, J FLUID MECH, V225, P301 VANHEIJST GJF, 1994, MECCANICA, V29, P431 VOSBEEK PWC, 1998, THESIS EINDHOVEN U T WEDEMEYER EH, 1964, J FLUID MECH, V20, P383 NR 23 TC 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4221 USA SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD NOV 25 PY 2002 VL 471 BP 239 EP 255 PG 17 SC Physics, Fluids & Plasmas; Mechanics GA 620GP UT ISI:000179525900011 ER PT J AU Silant'ev, NA TI Calculation of the diffusion coefficient in acoustic turbulence SO JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS LA English DT Article AB The first (Born) approximation commonly used to calculate the diffusion coefficient D-T of a passive scalar in acoustic turbulence is shown to be insufficient. Even for a small main parameter-the Mach number, M < 1-the next approximation gives a larger contribution to D-T than does the first approximation, but negative in sign. We present a procedure for correctly calculating D-T based on the solution of a nonlinear DIA (direct interaction approximation) equation for the mean Green's function of the problem. We include an additional term in the general formula for D-T that directly describes the compressibility of acoustic turbulence. This term has not been known previously and has been disregarded even in the Born approximation. A positive value was obtained for D-T = CM(3)u(0)/p(0). The spectrum E(x) was assumed to be smooth at distances Deltax similar to M-2 < 1. (C) 2002 MAIK "Nauka / Interperiodica". C1 Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. Russian Acad Sci, Pulkovo Astron Observ, St Petersburg 196140, Russia. RP Silant'ev, NA, Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. 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PY 2002 VL 95 IS 5 BP 957 EP 964 PG 8 SC Physics, Multidisciplinary GA 622CT UT ISI:000179629500019 ER PT J AU Rojas-Aguilara, A TI An isoperibol micro-bomb combustion calorimeter for measurement of the enthalpy of combustion. Application to the study of fullerene C-60 SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article DE buckminsterfullerene; combustion calorimetry; enthalpy of combustion; enthalpy of formation ID STANDARD ENTHALPY; BUCKMINSTERFULLERENE C-60; 10 MG; SAMPLES; HEAT AB A microstatic-bomb combustion calorimeter has been developed from a 1107 Parr semi-micro-bomb. The energy equivalent of this calorimeter is just epsilon(calor) = (687.45 +/- 0.34) J.K-1, which means an uncertainty of 0.05% for the calibration with benzoic acid NIST 39j. This combustion calorimeter has found direct application in the measurement of the enthalpy of combustion of the fullerene C-60, giving Delta(c)U(m)degrees(cr, 298.15 K) = -(25899.1 +/- 14.2) kJ.mol(-1) for this substance. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 IPN, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07360, DF, Mexico. RP Rojas-Aguilara, A, IPN, Ctr Invest & Estudios Avanzados, Dept Quim, Av Inst Politecn Nacl 2508, Mexico City 07360, DF, Mexico. 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Chem. Thermodyn. PD OCT PY 2002 VL 34 IS 10 BP 1729 EP 1743 PG 15 SC Chemistry, Physical; Thermodynamics GA 620FE UT ISI:000179522700016 ER PT J AU Ayala, R Martinez, JM Pappalardo, RR Saint-Martin, H Ortega-Blake, I Marcos, ES TI Development of first-principles interaction model potentials. An application to the study of the bromide hydration SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID MOLECULAR-DYNAMICS SIMULATIONS; ABSORPTION FINE-STRUCTURE; FLUORIDE-WATER CLUSTERS; MONTE-CARLO SIMULATIONS; AQUEOUS IONIC CLUSTERS; X = F; AB-INITIO; COMPUTER-SIMULATIONS; POLARIZABLE WATER; FREE-ENERGY AB This work presents the development of first-principles bromide ion-water interaction potentials using the mobile charge density in harmonic oscillators-type model. This model allows for a flexible and polarizable character of the interacting molecules and has already been parametrized for water-water interactions. The prospected potential energy surfaces of the bromide ion-water system were computed quantum-mechanically at Hartree-Fock and Moller-Plesset second-order perturbation levels. In addition to the ion-solvent molecule pair, structures formed by the anion and two or three water molecules were considered in order to include many body effects. Minimizations of hydrated bromide clusters in gas phase [Br(H2O)(n)](-) (n=1-6,10,15,20) and Monte Carlo computations of bromide aqueous solutions were performed to test the new potentials. Both structural and thermodynamic properties have been studied in detail and compared to the available experimental and theoretical values. From these comparisons, it was concluded the importance of including basis set superposition error corrections for the two-body interactions, and the small role of both electron correlation on the three-body terms and the four-body terms. Monte Carlo simulation results have also been used to investigate if the presence of the anion significantly affects the intramolecular geometry of the water molecules and the degree of disruption of the water solvent structure in its vicinity.(C) 2002 American Institute of Physics. C1 Univ Sevilla, Dept Quim Fis, E-41012 Seville, Spain. Univ Autonoma Mexico, Ctr Ciencias Fis, Cuernavaca 62251, Morelos, Mexico. RP Ayala, R, Univ Sevilla, Dept Quim Fis, E-41012 Seville, Spain. 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Chem. Phys. PD DEC 15 PY 2002 VL 117 IS 23 BP 10512 EP 10524 PG 13 SC Physics, Atomic, Molecular & Chemical GA 619UC UT ISI:000179495000012 ER PT J AU Ramos-Gonzalez, MI Olson, M Gatenby, AA Mosqueda, G Manzanera, M Campos, MJ Vichez, S Ramos, JL TI Cross-regulation between a novel two-component signal transduction system for catabolism of toluene in Pseudomonas mendocina and the TodST system from Pseudomonas putida SO JOURNAL OF BACTERIOLOGY LA English DT Article ID CLUSTER ENCODING TOLUENE-4-MONOOXYGENASE; GRAM-NEGATIVE BACTERIA; FUNCTIONAL-ANALYSIS; CLONING VECTOR; GENES; PLASMID; PATHWAY; STRAIN; KR1; DEGRADATION AB The tmoABCDEF genes encode the toluene-4-monooxygenase from Pseudomonas mendocina KR1. Upstream from the tmoA gene an open reading frame, tmoX, encoding a protein 83% identical to TodX (todX being the initial gene in the todXFC1C2BADEGIH operon from Pseudomonas putida DOT-T1E) was found. The tmoX gene is also the initial gene in the tmoXABCDEF gene cluster. The transcription initiation point from the tmoX promoter was mapped, and the sequence upstream revealed striking identity with the promoter of the tod operon of P. putida. The tod operon is regulated by a two-component signal transduction system encoded by the todST genes. Two novel genes from P. mendocina KR1, tmoST, were rescued by complementation of a P. putida DOT-TIE todST knockout mutant, whose gene products shared about 85% identity with TodS-TodT. We show that transcription from P-tmoX and P-todX can be mediated by TmoS-TmoT or TodS-TodT, in the presence of toluene, revealing cross-regulation between these two catabolic pathways. C1 CSIC, Estac Expt Zaidin, Dept Biochem & Mol & Cellular Biol Plants, Granada 18008, Spain. DuPont Co Inc, Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA. Ctr Invest & Estudios Avanzados, Dept Plant Genet Engn, Plant Biotechnol Unit, Guanajuato 36500, Mexico. RP Ramos-Gonzalez, MI, CSIC, Estac Expt Zaidin, Dept Biochem & Mol & Cellular Biol Plants, Prof Albareda 1, Granada 18008, Spain. CR ALTSCHUL SF, 1997, NUCLEIC ACIDS RES, V25, P3389 BENBASSAT A, 2001, 0192539, WO, APPL BUCK M, 2000, J BACTERIOL, V182, P4129 CASES I, 2001, J BACTERIOL, V183, P5128 DIMARCO AA, 1994, J BACTERIOL, V176, P4277 DUETZ WA, 1994, APPL ENVIRON MICROB, V60, P2858 ENDERLE PJ, 1998, BIOTECHNIQUES, V25, P954 FELLAY R, 1987, GENE, V52, P147 FERNANDEZ S, 1994, J BACTERIOL, V176, P5052 FRANKLIN FCH, 1981, P NATL ACAD SCI USA, V78, P7458 FRIEDMAN AM, 1982, GENE, V18, P289 HARWOOD CS, 1996, ANNU REV MICROBIOL, V50, P553 KAHNG HY, 2000, J BACTERIOL, V182, P1232 KANIGA K, 1991, GENE, V109, P137 KOVACH ME, 1995, GENE, V166, P175 LAU PCK, 1997, P NATL ACAD SCI USA, V94, P1453 LEHAY JG, 1997, APPL ENVIRON MICROB, V63, P3736 MARQUES S, 1994, J BACTERIOL, V176, P2517 MCCLAY K, 1995, APPL ENVIRON MICROB, V61, P3479 MENN FM, 1991, GENE, V104, P91 MILLER JH, 1972, EXPT MOL GENETICS MOSQUEDA G, 1999, GENE, V232, P69 MOSQUEDA G, 2000, J BACTERIOL, V182, P937 PEREZMARTIN J, 1997, ANNU REV MICROBIOL, V51, P593 RAMOS JL, 1995, J BACTERIOL, V177, P3911 RAMOSGONZALEZ MI, 1998, J BACTERIOL, V180, P3421 SHINE J, 1974, P NATL ACAD SCI USA, V71, P1342 SPAINK HP, 1987, PLANT MOL BIOL, V9, P27 SZE CC, 2001, J BACTERIOL, V183, P2842 SZE CC, 2002, J BACTERIOL, V184, P760 VELASCO A, 1998, J BACTERIOL, V180, P1063 VIEIRA J, 1982, GENE, V19, P259 VILCHEZ S, 2000, J BACTERIOL, V182, P91 WANG Y, 1995, MOL GEN GENET, V246, P570 WHITE DC, 1991, EUR J ANAESTHESIOL S, V4, P1 WRIGHT A, 1994, APPL ENVIRON MICROB, V60, P235 YEN KM, 1991, J BACTERIOL, V173, P5315 YEN KM, 1992, J BACTERIOL, V174, P7253 NR 38 TC 12 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD DEC PY 2002 VL 184 IS 24 BP 7062 EP 7067 PG 6 SC Microbiology GA 620JA UT ISI:000179529200034 ER PT J AU Navar, J Najera, J Jurado, E TI Biomass estimation equations in the Tamaulipan thornscrub of north-eastern Mexico SO JOURNAL OF ARID ENVIRONMENTS LA English DT Article DE aboveground biomass components; additivity procedures; non-linear; log-transformed; multiple linear and nonlinear models; Nuevo Leon; Mexico ID NORTHEASTERN MEXICO; TREE; FOREST AB This report presents allometric equations to estimate biomass components for ten typical shrub species of the Tamaulipan thomscrub of north-eastern Mexico with potential applications for forest inventory. Four procedures of total biomass estimation were tested. Equations developed in multiple linear least square stepwise procedures are recommended to estimate biomass components and additive total biomass for single shrub species, as well as for all species tested. (C) 2002 Published by Elsevier Science Ltd. C1 UANL, Fac Ciencias Forestales, Mexico City 67700, DF, Mexico. Semarnat, Durango, Mexico. RP Navar, J, UANL, Fac Ciencias Forestales, Km 145 Carretera Nacl Linares, Mexico City 67700, DF, Mexico. CR *COTECOCASARH, 1973, COEFF AG REP MEX AGEE JK, 1983, CAN J FOREST RES, V13, P648 ALANIS G, 1982, MATORRAL COMO RECURS BASKERVILLE GL, 1972, CAN J FOREST RES, V2, P49 BROWN S, 1989, FOREST SCI, V35, P881 BROWN S, 1997, 11 C MUN FOR REC FOR, V1 BURKHART HE, 1984, FOREST SCI, V30, P86 CHIYENDA SS, 1984, CAN J FOREST RES, V14, P441 CLUTTER JL, 1983, TIMBER MANAGEMENT QU CUNIA T, 1985, CAN J FOREST RES, V15, P23 DEANS JD, 1996, FOREST ECOL MANAG, V88, P215 ESTRADA E, 1990, LEGUMINOSAS CTR NUEV GREEN EJ, 1985, NORTH J APPL FOR, V2, P14 HEISEKE D, 1984, REGENERACION REBROTE HEISEKE D, 1985, MATORRAL COMO RECURS MAKELA A, 1997, FOREST SCI, V43, P7 MANZANO MG, 2000, J ARID ENVIRON, V44, P1 MARKLUND L, 1983, MESURES BIOMASSAS AC, V19, P37 MOHREN F, 1994, CO2 FIX MODEL MONSERUD RA, 1996, FOREST ECOL MANAG, V82, P59 NAVAR J, 1994, BALANCES HIDROLOGICO NAVAR J, 1999, FOREST ECOL MANAG, V124, P231 PARRESOL BR, 1999, FOREST SCI, V45, P573 PASTOR J, 1981, CAN J FOREST RES, V11, P132 REED DD, 1985, CAN J FOREST RES, V15, P1184 REID N, 1990, FOREST ECOL MANAG, V36, P61 SCHROEDER P, 1997, FOREST SCI, V43, P424 TERMIKAELIAN MT, 1997, FOREST ECOL MANAG, V97, P1 NR 28 TC 2 PU ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0140-1963 J9 J ARID ENVIRON JI J. Arid. Environ. PD OCT PY 2002 VL 52 IS 2 BP 167 EP 179 PG 13 SC Ecology; Environmental Sciences GA 621HM UT ISI:000179583000002 ER PT J AU Camacho-Fernandez, D Lopez, C Avila, E Arce, J TI Evaluation of different dietary treatments to reduce ascites syndrome and their effects on corporal characteristics in broiler chickens SO JOURNAL OF APPLIED POULTRY RESEARCH LA English DT Article DE ascites syndrome; feeding restriction; corporal characteristics ID PULMONARY-HYPERTENSION AB Four dietary treatments were applied to sexed broiler chickens to evaluate ascites syndrome (AS), mortality, and corporal composition using productive parameters, corporal characteristics, and carcass yield to derive profit-cost relationships. One-day-old broiler chicks (2,200 males and 2,200 females), from a commercial strain, were assigned to eight groups of 550 birds each. These groups were distributed among four dietary treatments: 1) feeding ad libitum with a high-density diet, 2) feeding ad libitum with a low-density diet, 3) feeding ad libitum with a high-density diet from 1 to 14 d of age and from 15 to 52 d of age with the same diet for consumption 8 h/d, 4) high-density diet at 90% feed consumption as in Treatment 1 through 52 d of age. Treatments 3 and 4, with feed restriction, resulted in lower mortality rates than Treatments 1 and 2. The highest mortality was in males. The best weight gain was achieved in Treatments 1 and 2 (P < 0.05), whereas Treatments 3 and 4 resulted in the best feed conversion. For measured corporal characteristics, the main effect, sex, resulted in significantly different (P < 0.01) intestine, liver, abdominal fat, and carcass weights; length of tibia; yellowness of skin; and lengths of the duodenum to Meckel's diverticulum and Meckel's diverticulum to rectum (P < 0.05). The main effect, dietary treatment, was significantly different (P < 0.01) only for the yellowness of the skin. The interaction between the two main effects was significant (P < 0.05) for the intestine and carcass weights. Males exceeded females in carcass weight but not in the breast weigbt/carcass weight ratio. Treatments 1 and 2 resulted in the best carcass yield but Treatment 4 resulted in the best profit-cost relationship, the lowest mortality due to AS, the best feed conversion, good corporal composition with good pigmentation, and increased economic benefits in sale systems, live birds, and carcass sale. C1 Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Anim Prod, Mexico City 04510, DF, Mexico. UNAM, FMVZ, CEIEPA, Mexico City, DF, Mexico. SARH, INIFAP, Morelia, Michoacan, Mexico. RP Camacho-Fernandez, D, Maravatio 311, Claveria 02080, DF, Mexico. CR *NAT RES COUNC, 1994, NUTR REQ DOM AN NUTR *SAS I INC, 1988, SAT STAT US GUID AGUDELO LG, 1983, POULTRY INT, V22, P8 ARCE J, 1992, J APPL POULTRY RES, V1, P1 BERGER MM, 1991, P 2 JORN MED AV MEX, P405 CUEVA S, 1974, RES VET SCI, V16, P370 DALE N, 1986, P GEORG NUTR C ATH G, P79 DALE N, 1986, POULT INT, V2, P40 DUNCAN DB, 1955, BIOMETRICS, V11, P1 GARLICH J, 1982, POULTRY SCI, V61, P1003 HALL SA, 1968, AVIAN DIS, V12, P75 HUCHZERMEYER FW, 1986, VET REC, V119, P94 JOHNSON J, 1970, EXP PARASITOL, V28, P30 JULIAN RJ, 1993, AVIAN PATHOL, V22, P419 LOPEZ CC, 1994, P 3 INT SEM AV PATH, P613 ORTEGA STJ, 1990, P 2 MES RED SINDR AS, P26 NR 16 TC 0 PU POULTRY SCIENCE ASSOC INC PI SAVOY PA 1111 NORTH DUNLAP AVE, SAVOY, IL 61874-9604 USA SN 1056-6171 J9 J APPL POULTRY RES JI J. Appl. Poult. Res. PD SUM PY 2002 VL 11 IS 2 BP 164 EP 174 PG 11 SC Agriculture, Dairy & Animal Science GA 622TK UT ISI:000179663000006 ER PT J AU Luna-Sanchez, RM Gonzalez, I Lapidus, GT TI An integrated approach to evaluate the leaching behaviour of silver from sulfide concentrates SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article DE carbon paste electrodes; cyanidation; refractory ores; silver phases mineralogy; silver sulfide ID CARBON-PASTE ELECTRODES; CYANIDATION; GOLD; VOLTAMMETRY; GALENA AB The leaching rates of two different mineral concentrates with the same silver content were investigated by cyanide leaching with silver phases identified by scanning electron microscopy (SEM) and electrochemical analysis. The mineralogical characterization (SEM) of the concentrates showed that each contained the silver in different phases. After leaching, the disappearance of only one of the phases in each concentrate was detected. The remaining silver was contained in phases that are refractory to cyanidation. Simultaneously, an electrochemical method for the detection of the different leachable and refractory silver phases in concentrates and leach residues was developed. Cyclic voltammetry was employed with the concentrate-carbon paste electrodes (concentrate-CPE) in order to detect the oxidation of the different phases of silver contained in the mineral concentrates. The extreme sensitivity of this method allowed the rapid and reliable detection of small quantities of silver, as well as the evaluation of its refractory nature. C1 Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Iztapalapa, DF, Mexico. Univ Autonoma Metropolitana Azcapotzalco, Dept Quim, Mexico City 09340, DF, Mexico. RP Lapidus, GT, Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Iztapalapa, DF, Mexico. CR *INT CTR DIFFR DAT, 1986, MIN POWD DIFFR FIL AHLBERG E, 1993, HYDROMETALLURGY, V34, P171 CISNEROSGONZALEZ I, 1999, HYDROMETALLURGY, V53, P133 CRUZ R, 1997, HYDROMETALLURGY, V46, P303 HABASHI F, 1967, STATE MONTANA BUREAU, V59, P1 IVES DJG, 1961, REFERENCE ELECT THEO KAMEDA M, 1980, 1 TOH U RES I A, V127, P1962 LAZARO I, 1995, HYDROMETALLURGY, V38, P277 LIU XB, 2001, J UNIV SCI TECHNOL B, V8, P111 LORENZEN L, 1992, HYDROMETALLURGY, V30, P177 LUNA RM, 2000, HYDROMETALLURGY, V56, P171 OSSEOASARE K, 1984, PRECIOUS METALS MINI, P173 SHUEY RT, 1975, DEV EC GEOLOGY SEMIC, P328 SUN XW, 1996, METALL MATER TRANS B, V27, P355 WADSWORTH ME, 1989, PRECIOUS RARE METAL, P3 WADSWORTH ME, 1991, P HH KELL INT S QUAN, P197 WANTAI Y, 1998, INT S GOLD REC MONTR XUE T, 1985, METALL TRANS B, V16, P455 ZHANG Y, 1997, HYDROMETALLURGY, V46, P251 NR 19 TC 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD OCT PY 2002 VL 32 IS 10 BP 1157 EP 1165 PG 9 SC Electrochemistry GA 619VF UT ISI:000179497600011 ER PT J AU Noa, M Perez, N Gutierrez, R Escobar, I Diaz, G Vega, S Prado, G Urban, G TI Stability of sulfonamides, nitrofurans, and chloramphenicol residues in preserved raw milk samples measured by liquid chromatography SO JOURNAL OF AOAC INTERNATIONAL LA English DT Article AB A stability study was made of 10 antimicrobials: sulfonamides, 3 nitrofurans, and chloramphenicol residues in raw milk samples preserved with 0.1% potassium dichromate (K2Cr2O7) and 0.05% mercuric bichloride (HgCl2) during cold storage for 7 days. Preserved milk samples fortified with 50 ppb of each antimicrobial were analyzed by liquid chromatography (modified AOAC Method 993.32). Drugs were extracted with chloroform-acetone after solvent evaporation residues were dissolved with aqueous sodium acetate buffer solution (0.02M, pH 4.8), and fat was removed with hexane. Sulfonamides and chloramphenicol were detected at 275 nm (UV) by using a gradient system of sodium acetate buffer solution-acetonitrile starting at 95 + 5 (v/v) and finishing at 80 + 20 (v/v). Nitrofurans were detected at 375 nm (UV) isocratically with sodium acetate buffer solution-acetonitrile (80 + 20, v/v). Residues stability was measured through recovery data. Sulfamethoxazole, sulfachloropyridazine, nitrofurazone, furazolidone, and furaltadone residues remained stable in the presence of either preservative for 7 days. Sulfamethazine and chloramphenicol were not affected by K2Cr2O7, but had significant losses (p <0.05) when HgCl2 was used: 26.2 and 13.4%, respectively. Average recoveries of sulfamonomethoxine, sulfamerazine, and sulfathiazole significantly decreased by Day 7, with losses of 17.1, 17.2, and 23.2% for K2Cr2O7, and 23.3, 20.7, and 48.0% for HgCl2, respectively. During 5 days of cold storage all antimicrobials tested, except sulfathiazole, remained stable in milk samples preserved with 0.1% K2Cr2O7 or 0.05% HgCl2. C1 Univ Autonoma Metropolitana Xochimilco, Dept Prod Agricola & Anim, Instrumental Anal Lab, Mexico City 04960, DF, Mexico. Univ Agraria La Habana, Fac Med Vet Autopista Nacl & Carretera Tapaste, Fac Med Vet, Havana, Cuba. RP Perez, N, Univ Autonoma Metropolitana Xochimilco, Dept Prod Agricola & Anim, Instrumental Anal Lab, Calzada Hueso 1100, Mexico City 04960, DF, Mexico. CR *AOAC INT, 1995, OFF METH AN AOAC INT *CODEX, 1995, RED MED VET AL *CODEX, 1995, RES MED VET AL, P76 *FIL IDF, 1988, 141 FIL IDF ACHESON RM, 1960, INTRO CHEM HETEROCYC, P322 BARTON D, 1979, COMPRENHENSIVE ORGAN, V4, P991 BECTOR BS, 1998, INDIAN DAIRYMAN, V50, P59 KAMAKAR B, 1997, CHEIRON, V26, P89 MOLINA MP, 1999, PRODUCCION ANIMAL, V20, P158 PEREZ N, 2002, J AOAC INT, V85, P20 PINTO M, 1996, METODES ANAL LECHE D, P53 NR 11 TC 4 PU AOAC INTERNATIONAL PI GAITHERSBURG PA 481 NORTH FREDRICK AVE, STE 500, GAITHERSBURG, MD 20877-2504 USA SN 1060-3271 J9 J AOAC INT JI J. AOAC Int. PD NOV-DEC PY 2002 VL 85 IS 6 BP 1415 EP 1419 PG 5 SC Chemistry, Analytical; Food Science & Technology GA 620GB UT ISI:000179524700027 ER PT J AU Munguia-Lopez, EM Peralta, E Gonzalez-Leon, A Vargas-Requena, C Soto-Valdez, H TI Migration of bisphenol A (BPA) from epoxy can coatings to Jalapeno peppers and an acid food simulant SO JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY LA English DT Article DE bisphenol A; epoxy resins; canned jalapeno peppers ID PLASTICS AB Effects of heat processing, storage time, and temperature on migration of bisphenol A (BPA) from an epoxy type can coating to an acid food simulant and jalapeno peppers were determined. Commercial jalapeno pepper cans (8 oz, dimensions 211 x 300) were stored at 25 degreesC for 40, 70, and 160 days. A solution of 3% acetic acid was canned in 211 x 300 cans from the same batch used for jalapeno peppers. Heat processing was applied to two-thirds of the cans, and the remaining cans were not heat processed. Cans were stored at 25 and 35 degreesC for 0, 40, 70, and 160 days. Results showed that there is a minimal effect of heat treatment. An effect of storage time on migration of EPA during the first 40 days at 25 degreesC was observed. An increase on migration of BPA was observed with storage time at 35 degreesC. The highest level of migration was 15.33 mug/kg of EPA at 160 days at 35 degreesC. A correction factor of similar to0.4 was calculated for migration under simulating conditions of storage compared to the real ones. The highest level of EPA found in jalapeno peppers cans, surveyed from three supermarkets, was 5.59 +/- 2.43 mug/kg. Migration of BPA, performed according to the European and Mercosur conditions, was 65.45 +/- 5.29 mug/kg. All the migration values found in this study were below those legislation limits (3 mg/kg). C1 Ctr Invest Alimentac & Desarrollo, Hermosillo 83000, Sonora, Mexico. RP Soto-Valdez, H, Ctr Invest Alimentac & Desarrollo, AC Apdo Postal 1735, Hermosillo 83000, Sonora, Mexico. CR *EC, 1982, OFFICIAL J EUR COM L, V297, P26 *EC, 1990, OFF J EUR COMMUNIT L, V75, P19 *MERC GMC, 1993, 8793 MERC GMC, P11 BILES JE, 1997, J AGR FOOD CHEM, V45, P3541 BILES JE, 1997, J AGR FOOD CHEM, V45, P4697 BROTONS JA, 1995, ENVIRON HEALTH PERSP, V103, P608 BUSH J, 1994, SPECTRA IDENTIFICATI, P80 FELDMAN D, 1995, ENVIRON HEALTH PE S7, V103, P129 FOOTITT RJ, 1995, CANNING FISH MEAT, P114 KRISHNAN AV, 1993, ENDOCRINOLOGY, V132, P2279 MUNGUIALOPEZ EM, 2001, J AGR FOOD CHEM, V49, P3666 PASEIROLOSADA J, 1993, FRESEN J ANAL CHEM, V345, P572 PASEIROLOSADA P, 1997, J AGR FOOD CHEM, V45, P3493 PHILO MR, 1997, FOOD ADDIT CONTAM, V14, P75 NR 14 TC 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0021-8561 J9 J AGR FOOD CHEM JI J. Agric. Food Chem. PD DEC 4 PY 2002 VL 50 IS 25 BP 7299 EP 7302 PG 4 SC Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology GA 621WC UT ISI:000179613200019 ER PT J AU Valverde, A Aguilera, A Rodriguez, M Boulaid, M Soussu-El Begrani, M TI Pesticide residue levels in peppers grown in a greenhouse after multiple applications of pyridaben and tralomethrin SO JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY LA English DT Article DE pyridaben; tralomethrin; residues; peppers ID CHROMATOGRAPHY AB Residue levels of pyridaben and tralomethrin were determined in peppers grown in an experimental greenhouse, during a 4 week period in which up to four successive treatments with both pesticides were applied. In all cases, plants were sprayed with a mixture of pyridaben and tralomethrin at application rates of active ingredients of 140 and 36 g/ha, respectively. Sampling was carried out at 1, 3, 7, 8, 10, or 14 days after each multiple application, simulating the typical harvesting practices in greenhouse plantations. Residue levels of pyridaben and tralomethrin were determined by using ethyl acetate extraction and GC-ECD. During the study, residue levels in the plantation ranged between 0.22 and 0.04 mg/kg for pyridaben and between 0.09 and 0.02 mg/kg for tralomethrin, with median values of 0.14 and 0.06 mg/kg, respectively. These values represent 28 and 600%, respectively, of the corresponding maximum reside limits currently established in Spain. The application of an intensive washing process to the pepper samples did not lead to a significant reduction of the residue level of either pesticide. Likewise, no significant differences were found between the residue levels in the "edible" and "inedible" parts of the peppers. C1 Univ Almeria, Fac Ciencias Expt, Pesticide Residue Res Grp, Almeria 04071, Spain. Univ Abdelmalek Essaadi, Fac Sci Tetouan, Dept Chem, Tetouan 93000, Mexico. RP Valverde, A, Univ Almeria, Fac Ciencias Expt, Pesticide Residue Res Grp, Almeria 04071, Spain. CR *IT MIN HLTH, 1998, DIR MIN 22 GENN 1998 *WHO, 1997, GUID PRED DIET INT P ANDERSSON A, 1998, RAPPORT, V17, P9 BURCHAT CS, 1998, FOOD ADDIT CONTAM, V15, P61 CABRAS P, 1998, J AGR FOOD CHEM, V46, P4255 DIMUCCIO A, 1997, J CHROMATOGR A, V765, P39 ELKINS ER, 1989, J ASSOC OFF ANA CHEM, V72, P533 FAJGELJ A, 2000, PRINCIPLES PRACTICES HILL ARC, 2000, SANCO31032000 EUR CO HIRATA K, 1995, J PESTIC SCI, V20, P177 HOLLAND PT, 1994, PURE APPL CHEM, V66, P335 TERUEL V, 1998, LIMITES MAXIMOS RESI TOMLIN C, 2000, PESTICIDE MANUAL VALVERDE A, 2002, J CHROMATOGR A, V943, P101 VICENTE CL, 2002, VADEMECUM PRODUCTOS NR 15 TC 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0021-8561 J9 J AGR FOOD CHEM JI J. Agric. Food Chem. PD DEC 4 PY 2002 VL 50 IS 25 BP 7303 EP 7307 PG 5 SC Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology GA 621WC UT ISI:000179613200020 ER PT J AU Bernardo, JM Rueda, R TI Bayesian hypothesis testing: a reference approach SO INTERNATIONAL STATISTICAL REVIEW LA English DT Article DE amount of information; decision theory; Lindley's paradox; loss function; model criticism; model choice; precise hypothesis testing; Rao's paradox; reference analysis; reference prior ID PARAMETERS; INFERENCE; PRIORS AB For any probability model M equivalent to {p(x\theta, omega), theta is an element of Theta, omega is an element of Omega} assumed to describe the probabilistic behaviour of data x is an element of X; it is argued that testing whether or not the available data are compatible with the hypothesis H-0 equivalent to (theta = theta(0)) is best considered as a formal decision problem on whether to use(a(0)), or not to use (a(1)), the simpler probability model (or null model) M-0 equivalent to {p(x\theta(0), omega), omega is an element of Omega}, where the loss difference L(a(0), theta, omega) - L(a(1), theta, omega) is proportional to the amount of information delta(theta(0), theta, omega) which would be lost if the simplified model MO were used as a proxy for the assumed model M. For any prior distribution pi(theta, omega), the appropriate normative solution is obtained by rejecting the null model MO whenever the corresponding posterior expectation integral integral delta(theta(0), theta, omega) pi(theta, omega \ x)dtheta domega is sufficiently, large. Specification of a subjective prior is always difficult, and often polemical, in scientific communication Information theory may be used to specify a prior, the reference prior, which only depends on the assumed model M, and mathematically describes a situation where no prior information is available about the quantity of interest. The reference posterior expectation, d(theta(0), x) = integral delta pi(delta \ x)ddelta, of the amount of information delta(theta(0), theta, omega) which could be lost if the null model were used, provides an attractive non-negative test function, the intrinsic statistic, which is invariant under reparametrization. The intrinsic statistic d(theta(0), x) is measured in units of information, and it is easily calibrated (for any sample size and any dimensionality) in terms of some average long-likelihood ratios.. The corresponding Bayes decision rule the Bayesian reference criterion (BRC), indicates that the null model M-0 should only be rejected if the posterior expected loss of information from using the simplified model M-0 is too large or, equivalently, if the associated expected average log-likelihood ratio is large enough. The BRC criterion provides a general reference Bayesian solution to hypothesis testing which does not assume a probability mass concentrated on M-0 and, hence, it is immune to Lindley's paradox. The theory is illustrated within the context of multivariate normal data, where it is shown to avoid Rao's paradox on the inconsistency between univariate and multivariate frequentist hypothesis testing. C1 Univ Valencia, Dept Estadist & 10, E-46100 Burjassot, Valencia, Spain. UNAM, IIMAS, Mexico City 01000, DF, Mexico. RP Bernardo, JM, Univ Valencia, Dept Estadist & 10, E-46100 Burjassot, Valencia, Spain. CR BERGER J, 1987, STAT SCI, V2, P317 BERGER JO, 1987, J AM STAT ASSOC, V82, P112 BERGER JO, 1989, J AM STAT ASSOC, V84, P200 BERGER JO, 1992, BAYESIAN STATISTICS, V4, P35 BERGER JO, 1998, STAT SINICA, V8, P359 BERNARDO JM, 1979, J ROY STAT SOC B MET, V41, P113 BERNARDO JM, 1980, BAYESIAN STAT, P605 BERNARDO JM, 1982, TRAB ESTADIST, V33, P16 BERNARDO JM, 1985, MODEL CHOICE, P43 BERNARDO JM, 1985, TRAB ESTADIST, V36, P45 BERNARDO JM, 1994, BAYESIAN THEORY BERNARDO JM, 1997, TRAB ESTADIST, V65, P159 BERNARDO JM, 1998, J ROY STAT SOC D-STA, V47, P101 BERNARDO JM, 1999, BAYESIAN STAT, V6, P101 CASELLA G, 1987, J AM STAT ASSOC, V82, P106 EDWARDS W, 1963, PSYCHOL REV, V70, P193 FERRANDIZ JR, 1985, BAYESIAN STAT, V2, P645 GOOD IJ, 1950, PROBABILITY WEIGHING GOOD IJ, 1983, GOOD THINKING FDN PR GUTIERREZPENA E, 1992, BAYESIAN STAT, V4, P669 HEALY MJR, 1969, BIOMETRICS, V25, P411 JAYNES ET, 1980, BAYESIAN STAT, P618 JAYNES ET, 1983, PAPERS PROBABILITY S, P378 JEFFREYS H, 1961, THEORY PROBABILITY JEFFREYS H, 1980, BAYESIAN ANAL ECONOM, P451 KADANE JB, 1984, ROBUSTNESS BAYESIAN, P1 KULLBACK S, 1951, ANN MATH STAT, V22, P79 KULLBACK S, 1959, INFORMATION THEORY S LINDLEY DV, 1957, BIOMETRIKA, V44, P187 LINDLEY DV, 1972, BAYESIAN STAT REV MATTHEWS RAJ, 2001, J STAT PLAN INFER, V94, P43 POLSON NG, 1995, BAYESIAN INFERENCE, P140 RAO CR, 1966, MULTIVARIATE ANAL, P87 RAO CR, 1973, LINEAR STAT INFERENC ROBERT CP, 1993, STAT SINICA, V3, P603 ROBERT CP, 1996, THEOR DECIS, V40, P191 RUEDA R, 1992, TEST, V1, P61 SHAFER G, 1982, J AM STAT ASSOC, V77, P325 NR 38 TC 4 PU INT STATISTICAL INST PI VOORBURG PA 428 PRINSES BEATRIXLAAN, 2270 AZ VOORBURG, NETHERLANDS SN 0306-7734 J9 INT STATIST REV JI Int. Stat. Rev. PD DEC PY 2002 VL 70 IS 3 BP 351 EP 372 PG 22 SC Statistics & Probability GA 621TW UT ISI:000179607900002 ER PT J AU Loukianov, AG Castillo-Toledo, B Dodds, S TI Robust stabilization of a class of uncertain system via block decomposition and VSC SO INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL LA English DT Article DE nonlinear systems; uncertain dynamic systems; decomposition methods; sliding mode control ID DYNAMICAL-SYSTEMS; CONTROL PRINCIPLE AB In this paper, a block decomposition procedure for sliding mode control of a class of nonlinear systems with matched and unmatched uncertainties, is proposed. Based on the nonlinear block control principle, a sliding manifold design problem is divided into a number of sub-problems of lower dimension which can be solved independently. As a result, the nominal parts of the sliding mode dynamics is linearized. A discontinuous feedback is then used to compensate the matched uncertainty. Finally, a step-by-step Lyapunov technique and a high gain approach is applied to obtain hierarchical fast motions on the sliding manifolds and to achieve the robustness property of the closed-loop system motion with respect to unmatched uncertainty. Copyright (C) 2002 John Wiley Sons, Ltd. C1 IPN, Ctr Invest & Estudios Avanzados, Guadalajara 44550, Jalisco, Mexico. Univ E London, Dept Elect & Elect Engn, Dagenham RM8 2AS, Essex, England. RP Castillo-Toledo, B, IPN, Ctr Invest & Estudios Avanzados, Apdo Postal 31-438,Plaza Luna, Guadalajara 44550, Jalisco, Mexico. CR CASTILLOTOLEDO B, 1993, SYSTEMS CONTROL LETT, V24, P361 CORLESS MJ, 1981, IEEE T AUTOMAT CONTR, V26, P1139 DECARLO RA, 1988, P IEEE, V26, P1139 DRAJENOVIC B, 1969, AUTOMATICA, V5, P287 DRAKUNOV SV, 1990, AUTOMAT REM CONTR, V51, P601 DRAKUNOV SV, 1990, AUTOMAT REM CONTR, V51, P737 ELMALI H, 1992, AUTOMATICA, V28, P1139 GOODALL DP, 1988, SIAM J CONTROL OPTIM, V26, P1431 GOODALL DP, 1994, LECT NOTES CONTROL I, V193 GUTMAN S, 1979, IEEE T AUTOMAT CONTR, V24, P437 KHALIL HK, 1996, NONLINEAR SYSTEMS KRSTIC M, 1995, NONLINEAR ADAPTIVE C LEITMANN G, 1979, ASME, V101, P212 LUKYANOV AG, 1982, AUTOMAT REM CONTR, V43, P872 LUKYANOV AG, 1993, P 2 EUR CONTR C GRON, P1853 LUKYANOV AG, 1998, AVTOMATIKA TELEMACHA, V5, P12 QU Z, 1994, P 33 C DEC CONTR, V4, P3452 RYAN EP, 1984, IMA J MATH CONTROL I, V1, P232 SPURGEON SK, 1993, INT J CONTROL, V57, P1107 UTKIN VI, 1978, SLIDING MODES THEIR ZINOBER ASI, 1990, DETERMINISTIC CONTRO NR 21 TC 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1049-8923 J9 INT J ROBUST NONLINEAR CONTR JI Int. J. Robust Nonlinear Control PD DEC 30 PY 2002 VL 12 IS 15 BP 1317 EP 1338 PG 22 SC Engineering, Electrical & Electronic; Mathematics, Applied; Automation & Control Systems GA 622PM UT ISI:000179655500004 ER PT J AU Rojas-Espinosa, O Wek-Rodriguez, K Arce-Paredes, P TI The effect of exogenous peroxidase on the evolution of murine leprosy SO INTERNATIONAL JOURNAL OF LEPROSY AND OTHER MYCOBACTERIAL DISEASES LA English DT Article ID MYCOBACTERIUM-TUBERCULOSIS; ALVEOLAR MACROPHAGES; MYELOPEROXIDASE; PATHOGENESIS; NEUTROPHILS; PHAGOCYTOSIS; MATURATION; PHAGOSOME; INFECTION; CAPACITY AB Mycobacterium lepraemurium (MLM) is a successful parasite of murine macrophages; in vitro, this microorganism infects macrophages without triggering these cells' ability to produce either the reactive oxygen intermediaries (ROI) or the reactive nitrogen intermediaries (RNI), and ends up lodging within these cells, that, in addition, do not contain myeloperoxidase (MPO). In this study, we analyzed the effect of exogenous peroxidase on the evolution of murine leprosy. Bacilli were intraperitoneally injected, either alone (MLM) or precoated with horseradish peroxidase (MLM-PO), into two different groups of mice. At two-week intervals, the groups were blood-sampled to measure the levels of antibodies to protein- or lipid-MLM antigens. The extent of the disease was also assessed by looking at the histopathologic changes that occurred both in the liver and the spleen of the infected animals. We found that the animals injected with MLM-PO developed a disease that evolved at a slower pace than the disease that occurred in the animals injected with intact MLM. The difference between groups, both in terms of antibody levels and histological changes, was clearly evident at the intermediate stages of the disease (2 to 2.5 months), but was not so obvious at the more advanced stage of 3 months. Several possibilities to explain how the PO-coated bacilli might have regained their infectiousness are discussed. Lowering the infective dose of MLM and MLM-PO from 5 x 101 bacilli to 5 x 106 bacilli would, probably, have resulted in a different outcome of the disease: more extended in the MLM-group than in the MLM-PO group. C1 Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Dept Inmunol, Mexico City 11340, DF, Mexico. Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Dept Biochem Engn, Mexico City 11340, DF, Mexico. RP Rojas-Espinosa, O, Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Dept Inmunol, Carpio & Plan Ayala,Colonia Santo Tomas, Mexico City 11340, DF, Mexico. CR BORELLI V, 1999, INFECT IMMUN, V67, P4149 BROWN AE, 1987, J INFECT DIS, V156, P985 CLEMENS DL, 1995, J EXP MED, V181, P257 DANNENBERG AM, 1975, MONONUCLEAR PHAGOCYT, P959 DANNENBERG AM, 1994, IMMUNOBIOLOGY, V191, P461 DRAPER P, 1980, 5 M SCI WORK GROUP I FERRARI G, 1999, CELL, V97, P435 FOLCH J, 1957, J BIOL CHEM, V226, P497 GAUT JP, 2001, P NATL ACAD SCI USA, V98, P11961 GLICKMAN MS, 2001, CELL, V104, P477 GOMEZESTRADA H, 1983, ARCH INVEST MED, V14, P127 JACKETT PS, 1978, J GEN MICROBIOL, V107, P273 JONES GS, 1990, J INFECT DIS, V162, P700 KEANE J, 2000, J IMMUNOL, V164, P2016 KLEBANOFF SJ, 1978, CIBA F SYMP, V65, P263 KLEBANOFF SJ, 1984, INFECT IMMUN, V44, P534 KLEBANOFF SJ, 1999, P ASSOC AM PHYSICIAN, V111, P383 KRAHENBUHL J, 2000, LEPROSY REV S, V71, S170 LEFKOWITZ SS, 1996, J INFECT DIS, V173, P1202 LINCOLN JA, 1995, INFECT IMMUN, V63, P3042 MARODI L, 1998, INFECT IMMUN, V66, P2750 MASLOV AK, 1988, ARKH PATOL, V50, P51 MASLOV AK, 2000, B EXP BIOL MED+, V129, P484 MASLOV AK, 2000, INT J LEPROSY, V68, P71 MASLOV AK, 2001, INT J LEPROSY, V69, P49 MCKEEVER PE, 1978, AM J TROP MED HYG, V27, P1019 MODLIN RL, 1986, J IMMUNOL, V137, P2831 MODLIN RL, 1994, J INVEST DERMATOL, V102, P828 MYRVIK QN, 1984, AM REV RESPIR DIS, V129, P322 PRABHAKARAN K, 1976, INT J LEPROSY, V44, P58 RAMASESH N, 1991, INFECT IMMUN, V59, P2864 REEVES EP, 2002, NATURE, V416, P291 ROJASESPINOSA O, 1988, INT J LEPROSY, V56, P428 ROJASESPINOSA O, 1988, J LEUKOCYTE BIOL, V43, P468 ROJASESPINOSA O, 1998, INT J LEPROSY, V66, P365 ROJASESPINOSA O, 1999, INT J LEPROSY, V67, P453 SBARRA AM, 1976, ADV EXP MED BIOL, V73, P191 SCHULTZ J, 1962, ARCH BIOCHEM BIOPHYS, V96, P465 SHARP AK, 1986, INFECT IMMUN, V54, P597 SHEPHERD VL, 1986, SEMIN RESPIR INFECT, V1, P99 SIELING PA, 1994, IMMUNOBIOLOGY, V191, P378 STENGER S, 2001, SCAND J INFECT DIS, V33, P483 STURGILLKOSZYCKI S, 1994, SCIENCE, V263, P678 VANVOORHIS WC, 1982, NEW ENGL J MED, V307, P1593 VIA LE, 1997, J BIOL CHEM, V272, P13326 NR 45 TC 0 PU INT JOURNAL LEPROSY PI GREENVILLE PA BUSINESS & CIRCULATION OFFICE, 1 ALM WAY, GREENVILLE, SC 29601-9999 USA SN 0148-916X J9 INT J LEPR MYCOBACT DIS JI Int. J. Lepr. Other Mycobact. Dis. PD SEP PY 2002 VL 70 IS 3 BP 191 EP 200 PG 10 SC Microbiology; Pathology; Tropical Medicine GA 622KD UT ISI:000179645500004 ER PT J AU Ni, FB Cavazos, T Hughes, MK Comrie, AC Funkhouser, G TI Cool-season precipitation in the southwestern USA since AD 1000: Comparison of linear and nonlinear techniques for reconstruction SO INTERNATIONAL JOURNAL OF CLIMATOLOGY LA English DT Article DE tree-ring reconstructions; climate variables; droughts; wet periods; southwest; neural networks ID DECADAL CLIMATE VARIABILITY; CONTIGUOUS UNITED-STATES; LARGE-SCALE CIRCULATION; WESTERN NORTH-AMERICA; DENDROCLIMATIC RECONSTRUCTIONS; NEURAL NETWORKS; SIERRA-NEVADA; TREE GROWTH; TEMPERATURE; RAINFALL AB A 1000 year reconstruction of cool-season (November-April) precipitation was developed for each climate division in Arizona and New Mexico from a network of 19 tree-ring chronologies in the southwestern USA. Linear regression (LR) and artificial neural network (NN) models were used to identify the cool-season precipitation signal in tree rings. Using 1931-88 records, the stepwise LR model was cross-validated with a leave-one-out procedure and the NN was validated with a bootstrap technique. The final models were also independently validated using the 1896-1930 precipitation data. In most of the climate divisions, both techniques can successfully reconstruct dry and normal years, and the NN seems to capture large precipitation events and more variability better than the LR. In the 1000 year reconstructions. the NN also produces more distinctive wet events and more variability, whereas the LR produces more distinctive dry events. The 1000 year reconstructed precipitation from the two models shows several sustained dry and wet periods comparable to the 1950s drought (e.g. 16th century mega drought) and to the post-1976 wet period (e.g. 1330s, 1610s). The impact of extreme periods on the environment may be stronger during sudden reversals from dry to wet, which were not uncommon throughout the millennium, such as the 1610s wet interval that followed the 16th century mega drought. The instrumental records suggest that strong dry to wet precipitation reversals in the past 1000 years might be linked to strong shifts from cold to warm El Nino-southern oscillation events And from a negative to positive Pacific decadal oscillation. Copyright (C) 2002 Royal Meteorological Society. C1 Univ Arizona, Tree Ring Res Lab, Tucson, AZ 85721 USA. Univ Arizona, Dept Geog & Reg Dev, Tucson, AZ 85721 USA. CICESE, Dept Oceanog Fis, Mexico City, DF, Mexico. RP Ni, FB, Univ Arizona, Tree Ring Res Lab, Tucson, AZ 85721 USA. 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J. Climatol. PD NOV 15 PY 2002 VL 22 IS 13 BP 1645 EP 1662 PG 18 SC Meteorology & Atmospheric Sciences GA 621FZ UT ISI:000179579000004 ER PT J AU Sheth, HC Torres-Alvarado, IS Verma, SP TI What is the "calc-alkaline rock series"? SO INTERNATIONAL GEOLOGY REVIEW LA English DT Article ID MEXICAN VOLCANIC BELT; PLUME-RELATED MAGMATISM; ISLAND BASALT TYPE; CHEMICAL CLASSIFICATION; CRUSTAL STRUCTURE; SOUTHERN MEXICO; ACTIVE MARGIN; FLOOD BASALTS; ARC BASALT; GEOCHEMISTRY AB The "calc-alkaline" series of rocks was originally defined in the early 1930s on the basis of the "alkali-lime index" on a combined SiO2 versus (Na2O + K2O) and SiO2 versus CaO plot. The usage of the term has evolved considerably since, anti today it is used variably for the subalkalic basalt-andesite-dacite-rhyolite Suite, or any rock suite containing andesite. or island-are rocks. or rocks with high ratios of large-ion-lithophile elements (LILE) to high-field-strength elements (HFSE), or simply rocks with negative HFSE anomalies (e.g., Nb-Ta) in primitive mantle-normalized multielement diagrams. Although such variable usage is normal in science, the use of certain geochemical variation diagrams to define and depict the calc-alkaline series is not strictly appropriate. Two of these widely used diagrams are the total alkalies-silica (TAS) diagram and the (Na2O + K2O)-FeO*-MgO (AFM) triangular diagram, neither of which has calcium as one of the plotting parameters. The TAS diagram can be used to depict "alkaline," "subalkaline," and probably "transitional" rocks, but not "calc-alkaline" or "high-alumina" rocks. Care must be taken while using such diagrams for rock classification, inasmuch as some of them are inherently unsuitable and several together may classify even a single rock into widely different associations. "Association" or "suite" are probably better terms than "series." because they imply neither comagmatic relationships nor linear trends. The calc-alkaline suite of rocks is abundant along destructive plate margins, but calc-alkaline geochemistry is not a 100% foolproof indicator of subduction processes, inasmuch as calc-alkaline rocks are also known from regions undergoing extension, such as the Basin and Range province and the Gulf of California. Therefore, caution must be exercised in interpreting ancient terrains with complicated geology and calc-alkaline rocks as former subduction zones. Not all orogenic andesites are calc-alkaline, and not all calc-alkaline andesites are orogenic. C1 Univ Nacl Autonoma Mexico, Ctr Invest Energia, Temixco 62580, Morelos, Mexico. Univ Nacl Autonoma Mexico, Ctr Invest Energia, Temixco 62580, Morelos, Mexico. RP Torres-Alvarado, IS, Univ Nacl Autonoma Mexico, Ctr Invest Energia, Priv Xochicalco S-N,Col Centro,AP 34, Temixco 62580, Morelos, Mexico. 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Geol. Rev. PD AUG PY 2002 VL 44 IS 8 BP 686 EP 701 PG 16 SC Geology GA 620JY UT ISI:000179531300002 ER PT J AU Gonzalez-Partida, E Carrillo-Chavez, A Grimmer, JOW Pironon, J TI Petroleum-rich fluid inclusions in fluorite, Purisima mine, Coahuila, Mexico SO INTERNATIONAL GEOLOGY REVIEW LA English DT Article ID MINERALIZATION AB Mexico has been a world leader in fluorite production. This study demonstrates a genetic link between petroleum basinal fluids and fluorite deposits. Fluid inclusions in fluorite from the La Purisima mine, northeast Mexico, were analyzed using UV-fluorescence, petrographic, and microthermometric techniques. Three different populations of inclusions were identified: (1) petroleum-rich (L-1 + V); (2) aqueous-rich (L-2 + V), and (3) immiscible liquids (L-1 + L-2 + V), where L-1 is liquid hydrocarbon, L-2 is a brine, and V is vapor phase. The L-2 + V inclusions are primary, whereas the L-1 + V and the L-1 + L-2 + V are pseudo- secondary. Some of the L-1 + V petroleum-rich inclusions show necking down and leakage. Frequently, these inclusions contain a solid phase composed of heavy hydrocarbons (solid bitumens?). At low temperature, the petroleum-rich L-1 + V inclusions were unaffected by freezing, and it was only possible to measure ice melting temperature (Tm = -10.2degreesC) in one three-phase, petroleum-rich inclusion (L-1 + L-2 + V), which corresponds to a salinity of 14.15 wt% NaCl equivalent. UV-fluorescence micro-thermometry indicates the presence of light dim heavy hydrocarbons in the oily inclusions. During heating runs. these oil-bearing inclusions have homogenization temperatures between 50degrees and 150degreesC. The aqueous-rich L-2 + V inclusions range ill salinity from 5.7 to 18.13 wt. % NaCl equivalent with homogenization temperature ranging front 75degrees to 155degreesC. These inclusions show white fluoreseence under UV indicative of a brine. The salinity and homogenization temperature of all the inclusions are similar to those of Mississippi Valley-type (MVT) deposits and petroleum basins. In this Study, we interpreted the Upper Jurassic rock sequence of the Chihuahua-Sabinas basin to be the source of the oil-trapped inclusions, and very likely, of some of the fluorine. The alkaline magmatism of the Trans-Pecos Province was the source of mineralizing fluids, and hence, of some of the fluorine too. This event remobilized the petroleum brine and hydrocarbons trapped as fluid inclusions within fluorite. C1 Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla 76230, Qro, Mexico. Unvi Henri Poincare Nancy 1, Fac Sci, CREGU, F-54501 Vandoeuvre Les Nancy, France. RP Gonzalez-Partida, E, Univ Nacl Autonoma Mexico, Ctr Geociencias, Campus Juriquilla AP 1-742, Juriquilla 76230, Qro, Mexico. 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Geol. Rev. PD AUG PY 2002 VL 44 IS 8 BP 755 EP 764 PG 10 SC Geology GA 620JY UT ISI:000179531300005 ER PT J AU Li, XO Yu, W TI Dynamic system identification via recurrent multilayer perceptrons SO INFORMATION SCIENCES LA English DT Article DE system identification; function approximation; recurrent multilayer perceptrons ID NEURAL NETWORKS; ADAPTIVE-CONTROL AB In this paper continuous-time recurrent multilayer perceptrons (RMLP) are proposed to identify nonlinear systems. Using the function approximation theorem for multilayer perceptrons (MLP), we conclude that RMLP can approximate any dynamic system in any degree of accuracy. By means of a Lyapunov-like analysis, a stable learning algorithm for RMLP is determined. The suggested learning algorithm is similar to the well-known backpropagation rule of the MLP but with an additional term which assure the stability of identification error. (C) 2002 Elsevier Science Inc. All rights reserved. C1 CINVESTAV, IPN, Dept Automat Control, Mexico City 07360, DF, Mexico. CINVESTAV, IPN, Dept Ingn Elect, Secc Computac, Mexico City 07360, DF, Mexico. RP Yu, W, CINVESTAV, IPN, Dept Automat Control, AP 14-740,Av IPN 2508, Mexico City 07360, DF, Mexico. 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PD NOV PY 2002 VL 147 IS 1-4 BP 45 EP 63 PG 19 SC Computer Science, Information Systems GA 620JQ UT ISI:000179530600003 ER PT J AU Cristan, AC Walden, AT TI Multitaper power spectrum estimation and thresholding: Wavelet packets versus wavelets SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article DE estimation; spectral analysis; statistics; time series; wavelet transforms ID NOISE AB Recently, it was suggested that spectrum estimation can be accomplished by applying wavelet denoising methodology to wavelet packet coefficients derived from the logarithm of a spectrum estimate. The particular algorithm we consider consists of computing the logarithm of the multitaper spectrum estimator, applying an orthonormal transform derived from a wavelet packet tree to the log multitaper spectrum ordinates, thresholding the empirical wavelet packet coefficients, and then inverting the transform. For a small number of tapers, suitable transforms/partitions for the logarithm of the multitaper spectrum estimator are derived using a method matched to statistical thresholding properties. The partitions thus derived starting from different stationary time series are all similar and easily derived, and any differences between the wavelet packet and discrete wavelet transform (DWT) approaches are minimal. For a larger number of tapers, where the chosen parameters satisfy the conditions of a proven theorem, the simple DWT again emerges as appropriate. Hence, using our approach to thresholding and the method of partitioning, we conclude that the DWT approach is a very adequate wavelet-based approach and that the use of wavelet packets is unnecessary. C1 Natl Autonomous Univ Mexico, Inst Invest Matemat Aplicados & Sistemas, Mexico City 04510, DF, Mexico. Univ London Imperial Coll Sci Technol & Med, Dept Math, London, England. RP Cristan, AC, Natl Autonomous Univ Mexico, Inst Invest Matemat Aplicados & Sistemas, Mexico City 04510, DF, Mexico. 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Signal Process. PD DEC PY 2002 VL 50 IS 12 BP 2976 EP 2986 PG 11 SC Engineering, Electrical & Electronic GA 621VD UT ISI:000179611000007 ER PT J AU Pisarchik, AN Kuntsevich, BF TI Control of multistability in a directly modulated diode laser SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article DE amplitude modulation; nonlinear systems; semiconductor lasers ID SEMICONDUCTOR-LASERS; COEXISTING ATTRACTORS; SYSTEM; SYNCHRONIZATION; PARAMETER; ORBITS AB A semiconductor laser with modulated injection current has the property that many competing behaviors are possible and the system tends to alternate among them. Such a situation is not desirable if a stable output is required. We show with numerical simulations that additional slow harmonic modulation can annihilate undesirable coexisting attractors in this laser. We demonstrate great flexibility of the method in manipulating the laser's dynamics to select a desired behavior and even to make the system monostable. C1 Ctr Invest Opt, Guanajuato 37150, Mexico. Natl Acad Sci, BI Stepanov Inst Phys, Minsk 220072, Byelarus. RP Pisarchik, AN, Ctr Invest Opt, Guanajuato 37150, Mexico. 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Quantum Electron. PD DEC PY 2002 VL 38 IS 12 BP 1594 EP 1598 PG 5 SC Engineering, Electrical & Electronic; Physics, Applied GA 622KV UT ISI:000179647000005 ER PT J AU Rupp, H Zarain-Herzberg, A Maisch, B TI The use of partial fatty acid oxidation inhibitors for metabolic therapy of angina pectoris and heart failure SO HERZ LA English DT Review DE heart failure; angina pectoris; metabolism; fatty acid oxidation; glucose oxidation; gene expression ID PROLIFERATOR-ACTIVATED RECEPTOR; BUTYROBETAINE HYDROXYLASE INHIBITOR; SARCOPLASMIC-RETICULUM CA2+-ATPASE; PALMITOYLTRANSFERASE-I INHIBITION; LEFT-VENTRICULAR DYSFUNCTION; CARDIAC HYPERTROPHIC GROWTH; LONG-CHAIN ACYLCARNITINE; MYOCARDIAL INFARCT SIZE; DENERVATED DOG HEART; OVERLOADED RAT-HEART AB Background: Partial fatty acid oxidation inhibitors have raised great interest since they are expected to counteract a dysregulated gene expression of hypertrophied cardiocytes. Some of these compounds have been developed for treating non-insulin-dependent diabetes mellitus and stable angina pectoris. A shift from fatty acid oxidation to glucose oxidation leads to a reduced gluconeogenesis and improved economy of cardiac work. An increased glucose oxidation can be achieved with the following enzyme inhibitors: etomoxir, oxfenicine, methyl palmoxirate, S-15176, metoprolol, amiodarone, perhexiline (carnitine palmitoyltransferase-1); aminocarnitine, perhexiline (carnitine palmitoyltransferase-2); hydrazonopropionic acid (carnitine-acylcarnitine translocase); MET-88 (gamma-butyrobetaine hydroxylase); 4-bromocrotonic acid, trimetazidine, possibly ranolazine (thiolases); hypoglycin (butyryl-CoA dehydrogenase); dichloroacetate (pyruvate dehydrogenase kinase). Clinical Trials with trimetazidine and ranolazine showed that this shift in substrate oxidation has an antianginal action. Etomoxir and MET-88 improved the function of overloaded hearts by increasing the density of the Ca2+ pump of sarcoplasmic reticulum (SERCA2). The promoters of SERCA2 and alpha-myosin heavy-chain exhibit sequences which are expected to respond to transcription factors responsive to glucose metabolites and/or peroxisome proliferator-responsive element (PPAR) agonists. Further progress in elucidating novel compounds which upgregulate SERCA2 expression is closely linked to the characterization of regulatory sequences of the SERCA2 promoter. C1 Univ Marburg, Dept Internal Med & Cardiol, Mol Cardiol Lab, D-35033 Marburg, Germany. Univ Nacl Autonoma Mexico, Fac Med, Dept Bioquim, Mol Biol Lab, Mexico City 04510, DF, Mexico. RP Rupp, H, Univ Marburg, Dept Internal Med & Cardiol, Mol Cardiol Lab, Karl Von Frisch Str 1, D-35033 Marburg, Germany. 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SN, 1998, TERAPEVT ARKH, V70, P41 THADANI U, 1994, CIRCULATION, V90, P726 TURCANI M, 1997, CIRCULATION, V96, P3681 VANBILSEN M, 1998, PFLUG ARCH EUR J PHY, V437, P2 VANDERLEE KAJM, 2000, J LIPID RES, V41, P41 VANDERVUSSE GJ, 1992, PHYSIOL REV, V72, P81 VANDERVUSSE GJ, 1998, CARDIOVASC RES, V37, P160 VETTER R, 1994, AM J PHYSIOL-HEART C, V267, H2091 VETTER R, 1995, EUR HEART J, V16, P15 VIKMO H, 1981, ARZNEIMITTEL-FORSCH, V31, P1088 VIKMO H, 1986, AM HEART J, V111, P1048 WAMBOLT RB, 2000, J AM COLL CARDIOL, V36, P1378 WAYMAN NS, 2002, FASEB J, V16, P1027 WOLF HPO, 1985, EUR J BIOCHEM, V146, P359 WOLFF AA, 2002, HEART FAIL REV, V7, P187 XIAO O, 2002, AM J PHYSIOL, V283, H213 XIAO QX, 1998, J MOL CELL CARDIOL, V30, P87 YAO KW, 1994, CHEM-BIOL INTERACT, V90, P225 YONEKURA K, 2000, BASIC RES CARDIOL, V95, P343 YOUNG ME, 2001, FASEB J, V15, P833 YOUNG ME, 2001, J BIOL CHEM, V276, P44390 ZACHAROWSKI K, 2001, EUR J PHARMACOL, V418, P105 ZARAINHERZBERG A, 1996, FASEB J, V10, P1303 ZARAINHERZBERG A, 1999, AM J CARDIOL, V83, H31 ZARAINHERZBERG A, 2002, EXPERT OPIN INV DRUG, V11, P345 NR 158 TC 13 PU URBAN & VOGEL PI MUNICH PA NEUMARKTER STRASSE 43, D-81673 MUNICH, GERMANY SN 0340-9937 J9 HERZ JI Herz PD NOV PY 2002 VL 27 IS 7 BP 621 EP 636 PG 16 SC Cardiac & Cardiovascular Systems GA 620NJ UT ISI:000179539200007 ER PT J AU Martinez, HR Rangel-Guerra, RA Cantu-Martinez, L Garza-Gomez, J Gonzalez, HC TI Cardiac headache: Hemicranial cephalalgia as the sole manifestation of coronary ischemia SO HEADACHE LA English DT Article DE cardiac headache; cardiac cephalgia; exertional headache; neural convergence; anginal headache ID ANGINA C1 UANL, Neurol Serv, Hosp Univ, Monterrey 64460, NL, Mexico. Hosp Univ, Study Grp Neurol Dis, Monterrey 64460, NL, Mexico. RP Martinez, HR, UANL, Neurol Serv, Hosp Univ, Ave Madero & Gonzalitos,Colonia Miltras Ctr,AP 43, Monterrey 64460, NL, Mexico. CR *HEAD CLASS COMM I, 1988, CEPHALALGIA S, V7, P1 AMENDO MT, 2001, AM J GERIATR CARDIOL, V10, P100 BLACKY RA, 1987, AM J CARDIOL, V60, P730 BOWEN J, 1993, HEADACHE, V33, P238 FLEETCROFT R, 1985, J ROY SOC MED, V78, P676 FOREMAN RD, 1980, AM J PHYSIOL, V238, P667 GRACE A, 1997, CEPHALALGIA, V17, P195 ISHIDA A, 1996, JPN HEART J, V37, P261 LANZA GA, 2000, LANCET, V356, P998 LEFKOWITZ D, 1982, ARCH NEUROL-CHICAGO, V39, P130 LIPTON RB, 1997, NEUROLOGY, V49, P813 SAMPSON JJ, 1971, PROGR CARDIOVASC DIS, V13, P507 TAKAYANAGI K, 1990, JPN HEART J, V31, P503 VERNAY D, 1989, HEADACHE, V29, P350 NR 14 TC 2 PU BLACKWELL PUBLISHING INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0017-8748 J9 HEADACHE JI Headache PD NOV-DEC PY 2002 VL 42 IS 10 BP 1029 EP 1032 PG 4 SC Clinical Neurology GA 619TH UT ISI:000179493200010 ER PT J AU Bellini, M TI Fresh inflation from five-dimensional vacuum state SO GENERAL RELATIVITY AND GRAVITATION LA English DT Article DE inflationary cosmology; higher-dimensional model ID KALUZA-KLEIN SOLITONS; QUANTUM-FIELD-THEORY; WARM INFLATION; COSMOLOGICAL MODELS; MATTER; FLUCTUATIONS; TEMPERATURE; SCENARIO; GAUGE AB I study fresh inflation from a five-dimensional vacuum state, where the fifth dimension is constant. In this framework, the universe can be seen as inflating in a four-dimensional Friedmann-Robertson-Walker metric embedding in a five-dimensional metric. Finally, the experimental data n(s) = 1 (BOOMERANG-98 and MAXIMA-1, taken together COBE DMR), are consistent with p+rhot/rhot similar or equal to 1/3 in the fresh inflationary scenario. C1 Univ Michoacana San Nicolas de Hildalgo, Inst Fis & Matemat, Morelia 58041, Michoacan, Mexico. RP Bellini, M, Univ Michoacana San Nicolas de Hildalgo, Inst Fis & Matemat, AP 2-82, Morelia 58041, Michoacan, Mexico. CR BELLINI M, 1998, PHYS LETT B, V428, P31 BELLINI M, 1998, PHYS REV D, V58 BELLINI M, 1999, NUCL PHYS B, V563, P245 BELLINI M, 2001, PHYS REV D, V63 BELLINI M, 2001, PHYS REV D, V64 BERERA A, 1995, PHYS REV LETT, V75, P3218 BERERA A, 1998, PHYS REV D, V58 BUNCH TS, 1978, P ROY SOC LOND A MAT, V360, P117 DELEON JP, 1988, GEN RELAT GRAVIT, V20, P539 DEOLIVEIRA HP, 1998, PHYS REV D, V57, P741 EINSTEIN A, 1956, MEANING RELATIVITY, P129 JAFFE AH, 2001, PHYS REV LETT, V86, P3475 LINDE AD, 1990, PARTICLE PHYSICS INF LIU HY, 1992, J MATH PHYS, V33, P3888 MCMANUS DJ, 1994, J MATH PHYS, V35, P4889 SALAM A, 1980, REV MOD PHYS, V52, P525 WEINBERG S, 1974, PHYS REV D, V9, P3357 WESSON P, 1993, PHYS LETT B, V298, P69 WESSON PS, 1990, GEN RELAT GRAVIT, V22, P707 WESSON PS, 1992, ASTROPHYS J, V394, P19 WESSON PS, 1992, J MATH PHYS, V33, P3883 WESSON PS, 1992, PHYS LETT B, V276, P299 NR 22 TC 2 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0001-7701 J9 GEN RELATIV GRAVIT JI Gen. Relativ. Gravit. PD JAN PY 2003 VL 35 IS 1 BP 35 EP 41 PG 7 SC Physics, Multidisciplinary GA 621GQ UT ISI:000179580500004 ER PT J AU Lopez-Ortega, A TI Entropy of the Kerr black hole arising from Rarita-Schwinger field SO GENERAL RELATIVITY AND GRAVITATION LA English DT Article DE black hole; entropy; brick wall model; Rarita-Schwinger field ID BRICK-WALL MODEL; QUANTUM ENTROPY AB Using the Newman-Penrose formalism and the brick wall model the entropy of a Kerr black hole due to a massless Rarita-Schwinger field is calculated. The dependence of the subleading correction with the spin is analyzed and the differences with previously published results are discussed. C1 IPN, CINVESTAV, Dept Fis, Mexico City 07000, DF, Mexico. RP Lopez-Ortega, A, IPN, CINVESTAV, Dept Fis, Apartado Postal 14-740, Mexico City 07000, DF, Mexico. CR BEKENSTEIN JD, 1972, LETT NUOVO CIMENTO, V4, P737 BEKENSTEIN JD, 1973, PHYS REV D, V7, P2333 BELGIORNO F, 1996, PHYS REV D, V53, P3172 BELGIORNO F, 1996, PHYS REV D, V53, P7073 COGNOLA G, 1998, PHYS REV D, V57, P1108 DELCASTILLO GFT, 1988, J MATH PHYS, V30, P446 DELCASTILLO GFT, 1990, PHYS REV D, V42, P4082 GAO CJ, 2002, PHYS REV D B, V65 GHOSH A, 1994, PHYS REV LETT, V73, P2521 GHOSH A, 1995, PHYS LETT B, V357, P295 GUVEN R, 1980, PHYS REV D, V22, P2327 HAWKING SW, 1974, NATURE, V248, P30 HAWKING SW, 1975, COMMUN MATH PHYS, V43, P199 HO J, 1997, CLASSICAL QUANT GRAV, V14, P2617 JING JL, 1999, PHYS REV D, V60 JING JL, 2000, INT J THEOR PHYS, V39, P1687 JING JL, 2000, PHYS REV D, V61 JING JL, 2001, PHYS REV D, V63 JING JL, 2001, PHYS REV D, V64 LEE MH, 1996, PHYS LETT A, V212, P323 LEE MH, 1996, PHYS REV D, V54, P3904 MUKOHYAMA S, 1998, PHYS REV D, V58 MUKOHYAMA S, 2000, PHYS REV D, V61 NEWMAN E, 1962, J MATH PHYS, V3, P556 PENROSE R, 1984, SPINORS SPACE TIME, V1 SHEN YG, 2000, GEN RELAT GRAVIT, V32, P1647 SHEN YG, 2000, GEN RELAT GRAVIT, V32, P2269 SHEN YG, 2000, PHYS LETT A, V266, P234 SUSSKIND L, 1994, PHYS REV D, V50, P2700 TEUKOLSKY SA, 1973, ASTROPHYS J, V185, P635 THOOFT G, 1985, NUCL PHYS B, V256, P727 WENBIAO L, 2000, PHYS REV D, V61 ZHONGHENG L, 2000, PHYS REV D, V62 NR 33 TC 3 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0001-7701 J9 GEN RELATIV GRAVIT JI Gen. Relativ. Gravit. PD JAN PY 2003 VL 35 IS 1 BP 59 EP 68 PG 10 SC Physics, Multidisciplinary GA 621GQ UT ISI:000179580500006 ER PT J AU Molina-Aja, A Garcia-Gasca, A Abreu-Grobois, A Bolan-Mejia, C Roque, A Gomez-Gil, B TI Plasmid profiling and antibiotic resistance of Vibrio strains isolated from cultured penaeid shrimp SO FEMS MICROBIOLOGY LETTERS LA English DT Article DE plasmid profiling; shrimp; antibiotic resistance; Vibrio ID DRUG-RESISTANCE; ANGUILLARUM; SEROVAR; AYU AB Resistance to different antibiotics was found in 26 of the 30 strains analyzed, more than 70% of the strains analyzed were resistant to carbenicillin and ampicillin and a significant correlation was found between the resistance to both antibiotics. Plasmids were found in 80% of the strains analyzed, and 11 different plasmid profiles were observed. The most common profile obtained had only a 21.2-kbp plasmid, a significant correlation was found between the presence of this plasmid and resistance to carbenicillin, although some exceptions could be detected. Plasmids were cured from a cephalothin resistant strain and reintroduced into the plasmid-free cell and into Escherichia coli kDH5alpha, both strains gained resistance to this antibiotic. (C) 2002 Published by Elsevier Science B.V. on behalf of the Federation of European Microbiological Societies. C1 CIAD, Mazatlan Unit Aquaculture, Mazatlan 82000, Sinaloa, Mexico. UNAM, Unidad Acad Mazatlan, Inst Ciencias Mar & Limnol, Mazatlan 82000, Sinaloa, Mexico. RP Gomez-Gil, B, State Univ Ghent, Microbiol Lab, KL Ledeganckstr 35, B-9000 Ghent, Belgium. CR ABRAHAM TJ, 1997, J AQUACULT TROP, V12, P1 ALSINA M, 1994, J APPL BACTERIOL, V76, P79 AOKI T, 1984, MICROBIOL IMMUNOL, V28, P1 BHATTACHARYA M, 2000, MICROB DRUG RESIST, V6, P171 HADA HS, 1984, VIBRIOS ENV, P183 LESMANA M, 2001, DIAGN MICR INFEC DIS, V39, P71 LI J, 1999, MAR POLLUT BULL, V39, P245 MITOMA Y, 1984, PLASMID, V12, P143 PEDERSEN K, 1995, ACTA VET SCAND, V36, P55 PEDERSEN K, 1996, EPIDEMIOL INFECT, V117, P471 PEDERSEN L, 1999, THESIS ROYAL VET AGR RADU S, 1998, FEMS MICROBIOL LETT, V165, P139 RHEINHEIMER G, 1992, AQUATIC MICROBIOLOGY ROQUE A, 2001, INT J ANTIMICROB AG, V17, P383 SORUM H, 1990, APPL ENVIRON MICROB, V56, P1033 TIAINEN T, 1995, J APPL BACTERIOL, V79, P384 TORANZO AE, 1983, INFECT IMMUN, V39, P184 ZHAO JA, 1992, NIPPON SUISAN GAKK, V58, P1523 NR 18 TC 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1097 J9 FEMS MICROBIOL LETT JI FEMS Microbiol. Lett. PD JUL 16 PY 2002 VL 213 IS 1 BP 7 EP 12 PG 6 SC Microbiology GA 580DH UT ISI:000177219100002 ER PT J AU Bashan, Y de-Bashan, LE TI Reduction of bacterial speck (Pseudomonas syringae pv. tomato) of tomato by combined treatments of plant growth-promoting bacterium, Azospirillum brasilense, streptomycin sulfate, and chemo-thermal seed treatment SO EUROPEAN JOURNAL OF PLANT PATHOLOGY LA English DT Article DE Azospirillum brasilense; bacterial leaf diseases; biological control; disease control; induced systemic resistance; plant growth-promoting bacteria; Pseudomonas syringae pv. tomato; seed treatment ID SYSTEMIC RESISTANCE; DISEASE RESISTANCE; FIELD CONDITIONS; SALICYLIC-ACID; RHIZOSPHERE BACTERIA; INDUCTION; RHIZOBACTERIA; CUCUMBER; PEPPER; LEAVES AB Inoculation of tomato seeds with the plant growth-promoting bacterium Azospirillum brasilense, or spraying tomato foliage with A. brasilense, streptomycin sulfate, or commercial copper bactericides, separately, before or after inoculation with Pseudomonas syringae pv. tomato, the casual agent of bacterial speck of tomato, had no lasting effect on disease severity or on plant height and dry weight. Seed inoculation with A. brasilense combined with a single streptomycin foliar treatment and two foliar bactericide applications at 5-day intervals ( a third or less of the recommended commercial dose) reduced disease severity in tomato seedlings by over 90% after 4 weeks, and significantly slowed disease development under mist conditions. A. brasilense did not induce significant systemic resistance against the pathogen although the level of salicylic acid increased in inoculated plants. Treatment of tomato seeds that were artificially inoculated with P. syringae pv. tomato, with a combination of mild chemo-thermal treatment, A. brasilense seed inoculation, and later, a single foliar application of a copper bactericide, nearly eliminated bacterial leaf speck even when the plants were grown under mist for 6 weeks. This study shows that a combination of otherwise ineffective disease management tactics, when applied in concert, can reduce bacterial speck intensity in tomatoes under mist conditions. C1 Ctr Biol Res NW CIB, Pa Paz 23000, BCS, Mexico. Pontificia Univ Javeriana, Dept Biol, Bogota, Colombia. RP Bashan, Y, Ctr Biol Res NW CIB, POB 128, Pa Paz 23000, BCS, Mexico. 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J. Plant Pathol. PD NOV PY 2002 VL 108 IS 9 BP 821 EP 829 PG 9 SC Agronomy; Horticulture; Plant Sciences GA 619UX UT ISI:000179496800001 ER PT J AU Castanedo-Cazares, JP Lepe, V Moncada, B TI Pyogenic granuloma within port-wine stains SO EUROPEAN JOURNAL OF DERMATOLOGY LA English DT Letter C1 Univ Autonoma San Luis Potosi, Cent Hosp, Dept Dermatol, San Luis Potosi, Mexico. RP Castanedo-Cazares, JP, Univ Autonoma San Luis Potosi, Cent Hosp, Dept Dermatol, San Luis Potosi, Mexico. CR ABDELRAHEEM TA, 1994, DERMATOLOGY, V189, P283 BEERS BB, 1988, CUTIS, V41, P266 KIM TH, 1999, J DERMATOL, V26, P813 LEE JB, 2000, BRIT J DERMATOL, V143, P669 VALEYRIE L, 2002, EUR J DERMATOL, V12, P273 NR 5 TC 3 PU JOHN LIBBEY EUROTEXT LTD PI MONTROUGE PA 127 AVE DE LA REPUBLIQUE, 92120 MONTROUGE, FRANCE SN 1167-1122 J9 EUROPEAN J DERMATOLOGY JI Eur. J. Dermatol. PD NOV-DEC PY 2002 VL 12 IS 6 BP 616 EP 616 PG 1 SC Dermatology GA 622EK UT ISI:000179633400027 ER PT J AU Fisher, WS Malone, TC Giattina, JD TI A pilot project to detect and forecast harmful algal blooms in the northern Gulf of Mexico SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article DE harmful algal blooms; red tide; observing systems; remote sensing; in situ sensing; environmental monitoring ID TRANSPORT AB More timely access to data and information on the initiation, evolution and effects of harmful algal blooms can reduce adverse impacts on valued natural resources and human health. To achieve this in the northern Gulf of Mexico, a pilot project was initiated to develop a user-driven, end-to-end ( measurements to applications) observing system. A key strategy of the project is to coordinate existing state, federal and academic programs at an unprecedented level of collaboration and partnership. Resource managers charged with protection of public health and aquatic resources require immediate notice of algal events and a forecast of when, where and what adverse effects will likely occur. Further, managers require integrated analyses and interpretations, rather than raw data, to make effective decisions. Consequently, a functional observing system must collect and transform diverse measurements into usable forecasts. Data needed to support development of forecasts will include such properties as sea surface temperature, winds, currents and waves; precipitation and freshwater flows with related discharges of sediment and nutrients; salinity, dissolved oxygen, and chlorophyll concentrations ( in vivo fluorescence); and remotely-sensed spatial images of sea surface chlorophyll concentrations. These data will be provided via a mixture of discrete and autonomous in situ sensing with near real-time data telemetry, and remote sensing from space ( SeaWiFS), aircraft (hyperspectral imagery) or land (high-frequency radar). With calibration across these platforms, the project will ultimately provide a 4-dimensional visualization of harmful algae events in a time frame suitable to resource managers. C1 US EPA, Off Res & Dev, Natl Hlth & Environm Effects Res Lab, Gulf Ecol Div, Gulf Breeze, FL 32561 USA. Univ Maryland, Ctr Environm Studies, Horn Point Lab, Cambridge, MD 21613 USA. US EPA, Gulf Mexico Program Off, Stessis Space Ctr, Stennis Space Ctr, MS 39529 USA. RP Fisher, WS, US EPA, Off Res & Dev, Natl Hlth & Environm Effects Res Lab, Gulf Ecol Div, Gulf Breeze, FL 32561 USA. CR *CENR, 2000, NAT ASS HARMF ALG BL ANDERSON DM, 1989, RED TIDES BIOL ENV S, P11 CARLTON JT, 1993, SCIENCE, V261, P78 CULLICOTT CE, 1997, GEOTIMES, V42, P5 DAUGBJERG N, 2000, PHYCOLOGIA, V39, P302 FISHER WS, 1999, J SHELLFISH RES, V18, P318 GEESEY M, 1993, TOXIC PHYTOPLANKTON, P251 GILBES F, 1996, CONT SHELF RES, V16, P1201 GUNTER G, 1948, ECOL MONOGR, V18, P308 HALLEGRAEFF GM, 1992, J PLANKTON RES, V14, P1067 HALLEGRAEFF GM, 1993, PHYCOLOGIA, V32, P79 LANDSBERG JH, 1997, HARMFUL MICROALGAE SMAYDA TJ, 1989, NOVEL PHYTOPLANKTON, P213 SMAYDA TJ, 1990, TOXIC MARINE PHYTOPL, P29 STEIDINGER KA, 1981, BIOSCIENCE, V31, P814 STEIDINGER KA, 1984, DINOFLAGELLATES, P201 TESTER PA, 1991, LIMNOL OCEANOGR, V36, P1053 TESTER PA, 1997, LIMNOL OCEANOGR 2, V42, P1039 TESTER PA, 1998, HARMFUL ALGAE, P149 TESTER PA, 1998, J SHELLFISH RES, V17, P1469 VANDOLAH FM, 2000, ENVIRON HEALTH PE S1, V108, P133 NR 21 TC 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0167-6369 J9 ENVIRON MONIT ASSESS JI Environ. Monit. Assess. PD JAN-FEB PY 2003 VL 81 IS 1-3 BP 373 EP 381 PG 9 SC Environmental Sciences GA 620XY UT ISI:000179560300032 ER PT J AU Benammi, M Urrutia-Fucugauchi, J Alva-Valdivia, LM Chaimanee, Y Triamwichanon, S Jaeger, JJ TI Magnetostratigraphy of the Middle Miocene continental sedimentary sequences of the Mae Moh Basin in northern Thailand: evidence for counterclockwise block rotation SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article DE Thailand; magnetostratigraphy; biostratigraphy; Miocene; rotation ID PALEOMAGNETIC DATA; REVERSAL AB A magnetostratigraphic study has been performed on the Mae Moh basin, well known for its lignite mining in the Lampang province. Paleomagnetic samples were collected from 66 stratigraphic levels. Rock magnetic investigations indicate the presence of low coercivity minerals. Specimens subjected to progressive thermal (or alternating field) demagnetization procedures show that nearly all of them exhibit a low temperature magnetization component, and a high temperature characteristic component (ChRM), with either positive or negative virtual geomagnetic pole latitudes and opposite polarity, considered as the characteristic Miocene magnetization. The overall mean paleomagnetic direction (incl. = 22.2degrees, decl. = 358.3degrees, kappa= 15, alpha(95) = 4) documents a counterclockwise vertical axis rotation of about 13degrees +/- 1.32 with respect to the expected Miocene direction derived from the Eurasian polar wander curve (incl. = 42degrees, decl. = 11degrees). Our paleomagnetic results are not consistent with the previously reported paleomagnetic data. The rotation observed in the Mae Moh basin can be the response to local tectonics. A section sampled for magnetostratigraphy reveals a polarity sequence of nine magnetozones that can reliably be correlated to the geomagnetic polarity time scale. According to biochronological constraints, the magnetostratigraphic results from the mammal-bearing succession correlate with chron C5ABn-C5An2n, between 13.5 and 12.1 Ma. According to the mean sedimentation rate of about 17.5 cm/ka, ages of 12.5 and 12.8 Ma are proposed for the fossiliferous levels (J5 and Kl, K2 lignite zones) were the mammal remains were found. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Inst Geofis, Lab Paleomagnetismo & Geofis Nucl, Mexico City 04510, DF, Mexico. Univ Montpellier 2, Lab Geophys & Tecton, F-34095 Montpellier 5, France. Dept Mineral Resources, Geol Survey Div, Bangkok 10400, Thailand. Univ Montpellier 2, ISEM, Lab Paleontol, F-34095 Montpellier 5, France. RP Benammi, M, Univ Nacl Autonoma Mexico, Inst Geofis, Lab Paleomagnetismo & Geofis Nucl, Mexico City 04510, DF, Mexico. CR BARTON CE, 1980, GEOPHYS J ROY ASTRON, V61, P355 BENAMMI M, 2001, GEOL SOC AM BULL, V113, P265 BESSE J, 1991, J GEOPHYS RES-SOLID, V96, P4029 BIQUAND D, 1984, CAN J EARTH SCI, V21, P1325 CANDE SC, 1995, J GEOPHYS RES, V100, P6093 CHAODUMRONG P, 1983, WORKSH STRAT CORR TH, P159 CHONGLOKMANI C, 1983, WORKSH STRAT CORR TH, P105 CORSIRI R, 1985, UNPUB MAE MOH CAOL D DEMAREST HH, 1983, J GEOPHYS RES, V88, P4321 DEMENOCAL PB, 1990, EARTH PLANET SC LETT, V99, P1 DUCROCQ S, 1994, PALAEOGEOGR PALAEOCL, V108, P149 FISHER RA, 1953, P ROY SOC LOND A MAT, V217, P295 FULLER M, 1991, J SE ASIAN EARTH SCI, V6, P161 GINSBURG L, 1983, B SOC GEOL FRANCE, V25, P953 GINSBURG L, 1985, J GEOL SOC THAILAND, V8, P13 GINSBURG L, 1988, PALAEOENVIRONMENT E, P897 KIRSCHVINK JL, 1980, GEOPHYS J ROY ASTRON, V62, P699 KOENIGSWALD GHR, 1959, MASTODON OTHER FOSSI, P1 LEE TY, 1995, TECTONOPHYSICS, V251, P85 MCCABE RJ, 1988, J GEOPHYS RES, V93, P11899 MCFADDEN PL, 1990, GEOPHYS J INT, V103, P725 MORLEY CK, 2000, BASIN RES, V12, P1 MORLEY CK, 2001, TECTONOPHYSICS, V334, P115 POLACHAN S, 1989, INT S INT BAS GEOL R, P243 RATANASTHIEN B, 1997, P INT C STRAT TECT E, P596 SHERWOOD NR, 1984, INT J COAL GEOL, V4, P45 TAPPONNIER P, 1986, GEOL SOC LOND SPEC P, V19, P115 VEROSUB KL, 1977, REV GEOPHYS SPACE PH, V15, P129 NR 28 TC 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SCI LETT JI Earth Planet. Sci. Lett. PD DEC 15 PY 2002 VL 204 IS 3-4 BP 373 EP 383 PG 11 SC Geochemistry & Geophysics GA 621QB UT ISI:000179600000005 ER PT J AU Estrada, RF Alvarez-Gayosso, C Castano, VM TI Preparation of cellulose acetate films with controlled porosity SO E-POLYMERS LA English DT Article AB Porous polymeric films were obtained by immersing a solution of cellulose acetate and high molecular weight poly( acrylic acid) into an ice-water mixture. The films, the porosity of which can be controlled ( reversibly) by immersion into hot water for varying periods of time, were characterized by IR spectroscopy and low-vacuum scanning electron microscopy. C1 UNAM, Ctr Fis Aplicada & Tecnol Avanzada, Queretaro 76000, Mexico. Univ Nacl Autonoma Mexico, Fac Odontol, Mexico City 04510, DF, Mexico. Univ Iberoamer, Mexico City 01210, DF, Mexico. RP Castano, VM, UNAM, Ctr Fis Aplicada & Tecnol Avanzada, AP 1-1010, Queretaro 76000, Mexico. CR BRUNS A, 1971, OFFICE SALINE WATER BUYANOV AL, 1998, J APPL POLYM SCI, V69, P761 DONNAN FG, 1911, Z ELKTROCHEM ANGEW P, V17, P572 FROMMER MA, 2000, 20810, US KING WM, 1970, APPL POLYM S, V13, P17 LONSALDE HK, 1970, 577 OFF SAL WAT RES MILSTEAD CE, 1998, 92112, US ROZELLE LT, 1968, 359 OFF SAL WAT RES NR 8 TC 0 PU EUROPEAN POLYMER FEDERATION PI STRASBOURG PA 1, QUAI LEZAY-MARNESIA, F067000 STRASBOURG, FRANCE SN 1618-7229 J9 E-POLYMERS JI e-Polymers PD DEC 4 PY 2002 AR 054 DI ARTN 054 PG 6 SC Polymer Science GA 621YZ UT ISI:000179620100001 ER PT J AU Sar, EA Hernandez-Becerril, DU Sunesen, I TI A morphological study of Chaetoceros tenuissimus meunier, a little-known planktonic diatom, with a discussion of the Section Simplicia, subgenus Hyalochaete SO DIATOM RESEARCH LA English DT Article ID BACILLARIOPHYCEAE AB The morphology of Chaetoceros tenuissimus Meunier, a little-known species, has been studied for the first time with electron microscopy. C. tenuissimus has been placed as a synomyn of C. simplex Ostenfeld since approximately 1930, and has been misidentified or neglected in routine phytoplankton counts. The cells are very small and solitary, square to rectangular in girdle view. The setae are narrow and straight, arising from the two poles of the valve at an angle of 45degrees to its apical axis. The valve face possesses an annulus, delimited by a hyaline rim. Costae and small areolae radiate from the annulus. A single rimoportula occurs within the annulus. The rimoportula opens externally in a flatened tube and internally by a simple slit. The setae exhibit spirals of minute pores and an intricate pattern of spiral and perpendicular costae; spines are regularly present. Similarities with closely related species in Section Simplicia are discussed. C1 Natl Univ La Plata, Fac Ciencias Nat & Museo, Dept Cient Ficol, RA-1900 La Plata, Argentina. Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Mexico City 04510, DF, Mexico. RP Sar, EA, Natl Univ La Plata, Fac Ciencias Nat & Museo, Dept Cient Ficol, Paseo Bosque S-N, RA-1900 La Plata, Argentina. CR BERARDTHERRIAUL.L, 1999, PUBLICATION SPECIALE, V128, P1 BRUNEL J, 1966, NATURALIST CAN, V93, P849 BRUNEL J, 1972, J MAR BIOL ASSOC IND, V14, P315 CRAWFORD RM, 1994, DIATOM RES, V9, P27 EVENSEN DL, 1975, NOVA HEDWIGIA S, V53, P153 FERRARIO ME, 1995, MANUAL METODOS FICOL, P1 GRAN HH, 1897, NORSKE NORDHAVS EXPE, V24, P1 GUILLARD RRL, 1975, CULTURE MARINE INVER, P29 HASLE GR, 1997, IDENTIFYING MARINE P, P5 HERNANDEZBECERR.DU, 1996, B NATURAL HIST MUSEU, V26, P1 HUSTEDT F, 1930, KRYPTOGAMENFLORA, V7, P1 JENSEN KG, 1998, OPERA BOT, V133, P1 JOHANSEN JR, 1985, PHYCOLOGIA, V24, P437 JOHANSEN JR, 1990, J PHYCOL, V26, P271 JOHANSEN JR, 1995, CENTURY DIATOM RES N, P87 MANN DG, 1999, PHYCOLOGIA, V38, P437 MEDLIN LK, 2000, ORIGIN EARLY EVOLUTI, P13 MEUNIER A, 1913, MEM MUS ROY HIST NAT, V7, P1 OSTENFELD CH, 1901, VIDENSKABELIGE MEDDE, P129 OSTENFELD CH, 1903, BOT FAEROES, V2, P558 OSTENFELD CH, 1912, MEDDELELSER KOMMIS P, V1, P1 PAULSEN O, 1905, MEDD KOMM HAVUNDER P, V1, P1 PROSHKINALAVREN.AI, 1968, VODOROSLI PLANKTONA RINES JEB, 1988, BIBL PHYCOL, V79, P1 RINES JEB, 2000, PHYCOLOGICAL RES, V48, P161 RINES JWB, 1986, P 8 DIAT S 1984, P97 ROGERSON A, 1986, J PHYCOL, V22, P56 ROSS R, 1979, NOVA HEDWIGIA BEIH, V64, P513 RUSHFORTH SR, 1986, J PHYCOL, V22, P441 VANLANDINGHAM SL, 1968, CATALOGUE FOSSIL R 2, P494 NR 30 TC 1 PU BIOPRESS LIMITED PI BRISTOL PA THE ORCHARD, CLANAGE RD, BRISTOL BS3 2JX, ENGLAND SN 0269-249X J9 DIATOM RES JI Diatom Res. PD NOV PY 2002 VL 17 IS 2 BP 327 EP 335 PG 9 SC Marine & Freshwater Biology GA 620FC UT ISI:000179522500007 ER PT J AU Viberti, G Mogensen, C Ritz, E Halimi, S Ruilope, L Jermendy, G Widimsky, J Sareli, P Taton, J Erdogan, G Rull, J TI Treatment based on a very low dose combination of perindopril and indapamide reduces albuminuria more effectively than enalapril in hypertensive Type 2 diabetic patients: the PREMIER study SO DIABETOLOGIA LA English DT Meeting Abstract C1 Guys Hosp, Dept Endocrinol, London, England. Aarhus Kommune Hosp, Med Dept M, Aarhus, Denmark. Ludolf Krehl Klin, Fak Klin Med 1, Heidelberg, Germany. CHU Grenoble, Serv Endocrinol Diabetol & Maladies Nutr, F-38043 Grenoble, France. Hosp 12 Octubre, Consulta Nefrol, E-28041 Madrid, Spain. Bajcsy Zsilinsky Korhaz III Belosztaly, Budapest, Hungary. IKEM, Prague, Czech Republic. Univ Witwatersrand, Baragwanath Hosp, Dept Cardiol, Johannesburg, South Africa. Wewnetrznych Diabet AM, Katedra & Klin Chorob, Warsaw, Poland. Ankara Univ, Tip Fak, Endokrinol Bilim Dali, TR-06100 Ankara, Turkey. Inst Nacl Nutr, Delegac Tlalpan, Mexico City, DF, Mexico. NR 0 TC 1 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0012-186X J9 DIABETOLOGIA JI Diabetologia PD AUG PY 2002 VL 45 SU Suppl. 2 BP A65 EP A66 PG 2 SC Endocrinology & Metabolism GA 590HM UT ISI:000177813600191 ER PT J AU Williams, K Hanley, AJG Gonzalez-Villalpando, C D'Agostino, R Wagenknecht, LE Stern, MP Haffner, SM TI Prediction of Type 2 diabetes (DM) using simple measures of insulin resistance: combined results from the San Antonio Heart Study (SAHS), the Mexico City Diabetes Study (MCDS), and the Insulin Resistance Atherosclerosis Study (IRAS) SO DIABETOLOGIA LA English DT Meeting Abstract C1 Univ Texas, Hlth Sci Ctr, San Antonio, TX USA. Mt Sinai Hosp, Samuel Lunenfeld Res Inst, Toronto, ON, Canada. Amer British Cowdray Hosp, Ctr Studies Diabet, Mexico City, DF, Mexico. Wake Forest Univ, Sch Med, Winston Salem, NC USA. NR 0 TC 0 PU SPRINGER-VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0012-186X J9 DIABETOLOGIA JI Diabetologia PD AUG PY 2002 VL 45 SU Suppl. 2 BP A72 EP A72 PG 1 SC Endocrinology & Metabolism GA 590HM UT ISI:000177813600212 ER PT J AU Nigh, R TI On Maya medicine and the biomedical gaze - Reply SO CURRENT ANTHROPOLOGY LA English DT Editorial Material C1 Ctr Invest & Estudios Super Antropol Social, Chiapas, Mexico. RP Nigh, R, Ctr Invest & Estudios Super Antropol Social, San Cristobal Las Casas, Chiapas, Mexico. CR 1996, ACUERDOS SAN ANDRES BERLIN B, UNPUB MAYA ICBG PROJ ENCISO GF, 1993, MED TRADICIONALES ME FARNSWORTH NR, 1985, B WORLD HEALTH ORGAN, V63, P965 GONZALEZ R, 2000, ZAPOTEC SCI MARX K, 1967, CAPITAL CRITIQUE POL, V1 NAVARRO LH, 1998, COLECCION PROBLEMAS NIGH R, 1995, TERRITORIOS VIOLADOS NIGH R, 2002, CURR ANTHROPOL, V43, P451 STEPP JR, 2001, J ETHNOPHARMACOL, V75, P19 NR 10 TC 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0011-3204 J9 CURR ANTHROPOL JI Curr. Anthropol. PD DEC PY 2002 VL 43 IS 5 BP 792 EP 793 PG 2 SC Anthropology GA 619GD UT ISI:000179466700010 ER PT J AU Campos, J Eskilsson, K Nylander, T Svendsen, A TI On the interaction between adsorbed layers of monoolein and the lipase action on the formed layers SO COLLOIDS AND SURFACES B-BIOINTERFACES LA English DT Article DE Thermomyces (Humicula) lanuginosa lipase; monoolein; adsorption; lipase action; ellipsometry; surface forces ID AIR-WATER-INTERFACE; HYDROPHOBIC SURFACES; HUMICOLA-LANUGINOSA; PHASE-BEHAVIOR; SYSTEM; FILMS; ELLIPSOMETRY; ADSORPTION; ATTRACTION; FORCES AB We used the Surface Force Apparatus (SFA) and ellipsometry techniques to study the interaction forces and the adsorption behavior of monoolein (MO), respectively. MO was adsorbed from water to a hydrophobised mica or silica surface. In addition the effect of added lipase, Thermomyces (Humicula) lanuginosa lipase (TLL), to an adsorbed layer of MO was investigated. The force versus distance curves between two MO covered surfaces feature a strong repulsive interaction beneath 400 A. The range of the repulsive force decreases, however, with the number of approaches. No adhesion was observed, provided that the surfaces were not taken to hydrophobic contact. The surface separation at MO-MO contact was determined to about 55 Angstrom This means a layer thickness of about 27 Angstrom, which is comparable to the thickness (25 Angstrom) determined by ellipsometry. The repulsive force may arise from compression of a cubic phase of MO. This phase are suggested to form between the surfaces when they approach close contact due to capillary induced phase separation (CIPS) from the saturated MO solution. The repulsive force changes significantly with time after addition of TLL (concentration of about 1 x 10(-8) M). In contrast to the force curves recorded before adding TLL, the surfaces do not seem to be completely covered with MO as we always observed an attractive force (inward jump) of similar range as was observed between pure OTE surfaces. Ellipsometry measurement of TLL action on MO covered hydrophobic surface reveals a significant and sharp decrease of the amounts adsorbed. Furthermore, the rate of decrease and reduction in adsorbed amount increased with TLL concentration. (C) 2002 Elsevier Science B.V. All rights. reserved. C1 Lund Univ, Ctr Chem & Chem Engn, SE-22100 Lund, Sweden. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Inst Surface Chem, SE-11486 Stockholm, Sweden. Novozymes AS, DK-2880 Bagsvaerd, Denmark. CR BORNE J, 2001, LANGMUIR, V17, P7742 BRIGGS J, 1996, J PHYS II, V6, P723 BRZOZOWSKI AM, 2000, BIOCHEMISTRY-US, V39, P15071 CABOI F, 2002, COLLOID SURFACE B, V26, P159 CAJAL Y, 2000, BIOCHEMISTRY-US, V39, P413 CAJAL Y, 2000, BIOCHIMIE, V82, P1053 CARAMBASSIS A, 1998, PHYS REV LETT, V80, P5357 CHRISTENSON HK, 1988, SCIENCE, V239, P390 CHRISTENSON HK, 1989, PHYS REV B, V39, P11750 CHRISTENSON HK, 1997, COLLOID SURF A, V129, P67 DEFEIJTER JA, 1978, BIOPOLYMERS, V17, P1759 ESKILSSON K, 1997, MACROMOLECULES, V30, P6323 EVANS DF, 1999, COLLOIDAL DOMAIN WHE HYDE ST, 1984, Z KRISTALLOGR, V168, P213 ISHIDA N, 2000, LANGMUIR, V16, P5681 ISHIDA N, 2000, LANGMUIR, V16, P6377 ISRAELACHVILI JN, 1978, J CHEM SOC FARAD T 1, V74, P975 JENSEN TR, 1999, P C LIP LIP STRUCT F, P127 KERN W, 1983, RCA ENG, V28, P99 LANDH T, 1994, J PHYS CHEM-US, V98, P8453 LARSSON K, 1983, NATURE, V304, P664 LINDBLOM G, 1979, J AM CHEM SOC, V101, P5465 PANAIOTOV I, 2000, PHYSICAL CHEM BIOL I, P359 PARKER JL, 1989, REV SCI INSTRUM, V60, P3135 PARKER JL, 1994, J PHYS CHEM-US, V98, P8468 PATINO JMR, 1994, J COLLOID INTERF SCI, V167, P150 PATINO JMR, 1999, LANGMUIR, V15, P2484 PETERS GH, 2000, LANGMUIR, V16, P2779 PETROV P, 1997, LANGMUIR, V13, P3331 PEZRON I, 1991, J COLLOID INTERF SCI, V144, P449 PITZALIS P, 2000, LANGMUIR, V16, P6358 QUI H, 2000, BIOMATERIALS, V21, P223 SANCHEZ CC, 1998, COLLOID SURFACE A, V143, P477 SANCHEZ CC, 1999, COLLOID SURFACE B, V12, P175 SVENDSEN A, 2000, BBA-PROTEIN STRUCT M, V1543, P223 TIBERG F, 1993, LANGMUIR, V9, P927 TIBERG F, 1994, LANGMUIR, V10, P3714 TYRELL JWG, 2001, PHYS REV LETT, V87 VERGER R, 1997, TRENDS BIOTECHNOL, V15, P32 WANNERBERGER K, 1996, J COLLOID INTERF SCI, V177, P316 WANNERBERGER K, 1997, LANGMUIR, V13, P784 WENNERSTROM H, 1998, LANGMUIR, V14, P5664 WOOD J, 1994, LANGMUIR, V10, P2307 WOOD J, 1995, LANGMUIR, V11, P4797 XICOHTENCATLCOR.J, 2002, UNPUB LANGMUIR NR 45 TC 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7765 J9 COLLOID SURFACE B JI Colloid Surf. B-Biointerfaces PD SEP PY 2002 VL 26 IS 1-2 BP 172 EP 182 PG 11 SC Biochemistry & Molecular Biology; Biophysics GA 619QG UT ISI:000179487200017 ER PT J AU Proverbio, ZE Schulz, PC Puig, JE TI Aggregation of the aqueous dodecyl-trimethylammonium bromide-didodecyldimethylammonium bromide system at low concentration SO COLLOID AND POLYMER SCIENCE LA English DT Article DE mixed surfactants; vesicles; packing parameter; cationic surfactants ID BINARY SURFACTANT MIXTURES; CRITICAL MICELLE CONCENTRATIONS; MIXED MICELLES; DIALKYLDIMETHYLAMMONIUM BROMIDE; SPONTANEOUS VESICLES; CATIONIC VESICLES; PHASE-BEHAVIOR; DRUG-DELIVERY; SOLUBILIZATION; WATER AB The dodecyltrimethylammonium bromide (DTAB)-didodecyldimethylammonium bromide (DDAB)-water system was studied to elucidate whether the mixed surfactant aggregates are mainly micelles or vesicles, and whether the surfactant-surfactant interaction is ideal or not. The regular solution theory of mixed micelles and the Israelachvili-Mitchell-Ninham (IMN) packing parameter of the aggregated mixture were used. The interaction between dissimilar surfactant species was found to be non-ideal, with a positive value of the regular solution theory interaction parameter. The steric hindrance interaction parameter of Huang and Somasundaran theory indicated that the introduction of DTAB into DDAB layers was favoured at very low DTAB content, but became highly unfavourable when the proportion of DTAB increased. The aggregates were systematically much richer in DDAB than the solution of interaggregates. The IMN values systematically were compatible with flat surfaces, i.e., lamellar liquid crystals and vesicles. The results may be explained by a different composition of the inner and outer monolayers in the bilayer structure of the vesicles. C1 Univ Nacl Sur, Dept Quim, RA-8000 Bahia Blanca, Buenos Aires, Argentina. Univ Guadalajara, Ctr Ciencias & Ingenierias, Dept Ingn Quim, Guadalajara 44430, Jalisco, Mexico. RP Schulz, PC, Univ Nacl Sur, Dept Quim, RA-8000 Bahia Blanca, Buenos Aires, Argentina. 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Sci. PD NOV PY 2002 VL 280 IS 11 BP 1045 EP 1052 PG 8 SC Chemistry, Physical; Polymer Science GA 620ZA UT ISI:000179563000010 ER PT S AU Verdugo-Diaz, L Olivares-Banuelos, T Navarro, L Drucker-Colin, R TI Effects of extremely low frequency electromagnetic field stimulation on cultured chromaffin cells SO CHROMAFFIN CELL: TRNSMITTER BIOSYNTHESIS, STORAGE, RELEASE, ACTIONS, AND INFORMATICS SE ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article DE neurite-like; differentiation; NGF; catecholamine release; calcium channel; gene expression ID NERVE GROWTH-FACTOR; NEURITE GROWTH C1 Natl Autonomous Univ Mexico, Inst Fisiol Celular, Dept Neurociencias, Mexico City 04510, DF, Mexico. Natl Autonomous Univ Mexico, Fac Med, Dept Fisiol, Mexico City 04510, DF, Mexico. RP Drucker-Colin, R, Natl Autonomous Univ Mexico, Inst Fisiol Celular, Dept Neurociencias, Mexico City 04510, DF, Mexico. CR DRUCKERCOLIN R, 1994, MOL CELL NEUROSCI, V5, P485 FERIAVELASCO A, 1998, J NEUROSCI RES, V53, P569 KATER SB, 1991, J NEUROSCI, V11, P891 MORGADOVALLE C, 1998, CELL TISSUE RES, V291, P217 POOL R, 1990, SCIENCE, V249, P1378 SHENG M, 1990, NEURON, V4, P447 UNSICKER K, 1978, P NATL ACAD SCI USA, V81, P2242 VERDUGODIAZ L, 1998, BIOELECTROCH BIOENER, V46, P287 NR 8 TC 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 EAST 63RD ST, NEW YORK, NY 10021 USA SN 0077-8923 J9 ANN N Y ACAD SCI JI Ann.NY Acad.Sci. PY 2002 VL 971 BP 266 EP 268 PG 3 GA BV61K UT ISI:000179509100049 ER PT J AU Enam, S Del Valle, L Lara, C Gan, DD Ortiz-Hidalgo, C Palazzo, JP Khalili, K TI Association of human polyomavirus JCV with colon cancer: Evidence for interaction of viral T-antigen and beta-catenin SO CANCER RESEARCH LA English DT Article ID PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY; VIRUS-DNA SEQUENCES; GASTROINTESTINAL-TRACT; HUMAN-POPULATIONS; CELLS; TRANSMISSION; PROTEIN; EXPRESSION; REGION AB Infection of the gastrointestinal tract by the human polyomavirus, JCV, which has been frequently detected in raw urban sewage, can occur via intake of contaminated water and food. In light of earlier reports on the tumorigenecity of JCV, we investigated the presence of the JCV genome and the expression of viral proteins in a collection of 27 well-characterized epithelial malignant tumors of the large intestine. Results from gene amplification revealed the presence of the viral early genome in 22 of 27 samples. Expression of the viral oncogenic early protein, T-antigen, and the late auxiliary protein, Agnoprotein, was observed in >50% of the samples. The absence of the viral capsid protein in the tumor cells excludes productive replication of the virus in neoplastic cells. Laser capture microdissection confirmed the presence of the JCV genome and expression of T-antigen in precancerous villous adenomas and regions of invasive adenocarcinoma. The ability of JCV T-antigen to interact with beta-catenin and the nuclear detection of beta-catenin in T-antigen-positive cells suggests dysregulation of the Wnt pathway in the tumor cells. The coproduction of T-antigen and beta-catenin in colon cancer cells enhanced transcription of the c-myc promoter, the downstream target of beta-catenin. These observations provide evidence for a possible association of JCV with colon cancer and suggest a novel regulatory role for T-antigen in the deregulation of the Wnt signaling pathway through beta-catenin in tumors of the gastrointestinal tract. C1 Temple Univ, Coll Sci & Technol, Ctr Neurovirol & Canc Biol, Philadelphia, PA 19122 USA. Amer British Cowdray Med Ctr IAP, Dept Patol, Mexico City 01120, DF, Mexico. Thomas Jefferson Univ Hosp, Dept Pathol, Philadelphia, PA 19107 USA. RP Khalili, K, Temple Univ, Coll Sci & Technol, Ctr Neurovirol & Canc Biol, 1900 N 12th St,015-96,Room 203, Philadelphia, PA 19122 USA. CR AGOSTINI HT, 1997, P NATL ACAD SCI USA, V94, P14542 ALEXANDER N, 2002, AM J PATHOL, V160, P389 AUSUBEL F, 1996, CURRENT PROTOCOLS MO BERGER JR, 1995, J NEUROVIROL, V1, P15 BOFILLMAS S, 2000, APPL ENVIRON MICROB, V66, P238 BOFILLMAS S, 2001, J NEUROVIROL, V7, P345 BOFILLMAS S, 2001, J VIROL, V75, P10290 DELVALLE L, 2001, CANCER RES, V61, P4287 DELVALLE L, 2001, HUMAN POLYOMAVIRUSES, P409 DELVALLE L, 2002, J NATL CANCER I, V94, P267 DOBBIE Z, 2002, ANTICANCER RES, V22, P2215 DORRIES K, 1983, J MED VIROL, V11, P307 DYSON N, 1990, J VIROL, V64, P1353 FEARON ER, 1990, CELL, V61, P759 FRISQUE RJ, 1980, J VIROL, V35, P265 FRISQUE RJ, 1984, J VIROL, V51, P458 GAN DD, 2001, ONCOGENE, V20, P4864 HAMILTON SR, 2001, WHO CLASSIFICATION T HOWLEY PM, 1980, J VIROL, V36, P878 KITAMURA T, 1994, J CLIN MICROBIOL, V32, P2359 KRYNSKA B, 1999, ONCOGENE, V18, P39 KRYNSKA B, 1999, P NATL ACAD SCI USA, V96, P11519 LAGHI L, 1999, P NATL ACAD SCI USA, V96, P7484 LASSAK A, 2002, J BIOL CHEM, V277, P17231 MONACO MCG, 1996, J VIROL, V70, P7004 MORIN PJ, 1999, BIOESSAYS, V21, P1021 PEIFER M, 1997, SCIENCE, V275, P1752 RICCIARDIELLO L, 2000, GASTROENTEROLOGY, V119, P1228 RICCIARDIELLO L, 2001, J VIROL, V75, P1996 SOLOMON E, 1987, NATURE, V328, P616 TOMATORE C, 1992, ANN NEUROL, V31, P454 VACANTE DA, 1989, VIROLOGY, V170, P353 WEBER T, 1997, INTERVIROLOGY, V40, P98 NR 33 TC 27 PU AMER ASSOC CANCER RESEARCH PI BIRMINGHAM PA PO BOX 11806, BIRMINGHAM, AL 35202 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD DEC 1 PY 2002 VL 62 IS 23 BP 7093 EP 7101 PG 9 SC Oncology GA 622HJ UT ISI:000179641000046 ER PT J AU Frey, E Buchy, MC Stinnesbeck, W Lopez-Oliva, JG TI Geosaurus vignaudi n.sp (Crocodyliformes : Thalattosuchia), first evidence of metriorhynchid crocodilians in the Late Jurassic (Tithonian) of central-east Mexico (State of Puebla) SO CANADIAN JOURNAL OF EARTH SCIENCES LA English DT Article AB Thalattosuchian crocodilians of the genus Geosaurus have mostly been recorded from the Jurassic of Europe. A single species was reported from Argentina. Here we describe a new species of Geosaurus vignaudi from the middle Tithonian La Pimienta Formation of State of Puebla, Mexico. Diagnostic for this species are the extremely low tooth count and a rostroventrally directed process at the rostral terminus of the mandible combined with a pair of horizontally directed rostral teeth. The skull of the holotype shows bite marks that probably caused the death of the animal. C1 Staatl Museum Naturkunde, D-76133 Karlsruhe, Germany. Univ Karlsruhe, Inst Geol, D-76128 Karlsruhe, Germany. Univ Autonoma Nuevo Leon, Fac Ciencias Tierra, Linares, Mexico. RP Frey, E, Staatl Museum Naturkunde, Erbprinzenstr 13, D-76133 Karlsruhe, Germany. CR ADATTE T, 1996, MITT GEOL PALAONT I, V77, P379 BENTON MJ, 1988, PHYLOGENY CLASSIFICA, V1, P295 BUFFETAUT E, 1982, MEMOIRES SOC GEOLOGI, V60, P1 CANTOR N, 1989, ADV SOCIAL COGNITION, V2, P1 CANTUCHAPA A, 1967, I MEXICANO PETROLEO, V1, P3 CUVIER G, 1824, RECHERCHES OSSEMENS, V5, P143 DEGASPARINI ZB, 1976, ACT 1 C GEOL CHIL SA, P1 EUDESDESLONGCHA.JA, 1866, B SOC LINNEENNE NORM, V10, P193 FITZINGER L, 1843, SYSTEMA REPTILIUM, P1 FRAAS E, 1901, JAHRESHEFTE VEREINS, V57, P409 FRAAS E, 1902, PALAEONTOGRAPHICA, V49, P1 FREY E, 1988, STUTTGARTER BEITRA A, V424, P1 GASPARINI Z, 1992, WORLD REGIONAL GEOLO, V3, P361 GASPARINI Z, 2000, B SOC GEOL FR, V171, P657 HERKNER B, 1999, CAROLINEA BEIH, V13, P1 ROSSMANN T, 1996, THESIS J GUTENBERG U SALISBURY SW, 2001, THESIS U NEW S WALES SMITH AG, 1994, ATLAS MESOZOIC CENOZ, P1 SOEMMERING ST, 1816, DENKSCHRIFT KONIG MP, V6, P37 STINNESBECK W, 1993, REV ESP MICROPALEONT, V25, P63 VIGNAUD P, 1995, THESIS U POITIERS FR VIGNAUD P, 1996, CR ACAD SCI II A, V322, P245 VONMEYER H, 1830, MINERALOGISCHE ABTEI, V15, P517 NR 23 TC 3 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA SN 0008-4077 J9 CAN J EARTH SCI JI Can. J. Earth Sci. PD OCT PY 2002 VL 39 IS 10 BP 1467 EP 1483 PG 17 SC Geosciences, Multidisciplinary GA 619YE UT ISI:000179504600003 ER PT J AU Saxe-Fernandez, J TI Globalization and security: The imperial presidency in Mexico SO CANADIAN JOURNAL OF DEVELOPMENT STUDIES-REVUE CANADIENNE D ETUDES DU DEVELOPPEMENT LA English DT Article AB This paper focuses on the projection of the imperial power of the United States in Mexico. As the author sees and constructs it, this is a historical problem, with a clear pattern that emerges in a review of developments from the early 19th century to the most recent turn of US imperialism in the wake of September 11. At issue in these developments is the need for, and efforts of, the US government (the "imperial presidency") to reconcile conflicting imperatives of economic power, projected by US-based multinational corporations, and the political imperative to foster stability and order. The author analyzes the implications for Mexico of the efforts of the US imperial presidency to resolve this problem. C1 Natl Autonomous Univ Mexico, Ctr Interdisciplinary Res Sci & Humanities, El Mundo Actual Res Program, Mexico City, DF, Mexico. RP Saxe-Fernandez, J, Natl Autonomous Univ Mexico, Ctr Interdisciplinary Res Sci & Humanities, El Mundo Actual Res Program, Mexico City, DF, Mexico. CR *MARC SUBC, 1994, CHIAP SUR VIENT TORM BAILEY TA, 1980, DIPLOMATIC HIST AM P CALVA JL, 1993, DISPUTA TIERRA CHANDLER A, 1995, VISIBLE HAND DOMVI DOMVILLE L, 1994, FINANCIERO 0428 GURR TR, 1970, WHY MEN REBEL KOLKO G, 1972, LIMITS POWER LAFEBER W, 1995, AM AGE LAFEBER W, 1995, AM SEARCH OPPORTUNIT MAGDOFF H, 1992, GLOBALIZATION FOR WH MESZAROS I, 1995, BEYOND CAPITAL MONTEMAYOR C, 1998, GUERRA PARAISO NAVARRETE R, 2002, NEWS 0730 SAXEFERNANDEZ J, 1994, INT J POLITICS CULTU, V8 SAXEFERNANDEZ J, 2002, POLITICA EC DESARROL SCHLESINGER A, 1973, IMPERIAL PRESIDENCY SWEEZY P, 1997, MON REV, V49, P4 ZINN H, 1990, PEOPLES HIST US NR 18 TC 0 PU UNIV OTTAWA PI OTTAWA PA 542 KING EDWARD AVE, OTTAWA, ONTARIO K1N 6N5, CANADA SN 0225-5189 J9 CAN J DEV STUD JI Can. J. Dev. Stud. PY 2002 VL 23 IS 3 BP 475 EP 491 PG 17 SC Planning And Development GA 619XB UT ISI:000179501800006 ER PT J AU Lorea-Hernandez, FG Van Der Werff, H TI Three new species of Ocotea (Lauraceae) from southern Mexico SO BRITTONIA LA English DT Article DE Mexico; Lauraceae; Ocotea AB Lorea-Hernandez, E G. (Instituto de Ecologia, A. C., Apartado Postal 63, Xalapa, Veracruz, 91000, Mexico; loreaf@ecologia.edu.mx) and H. van der Werff (Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri, 63166-0299, U.S.A.; Henk.Vanderwerff@mobot.org). Three new species of Ocotea (Lauraceae) from southern Mexico. Brittonia 54: 145-153. 2002.-Three new species of Ocotea (O. disjuncta, O. iridescens, and O. rovirosae) from southern Mexico are described and illustrated. Ocotea disjuncta is related to the O. effusa group, while O. iridescens seems to be related to the O. heydeana group. The relationships of O. rovirosae are not clear. C1 Inst Ecol, Xalapa 91000, Veracruz, Mexico. Missouri Bot Garden, St Louis, MO 63166 USA. RP Lorea-Hernandez, FG, Inst Ecol, AC,Apartado Postal 63, Xalapa 91000, Veracruz, Mexico. CR ROHWER JG, 1986, MITT I ALLG BOT HAMB, V20, P1 ROHWER JG, 1991, BOT JB SYST, V112, P365 ROHWER JG, 1993, FAMILIES GENERA VASC, V2, P366 ROHWER JG, 1993, FAMILIES GENERA VASC, V2, P366 RZEDOWSKI J, 1993, BIOL DIVERSITY MEXIC, P129 RZEDOWSKI J, 1993, BIOL DIVERSITY MEXIC, P129 VANDERWERFF H, 1991, ANN MISSOURI BOT GAR, V75, P153 VANDERWERFF H, 1991, ANN MISSOURI BOT GAR, V75, P153 VANDERWERFF H, 1999, NOVON, V9, P571 NR 9 TC 0 PU NEW YORK BOTANICAL GARDEN PI BRONX PA PUBLICATIONS DEPT, BRONX, NY 10458 USA SN 0007-196X J9 BRITTONIA JI Brittonia PD JUL-SEP PY 2002 VL 54 IS 3 BP 145 EP 153 PG 9 SC Plant Sciences GA 621NF UT ISI:000179595500001 ER PT J AU Villarreal-Q, JA De la Rosa-I, M TI A new variety of Tagetes moorei (Asteraceae), a poorly known species from central Mexico SO BRITTONIA LA English DT Article DE Asteraceae; Tageteae; Tagetes; Mexico AB Tagetes moorei var. brevifigulata is proposed as new. It differs from the typical population in habit, number of flowers, and size of the ray flowers. It is known from eastern Queretaro state, Mexico. Descriptions, an illustration, a key, and a tabular comparison are provided. C1 Univ Autonoma Agraria Antonio Narro, Dept Bot, Saltillo 25315, Coahuila, Mexico. RP Villarreal-Q, JA, Univ Autonoma Agraria Antonio Narro, Dept Bot, Saltillo 25315, Coahuila, Mexico. CR MCVAUGH R, 1984, FLORA NOVO GALICIANA, V12, P910 ROBINSON H, 1973, PHYTOLOGIA, V26, P378 RYDBERG P, 1915, N AM FL, V34, P148 SOULE J, 1993, THESIS U TEXAS AUSTI STROTHER JL, 1977, BIOL CHEM COMPOSITAE, V2, P769 TURNER BL, 1996, PHYTOLOGIA MEMOIRS, V10, P51 NR 6 TC 0 PU NEW YORK BOTANICAL GARDEN PI BRONX PA PUBLICATIONS DEPT, BRONX, NY 10458 USA SN 0007-196X J9 BRITTONIA JI Brittonia PD JUL-SEP PY 2002 VL 54 IS 3 BP 164 EP 167 PG 4 SC Plant Sciences GA 621NF UT ISI:000179595500003 ER PT J AU Harker, M Jimenez-Reyes, N TI Verbesina barrancae (Compositae, Heliantheae), a new species from Jalisco, Mexico SO BRITTONIA LA English DT Article DE Compositae; Asteraceae; Heliantheae; Verbesina; Mexico; palynology AB Verbesina barrancae, a new species of Compositae (Heliantheae) from Jalisco, Mexico, is described and illustrated. It is morphologically similar to Verbesina crocata but differs in characteristics of inflorescence, anthers, and achenes as well as in form of pollen, size and number of spinules, size of colpus transversalis, and index of polar area. C1 Univ Guadalajara, Inst Bot, Herbario, Zapopan 45101, Jalisco, Mexico. Univ Guadalajara, Inst Bot, Lab Palinol, Zapopan 45101, Jalisco, Mexico. RP Harker, M, Univ Guadalajara, Inst Bot, Herbario, Apartado Postal 1-139, Zapopan 45101, Jalisco, Mexico. CR BREMER K, 1994, ASTERACEAE CLADISTIC DECANDOLLE AP, 1836, PRODROMUS SYSTEMATIS ERDTMAN G, 1943, INTRO POLLEN ANAL ERDTMAN G, 1972, INTRO POLLEN ANAL ERDTMAN G, 1972, POLLEN MORPHOLOGY PL FAEGRI K, 1975, TXB POLLEN ANAL GONCALVESESTEVE.V, 1986, B MUS NAC RIO DE JAN, V74, P1 GONCALVESESTEVE.V, 1986, B MUS NAC RIO DE JAN, V74, P1 GONCALVESESTEVE.V, 1988, B MUS NAC RIO DE JAN, V77, P1 GONCALVESESTEVE.V, 1988, B MUS NAC RIO DE JAN, V77, P1 GONCALVESESTEVE.V, 1989, B MUS NAC RIO DE JAN, V80, P1 GONCALVESESTEVE.V, 1989, B MUS NAC RIO DE JAN, V80, P1 GONCALVESESTEVE.V, 1989, B MUS NAC RIO DE JAN, V82, P1 GONCALVESESTEVE.V, 1989, B MUS NAC RIO DE JAN, V82, P1 GONZALEZ QL, 1969, PALEOECOLOGIA GONZALEZ QL, 1969, PALEOECOLOGIA, V3 KREMP GOW, 1965, MORPHOLOGIC ENCY PAL MARKGRAF V, 1978, POLLEN FLORA ARGENTI MCVAUGH R, 1972, CONTR U MICHIGAN HER, V9, P205 MCVAUGH R, 1984, COMPOSITAE, V12, P963 NASH DL, 1976, BOTANY, V24, P1 OLSEN J, 1988, SIDA, V13, P45 ROBINSON BL, 1899, P AM ACAD ARTS SCI, V34, P534 ROUBIK D, 1991, POLLEN SPORES BARRO STROTHER JL, 1999, FLORA CHIAPAS, P131 STROTHER JL, 1999, FLORA CHIAPAS, P131 TURNER BL, 1988, SIDA, V13, P39 TURNER BL, 1998, DIVERSIDAD BIOL MEXI, P545 TURNER BL, 1998, DIVERSIDAD BIOL MEXI, P545 NR 29 TC 0 PU NEW YORK BOTANICAL GARDEN PI BRONX PA PUBLICATIONS DEPT, BRONX, NY 10458 USA SN 0007-196X J9 BRITTONIA JI Brittonia PD JUL-SEP PY 2002 VL 54 IS 3 BP 181 EP 189 PG 9 SC Plant Sciences GA 621NF UT ISI:000179595500007 ER PT J AU Marina, N Morales, T Diaz, N Mena, F TI Suckling-induced activation of neural c-fos expression at lower thoracic rat spinal cord segments SO BRAIN RESEARCH LA English DT Review DE lactation; Fos; suckling; spinal cord; sympathetic ID MILK-EJECTION REFLEX; SYMPATHETIC NERVOUS-SYSTEM; PSEUDORABIES VIRUS; LACTATING RATS; MAMMARY-GLANDS; DORSAL HORN; SUBSTANCE-P; VAGINOCERVICAL STIMULATION; TRANSGANGLIONIC TRANSPORT; SUPRACHIASMATIC NUCLEUS AB Suckling stimulation is essential for neuroendocrine and sympathetic reflex activation during lactation. In the present study, the induction of c-fos gene expression was used to identify neuronal populations in the spinal cord activated by acute 5 min suckling or by electrical stimulation of the central stump of the first abdominal mammary nerve in lactating rats previously separated from their litters for 6 or 18 h. In addition, to investigate whether spinal sympathetic preganglionic neurons are activated by suckling, dual immunostaining (Fos and choline acetyltransferase) was performed. Fos was expressed at low levels in continuously suckled and 6 h nonsuckled mothers, but no expression was found after 18 It of nonsuckling. On the other hand, in 6 h nonsuckled rats, significant increments in Fos expression occurred in several regions after acute suckling and after electrical stimulation. Also, the pattern of Fos expression in each spinal laminae was different for the two stimuli, i.e. more intense effects of suckling in deep laminae V-X and more intense effects in laminae I-IV with electrical stimulation. Double-labeling after suckling was found only in sympathetic preganglionic neurons from the intermedio-medial cell column, whereas after electrical stimulation, double label was observed only in neurons from the intennedio-lateral cell column. On the other hand, no effect upon Fos protein expression was observed after suckling and only a minor effect after electrical stimulation of mammary nerve in 18 h nonsuckled rats. These results are consistent with previous findings on the sympathetic reflex regulation of the mammary gland, as well as on the importance of the nonsuckling interval for optimal functioning of lactation. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Natl Autonomous Univ Mexico, UNAM, Dept Cellular & Mol Neurobiol, Inst Neurobiol, Juriquilla 76001, Queretaro, Mexico. RP Mena, F, Natl Autonomous Univ Mexico, UNAM, Dept Cellular & Mol Neurobiol, Inst Neurobiol, Juriquilla 76001, Queretaro, Mexico. 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PD NOV 1 PY 2002 VL 954 IS 1 BP 100 EP 114 PG 15 SC Neurosciences GA 620FN UT ISI:000179523500014 ER PT J AU Flores, G Flores, J Mena, R Valencia, J TI Mutant Taiep rats exhibit an increase in D1 binding in basal ganglia SO BRAIN RESEARCH LA English DT Article DE Taiep rat; caudate-putamen; external segment of the globus pallidus; substantia nigra pars compacta; dopamine receptor; myelin defect ID DOPAMINE-RECEPTORS; SUBSTANTIA-NIGRA; IMMOBILITY EPISODES; NEUROLOGICAL MUTANT; MOLECULAR-BIOLOGY; MYELIN MUTANT; EPILEPSY; OLIGODENDROCYTES; EXPRESSION; GLUTAMATE AB Previous reports have shown that the Taiep rat develop a progressive neurological syndrome characterized by tremor, ataxia, immobility episodes, audiogenic seizures and hind limb paralysis. Here we have investigated whether differences in levels of dopamine D1-like and D2-like receptors could be correlated with the progression of this neurological syndrome. Comparative autoradiographic study of Taiep and Sprague-Dawley (SD) rats at level of basal ganglia and limbic subregion were undertaken in 3- and 9-month-old rats. The Taiep rats exhibited a higher level of D1 receptors in the basal ganglia subregions compared to SD. However, there were no differences in the level of D1 receptors in the limbic subregions between these two strains. As compared to the SD rats, the Taiep rats did not appear to change levels of D2-like receptors. These data suggest that the differences in D1 receptors in these two strains rats may in part contribute to develop the dopamine related symptoms seen in the mutant rat, such as tremor, which is the earliest sign of the Taiep rat syndrome. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Autonoma Puebla, Inst Fisiol, Lab Neuropsiquiatria, Puebla 72570, Mexico. Univ Autonoma Puebla, Inst Fisiol, Lab Fisiol Conducta, Puebla, Mexico. IPN, Ctr Invest & Estud Avanzados, Dept Fisiol Biofis & Neurociencias, Mexico City, DF, Mexico. RP Flores, G, Univ Autonoma Puebla, Inst Fisiol, Lab Neuropsiquiatria, 14 Sur 6301, Puebla 72570, Mexico. 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PD NOV 22 PY 2002 VL 956 IS 1 BP 24 EP 29 PG 6 SC Neurosciences GA 620DB UT ISI:000179517200003 ER PT J AU Garcia-Arellano, H Valderrama, B Saab-Rincon, G Vazquez-Duhalt, R TI High temperature biocatalysis by chemically modified cytochrome c SO BIOCONJUGATE CHEMISTRY LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; MISCIBLE ORGANIC-SOLVENTS; POLYETHYLENE-GLYCOL; DIRECTED EVOLUTION; THERMAL-STABILITY; YEAST ISO-1-CYTOCHROME-C; GUANIDINE-HYDROCHLORIDE; SOLUBLE POLYSACCHARIDES; CIRCULAR-DICHROISM; HYDROGEN-PEROXIDE AB Chemically modified cytochrome c with poly(ethylene glycol) (PEG) showed activity at temperatures higher than 100 degreesC and to be highly thermostable. The molecular size of PEG moieties and the coupling site affected the thermal stabilization. An optimal PEG/protein mass ratio of 2.8 was found, producing a fully thermostable biocatalyst at 80 degreesC. Site-directed mutagenesis on yeast cytochrome c showed an increased thermostabilization when lysine 79 residue, localized at the edge of the active site, was replaced by a nonreactive residue. Tertiary, secondary, and active-site structures were analyzed by fluorescence, CD, and UV/visible spectroscopies. Besides its disordered structure, the pegylated protein showed a lower unfolding rate at the active-site than the unmodified ones. A shell-like structure seems to protect the heme environment, in which PEG is coiled on the protein surface with a primary shield of rigid water molecules solvating the hydrophilic region of bound-PEG, and the PEG hydrophobic regions interacting with the hydrophobic clusters on protein surface. C1 UNAM, Inst Biotechnol, Cuernavaca 62250, Morelos, Mexico. RP Vazquez-Duhalt, R, UNAM, Inst Biotechnol, Apartado Postal 510-3, Cuernavaca 62250, Morelos, Mexico. 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PD NOV-DEC PY 2002 VL 13 IS 6 BP 1336 EP 1344 PG 9 SC Chemistry, Multidisciplinary; Chemistry, Organic; Biochemical Research Methods; Biochemistry & Molecular Biology GA 620DF UT ISI:000179517700023 ER PT J AU Flores-Herrera, O Uribe, A Garcia-Perez, C Milan, R Martinez, F TI 5 '-p-fluorosulfonylbenzoyl adenosine inhibits progesterone synthesis in human placental mitochondria SO BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR AND CELL BIOLOGY OF LIPIDS LA English DT Article DE progesterone synthesis; placental mitochondrion; apyrase; FSBA ID ACUTE REGULATORY PROTEIN; HUMAN TERM PLACENTA; ATP-DIPHOSPHOHYDROLASE; ECTO-ATPASE; PLASMA-MEMBRANE; PURIFICATION; LOCALIZATION; CHOLESTEROL; STEROIDOGENESIS; F1F0-ATPASE AB The human placental mitochondria, have an ATP-diphosphohydrolase (apyrase) activity. In this paper we characterized the effect of 5'-p-fluorosulfonylbenzoyl. adenosine (FSBA) on placental apyrase, and its repercussion on progesterone synthesis and oxygen consumption. Apyrase activity was inhibited by FSBA. Nucleosides tri- and diphosphates protected against FSBA inactivation, but divalent cations did not, indicating that FSBA attaches itself to an ATP-binding site of apyrase. In mitochondria, the inactivation of apyrase by FSBA was associated with inhibition of progesterone synthesis. Also, the oxygen consumption induced by ATP but not by ADP, was inhibited, clearly showing that FSBA exclusively inactivated the apyrase in human placental mitochondria. It is concluded that the apyrase activity is closely related to progesterone synthesis, probably associated with the cholesterol transport between mitochondrial membranes. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Dept Bioquim, Fac Med, Mexico City 04510, DF, Mexico. RP Martinez, F, Univ Nacl Autonoma Mexico, Dept Bioquim, Fac Med, Apartado Postal 70-159, Mexico City 04510, DF, Mexico. 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Biophys. Acta Mol. Cell Biol. Lipids PD NOV 8 PY 2002 VL 1585 IS 1 BP 11 EP 18 PG 8 SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA 622FQ UT ISI:000179636500002 ER PT J AU Sanchez, J Jose, MV TI Analysis of bilateral inverse symmetry in whole bacterial chromosomes SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article DE complementary triplets; bacterial replication origins; dot-plot analyses; codons in leading and lagging strands; strand asymmetry; Chargaff's DNA parity rules; bacterial genome evolution ID ASYMMETRIC SUBSTITUTION PATTERNS; ESCHERICHIA-COLI; REPLICATION ORIENTATION; BORRELIA-BURGDORFERI; GENOMES; SEQUENCE; STRAND; FREQUENCIES; OLIGOMERS; SKEW AB The positions of the 64 DNA tri-nucleotides (triplets) along the Borrelia burgdorferi chromosome were determined and cumulative position plots (CPP) were obtained. Analysis of CPP for complementary triplets revealed close correlations in complementary triplet frequencies (CTF) between opposing leading and lagging strands. Such bilateral inverse symmetry (BIS) applied also to complementary mono- and di-nucleotides and to some >3 n-tuples. At the level of individual bases BIS explains Chargaff's second parity rule for whole bacterial chromosomes. Using shuffled control sequences we show that single-base BIS was not the source of higher-order BIS. Analysis of CTF in 45 other chromosomes suggests that BIS is a general property of eubacteria. BIS at the various levels may be due to the very similar numbers of codons used in chromosomal halves. Evolutionarily, BIS could have resulted from asymmetric substitution of bases combined with genetic rearrangements. However, the provocative theoretical alternative of whole-genome inverse duplication is here considered. (C) 2002 Elsevier Science (USA). All rights reserved. C1 Univ Gothenburg, Dept Med Microbiol & Immunol, SE-41346 Gothenburg, Sweden. UAEM, Fac Med, Cuernavaca 62210, Morelos, Mexico. UNAM, Inst Invest Biomed, Mexico City 70228, DF, Mexico. RP Sanchez, J, Univ Gothenburg, Dept Med Microbiol & Immunol, SE-41346 Gothenburg, Sweden. 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Biophys. Res. Commun. PD NOV 22 PY 2002 VL 299 IS 1 BP 126 EP 134 PG 9 SC Biochemistry & Molecular Biology; Biophysics GA 619UW UT ISI:000179496700019 ER PT J AU Mena-Segovia, J Cintra, L Prospero-Garcia, O Giordano, M TI Changes in sleep-waking cycle after striatal excitotoxic lesions SO BEHAVIOURAL BRAIN RESEARCH LA English DT Article DE basal ganglia; striatum; Huntington's disease; kainic acid; sleep-wake cycle; wakefulness; arousal; PPT ID HUNTINGTONS-DISEASE; NEURONS AB Huntington's disease (HD) patients show severe diurnal choreic movements, while during slow-wave sleep (SWS) abnormal movements subside. Sleep disturbances in HD, including irregular delta activity and decreases in SWS, have also been reported. Striatal excitotoxic lesions have been shown to induce increased nocturnal spontaneous locomotor activity in rodents. In order to characterize the changes in circadian activity and sleep patterns and their correlation with motor activity after striatal excitotoxic lesions, Sprague-Dawley rats were implanted and lesioned; their locomotor and EEG activities were recorded for either 4 or 24 h during baseline or 7 and 30 days post-lesion. Locomotor activity increased significantly at 7 days post-lesion during the dark phase of the light-dark cycle. In contrast, total time spent in wakefulness (W) increased at 30 days post-lesion during the light phase of the cycle. This increase was at the expense of SWS duration. No disruption of the circadian curves was observed. Increases in the number of W-bouts and decreases in the duration of SWS-bouts were also observed. These results suggest the possible participation of the striaturn in the regulation of the sleep-waking cycle, independent of locomotor activity. The increase in W could be due to loss of inhibition of target structures involved in regulation of the sleep-waking cycle. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Neurobiol, Dept Behav & Cognit Neurobiol, Juriquilla 76230, Queretaro, Mexico. Inst Neurobiol, Dept Dev Neurobiol, Juriquilla 76230, Queretaro, Mexico. Univ Nacl Autonoma Mexico, Dept Physiol, Neurosci Grp, Fac Med, Queretaro 76230, Mexico. RP Mena-Segovia, J, Inst Neurobiol, Dept Behav & Cognit Neurobiol, Campus UNAM,POB 1-1141, Juriquilla 76230, Queretaro, Mexico. CR CORSICABRERA M, 1975, PHYSIOL BEHAV, V14, P7 FIBIGER D, 1978, KAINIC ACID TOOL NEU, P161 FISH DR, 1991, ARCH NEUROL-CHICAGO, V48, P210 GIORDANO M, 2001, BRAIN RES BULL, V56, P553 GROFOVA I, 1998, J COMP NEUROL, V395, P359 HEIMER L, 1995, RAT NERVOUS SYSTEM, P579 KANG Y, 1990, BRAIN RES, V535, P79 KODAMA T, 1999, PSYCHIAT CLIN NEUROS, V53, P109 PARENT A, 1995, BRAIN RES REV, V20, P91 REINER A, 1988, P NATL ACAD SCI USA, V85, P5733 SANBERG PR, 1984, CRIT REV NEURBIOL, V1, P1 SISHTA SK, 1974, ELECTROENCEPHALOGR C, V36, P387 STERIADE M, 2000, SLEEP MED, P93 VATAEV SI, 2000, ZH EVOLIUTSIONNOI BI, V36, P115 VILLABLANCA J, 1972, BRAIN RES, V36, P463 WIEGAND M, 1991, J NEUROL, V238, P203 NR 16 TC 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-4328 J9 BEHAV BRAIN RES JI Behav. Brain Res. PD NOV 15 PY 2002 VL 136 IS 2 BP 475 EP 481 PG 7 SC Behavioral Sciences; Neurosciences GA 620GC UT ISI:000179524800017 ER PT J AU Gavazzi, G Boselli, A Pedotti, P Gallazzi, A Carrasco, L TI H alpha surface photometry of galaxies in the Virgo cluster - IV. The current star formation in nearby clusters of galaxies SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE galaxies : photometry; galaxies : clusters : individual : Virgo ID DWARF IRREGULAR GALAXIES; 2.2 M TELESCOPE; SPIRAL GALAXIES; DISK GALAXIES; NEUTRAL HYDROGEN; EVOLUTION; COMA; GAS; SUPERCLUSTER; MORPHOLOGY AB Halpha + [NII] imaging observations of 369 late-type (spiral) galaxies in the Virgo cluster and in the Coma/A1367 supercluster are analyzed, covering 3 rich nearby clusters (A1367, Coma and Virgo) and nearly isolated galaxies in the Great-Wall. They constitute an optically selected sample (m(p) < 16.0) observed with &SIM;60% completeness. These observations provide us with the current (T < 10(7) yrs) star formation properties of galaxies that we study as a function of the clustercentric projected distances (Theta). The expected decrease of the star formation rate (SFR), as traced by the Halpha EW, with decreasing Theta is found only when galaxies brighter than M-p similar to -19.5 are considered. Fainter objects show no or reverse trends. We also include in our analysis Near Infrared data, providing information on the old (T > 109 yrs) stars. Put together, the young and the old stellar indicators give the ratio of currently formed stars over the stars formed in the past, or "birthrate" parameter b. For the considered galaxies we also determine the "global gas content" combining HI with CO observations. We define the "gas deficiency" parameter as the logarithmic difference between the gas content of isolated galaxies of a given Hubble type and the measured gas content. For the isolated objects we find that b decreases with increasing NIR luminosity. In other words less massive galaxies are currently forming stars at a higher rate than their giant counterparts which experienced most of their star formation activity at earlier cosmological epochs. The gas-deficient objects, primarily members of the Virgo cluster, have a birthrate significantly lower than the isolated objects with normal gas content and of similar NIR luminosity. This indicates that the current star formation is regulated by the gaseous content of spirals. Whatever mechanism (most plausibly ram-pressure stripping) is responsible for the pattern of gas deficiency observed in spiral galaxies members of rich clusters, it also produces the observed quenching of the current star formation. A significant fraction of gas "healthy" (i.e. with a gas deficiency parameter less than 0.4) and currently star forming galaxies is unexpectedly found projected near the center of the Virgo cluster. Their average Tully-Fisher distance is found approximately one magnitude further away (mu(o) = 31.77) than the distance of their gas-deficient counterparts (mu(o) = 30.85), suggesting that the gas healthy objects belong to a cloud projected onto the cluster center, but in fact lying a few Mpc behind Virgo, thus unaffected by the dense IGM of the cluster. C1 Univ Milano Bicocca, I-20126 Milan, Italy. Lab Astrophys Marseille, F-13376 Marseille 12, France. Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. UNAM, Observ Astron Nacl, Ensenada 22860, Baja California, Mexico. RP Gavazzi, G, Univ Milano Bicocca, Piazza Sci 3, I-20126 Milan, Italy. CR ALMOZNINO E, 1998, MON NOT R ASTRON SOC, V298, P920 BINGGELI B, 1985, ASTRON J, V90, P1681 BINGGELI B, 1993, ASTRON ASTROPHYS SUP, V98, P275 BOSELLI A, 1997, ASTRON ASTROPHYS SUP, V121, P507 BOSELLI A, 2000, ASTRON ASTROPHYS SUP, V142, P73 BOSELLI A, 2001, ASTRON J, V121, P753 BOSELLI A, 2002, ASTRON ASTROPHYS, V384, P33 BOSELLI A, 2002, ASTRON ASTROPHYS, V386, P124 BOSELLI A, 2002, ASTRON ASTROPHYS, V386, P134 BOTHUN GD, 1986, ASTROPHYS J, V301, P57 CAYATTE V, 1994, ASTRON J, V107, P1003 CONTURSI A, 2001, ASTRON ASTROPHYS, V365, P11 DRESSLER A, 1980, ASTROPHYS J, V236, P351 GAVAZZI G, 1991, ASTRON J, V101, P1207 GAVAZZI G, 1996, ASTRON ASTROPHYS SUP, V120, P489 GAVAZZI G, 1996, ASTRON ASTROPHYS SUP, V120, P521 GAVAZZI G, 1996, ASTRON ASTROPHYS, V312, P397 GAVAZZI G, 1996, ASTROPHYS LETT COMM, V35, P1 GAVAZZI G, 1998, ASTRON J, V115, P1745 GAVAZZI G, 1999, ASTRON ASTROPHYS SUP, V136, P227 GAVAZZI G, 1999, MON NOT R ASTRON SOC, V304, P595 GAVAZZI G, 2000, ASTRON ASTROPHYS SUP, V142, P65 GAVAZZI G, 2000, ASTRON ASTROPHYS, V361, P863 GAVAZZI G, 2001, ASTRON ASTROPHYS, V372, P29 GAVAZZI G, 2002, ASTRON ASTROPHYS, V386, P114 GIOVANELLI R, 1985, ASTROPHYS J, V292, P404 GIRARDI M, 1998, ASTROPHYS J 1, V505, P74 GUNN JE, 1972, ASTROPHYS J, V176, P1 HAYNES MP, 1984, ASTRON J, V89, P758 HELLER A, 1999, MON NOT R ASTRON SOC, V304, P8 HOFFMAN GL, 1996, ASTROPHYS J SUPPL S, V105, P269 IGLESIASPARAMO J, 2002, ASTRON ASTROPHYS, V384, P383 KENNICUTT RC, 1983, ASTRON J, V88, P1094 KENNICUTT RC, 1983, ASTRON J, V88, P483 KENNICUTT RC, 1984, ASTRON J, V89, P1279 KENNICUTT RC, 1989, ASTROPHYS J, V344, P685 KENNICUTT RC, 1994, ASTROPHYS J 1, V435, P22 KENNICUTT RC, 1998, ANNU REV ASTRON ASTR, V36, P189 KOOPMANN RA, 2001, ASTROPHYS J SUPPL S, V135, P125 LEWIS I, 2002, MON NOT R ASTRON SOC, V334, P673 MAYER L, 2001, ASTROPHYS J 1, V559, P754 MOORE B, 1996, NATURE, V379, P613 MOORE B, 1998, ASTROPHYS J 1, V495, P139 MOSS C, 1998, MON NOT R ASTRON SOC, V300, P205 ROMANISHIN W, 1990, ASTRON J, V100, P373 SCODEGGIO M, 1993, ASTROPHYS J 1, V409, P110 SCODEGGIO M, 2002, ASTRON ASTROPHYS, V384, P812 SOLANES JM, 2001, ASTROPHYS J 1, V548, P97 TULLY B, 1977, A A, V54, P661 USUI T, 1998, ASTRON J, V116, P2166 YOUNG JS, 1996, ASTRON J, V112, P1903 ZWICKY F, 1961, CATALOGUE GALAXIES C NR 52 TC 13 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD DEC PY 2002 VL 396 IS 2 BP 449 EP 461 PG 13 SC Astronomy & Astrophysics GA 621DY UT ISI:000179574300012 ER PT J AU Conan, R Avila, R Sanchez, LJ Ziad, A Martin, F Borgnino, J Harris, O Gonzalez, SI Michel, R Hiriart, D TI Wavefront outer scale and seeing measurements at San Pedro Martir Observatory SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE atmospheric effects; turbulence; site testing; techniques : high angular resolution; instrumentation : adaptive optics ID BAJA-CALIFORNIA; IMAGE MOTION; MONITOR AB The first measurements of the spatial coherence outer scale at the Observatorio Astronomico Nacional at San Pedro Martir (OAN-SPM) are reported along with long term seeing measurements. These parameters were measured with the Generalized Seeing Monitor and with a Differential Image Motion Monitor. An instrumented mast was also used to measure the structure constant of the refractive index C-n(2) in the first 15 m. Log-normal statistics were found for the seeing and for the outer scale, with median values of 0.92" and 27.0 m, respectively. The distribution of the outer scale values is similar to that found in other observatories around the world, suggesting that the presence of trees in the OAN-SPM do not affect the outer scale values. Correlation studies suggest that large values of the seeing and the outer scale are likely to occur when the wind blows from the SSW. Further studies are recommended to confirm this tendency. C1 European So Observ, D-85748 Garching, Germany. UNAM, Inst Astron, Morelia 58089, Michoacan, Mexico. Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. Univ Nice Sophia Antipolis, CNRS, UMR 6525, F-06108 Nice 2, France. UNAM, Inst Astron, Ensenada 22800, Baja California, Mexico. RP Conan, R, European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany. CR ALVAREZ M, 1969, 5 U NAC AUT MEX I AS, P5 AVILA R, 1998, PUBL ASTRON SOC PAC, V110, P1106 AVILA R, 2001, SIT 2000 IAU TECHN W BORGNINO J, 1990, APPL OPTICS, V29, P1863 ECHEVARRIA J, 1998, REV MEX ASTRON ASTR, V34, P47 EHGAMBERDIEV SA, 2000, ASTRON ASTROPHYS SUP, V145, P293 FRIED DL, 1982, J OPT SOC AM, V72, P52 HIRIART D, 1997, REV MEX ASTRON ASTR, V33, P59 MARTIN F, 1988, VLTTREUNI174400006 E MARTIN F, 1994, ASTRON ASTROPHYS SUP, V108, P173 MARTIN F, 1998, VLTTREUNI174400005 E MARTIN HM, 1987, PUBL ASTRON SOC PAC, V99, P1360 MASCIADRI E, 2002, ASTRON ASTROPHYS, V382, P378 MICHEL R, 2001, REV MEX ASTRON ASTR, V37, P165 RODDIER F, 1981, PROGR OPTICS, V19 SARAZIN M, 1990, ASTRON ASTROPHYS, V227, P294 TAPIA M, 1992, REV MEX ASTRON ASTR, V24, P179 TOKOVININ AA, 1998, P SOC PHOTO-OPT INS, V3353, P1155 VERNIN J, 1995, PUBL ASTRON SOC PAC, V107, P265 ZIAD A, 2000, APPL OPTICS, V39, P5415 NR 20 TC 5 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD DEC PY 2002 VL 396 IS 2 BP 723 EP 730 PG 8 SC Astronomy & Astrophysics GA 621DY UT ISI:000179574300038 ER PT J AU Feoli, E Badilla, V Bermudez, M Mendez, E Badilla, X TI Surgery in Costa Rica SO ARCHIVES OF SURGERY LA English DT Article C1 Univ Latinoamer Ciencia & Tecnol Costa Rica, Res Ctr, San Jose, Costa Rica. Univ Latinoamer Ciencia & Tecnol Costa Rica, Dept Expt Surg, San Jose, Costa Rica. Hosp Mexico, Serv Thorac Surg, Mexico City, DF, Mexico. Caja Costarricense Seguro Social, Dept Epidemiol Vigilance, San Jose, Costa Rica. RP Feoli, E, Univ Latinoamer Ciencia & Tecnol Costa Rica, Res Ctr, POB 5840-1000, San Jose, Costa Rica. CR 2002, VOZ PENSAMIENTO AZTE ANTILLON JJ, 1993, SALUD SEGURIDAD SOCI ANTILLON JJ, 1998, PRINCIPIOS GERENCIA CANTILLO LD, 2002, NACION APR DELACRUZ Y, 1995, FORJADORES SEGURIDAD GUTIERREZ GM, 1994, SEGURIDAD SOCIAL DES PACHECO CEG, 1995, HOSP JUAN DIOS 159 A REESE GP, 1987, MED NEW WORLD NEW SP, P12 SOLERA EC, 1998, HIST CIRUGIA COSTA R TEPASK JJ, 1997, REL PROTOMEDICATO RE NR 10 TC 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 USA SN 0004-0010 J9 ARCH SURG JI Arch. Surg. PD DEC PY 2002 VL 137 IS 12 BP 1435 EP 1440 PG 6 SC Surgery GA 622RV UT ISI:000179661500024 ER PT J AU Tentori, D Camacho, J TI Conosdopic evaluation of the birefringence of gradient-index lenses: infidelity sources SO APPLIED OPTICS LA English DT Article AB Gradient-index lenses are samples whose special characteristics must be taken into account to design the optical polariscopes that can be applied in the evaluation of their birefringence. We discuss the main infidelity sources that modify the conoscopic patterns when a traditional polariscopic setup is used. (C) 2002 Optical Society of America. C1 Ctr Invest, Ensenada, Baja California, Mexico. Ctr Ensenanza Super Ensenada, Ensenada, Baja California, Mexico. RP Tentori, D, Ctr Invest, Ensenada, Baja California, Mexico. CR 1999, SELFOC PRODUCT CATAL, P7 BLOSS FD, 1994, INTRO METODOS CRISTA, P124 CAMACHO J, 2001, J OPT A-PURE APPL OP, V3, P89 FRANCON M, 1971, POLARIZATION INTERFE, P140 JONES RC, 1941, J OPT SOC AM, V31, P488 MARCHAND EW, 1978, GRADIENT INDEX OPTIC, P53 SU W, 1986, APPL OPTICS, V35, P4772 TENTORI D, 2002, OPT ENG, V41, P2468 TOLANSKY S, 1973, INTRO INTERFEROMETRY, P203 WOZNIAK WA, 1989, OPT APPL, V19, P429 NR 10 TC 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPT JI Appl. Optics PD DEC 1 PY 2002 VL 41 IS 34 BP 7218 EP 7228 PG 11 SC Optics GA 620UT UT ISI:000179551400010 ER PT J AU Castellanos, JL Gomez, S Guerra, V TI The triangle method for finding the corner of the L-curve SO APPLIED NUMERICAL MATHEMATICS LA English DT Article DE CG-method; regularization; L-curve; ill-conditioned matrices; systems of linear equations ID REGULARIZATION AB The Conjugate Gradient Method (CG) has an intrinsic regularization property when applied to systems of linear equations with ill-conditioned matrices. This regularization property is specially useful when either the right-hand side or the coefficient matrix, or both are given with errors. The regularization parameter is the iteration number, and in order to find this parameter, the L-curve is used. Here we present a novel method to find the corner of the L-curve, that determines the regularizing iteration number. Numerical results on the collection of test problems [SIAM J. Sci. Comput. 16 (1995) 506-512] are given to illustrate the potentiality of the method. (C) 2002 IMACS. Published by Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, IIMAS, Mexico City 01000, DF, Mexico. RP Gomez, S, Univ Nacl Autonoma Mexico, IIMAS, Apartado Postal 20-726, Mexico City 01000, DF, Mexico. CR BJORCK A, 1998, SIAM J MATRIX ANAL A, V19, P720 CALVETTI D, 1999, BIT, V39, P603 CALVETTI D, 2001, IMM20015 TU DENM ENGL H, 1996, REGULARIZATION INVER GOLUB GH, 1996, MATRIX COMPUTATIONS GUERRA V, 2001, APPROXIMATION OPTIMI, P121 HANKE M, 1995, RES NOTES MATH SERIE HANSEN PC, 1993, SIAM J SCI COMPUT, V14, P1487 HANSEN PC, 1994, NUMER ALGORITHMS, V6, P1 HANSEN PC, 1995, SIAM J SCI COMPUT, V16, P506 HANSEN PC, 1998, RANK DEFICIENT DISCR KAUFMAN L, 1996, IEEE T MED IMAG, V15 LAWSON CL, 1974, SOLVING LEAST SQUARE MILLER K, 1970, SIAM J MATH ANAL, V1, P52 NATTERER F, 1986, MATH COMPUTERIZED TO NEMIROVSKII AS, 1986, ZH VYCHISL MAT MAT F, V26, P332 TIKHONOV AN, 1963, DOKL AKAD NAUK SSSR, V151, P501 VANDERSLUIS A, 1986, NUMER MATH, V48, P543 NR 18 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD DEC PY 2002 VL 43 IS 4 BP 359 EP 373 PG 15 SC Mathematics, Applied GA 621LK UT ISI:000179590200003 ER PT J AU Vandermeer, J Perfecto, I Nunez, GI Phillpott, S Ballinas, AG TI Ants (Azteca sp.) as potential biological control agents in shade coffee production in Chiapas, Mexico SO AGROFORESTRY SYSTEMS LA English DT Article DE food webs; integrated pest management; natural enemies; pest control; shade trees AB The role of Azteca sp. ants as potential biological control agents was studied in an organic coffee farm in Chiapas, Mexico. Individual larvae of Pieris rapae were placed on trees with artificially enhanced ant activity and both time to disappearance of the larvae and ant activity were recorded. There was a general negative relationship between time to disappearance and ant activity. A census of spiders was made of coffee bushes with and without foraging Azteca, encountering a negative relationship between ants and spiders. These results indicate that Azteca ants have potential as pests through their positive effect on scale insects, but also have potential as biological control agents, through their negative effect on potential herbivores. Furthermore, the correlation between ant and spider densities suggests a complicated relationship between these two predatory organisms, implying a more complicated food web structure than simply ants, homoptera and other herbivores. C1 Univ Michigan, Dept Ecol & Evolut Biol, Ann Arbor, MI 48109 USA. Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI USA. Escuela Frontera Sur ECOSUR, Tapachula, Chiapas, Mexico. RP Vandermeer, J, Univ Michigan, Dept Ecol & Evolut Biol, Ann Arbor, MI 48109 USA. CR ABRAMS PA, 1995, AM NAT, V146, P112 ABRAMS PA, 1996, FOOD WEBS DYNAMICS S CUSHMAN JH, 1998, OECOLOGIA, V116, P373 DIXON AFG, 1971, J APPL ECOL, V8, P393 MOGUEL P, 1999, CONSERV BIOL, V13, P1 PERFECTO I, 1994, ENTOMOLOGY, V2, P7 PERFECTO I, 1996, BIOSCIENCE, V46, P598 ROOM PM, 1972, J ANIM ECOL, V41, P611 WERNER EE, 1996, ECOLOGY, V77, P157 NR 9 TC 6 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0167-4366 J9 AGROFOREST SYST JI Agrofor. Syst. PD DEC PY 2002 VL 56 IS 3 BP 271 EP 276 PG 6 SC Agronomy; Forestry GA 621VP UT ISI:000179612000010 ER PT J AU Lobell, DB Ortiz-Monasterio, JI Addams, CL Asner, GP TI Soil, climate, and management impacts on regional wheat productivity in Mexico from remote sensing SO AGRICULTURAL AND FOREST METEOROLOGY LA English DT Article DE carbon cycle; climate impacts; remote sensing; wheat; yield; yield loss ID NET PRIMARY PRODUCTION; TERRESTRIAL ECOSYSTEMS; FOOD-PRODUCTION AB Understanding sources of variability in net primary productivity is critical for projecting ecosystem responses to global change, as well as for improving management in agricultural systems. However, the processes controlling productivity cannot be fully addressed with field-, or global-scale observations. In this study, we performed a regional observational experiment using remote sensing to analyze sources of yield variability in an irrigated wheat system in Northwest Mexico. Four different soil types and 3 years with contrasting weather served as the two main experimental factors, while remotely sensed yields provided thousands of observations within each treatment. Analysis of variance revealed that 6.6 and 4.6% of the variability in yields could be explained by soil type and climate, respectively, with a negligible fraction explained by soil-type-climate interactions. The majority of the variability in yields (88.6%) was observed within treatments and was attributed mainly to variations in management. The impacts of management were observed to depend significantly on both soil type and climate, as revealed by distributions of yields within each treatment. The results indicate that changes in management will have the greatest impact on regional production, and will also play a large role in determining the impact of any changes in climate or soil. This work also demonstrates the use of consistent remote sensing estimates to perform regional studies unfeasible with field-based approaches. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Carnegie Inst Washington, Dept Global Ecol, Stanford, CA 94305 USA. Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA. CIMMYT, Int Maize & Wheat Improvement Ctr, Wheat Program, Mexico City 06600, DF, Mexico. RP Lobell, DB, Carnegie Inst Washington, Dept Global Ecol, 290 Panama St, Stanford, CA 94305 USA. CR *IPCC, 2001, CLIM CHANG 2001 IMP CASSMAN KG, 1995, AGR SUSTAINABILITY E, P63 CASSMAN KG, 1999, P NATL ACAD SCI USA, V96, P5952 CURRAN PJ, 1998, PROG PHYS GEOG, V22, P61 DEVRIES FWTP, 1997, PHILOS T ROY SOC B, V352, P917 DOOS BR, 1999, GLOBAL ENVIRON CHANG, V9, P261 FIELD CB, 1995, REMOTE SENS ENVIRON, V51, P74 LOBELL DB, 2002, GLOBAL CHANGE BIOL, V8, P722 LOBELL DB, 2002, IN PRESS AGR ECOSYST MALMSTROM CM, 1997, GLOBAL BIOGEOCHEM CY, V11, P367 MATSON PA, 1998, SCIENCE, V280, P112 MONTEITH JL, 1972, J APPL ECOL, V9, P747 MONTEITH JL, 1977, PHILOS T ROY SOC B, V281, P277 PIELKE RA, 1998, GLOB CHANGE BIOL, V4, P461 PINGALI PL, 1999, CIMMYT 1998 1999 WOR SAHAI H, 2000, ANAL VARIANCE SCHIMEL DS, 2001, NATURE, V414, P169 NR 17 TC 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1923 J9 AGR FOREST METEOROL JI Agric. For. Meteorol. PD DEC 30 PY 2002 VL 114 IS 1-2 BP 31 EP 43 PG 13 SC Agronomy; Forestry; Meteorology & Atmospheric Sciences GA 621YF UT ISI:000179618000003 ER PT J AU Pech, GG Brito, WF Mena, GJ Quijano, L TI Constituents of Acacia cedilloi and Acacia gaumeri. Revised structure and complete NMR assignments of resinone SO ZEITSCHRIFT FUR NATURFORSCHUNG C-A JOURNAL OF BIOSCIENCES LA English DT Article DE Acacia; triterpenes; NMR ID LUPEOL AB The rare lupene derivative named resinone has only been isolated before from Fluorensia resinosa. We now report the isolation of this compound from the bark of the new recently described Acacia cedilloi (Fabaceae), and the revision of its structure to 16beta-hydroxylup-20(29)-en-3-one, based on NMR and MS spectral data. The detailed H-1 and C-13 NMR assignments of resinone and its acetate achieved by 1D and 2D NMR experiments (including DEPT, COSY, HMQC and HMBC) are reported. In addition, the study of A. cedilloi and A. gaumeri afforded the known related lupenes lupeol and lupenone, the acyclic squalene, the sterols beta-sitosterol, stigmasta-7,22-dien-3beta-ol (spinasterol) and stigmasta-5,22,25-trien-3beta-ol (22-dehydroclerosterol) as well as a-tocopherol and beta-carotene. C1 UNAM, Inst Quim, Mexico City 04510, DF, Mexico. Univ Autonoma Yucatan, Fac Quim, Dept Quim Organ, Merida 97150, Yuc, Mexico. RP Quijano, L, UNAM, Inst Quim, Circuito Exterior,Ciudad Univ, Mexico City 04510, DF, Mexico. CR ANAYA J, 1989, PHYTOCHEMISTRY, V28, P2206 BADDELEY GV, 1964, AUST J CHEM, V17, P908 BURNS D, 2000, MAGN RESON CHEM, V38, P488 JOLAD SD, 1969, J ORG CHEM, V34, P1367 KASPRZYK Z, 1968, PHYTOCHEMISTRY, V7, P1631 KASPRZYK Z, 1970, PHYTOCHEMISTRY, V9, P2065 PROTIVA J, 1977, COLLECT CZECH CHEM C, V42, P140 RICOARCE ML, 1994, ACTA BOTANICA MEXICA, V26, P7 RODRIGUEZHAHN L, 1973, REV LATINOAM QUIM, V3, P148 TANAKA R, 1993, PHYTOCHEMISTRY, V32, P472 WENKERT E, 1978, ORG MAGN RESONANCE, V11, P337 NR 11 TC 3 PU VERLAG Z NATURFORSCH PI TUBINGEN PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY SN 0939-5075 J9 Z NATURFORSCH C JI Z.Naturforsch.(C) PD SEP-OCT PY 2002 VL 57 IS 9-10 BP 773 EP 776 PG 4 SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy GA 620BB UT ISI:000179512100002 ER PT J AU Mena-Rejon, GJ Perez-Rivas, K Sansorez-Peraza, P Rios, T Quijano, L TI Racemochrysone, a dihydroanthracenone from Senna racemosa SO ZEITSCHRIFT FUR NATURFORSCHUNG C-A JOURNAL OF BIOSCIENCES LA English DT Article DE Senna; anthraquinones ID CASSIA-TOROSA; CONSTITUENTS; DRUGS AB From the hexane extract of the bark of the stems of Senna racemosa (syn. Cassia racemosa) a new dihydroanthracenone derivative, named racemochrysone, was isolated. Its structure was established as 8,9-dihydroxy-3-methoxy-2,2,6-trimethyl- (2H)-anthracen-1-one based on spectroscopical data, mainly 1D and 2D NMR experiments. In addition P-sitosterol, stigmasterol, chrysophanol and physcion were obtained. From the leaves extracts the piperidine alkaloid cassine and the hexitol pinitol were obtained. C1 UNAM, Inst Quim, Mexico City 04510, DF, Mexico. Univ Autonoma Yucatan, Fac Quim, Dept Quim Organ, Merida 97150, Yuc, Mexico. RP Quijano, L, UNAM, Inst Quim, Circuito Exterior,Ciudad Univ, Mexico City 04510, DF, Mexico. CR CALLE J, 1987, PLANTA MED, V3, P303 HIGHET RJ, 1964, J ORG CHEM, V29, P471 IRWIN HS, 1982, MEM NEW YORK BOT GAR, V35, P1 TAKAHASHI S, 1976, PHYTOCHEMISTRY, V15, P1295 TAKIDO M, 1977, LLOYDIA, V40, P191 TAMANO M, 1982, AGR BIOL CHEM TOKYO, V46, P1913 NR 6 TC 0 PU VERLAG Z NATURFORSCH PI TUBINGEN PA POSTFACH 2645, W-7400 TUBINGEN, GERMANY SN 0939-5075 J9 Z NATURFORSCH C JI Z.Naturforsch.(C) PD SEP-OCT PY 2002 VL 57 IS 9-10 BP 777 EP 779 PG 3 SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy GA 620BB UT ISI:000179512100003 ER PT J AU Jaime-Perez, JC Gomez-Almaguer, D Herrera-Garza, JL Marfil-Rivera, LJ Gonzalez-Llano, O TI Platelet aggregation responses in acute lymphoblastic leukemia evaluated during induction of remission treatment. SO TRANSFUSION LA English DT Meeting Abstract C1 Univ Autonoma Nuevo Leon, Sch Med, Monterrey, Mexico. Univ Autonoma Nuevo Leon, Univ Hosp, Monterrey, Mexico. NR 0 TC 0 PU AMER ASSOC BLOOD BANKS PI BETHESDA PA 8101 GLENBROOK RD, BETHESDA, MD 20814-2749 USA SN 0041-1132 J9 TRANSFUSION JI Transfusion PD SEP PY 2002 VL 42 IS 9 SU Suppl. S BP 51S EP 52S PG 2 SC Hematology GA 592MP UT ISI:000177941700189 ER PT J AU Moravec, F Salgado-Maldonado, G TI Redescription of Perezitrema bychowskyi (Caballero & Caballero, 1975) (Trematoda : Macroderoididae), with remarks on the systematic status of Perezitrema Barus & Moravec, 1996 SO SYSTEMATIC PARASITOLOGY LA English DT Article ID DIGENEA AB A description is given of Perezitrema bychowskyi (Caballero & Caballero, 1975) based on newly collected specimens from the intestine of the tropical gar Atractosteus tropicus Gill in the Pantalos de Centla Biological Reserve, State of Tabasco, southeastern Mexico, collected in April 2001, and on a re-examination of the type-specimens. In contrast to the original description, the excretory vesicle of P. bychowskyi was found to be elongate saccular and the intestinal caeca join near the posterior extremity and open via a common median anus. These features, and the presence of a cirrus-sac, were found, using differential interference contrast optics in the type-specimens of P. viguerasi Barus & Moravec, 1967, the type-species of the genus. This made possible a re-diagnosis of Perezitrema Barus & Moravec, 1967. Although P. bychowskyi is very similar to P. viguerasi and their conspecificity cannot be excluded, the poor condition of the type-specimens of the latter does not enable their detailed comparison and, consequently, both are considered independent species for the time being. P. lepisostei (Watson, 1976) is considered a junior synonym of P. bychowskyi. Perezitrema is provisionally placed in the plagiorchioid family Macroderoididae, even though some of its morphological features are similar to those of the lepocreadioid families Enenteridae and Lepocreadiidae. C1 Acad Sci Czech Republ, Inst Parasitol, CR-37005 Ceske Budejovice, Czech Republic. Natl Autonomous Univ Mexico, Inst Biol, Mexico City 04510, DF, Mexico. RP Moravec, F, Acad Sci Czech Republ, Inst Parasitol, Branisovska 31, CR-37005 Ceske Budejovice, Czech Republic. CR BARUS V, 1967, ACTA SOC ZOOL BOHEMO, V31, P1 BRAY RA, 2001, SYST PARASITOL, V48, P1 BROOKS DR, 1980, ZOOL J LINN SOC-LOND, V70, P313 BROOKS DR, 2000, ZOOL SCR, V29, P237 CABALLERO E, 1975, REV BIOL TROP, V22, P217 CRIBB TH, 2001, INTERRELATIONSHIPS P, P168 FROESE R, 2001, FISHBASE GIBSON DI, 1996, CANADIAN SPECIAL PUB, V124 MORAVEC F, 1971, ACTA SOC ZOOL BOHEMO, V35, P56 MORAVEC F, 2002, IN PRESS J PARASITOL OSORIOSARABIA D, 1987, U CIENCIA, V4, P5 SALGADOMALDONAD.G, 2003, IN PRESS COMP PARASI SKRYABIN KI, 1965, OSNOVY TREMATODOLOGI, V22, P477 VIDALMARTINEZ VM, 2001, ATLAS HELMINTH PARAS WATSON DE, 1976, INVESTIGATIONS ICHTH, P251 YAMAGUTI S, 1971, SYNOPSIS DIGENET 1 2 YAMAGUTI S, 1975, SYNOPTICAL REV LIFE NR 17 TC 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0165-5752 J9 SYST PARASITOL JI Syst. Parasitol. PD NOV PY 2002 VL 53 IS 3 BP 199 EP 206 PG 8 SC Parasitology GA 617QW UT ISI:000179373200006 ER PT J AU Betancur-Ancona, D Garcia-Cervera, E Canizares-Hernandez, E Chel-Guerrero, L TI Chemical modification of Jack Bean (Canavalia ensiformis) starch by succinylation SO STARCH-STARKE LA English DT Article DE canavalia starch; succinylation; functional properties ID FUNCTIONAL-PROPERTIES; CHICKS; SEEDS; ACID AB Canavalia ensiformis native starch was succinylated and the functional properties of the succinylated starch evaluated. Reaction conditions investigated included: pH (8.0-8.5 and 9.0-9.5), succinic anhydride concentration (3 and 4%), temperature (20 and 30 degreesC) and reaction time (1 and 3 h). When starch was succinylated with 4% succinic anhydride, at pH 8.0-8.5, at 30 degreesC for 1 h, 1.58% succinylation was obtained. Com pared to native Canavalia starch, these succinylated products exhibited increasing paste and gel clarity, solubility (36%), swelling power (46.2 g water/g starch), and viscosity (86.5 mPas). Gelatinization temperature range was reduced to 67-73 degreesC and retrogradation was eliminated. The use of succinylated Canavalia starches as thickening and stabilizing agents in ice creams, fruit jellies, baked products, sauces and frozen foods is suggested. C1 Univ Autonoma Yucatan, Fac Ingn Quim, Merida 97288, Venezuela. Univ Autonaoma Campeche, Fac Ciencias Quim Biol, Campeche, Mexico. RP Betancur-Ancona, D, Univ Autonoma Yucatan, Fac Ingn Quim, Av Juarez 421,Cd Ind,Apdo Postal 1226-A, Merida 97288, Venezuela. CR *AACC, 1983, APPR METH AACC *AOAC, 1997, OFF METH AN ASS OFF AGBOOLA SO, 1991, STARCH-STARKE, V43, P62 BAEZ RE, 1996, THESIS U HABANA CUBA BETANCUR AD, 1997, J AGR FOOD CHEM, V45, P378 BETANCURANCONA DA, 2001, STARCH-STARKE, V53, P219 BILIADERIS CG, 1991, CAN J PHYSIOL PHARM, V69, P60 CHELGUERRERO L, 1998, J AGR FOOD CHEM, V46, P2087 DUKE JA, 1985, HDB LEGUMES WORLD EC, P39 FLECHE G, 1985, STARCH CONVERSION TE, P73 GILBERT GA, 1964, METHODS CARBOHYDRATE, P156 JAROWENKO W, 1986, MODIFIED STARCHES PR, P55 KESSLER M, 1990, TROP AGR, V67, P16 LEON A, 1989, ANN ZOOTECH, V38, P209 LEON AI, 1991, 1 SEM TALL C ENS MAR MOGUEL OY, 1996, TECNOL ALIMENT MEXIC, V31, P11 MONTGOMERY DC, 1991, DISENO ANAL EXPT, P175 NIETO LM, 1993, THESIS U AUTONOMA YU PHILLIPS DL, 2000, J AGR FOOD CHEM, V48, P5105 POMERANZ Y, 1991, FUNCTIONAL PROPERTIE, P24 SATHE SK, 1981, J FOOD SCI, V46, P617 SCHOCH JT, 1964, METHODS CARBOHYDRATE, P106 SIVOLIRODRIGUEZ L, 1996, TECNOL ALIMENT, V31, P5 SMITH RL, 1964, METHODS CARBOHYDRATE, P240 THOMPSON LU, 1986, J FOOD SCI, V51, P150 TJAHJADI C, 1984, J FOOD SCI, V49, P558 WATSON SA, 1964, METHODS CARBOHYDRATE, P268 WHISTLER R, 1990, FOOD ADDITIVES, P399 WHISTLER RL, 1967, STARCH CHEM TECHNOLO, P369 WIESENBORN DP, 1994, J FOOD SCI, V59, P644 WURZBURG OB, 1964, METHODS CARBOHYDRATE, P240 WURZBURG OB, 1986, MODIFIED STARCHES PR, P3 WURZBURG OB, 1995, FOOD POLYSACCHARIDES, P67 NR 33 TC 2 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0038-9056 J9 STARCH JI Starch-Starke PD NOV PY 2002 VL 54 IS 11 BP 540 EP 546 PG 7 SC Food Science & Technology GA 618QR UT ISI:000179429200006 ER PT J AU Ramirez, LE Castro, M Mendez, M Lacaze, J Herrera, M Lesoult, G TI Precipitation path of secondary phases during solidification of the Co-25.5%Cr-5.5%Mo-0.26%C alloy SO SCRIPTA MATERIALIA LA English DT Article DE solidification; biomaterials; casting; carbides ID CARBIDE AB The solidification of the alloy ASTM F-75 ends with sigma phase formation instead of M7C3 carbide as presumed from literature. The M23C6 carbide observed in cast specimens precipitates from the sigma phase (a) according to the global reaction sigma + C --> M23C6 over the range 1403-1303 K. Additionally, lamellar carbides appear below 1262 K for cooling rates lower than 35 K/min. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved. C1 CINVESTAV, IPN, Ctr Invest & Estudios Avanzados, Saltillo 25000, Coahuila, Mexico. UPS, INPT, CNRS, UMR 5085,CIRIMAT, F-31077 Toulouse 4, France. ENSMN, CNRS, UMR 7584, Lab Sci & Genie Mat Met, F-54042 Nancy, France. RP Castro, M, CINVESTAV, IPN, Ctr Invest & Estudios Avanzados, Carr Saltillo Monterrey Km 13,A Postal 663, Saltillo 25000, Coahuila, Mexico. CR CAUDILLO M, 2002, J BIOMED MATER RES, V59, P378 CLEMOW AJT, 1979, J BIOMED MATER RES, V13, P265 DOBBS HS, 1983, J MATER SCI, V18, P391 JIANG WH, 1999, METALL MATER TRANS A, V30, P513 KILNER T, 1982, J BIOMED MATER RES, V16, P63 LANE J, 1952, ASM T, V44, P113 OUICHOU L, 1980, P 4 INT S SUP 7 SPRI, P235 SILVERMAN R, 1956, T ASM, V49, P805 SUNDMAN B, 1985, CALPHAD, V9, P153 WETTON JW, 1954, T ASM, V47, P815 WOULDS MJ, 1969, COBALT, V42, P3 YOUDELIS WV, 1983, MET SCI, V17, P379 NR 12 TC 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-6462 J9 SCRIPTA MATER JI Scr. Mater. PD DEC 9 PY 2002 VL 47 IS 12 BP 811 EP 816 PG 6 SC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering GA 618QX UT ISI:000179429700004 ER PT J AU Smith, SV Renwick, WH Bartley, JD Buddemeier, RW TI Distribution and significance of small, artificial water bodies across the United States landscape SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article DE artificial water bodies; sediment accumulation; hydrology; conterminous United States ID CARBON BURIAL; SEDIMENTATION; RESERVOIRS; DISCHARGE; EROSION; CYCLE AB At least 2.6 million small, artificial water bodies dot the landscape of the conterminous United States; most are in the eastern half of the country. These features account for approximately 20% of the standing water area across the United States, and their impact on hydrology, sedimentology, geochemistry, and ecology is apparently large in proportion to their area. These features locally elevate evaporation, divert and delay downstream water flow, and modify groundwater interactions. They apparently intercept about as much eroded soil as larger, better-documented reservoirs. Estimated vertical accretion rates are much higher, hence, inferred sedimentary chemical reactions must be different in the small features than in larger ones. Finally, these features substantially alter the characteristics of aquatic habitats across the landscape. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Hawaii, Dept Oceanog, Honolulu, HI 96822 USA. Miami Univ, Dept Geog, Oxford, OH 45056 USA. Univ Kansas, Kansas Geol Survey, Lawrence, KS 66047 USA. RP Smith, SV, CICESE, Dept Ecol, Ensenada, Baja California, Mexico. CR *OKL WAT RES BOARD, 1990, PUBL OKL WAT RES BOA CARRIQUIRY JD, 1999, MAR GEOL, V158, P125 DAHL TE, 1991, WETLANDS STATUS TREN DEAN WE, 1998, GEOLOGY, V26, P535 DENDY FE, 1978, MISC PUB USDA, V1362 DYNESIUS M, 1994, SCIENCE, V266, P753 GRAF WL, 1999, WATER RESOUR RES, V35, P1305 HARBECK GE, 1962, 272E US GEOL SURV PR, P101 HAYESBOHANAN J, 1989, THESIS MIAMI U HOLLAND DD, 1971, B KANSAS WATER RESOU, V16 HUTCHINSON GE, 1957, GEOGRAPHY PHYSICS 1 MANDELBROT B, 1967, SCIENCE, V156, P636 MEADE RH, 1990, SURFACE WATER HYDROL, P255 MILLIMAN JD, 1992, J GEOL, V100, P525 MITSCH WJ, 1993, WETLANDS MULHOLLAND PJ, 1982, TELLUS, V34, P490 RENWICK WH, 1996, IAHS-AISH P, P513 RICE CW, 2002, GEOTIMES, V47, P14 RITCHIE JC, 1989, WATER RESOUR BULL, V25, P301 SCHLESINGER WH, 1997, BIOGEOCHEMISTRY ANAL SEABER PR, 1987, 2294 US GEOL SURV SMITH SV, 2001, GLOBAL BIOGEOCHEM CY, V15, P697 SORENSON LG, 1998, CLIMATIC CHANGE, V40, P343 STALLARD RF, 1998, GLOBAL BIOGEOCHEM CY, V12, P231 STLOUIS VL, 2000, BIOSCIENCE, V50, P766 SVERDRUP HU, 1942, OCEANS THEIR PHYSICS TRIMBLE SW, 1990, ENV PROFESSIONAL, V12, P255 VOROSMARTY CJ, 2000, BIOSCIENCE, V50, P753 WALLING DE, 1983, J HYDROL, V65, P209 WILLIAMS G, 1984, 1286 US GEOL SURV NR 30 TC 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-9697 J9 SCI TOTAL ENVIR JI Sci. Total Environ. PD NOV 1 PY 2002 VL 299 IS 1-3 BP 21 EP 36 PG 16 SC Environmental Sciences GA 619DP UT ISI:000179459100002 ER PT J AU Funes, S Davidson, E Reyes-Prieto, A Magallon, S Herion, P King, MP Gonzalez-Halphen, D TI A green algal apicoplast ancestor SO SCIENCE LA English DT Article ID MITOCHONDRIAL GENOME; PARASITES; NUCLEAR; GENES; APICOMPLEXAN; EVOLUTION; PLASTIDS; ORIGIN; DNA C1 Univ Nacl Autonoma Mexico, Inst Fisiol Celular, Mexico City 04510, DF, Mexico. Thomas Jefferson Univ, Dept Mol Pharmacol & Biochem, Philadelphia, PA 19107 USA. Univ Nacl Autonoma Mexico, Inst Invest Biomed, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Biol, Mexico City 04510, DF, Mexico. RP Gonzalez-Halphen, D, Univ Nacl Autonoma Mexico, Inst Fisiol Celular, Mexico City 04510, DF, Mexico. CR ADAMS KL, 1999, P NATL ACAD SCI USA, V96, P13863 FAST NM, 2001, MOL BIOL EVOL, V18, P418 FEAGIN JE, 2000, INT J PARASITOL, V30, P371 GRAY MW, 1999, CURR OPIN GENET DEV, V9, P678 KOHLER S, 1997, SCIENCE, V275, P1485 MCFADDEN GI, 1997, BIOESSAYS, V19, P1033 NEDELCU AM, 2000, GENOME RES, V10, P819 PEREZMARTINEZ X, 2001, J BIOL CHEM, V276, P11302 WILSON RJM, 1996, J MOL BIOL, V261, P155 NR 9 TC 35 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD DEC 13 PY 2002 VL 298 IS 5601 BP 2155 EP 2155 PG 1 SC Multidisciplinary Sciences GA 624RA UT ISI:000179773700038 ER PT J AU Lopez-Callejas, R Valencia-Alvarado, R Munoz-Castro, AE Godoy-Cabrera, OG Tapia-Fabela, JL TI Instrumentation for plasma immersion ion implantation SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID OBJECTS; MODEL AB Plasma immersion ion implantation (PIII) has proved to be a good method to implant ions into materials in order to modify their surface properties. In this article, we describe the design and construction of a small and low cost PIII device. The instrumentation consists of: (i) a simple plasma immersion experimental setup for ion implantation based on direct current glow discharges, (ii) a 25 kV pulse generator, (iii) an electrical probe system endowed with a guard to carry out diagnostics of the plasma parameters, and (iv) an automatic spectroscopy system for determining the plasma temperature. A study of the sheath expansion has been considered in order to fulfill the requirements of electron temperature, plasma density, high voltage bias, pulse frequency, and pulse duration for an adequate PIII process. (C) 2002 American Institute of Physics. C1 Inst Nacl Invest Nucl, Fis Fis Plasmas, Mexico City 11801, DF, Mexico. Inst Tecnol Toluca, Dept Elect, Toluca, Mexico. Inst Tecnol & Estudios Super Monterrey, Mexico City 50252, DF, Mexico. RP Lopez-Callejas, R, Inst Nacl Invest Nucl, Fis Fis Plasmas, Apartado Postal 18-1027, Mexico City 11801, DF, Mexico. CR *H SEM, 1993, PREC WAV FORM GEN VO *HAM PHOT KK, 1990, PHOT TUB MAN *J YV OPT SPECTR, 1993, GUID SPECTR *MIN LAB INC, 1979, MIN MOD 305 SMP GAMM *US AT EN, 1955, 279 US AT EN COMM, P289 BALDWIN MJ, 1998, SURF COAT TECH, V98, P1187 BLAWERT C, 1997, SURF COAT TECH, V93, P274 BRENNING N, 1980, J PHYS D APPL PHYS, V13, P1459 CONRAD JR, 1987, J APPL PHYS, V62, P4591 CUNNINGHAM SP, C THERM REACT U CAL ENSINGER W, 1998, SURF COAT TECH, V103, P218 ENSINGER W, 2000, SURF COAT TECH, V128, P265 LECOEUR F, 2000, SURF COAT TECH, V125, P71 MANDL S, 1997, NUCL INSTRUM METH B, V127, P996 MUNSON CP, 1996, SURF COAT TECH, V84, P528 SCHEUER JT, 1990, J APPL PHYS, V67, P1241 STEWART RA, 1991, J APPL PHYS, V70, P3481 NR 17 TC 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTR JI Rev. Sci. Instrum. PD DEC PY 2002 VL 73 IS 12 BP 4277 EP 4282 PG 6 SC Physics, Applied; Instruments & Instrumentation GA 617ZY UT ISI:000179393200026 ER PT J AU Perea-Lopez, N Rakov, N Xiao, MF TI Current-heating formation of small holes in thin gold or silver films SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB We describe a process to form small holes in thin gold or silver films. The prepared films are useful for optical studies on surface plasmon induced transmission as well as some related phenomena. (C) 2002 American Institute of Physics. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Consensada, Ensenada 22800, Baja California, Mexico. UNAM, CCMC, San Ysidro, CA 92143 USA. RP Xiao, MF, Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Consensada, Apartado Postal 2681, Ensenada 22800, Baja California, Mexico. CR BETHE HA, 1944, PHYS REV, V66, P163 EBBESEN TW, 1998, NATURE, V391, P667 HIRASAWA M, 1997, J APPL PHYS, V82, P1404 LAMPRECHT B, 2000, PHYS REV LETT, V84, P4721 RAETHER H, 1988, SURFACE PLASMONS RITCHIE RH, 1968, PHYS REV LETT, V21, P1530 XIAO MF, 2001, J PHYS-CONDENS MAT, V13, P3001 XIAO MF, 2002, MATER LETT, V52, P301 NR 8 TC 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTR JI Rev. Sci. Instrum. PD DEC PY 2002 VL 73 IS 12 BP 4399 EP 4401 PG 3 SC Physics, Applied; Instruments & Instrumentation GA 617ZY UT ISI:000179393200046 ER PT J AU Trakhtenberg, LI Gerasimov, GN Aleksandrova, LN Potapov, VK TI Photo and radiation cryochemical synthesis of metal-polymer films: structure, sensor and catalytic properties SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article DE cryochemical solid-state synthesis; metal-polymer films; nanocrystals ID PARTICLES AB The novel radiation and photo-induced cryochemical solid-state synthesis of metal-polymer materials as well as the structure and physico-chemical properties of synthesized materials were described. The synthesis consists of low-temperature co-condensation of metal and monomer vapors followed by low-temperature solid-state polymerization of the co-condensate under irradiation. Depending on metal nature and monomer structure, this process allows to prepare specific metal-polymer systems: polymers containing organometallic units in polymer chains, metal-polymer complexes or stable metal clusters of various sizes trapped physically inside polymer matrix without coordination bonds between metal and polymer. The thermal treatment of synthesized systems leads to the formation of novel nanocomposite metal-polymer materials characterized by specific electric sensor and magnetic properties, catalytic activity and dielectric anomalies, which are discussed in relation to material structure. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Karpov Inst Phys Chem, State Sci Ctr Rus Fed, Moscow 103064, Russia. Univ Nacl Autonoma Mexico, Inst Invest Mat, Dept Polymeros, Mexico City 04510, DF, Mexico. RP Trakhtenberg, LI, Karpov Inst Phys Chem, State Sci Ctr Rus Fed, 10 Vorontsovo Pole, Moscow 103064, Russia. CR ALEXANDROVA L, 2001, POLYMER, V42, P273 ALEXANDROVA LN, 1993, POLIMEX93 INT S POLY, P150 ALEXANDROVA LN, 1993, POLYM SCI A, V35, P361 CHARLE KP, 1984, BER BUNSEN PHYS CHEM, V88, P350 CIARDELLI F, 1996, MACROMOLECULE METAL, P318 GERASIMOV GN, 1980, RADIAT PHYS CHEM, V15, P405 GERASIMOV GN, 1984, CHEM PHYS REP, V3, P176 GERASIMOV GN, 1996, MACROMOL CHEM PHYSIC, V197, P1387 GERASIMOV GN, 1998, CHEM PHYS REP, V17, P168 MANSUETO ES, 1989, J AM CHEM SOC, V111, P1900 NAGAEV EL, 1992, USP FIZ NAUK, V162, P49 NIKOLAEVA EV, 1999, MAT SCI ENG C-BIO S, V8, P217 POMOGAILO AD, 2000, NANOPARTICLES METALS, P673 SERGEEV G, 1995, J MATER CHEM, V5, P31 TRAKHTENBERG LI, 1996, P 2 INT C LOW TEMP C, P211 TRAKHTENBERG LI, 1999, RUSS J PHYS CHEM, V73, P209 TRAKHTENBERG LI, 1999, SCI ISR TECHNOL ADV, V1, P34 TRAKHTENBERG LI, 2000, STUDIES SURFACE SCI, V130, P941 VORONTSOV PS, 1998, RUSS J PHYS CHEM, V72, P1742 NR 19 TC 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0969-806X J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD NOV PY 2002 VL 65 IS 4-5 BP 479 EP 485 PG 7 SC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Nuclear Science & Technology GA 618NB UT ISI:000179423200024 ER PT J AU Varela, E Masso, F Paez, A Zenteno, R Zenteno, E Montano, LF TI Isolation of a 19-kDa mycobacterium, bovis-specific antigen, different from MPB70/80, by chromatofocusing SO PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY LA English DT Article ID LECTIN-AFFINITY-CHROMATOGRAPHY; CULTURE FILTRATE; INTERFERON-GAMMA; PROTEIN ANTIGENS; MPB83 PROTEINS; TUBERCULOSIS; BCG; PURIFICATION; REACTIVITY; SECRETION AB Two antigens, 19-kDa each, were purified from Mycobacterium bovis culture filtrate protein extract by chromatofocusing. Antigen I had a 4.5pI, and its amino terminal (DPVDAVINTTCNYGQVVAALNATDP) showed a 100% homology with the hypothetical protein Rv 1174c. Antigen II had a pI of 6.0 pI and its amino terminal (GDLVGPG-CAEYAAANP TGPASVQGM) showed a 100% homology with M. bovis MPB70/80. Antigen I is a hetero-dimer formed by a glycosylated, 10.5-kDa, monomer and a non-glycosylated 8-kDa monomer with identical amino terminal sequences. Both antigens were recognized by the sera of PPD+ animals, but antigen I did not crossreact with sera of human PPD+ individuals. Antigen I was a weak inducer of lymphocyte proliferation and IFN-gamma production. Our results show that M. bovis expresses a 19kDa glycoprotein, homologue to the product of M. tuberculosis gen Rv-1174c, which may prove useful for bovine TB diagnostic assays. C1 Inst Nacl Cardiol Ignacio Chavez, Dept Biol Celular, Tlalpan 14080, Mexico. Inst Nacl Enfermedades, Dept Bioquim, Tlalpan 14080, Mexico. RP Montano, LF, Inst Nacl Cardiol Ignacio Chavez, Dept Biol Celular, Juan Badiano 1, Tlalpan 14080, Mexico. CR APPELBERG R, 1994, IMMUNOBIOLOGY, V191, P520 BHASKAR S, 2000, VACCINE, V18, P2856 COLE ST, 1998, NATURE, V393, P537 COLER RN, 1998, J IMMUNOL, V161, P2356 DEKANTOR IN, 1994, VET MICROBIOL, V40, P5 DIAZ F, 1999, VET IMMUNOL IMMUNOP, V67, P203 FIFIS T, 1991, INFECT IMMUN, V59, P800 FIFIS T, 1992, VET MICROBIOL, V30, P343 HARBOE M, 1986, INFECT IMMUN, V52, P293 HARBOE M, 1995, SCAND J IMMUNOL, V42, P46 MASSO F, 1993, REV LAT MICROBIOL, V35, P177 MASSO F, 1998, GLYCOCONJUGATE J, V15, P843 MIURA K, 1983, INFECT IMMUN, V39, P540 MONTANO LF, 1994, COMP BIOCHEM PHYS B, V108, P265 ROTHEL JS, 1990, AUST VET J, V67, P134 SANCHEZ L, 1994, LEETINS BIOL BIOCH C, V10, P94 SUGDEN EA, 1996, CLIN DIAGN LAB IMMUN, V3, P541 TERASAKA K, 1989, FEMS MICROBIOL LETT, V49, P273 ULSTRUP JC, 1995, INFECT IMMUN, V63, P672 URQUHART BL, 1997, ELECTROPHORESIS, V18, P1384 WANG CQ, 1996, BIOCHEMISTRY-US, V35, P7299 WELDINGH K, 1998, INFECT IMMUN, V66, P3492 WIKER HG, 1998, INFECT IMMUN, V66, P1445 YOUNG DB, 1992, MOL MICROBIOL, V6, P133 NR 24 TC 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 USA SN 1082-6068 J9 PREP BIOCHEM BIOTECHNOL JI Prep. Biochem. Biotechnol. PY 2002 VL 32 IS 4 BP 329 EP 340 PG 12 SC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 618KY UT ISI:000179418300002 ER PT J AU Cheng, WH Endo, A Zhou, L Penney, J Chen, HC Arroyo, A Leon, P Nambara, E Asami, T Seo, M Koshiba, T Sheen, J TI A unique short-chain dehydrogenase/reductase in Arabidopsis glucose signaling and abscisic acid biosynthesis and functions SO PLANT CELL LA English DT Article ID GENE-EXPRESSION; 9-CIS-EPOXYCAROTENOID DIOXYGENASE; ALDEHYDE OXIDASE; ZEAXANTHIN EPOXIDASE; DEVELOPMENTAL ARREST; INSENSITIVE MUTANTS; HIGHER-PLANTS; WATER-STRESS; SDR ENZYMES; ETHYLENE AB Glc has hormone-like functions and controls many vital processes through mostly unknown mechanisms in plants. We report here on the molecular cloning of GLUCOSE INSENSITIVE1 (GIN1) and ABSCISIC ACID DEFICIENT2 (ABA2) which encodes a unique Arabidopsis short-chain dehydrogenase/reductase (SDR1) that functions as a molecular link between nutrient signaling and plant hormone biosynthesis. SDR1 is related to SDR superfamily members involved in retinoid and steroid hormone biosynthesis in mammals and sex determination in maize. Glc antagonizes ethylene signaling by activating ABA2/GIN1 and other abscisic acid (ABA) biosynthesis and signaling genes, which requires Glc and ABA synergistically. Analyses of aba2/gin1 null mutants define dual functions of endogenous ABA in inhibiting the post-germination developmental switch modulated by distinct Glc and osmotic signals and in promoting organ and body size and fertility in the absence of severe stress. SDR1 is sufficient for the multistep conversion of plastid- and carotenoid-derived xanthoxin to abscisic aldehyde in the cytosol. The surprisingly restricted spatial and temporal expression of SDR1 suggests the dynamic mobilization of ABA precursors and/or ABA. C1 Harvard Univ, Sch Med, Dept Genet, Boston, MA 02114 USA. Massachusetts Gen Hosp, Dept Mol Biol, Boston, MA 02114 USA. Acad Sinica, Inst Bot, Taipei 11529, Taiwan. Tokyo Metropolitan Univ, Dept Biol Sci, Hachioji, Tokyo 1920397, Japan. Univ Nacl Autonoma Mexico, Inst Biotechnol, Dept Biol Mol Plantas, Cuernavaca 62271, Morelos, Mexico. RIKEN, Inst Phys & Chem Res, Plant Sci Ctr, Wako, Saitama 3510198, Japan. RIKEN, Inst Phys & Chem Res, Plant Funct Lab, Wako, Saitama 3510198, Japan. RP Sheen, J, Harvard Univ, Sch Med, Dept Genet, Boston, MA 02114 USA. 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Using already existing experimental data, we can put bounds on these effects that are more stringent by several orders of magnitude than those expected to be obtained in astrophysical observations. In fact, these results can already be interpreted as questioning the whole scenario of linear (in l(P)) corrections to the dispersion relations for free fields in Lorentz violating theories. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico. Natl Univ La Plata, Dept Fis, RA-1900 La Plata, Argentina. RP Sudarsky, D, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, A Postal 70-543, Mexico City 04510, DF, Mexico. 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Rev. Lett. PD DEC 2 PY 2002 VL 89 IS 23 AR 231301 DI ARTN 231301 PG 4 SC Physics, Multidisciplinary GA 617LG UT ISI:000179362700007 ER PT J AU Froufe-Perez, LS Garcia-Mochales, P Serena, PA Mello, PA Saenz, JJ TI Conductance distributions in quasi-one-dimensional disordered wires SO PHYSICAL REVIEW LETTERS LA English DT Article ID RANDOM-MATRIX THEORY; TRANSMISSION EIGENVALUES; QUANTUM-TRANSPORT; WAVE-GUIDES; ANDERSON TRANSITION; LEVEL STATISTICS; MOBILITY EDGE; LOCALIZATION; SURFACE; FLUCTUATIONS AB A detailed analysis of the distribution of conductances P(g) of quasi-one-dimensional disordered wires in the metal-insulator crossover is presented. P(g) obtained from a Monte Carlo solution of the Dorokhov, Mello, Pereyra, and Kumar (DMPK) scaling equation is in full agreement with "tight-binding" numerical calculations of bulk disordered wires. Perturbation theory is shown to be valid even for mean dimensionless conductances [g] of the order of 1. In the crossover regime [g] less than or similar to 1, P(g) presents a sharp feature at g = 1 which is different from that observed in surface disordered wires. C1 Univ Autonoma Madrid, Dept Fis Mat Condensada, E-28049 Madrid, Spain. Univ Autonoma Madrid, Inst Nicolas Cabrera, E-28049 Madrid, Spain. CSIC, Ctr Nacl Microelect, Inst Microelect Madrid, E-28760 Madrid, Spain. CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. RP Froufe-Perez, LS, Univ Autonoma Madrid, Dept Fis Mat Condensada, Cantoblanco, E-28049 Madrid, Spain. 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Rev. Lett. PD DEC 9 PY 2002 VL 89 IS 24 AR 246403 DI ARTN 246403 PG 4 SC Physics, Multidisciplinary GA 619PG UT ISI:000179484700036 ER PT J AU Dong, SS Dong, SH TI Schrodinger equation with a Coulomb field in 2+1 dimensions SO PHYSICA SCRIPTA LA English DT Article ID HYDROGEN-ATOM AB The solutions of the two-dimensional Schrodinger equation with a Coulomb potential are briefly studied and compared with those of the Klein-Gordon case studied in this work. The eigenvalues and the normalized eigenfunctions are analytically obtained. The fine structure of the energy level for this system is also discussed. C1 Dalian Univ Technol, Ctr Comp, Dalian 116622, Peoples R China. UNAM, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RP Dong, SS, Dalian Univ Technol, Ctr Comp, Dalian 116622, Peoples R China. 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PD NOV PY 2002 VL 66 IS 5 BP 342 EP 344 PG 3 SC Physics, Multidisciplinary GA 619FP UT ISI:000179465400002 ER PT J AU Vlachy, V Hribar, B Pizio, O TI Replica integral equation theory for partly quenched electrolyte mixtures SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article DE electrolytes; randomly disordered solids; chemical potential; replica Ornstein-Zemike integral equation ID ORNSTEIN-ZERNIKE EQUATIONS; ION-ION CORRELATIONS; ELECTRONEUTRAL CHARGED MATRICES; RANDOM-MEDIA; FLUID DISTRIBUTIONS; DISORDERED MATRICES; ARBITRARY MATRICES; THERMODYNAMICS; EQUILIBRIUM; PREDICTIONS AB We present a theoretical study of the quenched-annealed system consisting of an annealed electrolyte and a disordered quenched matrix with ionic obstacles. Both components were modeled as size symmetric +1 : - 1 primitive model electrolytes. The partly quenched system was studied by using the replica Omstein-Zernike, integral equation theory in the hypernetted chain approximation. The effects of concentration of matrix ions, pre-quenching conditions, and the electrolyte and solvent conditions on the excess chemical potential of the annealed electrolyte were examined. The numerical results indicated that the mean activity of the adsorbed electrolyte differs substantially from the corresponding quantity for the bulk electrolyte. The excess chemical potential depends strongly on concentration of charged obstacles and matrix preparation, as also on the temperature and dielectric constant of the annealed electrolyte solution. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Ljubljana, Dept Chem & Chem Technol, Ljubljana 1000, Slovenia. Natl Autonomous Univ Mexico, Inst Quim, Mexico City 04510, DF, Mexico. RP Vlachy, V, Univ Ljubljana, Dept Chem & Chem Technol, Askerceva 5, Ljubljana 1000, Slovenia. CR BRATKO D, 1995, PHYS REV E A, V51, P5805 BRATKO D, 1996, J CHEM PHYS, V104, P7700 CHAKRABORTY AK, 1994, J CHEM PHYS, V100, P1528 DEEM MW, 1994, J STAT PHYS, V76, P907 GIVEN JA, 1992, J CHEM PHYS, V97, P4573 GIVEN JA, 1994, PHYSICA A, V209, P495 HRIBAR B, 1997, J CHEM PHYS, V107, P6335 HRIBAR B, 1998, J CHEM PHYS, V109, P2480 HRIBAR B, 1999, J PHYS CHEM B, V103, P5361 HRIBAR B, 2000, J PHYS CHEM B, V104, P4479 HRIBAR B, 2001, J PHYS CHEM B, V105, P4727 KAMINSKY RD, 1991, J CHEM PHYS, V95, P2936 KIERLIK E, 1997, J CHEM PHYS, V106, P264 MADDEN WG, 1988, J STAT PHYS, V51, P537 MADDEN WG, 1992, J CHEM PHYS, V96, P5422 PIZIO O, 1998, J PHYS STUD, V2, P296 PIZIO O, 2000, COMPUTATIONAL METHOD ROSINBERG ML, 1994, J CHEM PHYS, V100, P5172 ROSINBERG ML, 1999, NEW APPROACHES PROBL TATLIPINAR H, 1993, PHIL MAG LETT, V68, P357 NR 20 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 1 PY 2002 VL 314 IS 1-4 BP 156 EP 161 PG 6 SC Physics, Multidisciplinary GA 619XL UT ISI:000179502800023 ER PT J AU Gonzalez, AE Martinez-Lopez, F Moncho-Jorda, A Hidalgo-Alvarez, R TI Concentration effects on two- and three-dimensional colloidal aggregation SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article DE colloidal aggregation; fractal dimension; kinetic exponents; concentration dependence ID SIMULATIONS; CLUSTERS AB By means of extensive numerical simulations of diffusion-limited colloidal aggregation in two and three dimensions, we have found the concentration dependence of the structural and dynamical quantities. Both on- and off-lattice simulations were used in 2D to check the independence of our results on the simulational algorithms and on the space structure. The range in concentration studied spanned two-and-a-half orders of magnitude, in both dimensionalities. In two dimensions, it was found that the cluster fractal dimension difference from the zero-concentration value shows a linear increase with the concentration, while this increase is of a square root type for the three-dimensional case. For the exponent z, defining the increase of the weight-average cluster size as a function of time, the difference from the zero-concentration value in three dimensions is again of a square root type increase with concentration, while in two dimensions this increase goes as the 0.6 power of the concentration. We give arguments for the drastic change in the power laws for the case of the fractal dimension, when going from two to three dimensions, and for the small change for the case of the kinetic exponent z. We also present the master curves for the scaling of the cluster size distribution and their dependence on concentration, in both dimensionalities. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Cuernavaca 62251, Morelos, Mexico. Univ Granada, Dept Fis Aplicada, Grp FIs Fluidos & Biocoloides, E-18071 Granada, Spain. RP Gonzalez, AE, Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Apartado Postal 48-3, Cuernavaca 62251, Morelos, Mexico. CR BROIDE ML, 1990, PHYS REV LETT, V64, P2026 BROIDE ML, 1992, J COLLOID INTERF SCI, V153, P493 GONZALEZ AE, 1993, PHYS REV LETT, V71, P2248 GONZALEZ AE, 1995, PHYS REV LETT, V74, P1238 GONZALEZ AE, 2002, J COLLOID INTERF SCI, V246, P227 KOLB M, 1983, PHYS REV LETT, V51, P1123 MEAKIN P, 1983, PHYS REV LETT, V51, P1119 MONCHOJORDA A, 2000, PHYSICA A, V282, P50 NR 8 TC 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 1 PY 2002 VL 314 IS 1-4 BP 235 EP 245 PG 11 SC Physics, Multidisciplinary GA 619XL UT ISI:000179502800034 ER PT J AU Robledo, A TI The renormalization group and optimization of non-extensive entropy: criticality in non-linear one-dimensional maps SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article DE nonlinear maps; period doubling; intermittency; renormalization group; entropy; non-extensivity ID POWER-LAW SENSITIVITY; INITIAL CONDITIONS; NONEXTENSIVITY; FRACTALITY AB We examine the pitchfork and tangent bifurcations in unimodal maps to illustrate a connection between renormalization group (RG) fixed points and entropy extremal properties. We observe that the exact RG solution for the tangent bifurcation is also applicable to the period-doubling cascade and assess its physical meaning. Since the expression for the fixed-point map can be put into the form of the non-extensive expressions for the temporal evolution of phase-space volume and sensitivity of initial conditions, we conclude that the map critical points possess the properties of this formalism. The universality of the RG solution makes this interpretation inclusive to all one-dimensional maps of non-linearity z > 1. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. RP Robledo, A, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR ANANIA G, 1988, EUROPHYS LETT, V7, P119 BUIATTI M, 1999, PHYS REV LETT, V82, P3383 COSTA UMS, 1997, PHYS REV E A, V56, P245 DEMOURA FABF, 2000, PHYS REV E A, V62, P6361 GASPARD P, 1988, P NATL ACAD SCI USA, V85, P4591 GRASSBERGER P, 1981, J STAT PHYS, V26, P697 HATA H, 1989, PROG THEOR PHYS, V82, P897 HU B, 1982, PHYS REV LETT, V48, P1645 LYRA ML, 1998, PHYS REV LETT, V80, P53 ROBLEDO A, 1999, PHYS REV LETT, V83, P2289 SCHNEIDER T, 1987, Z PHYS B CON MAT, V66, P469 SCHUSTER HG, 1988, DETERMINISTIC CHAOS TSALLIS C, 1988, J STAT PHYS, V52, P479 TSALLIS C, 1997, CHAOS SOLITON FRACT, V8, P885 TSALLIS C, 2001, LECT NOTE PHYS, V560, P3 NR 15 TC 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD NOV 1 PY 2002 VL 314 IS 1-4 BP 437 EP 441 PG 5 SC Physics, Multidisciplinary GA 619XL UT ISI:000179502800059 ER PT J AU Orozco-Covarrubias, L Soriano-Hernandez, Y Duran-McKinster, C Tamayo-Sanchez, L Ruiz-Maldonaldo, R TI Infantile myofibromatosis: A cause of leg length discrepancy SO PEDIATRIC DERMATOLOGY LA English DT Article ID HEMANGIOPERICYTOMA AB An infant with self-healing, multifocal cutaneous infantile myofibromatosis with leg-length discrepancy as a sequela is reported. This condition should be suspected in infants with one or more firm or hard nodules in the skin, subcutaneous tissue, bone, muscle, or viscera. The histopathologic picture is diagnostic. Treatment and prognosis depend on the extension and location of the tumors. C1 Natl Inst Pediat, Dept Dermatol, Mexico City 04530, DF, Mexico. RP Orozco-Covarrubias, L, Natl Inst Pediat, Dept Dermatol, Insurgentes Sur 3700 C, Mexico City 04530, DF, Mexico. CR BAIRD PA, 1976, CLIN GENET, V9, P488 BELLMAN B, 1991, PEDIATR DERMATOL, V8, P306 BRACKO M, 1992, CANCER, V69, P1294 CARDIA E, 1993, CHILD NERV SYST, V9, P246 COFFIN CM, 1991, PEDIATR PATHOL, V11, P569 COFFIN CM, 1995, PEDIATR PATHOL LAB M, V15, P571 FISHER C, 1996, EUR J CANCER A, V32, P2094 FUKASAWA Y, 1994, AM J PATHOL, V144, P480 JENNINGS TA, 1984, AM J SURG PATHOL, V8, P529 MENTZEL T, 1994, AM J SURG PATHOL, V18, P922 PARKER RK, 1991, PEDIATR DERMATOL, V8, P129 VARIEND S, 1995, HISTOPATHOLOGY, V26, P57 WISWELL TE, 1985, PEDIATRICS, V76, P981 NR 13 TC 0 PU BLACKWELL PUBLISHING INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0736-8046 J9 PEDIAT DERMATOL JI Pediatr. Dermatol. PD NOV-DEC PY 2002 VL 19 IS 6 BP 520 EP 522 PG 3 SC Dermatology; Pediatrics GA 618HM UT ISI:000179412700011 ER PT J AU Amozorrutia-Alegria, V Bravo-Ortiz, JC Vazquez-Vivero, J Campos-Campos, L Mejia-Arangure, M Juarez-Ocana, S Martinez-Garcia, MD Fajardo-Gutierrez, A TI Epidemiological characteristics of retinoblastoma in children attending the Mexican Social Security Institute in Mexico City, 1990-94 SO PAEDIATRIC AND PERINATAL EPIDEMIOLOGY LA English DT Article ID CHILDHOOD-CANCER AB The object of this study is to present descriptive epidemiological characteristics of retinoblastoma (Rb) in children aged 0-14 years, seen at the Mexican Social Security Institute hospitals in Mexico City (MC) from 1990 to 1994. This is a retrospective, observational hospital survey. Clinical records of 52 Rb cases were reviewed; 39 were patients who did not reside in MC (non-residents), and 13 were MC residents. The study period was 1990-94. The male/female ratio (M/F) was 1.6. Average annual incidence (AAI) was estimated by age and sex (rates per 1 000000). Annual average percentage change (AAPC) in incidence rates was estimated in children from 0 to 14 years. The AAI for MC residents was 3.2; the highest rate being for those <1 year olds (rate of 20.8); AAPC was 6.9% [95% CI-27.5, 57.4]; the highest incidence was for the southeastern region of MC residents (rate of 5.9); 13 cases (25%) were diagnosed at stage III or IV, and 11 cases (21.2%) were bilateral. Incidence of Rb is similar to that in developed countries and shows no increasing trend. Patients from communities outside MC are more frequently diagnosed at stages III and IV. C1 Inst Mexicano Seguro Social, Unidad Invest Med Epidemiol Clin, Hosp Pediat,Clin Epidemiol Med Res Unit, Ctr Med Nacl Siglo XXI, Mexico City 06720, DF, Mexico. Inst Mexicano Seguro Social, Reg Gen Hosp 24, Mexico City 06720, DF, Mexico. Inst Mexicano Seguro Social, Dept Ophthalmol, Ctr Med Nacl La Raza, Gen Hosp, Mexico City 06720, DF, Mexico. RP Fajardo-Gutierrez, A, Inst Mexicano Seguro Social, Unidad Invest Med Epidemiol Clin, Hosp Pediat,Clin Epidemiol Med Res Unit, Ctr Med Nacl Siglo XXI, Ave Cuauhtemoc 330, Mexico City 06720, DF, Mexico. CR *COORD AT MED, 1995, CENS POBL ADSCR MED ABRAMSON DH, 1985, J PEDIATR OPHTHALMOL, V22, P246 ABRAMSON DH, 1986, J PEDIATR OPHTHALMOL, V23, P174 BERNARD JL, 1993, EUR J CANCER, V29, P2284 BRAVOORTIZ JC, 1996, B MED HOSP INFANT M, V53, P234 DELATORRECASTRO RE, 1995, REV MEXICANA OFTALMO, V69, P69 DONALDSON SS, 1997, PRINCIPLES PRACTICE, P699 ELLSWORTH RM, 1991, CLIN OPHTHALMOLOGY D, P1 ESTEVE J, 1994, IARC PUBLICATION, V128, P107 FAJARDOGUTIERRE.A, 1996, B MED HOSP INFANT M, V53, P57 FAJARDOGUTIERREZ A, 1997, MED PEDIATR ONCOL, V29, P208 GOMEZMARTINEZ R, 1995, GACETA MED MEXICO, V131, P527 KRAMAROVA E, 1996, INT J CANCER, V68, P759 MILLER RW, 1995, CANCER, V75, P395 PARKIN DM, 1998, IARC SCI PUBLICATION, V144 RIVERALUNA R, 1995, REV I NACL CANCEROLO, V41, P9 SALASMARTINEZ M, 1988, NEOPLASIAS MALIGNAS, P12 SALAZARFLORES M, 1986, B MED HOSP INFANT M, V43, P106 SCHULTZ KR, 1993, CANCER, V72, P282 SMITH PG, 1992, IARC SCI PUBL, V120, P865 TAMBOLI A, 1990, ARCH OPHTHALMOL-CHIC, V108, P128 NR 21 TC 2 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0269-5022 J9 PAEDIATR PERINAT EPIDEMIOL JI Paediatr. Perinat. Epidemiol. PD OCT PY 2002 VL 16 IS 4 BP 370 EP 374 PG 5 SC Public, Environmental & Occupational Health; Public, Environmental & Occupational Health; Obstetrics & Gynecology; Pediatrics GA 618HX UT ISI:000179413600013 ER PT J AU Navarrete-Bolanos, JL Jimenez-Islas, H Botello-Alvarez, E Rico-Martinez, R TI Application of the response surface methodology for the design of a lixiviation process SO ORGANIC PROCESS RESEARCH & DEVELOPMENT LA English DT Article ID OPTIMIZATION; CAROTENOIDS; CULTURE AB The design of many separation processes is often hindered by the lack of distribution data between two immiscible phases. Inappropriate or partial designs result in inefficiencies that translate into poor recovery of the products, overdesigned separation equipment, or additional purification and separation stages. In recent years, statistically based experimental design has been successfully used to quantify relevant factors in many biological and chemical processes. In this study, we illustrate the capabilities of one of these approaches, the response surface methodology (RSM) for the optimization of lixiviation processes of marigold flower flour for xanthophyll extraction. (oleoresin) using hexime. The method leads to conditions for the maximum recovery of the pigment, allowing the determination of the optimal residence time (14.7 min) and flour-to-solvent ratio (1: 5) at 35 degreesC. These values can he used in the lixiviation process in any operation mode. In this study, we illustrate the use of a countercurrent process that allows recovery of 97.5% of the oleoresin. C1 Inst Tecnol Celaya, Dept Ingn Quim & Bioquim, Celaya 38010, Gto, Mexico. Univ Autonoma Queretaro, Dept Invest & Posgrad Alimentos PROPAC, Queretaro 76010, Mexico. RP Navarrete-Bolanos, JL, Inst Tecnol Celaya, Dept Ingn Quim & Bioquim, Av Tecnol S-N, Celaya 38010, Gto, Mexico. CR *AOAC, 1984, OFF METH AN BRITTON G, 1991, METHODS PLANT BIOCH, V7, P473 CRAFT NE, 1992, J AGR FOOD CHEM, V40, P431 DONA OJ, 1997, GOVT REPORTS ANNOUNC ELHALOUAT A, 1997, INT J FOOD MICROBIOL, V35, P41 ELMASRI HA, 1997, CRIT REV TOXICOL, V27, P175 GEANKOPLIS CJ, 1993, PROCESS TRANSPORT UN HARKER M, 1995, J APPL PHYCOL, V7, P399 MONTGOMERY DC, 1997, DESIGN ANAL EXPT NAVARRETEBOLANOS JL, 2001, J FOOD SCI, V66, P1143 OOIJKAAS LP, 1999, BIOTECHNOL BIOENG, V64, P92 PARK JW, 1996, J FOOD SCI, V61, P766 PHILIP T, 1975, J FOOD SCI, V41, P163 QUACKENBUSH FW, 1972, J ASSOC OFF ANA CHEM, V55, P617 SAVAL S, 1993, BIORESOURCE TECHNOL, V43, P19 SEDDON JM, 1994, JAMA-J AM MED ASSOC, V272, P1413 SMITH NK, 1997, ENZYME MICROB TECH, V21, P349 TAYLOR RF, 1996, INT C S NAT COL AC M TREYBAL RE, 1987, MASS TRANSFER OPERAT VAZQUEZ M, 1998, BIOTECHNOL BIOENG, V57, P314 NR 20 TC 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1083-6160 J9 ORG PROCESS RES DEV JI Org. Process Res. Dev. PD NOV-DEC PY 2002 VL 6 IS 6 BP 841 EP 846 PG 6 SC Chemistry, Medicinal; Chemistry, Organic GA 618BA UT ISI:000179396300019 ER PT J AU Chaparro-Huerta, V Rivera-Cervantes, MC Torres-Mendoza, BM Beas-Zarate, C TI Neuronal death and tumor necrosis factor-alpha response to glutamate-induced excitotoxicity in the cerebral cortex of neonatal rats SO NEUROSCIENCE LETTERS LA English DT Article DE cell death; tumor necrosis factor-alpha; neuroexcitotoxicity; glutamate; neonatal rats ID CENTRAL-NERVOUS-SYSTEM; CORTICAL-NEURONS; CELL-DEATH; APOPTOSIS; MICROGLIA; NEUROPROTECTION; MECHANISMS; CULTURE; INJURY AB Neuronal death and lactate dehydrogenase (LDH) activity were evaluated in the cerebral cortices of neonatal rats after exposure to monosodium L-glutamate (MSG) to induce neuroexcitotoxicity. A time-response profile for tumor necrosis factor-alpha (TNF-alpha) expression was drawn, with measurements taken every 6 h after the first dose of MSG during the first 8 postnatal days, and at days 10 and 14 after birth. An increase in neuronal loss accompanied by high LDH activity and high TNF-alpha levels was observed at 8 and 10 days. These results indicate that neuronal loss may occur via an apoptosis-like mechanism directed selectively against neurons that express glutamate receptors, mainly the N-methyl-D-aspartate, which it may be strengthen by high TNF-a levels through a feedback mechanism to induce cell death via apoptosis. (C) 2002 Published by Elsevier Science Ireland Ltd. C1 IMSS, CIBO, Div Neurociencias, Lab Neurobiol Celular & Mol, Guadalajara 44421, Jalisco, Mexico. Univ Guadalajara, CUCBA, Dept Biol Celular & Mol, Guanajuato, Mexico. IMSS, CIBO, Div Inmunol, Guadalajara, Mexico. RP Beas-Zarate, C, IMSS, CIBO, Div Neurociencias, Lab Neurobiol Celular & Mol, PO 4-160, Guadalajara 44421, Jalisco, Mexico. CR ANKARCRONA M, 1995, NEURON, V15, P961 BANATI RB, 1993, GLIA, V7, P111 BAUD V, 2001, TRENDS CELL BIOL, V11, P372 BECHER B, 2000, GLIA, V29, P293 BRONSTEIN DM, 1995, BRAIN RES, V704, P112 CHEUNG NS, 1998, NEUROPHARMACOLOGY, V37, P1419 CHOI DW, 1992, J NEUROBIOL, V23, P1261 CLARKE PGH, 1990, ANAT EMBRYOL, V181, P195 GLAZNER GW, 2000, J NEUROSCI, V20, P3641 GONZALEZSCARANO F, 1999, ANNU REV NEUROSCI, V22, P219 HARTLEY DM, 1989, J PHARMACOL EXP THER, V250, P752 HIRASHIMA Y, 1999, BRAIN RES, V849, P109 JENSEN JB, 1998, NEUROCHEM INT, V32, P505 JIANG Q, 2000, BRAIN RES, V887, P285 KOBAYASHI T, 1998, EUR J PHARMACOL, V363, P1 MARTIN LJ, 1998, BRAIN RES BULL, V46, P281 MARTINEZCONTRERAS A, 2002, J NEUROSCI RES, V67, P200 MATTSON MP, 2000, NAT REV MOL CELL BIO, V1, P120 OZAWA S, 1998, PROG NEUROBIOL, V54, P581 SARASTE A, 2000, CARDIOVASC RES, V45, P528 SAWADA M, 1989, BRAIN RES, V491, P394 SZELENYI J, 2001, BRAIN RES BULL, V54, P329 VANEDEN CG, 1990, PROG BRAIN RES, V85, P169 WONG PC, 1998, CURR OPIN NEUROBIOL, V8, P791 NR 24 TC 5 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3940 J9 NEUROSCI LETT JI Neurosci. Lett. PD NOV 22 PY 2002 VL 333 IS 2 BP 95 EP 98 PG 4 SC Neurosciences GA 618RL UT ISI:000179431000005 ER PT J AU Quintero, V Cevallos, MA Davila, G TI A site-specific recombinase (RinQ) is required to exert incompatibility towards the symbiotic plasmid of Rhizobium etli SO MOLECULAR MICROBIOLOGY LA English DT Article ID COMPLETE NUCLEOTIDE-SEQUENCE; REPABC-TYPE REPLICON; TUMOR-INDUCING TI; AGROBACTERIUM-TUMEFACIENS; HOST-RANGE; MULTICOPY PLASMID; GAMMA-DELTA; SYM PLASMID; RES-SITES; LEGUMINOSARUM AB The replication/partition region of the symbiotic plasmid p42d of Rhizobium etli CE3 is characterized by the presence of the repABC operon. A recombinant plasmid containing this region is able to replicate in a R. etli derivative cured from p42d, with the same stability and copy number shown by the parental plasmid. However, when this construct is introduced into the wild-type strain, instead of exerting incompatibility against the p42d, it forms a stable cointegrate with it. In this paper, we show that a site-specific resolvase, and its action sites are essential factors to displace the symbiotic p42d. We propose a model for this novel incompatibility mechanism. C1 Univ Nacl Autonoma Mexico, Ctr Invest Fijac Nitrogeno, Programa Evoluc Mol, Cuernavaca 62210, Morelos, Mexico. RP Davila, G, Univ Nacl Autonoma Mexico, Ctr Invest Fijac Nitrogeno, Programa Evoluc Mol, Cuernavaca 62210, Morelos, Mexico. CR ALTSCHUL SF, 1997, NUCLEIC ACIDS RES, V25, P3389 AUSTIN S, 1981, CELL, V25, P729 BARTOSIK D, 1998, MICROBIOL-UK 11, V144, P3149 BARTOSIK D, 2001, J BACTERIOL, V183, P6234 BEYNON JL, 1980, J GEN MICROBIOL, V120, P421 BREWIN NJ, 1980, J GEN MICROBIOL, V120, P413 EBERL L, 1994, MOL MICROBIOL, V12, P131 FREIBERG C, 1997, NATURE, V387, P394 GALIBERT F, 2001, SCIENCE, V293, P668 GARNIER T, 1987, MOL MICROBIOL, V1, P371 GERLITZ M, 1990, J BACTERIOL, V172, P6194 GIRARD ML, 1991, J BACTERIOL, V165, P723 GOODNER B, 2001, SCIENCE, V294, P2323 GORDON D, 1998, GENOME RES, V8, P195 GRINDLEY NDF, 1982, CELL, V30, P19 HAKKAART MJJ, 1984, CELL, V36, P203 HANAHAN D, 1983, J MOL BIOL, V166, P407 HATFULL GF, 1986, P NATL ACAD SCI USA, V83, P5429 HOOYKAAS PJJ, 1980, J BACTERIOL, V143, P1295 HOOYKAAS PJJ, 1985, PLASMID, V14, P47 HYNES MF, 1985, PLASMID, V13, P99 JOHNSTON AWB, 1982, J GEN MICROBIOL, V128, P85 KANEKO T, 2000, DNA RES, V7, P331 KOMANO T, 1999, ANNU REV GENET, V33, P171 MINAKHINA S, 1999, MOL MICROBIOL, V33, P1059 MORIGUCHI K, 2001, J MOL BIOL, V307, P771 NOEL KD, 1984, J BACTERIOL, V158, P148 NOVICK RP, 1976, BACTERIOL REV, V40, P168 NOVICK RP, 1987, MICROBIOL REV, V51, P381 OCONNELL MP, 1984, ADV NITROGEN FIXATIO, P713 OCONNELL MP, 1987, PLASMID, V18, P156 RAMIREZROMERO MA, 1997, MICROBIOL-SGM 8, V143, P2825 RAMIREZROMERO MA, 2000, J BACTERIOL, V182, P3117 RAMIREZROMERO MA, 2001, MOL MICROBIOL, V42, P195 REED RR, 1984, COLD SPRING HARB SYM, V49, P245 RIGOTTIERGOIS L, 1998, MICROBIOL-UK 3, V144, P771 ROSENBERG C, 1984, MOL GEN GENET, V196, P533 SALZBERG SL, 1998, NUCLEIC ACIDS RES, V26, P544 SAMBROOK J, 1989, MOL CLONING LAB MANU SELBITSCHKA W, 1993, APPL MICROBIOL BIOT, V38, P615 SIMON R, 1983, BIO-TECHNOL, V1, P784 SMITH MCM, 2002, MOL MICROBIOL, V44, P299 SUMMERS DK, 1984, CELL, V36, P1097 SUZUKI K, 2000, GENE, V242, P331 TABATA S, 1989, J BACTERIOL, V171, P1665 THORPE HM, 1998, P NATL ACAD SCI USA, V95, P5505 WHEATCROFT R, 1990, MOL PLANT MICROBE IN, V3, P9 NR 47 TC 3 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0950-382X J9 MOL MICROBIOL JI Mol. Microbiol. PD NOV PY 2002 VL 46 IS 4 BP 1023 EP 1032 PG 10 SC Biochemistry & Molecular Biology; Microbiology GA 618CQ UT ISI:000179400900010 ER PT J AU Nowakowski, M TI Quantum instability for mixed states SO MODERN PHYSICS LETTERS A LA English DT Article DE CP-violation; instability; neutral kaons ID CP-VIOLATION; NONCONSERVATION; INTERFERENCE; EVOLUTION; DECAYS; PAST; KAON AB The analysis of the time evolution of unstable states which are linear superposition of other, observable, states can, in principle, be carried out in two distinct, non-equivalent ways. One of the methods, usually employed for the neutral kaon system, combines the mixing and instability into one single step which then results in unconventional properties of the mass-eigenstates. An alternative method is to remain within the framework of a Lagrangian formalism and to perform the mixing prior to the instability analysis, Staying close to the K-0-(K) over bar (0) system, we compare both methods pointing out some of their shortcomings and advantages. C1 Univ Guanajuato, Inst Fis, Guanajuato, Mexico. Univ Los Andes, Dept Fis, Bogota, Colombia. RP Nowakowski, M, Univ Guanajuato, Inst Fis, Apdo Postal E-143, Guanajuato, Mexico. CR ALVAREZGAUME L, 1999, PHYS LETT B, V458, P347 ANCOCHEA B, 1995, PHYS LETT B, V347, P419 BELL JS, 1965, P INT C EL PART BEUTHE M, 1998, INT J MOD PHYS A, V13, P3587 BILENKY SM, 1987, REV MOD PHYS, V59, P671 CHIU CB, 1990, PHYS REV D, V42, P3712 CVETIC G, 1993, PHYS LETT B, V301, P77 DATTA A, 1987, PHYS LETT A, V123, P4 DATTA A, 1988, PHYS LETT A, V130, P187 FINKELSTEIN J, 1987, PHYS LETT A, V126, P159 KABIR PK, 1968, CP PUZZLE KABIR PK, 1996, PHYS REV A, V53, P66 KHALFIN LA, 1990, 211 CPT U TEX AUST KHALFIN LA, 1991, 246 CPT LEE TD, 1957, PHYS REV, V106, P340 LEE TD, 1981, PARTICLE PHYISICS IN MATHUR VS, 1991, MOD PHYS LETT A, V6, P2741 NOWAKOWSKI M, 1999, INT J MOD PHYS A, V14, P589 PILAFTSIS A, 1997, NUCL PHYS B, V504, P61 SQUIRES E, 1987, PHYS LETT A, V126, P73 URBANOWSKI K, 2002, PHYS LETT B, V540, P89 WEISSKOPF V, 1930, Z PHYS, V63, P54 WIDOM A, 1993, PHYS LETT B, V314, P315 NR 23 TC 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 912805, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD OCT 10 PY 2002 VL 17 IS 31 BP 2039 EP 2048 PG 10 SC Physics, Mathematical; Physics, Nuclear; Physics, Particles & Fields GA 619NQ UT ISI:000179483000002 ER PT J AU Luque-Garcia, JL Soto-Ayala, R de Castro, MDL TI Determination of the major elements in homogeneous and heterogeneous samples by tandem laser-induced breakdown spectroscopy-partial least square regression SO MICROCHEMICAL JOURNAL LA English DT Article DE laser-induced breakdown spectroscopy; partial least square regression; graphite furnace-atomic absorption spectroscopy; flame atomic emission spectroscopy ID QUANTITATIVE-ANALYSIS; SPECTROMETRY; EMISSION; ALLOYS AB The tandem laser-induced breakdown spectroscopy-partial least square regression (LIBS-PLS) was applied for the analysis of both, a smelting product from a noble metal ore (as example of a homogeneous sample) and a calcareous rock from a Maya building (as a heterogeneous sample). The method was designed for the analysis of both samples without perceptible deterioration of the pieces, by monitoring the emission lines of the major elements present in each sample while subjecting the pieces to a number of laser shots. The results obtained, as well as the precision provided by the LIBS-PLS method, were statistically compared with those obtained by graphite furnace-atomic absorption spectroscopy (for Ag and Cu) and flame atomic emission spectroscopy (for Ca), showing good agreement between methods. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Cordoba, Dept Analyt Chem, E-14071 Cordoba, Spain. UNAM, Fac Engn, Div Basic Sci, Mexico City, DF, Mexico. RP de Castro, MDL, Univ Cordoba, Dept Analyt Chem, Campus Rabanales,Annex C-3, E-14071 Cordoba, Spain. CR AMADORHERNANDEZ J, 2000, J ANAL ATOM SPECTROM, V15, P587 BARBINI R, 1997, APPL PHYS B-LASERS O, V65, P101 BERZAS JJ, 1998, ANALYST, V123, P483 CHALEARD C, 1997, J ANAL ATOM SPECTROM, V12, P183 DEALBA PLL, 1996, ANAL CHIM ACTA, V330, P19 GARCIAAYUSO LE, 2002, ANAL CHIM ACTA, V457, P247 HAALAND DM, 1988, ANAL CHEM, V60, P1193 HOENIG M, 1996, SPECTROCHIM ACTA B, V51, P1297 JURADOLOPEZ A, 2002, ANAL BIOANAL CHEM, V372, P109 KIM DE, 1997, APPL SPECTROSC, V51, P22 KUZUYA M, 1992, J ANAL ATOM SPECTROM, V7, P493 MARTENS H, 1993, MULTIVARIATE CALIBRA MASSART DL, 1997, HDB CHEMOMETRICS Q A, P388 NEMET B, 1995, J ANAL ATOM SPECTROM, V10, P631 RUTAN SC, 1998, ANAL CHEM, V70, P3198 STONGE L, 1997, J ANAL ATOM SPECTROM, V12, P997 THOMAS EV, 1990, ANAL CHEM, V62, P1091 NR 17 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0026-265X J9 MICROCHEM J JI Microchem J. PD DEC PY 2002 VL 73 IS 3 BP 355 EP 362 PG 8 SC Chemistry, Analytical GA 619QV UT ISI:000179488500011 ER PT J AU Cruz-Vera, LR Galindo, JM Guarneros, G TI Transcriptional analysis of the gene encoding peptidyl-tRNA hydrolase in Escherichia coli SO MICROBIOLOGY-SGM LA English DT Article DE bicistronic mRNA; mRNA stability; pth; ychF; RNase E ID TRANSFER-RNA HYDROLASE; COMPLETE GENOME SEQUENCE; PROTEIN-SYNTHESIS; POLYNUCLEOTIDE PHOSPHORYLASE; MESSENGER-RNA; INHIBITION; EXPRESSION; DNA; SENSITIVITY; DEGRADATION AB Gene pth encodes peptidyl-tRNA hydrolase (Pth), an enzyme that cleaves peptidyl-tRNAs released abortively from ribosomes during protein synthesis. In the Escherichia coli chromosome, pth is flanked by ychH and ychF, two genes of unknown function. Pth is essential for cell viability, especially under conditions leading to overproduction of peptidyl-tRNA. In an attempt to unveil the elements that affect pth expression, the transcriptional features of the pth region were investigated. Northern blot experiments showed that both pth and ychF, the T-proximal gene, are cotranscribed in a bicistronic transcript. However, transcripts containing each of the individual messages were also detected. Accordingly, two transcriptional promoters were identified by primer extension experiments: one located upstream of pth, which presumably gives rise to both the mono and bicistronic pth transcripts, and the other, preceding ychF, which generates its monocistronic message. Deletion analysis indicates that pth transcript stability depends on ychF integrity. Also, a defect in RNase E activity resulted in Pth overproduction. It is proposed that RNase E processing within ychF in the bicistronic message limits pth expression. C1 IPN, Ctr Invest & Estudios Avanzados, Dept Genet & Biol Mol, Mexico City 07000, DF, Mexico. RP Guarneros, G, IPN, Ctr Invest & Estudios Avanzados, Dept Genet & Biol Mol, Apdo Postal 14-740, Mexico City 07000, DF, Mexico. CR AIBA H, 1981, J BIOL CHEM, V256, P11905 ARTSIMOVITCH I, 1996, P NATL ACAD SCI USA, V93, P9408 ATHERLY AG, 1972, NATURE-NEW BIOL, V240, P245 AUBLE DT, 1988, J MOL BIOL, V202, P471 BARDWELL JCA, 1989, EMBO J, V8, P3401 CRUZVERA LR, 2000, J BACTERIOL, V182, P1523 DELAVEGA FM, 1996, GENE, V169, P97 DINCBAS V, 1999, J MOL BIOL, V291, P745 DUTKA S, 1993, NUCLEIC ACIDS RES, V21, P4025 FLEISCHMANN RD, 1995, SCIENCE, V269, P496 FROMANT M, 1999, BIOCHEMISTRY-US, V38, P4982 GALINDO JM, 1994, GENE, V151, P153 GARCIAMENA J, 1999, MOL MICROBIOL, V33, P235 GARCIAVILLEGAS MR, 1991, EMBO J, V10, P3549 GUZMAN G, 1989, GENETICS, V21, P401 HAJNSDORF E, 1994, J MOL BIOL, V239, P439 HAWLEY DK, 1983, NUCLEIC ACIDS RES, V11, P2237 HERNANDEZ J, 1997, BIOCHIMIE, V79, P527 HERNANDEZSANCHEZ J, 1998, EMBO J, V17, P3758 HEURGUEHAMARD V, 1998, EMBO J, V17, P808 HEURGUEHAMARD V, 2000, EMBO J, V19, P2701 HIGGINS CF, 1993, CONTROL MESSENGER RN, P13 JAIN C, 1995, GENE DEV, V9, P84 KOHARA Y, 1987, CELL, V50, P495 LESNIK EA, 2001, NUCLEIC ACIDS RES, V29, P3583 MANSON PJ, 1985, NUCL ADIC HYBRIDISAT, P213 MATEOS LM, 1994, J BACTERIOL, V176, P7362 MCCLELLAND M, 2001, NATURE, V413, P852 MCDOWALL KJ, 1993, J BACTERIOL, V175, P4245 MENEZ J, 2000, NUCLEIC ACIDS RES, V28, P4725 NICKERSON CA, 1995, J BACTERIOL, V177, P5756 ONTIVEROS C, 1997, J MOL BIOL, V269, P167 OSHIMA T, 1996, DNA RES, V3, P137 PARKHILL J, 2001, NATURE, V413, P469 REGNIER P, 1986, J MOL BIOL, V187, P23 RUDD KE, 1992, SHORT COURSE BACTERI SCHMITT E, 1997, EMBO J, V16, P4760 STOVER CK, 2000, NATURE, V406, P959 WOSTEN MMSM, 1998, FEMS MICROBIOL REV, V22, P127 ZILHAO R, 1995, FEMS MICROBIOL LETT, V130, P237 NR 40 TC 5 PU SOC GENERAL MICROBIOLOGY PI READING PA MARLBOROUGH HOUSE, BASINGSTOKE RD, SPENCERS WOODS, READING RG7 1AG, BERKS, ENGLAND SN 1350-0872 J9 MICROBIOLOGY-SGM JI Microbiology-(UK) PD NOV PY 2002 VL 148 PN Part 11 BP 3457 EP 3466 PG 10 SC Microbiology GA 617LN UT ISI:000179363300019 ER PT J AU Zapata, B Bosch, P Valenzuela, MA Fetter, G Flores, SO Cordova, IR TI Thermal stability of monometallic Co-hydrotalcite SO MATERIALS LETTERS LA English DT Article DE Co-hydrotalcite; microwave irradiation; thermal properties; catalysts ID PHASES AB Monometallic Co-6(2+) Co-2(3+) (OH)(-) (16)(NO3)(-) (2).nH(2)O hydrotalcite-like compound was prepared by a careful precipitation from an aqueous solution of Co(NO3)(2).6H(2)O in air atmosphere, followed by microwave irradiation. As comparison, an additional sample was prepared without microwave irradiation, employing aging in the crystallization step. Thermal evolution was studied by X-ray diffraction (XRD), FTIR, DTA/TGA and nitrogen physisorption. The microwaved sample (monometallic hydrotalcite) was stable up to 200 degreesC. The nonirradiated sample only showed the Co3O4 spinel phase. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Politecn Nacl, ESIQIE, Lab Catalisis & Mat, Mexico City 07738, DF, Mexico. Inst Mexicano Petr, Gerencia Catalisis, Mexico City 07730, DF, Mexico. Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico. Univ Autonoma Puebla, Fac Ciencias Quim, Puebla 72570, PUE, Mexico. Inst Politecn Nacl, ENCB, Dept Biofis, Mexico City 11340, DF, Mexico. RP Valenzuela, MA, Inst Politecn Nacl, ESIQIE, Lab Catalisis & Mat, Zacatenco, Mexico City 07738, DF, Mexico. CR ALLMANN R, 1968, ACTA CRYSTALLOGR B, V24, P972 BARRECA D, 2001, CHEM MATER, V13, P588 KLOPROGGE JT, 1999, APPL CATAL A-GEN, V184, P61 QIAN M, 1997, J MATER CHEM, V7, P493 TAYLOR RM, 1980, CLAY MINER, V15, P369 URBAN MW, 1993, VIBRATIONAL SPECTROS VACCARI A, 1998, CATAL TODAY, V41, P53 XU ZP, 1998, J MATER CHEM, V8, P2499 XU ZP, 1999, CHEM MATER, V11, P67 ZAPATA B, 2001, INT J INORG MATER, V3, P23 ZENG HC, 1998, CHEM MATER, V10, P2277 NR 11 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD DEC PY 2002 VL 57 IS 3 BP 679 EP 683 PG 5 SC Materials Science, Multidisciplinary; Physics, Applied GA 618MQ UT ISI:000179422200029 ER PT J AU Mendoza-Suarez, G Rivas-Vazquez, LP Fuentes, AF Escalante-Garcia, JI Ayala-Valenzuela, OE Valdez, E TI Preparation and magnetic properties of Zn-Ti subtituted Ba-ferrite powders SO MATERIALS LETTERS LA English DT Article DE Ba-ferrites; substitutions; zinc; titanium; magnetic properties; powder technology ID PARTICLES AB Zn-Ti-substituted barium ferrite powders were prepared by the sol-gel method and characterized. The room temperature magnetic properties were evaluated for different levels of dopant, Fe/Ba ratios, and heat-treatment temperatures. The results showed that M-s was not very much influenced by the substitution level up to 0.6 at.%. Contrarily, H-ci did show a marked decrease, owing to the reduction of the magnetocrystalline anisotropy of the BaM phase. On the other hand, an excess of Ba led to the decrease of 4, and the increase of H-ci. Additionally, Zn-Ti substitutions were effective in decreasing crystallite sizes below 100 nm. (C) 2002 Elsevier Science B.V. All rights reserved. C1 CINVESTAV, Saltillo 25000, Coahuila, Mexico. CIMAV, Ceram, Chihuahua 31109, Chih, Mexico. Inst Tec Saltillo, Dept Met Mecan, Saltillo 25280, Coahuila, Mexico. RP Mendoza-Suarez, G, CINVESTAV, Carr Saltillo Mty,KM 13 Ramos Arizpe,POB 663, Saltillo 25000, Coahuila, Mexico. CR FANG QQ, 2001, J MAGN MAGN MATER, V234, P366 LUBITZ P, 2000, J APPL PHYS, V17, P4978 MENDOZASUAREZ G, 2001, MATER SCI FORUM, V360, P531 ONG CK, 2000, J MAGN MAGN MATER, V213, P413 RANE MV, 1999, J MAGN MAGN MATER, V192, P288 SURIG C, 1996, J MAGN MAGN MATER, V157, P268 WANG CS, 1998, J MAGN MAGN MATER, V183, P2001 WEI FL, 1999, J MAGN MAGN MATER, V191, P249 WEI FL, 2000, J APPL PHYS, V87, P8636 NR 9 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD DEC PY 2002 VL 57 IS 4 BP 868 EP 872 PG 5 SC Materials Science, Multidisciplinary; Physics, Applied GA 618HK UT ISI:000179412500016 ER PT J AU Murillo, FR Alonso, AA Sanchez, RT TI Improving the corrosion resistance of a cooling water system at an ammonium sulfate crystallization plant by corrosion inhibitors SO MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION LA English DT Article AB This paper deals with some analyzed corrosion problems occurred in a cooling water system at an ammonium sulfate crystallization plant. A visual inspection to the cooling system was realized to evaluate the corrosion situation of the cooling system and determine the factors, which promoted corrosion damage. Chemical and physical properties of the water at the cooling system were determined, and corrosion rate measurements by different procedures were carried out. To improve efficiency, sodium monophosphate and thiourea, were added to one commercial inhibitor used at present. To evaluate the effectiveness of the modified inhibitor, a series of potentiodynamic polarization curves were accomplished. It was found that the best result was obtained by using sodium monophosphate at 500 ppm in the commercial corrosion inhibitor. C1 Univ Michoacana San Nicolas Hidalgo, Inst Invest Met, Morelia, Michoacan, Mexico. RP Sanchez, RT, Univ Michoacana San Nicolas Hidalgo, Inst Invest Met, Morelia, Michoacan, Mexico. CR *CSIC, 1989, PHOT SHOW CLEAN SURF, P429 FIAUD C, 1978, INHIBITEURS CORROSIO, P25 FLICK EW, 1978, CORROSION INHIBITORS, P23 FONTANA M, 1986, CORROSION ENG, P284 HATCH GB, 1973, CORROSION INHIBITORS, P125 JIANNRUEY C, 1991, SURF SCI, V247, P352 JONES AD, 1996, PRINCIPLES PREVENTIO, P503 KHVOSTOV VP, 1991, ZASHITA METALLOV, V26, P660 LEDOVSKIKH VM, 1993, ZASHCH MET, V29, P597 PARONKINA EA, 1990, KHIM TEKHNOL, V26, P148 SANYAL S, 1990, CORROSION PREVENTION, V37, P52 NR 11 TC 0 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0947-5117 J9 MATER CORROS JI Mater. Corros. PD NOV PY 2002 VL 53 IS 11 BP 820 EP 826 PG 7 SC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering GA 618PN UT ISI:000179426600003 ER PT J AU Seminoff, JA Resendiz, A Nichols, WJ TI Home range of green turtles Chelonia mydas at a coastal foraging area in the Gulf of California, Mexico SO MARINE ECOLOGY-PROGRESS SERIES LA English DT Article DE Eastern Pacific Ocean; Sea of Cortez; black turtle; wildlife telemetry; fixed kernel density estimator; minimum convex polygon ID ASCENSION ISLAND; HABITAT USE; MOVEMENTS; BEHAVIOR; ESTIMATORS; TELEMETRY; PATTERNS AB The green turtle Chelonia mydas is a circumglobal species that is susceptible to overexploitation as a food resource and incidental mortality in fisheries. Efforts to recover regional green turtle populations have been hampered by a lack of information on their biology. In particular, turtle movements and home ranges in neritic foraging habitats are not well understood. Thus, wildlife managers cannot accurately determine the habitat needs of green turtle populations. To address these understudied aspects, we carried out the first ever investigation of green turtle home range in neritic foraging habitats of the eastern Pacific Ocean. Twelve turtles, ranging from 50.9 to 82.5 cm in straight carapace length and from 17 to 70 kg in mass, were tracked with radio and sonic telemetry for 34 to 96 d at the Bahia de los Angeles foraging area in the Gulf of California, Mexico. Home range areas determined with minimum convex polygon and fixed kernel density estimator methods ranged from 584 to 3908 ha (mean = 1662 +/- 324 ha) and 409 to 3231 ha (mean = 1537 +/- 280 ha), respectively. There was no evidence that straight carapace length, mass, sex, tracking duration or number of re-sightings influenced the size of the home range. Green turtle home ranges contained from 1 to 3 activity centers ranging from 3.8 to 642.2 ha in area (mean = 178.8 +/- 62.0 ha). Turtles were re-sighted in all depth-class regions (0 to 10 m to 40+ m) in the study area but were not found with equal frequency among these regions. The distribution of re-sightings among depth classes varied significantly between diurnal (05:00 to 18:59 h) and nocturnal (19:00 to 04:59 h) periods. While the greatest frequency of diurnal re-sightings occurred in the 10 to 20 m depth class, nocturnal encounters were most frequent in the 0 to 10 m depth class. This study shows that Bahia de los Angeles remains an important feeding ground; thus, underscoring the need to develop conservation strategies that address the impacts of ongoing commercial marine-algae harvests and net fisheries that threaten green turtles in this region. C1 Univ Florida, Archie Carr Ctr Sea Turtle Res, Gainesville, FL 32611 USA. Univ Florida, Dept Zool, Gainesville, FL 32611 USA. Inst Nacl Ecol, Direcc Gen Vida Silvestre, Secretaria Medio Ambiente & Recursos Nat, Ensenada, Baja California, Mexico. Calif Acad Sci, Dept Herpetol, San Francisco, CA 94118 USA. Wildcoast Int Conservat Team, Davenport, CA 95017 USA. RP Seminoff, JA, NOAA, SW Fisheries Sci Ctr, Natl Marine Fisheries Serv, 8604 La Jolla Shores Dr, La Jolla, CA 92037 USA. CR 2001, PROYECTO ESCALERA NA *NAT MAR FISH SERV, 1998, REC PLAN US PAC POP *SAS I, 1996, GUID STAT DAT AN US ALVARADO J, 1992, BIOTROPICA, V24, P560 ALVARADODIAZ J, 2001, MARINE TURTLE NEWSLE, V92, P4 BAILEY JA, 1984, PRINCIPLES WILDLIFE BALAZS GH, 1987, NOAA TECH MEMO NMFS, V71 BALAZS GH, 1996, P 15 ANN S SEA TURTL, P21 BJORNDAL KA, 1990, B MAR SCI, V47, P567 BJORNDAL KA, 1991, ECOLOGY, V72, P1234 BJORNDAL KA, 1997, BIOL SEA TURTLES, P199 BRAY NA, 1991, GULF PENINSULAR PROV, P511 BRILL RW, 1995, J EXP MAR BIOL ECOL, V185, P203 BRUSCA R, 1980, COMMON INTERTIDAL IN BURT WH, 1943, J MAMMAL, V24, P346 CALDWELL DK, 1963, CALIF FISH GAME, V49, P140 CARR A, 1980, COPEIA, P366 CARR A, 1986, SEA TURTLE EXCELLENT CARR A, 1987, CONSERV BIOL, V1, P103 CLIFFTON K, 1982, BIOL CONSERVATION SE, P199 COHEN J, 1983, APPL MULTIPLE REGRES DIXON KR, 1980, ECOLOGY, V61, P1040 FELGER RS, 1976, SCIENCE, V191, P283 FIGUEROA A, 1993, ECOLOGICAL RECOVERY GALLERANI EJ, 1997, WILDLIFE SOC B, V25, P721 GARDNER SC, 2001, CHELONIAN CONSERV BI, V4, P197 GODLEY BJ, 1998, MAR ECOL-PROG SER, V166, P277 GONZALEZSOLIS J, 2000, MAR ECOL-PROG SER, V204, P279 GROOMBRIDGE B, 1989, GREEN TURTLE HAWKSBI HANSTEEN TL, 1997, J WILDLIFE MANAGE, V61, P280 HAYS GC, 2000, ANIM BEHAV 3, V59, P577 HILTONTAYLOR C, 2000, 2000 IUCN RED LIST T, P1 HIRTH HF, 1992, MICRONESICA, V25, P145 HIRTH HF, 1997, 971 US FISH WILDL SE HYRENBACH KD, 2002, MAR ECOL-PROG SER, V233, P283 KENWARD RE, 2001, MANUAL WILDLIFE RADI LIMPUS CJ, 1994, MEMOIRS QUEENSLAND M, V35, P139 LIMPUS CJ, 1995, BIOL CONSERVATION SE, P605 MELLAS EJ, 1985, CAN J FISH AQUAT SCI, V42, P488 MENDONCA MT, 1983, COPEIA, P1013 MORTIMER JA, 1989, COPEIA, P962 MUSICK JA, 1997, BIOL SEA TURTLES, P137 OGDEN JC, 1983, J EXP MAR BIOL ECOL, V66, P199 PACHECORUIZ I, 1999, HYDROBIOLOGIA, V398, P509 RENAUD ML, 1994, B MAR SCI, V55, P1 RENAUD ML, 1995, FISH B-NOAA, V93, P586 RICE MR, 2000, NOAA TECH MEMO NMFS, V438, P229 RIDGWAY SH, 1969, P NATL ACAD SCI USA, V64, P884 SCHMID JR, 2002, MAR BIOL, V140, P215 SEAMAN DE, 1996, ECOLOGY, V77, P2075 SEMINOFF JA, 2000, HERPETOL REV, V31, P103 SEMINOFF JA, 2000, THESIS U ARIZONA TUS SEMINOFF JA, 2002, J HERPETOL, V36, P447 SILVERMAN BW, 1986, DENSITY ESTIMATION S SPOTILA JR, 1997, BIOL SEA TURTLES, P297 SWIHART RK, 1985, J WILDLIFE MANAGE, V49, P1019 VANDAM RP, 1998, J EXP MAR BIOL ECOL, V220, P15 WATSON KP, 1998, J EXP BIOL, V201, P2497 WHITE GC, 1990, ANAL WILDLIFE RADIOT WHITING SD, 1998, J HERPETOL, V32, P330 WIBBELS TH, 1999, IUCN SSC MAR TURT SP, V4, P139 WOOD AG, 2000, J AVIAN BIOL, V31, P278 WORTON BJ, 1987, ECOL MODEL, V38, P277 WORTON BJ, 1989, ECOLOGY, V70, P164 NR 64 TC 5 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0171-8630 J9 MAR ECOL-PROGR SER JI Mar. Ecol.-Prog. Ser. PY 2002 VL 242 BP 253 EP 265 PG 13 SC Ecology; Marine & Freshwater Biology GA 619EZ UT ISI:000179463800022 ER PT J AU Lopez-Gonzalez, JS Aguilar-Cazares, D Prado-Garcia, H Nieto-Rodriguez, A Mandoki, JJ Avila-Moreno, F Rivera, RM Chavarria-Garces, J TI Lack of correlation between growth inhibition by TGF-beta and the percentage of cells expressing type II TGF-beta receptor in human non-small cell lung carcinoma cell lines SO LUNG CANCER LA English DT Article DE TGF-beta isoforms; TGF-beta RII; SCLC cell lines; NSCLC cell lines; growth inhibitions; ELISA; flow cytometry; RNA messenger; RT-PCR ID BRONCHIAL EPITHELIAL-CELLS; CANCER CELLS; MICROSATELLITE INSTABILITY; RESPIRATORY-TRACT; MESSENGER-RNA; MUTATIONS; PROLIFERATION; TUMORS; DIFFERENTIATION; INACTIVATION AB To determine the mechanisms involved in the evasion from TGF-beta growth regulation in the small cell lung carcinoma (SCLC) cell lines and the non-small cell lung carcinoma (NSCLC) cell lines, we studied: (a) production of TGF-beta1 and TGF-beta2; (b) percentage of cells expressing TGF-beta RII; (c) responsiveness of the tumour cell lines to exogenous TGF-beta1 or TGF-beta2; and (d) presence of mRNA transcripts of the three TGF-beta isoforms and of the TGF-beta RII. Our results indicate that the SCLC cell lines do not synthesize the isoforms TGF-beta1 and TGF-beta2 nor the TGF-beta RII, thus avoiding inhibitory autocrine and paracrine TGF-beta actions. However, NSCLC cell lines express not only TGF-beta1. TGF-beta2 and TGF-beta RII mRNA transcripts, but also synthesize both isoforms and the TGF-beta RII. Although approximately 50% of the cells from the studied cell lines expressed the TGF-beta RII, different cell lines varied greatly in the sensitivity to the inhibitory action of TGF-beta. This could result from alterations in: (i) the structure of TGF-beta RII; (ii) the phosphorylation motif of TGF-beta RI; (iii) the molecules involved in the intracellular signalling pathway of TGF-beta; and (iv) cell cycle regulation. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved. C1 Inst Nacl Enfermedades Resp, Dept Enfermedades Cronico Degenerat, Mexico City 14080, DF, Mexico. Univ Nacl Autonoma Mexico, Fac Med, Dept Farmacol, Mexico City 04510, DF, Mexico. Inst Nacl Enfermedades Resp, Dept Patol, Mexico City 14080, DF, Mexico. Inst Nacl Enfermedades Resp, Serv Clin 3, Mexico City 14080, DF, Mexico. RP Lopez-Gonzalez, JS, Inst Nacl Enfermedades Resp, Dept Enfermedades Cronico Degenerat, Tlalpan 4502 Col Seccion 15, Mexico City 14080, DF, Mexico. 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In the present study, two experiments with domestic sheep assessed the aversive value of the manure of four farm species under fresh and dry conditions. In Experiment 1, a 5 m corridor was used. Feces were placed at one end, and 10 sheep were individually introduced from the opposite end, recording the time spent in each 1 m section. In Experiment 2, buckets with a wire mesh divider were used. The corresponding treatment was in the bottom and commercial concentrate was in the upper part. Ten sheep different from those in Experiment 1 were exposed individually to each treatment, recording the time spent eating and the amount of food consumed. In Experiment 1, significant aversion was found to manure from cattle. In Experiment 2, no difference was found for time eating. However, less food consumption was found in the cattle manure treatment. In both trials, no difference was found when fresh and dry feces were compared. A low association (r = 0.57) was found between the aversion ranked order of the manure from different species in both experiments. However, both experiments coincided with cattle manure as the highest ranked aversion excreta. It was concluded that: (1) cattle manure is the most repulsive excreta from the farm species evaluated; and (2) some results may vary according to the test applied. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Autonoma Estado Morelos, Fac Ciencias Agropecuarias, Cuernavaca 62051, Morelos, Mexico. Univ Colima, Posgrado Interinstituc & Ciencias Pecuarias, Colima, Mexico. RP Orihuela, A, Univ Autonoma Estado Morelos, Fac Ciencias Agropecuarias, Apartado Postal 5-78, Cuernavaca 62051, Morelos, Mexico. CR *SAS I, 1985, SAS US GUID STAT ABBOTT DH, 1990, CHEM SIGNALS VERTEBR, V5, P599 AOYAMA M, 1994, APPL ANIM BEHAV SCI, V40, P253 ARNOULD C, 1993, J CHEM ECOL, V19, P225 DOHI H, 1991, J CHEM ECOL, V17, P1197 FRASER AF, 1998, FARM ANIMAL BEHAVIOU, P437 LOTT DF, 1979, APPL ANIM ETHOL, V5, P309 MACDIARMID BN, 1972, J BRIT GRASSLAND SOC, V27, P48 MARTEN GC, 1966, P 10 INT GRASSL C HE, P359 MELCHIORS MA, 1985, J WILDLIFE MANAGE, V49, P358 MULLERSCHWARZE D, 1972, J MAMMAL, V53, P393 NORMAN MJT, 1958, J BRIT GRASSLAND SOC, V13, P39 SIEGEL S, 1988, NONPARAMETRIC STAT B, P399 SULLIVAN TP, 1985, J CHEM ECOL, V11, P921 WEEDA WC, 1967, NZ J AGR RES, V10, P150 NR 15 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-6226 J9 LIVEST PROD SCI JI Livest. Prod. Sci. PD NOV 1 PY 2002 VL 77 IS 2-3 BP 119 EP 125 PG 7 SC Agriculture, Dairy & Animal Science GA 618KB UT ISI:000179416300001 ER PT J AU Moncho-Jorda, A Martinez-Lopez, F Gonzalez, AE Hidalgo-Alvarez, R TI Role of long-range repulsive interactions in two-dimensional colloidal aggregation: Experiments and simulations SO LANGMUIR LA English DT Article ID AIR-WATER-INTERFACE; 2 DIMENSIONS; MOLECULAR-DYNAMICS; BOUNDARY-LAYER; PARTICLES; MONOLAYERS; SYSTEMS; PHASES; BEADS AB A theoretical model for the interaction between colloidal particles trapped at the air-water interface is proposed in order to explain experimental aggregation results. Kinetic and structural aspects of 2D aggregation processes point out the long-range nature of the particle interactions. These interactions have been modeled by means of monopolar and dipolar repulsive forces, which depend on the monopole and dipole surface fractions at the emergent part of the colloidal particles, f(mon) and f(dip), respectively. Brownian dynamics simulations have been used to fit the model to experiment results using the fractal dimension d(f) and the kinetics exponent z as comparative parameters. Simulation results show that dipolar interaction controls aggregation at high subphase salt concentration whereas the monopolar interaction determines aggregation at low salt concentrations. Moreover, results show that f(mon) is the main parameter controlling kinetics in 2D aggregation and, hence, a critical coagulation concentration (CCC) can be defined from the salt concentration at which the monopole fraction becomes zero, f(mon) = 0. C1 Univ Granada, Biocolloid & Fluid Phys Grp, Dept Appl Phys, E-18071 Granada, Spain. Natl Autonomous Univ Mexico, Ctr Phys Sci, Cuernavaca 62251, Morelos, Mexico. RP Hidalgo-Alvarez, R, Univ Granada, Biocolloid & Fluid Phys Grp, Dept Appl Phys, E-18071 Granada, Spain. CR AVEYARD R, 2000, LANGMUIR, V16, P1969 BROWN WD, 1984, KINETICS AGGREGATION CARBAJALTINOCO MD, 1996, PHYS REV E B, V53, P3745 CHAN DYC, 1981, J COLLOID INTERF SCI, V79, P410 CHRISTENSON HK, 1988, SCIENCE, V239, P390 CROCKER JC, 1996, PHYS REV LETT, V77, P1897 DHONT JKG, 1996, INTRO DYNAMICS COLLO GONZALEZ AE, 1993, PHYS REV LETT, V71, P2248 GONZALEZ AE, 2002, J COLLOID INTERF SCI, V246, P227 GREGORY J, 1981, J COLLOID INTERF SCI, V83, P138 GUEZZI F, 1997, J PHYS CONDENS MATT, V9, L517 HIDALGOALVAREZ R, 1996, ADV COLLOID INTERFAC, V67, P1 HORVOLGYI Z, 1991, COLLOID SURFACE, V60, P79 HORVOLGYI Z, 1993, COLLOID POLYM SCI, V271, P396 HORVOLGYI Z, 1993, COLLOID SURFACE A, V71, P327 HORVOLGYI Z, 1994, COLLOID SURFACE A, V84, P207 HURD AJ, 1985, J PHYS A, V18, P1055 HURD AJ, 1985, PHYS REV LETT, V54, P1043 ISRAELACHVILI J, 1992, INTERMOLECULAR SURFA KEPLER GM, 1994, PHYS REV LETT, V73, P356 LEKNER J, 1991, PHYSICA A, V176, P485 MARTINEZLOPEZ E, 2000, J COLLOID INTERF SCI, V232, P303 MEAKIN P, 1985, PHYS REV B, V31, P564 MONCHOJORDA A, 2001, EUR PHYS J E, V50, P471 MONCHOJORDA A, 2002, J COLLOID INTERF SCI, V249, P405 OHSHIMA H, 1998, ELECT PHENOMENA INTE PIERANSKI P, 1980, PHYS REV LETT, V45, P569 PRESS WH, 1995, NUMERICAL RECIPES C QUESADAPEREZ M, 2001, J CHEM PHYS, V115, P10897 RHEE YJ, 1989, PHYS REV B, V40, P36 RISKEN H, 1989, FOKKERPLANCK EQUATIO ROBINSON DJ, 1992, PHYS REV A, V46, P2045 ROBINSON DJ, 1992, PHYS REV A, V46, P2055 ROBINSON DJ, 1993, LANGMUIR, V9, P1436 RUIZGARCIA J, 1998, PHYS REV E, V58, P660 SONNTAG H, 1987, KINETICS STRUCTURE F STAMOU D, 2000, PHYS REV E B, V62, P5263 STILLINGER FH, 1961, J CHEM PHYS, V35, P1584 SUN JZ, 2001, LANGMUIR, V17, P3103 TERAO T, 1999, PHYS REV E B, V60, P7157 VERWEY EJW, 1948, THEORY STABILITY LYO VICSEK T, 1992, FRACTAL GROWTH PHENO VINCZE A, 1997, J CHEM PHYS, V107, P7451 WILLIAMS DF, 1992, J COLLOID INTERF SCI, V152, P218 NR 44 TC 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD NOV 26 PY 2002 VL 18 IS 24 BP 9183 EP 9191 PG 9 SC Chemistry, Physical GA 618QH UT ISI:000179428400012 ER PT J AU Khan, SA Wolf, KB TI Hamiltonian orbit structure of the set of paraxial optical systems SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB In the paraxial regime of three-dimensional optics, two evolution Hamiltonians are equivalent when one can be transformed to the other modulo scale by similarity through an optical system. To determine the equivalence sets of paraxial optical Hamiltonians one requires the orbit analysis of the algebra sp(4, R) of 4 x 4 real Hamiltonian matrices. Our strategy uses instead the isomorphic algebra so(3, 2) of 5 x 5 matrices with metric (+1, +1, +1, -1, -1) to find four orbit regions (strata), six isolated orbits at their boundaries, and six degenerate orbits at their common point. We thus resolve the degeneracies of the eigenvalue classification. (C) 2002 Optical Society of America. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Cuernavaca 62251, Morelos, Mexico. RP Wolf, KB, Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Apartado Postal 48-3, Cuernavaca 62251, Morelos, Mexico. CR DIRAC PAM, 1963, J MATH PHYS, V4, P901 DRAGT AJ, 1986, LECTURE NOTES PHYSIC, V250, P105 DRAGT AJ, 1987, NUCL INSTRUM METH A, V258, P339 FRONSDAL C, 1965, REV MOD PHYS, V37, P201 GILMORE R, 1974, LIE GROUPS LIE ALGEB KAUDERER M, 1994, SYMPLECTIC MATRICES LAUB AJ, 1974, CELESTICAL MECH, V9, P213 MOSHINSKY M, 1980, J MATH PHYS, V21, P1667 OZAKTAS HM, 2001, FRACTIONAL FOURIER T PATERA J, 1977, J MATH PHYS, V18, P2259 PATERA J, 1983, J MATH PHYS, V24, P1973 PHILIPS TO, 1968, GROUP THEORY ITS APP, P631 SIMON R, 1985, PHYS REV A, V31, P2419 SIMON R, 2000, J OPT SOC AM A, V17, P2368 SIMON R, 2000, J OPT SOC AM A, V17, P342 STEINBERG S, 1986, LECT NOTE PHYS, V250, P45 WOLF KB, 1967, NUOVO CIMENTO S, V5, P1041 WOLF KB, 1987, J MATH PHYS, V28, P2498 NR 18 TC 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3232 J9 J OPT SOC AM A-OPT IMAGE SCI JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD DEC PY 2002 VL 19 IS 12 BP 2436 EP 2444 PG 9 SC Optics GA 619LR UT ISI:000179477900011 ER PT J AU Schweitzer, CE Feldmann, RM Gonzalez-Barba, G Vega, FJ TI New crabs from the Eocene and Oligocene of Baja California Sur, Mexico and an assessment of the evolutionary and paleobiogeographic implications of Mexican fossil decapods SO JOURNAL OF PALEONTOLOGY LA English DT Review ID CRETACEOUS ROSARIO FORMATION; N-SP DECAPODA; NORTH-AMERICA; TEPETATE FORMATION; MIDDLE EOCENE; BRACHYURA; CRUSTACEA; WASHINGTON; FAUNA; REEVALUATION AB A new collection of fossil decapod crustaceans from the Cretaceous Rosario Formation, the Eocene Tepetate Formation and the Oligocene El Cien Formation, Baja California Sur, Mexico, has yielded two new genera and several new species, Anlydrocarcinus dantei n. gen. and sp., Levicyclus tepetate n. gen. and sp,, Eriosachila bajaensis n. sp., Oregonia spinifera n. sp., Archaeopus mexicanus n. sp., and Necronectes nodosa n. sp. Additionally, new occurrences of the previously described Lophoranina bishopi, Xandaros sternbergi, Icriocarcinus xestos, and Lobonotus mexicanus as well as Dardanus cf. D. mexicanus are reported. As part of ongoing work on global evolutionary and paleobiogeographic patterns within the Decapoda, the work has prompted a review and synthesis of decapod occurrences in the tropical and subtropical Americas including the southern United States, the Caribbean, Mexico, Central America, and northern South America. As a result of the systematic review, several new combinations are reported herein which include Eriosachila bartholomaeensis (Rathbun, 1919), Lobonotus sandersi (Blow and Manning, 1996; 1998), and Matutites americamis (Rathbun, 1935). kriocarcinus is transferred to the Goneplacidae, extending the range of that family into the Cretaceous. Most Cretaceous through Miocene tropical and subtropical American taxa appear to have originated within the area and a large number were endemic. Most of the immigrants to the central Americas appear to have evolved along North Atlantic shelves and subsequently dispersed to the Americas, probably via continental shelf routes. In addition, as demonstrated by several previous studies, decapod crustaceans appear to have evolved in numerous middle- and high- latitude areas with subsequent dispersal to lower latitudes, contrary to the long held notion that the tropics are areas of origin with subsequent dispersal to other regions. Low-latitude decapod taxa tend to remain in low-latitude areas. The Maastrichtian and the Eocene appear to have been times of elevated extinctions within the Decapoda; however, the extinction patterns for those two time intervals are very complex. C1 Kent State Univ, Dept Geol, Canton, OH 44720 USA. Kent State Univ, Dept Geol, Kent, OH 44242 USA. UABCS, Dept Geol, La Paz 23080, BCS, Mexico. Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico. RP Schweitzer, CE, Kent State Univ, Dept Geol, Stark Campus, Canton, OH 44720 USA. 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P183 VONMEYER H, 1935, JB MINERALOGIE GEOLO VONZITTEL KA, 1885, HDB PALAEONTOLOGIE, V1, P679 WARNER GF, 1977, BIOL CRABS WEBER F, 1795, NOMENCLATOR ENTOMOLO WEBSTER ML, 1983, J PALEONTOL, V57, P1090 WELLER S, 1905, J GEOL, V13, P324 WHITE A, 1843, ANN MAG NAT HIST, V12, P342 WHITE A, 1847, ANN MAGAZINE NATURAL, V20, P205 WHITE A, 1852, NARRATIVE VOYAGE H M, V2, P387 WHITEAVES JF, 1884, T ROYAL SOC CANADA, V2, P237 WHITEAVES JF, 1895, ROYAL SOC CANADA T, V1, P119 WHITFIELD RP, 1978, CONTRIBUTIONS PALEON, P37 WILLIAMS AB, 1984, SHRIMPS LOBSTERS CRA WITHERS TH, 1922, ANN MAGAZINE NATURAL, V10, P534 WITHERS TH, 1924, ANN MAGAZINE NATURAL, V14, P225 WOODWARD H, 1896, Q J GEOL SOC LOND, V52, P221 WOODWARD H, 1966, Q J GEOL SOC LOND, V22, P591 YOKOYA U, 1928, SCI REPORT TOHOKU IM, V4, P757 NR 246 TC 2 PU PALEONTOLOGICAL SOC INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044 USA SN 0022-3360 J9 J PALEONTOL JI J. Paleontol. PD NOV PY 2002 VL 76 IS 6 SU Suppl. S BP 1 EP 43 PG 43 SC Paleontology GA 619RC UT ISI:000179489300001 ER PT J AU Schaller, M Hoffmann, KH Rivero, R Andresen, B Salamon, P TI The influence of heat transfer irreversibilities on the optimal performance of diabatic distillation columns SO JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS LA English DT Article ID SEPARATION PROCESSES; BINARY DISTILLATION; EQUIPARTITION AB A distillation column with the possibility of heat exchange on every tray (a fully diabatic column) is optimized in the sense of minimizing its total entropy production. This entropy production counts the interior losses due to heat and mass flow as well as the entropy generated in the heat exchangers. It is observed that the optimal heating distribution, i.e. the heat exchange required on each tray, is essentially the same for all trays in the stripping and rectification sections, respectively. This makes a column design with consecutive interior heat exchanger and only one exterior supply for each of the two sections very appealing. The result is only slightly dependent on the heat transfer law considered. In the limit of an infinite number of trays even this column with resistance to transfer of heat becomes reversible. C1 Tech Univ Chemnitz, Dept Phys, D-09107 Chemnitz, Germany. Mexican Inst Petr, Mexico City, DF, Mexico. Univ Copenhagen, Orsted Lab, Copenhagen, Denmark. San Diego State Univ, Dept Math Sci, San Diego, CA 92182 USA. RP Schaller, M, Tech Univ Chemnitz, Dept Phys, D-09107 Chemnitz, Germany. CR ANDERSEN TR, 2000, P ESCAPE 2000 SERIES ANDRESEN B, 2000, THERMODYNAMICS ENERG, P319 BROWN D, 1998, THESIS SAN DIEGO STA DEKOEIJER GM, 2001, P ECOS2001 KING CJ, 1971, SEPARATION PROCESSES LEWIS GN, 1961, THERMODYNAMICS PRESS WH, 1992, NUMERICAL RECIPES C RIVERO R, 1993, THESIS I NATL POLYTE RIVERO R, 2001, ENERGY, V26, P561 SALAMON P, 1998, EUROPHYS LETT, V42, P571 SAUAR E, 2001, J PHYS CHEM A, V105, P2312 SCHALLER M, 2001, COMPUT CHEM ENG, V25, P1537 TONDEUR D, 1987, IND ENG CHEM RES, V26, P50 NR 13 TC 8 PU WALTER DE GRUYTER & CO PI BERLIN PA GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY SN 0340-0204 J9 J NON-EQUIL THERMODYN JI J. Non-Equilib. Thermodyn. PY 2002 VL 27 IS 3 BP 257 EP 269 PG 13 SC Mechanics; Thermodynamics GA 618ZG UT ISI:000179447700005 ER PT J AU Roman, LU Cerda-Garcia-Rojas, CM Guzman, R Armenta, C Hernandez, JD Joseph-Nathan, P TI Jiquilpane hydrocarbon skeleton generated by two successive Wagner-Meerwein rearrangements of longipinane derivatives SO JOURNAL OF NATURAL PRODUCTS LA English DT Article ID DOUBLE MICHAEL ADDITION; (+/-)-CULMORIN; RASTEVIONE AB The molecular rearrangement of (1R,3S,4S,5S,7S,8R,9S,10R,11-R)-7,8,9-triacetyloxylongipinan-1-ol (4) under acidic conditions afforded (1S,4R,5R,7S,8R,9S,10S)-7,8,9-triacetyloxvuruap-3(12)-ene (5), while 6, the C(3)-stereoisomer of 4, after two consecutive Wagner-Meerwein rearrangennents followed by two 1,2-hydride migrations, afforded (4R,5R,7S,8S,9S,10S,11S)-7,8,9-triacetyloxyjiquilp-3(12)-ene (7), which possesses a new hydrocarbon skeleton. The structures of the new substances were, elucidated by 1D and 2D NMR data in combination with X-ray diffraction analyses of the uruapane. longipinane, and jiquilpane derivatives 5, 6, and 14, respectively. Molecular modeling at the ab initio level Was Used to study the reaction mechanisms, while deuterium labeling was employed to confirm the C-C bond migrations and the hydride shifts. C1 Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. Univ Michoacana, Inst Invest Quim Biol, Morelia 58000, Michoacan, Mexico. RP Joseph-Nathan, P, Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Apartado 14-740, Mexico City 07000, DF, Mexico. EM pjoseph@nathan.chem.cinvestav.mx CR AYDIN R, 1984, J ORG CHEM, V49, P3845 BAUER K, 1998, COMMON FRAGRANCE FLA, P73 BURKERT U, 1982, ACS MONOGRAPH, V177 CAREY FA, 1990, ADV ORGANIC CHEM A, P313 CERDAGARCIAROJA.CM, 2002, MED AROMATIC PLANTS, V19, P86 CERDAGARCIAROJAS CM, 2002, TETRAHEDRON, V58, P1061 CLARK M, 1989, J COMPUT CHEM, V10, P982 CROMER D, 1975, J AM CHEM SOC, V97, P1354 FARRUGIA LJ, 1999, J APPL CRYSTALLOGR, V32, P837 HERNANDEZ LR, 1998, REV ACAD COLOMB CIEN, V22, P229 JOSEPHNATHAN P, 1979, J AM CHEM SOC, V101, P1289 KONIG GM, 1996, PLANTA MED, V62, P193 KULA J, 1998, FLAVOUR FRAG J, V13, P277 PIETRO WJ, 1982, J AM CHEM SOC, V104, P5039 ROMAN LU, 1981, TETRAHEDRON, V37, P2769 ROMAN LU, 1985, J ORG CHEM, V50, P3965 ROMAN LU, 1991, J ORG CHEM, V56, P1938 ROMAN LU, 1992, J NAT PROD, V55, P577 ROMAN LU, 1995, J NAT PROD, V58, P1808 ROMAN LU, 1996, J NAT PROD, V59, P391 ROMAN LU, 2001, TETRAHEDRON, V57, P7269 SHELDRICK GM, 1998, PROGRAMS CRYSTAL STR STRONGMAN DB, 1987, BOT MAR, V30, P21 TAKASU K, 1999, ORG LETT, V1, P391 TAKASU K, 2000, J ORG CHEM, V65, P4112 WANG YZ, 1988, J PHYTOPATHOL, V122, P118 ZOTOV A, 1994, RICON PROGRAM VERSIO NR 27 TC 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0163-3864 J9 J NAT PROD JI J. Nat. Prod. PD NOV PY 2002 VL 65 IS 11 BP 1540 EP 1546 PG 7 SC Chemistry, Applied; Chemistry, Medicinal; Pharmacology & Pharmacy; Plant Sciences GA 618AK UT ISI:000179394400006 ER PT J AU Pestryakov, AN Lunin, VV Kharlanov, AN Kochubey, DI Bogdanchikova, N Stakheev, AY TI Influence of modifying additives on electronic state of supported gold SO JOURNAL OF MOLECULAR STRUCTURE LA English DT Article DE gold catalysts; electronic states; IR spectroscopy; UV-visible spectroscopy ID GAS SHIFT REACTION; CARBON-MONOXIDE; AU/ALPHA-FE2O3 CATALYST; SELECTIVE OXIDATION; SILVER CATALYSTS; CO OXIDATION; SURFACE; OXIDES; TEMPERATURE; METHANOL AB Using the methods of IR spectroscopy of adsorbed CO, electron spectroscopy of diffuse reflectance, XRD, XPS, EXAFS and electron microscopy the influence of modifying additions of Ce, Zr, La and Cs oxides on the surface electronic states of supported gold have been studied. The additions of Ce and Zr oxides stabilize the ionic states of supported gold and increase the effective charge of the ions. In contrast, La and Cs oxides lower the effective charge of gold cation and favor their fast reduction. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Tomsk Polytech Univ, Dept Organ Chem, Tomsk 634034, Russia. Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia. Boreskov Inst Catalysis, Novosibirsk 630090, Russia. Ctr Ciencias Mat Condensada, Ensenada 22800, Baja California, Mexico. Inst Organ Chem, Moscow 119899, Russia. RP Pestryakov, AN, Tomsk Polytech Univ, Dept Organ Chem, Lenin Ave 30, Tomsk 634034, Russia. CR ANDREEVA D, 1996, APPL CATAL A-GEN, V134, P275 ANDREEVA D, 1998, APPL CATAL A-GEN, V169, P9 ARAKI M, 1976, J CATAL, V44, P439 BOCCUZZI F, 1996, J PHYS CHEM-US, V100, P3625 DAVYDOV AA, 1990, INFRARED SPECTROSCOP EPLING WS, 1996, J PHYS CHEM-US, V100, P9929 GRUNWALDT JD, 1999, J CATAL, V186, P458 IIZUKA Y, 1997, CATAL TODAY, V36, P115 KOCHETKOVA EI, 1992, ZH FIZ KHIM, V66, P1667 KOZLOV AI, 1999, APPL CATAL A-GEN, V182, P9 LAMBER R, 1995, J PHYS CHEM-US, V99, P13834 LIVER E, 1987, ELECT SPECTROSCOPY I, P491 MOULDER JF, 1992, HDB XRAY PHOTOELECTR PESTRYAKOV AN, 1994, APPL CATAL A-GEN, V120, P7 PESTRYAKOV AN, 1996, APPL SURF SCI, V103, P479 PESTRYAKOV AN, 1996, CATAL TODAY, V28, P239 PESTRYAKOV AN, 1996, DIV PETR CHEM, V41, P96 PESTRYAKOV AN, 1998, THESIS MOSCOW STAT U PESTRYAKOV AN, 2000, J MOL CATAL A-CHEM, V158, P325 PONEC V, 1998, J MOL CATAL A-CHEM, V133, P221 PRATI L, 1998, J CATAL, V176, P552 RUGGIERO C, 1996, J CHEM SOC FARADAY T, V92, P4829 SAKURAI H, 1995, APPL CATAL A-GEN, V127, P93 SAKURAI H, 1996, CATAL TODAY, V29, P361 SALAMA TM, 1996, J CHEM SOC FARADAY T, V92, P301 SANCHEZ RMT, 1997, J CATAL, V168, P125 TRIPATHI K, 1999, J CATAL, V198, P332 XU Q, 1997, J ORG CHEM, V62, P1594 YUAN YZ, 1996, CATAL LETT, V42, P15 NR 29 TC 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2860 J9 J MOL STRUCT JI J. Mol. Struct. PD DEC 4 PY 2002 VL 642 IS 1-3 BP 129 EP 136 PG 8 SC Chemistry, Physical GA 619PX UT ISI:000179486200015 ER PT J AU Torres, E Baeza, A Vazquez-Duhalt, R TI Chemical modification of heme group improves hemoglobin affinity for hydrophobic substrates in organic media SO JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC LA English DT Article DE chemical modification; heme; hemoglobin; hydrophobicity; organic solvents ID POLYCYCLIC AROMATIC-HYDROCARBONS; PEROXIDASE-ACTIVITY; BIOCATALYTIC OXIDATION; CYTOCHROME-C; SOLVENTS; WATER; MYOGLOBIN AB Carboxylic groups of heme prosthetic group from hemoglobin were modified with p-nitrophenol and p-aminophenol, using a carbodiimide chemistry, to change its electron character and to increase its hydrophobicity. The modification of heme group included the extraction of heme group by the method of acid acetone, the chemical modification of protoporphyrin IX and the reincorporation of modified heme group in apohemoglobin. The effect of the chemical modification on substrate affinity and catalytic activity were studied. Dissociation constants in aqueous media using different substrates showed that chemical modification of hemoglobin active-site improved the substrate affinity up to 30 times. In addition, the chemical modification slightly increased the solvent concentration at which hemoglobin was catalytically active. This biocatalytic behavior could be attributed to the hydrophobicity increase of active site. On the other hand, the chemical modification of the heme prosthetic Zyroup altered its electron balance affecting the specific activity of hemoglobin. P (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Mexicano Petr, Dept Biotechnol, Programa Biotecnol, Mexico City 07730, DF, Mexico. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Biotechnol, Cuernavaca 62250, Morelos, Mexico. RP Torres, E, Inst Mexicano Petr, Dept Biotechnol, Programa Biotecnol, Eje Cent Lazaro Cardenas 152,Delgacion Gustava A, Mexico City 07730, DF, Mexico. CR ASCOLI F, 1981, METHOD ENZYMOL, V76, P72 HAYASHI T, 1999, J AM CHEM SOC, V121, P7747 KHMELNITSKY YL, 1999, CURR OPIN CHEM BIOL, V3, P47 KLIBANOV AM, 1997, TRENDS BIOTECHNOL, V15, P97 MODI S, 1995, BIOCHEM J, V310, P939 MONZANI E, 2000, BIOCHEMISTRY-US, V39, P9571 ORTIZLEON M, 1995, BIOCHEM BIOPH RES CO, V215, P968 RICEEVANS CA, 1991, TECHNIQUES FREE RADI RYABOV AD, 1999, CHEM-EUR J, V5, P961 TAKAHASHI K, 1986, BIOCHEM BIOPH RES CO, V138, P283 TINOCO R, 1998, ENZYME MICROB TECH, V22, P8 TORRES E, 1996, J BIOTECHNOL, V49, P59 TORRES E, 1998, J MOL CATAL B-ENZYM, V4, P155 TORRES E, 2000, BIOCHEM BIOPH RES CO, V273, P820 NR 14 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1381-1177 J9 J MOL CATAL B-ENZYM JI J. Mol. Catal. B-Enzym. PD DEC 2 PY 2002 VL 19 SI Sp. Iss. SI BP 437 EP 441 PG 5 SC Chemistry, Physical; Biochemistry & Molecular Biology GA 618VK UT ISI:000179437800052 ER PT J AU Kussul, E Baidyk, T Ruiz-Huerta, L Caballero-Ruiz, A Velasco, G Kasatkina, L TI Development of micromachine tool prototypes for microfactories SO JOURNAL OF MICROMECHANICS AND MICROENGINEERING LA English DT Article ID MICRO-HEAT-EXCHANGERS; ACTUATORS AB At present, many areas of industry have strong tendencies towards miniaturization of products. Mechanical components of these products as a rule are manufactured using conventional large-scale equipment or micromechanical equipment based on microelectronic technology (MEMS). The first method has some drawbacks because conventional large-scale equipment consumes much energy, space and material. The second method seems to be more advanced but has some limitations, for example, two-dimensional (213) or 2.5-dimensional shapes of components and materials compatible with silicon technology. In this paper, we consider an alternative technology of micromechanical device production. This technology is based on micromachine tools (MMT) and microassembly devices, which can be produced as sequential generations of microequipment. The first generation can be produced by conventional large-scale equipment. The machine tools of this generation can have overall sizes of 100-200 mm. Using microequipment of this generation, second generation microequipment having smaller overall sizes can be produced. This process can be repeated to produce generations of micromachine tools having overall sizes of some millimetres. In this paper we describe the efforts and some results of first generation microequipment prototyping. A micromachining centre having an overall size of 130 x 160 x 85 mm(3) was produced and characterized. This centre has allowed us to manufacture micromechanical details having sizes from 50 mum to 5 mm. These details have complex three-dimensional shapes (for example, screw, gear, graduated shaft, conic details, etc), and are made from different materials, such as brass, steel, different plastics etc. We have started to investigate and to make prototypes of the assembly microdevices controlled by a computer vision system. In this paper we also describe an example of the applications (microfilters) for the proposed technology. C1 Natl Autonomous Univ Mexico, Ctr Instruments, Mexico City 04510, DF, Mexico. Natl Acad Sci Ukraine, Int Res & Training Ctr Informat Technol & Syst, UA-03680 Kiev, Ukraine. RP Kussul, E, Natl Autonomous Univ Mexico, Ctr Instruments, Cd Univ,AP 70-186, Mexico City 04510, DF, Mexico. CR 1996, ATIP96021 BAIDYK TN, 2001, P INT C ADV INTELLIG, P488 BIER W, 1993, CHEM ENG PROCESS, V32, P33 BLEULER H, 2000, P 2000 IEEE INT C RO, P959 BROWN ER, 1998, IEEE T MICROW THEO 2, V46, P1868 CAPRI G, 1998, INT S MICR HUM SCI, P231 CIBUZAR G, 1997, P UNIV GOVT IND MICR, P145 COMTOIS JH, 1998, IEEE LEOS SUMM TOP M DOHI T, 1995, P 6 INT S MICR MACH, P21 EDDY DS, 1998, P IEEE, V86, P1747 FLORUSSEN GHJ, 2001, MEASUREMENT, V30, P241 FRIEDRICH CR, 1994, PRECIS ENG, V16, P56 FRIEDRICH CR, 1996, J MICROELECTROMECH S, V5, P33 FUJITA H, 1998, P IEEE, V86, P1721 FUKUDA T, 1998, MICRO MECH SYSTEMS P ISHIHARA H, 1996, IEEE-ASME T MECH, V1, P68 ISHIKAWA Y, 1997, INT S MICR HUM SCI, P13 JANSON S, 1998, AER C IEEE, V1, P409 JOHNSON MD, 1999, P 13 BIENN U GOV IND, P158 KATSURA S, 1997, 32 IAS ANN M IAS 97, V3, P1983 KUSSUL E, 2001, C SOMI 16 KUSSUL EM, 1996, J MICROMECH MICROENG, V6, P410 KUWANO H, 1996, P 7 INT S MICR MACH, P21 MADNI AM, 1998, AER C IEEE, V1, P421 MAEKAWA H, 2001, P 2001 IEEE INT C RO, P1444 MAZUZAWA T, 1991, P 2 INT S MICR MACH, P47 MCCORMICK FB, 1998, IEEE LEOS SUMM TOP M MINOR RR, 1998, POS LOC NAV S IEEE, P602 NAOTAKE O, 2000, P 2 INT WORKSH MICR, P14 NORVELL BR, 1999, AER C 1999 P, V3, P239 OHLCKERS P, 1995, J MICROMECH MICROENG, V5, P47 OHLCKERS P, 1997, IEEE C ASS CONN MICR OKAZAKI Y, 2000, P 2 INT WORKSH MICR, P87 PILLANS B, 1999, IEEE MICROW GUIDED W, V9, P520 RACHKOVSKIJ DA, 1998, MICROSYST TECHNOL, V4, P151 RAICHOUNDHURY P, 1997, HDB MICROLITHOGRAPHY, V2 REBEIZ GM, 2001, IEEE MICROW MAG, V2, P59 SUN L, 1998, INT S MICR HUM SCI, P243 TAI YC, 1997, P 1997 INT S MICR HU, P21 TANG TK, 1997, 10 ANN INT WORKSH ME, P500 TRIMMER WS, 1997, MICROMECHANICS MEMS, P701 WU HD, 1998, 1998 IEEE MTT S INT, V1, P127 WU S, 1999, 12 IEEE INT C MICR E, P171 YAMAGATA Y, 1995, P 8 INT PREC ENG SEM, P467 YANG X, 1998, P 11 ANN INT WORKSH, P137 NR 45 TC 4 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0960-1317 J9 J MICROMECHANIC MICROENGINEER JI J. Micromech. Microeng. PD NOV PY 2002 VL 12 IS 6 BP 795 EP 812 PG 18 SC Materials Science, Multidisciplinary; Instruments & Instrumentation; Mechanics GA 620AM UT ISI:000179510600011 ER PT J AU Verde-Star, L Srivastava, HM TI Some binomial formulas of the generalized Appell form SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article DE binomial formulas; appell generating-functions; Newton polynomials; q-exponential function; generalized Stirling numbers; q-binomial formula; divided difference functionals; recurrence relations; difference (and q-derivative) operators ID STIRLING NUMBERS AB The authors aim here at finding all the generalizations of the binomial formula that are given by a generating-function of the generalized Appell form for a sequence of Newton polynomials. The formulas obtained include the well-known q-analogue of the binomial formula, several formulas involving hyperbolic functions, a trigonometric analogue, and some formulas involving the geometric and the exponential series. (C) 2002 Elsevier Science (USA). All rights reserved. C1 Univ Victoria, Dept Math & Stat, Victoria, BC V8W 3P4, Canada. Univ Autonoma Metropolitana Iztapalapa, Dept Matemat, Mexico City 09340, DF, Mexico. RP Srivastava, HM, Univ Victoria, Dept Math & Stat, Victoria, BC V8W 3P4, Canada. CR ANDREWS GE, 1976, THEORY PARTITIONS BICKEL T, 2001, ADV APPL MATH, V26, P1 BOAS RP, 1958, POLYNOMIAL EXPANSION DEMEDICIS A, 1995, CAN J MATH, V47, P474 DIBUCCHIANICO A, 1996, J MATH ANAL APPL, V199, P39 GASPER G, 1990, BASIC HYPERGEOMETRIC HSU LC, 1998, ADV APPL MATH, V20, P366 KLAZAR M, 2000, EUR J COMBIN, V21, P367 LOEB DE, 1992, DISCRETE MATH, V103, P259 RIORDAN J, 1968, COMBINATORIAL INDENT SRIVASTAVA HM, 1982, ANN MAT PUR APPL, V130, P321 SRIVASTAVA HM, 1984, TREATISE GENERATING VERDESTAR L, 1991, STUD APPL MATH, V85, P215 VERDESTAR L, 1997, P ICAOR 1996, V1, P11 WAGNER CG, 1996, DISCRETE MATH, V160, P199 NR 15 TC 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD OCT 15 PY 2002 VL 274 IS 2 BP 755 EP 771 PG 17 SC Mathematics, Applied; Mathematics GA 618XK UT ISI:000179442700020 ER PT J AU Cancino-Diaz, JC Reyes-Maldonado, E Banuelos-Panuco, CA Jimenez-Zamudio, L Garcia-Latorre, E Leon-Dorantes, G Blancas-Gonzalez, F Paredes-Cabrera, G Cancino-Diaz, ME TI Interleukin-13 receptor in psoriatic keratinocytes: Overexpression of the mRNA and underexpression of the protein SO JOURNAL OF INVESTIGATIVE DERMATOLOGY LA English DT Article DE interleukin-13; receptor psoriasis; kerationocytes; IL-13 ID NITRIC-OXIDE SYNTHASE; NECROSIS-FACTOR-ALPHA; CD4(+) T-CELLS; IL-13 RECEPTOR; MESSENGER-RNA; DIFFERENTIAL DISPLAY; CYTOKINE EXPRESSION; ENDOTHELIAL-CELLS; GROWTH-FACTOR; SKIN-LESIONS AB Although several cytokines and their receptors have been involved in the development of psoriasis, the etiology is still unknown. In this study we looked for genes possibly involved in the disease by the reverse transcription-polymerase chain reaction differential display technique in lesional and nonlesional skin biopsies from psoriatic patients. We found the mRNA of the alpha1 chain of the interleukin-13 receptor expressed differentially in psoriatic biopsies. By reverse transcription-polymerase chain reaction, we confirmed an overexpression of the alpha1 chain of the IL-13 receptor and alpha chain of the interleukin-4 receptor mRNA in lesional skin psoriatic biopsies, when compared with skin biopsies from healthy subjects (p<0.01). The nonlesional skin obtained from a region close to a lesional zone in psoriatic patients presented also an overexpression of these mRNA in 50% of the samples. Interleukin-13 and interleukin-4 were not detected either as mRNA or as the proteins in any of the biopsies from psoriatic patients or healthy subjects. A monoclonal antibody to the α1 chain of the interleukin-13 receptor detected the receptor in the epidermal keratinocytes of psoriatic patients and of healthy subjects; however, the positive antibody reaction was stronger in skin tissue from healthy subjects than in psoriatic lesional skin tissue (p<0.01), although the mRNA was overexpressed. As interleukin-13 is a pleiotropic immunoregulatory cytokine with a variety of effects on different cell types, including monocytes, B lymphocytes, mast cells, and keratinocytes, we suggest, based on our results, that the interleukin-13 receptor possibly plays an important part in the early inflammatory process of psoriasis; however, its function is lost in the psoriatic keratinocytes. C1 Inst Politecn Nacl, Dept Inmunol, Escuela Nacl Ciencias Biol, Mexico City 11340, DF, Mexico. Hosp Gen Mexico SSA, Serv Dermatol, Mexico City, DF, Mexico. RP Cancino-Diaz, ME, San Bartolo Naucalpan 86,Edificio N2,Dept 7, Mexico City 11270, DF, Mexico. CR AKAIWA M, 2001, CYTOKINE, V13, P75 ALTSCHUL SF, 1990, J MOL BIOL, V215, P403 BAADSGAARD O, 1990, J INVEST DERMATOL, V95, P275 BLUMBERG H, 2001, CELL, V104, P9 BOZZA M, 2001, J INTERF CYTOK RES, V21, P21 BROWN CA, 1990, EXP CELL RES, V190, P233 BRUCHGERHARZ D, 1996, J EXP MED, V184, P2007 DAVID M, 2001, ONCOGENE, V20, P6660 DEROCQ JM, 1994, FEBS LETT, V343, P32 DEWAALMALEFYT R, 1993, J IMMUNOL, V151, P6370 DISEPIO D, 1998, P NATL ACAD SCI USA, V95, P14811 DOUCET C, 1998, INT IMMUNOL, V10, P1421 GOCHT A, 2000, HISTOCHEM J, V32, P447 GUNTER MA, 1997, J IMMUNOL, V159, P6291 HILTON DJ, 1996, P NATL ACAD SCI USA, V93, P49750 HONG K, 1999, J IMMUNOL, V162, P7480 HUANG BB, 2001, J INVEST DERMATOL, V116, P305 KAMALATI T, 1989, DEVELOPMENT, V106, P283 KAWAKAMI K, 2001, BLOOD, V97, P2673 KOCK A, 1990, J EXP MED, V172, P1609 KOLBBACHOFEN V, 1994, LANCET, V344, P139 KOLIOS G, 1996, BRIT J PHARMACOL, V119, P351 KOTOWICZ K, 1996, INT IMMUNOL, V8, P1915 KUPPER TS, 1986, J EXP MED, V164, P2095 LAMSTER BH, 1995, CLIN EXP IMMUNOL, V99, P148 LIANG P, 1992, SCIENCE, V257, P967 LUGER TA, 1990, J INVEST DERMATOL, V95, P100 LUGLI SM, 1997, J BIOL CHEM, V272, P5487 MINTY A, 1993, NATURE, V362, P248 MURATA T, 1997, BIOCHEM BIOPH RES CO, V238, P90 NEUNER P, 1991, J INVEST DERMATOL, V97, P27 NICKOLOFF BJ, 1991, ARCH DERMATOL, V127, P871 NICKOLOFF BJ, 1994, CLIN IMMUNOL IMMUNOP, V73, P63 NICKOLOFF BJ, 1999, ARCH DERMATOL, V135, P1104 OKEEFE EJ, 1988, J INVEST DERMATOL, V90, P767 OLANIRAN AK, 1996, ARCH DERMATOL RES, V288, P421 OSAWA M, 2000, IMMUNOGENETICS, V51, P974 PRENS E, 1996, AM J PATHOL, V148, P1493 RIVAS MV, 1997, J INVEST DERMATOL, V108, P188 RUCKERT R, 2000, J IMMUNOL, V165, P2240 SCHON MP, 1997, NAT MED, V3, P183 SCHULZ BS, 1993, J IMMUNOL, V151, P4399 SERVE H, 1996, CANCER RES, V56, P3583 SKOV L, 1997, AM J PATHOL, V150, P675 TEUNISSEN MBM, 1997, CLIN EXP IMMUNOL, V107, P213 TEUNISSEN MBM, 1998, J INVEST DERMATOL, V111, P645 THOMAS PS, 1980, P NATL ACAD SCI USA, V77, P5201 TREPICCHIO WL, 1999, J CLIN INVEST, V104, P1527 TRINCHIERI G, 1998, INT REV IMMUNOL, V16, P365 TURKA LA, 1995, MOL MED, V1, P690 UMESHITASUYAMA R, 2000, INT IMMUNOL, V12, P1499 UYEMURA K, 1993, J INVEST DERMATOL, V101, P701 WAKUGAWA M, 2001, DERMATOLOGY, V202, P239 YAWALKAR N, 1998, J INVEST DERMATOL, V111, P1053 NR 54 TC 3 PU BLACKWELL PUBLISHING INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0022-202X J9 J INVEST DERMATOL JI J. Invest. Dermatol. PD NOV PY 2002 VL 119 IS 5 BP 1114 EP 1120 PG 7 SC Dermatology GA 618GW UT ISI:000179411200021 ER PT J AU Quiroz, SC Bucio, L Souza, V Hernandez, E Gonzalez, E Gomez-Quiroz, L Kershenobich, D Vargas-Vorackova, F Gutierrez-Ruiz, MC TI Effect of endotoxin pretreatment on hepatic stellate cell response to ethanol and acetaldehyde SO JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY LA English DT Article DE acetaldehyde; alcohol; collagen; cytokines; endotoxin; hepatic stellate cells ID TUMOR-NECROSIS-FACTOR; GROWTH-FACTOR-BETA; COLLAGEN-SYNTHESIS; LIVER FIBROGENESIS; GENE-EXPRESSION; RAT-LIVER; INTERLEUKIN-6; GLUTATHIONE; PROLIFERATION; TRANSCRIPTION AB Background and Aim: The role of endotoxin in alcohol-induced liver damage is well recognized. How pre-exposure to endotoxin might affect alcohol injury is not known. We herein studied the effect of endotoxin pretreatment on hepatic stellate cell (HSC) response to ethanol and acetaldehyde. Methods: Rat HSC (CFSC-2G) were exposed to media supplemented with 1 mug/mL lipopolysaccharide (LPS). This was followed by a 24 h exposure to media containing LPS plus 50 mmol/L ethanol or 175 mumol/L acetaldehyde. Lipid peroxidation, collagen, and tumor necrosis factor (TNF)-alpha interleukin (IL)-1beta, IL-6 and transforming growth factor (TGF)-beta(1) secretion were determined at the end of both periods of exposure. Results: Lipopolysaccharide pretreatment did not modify lipid peroxidation induced by ethanol or acetaldehyde alone. Glutathione (GSH) content decreased to 4.2 +/- 0.5 and 16.3 +/- 0.8 nmol protein after exposure to ethanol or acetaldehyde alone, and decreased further with LPS pretreatment (2.4 +/- 0.2 and 2.7 +/- 0.3 nmol/mg protein, respectively). Oxidized GSH (GSSG) content increased in ethanol and acetaldehyde LPS-pretreated cells only. Collagen secretion increased to 988 +/- 82 and 1169 +/- 91 mug/10(6) cells after exposure to acetaldehyde or LPS alone. Lipopolysaccharide pretreatment enhanced collagen secretion significantly in both ethanol- and acetaldehyde-treated cells (969 +/- 56 and 1360 +/- 72 mug/10(6) cells, respectively). Interleukin-6 production increased to 288 +/- 48, 1195 +/- 86 and 247 +/- 35 pg/mL per 10(6) cells after ethanol, acetaldehyde and LPS exposure, and increased further with LPS pretreatment in ethanol-exposed cells (680 +/- 23 pg/mL 10(6) cells). Conclusion: Lipopolysaccharide pretreatment of HSC adds to the damage produced by ethanol and acetaldehyde by diminishing GSH content and increasing GSSG content, collagen and IL-6 secretion. (C) 2001 Blackwell Science Asia Pry Ltd. C1 Univ Autonoma Metropolitana Iztapalapa, Lab Fisiol Celular, Dept Ciencias Salud, DCBS, Mexico City 09340, DF, Mexico. Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Gastroenterol, Mexico City, DF, Mexico. RP Gutierrez-Ruiz, MC, Univ Autonoma Metropolitana Iztapalapa, Lab Fisiol Celular, Dept Ciencias Salud, DCBS, Apdo Postal 55-535, Mexico City 09340, DF, Mexico. CR ADACHI Y, 1995, GASTROENTEROLOGY, V108, P218 BAUTISTA AP, 1996, ALCOHOL CLIN EXP RES, V20, P1395 BISSELL DM, 1995, J CLIN INVEST, V96, P447 BUEGE JA, 1978, METHOD ENZYMOL, V52, P302 DELEVE LD, 1998, SEMIN LIVER DIS, V18, P403 DUNCAN M, 1992, J INVEST DERMATOL, V97, P686 ENDO Y, 1999, BRIT J PHARMACOL, V128, P5 FERNANDEZCHECA JC, 1991, J CLIN INVEST, V87, P397 GREENWEL P, 1993, LAB INVEST, V69, P210 GREENWEL P, 1995, LAB INVEST, V72, P83 HILL D, 1997, CYTOKINES HLTH DIS, P401 INAGAKI Y, 1995, HEPATOLOGY, V22, P573 JARVELAINEN HA, 1999, HEPATOLOGY, V29, P1503 KAMIMURA S, 1995, HEPATOLOGY, V21, P1304 KESHAVARZIAN A, 1999, AM J GASTROENTEROL, V94, P200 KHORUTS A, 1991, HEPATOLOGY, V13, P267 LI D, 1999, J GASTROEN HEPATOL, V14, P618 LIU J, 2000, TOXICOLOGY, V147, P167 LOWRY OH, 1951, J BIOL CHEM, V193, P265 MAHER JJ, 1994, ALCOHOL CLIN EXP RES, V18, P403 MAHER JJ, 1997, HEPATOLOGY, V26, P618 MAO YL, 1996, GASTROENTEROLOGY, V111, P334 MATSUOKA M, 1990, HEPATOLOGY, V11, P599 MOLDEUS P, 1978, METHOD ENZYMOL, V52, P60 NANJI AA, 1994, HEPATOLOGY, V19, P1483 NOLAN JP, 1989, HEPATOLOGY, V10, P887 OLASO E, 1997, HEPATOLOGY, V26, P634 SIMPSON KJ, 1997, J HEPATOL, V27, P1120 SVEGLIATIBARONI G, 1998, HEPATOLOGY, V27, P720 THURMAN RG, 1998, AM J PHYSIOL-GASTR L, V275, G605 TIETZE F, 1969, ANAL BIOCHEM, V27, P502 TIGGELMAN AMB, 1995, J HEPATOL, V23, P307 TSUKAMOTO H, 1999, ALCOHOL CLIN EXP RES, V23, P911 VARELAREY M, 1999, BIOCHEM BIOPH RES CO, V259, P678 WOESSNER JF, 1961, ARCH BIOCHEM BIOPHYS, V93, P440 NR 35 TC 0 PU BLACKWELL PUBLISHING ASIA PI CARLTON PA 54 UNIVERSITY ST, P O BOX 378, CARLTON, VICTORIA 3053, AUSTRALIA SN 0815-9319 J9 J GASTROENTEROL HEPATOL JI J. Gastroenterol. Hepatol. PD NOV PY 2001 VL 16 IS 11 BP 1267 EP 1273 PG 7 SC Gastroenterology & Hepatology GA 619AN UT ISI:000179451000016 ER PT J AU Mujica-Paz, H Valdez-Fragoso, A Lopez-Malo, A Palou, E Welti-Chanes, J TI Impregnation properties of some fruits at vacuum pressure SO JOURNAL OF FOOD ENGINEERING LA English DT Article DE vacuum impregnation; osmotic dehydration; effective porosity; fruits ID OSMOTIC DEHYDRATION; FOOD AB The effects of vacuum pressure and its application time on the volume of isotonic solution (IS) impregnated in slices of mango, apple, papaya, banana, peach, melon, and mamey were studied using response surface methodology. Fruits were subjected to vacuum impregnation (VI) treatments using sucrose IS. VI times between 3 and 45 min and vacuum pressures (VP) between 135 and 674 mbar were applied. Second order polynomials were developed to estimate the volume of IS impregnated in each fruit (R-2 > 0.870). VP had a significant effect (p less than or equal to 0.10) on the volume of IS impregnated in fruit slices of all the studied fruits. The impregnation also depended significantly (p less than or equal to 0.10) on the VI time, except for apple. Under the studied conditions, the effective porosity values of the fruits varied from 0.016 for mamey to 0.330 for apple. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Univ Amer Puebla, Dept Ingn Quim & Alimentos, Puebla, Mexico. Univ Auton Chihuahua, Chihuahua 31170, Mexico. RP Welti-Chanes, J, Univ Amer Puebla, Dept Ingn Quim & Alimentos, Sta Catarina Martir, Puebla, Mexico. CR *AOAC, 1984, OFF METH AN *STAT EAS CORP, 1996, DES EXP ANDRES A, 1995, THESIS U POLITECNICA DEDAZA MST, 1996, CRIT REV FOOD SCI, V36, P629 DEDAZA MST, 1999, FOOD SCI TECHNOLOGY, V5, P43 FAVIER JC, 1995, TECHNIQUE DOCUMENTAT FITO P, 1994, J FOOD ENG, V21, P513 FITO P, 1994, J FOOD ENG, V22, P313 FITO P, 1996, J FOOD ENG, V27, P229 FITO P, 2000, MINIMALLY PROCESSED, P189 GUERRERO ZJM, 1996, THESIS U AM PUEBLA M HULME AC, 1970, BIOCH FRUITS THEIR P MARTINEZMONZO J, 1998, J FOOD SCI, V63, P499 PRIMOYUFERA E, 1982, QUIMICA AGRICOLA, V3 SALVATORI D, 1997, THESIS U POLITECNICA SALVATORI D, 1998, J FOOD PROCESS ENG, V21, P59 SOUSA R, 1996, THESIS U POLITECNICA NR 17 TC 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0260-8774 J9 J FOOD ENG JI J. Food Eng. PD MAR PY 2003 VL 56 IS 4 BP 307 EP 314 PG 8 SC Engineering, Chemical; Food Science & Technology GA 619ZH UT ISI:000179507500002 ER PT J AU Macias, E Castillejos, AH Acosta, FA Herrera, M Neumann, F TI Modelling molten flux layer thickness profiles in compact strip process moulds for continuous thin slab casting SO IRONMAKING & STEELMAKING LA English DT Article ID TURBULENT-FLOW AB The important functions promoted by powdered flux added over the liquid steel surface in continuous casting moulds are strongly affected by the thickness of the liquid layer that forms as a result of the heat absorbed. The present work discusses the results of a three-dimensional steady state model, developed to represent the coupled fluid flow and heat transfer phenomena that determine thickness profiles of the liquid flux layer. Since the laminar flow of the liquid slag layer depends on the shearing imposed on it by the turbulent motion of the liquid steel beneath it, and since additionally this motion is strongly influenced by the flow characteristics of the steel stream poured into the mould through the submerged entry nozzle (SEN), separate turbulent flow models for the liquid steel in the SEN and the mould were also developed. The consistency among the models and their accuracy was judged by comparing thickness and temperature flux profiles measured in plant against predicted ones; the comparison showed good agreement. The effects of casting speed, mould width, and flux viscosity and heat of melting on the liquid layer thickness were investigated. The last variable was found to exert the most marked influence. Different from conventional casting moulds, where the liquid layer thickness increases with increasing casting speed, in compact strip process moulds the thickness remains almost constant with increasing casting speed. This difference is well accounted for by the model, which suggests that this behaviour stems from the different slag flow patterns generated in straight, wide moulds and in thin moulds having a central upper funnel shaped section. C1 Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico. CINVESTAV, Unidad Saltillo, Saltillo 25000, Coahuila, Mexico. HYLSA, SA CV, San Nicolas, NL, Mexico. Met GmbH & Co KG, Mulheim, Germany. RP Macias, E, Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico. CR ABOUTALEBI MR, 1995, METALL MATER TRANS B, V26, P731 ASSAR MB, 2000, ISS STEELM C P, V83, P397 BELVINS D, 2000, IRON STEELMAKER, V27, P85 BILLANY TJH, 1991, IRONMAK STEELMAK, V18, P403 BOMMARAJU R, 1991, ISS STEELMAKING C P, V74, P131 BRANION RV, 1986, IRON STEELMAKER, V13, P41 BRIMACOMBE JK, 1977, METALLURG T B, V8, P489 DELHALLE A, 1987, MOULD POWDERS CONTIN, V6, P15 EMI T, 1983, CONTINUOUS CASTING, V1, P135 GOLDSCHMIT MB, 1993, IRONMAK STEELMAK, V20, P379 JONES WP, 1972, INT J HEAT MASS TRAN, V15, P301 KOYAMA K, 1987, NIPPON STEEL TECH RE, V34, P41 LAUNDER BE, 1974, COMPUTER METHODS APP, V3, P269 LEE IR, 1988, ISS STEELM C P, V71, P175 MACIAS E, 2002, THESIS CINVESTAV UNI MCDAVID RM, 1996, METALL MATER TRANS B, V27, P672 MILLS KC, 1990, 17 DMMD NAT PHYS LAB, P1 NAJJAR FM, 1995, METALL MATER TRANS B, V26, P749 NAKANO T, 1987, NIPPON STEEL TECHNIC, V34, P21 NEAL J, 1995, COMMUNICATION 1108 NEUMANN F, 1995, COMMUNICATION 1108 NEUMANN F, 1996, STEEL PROC, V79, P249 OGIBAYASHI S, 1987, NIPPON STEEL TECH RE, V34, P1 PADILLA RS, 1998, COMMUNICATION SEP PINHEIRO CA, 1994, IRON STEELMAKER, V21, P55 PINHEIRO CA, 1994, IRON STEELMAKER, V21, P62 PINHEIRO CA, 1995, IRON STEELMAKER, V22, P41 ROSTEN HI, 1996, PHOENICS SOFTWARE VE SANTOS R, 1997, THESIS CINVESTAV UNI SCHEEL R, 1987, METALL PLANT TECHNOL, V6, P22 SOWA C, 2000, COMMUNICATION 1121 XIE B, 1991, ISS STEELM C P, V74, P647 NR 32 TC 2 PU MANEY PUBLISHING PI LEEDS PA HUDSON RD, LEEDS LS9 7DL, ENGLAND SN 0301-9233 J9 IRONMAKING STEELMAKING JI Ironmak. Steelmak. PD OCT PY 2002 VL 29 IS 5 BP 347 EP 358 PG 12 SC Metallurgy & Metallurgical Engineering GA 617XL UT ISI:000179386200004 ER PT J AU Robinson, M Kochekseraii, SB TI Parametric survey of upper and lower bound limit in-plane bending moments for single mitred pipe bends of various geometries SO INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING LA English DT Article DE shell limit analysis; lower bound limit moments; finite element; ABAQUS AB The problem of limit analysis for a cylinder-cylinder intersection forming a single mitred pipe bend subject to in-plane bending has been investigated. Lower bound analysis with new equations of force and moment equilibrium together with a higher number of parameters resulted in more stability as compared to a previous analysis of the same problem [PhD Thesis, The University of Manchester, 1991]. Concurrently, ABAQUS finite element plastic collapse moments were obtained as upper bounds to the problem. Two sets of results were compared, showing good agreement with each other. It could be finally concluded that the true limit moments are bounded in between. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 ITESM, Dept Engn Mech, Mexico City 52926, DF, Mexico. UMIST, Dept Engn Mech, Manchester M60 IQD, Lancs, England. RP Kochekseraii, SB, ITESM, Dept Engn Mech, Campus Estado Mexico, Mexico City 52926, DF, Mexico. CR BIRON A, 1972, INT J MECH SCI, V14, P25 BIRON A, 1976, NUCL ENG DES, V36, P68 CARROL CW, 1961, OPER RES, V9, P165 FLETCHER C, 1980, PRACTICAL METHODS OP HODGE PG, 1963, INT SERIES THEORETIC KITCHING R, 1989, INT J PRESSURE VESSE, V38, P129 KOCHEKSERAII SB, 1994, THESIS UMIST MURRAY NW, 1972, CIVIL ENG T I ENG AU, V14, P201 RAHIMI GH, 1991, THESIS U MANCHESTER ROBINSON M, 1971, INT J MECH SCI, V13, P345 ROBINSON M, 1972, INT J MECH SCI, V14, P579 ROBINSON M, 1978, T ASME, V100, P65 SO HS, 1971, THESIS U MANCHESTER NR 13 TC 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0308-0161 J9 INT J PRESSURE VESSELS PIPING JI Int. J. Pressure Vessels Pip. PD NOV PY 2002 VL 79 IS 11 BP 735 EP 740 PG 6 SC Engineering, Mechanical; Engineering, Multidisciplinary GA 619RK UT ISI:000179490000002 ER PT J AU Becker, D Garcia, SG Larsen, U TI Knowledge and opinions about abortion law among Mexican youth SO INTERNATIONAL FAMILY PLANNING PERSPECTIVES LA English DT Article AB CONTEXT: Mexican states' abortion laws vary, but in all states and the Federal District induced abortions are legal in some circumstances. Public knowledge and opinions about abortion laws affect access to safe services. METHODS: Survey data from a nationally representative sample of 907 men and women aged 15-24 in 2000 were analyzed to explore knowledge and opinion about abortion laws. Logistic regression was used to identify factors associated with participants' knowing that abortions are sometimes legal in their state and with participants' attitudes toward abortion. RESULTS: Fifty-four percent of participants did not know the legal status of abortion in their state. Of these, 82% believed that abortion is never legal, and the rest did not know or thought that it is always legal. The odds of having correct information were reduced for respondents with low levels of education, those living in certain regions outside Mexico City and rural residents (odds ratios, 0.3-0.7); they were elevated among those with liberal attitudes toward emergency contraceptive pills (2.2). Some 70-83% of participants supported legal abortions when pregnancies result from rape or endanger a woman's life or health. Only 11-22% supported legal abortions for single women or minors, those with economic constraints and women who experience contraceptive failure. Low education and conservative attitudes toward emergency contraceptive pills were associated with conservative attitudes toward abortion. Knowing that abortion is sometimes legal did not affect opinion about it CONCLUSIONS: Understanding young people's knowledge and opinions about abortion may help in designing programs to reduce the problem of unsafe abortion in Mexico. C1 Populat Council, Reg Off Latin Amer & Caribbean, Mexico City, DF, Mexico. Harvard Univ, Sch Publ Hlth, Dept Populat & Int Hlth, Cambridge, MA 02138 USA. RP Becker, D, Populat Council, Reg Off Latin Amer & Caribbean, Mexico City, DF, Mexico. CR *AGI, 1996, OV CLAND AB LAT AM *AGI, 1999, SHAR RESP WOM SOC AB *CONAPO, 2000, CUAD SAL REPR REP ME *CTR INV EST JUV, 2001, ENC NAC JUV 2000 RES *GIRE, 2000, MIR SOB AB *GRUP IDM POP COUN, 2001, QUE PIENS OP MEX AB *INEGI, 2001, MUJ HOMBR MEX *POP COUNC, 2000, UNPUB ENC NAC OP PUB *SECR SAL, 2002, GDFSSDF0202 SECR SAL *WHO, 1998, UNS AB GLOB REG EST AGUIRRE DGD, 1995, SALUD PUBLICA MEXICO, V37, P248 AGUIRRE DGD, 2001, GENDER DEV, V9, P87 BANKOLE A, 1999, INT FAM PLAN PERSPEC, V25, P68 BERER M, 2000, B WORLD HEALTH ORGAN, V78, P580 DELAGARZAAGUILAR J, 1997, SALUD PUBLICA MEXICO, V39, P539 DEWEISS SP, 1990, AM J PUBLIC HEALTH, V80, P715 ELU MD, 1999, ABORTION DEV WORLD, P245 FREJKA T, 1996, FERTILITY TRANSITION, P179 GAGE AJ, 1998, STUD FAMILY PLANN, V29, P154 HENSHAW SK, 1999, INT FAMILY PLANNING, V25, P30 HOSME RDW, 2000, APPL LOGISTIC REGRES LAMAS M, 2000, REPROD HEALTH MATTER, V8, P10 LANGER A, 1997, REPROD HEALTH MATTER, V5, P20 LARA D, 2001, 6 LAT AM C SOC SCI H MARSIGLIO W, 1993, FAM PLANN PERSPECT, V25, P162 PAXMAN JM, 1993, STUD FAMILY PLANN, V24, P205 PONIATOWSKA E, 2000, MIL UNA HERIDA PAULI NR 27 TC 1 PU ALAN GUTTMACHER INST PI NEW YORK PA 120 WALL STREET, NEW YORK, NY 10005 USA SN 0190-3187 J9 INT FAM PLAN PERSPECT JI Int. Fam. Plan. Perspect. PD DEC PY 2002 VL 28 IS 4 BP 205 EP 213 PG 9 SC Demography; Family Studies GA 619HP UT ISI:000179470800003 ER PT J AU Poznyak, AS Najim, K TI Learning through reinforcement for N-person repeated constrained games SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS LA English DT Article DE adaptive strategies; learning automata (LA); reinforcement learning; repeated game ID NASH EQUILIBRIUM; DYNAMICS AB The design and analysis of an adaptive strategy for N-person averaged constrained stochastic repeated game are addressed. Each player is modeled by a stochastic variable-structure learning automaton. Some constraints are imposed on some functions of the probabilities governing the selection of the player's actions. After each stage, the payoff to each player as well as the constraints are random variables. No information concerning the parameters of the game is a priori available. The "diagonal concavity" conditions are assumed to be fulfilled to guarantee the existence and uniqueness of the Nash equilibrium. The suggested, adaptive strategy which uses only the current realizations (outcomes and constraints) of the game, is based on the Bush-Mosteller reinforcement scheme in connection with a normalization procedure. The, Lagrange multipliers approach with a regularization is used. The asymptotic properties of this algorithm are analyzed. Simulation results illustrate the feasibility and the performance of this adaptive strategy. C1 IPN, CINVESTAV, Dept Control Automat, Mexico City 07300, DF, Mexico. ENSIGC, Proc Control Lab, F-31078 Toulouse, France. RP Poznyak, AS, IPN, CINVESTAV, Dept Control Automat, Mexico City 07300, DF, Mexico. 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Syst. Man Cybern. Part B-Cybern. PD DEC PY 2002 VL 32 IS 6 BP 759 EP 771 PG 13 SC Computer Science, Artificial Intelligence; Computer Science, Cybernetics; Automation & Control Systems GA 618YC UT ISI:000179444900006 ER PT J AU Castillo, O Melin, P TI Hybrid intelligent systems for time series prediction using neural networks, fuzzy logic, and fractal theory SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Article DE fractal theory; fuzzy logic; neural networks; time series prediction AB In this paper, we describe a new method for the estimation of the fractal dimension of a geometrical object using fuzzy logic techniques. The fractal dimension is a mathematical concept, which measures the geometrical complexity of an object. The algorithms for estimating the fractal dimension calculate a numerical value using as data a time series for the specific problem. This numerical (crisp) value gives an idea of the complexity of the geometrical object (or time series). However, there is an underlying uncertainty in the estimation of the fractal dimension because we use only a sample of points of the object, and also because the numerical algorithms for the fractal dimension are not completely accurate. For this reason, we have proposed a new definition of the fractal dimension that incorporates the concept of a fuzzy set. This new definition can be considered a weaker definition (but more realistic) of the fractal dimension, and we have named this the "fuzzy fractal dimension." We can apply this new definition of the fractal dimension in conjunction with soft computing techniques for the problem of time series prediction. We have developed hybrid intelligent systems combining neural networks, fuzzy logic, and the fractal dimension, for the problem of time series prediction, and we have achieved very good results. C1 Tijuana Inst Technol, Comp Sci Dept, Tijuana 22500, Mexico. RP Castillo, O, Tijuana Inst Technol, Comp Sci Dept, Tijuana 22500, Mexico. 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Neural Netw. PD NOV PY 2002 VL 13 IS 6 BP 1395 EP 1408 PG 14 SC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic GA 618JX UT ISI:000179415900012 ER PT J AU Marroquin, JL Vemuri, BC Botello, S Calderon, F Fernandez-Bouzas, A TI An accurate and efficient Bayesian method for automatic segmentation of brain MRI SO IEEE TRANSACTIONS ON MEDICAL IMAGING LA English DT Article DE Bayes procedures; biomedical magnetic resonance imaging; hidden Markov models; image registration; image segmentation ID IMAGES; ALGORITHM; FIELD; RECONSTRUCTION; PARALLEL; VISION AB Automatic three-dimensional (3-D) segmentation of the brain from magnetic resonance (MR) scans is a challenging problem that has received an enormous amount of attention lately. Of the techniques reported in the literature, very few are fully automatic. In this paper, we present an efficient and accurate, fully automatic 3-D segmentation procedure for brain MR scans. It has several salient features; namely, the following. 1) Instead of a single multiplicative bias field that affects all tissue intensities, separate parametric smooth models are used for the intensity of each class. 2) A brain atlas is used in conjunction with a robust registration procedure to find a nonrigid transformation that maps the standard brain to the specimen to be segmented. This transformation is then used to: segment the brain from nonbrain tissue; compute prior probabilities for each class at each voxel location and find an appropriate automatic initialization. 3) Finally, a novel algorithm is presented which is a variant of the expectation-maximization procedure, that incorporates a fast and accurate way to find optimal segmentations, given the intensity models along with the spatial coherence assumption. Experimental results with both synthetic and real data are included, as well as comparisons of the performance of our algorithm with that of other published methods. C1 Univ Florida, Dept Comp & Informat Sci & Engn, Gainesville, FL 32611 USA. Univ Michoacana San Nicolas de Hidalgo, Fac Ingn Elect, Div Estud Posgrado, Morelia, Michoacan, Mexico. Ctr Invest Matemat, Guangjuato 36000, Mexico. UNAM, Ctr Neurobiol, Juriquilla 76001, Qro, Mexico. RP Vemuri, BC, Univ Florida, Dept Comp & Informat Sci & Engn, Gainesville, FL 32611 USA. 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Med. Imaging PD AUG PY 2002 VL 21 IS 8 BP 934 EP 945 PG 12 SC Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Engineering, Electrical & Electronic; Radiology, Nuclear Medicine & Medical Imaging; Imaging Science & Photographic Technology GA 619XH UT ISI:000179502400009 ER PT J AU Psenicka, B Garcia-Ugalde, F Heirera-Camacho, A TI The bilinear Z transform by pascal matrix and its application in the design of digital filters SO IEEE SIGNAL PROCESSING LETTERS LA English DT Article DE filter design; Pascal matrix; structures; z transformation AB In this letter, the Pascal matrix is used for transforming the normalized analog transfer function H(s) from the lowpass to the lowpass and highpass discrete transfer functions H(z). This algorithm is very simple; therefore, the transfer function H (, s) can be easily transformed to the z domain using an appropriate calculator. The inverse Pascal matrix can be obtained without computing the determinant of the system, and then it is very easy to obtain the associated analog transfer function H(8) if the discrete transfer function H(z) is known. C1 Univ Nacl Autonoma Mexico, Fac Ingn, Dept Telecommun, Mexico City 04510, DF, Mexico. RP Psenicka, B, Univ Nacl Autonoma Mexico, Fac Ingn, Dept Telecommun, Ciudad Univ, Mexico City 04510, DF, Mexico. CR BIOLKOVA V, 1999, P ICECS PAF CYPR KLEIN W, 1976, FINITE SYSTEMTHEORIE PARKS TW, 1987, DIGITAL FILTER DESIG RABINER R, 1975, THEORY APPL DIG SIGN NR 4 TC 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1070-9908 J9 IEEE SIGNAL PROCESS LETT JI IEEE Signal Process. Lett. PD NOV PY 2002 VL 9 IS 11 BP 368 EP 370 PG 3 SC Engineering, Electrical & Electronic GA 618YY UT ISI:000179446800008 ER PT J AU Kotov, AA Paggi, JC Elias-Gutierrez, M TI Redescription of Ilyocryptus brevidentatus Ekman, 1905 (Anomopoda, Cladocera, Branchiopoda) SO HYDROBIOLOGIA LA English DT Article DE Cladocera; Anomopoda; Ilyocryptus; systematics; redescription; South America; Subantarctic islands ID SUB-ANTARCTIC ISLANDS; CHYDORIDAE; ARGENTINA AB The morphology of Ilyocryptus brevidentatus Ekman, 1905 is redescribed based on the syntypes from Falklands and South Georgia, and additional material from Signy Island and southern portion of Chile and Argentina. It is not possible to select a lectotype, and specify the exact type locality, because Ekman, or a subsequent investigator, mixed all specimens from all localities in one tube. A series of unique traits in the thoracic limbs of this species was revealed. A preliminary key for the discrimination of all adequately studied species of Ilyocryptus based exclusively on characters of their limbs is proposed. All Australian records of I. brevidentatus seem to apply to other species, superficially similar to it. C1 Colegio Frontera Sur, Chetumal 77000, Quintana Roo, Mexico. AN Severtsov Inst Ecol & Evolut, Moscow 117071, Russia. Inst Nacl Limnol, RA-3016 Santo Tome, S Fe, Argentina. RP Kotov, AA, Colegio Frontera Sur, Km 2 Carretera Chetumal Bacalar,Zona Ind 2, Chetumal 77000, Quintana Roo, Mexico. CR ALONSO M, 1996, FAUNA IBERICA CRUSTA CERVANTESMARTINEZ A, 2000, CRUSTACEANA 3, V73, P311 DUMONT HJ, 1996, HYDROBIOLOGIA, V325, P83 EKMAN S, 1905, WISS ERGEBN SCHWED S, V5, P1 FREY DG, 1988, LIMNOL OCEANOGR, V33, P1386 FREY DG, 1993, HYDROBIOLOGIA, V262, P145 HEYWOOD RB, 1967, PHIL T R SOC LOND B, V252, P347 KOTOV AA, 1998, HYDROBIOLOGIA, V380, P127 KOTOV AA, 1999, ARTHROPODA SELECTA, V8, P3 KOTOV AA, 2000, HYDROBIOLOGIA, V428, P115 KOTOV AA, 2000, HYDROBIOLOGIA, V428, P67 KOTOV AA, 2000, HYDROBIOLOGIA, V428, P85 KOTOV AA, 2002, HYDROBIOLOGIA, V472, P141 KOTOV AA, 2002, HYDROBIOLOGIA, V472, P207 OLIVIER SR, 1962, REV MUS PLATA ZOOL, V7, P173 PAGGI JC, 1987, DIR NAT ANTARCT CONT, V338, P1 PAGGI JC, 1989, HYDROBIOLOGIA, V182, P239 PAGGI JC, 1992, HYDROBIOLOGIA, V231, P141 PAGGI JC, 1993, C LIMN I LIMN RA RIN, P107 PAGGI JC, 1998, BIODIVERSIDAD ARTROP, P507 PUGH PJA, 2002, J NAT HIST, V36, P1047 SARS GO, 1909, ARCH MATH NATURVIDEN, V30, P14 SHIEL RJ, T R SOC S AUST, V119, P29 SMIRNOV NN, 1971, FAUNA SSSR R, V1, P1 SMIRNOV NN, 1976, FAUNA SSSR RAKOOBRAZ, V1, P1 SMIRNOV NN, 1983, REC AUST MUS S, V1, P1 SMIRNOV NN, 1995, ARTHROPODA SELECTA, V4, P3 STIFTER P, 1988, VEST CESK SPOL ZOOL, V52, P290 NR 28 TC 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0018-8158 J9 HYDROBIOLOGIA JI Hydrobiologia PD AUG PY 2002 VL 481 IS 1-3 BP 1 EP 18 PG 18 SC Marine & Freshwater Biology GA 617XZ UT ISI:000179387400001 ER PT J AU Sarma, SSS Nandini, S Gulati, RD TI Cost of reproduction in selected species of zooplankton (rotifers and cladocerans) SO HYDROBIOLOGIA LA English DT Article DE demography; reproductive cost; survival cost; rotifers; cladocerans; correlation analysis ID LIFE TABLE DEMOGRAPHY; CHLORELLA-VULGARIS; POPULATION-GROWTH; FOOD; DENSITIES; SEX AB Reproduction is an energetically costly biological process. Among the freshwater zooplankton, rotifers and cladocerans reproduce parthenogenetically and the cost of reproduction can be estimated using the life table data from demographic studies. Reduced probability of future survival or future reproduction as a result of current investment in offspring production (trade-off) is the central theme of the cost hypothesis. Correlations using present reproduction vs. future reproduction ( called the reproductive costs) or future survival ( called the survival costs) can be used to evaluate the cost hypothesis. In this work sets of correlations were made: (1) between present reproduction (m(x)) vs. future survival (l(x+1), l(x+2), l(x+3) etc. for the entire lifespan) ( survival costs), and ( 2) present reproduction (m(x)) vs. future reproduction (m(x+1), m(x+2), m(x+3) etc. for the entire reproductive span) ( reproductive costs). These correlations were plotted against the cohort age-classes in order to quantify survival and reproductive costs in rotifers (Asplanchna girodi, Brachionus macracanthus, B. variabilis and Platyias quadricornis) and cladocerans ( Ceriodaphnia cornuta - one strain maintained on Chlorella and another strain adapted to Microcystis), Daphnia carinata, D. laevis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi and Simocephalus vetulus). All the tested rotifer species showed negative tendency in correlation coefficients ( when the data of current reproduction vs. future reproduction and future survival were plotted) for both reproductive and survival costs. However, from the total survival and reproductive costs derived, 84% of the former and 42% of the latter were statistically significant. In cladocerans about 80% of the costs ( correlations between current reproduction vs. future survival or future reproduction) were negative suggesting that present reproduction had negatively affected both the further survival and reproduction of test populations. In terms of statistically significant survival costs, the cladocerans showed a trend slightly lower (72%) but comparable to rotifers. The reproductive costs were significant in 45% cases. In our study, the simple statistical correlations detected the trade-offs between reproduction and survival. Thus, in more than 60% cases of both survival and reproductive costs in zooplankton were negative, and our data supported the cost hypothesis, in the majority of cases where reproduction by zooplankton of a given age class caused reduced survival and reproduction of the next age class. C1 Natl Autonomous Univ Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Unit UMF, Los Reyes 54090, Tlalnepantla, Mexico. Natl Autonomous Univ Mexico, Div Res & Postgrad Studies, CyMA Project, Los Reyes 54090, Tlalnepantla, Mexico. Netherlands Inst Ecol, Ctr Limnol, NL-63631 AC Nieuwersluis, Netherlands. RP Sarma, SSS, Natl Autonomous Univ Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Unit UMF, Campus Iztacala,AP 314, Los Reyes 54090, Tlalnepantla, Mexico. CR BELL G, 1986, COST REPROD OXFORD S BERUBE CH, 1999, ECOLOGY, V80, P2555 DODSON SI, 1991, ECOLOGY CLASSIFICATI, P723 DONCASTER CP, 2000, NATURE, V404, P281 DUMONT HJ, 1995, HYDROBIOLOGIA, V306, P97 ENESCO HE, 1993, HYDROBIOLOGIA, V255, P59 GALKOVSKAYA GA, 1998, POL J ECOL, V46, P187 GILLOOLY JF, 1999, J FISH BIOL, V54, P573 GLAZIER DS, 1992, OECOLOGIA, V90, P540 JOENSSON KI, 1994, TRENDS ECOL EVOL, V9, P304 KING CE, 1982, EVOLUTION GENETICS L, P121 MESSINA FJ, 1999, PHYSIOL ENTOMOL, V24, P358 NANDINI S, 2000, AQUAT ECOL, V34, P227 NANDINI S, 2000, CRUSTACEANA 10, V73, P1273 NANDINI S, 2000, HYDROBIOLOGIA, V435, P117 PENNAK RW, 1989, FRESH WATER INVERTEB RAO TR, 1988, P INDIAN NATN SCI B, V54, P435 REZNICK D, 1985, OIKOS, V44, P257 REZNICK D, 2000, TRENDS ECOL EVOL, V15, P421 REZNICK DN, 1999, SCIENCE, V286, P2458 ROFF DA, 1992, EVOLUTION LIFE HIST SARMA SSS, 1991, INT REV GES HYDROBIO, V76, P225 SARMA SSS, 2001, HYDROBIOLOGIA, V446, P75 SCHEINER SM, 1998, EVOLUTION, V52, P368 SNELL TW, 1977, EVOLUTION, V31, P882 NR 25 TC 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0018-8158 J9 HYDROBIOLOGIA JI Hydrobiologia PD AUG PY 2002 VL 481 IS 1-3 BP 89 EP 99 PG 11 SC Marine & Freshwater Biology GA 617XZ UT ISI:000179387400007 ER PT J AU Cervantes-Martinez, A Elias-Gutieerrez, M Suarez-Morales, E TI Limnological and morphometrical data of eight karstic systems 'cenotes' of the Yucatan Peninsula, Mexico, during the dry season (February-May, 2001) SO HYDROBIOLOGIA LA English DT Article DE biomass; freshwater; production; karst; chlorophyll ID LAKES; ZOOPLANKTON; COMMUNITIES AB The karstic nature of the Yucatan Peninsula allows the formation of natural sink-holes from the dissolution of calcareous rock. These systems are almost the only epigean source of fresh water available in this region. In spite of their biological importance, little is known about the morphometric and limnologic characteristics of these karstic systems. We measured limnological variables in eight cenotes in central Quintana Roo during February-May, 2001. Zooplankton biomass and chlorophyll a were also measured in order to determine if the behavior of primary and secondary production was related to environmental parameters. Important short-term changes were observed in nutrients (NO3-, NO2-, PO43-), biomass, and chlorophyll a. The morphometrically conditioned productivity (MCP), which evaluates the cumulative effect of several morphometric variables on production (area, maximum length, shoreline development, perimeter), showed a negative correlation with respect to zooplankton biomass, as did also both pH and temperature. Conversely, NO3- and NO2- had a positive correlation with zooplankton biomass. No correlation was found for chlorophyll a. Significant differences in NO3- (F = 61.52, p < 0.001), NO2- (F = 7.36, p < 0.001), zooplankton biomass (F = 17.57, p < 0.001), chlorophyll a (F = 62.19, p < 0.001), and conductivity (F = 497.49, p < 0.001) were found among the systems. These results indicate the existence of sharp differences between these karstic systems (oligotrophic, with smaller area, deep and less productive) and non-karstic ones, (eutrophic, larger area, shallow and more productive) but are similar to previous data from other karstic systems of Mexico and other parts of the world. However, understanding of these fragile tropical systems is in the initial phase. It is necessary to increase the intensity of these studies in order to allow a full explanation of their limnological behavior. C1 ECOSUR, Chetumal 77000, Quintana Roo, Mexico. RP Elias-Gutieerrez, M, ECOSUR, AP 424, Chetumal 77000, Quintana Roo, Mexico. CR *APHA, 1989, STAND METH EX WAT WA *COM NAC AG, 2001, DAT PREC ALCOCER J, 1993, REV BIOL TROP, V41, P1714 ALCOCER J, 1996, RES MANAGE, V2, P55 ARMENGOL X, 1999, J PLANKTON RES, V21, P2245 ARREDONDOFIGUER.JL, 1983, BIOTICA, V8, P37 BANDERAS A, 1991, HYDROBIOLOGIA, V224, P1 BARBIERI A, 1999, J LIMNOL, V2, P179 BIRGIT S, 1996, GEOFIS INT, V35, P153 BRYLINSKY M, 1973, LIMNOL OCEANOGR, V18, P1 CONDE D, 1999, LIMNOLOGY DEV COUNTR, P1 CONTRERASESPINO.F, 1994, AN I CIENC MAR LIMNO, V21, P55 DIAZARCE V, 2000, VERH INT VER LIMNOL, V27, P1 FEE EJ, 1979, LIMNOL OCEANOGR, V24, P401 FLORESNAVA A, 1989, AN I CIENC MAR LIMNO, V16, P223 GAONAVIZCAYNO S, 1980, REV I GEOLOGIA U NAC, V4, P32 GILLOOLY JF, 2000, LIMNOL OCEANOGR, V45, P22 HAMMER UT, 1986, MONOGRAPHIC BIOL, V59 HERRERASILVEIRA JA, 1998, PROC INT ASSOC THE 3, V26, P1348 HERRERASILVEIRA JA, 2000, AQUATIC ECOSYSTEMS M, P213 LIND OT, 1985, HDB COMMON METHODS L MARIN LE, 1994, GEOFIS INT, V33, P619 MAZUMDER A, 1998, CAN J FISH AQUAT SCI, V55, P1652 NAVARROMENDOZA M, 1987, ICHTHIC INVENTORY PR PLATH K, 2001, ECOLOGY, V82, P1260 REID GK, 1976, ECOLOGY INLAND WATER SCHMITTERSOTO JJ, 2002, HYDROBIOLOGIA, V467, P215 SHUTER BJ, 1997, CAN J FISH AQUAT SCI, V54, P359 STRINGFIELD TV, 1974, WATER CARBONATE ROCK, P25 SUAREZMORALES E, 2000, AQUATIC ECOSYSTEMS M, P151 TORRESOROZCO R, 1995, INTRO MANEJO DATOS L WEIDIE AE, 1974, WATER CARBONATE ROCK, P2 WHITE WB, 1995, AM SCI, V83, P450 NR 33 TC 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0018-8158 J9 HYDROBIOLOGIA JI Hydrobiologia PD AUG PY 2002 VL 482 IS 1-3 BP 167 EP 177 PG 11 SC Marine & Freshwater Biology GA 617YA UT ISI:000179387500016 ER PT J AU Verma, MP Tello, E Sandoval, F Tovar, R Martinez, JL TI An interlaboratory calibration of silica for geothermal water chemistry SO GEOTHERMICS LA English DT Article DE geothermal fluid; silica; calibration; atomic absorption spectrometry; colorimetry AB The results of an interlaboratory calibration of silica performed using commercial standards as samples are presented. The analytical values for silica concentration are consistent for lower concentration samples, but there are significant variations among the values for the higher concentration samples. The dilution technique is better than direct injection of high concentration samples to the atomic absorption spectrometer, although at present it is not possible to define the highest permissible silica concentration appropriate for direct measurements. High dilution factors also produce a high uncertainty in the analytical results. Therefore, the need still exists for conducting multi-laboratory calibrations over a wide range of silica concentrations to refine the precision and accuracy of silica analyses at high concentrations. (C) 2002 Published by Elsevier Science Ltd on behalf of CNR. C1 Geotermia, Inst Invest Elect, Cuernavaca 62001, Morelos, Mexico. CFE, Gerencia Proyectos Geotermoelect, Morelos, Michoacan, Mexico. CFE, Hidalgo, Michoacan, Mexico. CFE, Puebla, Mexico. RP Verma, MP, Geotermia, Inst Invest Elect, Apdo 1-475, Cuernavaca 62001, Morelos, Mexico. CR ALVISISIDRO R, 1999, RAS8075 IAEA ALVISISIDRO R, 2000, RESULTS 2000 IAEA IN BEVINGTON PR, 1969, DATA REDUCTION ERROR BOX GEP, 1978, STAT EXPERIMENTERS I ELLIS AJ, 1976, GEOCHIMICA COSMOCHIM, V40, P1359 GERARDOABAYA J, 1998, RAS8075 IAEA GIGGENBACH WF, 1992, IAEATECDOC641, P439 PARR RM, 1991, INTERCOMPARISON ENRI VERMA MP, 2002, P 27 WORKSH GEOTH RE, P436 NR 9 TC 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0375-6505 J9 GEOTHERMICS JI Geothermics PD DEC PY 2002 VL 31 IS 6 BP 677 EP 686 PG 10 SC Geosciences, Multidisciplinary; Energy & Fuels GA 618RX UT ISI:000179432000003 ER PT J AU Unsworth, M Enriquez, OC Belmonte, S Arzate, J Bedrosian, P TI Crustal structure of the Chicxulub Impact crater imaged with magnetotelluric exploration SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SIZE; GRADIENTS; CENOTES; YUCATAN AB The electrical resistivity structure of the Chicxulub Impact crater has been imaged using broadband magnetotelluric exploration. A 1-2 km thick sequence of conductive Tertiary sedimentary rocks was imaged within the crater. The shallow resistivity of this layer increases across the cenote ring. This is primarily due to a decrease in porosity, although the groundwater composition may have some effect. While this layer reduces the sensitivity of MT, several features can be discerned beneath it. In the center of the crater the structural high is imaged as a region of high resistivity. In the outer part of the crater, lower resistivities in the upper crust may be due to mineralization or hydrothermal alteration. C1 Univ Alberta, Dept Phys, Inst Geophys Res, Edmonton, AB T6G 2J1, Canada. Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico. Inst Politecn Nacl, CIIDIR Oaxaca, Xoxocotlan 71230, Oaxaca, Mexico. Univ Nacl Autonoma Mexico, UNICIT UNAM, Queretaro, Mexico. Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA. RP Unsworth, M, Univ Alberta, Dept Phys, Inst Geophys Res, Edmonton, AB T6G 2J1, Canada. CR CAMARGOZANOGUER.A, 1994, B ASOCIACION MEXICAN, V34, P1 CAMPOS JO, 1997, LEADING EDGE, P1774 CHRISTESON GL, 2001, J GEOPHYS RES-SOL EA, V106, P21751 EGBERT GD, 1997, GEOPHYS J INT, V130, P475 ESPINDOLA JM, 1995, PHYS EARTH PLANET IN, V92, P271 HILDEBRAND AR, 1991, GEOLOGY, V19, P687 HILDEBRAND AR, 1995, NATURE, V376, P415 HILDEBRAND AR, 1998, SPECIAL PUBLICATION, V140, P153 HILDEBRAND AR, 2000, CRATER FLOOR EXHALAT MARIN LE, 1990, THESIS NO ILLINOIS U MCNEICE GW, 2001, GEOPHYSICS, V66, P158 MORGAN J, 1997, NATURE, V390, P472 PALACKY GJ, 1991, ELECTROMAGNETIC METH, P53 PERRY E, 1995, GEOLOGY, V23, P17 RODI W, 2001, GEOPHYSICS, V66, P174 SHARPTON VL, 1993, SCIENCE, V261, P1564 WARD WC, 1995, GEOLOGY, V23, P873 NR 17 TC 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG 24 PY 2002 VL 29 IS 16 AR 1788 DI ARTN 1788 PG 4 SC Geosciences, Multidisciplinary GA 622EC UT ISI:000179632700001 ER PT J AU Agramonte-Hevia, J Gonzalez-Arenas, A Barrera, D Velasco-Velazquez, M TI Gram-negative bacteria and phagocytic cell interaction mediated by complement receptor 3 SO FEMS IMMUNOLOGY AND MEDICAL MICROBIOLOGY LA English DT Review DE complement receptor 3; bacteria; phagocytic cells ID SURFACTANT PROTEIN-D; DIFFERENTIATED U937 CELLS; INTEGRIN MAC-1 CD11B/CD18; O-ANTIGEN POLYSACCHARIDE; ESCHERICHIA-COLI; BORDETELLA-PERTUSSIS; PSEUDOMONAS-AERUGINOSA; HUMAN MONOCYTES; CR3 CD11B/CD18; FILAMENTOUS HEMAGGLUTININ AB Complement receptor 3 (CR3) is an integrin that recognizes several different ligands. Binding to CR3 in phagocytic cells activates signaling pathways involved in cytoskeleton rearrangement, regulation of cell motility, alteration of gene expression and phagocytosis of complement-opsonized as well as of some non-opsonized particles and pathogenic bacteria. However, CR3-mediated phagocytosis of some Gram-negative bacteria does not induce bacterial clearance. Pseudomonas aeruginosa, Salmonella and Escherichia coli are eliminated after phagocytic cell-bacteria interaction mediated by CR3. However, Bordetella takes advantage of the CR3 function and uses it to enter into macrophages leading to bacterial survival. The final fate of the pathogen is determined by combinations of host and bacterial factors, in which molecular interactions between CR3 and bacterial ligands are involved. (C) 2002 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved. C1 UNAM, Inst Invest Biomed, Dept Inmunol, Mexico City 04510, DF, Mexico. Natl Autonomous Univ Mexico, Dept Biol, Fac Quim, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Dept Farmacol, Fac Med, Mexico City 04510, DF, Mexico. RP Agramonte-Hevia, J, UNAM, Inst Invest Biomed, Dept Inmunol, Apartado Postal 70228,Ciudad Univ, Mexico City 04510, DF, Mexico. 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Med. Microbiol. PD DEC 13 PY 2002 VL 34 IS 4 BP 255 EP 266 PG 12 SC Immunology; Infectious Diseases; Microbiology GA 619PU UT ISI:000179485800002 ER PT S AU Borissova, J Kurtev, R Georgiev, L Rosado, M Ivanov, G TI IC1613OBassociations and star cluster candidates SO EXTRAGALACTIC STAR CLUSTERS SE IAU SYMPOSIA LA English DT Article ID IRREGULAR GALAXY IC-1613; OB ASSOCIATIONS; STELLAR CONTENT AB Moderately deep ground based UBV images are used to investigate the OB associations and star clusters in IC 1613. Fifty eight OB associations with sizes between 30 and 130 pc are outlined. The iteraction between associations and superbubbles in IC 1613 was analyzed. The lack of star clusters was confirmed. C1 Bulgarian Acad Sci, Astron Inst, Sofia, Bulgaria. Univ Sofia, Dept Astron, Sofia, Bulgaria. Univ Nacl Autonoma Mexico, Inst Astronoma, Mexico City 04510, DF, Mexico. RP Borissova, J, Bulgarian Acad Sci, Astron Inst, Sofia, Bulgaria. CR BAADE W, 1963, EVOLUTION STARS GALA BATTINELLI P, 1991, ASTRON ASTROPHYS, V244, P69 BORISSOVA J, 2000, REV MEX ASTRON ASTR, V36, P151 BRESOLIN F, 1998, ASTRON J, V116, P119 DOLPHIN A, 2000, APJ, V550, P554 FREEDMAN WL, 1988, AJ, V96, P1248 GEORGIEV L, 1999, ASTRON ASTROPHYS SUP, V134, P21 HODGE PW, 1978, ASTROPHYS J, V37, P145 VALDEZGUTIERREZ M, 2001, ASTRON ASTROPHYS, V366, P35 WYDER TK, 2000, PUBL ASTRON SOC PAC, V112, P594 NR 10 TC 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA SN 0074-1809 J9 IAU SYMP PY 2002 VL 207 BP 456 EP 458 PG 3 GA BV57N UT ISI:000179397100089 ER PT S AU Silich, S Oey, S TI Superbubble metallicities and X-ray luminosities SO EXTRAGALACTIC STAR CLUSTERS SE IAU SYMPOSIA LA English DT Article ID LARGE MAGELLANIC CLOUD AB We show that X-ray emission and dynamical properties of superbubbles around OB associations are affected by metal ejection from the enclosed Type 11 supernovae (SNe). The SN and massive star yields may significantly change the superbubble interior metallicity and enhance its X-ray luminosity. C1 Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. Lowell Observ, Flagstaff, AZ 86001 USA. RP Silich, S, Inst Nacl Astrofis Opt & Elect, AP 51 & 216, Puebla 72000, Mexico. CR ARTHUR SJ, 1996, ASTROPHYS J 1, V457, P752 BISNOVATYIKOGAN GS, 1995, REV MOD PHYS, V67, P661 CHU YH, 1990, ASTROPHYS J, V365, P510 MAEDER A, 1992, ASTRON ASTROPHYS, V264, P105 OEY MS, 1996, ASTROPHYS J 1, V467, P666 SILICH SA, 2001, MON NOT R ASTRON SOC, V324, P191 WANG Q, 1991, ASTROPHYS J, V373, P497 NR 7 TC 1 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA SN 0074-1809 J9 IAU SYMP PY 2002 VL 207 BP 459 EP 460 PG 2 GA BV57N UT ISI:000179397100090 ER PT J AU Villalobos-Molina, R Gallardo-Ortiz, IA Lopez-Guerrero, JJ Ibarra, M TI Evidence that NAN-190-induced hypotension involves vascular alpha(1)-adrenoceptor antagonism in the rat SO EUROPEAN JOURNAL OF PHARMACOLOGY LA English DT Article DE NAN-190; hypotension; rat, anaesthetized; rat, pithed; alpha(1)-adrenoceptor, vascular ID 5-HT1A RECEPTOR ANTAGONIST; 8-HYDROXY-2-(DI-N-PROPYLAMINO) TETRALIN 8-OH-DPAT; SPONTANEOUSLY HYPERTENSIVE RATS; DORSAL RAPHE NUCLEUS; BLOOD-PRESSURE; HIGH-AFFINITY; BMY-7378; WAY-100635; AGONISTS; NAN-190 AB The effect of NAN-190 (1-(2-methoxyphenyl)-4-[4-(2-phthalimido]-butyl] piperazine), described as a mixed 5-HT1A receptor agonist/antagonist, on cardiovascular function was studied. The i.v. injection of NAN-190 (1-300 mug/kg) dose-dependently decreased blood pressure (p < 0.001), while heart rate was not significantly modified compared to saline-treated, anaesthetized adult rats. WAY 100635 (N-[2-[4-(2-methoxyphenyl)-1-piperazinyl] ethyl]-N-(2-pyridinyl) cyclohexanecarboxamide), a highly selective 5-HT1A receptor antagonist, increased NAN-190-induced hypotension (p < 0.05). In the pithed rat NAN-190 displaced the phenylephrine dose-pressor response curve to the right; ED50 values were: approximate to 14, 20, 40 and 270 mug/kg for saline and NAN-190 (1, 10 and 100 mug/kg, respectively); similar ED50 values were obtained with prazosin (approximate to 20, 69 and 358 mug/kg for 1, 10 and 100 mug/kg of prazosin, respectively). NAN-190 shifted to the right the concentration-response curves to phenylephrine in rat tail artery (alpha(1A)-adrenoceptors), in rabbit aorta (alpha(1B)-adrenoceptors) and in rat aorta (alpha(1D)-adrenoceptors), with pA(2) values of 9.47, 9.02 and 9.99; while Schild slopes were -0.78, -1.13 and -0.90, respectively (not significantly different from unity). The results show that NAN-190 induced hypotension in the anaesthetized, adult rat and suggest that this effect could be explained by antagonism of vascular alpha(1)-adrenoceptors. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Ctr Invest & Estud Avanzados, Dept Farmacobiol, Mexico City 14330, DF, Mexico. UNAM, Fac Estudios Super Iztacala, Mexico City, DF, Mexico. RP Villalobos-Molina, R, Ctr Invest & Estud Avanzados, Dept Farmacobiol, Calz Tenorios 235,Sede Sur, Mexico City 14330, DF, Mexico. 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J. Pharmacol. PD NOV 22 PY 2002 VL 455 IS 1 BP 59 EP 64 PG 6 SC Pharmacology & Pharmacy GA 619KM UT ISI:000179475200007 ER PT J AU Nikol'skii, YN Bakhlaeva, OS Contreraz-Benitez, A Ordaz-Chaparro, V TI Assessment of changes in soil properties as dependent on hydrothermic conditions of plowlands (by the example of Mexico) SO EURASIAN SOIL SCIENCE LA English DT Article AB A relationship is found between some properties of virgin soils of Mexico within the range of heights from 0 to 2500 in a.s.l. and the radiation index of dryness suggested by M.I. Budyko. This relationship can be also used for long-term forecasts of changes in the properties of cultivated soils under the impact of an alteration of hydrothermic conditions on plowlands. C1 Postgrad Coll Agr Sci, Montecillo 56230, State Mexico, Mexico. RP Nikol'skii, YN, Postgrad Coll Agr Sci, Montecillo 56230, State Mexico, Mexico. CR *GOLD SOFTW INC, 1995, SURFER SURF MAPP SYS AIDAROV IP, 1985, REGULIROVANIE VODNO BUDYKO MI, 1977, GLOBALNAYA EKOLOGIYA GRIGOREV AA, 1954, IZV AKAD NAUK SSSR S, P5 HYAMS D, 1997, CURVE FITTING SYSTEM NIKOLSKII YN, 1987, GIDROTEKHN MELIOR, P20 RITZEMA HP, 1994, DRAINAGE PRINCIPLES, P121 SELLERS WD, 1965, PHYSICAL CLIMATOLOGY TEJEDA MA, 1999, ALGORITMOS SIMPLES E TORRES RE, 1995, AGROMETEOROLOGIA VENABLES WN, 1997, MODERN APPL STAT SPL, P186 VOLOBUEV VR, 1974, VVEDENIE ENERGETIKU NR 12 TC 0 PU INTERPERIODICA PI BIRMINGHAM PA PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA SN 1064-2293 J9 EURASIAN SOIL SCI JI Eurasian Soil Sci. PD OCT PY 2002 VL 35 IS 10 BP 1031 EP 1036 PG 6 SC Agriculture, Soil Science GA 618LD UT ISI:000179418800002 ER PT J AU Ancheyta, J Betancourt, G Centeno, G Marroquin, G Alonso, F Garciafigueroa, E TI Catalyst deactivation during hydroprocessing of Maya heavy crude oil. 1. Evaluation at constant operating conditions SO ENERGY & FUELS LA English DT Article AB A deactivation study during hydroprocessing of Maya heavy crude oil is reported. Experiments were carried out in fixed-bed pilot plant at the following constant operating conditions: pressure of 70 Kg/cm(2), Hydrogen-to-oil ratio of 5000 ft(3)/bbl, space velocity of 1.0 h(-1), and reaction temperature of 400 degreesC. Deactivation of catalyst was followed by monitoring the changes in asphaltenes, sulfur, metals (V and Ni), Rambottom carbon, and nitrogen contents in the products. The catalyst was characterized before and after reaction. Results indicate that catalyst deactivation is very fast during the first hours of the run. Coke and metals depositions were around 18 and 10%, respectively. Accumulation of vanadium was higher in the lobes of the catalyst. C1 Inst Mexicano Petr, Mexico City 07730, DF, Mexico. Inst Politecn Nacl, ESIQIE, Mexico City 07738, DF, Mexico. RP Ancheyta, J, Inst Mexicano Petr, Eje Cent Lazaro Cardenas 152, Mexico City 07730, DF, Mexico. CR ABSIHALABI M, 1991, APPL CATAL, V72, P193 ANCHEYTA J, 2001, APPL CATAL A-GEN, V216, P195 ANCHEYTA J, 2001, ENERG FUEL, V15, P120 BEUTHER H, 1980, CATALYST DEACTIVATIO, P271 CALLEJAS MA, 2001, APPL CATAL A-GEN, V218, P181 FURIMSKY E, 1998, APPL CATAL A-GEN, V171, P177 FURIMSKY E, 1999, CATAL TODAY, V52, P381 KOBAYASHI S, 1987, IND ENG CHEM RES, V26, P2245 NAKAMURA N, 1980, P 45 API MID M HOUST, V201, P22 SONG CS, 1991, IND ENG CHEM RES, V30, P1726 THAKUR DS, 1984, IND ENG CHEM PROD RD, V23, P349 WIWEL P, 1991, CATALYST DEACTIVATIO, P257 NR 12 TC 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD NOV-DEC PY 2002 VL 16 IS 6 BP 1438 EP 1443 PG 6 SC Engineering, Chemical; Energy & Fuels GA 619CA UT ISI:000179454700016 ER PT J AU Heimburger, A Acevedo-Garcia, D Schiavon, R Langer, A Mejia, G Corona, G del Castillo, E Ellertson, C TI Emergency contraception in Mexico City: knowledge, attitudes, and practices among providers and potential clients after a 3-year introduction effort SO CONTRACEPTION LA English DT Article DE emergency contraception; Mexico; knowledge; attitudes; practices ID YUZPE REGIMEN; UNIVERSITY; STUDENTS AB Emergency contraception (EC) has the potential to reduce unwanted pregnancy significantly, in Mexico as elsewhere. Recent years have seen tremendous growth in programs and research devoted to expanding access to emergency methods worldwide. In Mexico City, we conducted a pre-intervention/post-intervention research study of one way to introduce EC. Following a baseline survey of family planning providers and clients in 1997, we organized and implemented a three-year program of training for health care providers and a multi-faceted information campaign for the general public, including a national toll-free hotline and website. In 2000, we again surveyed family planning clinic providers and clients, using instruments similar to those employed in the baseline study. EC awareness increased significantly from 13% of clients to 32%, and support jumped from 73% to 83%. Providers at study clinics improved method recognition from 88% to 100%. (C) 2002 Elsevier Science Inc. All rights reserved. C1 Populat Council, Reg Off Latin Amer & Caribbean, Mexico City 04000, DF, Mexico. Harvard Univ, Sch Publ Hlth, Dept Hlth & Social Behav, Boston, MA 02115 USA. Inst Nacl Pediat, Mexico City 04530, DF, Mexico. Fdn Mexicana Planeac Familiar, Mexico City 14000, DF, Mexico. Testamos Funcionando Testa, Mexico City 11000, DF, Mexico. Grp Informac Reprod Elegida, Mexico City 04100, DF, Mexico. RP Ellertson, C, Populat Council, Reg Off Latin Amer & Caribbean, Escondida 110, Mexico City 04000, DF, Mexico. CR *A GUTTM I, 1994, CLAND AB LAT AM REAL *CONAPO, 1998, SIT DEM MEX *CONAPO, 2000, CUAD SAL REPR *CONS EM CONTR, 2000, EXP GLOB ACC EM CONT BIRD ST, 1998, J AM MED WOMENS A S2, V53, P262 CAMPBELL DT, 1966, EXPT QUASIEXPERIMENT ELLERTSON C, 1995, STUD FAMILY PLANN, V26, P251 ELLERTSON C, 1996, INT FAM PLAN PERSPEC, V22, P52 GLANZ K, 1995, THEORY GLANCE GUIDE GLASIER A, 1998, J AM MED WOMEN ASSOC, V53, P219 GRIMES D, 1998, LANCET, V352, P428 HARPER C, 1995, FAM PLANN PERSPECT, V27, P149 HARPER CC, 1995, AM J OBSTET GYNECOL, V173, P1438 HATCHER RA, 1998, CONTRACEPTIVE TECHNO LANGER A, 1999, CONTRACEPTION, V60, P233 MUIA E, 1999, CONTRACEPTION, V60, P223 PIAGGIO G, 1999, LANCET, V353, P721 ROGERS EM, 1995, DIFFUSION INNOVATION SCHIAVON R, 2000, REV INVEST CLIN, V52, P168 SPECTOR PE, 1981, RES DESIGNS, V7 TRUSSELL J, 1996, FAM PLANN PERSPECT, V28, P58 VERNON R, 1997, DOCUMENTO TRABAJO, V1 VERNON R, 1998, SERIE INOPAL, V3 WEBB A, 1995, FERTILITY CONTROL RE, V4, P16 NR 24 TC 8 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0010-7824 J9 CONTRACEPTION JI Contraception PD NOV PY 2002 VL 66 IS 5 BP 321 EP 329 PG 9 SC Obstetrics & Gynecology GA 619BC UT ISI:000179452600005 ER PT J AU Ellertson, C Heimburger, A Acevedo-Garcia, D Schiavon, R Mejia, G Corona, G del Castillo, E Langer, A TI Information campaign and advocacy efforts to promote access to emergency contraception in Mexico SO CONTRACEPTION LA English DT Article DE emergency contraception; Mexico; information campaign ID YUZPE REGIMEN AB Emergency contraception (EC) has the potential to reduce unwanted pregnancy significantly, in Mexico as elsewhere. Recent years have seen tremendous growth in programs and research devoted to expanding access to emergency methods worldwide. In Mexico we developed a comprehensive model introduction effort that included four components: provider training, public information (through a dedicated hotline and website, free media, paid radio and TV spots, participation in talk shows, and alternative media channels), collaboration with the public sector to include EC in the official family planning norms, and assistance to partner with commercial firms to register a dedicated EC product. Ongoing efforts to combat misperceptions and overcome opposition are crucial to informing the public and ensuring greater access to the method. (C) 2002 Elsevier Science Inc. All rights reserved. C1 Populat Council, Reg Off Latin Amer & Caribbean, Mexico City 04000, DF, Mexico. Harvard Univ, Sch Publ Hlth, Dept Hlth & Social Behav, Boston, MA 02115 USA. Fdn Mexicana Planeac Familiar, Tlalpan 04530, Mexico. Testamos Funcionando Testa, Mexico City 11000, DF, Mexico. Grp Informac Reprod Elegida, Mexico City 04100, DF, Mexico. RP Ellertson, C, Populat Council, Reg Off Latin Amer & Caribbean, Escondida 110, Mexico City 04000, DF, Mexico. CR *CONS EM CONTR, 2000, EXP GLOB ACC EM CONT CAMP S, 1998, J AM MED WOMENS A S2, V53, P225 ELLERTSON C, 1995, STUD FAMILY PLANN, V26, P251 ELLERTSON C, 1996, INT FAM PLAN PERSPEC, V22, P52 GRIMES D, 1998, LANCET, V352, P428 PIAGGIO G, 1999, LANCET, V353, P721 SCHIAVON R, 2000, REV INVEST CLIN, V52, P168 TRUSSELL J, 1996, FAM PLANN PERSPECT, V28, P58 TRUSSELL J, 1998, J AM MED WOMEN ASSOC, V53, P247 VERNON R, 1997, DOCUMENTO TRABAJO, V1 NR 10 TC 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0010-7824 J9 CONTRACEPTION JI Contraception PD NOV PY 2002 VL 66 IS 5 BP 331 EP 337 PG 7 SC Obstetrics & Gynecology GA 619BC UT ISI:000179452600006 ER PT J AU Furuzawa-Carballeda, J Rodriguez-Calderon, R de Leon, LD Alcocer-Varela, J TI Mediators of inflammation are down-regulated while apoptosis is up-regulated in rheumatoid arthritis synovial tissue by polymerized collagen (vol 130, pg 140, 2002) SO CLINICAL AND EXPERIMENTAL IMMUNOLOGY LA English DT Correction C1 Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Immunol & Rheumatol, Mexico City 14000, DF, Mexico. RP Furuzawa-Carballeda, J, Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Immunol & Rheumatol, Vasco Quiroga 15, Mexico City 14000, DF, Mexico. CR FURUZAWACARBALL.J, 2002, CLIN EXP IMMUNOL, V130, P148 NR 1 TC 0 PU BLACKWELL PUBLISHING LTD PI OXFORD PA 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND SN 0009-9104 J9 CLIN EXP IMMUNOL JI Clin. Exp. Immunol. PD DEC PY 2002 VL 130 IS 3 BP 565 EP 566 PG 2 SC Immunology GA 618GG UT ISI:000179409900031 ER PT J AU Alias, FM Daff, PJ Paneque, M Poveda, ML Carmona, E Perez, PJ Salazar, V Alvarado, Y Atencio, R Sanchez-Delgado, R TI C-C bond-forming reactions of Ir-III-alkenyls and nitriles or aldehydes: Generation of reactive hydride- and alkyl-alkylidene compounds and observation of a reversible 1,2-H shift in stable hydride-Ir-III alkylidene complexes SO CHEMISTRY-A EUROPEAN JOURNAL LA English DT Review DE aldehydes; C-H activation; carbene ligands; C-C coupling; iridium ID BETA-MIGRATORY INSERTION; CYCLO-ADDITION REACTIONS; IRIDIUM-PHOSPHINE CHEMISTRY; PI-ALLYL COMPLEXES; R = H; CARBENE COMPLEXES; ORGANIC-SYNTHESIS; AMIDE COMPLEXES; <(ME3SINCH2CH2)(3)N>(3-) LIGAND; HOMOGENEOUS CATALYSIS AB Nucleophilic attack of the carbon of an Ir-III-alkenyl functionality onto the alpha-carbon of a coordinated nitrile- or aldehyde occurs intramoleculary to yield initially iridacyclic structures. Nitriles give rise to isolable complexes that contain delocalized five-membered rings (iridapyrroles, e.g. 3'-8') in a reaction catalyzed by H2O (for some of these syntheses, Ir-III-eta(3)-allyl derivatives may be used as the source of the Ir-III-alkenyl moiety). In contrast, the alkenyl-to-aldehyde C-C coupling gives transient iridacycles that evolve by a fast, alkyl-to-alkylidene migration and beta-H elimination. The end products (13* and 14*) contain an elaborated chelating alkoxide-olefin ligand. Addition of [H(OEt2)(2)][BAr'(4)] to the iridapyrroles effects stereospecific protonation of the beta-ring carbon. Those iridapyrroles which contain an additional metal-alkyl functionality (e.g. 3a*, alkyl = C2H5) afford highly reactive cationic alkyl-alkylidene intermediates that evolve instantaneously by migratory insertion/beta-H elimination. The end products also contain an elaborated, chelating ligand, although this time with an olefin and imine terminus compared with the previous ligand. Contrary to this result, protonation of the hydride-iridapyrrole complex 8a* in weakly coordinating solvents permits isolation of two unusual cationic cis-hydride-alkylidene compounds 11*, which undergo reversible 1,2-H shifts. C1 Univ Sevilla, CSIC, Dept Quim Inorgan, Inst Invest Quim, Seville 41092, Spain. Univ Huelva, Dept Quim Inorgan & Ciencia Mat, Palos De La Frontera, Huelva, Spain. Univ Autonoma Estado Hidalgo, Ctr Invest Quim, Pachuca, Hidalgo, Mexico. Inst Venezolano Invest Cient, Caracas 1020A, Venezuela. RP Poveda, ML, Univ Sevilla, CSIC, Dept Quim Inorgan, Inst Invest Quim, Av Amer Vespucio S-N, Seville 41092, Spain. 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ZHEN HS, 1998, ORGANOMETALLICS, V17, P5397 NR 140 TC 5 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0947-6539 J9 CHEM-EUR J JI Chem.-Eur. J. PD NOV 15 PY 2002 VL 8 IS 22 BP 5132 EP 5146 PG 15 SC Chemistry, Multidisciplinary GA 618VJ UT ISI:000179437700010 ER PT J AU Asensio, JL Hidalgo, A Cuesta, I Gonzalez, C Canada, J Vicent, C Chiara, JL Cuevas, G Jimenez-Barbero, J TI Experimental evidence for the existence of non-exo-anomeric conformations in branched oligosaccharides: NMR analysis of the structure and dynamics of aminoglycosides of the neomycin family SO CHEMISTRY-A EUROPEAN JOURNAL LA English DT Article DE anomeric effect; antibiotics; molecular dynamics; molecular recognition; NMR spectroscopy ID 30S RIBOSOMAL-SUBUNIT; MOLECULAR-DYNAMICS; GLYCOSIDIC LINKAGE; RNA; RECOGNITION; SIMULATIONS; ANTIBIOTICS; RESTRAINTS; CONFORMER AB It is commonly known that the exo-anomeric effect is a major factor governing the conformational behavior of naturally occurring oligosaccharides. Conformational flexibility in these molecules mainly concerns the aglycon psi angle since phi is restricted by this stereo-electronic effect. In fact, to the best of our knowledge no case of a natural glycoside adopting a non-exo-anomeric conformation in solution has yet been reported. With respect to the flexibility among naturally occurring carbohydrates, branched type oligosaccharides including sugar residues glycosidated at contiguous positions (such as blood type carbohydrate antigens Lewis X) have been considered as the paradigm of rigid saccharides-the rigidity being enhanced by van der Waals interactions. Herein, we demonstrate unambiguously that both common beliefs are not to be generalized. For example in neomycin B, a branched oligosaccharide antibiotic, a large number of non-exo-anomeric conformations was detected in solution for the first time in naturally occurring sugars. This unusual behavior is attributed to branching. Here, polar contacts. between non-vicinal sugar units lead to an enhanced flexibility of the ribose glycosidic torsion phi. The influence of sugar flexibility on RNA recognition will also be discussed. C1 CSIC, Inst Quim Organ, Madrid 28006, Spain. CSIC, Inst Estruct Mat, Madrid, Spain. CSIC, Ctr Invest Biol, Madrid, Spain. Univ Nacl Autonoma Mexico, Mexico City 04510, DF, Mexico. RP Asensio, JL, CSIC, Inst Quim Organ, Juan Cierva 3, Madrid 28006, Spain. CR ASENSIO JL, 1999, J AM CHEM SOC, V121, P11318 CARTER AP, 2000, NATURE, V407, P340 CHIANSAN M, 2002, J AM CHEM SOC, V124, P1438 CHURCH TJ, 1997, J AM CHEM SOC, V119, P8645 CORNELL WD, 1995, J AM CHEM SOC, V117, P5179 CROS S, 1994, BIOPOLYMERS, V34, P1433 DABROWSKI J, 1995, J AM CHEM SOC, V117, P5534 ESPINOSA JF, 1996, ANGEW CHEM INT EDIT, V35, P303 ESPINOSA JF, 1996, ANGEW CHEM, V108, P323 ESPINOSA JF, 1998, J AM CHEM SOC, V120, P10862 FOURMY D, 1996, SCIENCE, V274, P1367 FRENCH AD, 1997, J MOL STRUCT THEOCHE, V271, P395 FRISCH MJ, 1995, GAUSSIAN 94 REVISION GABIUS HJ, 1997, GLYCOSCIENCES STATUS GARCIAHERRERO A, 2002, J AM CHEM SOC, V124, P4804 GORDON MT, 1999, J AM CHEM SOC, V121, P9682 HAASNOOT CAG, 1980, TETRAHEDRON, V36, P2783 HASELHORST T, 2001, J AM CHEM SOC, V123, P10705 HERMANN T, 1999, J MED CHEM, V42, P1250 KARPLUS M, 1959, J CHEM PHYS, V30, P11 LANDERSJO C, 1997, J AM CHEM SOC, V119, P8695 MILLER KE, 1992, BIOCHEMISTRY-US, V31, P6703 MILTON MJ, 1998, J AM CHEM SOC, V120, P10547 NAVARRE N, 1999, CHEM-EUR J, V5, P2281 OGLE JM, 2001, SCIENCE, V292, P897 PEARLMAN DA, 1994, J BIOMOL NMR, V4, P1 PEARLMAN DA, 1994, J BIOMOL NMR, V4, P279 PEARLMAN DA, 1995, COMPUT PHYS COMMUN, V91, P1 PHILLIPS ML, 1990, SCIENCE, V250, P1130 ROSS WS, CARNAL COORDINATE AN RYKAERT JP, 1977, J COMP PHYS, V23, P327 SAGUI C, 1999, ANNU REV BIOPH BIOM, V28, P155 TORDA AE, 1989, CHEM PHYS LETT, V157, P289 WALTER F, 1999, CURR OPIN CHEM BIOL, V3, P694 WOODS RJ, 1995, J PHYS CHEM-US, V99, P3832 XU QW, 1996, GLYCOBIOLOGY, V6, P281 NR 36 TC 5 PU WILEY-V C H VERLAG GMBH PI WEINHEIM PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY SN 0947-6539 J9 CHEM-EUR J JI Chem.-Eur. J. PD NOV 15 PY 2002 VL 8 IS 22 BP 5228 EP 5240 PG 13 SC Chemistry, Multidisciplinary GA 618VJ UT ISI:000179437700021 ER PT J AU Segovia-Hernandez, JG Hernandez, S Jimenez, A TI Control behaviour of thermally coupled distillation sequences SO CHEMICAL ENGINEERING RESEARCH & DESIGN LA English DT Article DE distillation; thermally coupled distillation; distillation control; energy integration ID SYSTEMS; DESIGN AB The controllability properties of thermally coupled distillation sequences for the separation of ternary mixtures are compared with those of the conventional direct and indirect sequences. Closed loop responses to set point changes were performed, and controllers were tuned to minimize their ISE values. The results indicate that the integrated systems exhibit better control properties than sequences based on conventional distillation columns. This result provides a further incentive for the use of those integrated systems. C1 Inst Technol Celaya, Dept Ingn Quim, Celaya 38010, Gto, Mexico. Univ Guanajuato, Fac Quim, Guanajuato, Mexico. RP Jimenez, A, Inst Technol Celaya, Dept Ingn Quim, Celaya 38010, Gto, Mexico. CR AGRAWAL R, 1998, AICHE J, V44, P2265 AGRAWAL R, 1999, AICHE J, V45, P485 AGRAWAL R, 2000, AICHE J, V11, P2198 AGRAWAL R, 2000, AICHE J, V11, P2211 ALATIQI IM, 1985, IND ENG CHEM PROC DD, V24, P500 FIDKOWSKI Z, 1991, AICHE J, V36, P275 FINN AJ, 1993, CHEM ENG PROG, V10, P41 GLINOS K, 1988, CHEM ENG RES DES, V66, P229 HERNANDEZ S, 1996, CHEM ENG RES DES, V74, P357 HERNANDEZ S, 1999, COMPUT CHEM ENG, V23, P1005 HERNANDEZ S, 1999, IND ENG CHEM RES, V38, P3957 JIMENEZ A, 2001, IND ENG CHEM RES, V40, P3757 LUYBEN ML, 1994, COMPUT CHEM ENG, V18, P933 STEPHANOPOULOS G, 1984, CHEM PROCESS CONTROL TEDDER DW, 1978, AICHE J, V24, P303 WOLFF EA, 1995, IND ENG CHEM RES, V34, P2094 NR 16 TC 6 PU INST CHEMICAL ENGINEERS PI RUGBY PA 165-189 RAILWAY TERRACE, DAVIS BLDG, RUGBY CV21 3BR, ENGLAND SN 0263-8762 J9 CHEM ENG RES DES JI Chem. Eng. Res. Des. PD OCT PY 2002 VL 80 IS A7 BP 783 EP 789 PG 7 SC Engineering, Chemical GA 619CX UT ISI:000179457300009 ER PT J AU Femat, R TI An extension to chaos control via Lie derivatives: Fully linearizable systems SO CHAOS LA English DT Article AB The technique of using Lie derivatives to control chaos introduced by Kocarev [Chaos, Solitons Fractals 9, 1359-1366 (1998)] is extended in this contribution. Here, by using Lie derivatives in an extended space state, it is proved that chaos can be practically suppressed via feedback in spite of the Lie derivative being ill-posed at the reference. The main idea is to construct a dynamically equivalent system. In this way, the chaotic system can be practically stabilized around any point of singularity x(0). The Lorenz equation is used as an illustrative example to show the application in the chaos control context. (C) 2002 American Institute of Physics. C1 Dept Matemat & Sistemas Computac, San Luis Potosi 78231, Mexico. RP Femat, R, Dept Matemat & Sistemas Computac, Apdo Postal 3-90, San Luis Potosi 78231, Mexico. CR ALVAREZRAMIREZ J, 2001, INT J BIFURCAT CHAOS, V11, P1411 FEMAT R, 2001, IEEE T CIRCUITS-I, V48, P1161 HENSON MA, 1990, AICHE J, V36, P1753 ISIDORI A, 1995, NONLINEAR CONTROL SY JACOBSON N, 1979, LIE ALGEBRA KOCAREV L, 1998, CHAOS SOLITON FRACT, V9, P1359 OLVER PJ, 1985, APPL LIE GROUPS DIFF NR 7 TC 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1054-1500 J9 CHAOS JI Chaos PD DEC PY 2002 VL 12 IS 4 BP 1027 EP 1033 PG 7 SC Mathematics, Applied; Physics, Mathematical GA 617ZX UT ISI:000179393000005 ER PT J AU Arechavaleta-Velasco, F Ogando, D Parry, S Vadillo-Ortega, F TI Production of matrix metalloproteinase-9 in lipopolysaccharide-stimulated human amnion occurs through an autocrine and paracrine proinflammatory cytokine-dependent system SO BIOLOGY OF REPRODUCTION LA English DT Article DE cytokines; parturition; pregnancy ID NECROSIS-FACTOR-ALPHA; HUMAN-TISSUE INHIBITOR; HUMAN GESTATIONAL TISSUES; HUMAN FETAL MEMBRANES; HUMAN CHORIONIC CELLS; PREMATURE RUPTURE; PRETERM LABOR; INTRAAMNIOTIC INFECTION; INFLAMMATORY CYTOKINES; IV COLLAGENASE AB The objective of this study was to determine the presence of autocrine/paracrine regulation of matrix metalloproteinase-9 (MMP-9) expression mediated by proinflammatory cytokines in human fetal membranes. Fetal membranes obtained from women who underwent cesarean delivery before labor were manually separated into amnion and chorion layers and maintained in culture. These explants; were stimulated with tumor necrosis factor alpha (TNFalpha), interleukin-1beta (IL-1beta), and either lipopolysaccharide (LPS) alone or LPS with anti-TNFalpha or anti-IL-1beta-neutralizing antibodies. Levels of proMMP-9 in culture media were evaluated by zymography. Enzyme-linked immunosorbant assay was performed to measure the quantity of IL-1beta, TNFalpha, and tissue inhibitor of matrix metalloproteinases-1 (TIMP-1) after LPS stimulation. ProMMP-9 activity was upregulated after stimulation of the amnion by LPS, TNFalpha, and IL-10. The increased activity of proMMP-9 resulting from LPS stimulation in the amnion was blocked by the addition of TNFalpha neutralizing antibody but not with anti-IL-10. No significant effect of LPS, TNFalpha, or IL-10 on proMMP-9 expression was observed in the chorion; however, the chorion produced both cytokines when stimulated with LPS. In contrast, TMP-1 levels remained unchanged in all cultures incubated in the presence of LPS. Therefore, these data indicate that proMMP-9 is produced by the amnion but not the chorion in response to LPS. Because anti-TNFalpha-neutralizing antibody inhibits proMMP-9 activity in the amnion, TNFalpha appears to upregulate proMMP-9 production by the amnion in an autocrine fashion. Meanwhile, TNFalpha and IL-10 produced by the chorion may upregulate amnionic proMMP-9 production in a paracrine manner. C1 Inst Nacl Perinatol, Res Direct, Mexico City 11000, DF, Mexico. Univ Penn, Ctr Res Reprod & Womens Hlth, Philadelphia, PA 19104 USA. RP Vadillo-Ortega, F, Inst Nacl Perinatol, Res Direct, Montes Urales 800, Mexico City 11000, DF, Mexico. 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Reprod. PD DEC PY 2002 VL 67 IS 6 BP 1952 EP 1958 PG 7 SC Reproductive Biology GA 619JM UT ISI:000179472900037 ER PT J AU Batista, CVF Gomez-Lagunas, F de la Vega, RCR Hajdu, P Panyi, G Gaspar, R Possani, LD TI Two novel toxins from the Amazonian scorpion Tityus cambridgei that block Kv1.3 and Shaker BK+-channels with distinctly different affinities SO BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS LA English DT Article DE K+-channel; Kv1.3; nomenclature; scorpion toxin; Shaker B; T lymphocyte ID GATED K+ CHANNELS; POTASSIUM CHANNELS; ION-CHANNELS; CHARYBDOTOXIN; CONDUCTANCE; PEPTIDES; LYMPHOCYTES; SELECTIVITY; RESIDUES AB Two novel toxic peptides (Tc30 and Tc32) were isolated and characterized from the venom of the Brazilian scorpion Tityus cambridgei. The first have 37 and the second 35 amino acid residues, with molecular masses of 3871.8 and 3521.5, respectively. Both contain three disulfide bridges but share only 27% identity. They are relatively potent inhibitors of K+-currents in human T lymphocytes with K-d values of 10 nM for Tc32 and 16 nM for Tc30, but they are less potent or quite poor blockers of Shaker B K+-channels, with respective Kd values of 74 nM and 4.7 muM. Tc30 has a lysine in position 27 and a tyrosine at position 36 identical to those of charybdotoxin. These two positions conform the dyad considered essential for activity. On the contrary, Tc32 has a serine in the position equivalent to lysine 27 of charybdotoxin and does not contain any aromatic amino acid. Due to its unique primary sequence and to its distinctive preference for K+-channels of T lymphocytes, it was classified as the first example of a new subfamily of K+-channel-specific peptides (alpha-KTx18.1). Tc30 is a member of the Tityus toxin II-9 subfamily and was given the number alpha-KTx4.4. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Natl Autonomous Univ Mexico, Inst Biotechnol, Dept Mol Recognit & Struct Biol, Cuernavaca, Morelos, Mexico. Natl Autonomous Univ Mexico, Sch Med, Dept Physiol, Mexico City 04510, DF, Mexico. Debrecen Univ Med, Dept Biophys & Cell Biol, H-4012 Debrecen, Hungary. Hlth Sci Ctr, H-4012 Debrecen, Hungary. RP Possani, LD, Natl Autonomous Univ Mexico, Inst Biotechnol, Dept Mol Recognit & Struct Biol, Colonia Chamilpa Avenida Univ 2001, Cuernavaca, Morelos, Mexico. CR AIYAR J, 1995, NEURON, V15, P1169 BATISTA CVF, 2000, FEBS LETT, V486, P117 BATISTA CVF, 2002, TOXICON, V40, P557 CAHALAN MD, 1990, SEMIN IMMUNOL, V2, P107 CAHALAN MD, 2001, J CLIN IMMUNOL, V21, P235 DAUPLAIS M, 1997, J BIOL CHEM, V272, P4302 DEUTSCH C, 1986, J PHYSIOL-LONDON, V372, P405 DEUTSCH C, 1990, PROG CLIN BIOL RES, V334, P251 DOYLE DA, 1998, SCIENCE, V280, P69 ESCOUBAS P, 1997, TOXICON, V35, P806 GARCIA ML, 1997, ADV PHARMACOL, V39, P425 GASPAR R, 1994, MOL PHARMACOL, V46, P762 GOLDSTEIN SAN, 1994, NEURON, V12, P1377 GOUDET C, 2002, TOXICON, V40, P1239 JAN LY, 1997, ANNU REV NEUROSCI, V20, P91 KLAIBER K, 1990, NEURON, V5, P221 KORADI R, 1996, J MOL GRAPHICS, V14, P51 MACKINNON R, 1988, J GEN PHYSIOL, V91, P335 MATTESON DR, 1984, NATURE, V307, P468 MILLER C, 1995, NEURON, V15, P5 MILLER C, 2000, GENOME BIOL, V1 PARDOLOPEZ L, 2002, J BIOL CHEM, V277, P16403 PETER M, 2001, J MEMBRANE BIOL, V179, P13 PISCIOTTA M, 2000, BBA-BIOMEMBRANES, V1468, P203 POASSANI LD, 2002, PERSPECTIVES MOL TOX, P201 POSSANI LD, 1999, PERSPECT DRUG DISCOV, V15, P15 POSSANI LD, 2000, BIOCHIMIE, V82, P861 RANGANATHAN R, 1996, NEURON, V16, P131 RAUER H, 2000, J BIOL CHEM, V275, P1201 ROBERTSON B, 1997, TRENDS PHARMACOL SCI, V18, P474 SHAKKOTTAI VG, 2001, J BIOL CHEM, V276, P43145 STAMPE P, 1994, BIOCHEMISTRY-US, V33, P443 THOMPSON JD, 1994, NUCLEIC ACIDS RES, V22, P4673 TYTGAT J, 1999, TRENDS PHARMACOL SCI, V20, P444 VARGA Z, 2001, BIOPHYS J, V80, P1280 NR 35 TC 23 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1570-9639 J9 BBA-PROTEINS PROTEOMICS JI BBA-Proteins Proteomics PD DEC 16 PY 2002 VL 1601 IS 2 BP 123 EP 131 PG 9 SC Biochemistry & Molecular Biology; Biophysics GA 619MG UT ISI:000179479300001 ER PT J AU Hayashi, N Kaikina, EI Naumkin, PI TI Asymptotic expansion of small solutions to the Landau-Ginzburg type equations SO ASYMPTOTIC ANALYSIS LA English DT Article DE dissipative nonlinear evolution equation; asymptotic expansions; Landau-Ginzburg equation ID LARGE TIME BEHAVIOR; SEMILINEAR PARABOLIC EQUATION; CAUCHY-PROBLEM; LOCAL SPACES AB We obtain the large time asymptotic expansion of small solutions to the Landau-Ginzburg type equations [GRAPHICS] where alpha,beta is an element of C, Ralpha > 0, R(beta/root2\alpha\(2) + alpha(2)) greater than or equal to 0, under the condition that the initial data phi are sufficiently small in a suitable weighted norm and the mean value integral phi(x) dx not equal 0. C1 Osaka Univ, Grad Sch Sci, Dept Math, Osaka 5600043, Japan. Inst Tecnol Morelia, Dept Ciencias Basicas, Morelia 58120, Michoacan, Mexico. Univ Michoacana, Inst Fis & Mtemat, Morelia 58040, Michoacan, Mexico. CR ESCOBEDO M, 1987, HOUSTON J MATH, V13, P39 ESCOBEDO M, 1995, COMMUN PART DIFF EQ, V20, P1427 FUJITA H, 1966, J FS U TOKYO, V13, P109 GALAKTIONOV VA, 1986, MATH USSR SB, V54, P421 GINIBRE J, 1996, PHYSICA D, V95, P191 GINIBRE J, 1997, COMMUN MATH PHYS, V187, P45 GMIRA A, 1984, J DIFFER EQUATIONS, V53, P258 HAYAKAWA K, 1973, P JAPAN ACAD, V49, P503 HAYASHI N, IN PRESS J ANAL MATH HAYASHI N, 2000, P ROY SOC EDINB A 5, V130, P1029 HAYASHI N, 2001, FUNCIALAJ EKVACIOJ, V44, P171 KAVIAN O, 1987, ANN I H POINCARE-AN, V4, P423 KOBAYASHI K, 1977, J MATH SOC JPN, V29, P407 MIZOGUCHI N, 1998, ARCH RATION MECH AN, V145, P331 OKAZAWA N, 2002, J MATH SOC JPN, V54, P1 WEISSLER FB, 1981, ISRAEL J MATH, V38, P29 NR 16 TC 1 PU IOS PRESS PI AMSTERDAM PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS SN 0921-7134 J9 ASYMPTOTIC ANAL JI Asymptotic Anal. PD NOV PY 2002 VL 32 IS 2 BP 91 EP 106 PG 16 SC Mathematics, Applied GA 618WE UT ISI:000179439600001 ER PT J AU Masciadri, E Dal Pino, EMD Raga, AC Noriega-Crespo, A TI The precession of the giant HH 34 outflow: A possible jet deceleration mechanism SO ASTROPHYSICAL JOURNAL LA English DT Article DE hydrodynamics; ISM : Herbig-Haro objects; ISM : jets and outflows; methods : numerical; stars : pre-main-sequence ID HERBIG-HARO FLOWS; YOUNG STARS; HH-34; SUPERJET; OBJECTS AB The giant jets represent a fundamental trace of the historical evolution of the outflow activity over timescales of similar to10(4) yr, i.e., a timescale comparable to the accretion time of the outflow sources in their main protostellar phase. The study of such huge jets provides the possibility of retrieving important elements related to the life of the outflow sources. In this paper, we study the role of precession (combined with jet velocity variability and the resulting enhanced interaction with the surrounding environment) as a deceleration mechanism for giant jets, using a numerical approach. This thesis was proposed for the first time by Devine et al., but it could not be numerically explored until now, because it is intrinsically difficult to reproduce, at the same time, the large range of scales from similar to100 AU up to a few parsecs. In the present paper, we obtain predictions of Halpha intensity maps and position-velocity diagrams from three-dimensional simulations of the giant HH 34 jet (including an appropriate ejection velocity time variability and a precession of the outflow axis), and we compare them with previously published observations of this object. Our simulations represent a step forward from previous numerical studies of HH objects, in that the use of a seven-level, binary adaptive grid has allowed us to compute models that appropriately cover all relevant scales of a giant jet, from the similar to100 AU jet radius close to the source to the similar to1 pc length of the outflow. A good qualitative and quantitative agreement is found between the model predictions and the observations, indicating that a precession of the jet axis can indeed be the probable cause of the deceleration of the giant jets. Moreover, we show that a critical parameter for obtaining a better or worse agreement with the observations is the ratio rho(j)/rho(a) between the jet and the environmental densities. The implications of this result in the context of the current star formation models are discussed. C1 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. Max Planck Inst Astron, D-69117 Heidelberg, Germany. Univ Sao Paulo, Inst Astron & Geofis, BR-05508090 Sao Paulo, Brazil. Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. CALTECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA. RP Masciadri, E, Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Mexico City 04510, DF, Mexico. CR BALLY J, 1994, APJ, V428, L65 CABRIT S, 2000, ASTRON ASTROPHYS, V354, P667 DALPINO EMD, 2001, ASTROPHYS J 1, V551, P347 DEVINE D, 1997, ASTRON J, V114, P2095 DOPITA MA, 1982, APJ, V263, L73 MASCIADRI E, 2002, ASTROPHYS J 1, V568, P733 MUNDT R, 1983, APJ, V274, L83 MUNDT R, 1987, ASTROPHYS J, V319, P275 MUNDT R, 1988, APJ, V333, L69 RAGA A, 1998, ASTRON J, V116, P2943 RAGA AC, 1993, MON NOT R ASTRON SOC, V264, P758 RAGA AC, 2000, REV MEX ASTRON ASTR, V36, P67 RAGA AC, 2002, ASTRON ASTROPHYS, V392, P267 REIPURTH B, 1986, ASTRON ASTROPHYS, V164, P51 REIPURTH B, 1989, ASTRON ASTROPHYS, V220, P249 REIPURTH B, 1989, NATURE, V340, P42 REIPURTH B, 1997, ASTRON J, V114, P2708 REIPURTH B, 1999, NATO ADV SCI I C-MAT, V540, P267 REIPURTH B, 2000, ASTRON J, V120, P3177 REIPURTH B, 2002, ASTRON J, V123, P362 ROSADO M, 1999, ASTRON J, V117, P462 TERQUEM C, 1999, ASTROPHYS J 2, V512, L131 VANLEER B, 1982, 8230 ICASE I APPL SC NR 23 TC 14 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 1 PY 2002 VL 580 IS 2 PN Part 1 BP 950 EP 958 PG 9 SC Astronomy & Astrophysics GA 619DG UT ISI:000179458300030 ER PT J AU Shu, FH Lizano, S Galli, D Canto, J Laughlin, G TI Self-similar champagne flows in HII regions SO ASTROPHYSICAL JOURNAL LA English DT Article DE HIII regions; hydrodynamics; ISM : clouds; stars : formation ID H-II REGIONS; MASSIVE STARS; VELOCITY STRUCTURE; CORES; PHOTOEVAPORATION; CONDENSATION; COLLAPSE; SPHERES; CLOUDS; DISKS AB We consider the idealized expansion of an initially self-gravitating, static, singular, isothermal cloud core. For t greater than or equal to 0, the gas is ionized and heated to a higher uniform temperature by the formation of a luminous but massless star in its center. The approximation that the mass and gravity of the central star are negligible for the subsequent motion of the H II region holds for distances r much greater than similar to100 AU and for the massive cloud cores that give rise to high-mass stars. If the initial ionization and heating are approximated to occur instantaneously at t = 0, then the subsequent flow (for r >> 100 AU) caused by the resulting imbalance between self-gravity and thermal pressure is self-similar. Because of the steep density profile (rho proportional to r(-2)), pressure gradients produce a shock front that travels into the cloud, accelerating the gas to supersonic velocities in what has been called the "champagne phase.'' The expansion of the inner region at t > 0 is connected to the outer envelope of the now ionized cloud core through this shock, whose strength depends on the temperature of the H II gas. In particular, we find a modified Larson-Penston (L-P) type of solution as part of the linear sequence of self-similar champagne outflows. The modification involves the proper insertion of a shock and produces the right behavior at infinity (v --> 0) for an outflow of finite duration, reconciling the long-standing conflict on the correct (inflow or outflow) interpretation for the original L-P solution. For realistic heating due to a massive young central star that ionizes and heats the gas to similar to10(4) K, we show that even the self-gravity of the ionized gas of the massive molecular cloud core can be neglected. We then study the self-similar solutions of the expansion of H II regions embedded in molecular clouds characterized by more general power-law density distributions: rho proportional to r(-n) with 3/2 < n < 3. In these cases, the shock velocity is an increasing function of the exponent n and diverges as n --> 3. We show that this happens because the model includes an origin where the pressure driving the shock diverges because the enclosed heated mass is infinite. Our results imply that the continued photoevaporation of massive reservoirs of neutral gas (e.g., surrounding disks and/or globules) near the embedded ionizing source is required in order to maintain over a significant timescale the emission measure observed in champagne flows. C1 Natl Tsing Hua Univ, Hsinchu 30013, Taiwan. Univ Nacl Autonoma Mexico, Inst Astron, Morelia 58089, Michoacan, Mexico. Osserv Astrofis Arcetri, I-50125 Florence, Italy. Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 4510, DF, Mexico. Univ Calif Santa Cruz, Lick Observ, Santa Cruz, CA 95064 USA. RP Shu, FH, Natl Tsing Hua Univ, 101 Sect 2 Kuang Fu Rd, Hsinchu 30013, Taiwan. 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J. PD DEC 1 PY 2002 VL 580 IS 2 PN Part 1 BP 969 EP 979 PG 11 SC Astronomy & Astrophysics GA 619DG UT ISI:000179458300032 ER PT J AU Valdez-Gutierrez, M Rosado, M Puerari, I Georgiev, L Borissova, J Ambrocio-Cruz, P TI Unveiling the kinematics and dynamics of ionized gas in the nearby irregular galaxy NGC 4449 SO ASTRONOMICAL JOURNAL LA English DT Article DE galaxies : individual (NGC 4449); galaxies : irregular; galaxies : ISM; galaxies : kinematics and dynamics; ISM : general ID H-II REGIONS; LARGE-MAGELLANIC-CLOUD; STAR-FORMING REGIONS; SUPER-NOVA REMNANT; INTERSTELLAR-MEDIUM; DWARF GALAXIES; LUMINOSITY FUNCTIONS; SIZE DISTRIBUTIONS; NEUTRAL HYDROGEN; NGC-4449 AB A detailed kinematic analysis of ionized gas in the nearby irregular galaxy NGC 4449 is presented. Observations were conducted in the spectral lines of Halpha and [S II]. Our scanning Fabry-Perot interferometric observations are presented from both a global and a local perspective. We have analyzed the global velocity field, the spatially extended diffuse gaseous component, and the H II region populations and, furthermore, have determined the rotation curve based on the heliocentric radial velocities of the global Halpha spatial distribution. Our results for NGC 4449 show that the optical velocity field decreases in radial velocity along the optical bar from northeast to southwest, presenting an anticorrelation relative to the outer velocity field of the H I component. This is in agreement with previous studies. The diffuse gaseous component that permeates the entire galaxy is analyzed (up to a limiting surface brightness of similar to3.165 x 10(-5) ergs cm(-2) s(-1) sr(-1)) in terms of its radial velocity field, as well as its velocity dispersions. We find that the diffuse gas component presents peculiar kinematic features, such as abrupt velocity gradients and highly supersonic velocity dispersions (sigma similar to 4 times the values of the nearest H II regions), but that its kinematic and dynamical influence is important on both global and local scales. The optical rotation curve of this nearby irregular galaxy shows that the northeast sector rotates like a solid body (v(rot) similar to 40 km s(-1) at R = 2 kpc). In contrast, for the southwest side our results are not conclusive; the behavior of the gas at those locations is chaotic. We conclude that the origin of such complex kinematics and dynamics is undoubtedly related to the aftermath of an interaction experienced by this galaxy in the past. C1 Inst Nacl Astrophys Opt & Elect, Puebla 198504, Mexico. Univ Nacl Autonoma Mexico, Astron Inst, Mexico City 04510, DF, Mexico. Bulgarian Acad Sci, Astron Inst, BG-1784 Sofia, Bulgaria. Isaac Newton Inst Chile, Bulgarian Branch, Sofia, Bulgaria. RP Valdez-Gutierrez, M, Observ Paris, Lab Etudes Rayonnement & Mat Astrophys, 61 Ave Observ, F-75014 Paris, France. 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J. PD DEC PY 2002 VL 124 IS 6 BP 3157 EP 3178 PG 22 SC Astronomy & Astrophysics GA 617KW UT ISI:000179361700012 ER PT J AU Persi, P Polcaro, VF Tapia, M Bohigas, J TI Young stellar objects in Gy 2-18 (IRAS 05439+3035) SO ASTRONOMICAL JOURNAL LA English DT Article DE stars : emission-line, Be; stars : formation; stars : pre-main-sequence ID HERBIG AE/BE STARS; INFRARED-SPECTROSCOPY; EMISSION; DUST; PHOTOMETRY; FEATURES; SPECTRA; LINES; DISKS AB We present the results of optical and near-IR spectra and mid-infrared images of the star forming region Gy 2-18, which is associated with IRAS 05439+3035. Within this region, there is a star with strong Halpha emission that is illuminating an optical reflection nebula. Optical and near-IR spectra indicate that this star, named IRS 11, is a possible Herbig Be star of spectral type BO-B2, with a strong stellar wind and an infrared excess probably originating in a circumstellar dust disk. The mid-infrared images at 8.7, 9.7, and 12.5 mum show the presence of a second very red source, IRS 9, deeply embedded in the cloud and with a remarkably strong silicate feature in absorption. The estimated bolometric luminosity of 8.6 x 10(3) L-. and the infrared spectral index alpha(IR) = 1.9 suggest that IRS 9 is a massive protostellar object. These two sources form the core of the young stellar cluster associated with Gy 2-18. The infrared luminosity and spectral index of another member, IRS 13, are estimated to be less than or equal to165 L-. and less than or equal to0.44. C1 Ist Astrofis Spaziale & Fis Cosm, I-00133 Rome, Italy. UNAM, Inst Astron, Ensenada 22830, Baja California, Mexico. RP Persi, P, Ist Astrofis Spaziale & Fis Cosm, Via Fosso Cavaliere 100, I-00133 Rome, Italy. CR BENEDETTINI M, 1998, ASTRON ASTROPHYS, V339, P159 BROOKE TY, 1993, ASTRON J, V106, P656 CAMPBELL B, 1989, ASTRON J, V98, P643 CRUZGONZALEZ I, 1994, REV MEX ASTRON ASTR, V29, P197 DACHS J, 1988, ASTRON ASTROPHYS, V194, P167 DRAINE BT, 1984, ASTROPHYS J, V285, P89 EGAN MP, 1999, 19991522 AFRLVSTR FABREGAT J, 1990, MON NOT R ASTRON SOC, V247, P407 GUYLBUDAGHIAN AL, 1982, AZH PISMA, V8, P232 GUYLBUDAGHIAN AL, 1983, SOV ASTRON LETT, V8, P123 HANUSCHIK RW, 1996, ASTRON ASTROPHYS, V308, P170 HILLENBRAND LA, 1992, ASTROPHYS J, V397, P613 HUMMER DG, 1987, MON NOT R ASTRON SOC, V224, P801 ISHII M, 1998, ASTRON J, V116, P868 ISHII M, 2001, ASTRON J, V121, P3191 IVEZIC Z, 1997, MON NOT R ASTRON SOC, V287, P799 IVEZIC Z, 1999, USER MANUAL DUSTY JASCHEK C, 1987, CLASSIFICATION STARS MERIGHI R, 1994, BFOSC USERS MANUAL NISINI B, 1995, ASTRON ASTROPHYS, V302, P169 PERSI P, 1988, AJ, V95, P1167 PERSI P, 1994, ASTRON ASTROPHYS, V291, P577 PERSI P, 2000, ASTR SOC P, V214, P498 PORTER JM, 1998, ASTRON ASTROPHYS, V332, P999 SALAS L, 2002, UNPUB SEATON MJ, 1979, MON NOT R ASTRON SOC, V187, P73 STETSON PB, 1987, PUBL ASTRON SOC PAC, V99, P191 STRAFELLA F, 1998, ASTROPHYS J 1, V505, P299 TAPIA M, 1997, ASTRON J, V113, P1769 TESTI L, 1998, ASTRON ASTROPHYS SUP, V133, P81 WHITTLE M, 1985, MON NOT R ASTRON SOC, V213, P1 WOUTERLOOT JGA, 1989, ASTRON ASTROPHYS SUP, V80, P149 ZOMBECK MV, 1990, HDB ASTRONOMY ASTROP NR 33 TC 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD DEC PY 2002 VL 124 IS 6 BP 3379 EP 3386 PG 8 SC Astronomy & Astrophysics GA 617KW UT ISI:000179361700030 ER PT J AU Stepanian, JA Chavushyan, VH Carrasco, L Valdes, JR Mujica, RM Tovmassian, HV Ayvazyan, VT TI Spectral observations of faint Markarian galaxies of the second Byurakan survey. III (vol 124, pg 1283, 2002) SO ASTRONOMICAL JOURNAL LA English DT Correction C1 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. Inst Nacl Astrofis Opt & Elect, Puebla, Mexico. Univ Nacl Autonoma Mexico, Observ Astron Nacl, Mexico City 04510, DF, Mexico. Russian Acad Sci, Special Astrophys Observ, Moscow 117901, Russia. Armenian State Pedag Inst, Yerevan, Armenia. RP Stepanian, JA, Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. CR STEPANIAN JA, 2002, ASTRON J, V124, P1283 NR 1 TC 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0004-6256 J9 ASTRON J JI Astron. J. PD DEC PY 2002 VL 124 IS 6 BP 3486 EP 3491 PG 6 SC Astronomy & Astrophysics GA 617KW UT ISI:000179361700042 ER PT J AU Kubiak, J Garcia-Gutierrez, A Urquiza, G TI The diagnosis of turbine component degradation - case histories SO APPLIED THERMAL ENGINEERING LA English DT Article DE component degradation; flow analysis; thermodynamic analysis; power losses; efficiency; steam and gas turbines AB Four case histories of steam and gas turbine components degradation identified during operation and verified during overhaul are presented. The diagnosis was carried out before the overhauls to indicate major problems to the personal of the plants. The estimation of degrees of degradation of the steam turbine components was carried out applying simplified flow equation [1] considering three key pressures. In the case of the gas turbine the output capacity and pressures, temperature and air and gas flow were analyzed. The results obtained during on-line analysis were confirmed by measurements of the dimensions of degraded components during an overhaul. Also, the results obtained from a sophisticated computer program proved the usefulness of the applied methods. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Cuernavaca 62210, Morelos, Mexico. Inst Invest Elect, Garencia Geotermia, Temixco 62490, Mexico. Inst Invest Elect, Garencia Turbomaquinaria, Temixco 62490, Mexico. RP Kubiak, J, Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Av Univ 1001,Col Chamilpa, Cuernavaca 62210, Morelos, Mexico. CR BLAZKO E, 1994, TURBINA COMPUTER PRO COTTON KC, 1993, EVALUATING IMPROVING KUBIAK J, UNPUB APPL THERMAL E KUBIAK J, 1996, P ASME IJPGC HOUST O, V2, P463 KUBIAK J, 2002, GEOTHERMICS, V31, P542 LUNIEWICZ B, 1990, IIE342257040P TURBOF URQUIZA G, 1998, 7 INT S TRANSP PHEN, P1693 NR 7 TC 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 1359-4311 J9 APPL THERM ENG JI Appl. Therm. Eng. PD DEC PY 2002 VL 22 IS 17 BP 1955 EP 1963 PG 9 SC Engineering, Mechanical; Energy & Fuels; Mechanics; Thermodynamics GA 619ZQ UT ISI:000179508300007 ER PT J AU Prazmowski, PA TI Endogenous credibility and stabilization programmes: evidencefrom the Dominican Republic SO APPLIED ECONOMICS LETTERS LA English DT Article ID DEMAND; MONEY AB This paper analyses the impact of policy misalignments and structural reform policies on credibility and the long-term success of an exchange rate based (ERB) stabilization programme to reduce inflationary inertia. A controlled signal state-space model is used to test this hypothesis for the Dominican Republic, a country that introduced an ERB programme in the early 1990s. The results indicate that fiscal and monetary malpractice will deteriorate credibility whereas structural reform policies, when perceived as beneficial, will enhance credibility, contributing to economic stability. C1 Cent Bank Dominican Repubic, Santo Domingo, Dominican Rep. RP Prazmowski, PA, Cent Bank Dominican Repubic, Mexico Ave No 92, Santo Domingo, Dominican Rep. CR AGENOR PR, 1992, INT MONET FUND S PAP, V39, P545 AGENOR PR, 1996, J DEV ECON, V50, P101 ARKERLOF G, 1985, Q J ECON, V100, P823 BARDSEN G, 1989, OXFORD B ECON STAT, V51, P345 BRUNO M, 1991, 183 PRINC U DEP EC I CARRUTH A, 2000, APPL ECON, V32, P1439 EDWARDS S, 1998, ECON J, V108, P665 FRIEDMAN M, 1956, STUDIES QUANTITY THE HAMILTON JD, 1994, TIME SERIES ANAL KNOT K, 1998, OXFORD ECON PAP, V50, P186 KOOPMAN SJ, 1999, ECONOMETRICS J, V2, P107 MACKINNON J, 1991, LONG RUN EC RELATION, CH13 NOLAN C, 1996, MONETARY POLICY UNCE YOUNG P, 1999, 99 IMF NR 14 TC 0 PU ROUTLEDGE PI HANTS PA CUSTOMER SERVICES DEPT, RANKINE RD, BASINGSTOKE, HANTS RG24 8PR, ENGLAND SN 1350-4851 J9 APPL ECON LETTERS JI Appl. Econ. Lett. PD NOV 15 PY 2002 VL 9 IS 14 BP 933 EP 937 PG 5 SC Economics GA 618ZJ UT ISI:000179448000007 ER PT J AU Burgos-Vargas, R TI Juvenile onset spondyloarthropathies: therapeutic aspects SO ANNALS OF THE RHEUMATIC DISEASES LA English DT Article ID NECROSIS-FACTOR-ALPHA; PEDIATRIC RHEUMATIC DISEASES; TRIGGERED REACTIVE ARTHRITIS; NEGATIVE BACTERIAL INVASION; SYNOVIAL-FLUID CELLS; ANKYLOSING-SPONDYLITIS; SERONEGATIVE ENTHESOPATHY; GUT INFLAMMATION; MONOCLONAL-ANTIBODY; CYTOKINE PROFILES AB Juvenile onset spondyloarthropathy (SpA) is a term that refers to a group of human leucocyte antigen (HLA)-B27 associated inflammatory disorders affecting children under the age of 16 years, producing a continuum of clinical symptoms through adulthood. This disease is characterised by enthesopathy and arthropathy affecting the joints of the lower extremities and seronegativity for IgM rheumatoid factor and antinuclear antibodies. Children usually present with undifferentiated SpA and progress to differentiated forms over time. Except for the prevalence of some clinical features at onset, the pathogenic and clinical aspects of juvenile onset SpAs resemble those of the adult disease. Thus application of the same or similar therapeutic measures for both juvenile and adult onset SpAs seems logical. Current for treatments for juvenile onset SpA provide symptomatic improvement, but do not alter disease progression. The increased expression of tumour necrosis factor alpha (TNFalpha) in synovial tissue of patients with adult and juvenile onset SpA and its correlation with infiltration of inflammatory mediators into the synovia suggest a significant pathogenic role of this cytokine. Clinical trials of anti-TNFalpha antibody (infliximab) therapy in patients with adult onset SpA have demonstrated significant clinical improvement in inflammatory pain, function, disease activity, and quality of life in correlation with histological and immunohistochemical evidence of modulation of synovial inflammatory processes. These promising findings suggest that anti-TNFalpha therapy may confer similar benefits in patients with juvenile onset SpA. C1 Univ Nacl Autonoma Mexico, Hosp Gen Mexico, Fac Med, Mexico City 06726, DF, Mexico. RP Burgos-Vargas, R, Univ Nacl Autonoma Mexico, Hosp Gen Mexico, Fac Med, Dr Balmis 148, Mexico City 06726, DF, Mexico. 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Rheum. Dis. PD DEC PY 2002 VL 61 SU Suppl. 3 BP 33 EP 39 PG 7 SC Rheumatology GA 619RE UT ISI:000179489500006 ER PT J AU Aguilar-Salinas, CA Rojas, R Gomez-Perez, FJ Garcia, E Valles, V Rios-Torres, JM Franco, A Olaiz, G Sepulveda, J Rull, JA TI Prevalence and characteristics of early-onset type 2 diabetes in Mexico SO AMERICAN JOURNAL OF MEDICINE LA English DT Article ID IMPAIRED GLUCOSE-TOLERANCE; INSULIN-RESISTANCE; CHINESE PATIENTS; MELLITUS; YOUNG; NIDDM; YOUTH; GLUCOKINASE; AMERICANS; MUTATIONS AB OBJECTIVE: To investigate the prevalence and characteristics of patients with type 2 diabetes diagnosed before the age of 40 years (early-onset disease) in a nationwide, population-based study. METHODS: Using a multistage sampling procedure, we enrolled a representative sample of Mexican urban adults aged 20 to 69 years. Weight, height, blood pressure, and plasma levels of glucose, insulin, and other metabolic parameters were measured in all subjects. RESULTS: We identified 993 subjects with type 2 diabetes, including 143 subjects aged 20 to 39 years (14% of those with diabetes). Subjects with early-onset diabetes had a greater prevalence of obesity and higher plasma insulin and lipid levels than did age-matched controls, and a greater prevalence of high-density lipoprotein cholesterol levels <35 mg/dL and severe hypertriglyceridemia than did older subjects with diabetes. Those (n = 32) with a normal body mass index (20 to 25 kg/m(2)) tended to have insulin deficiency as the main abnormality, whereas the "metabolic syndrome" characterized the remaining 111 subjects with early-onset diabetes. CONCLUSION: Most patients with early-onset type 2 diabetes in Mexico are obese or overweight, suggesting that obesity treatment and prevention programs may be effective in reducing the prevalence of this disease. (C)2002 by Excerpta Medica, Inc. C1 Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Endocrinol & Metab, Mexico City, DF, Mexico. Inst Nacl Salud Publ, Cuernavaca, Morelos, Mexico. RP Aguilar-Salinas, CA, Vasco de Quiroga 15, Mexico City 14000, DF, Mexico. 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J. Med. PD NOV PY 2002 VL 113 IS 7 BP 569 EP 574 PG 6 SC Medicine, General & Internal GA 619BR UT ISI:000179453900006 ER PT J AU Stephens, CR TI The renormalization group and the dynamics of genetic systems SO ACTA PHYSICA SLOVACA LA English DT Article AB In this brief article I show how the notion of coarse graining and the Renormalization Group enter naturally in the dynamics of genetic systems, in particular in the presence of recombination. I show how the latter induces a dynamics wherein coarse grained and fine grained degrees of freedom are naturally linked as a function of time leading to a hierarchical dynamics that has a Feynman-diagrammatic representation. I show how this coarse grained formulation can be exploited to obtain new results. C1 Natl Autonomous Univ Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RP Stephens, CR, Natl Autonomous Univ Mexico, Inst Ciencias Nucl, Circuito Exterior, Mexico City 04510, DF, Mexico. CR BURGER R, 2000, WILEY SERIES MATH CO DROSSEL B, CONDMAT0101409 DROSSEL B, 2001, IN PRESS ADV PHYSICS LANGDON W, 2001, FDN GENETIC PROGRAMM STEPHENS CR, 1997, P 7 INT C GEN ALG, P34 STEPHENS CR, 1998, PHYS REV E B, V57, P3251 STEPHENS CR, 1999, EVOLUTIONARY COMPUTA, V7, P109 STEPHENS CR, 2001, GENETIC PROGRAMMING, V2, P7 STEPHENS CR, 2001, P GEN EV COMP C GECC, P631 VOSE MD, 1999, SIMPLE GENETIC ALGOR WRIGHT A, 2002, P GECCO 2002, P642 NR 11 TC 2 PU SLOVAK ACAD SCIENCES INST PHYSICS PI BRATISLAVA PA DUBRAVSKA CESTA 9, 842 28 BRATISLAVA, SLOVAKIA SN 0323-0465 J9 ACTA PHYS SLOVACA JI Acta Phys. Slovaca PD DEC PY 2002 VL 52 IS 6 BP 515 EP 524 PG 10 SC Physics, Multidisciplinary GA 617LF UT ISI:000179362600006 ER PT J AU Minzoni, AA Smyth, NF Worthy, AL TI Radiation from a cut-off point in a two layer nonlinear TE mode waveguide SO WAVE MOTION LA English DT Article ID NON-LINEAR INTERFACE; WAVE-GUIDES; PROPAGATION; BEAMS; REFLECTION; BOTTOM; FIBERS AB In this work, the propagation of a nonlinear transverse electric (TE) mode in an optical two layer waveguide is considered for the case in which the layers are slowly varying. For a semi-infinite straight boundary between the layers, it is known that trapped modes exist which travel close to the interface. In the present work the upper layer light channel is taken to be of finite extent, while the lower layer is taken to be semi-infinite. The lateral stratification causes trapped modes to cut-off, so that energy is then beamed into the lower layer. In the present work a canonical nonlinear Schrodinger (NLS) equation is obtained which describes, together with an appropriate boundary condition, the radiation beamed into the lower light channel (material layer). It is found from numerical solutions that the radiating mode in the lower layer propagates as a soliton. Approximate solutions for this radiation are found using two methods. The first assumes that the radiating mode is a soliton whose amplitude and width are constant, but whose velocity can vary. The equation governing the soliton velocity is derived using conservation of energy. The second method allows the amplitude, width and velocity all to vary and the equations governing these parameters are obtained from an averaged Lagrangian for the NLS equation. Solutions obtained from the second approximate method are in much better agreement with numerical solutions since the amplitude of the soliton undergoes significant variation in the lower layer (light channel). Since the equation is canonical, it is apparent that nonlinearity induces coherent propagation in the wave radiated into the lower layer (light channel). (C) 2003 Elsevier Science B.V. All rights reserved. C1 Univ Edinburgh, Dept Math & Stat, Edinburgh EH9 3JZ, Midlothian, Scotland. Univ Nacl Autonoma Mexico, IIMAS, FENOMEC, Dept Mat & Mech, Mexico City 01000, DF, Mexico. Univ Wollongong, Sch Math & Appl Stat, Wollongong, NSW 2522, Australia. RP Smyth, NF, Univ Edinburgh, Dept Math & Stat, Kings Bldg,Mayfield Rd, Edinburgh EH9 3JZ, Midlothian, Scotland. CR ACEVES AB, 1989, PHYS REV A, V39, P1809 ACEVES AB, 1990, J OPT SOC AM B, V7, P963 FORNBERG B, 1978, PHILOS T ROY SOC A, V289, P373 GARCIAREIMBERT C, 1988, J ELASTICITY, V20, P143 JENSEN FB, 1980, J ACOUST SOC AM, V67, P1564 KATH WL, 1993, ACOUST SOC AM, V93, P182 KATH WL, 1995, PHYS REV E, V51, P1484 LAM L, 1992, SOLITONS LIQUID CRYS MANEUF S, 1988, OPT COMMUN, V65, P193 MANEUF S, 1988, OPT COMMUN, V66, P325 MCKINNON KIM, 1999, J OPT SOC AM B, V16, P441 NEWELL AC, 1992, NONLINEAR OPTICS PIERCE AD, 1982, J ACOUST SOC AM, V72, P523 SMITH PW, 1979, APPL PHYS LETT, V35, P846 SMITH PW, 1981, IEEE J QUANTUM ELECT, V17, P340 SMYTH NF, 1997, J OPT SOC AM B, V14, P2610 VARATHARAJAH P, 1990, PHYS REV A, V42, P1767 NR 17 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD JAN PY 2003 VL 37 IS 1 BP 25 EP 42 PG 18 SC Physics, Multidisciplinary; Acoustics; Mechanics GA 617FZ UT ISI:000179352500003 ER PT J AU Luna-Martinez, JE Mejia-Teran, C TI Brucellosis in Mexico: current status and trends SO VETERINARY MICROBIOLOGY LA English DT Article DE brucellosis; bovine; goats; sheep; humans; Mexico ID FLUORESCENCE-POLARIZATION ASSAY; BOVINE BRUCELLOSIS; DIAGNOSIS AB Traditionally, Mexico has been recognized as endemic with brucellosis. The improvements in diagnostics techniques and vaccination strategies and the enforcement of a national eradication policy have contributed significantly to making progress in the control of brucellosis. The current status of brucellosis and its risk factors, in the different production species as well as in human population is reviewed. Also the trends in control and eventual eradication strategies and perspectives for the near future of Mexico are presented. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Natl Autonomous Univ Mexico, Natl Dairy Cattlemen Assoc Mexico, Iztacalco, DF, Mexico. Natl Bovine TB & Brucellosis Eradicat Campaigns, Dept Epidemiol, Secretariat Agr Livestock Rural Dev Fisheries & F, Coyoacan 04100, DF, Mexico. RP Luna-Martinez, JE, Natl Autonomous Univ Mexico, Natl Dairy Cattlemen Assoc Mexico, Ote 257,Mz24N55, Iztacalco, DF, Mexico. CR *DIR TUB BOV BRUC, 2000, INF AN 2000 CASTANEDA MR, 1953, REV ISET, V13, P3 DAJER A, 1999, PREV VET MED, V40, P67 GURRIA TFJ, 1998, 3 FOR NAC BRUC MEM LOPEZMERINO A, 1989, BRUCELLOSIS CLIN LAB, P151 LOPEZMERINO A, 1992, SALUD PUBLICA MEXICO, V34, P230 LUNAMARTINEZ JE, 1999, REUN CONS EXP OPS OM, P44 LUNAMARTINEZ JE, 1999, REUN CONS EXP OPS OM, P84 MENDEZ NG, 1999, VET MEXICO, V30, P329 NIELSEN K, 2001, VET MICROBIOL, V80, P163 PACHECO HA, 1999, 53 REUN AN SOC MEX S, P41 RAGAN V, 2000, P 104 ANN M USAHA US, P217 RIO JA, 1977, P BOV BRUC INT S TEX SILVA R, 1948, 1 REUN INT BRUC, P1 NR 14 TC 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1135 J9 VET MICROBIOL JI Vet. Microbiol. PD DEC 20 PY 2002 VL 90 IS 1-4 SI Sp. Iss. SI BP 19 EP 30 PG 12 SC Microbiology; Veterinary Sciences GA 615VV UT ISI:000179268600004 ER PT J AU Quiroz, Y Herrera-Acosta, J Johnson, RJ Rodriguez-Iturbe, B TI Mycophenolate mofetil treatment in conditions different from organ transplantation SO TRANSPLANTATION PROCEEDINGS LA English DT Article ID SALT-SENSITIVE HYPERTENSION; ISCHEMIA-REPERFUSION INJURY; SYSTEMIC-LUPUS-ERYTHEMATOSUS; ANGIOTENSIN-II EXPOSURE; STEROID-SPARING AGENT; ACTIVE CROHNS-DISEASE; RAT REMNANT KIDNEY; WEGENERS-GRANULOMATOSIS; HEYMANN NEPHRITIS; RENAL INJURY C1 FUNDACITE Zulia, Inst Invest Biomed, Maracaibo, Venezuela. Univ Hosp, Renal Serv & Lab, Maracaibo, Venezuela. Baylor Med Sch, Div Nephrol, Houston, TX 77030 USA. Inst Nacl Cardiol, Div Nephrol, Mexico City, DF, Mexico. RP Rodriguez-Iturbe, B, Apartado Postal 1430, Maracaibo 4001 A, Venezuela. CR *EUR MYC MOF COOP, 1995, LANCET, V345, P121 ALLISON AC, 2000, IMMUNOPHARMACOLOGY, V47, P85 AMEEN M, 2001, CLIN EXP DERMATOL, V26, P480 BADID C, 2000, KIDNEY INT, V58, P51 BRIGGS WA, 1998, AM J KIDNEY DIS, V31, P364 BURATTI S, 2001, J RHEUMATOL, V28, P2103 CHAN TM, 2000, NEW ENGL J MED, V343, P1156 CORNA D, 1997, KIDNEY INT, V51, P1583 COW KM, 2001, AM J KIDNEY DIS, V38, E3 DAINA E, 1999, ANN INTERN MED, V130, P422 DAVISON SC, 2000, BRIT J DERMATOL, V143, P405 DOOLEY MA, 1999, J AM SOC NEPHROL, V10, P833 ENK AH, 1999, ARCH DERMATOL, V135, P54 FELLERMANN K, 2000, ALIMENT PHARM THERAP, V14, P171 FICKERT P, 2000, AM J GASTROENTEROL, V95, P550 FRANCO M, 2001, J AM SOC NEPHROL, V12, P2263 FU YF, 2001, CLIN NEPHROL, V55, P318 FUJIHARA CK, 1998, KIDNEY INT, V54, P1510 FUJIHARA CK, 2000, J AM SOC NEPHROL, V11, P283 FUJIHARA CK, 2001, HYPERTENSION, V37, P170 GAUBITZ M, 1999, LUPUS, V8, P73 GEILEN CC, 2001, BRIT J DERMATOL, V144, P583 GLICKLICH D, 1998, AM J KIDNEY DIS, V32, P318 GOLDBLUM R, 1993, CLIN EXP RHEUM S8, V11, S117 GREENSTEIN SM, 2000, J SURG RES, V15, P123 GROSS WL, 1999, CURR OPIN RHEUMATOL, V11, P41 GRUNDMANNKOLLMA.M, 2002, J AM ACAD DERMATOL, V4, P835 GRUNDMANNKOLLMAN M, 2001, ARCH DERMATOL, V137, P870 GRUNDMANNKOLLMANN M, 1999, J AM ACAD DERMATOL 1, V40, P957 HASSARD PV, 2000, INFLAMM BOWEL DIS, V6, P16 HAUFS MG, 1998, BRIT J DERMATOL, V138, P170 HSIAO CJ, 2001, BRIT J DERMATOL, V144, P372 JAYNE D, 1999, CURR OPIN NEPHROL HY, V8, P563 JONES EA, 2000, J UROLOGY, V163, P999 JONSSON CA, 1999, CLIN EXP IMMUNOL, V116, P534 KATZ KH, 2000, J AM ACAD DERMATOL, V42, P514 LUCA ME, 2000, EXP NEPHROL, V8, P77 LUI SL, 2001, NEPHROL DIAL TRANSPL, V16, P1577 MEGAHED M, 2001, J AM ACAD DERMATOL, V45, P256 MIEHSLER W, 2001, AM J GASTROENTEROL, V96, P782 NEUBER K, 2000, BRIT J DERMATOL, V143, P385 NEURATH MF, 1999, GUT, V44, P625 NOUSARI HC, 1999, J AM ACAD DERMATOL 1, V40, P265 NOWACK R, 1997, LANCET, V349, P774 NOWACK R, 1999, J AM SOC NEPHROL, V10, P1965 PENNY MJ, 1998, J AM SOC NEPHROL, V9, P2272 QUIROZ Y, 2001, AM J PHYSIOL-RENAL, V281, F38 RADHAKRISHNAN A, 1999, J AM SOC NEPHROL, V10 REMUZZI G, 1999, J AM SOC NEPHROL, V10, P1542 RODRIGUEZITURBE B, 2001, KIDNEY INT, V59, P2222 RODRIGUEZITURBE B, 2002, IN PRESS AM J PHYSL ROMERO F, 1999, KIDNEY INT, V55, P945 ROMERO F, 2000, ATHEROSCLEROSIS, V152, P127 SCHIELE J, 1999, ANN MED INTERNE, V150, P127 VALENTIN JF, 2000, TRANSPLANTATION, V69, P344 VANBRUGGEN MCJ, 1998, J AM SOC NEPHROL, V9, P1407 WAISER J, 1999, AM J KIDNEY DIS, V34 WILLIAMS JV, 2000, BRIT J DERMATOL, V142, P506 WOYWODT A, 2000, AM J NEPHROL, V20, P468 YU CC, 2001, J LAB CLIN MED, V138, P69 ZIERHUT M, 2001, OPHTHALMOLOGE, V98, P647 ZISWILER R, 1998, J AM SOC NEPHROL, V9, P2055 ZOJA C, 2001, KIDNEY INT, V60, P653 NR 63 TC 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0041-1345 J9 TRANSPLANT PROC JI Transplant. Proc. PD NOV PY 2002 VL 34 IS 7 BP 2523 EP 2526 PG 4 SC Immunology; Surgery; Transplantation GA 613ZP UT ISI:000179162200007 ER PT J AU Gracida, C Melchor, JL Espinoza, R Cedillo, U Cancino, J TI Experience in a single transplant center with 421 living donors: Follow-up of 9 years SO TRANSPLANTATION PROCEEDINGS LA English DT Article ID KIDNEY C1 Especialidades Hosp, Transplant Serv, Mexico City, DF, Mexico. RP Gracida, C, Heriberto Frias 112-8,Col Narvarte, Mexico City 03020, DF, Mexico. CR JOHNS EM, 1997, TRANSPLANTATION, V64, P1121 MELCHOR JL, 1999, TRANSPLANT P, V31, P2294 MELCHOR JL, 2000, CLIN TRANSPLANT, P379 NAJARIAN JS, 1992, LANCET, V340, P807 VASSILIOS EP, 2000, CURR OPIN ORGAN TRAN, V5, P319 NR 5 TC 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0041-1345 J9 TRANSPLANT PROC JI Transplant. Proc. PD NOV PY 2002 VL 34 IS 7 BP 2535 EP 2536 PG 2 SC Immunology; Surgery; Transplantation GA 613ZP UT ISI:000179162200011 ER PT J AU Melchor, JL Cancino, J Gracida, C TI Lymphoproliferative disorders following kidney transplantation SO TRANSPLANTATION PROCEEDINGS LA English DT Article C1 Especialodades Hosp, Transplant Serv, Mexico City 06700, DF, Mexico. RP Melchor, JL, Especialodades Hosp, Transplant Serv, Orizaba 198-1, Mexico City 06700, DF, Mexico. CR NALSNIK MA, 1988, AM J PATHOL, V133, P173 OPELZ G, 1993, LANCET, V342, P1514 PENN I, 1990, NEW ENGL J MED, V323, P1767 NR 3 TC 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0041-1345 J9 TRANSPLANT PROC JI Transplant. Proc. PD NOV PY 2002 VL 34 IS 7 BP 2537 EP 2538 PG 2 SC Immunology; Surgery; Transplantation GA 613ZP UT ISI:000179162200012 ER PT J AU Melchor, JL Espinoza, R Gracida, C TI Kidney transplantation in patients with ventricular ejection fraction less than 50 percent: Features and posttransplant outcome SO TRANSPLANTATION PROCEEDINGS LA English DT Article C1 Especialodades Hosp, Transplant Serv, CMN Siglo 21, Mexico City 06700, DF, Mexico. RP Melchor, JL, Especialodades Hosp, Transplant Serv, CMN Siglo 21, Orizaba 198-1,Col Roma, Mexico City 06700, DF, Mexico. CR DANOVITCH GM, 2001, CURR OPIN ORGAN TRAN, V6, P145 HARNETT JD, 1994, PRINCIPLES PRACTICES HRNETT JD, 1995, KIDNEY INT, V47, P884 PARFREY PS, 1988, ARCH INTERN MED, V148, P1519 VENKATESAN J, 1997, SEMIN NEPHROL, V17, P257 NR 5 TC 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0041-1345 J9 TRANSPLANT PROC JI Transplant. Proc. PD NOV PY 2002 VL 34 IS 7 BP 2539 EP 2540 PG 2 SC Immunology; Surgery; Transplantation GA 613ZP UT ISI:000179162200013 ER PT J AU Cedillo, U Gracida, C Espinoza, R Cancino, J TI Vesical augmentation and continent ureterostomy in kidney transplant patients SO TRANSPLANTATION PROCEEDINGS LA English DT Article C1 Especialodades Hosp, Transplant Serv, Mexico City, DF, Mexico. Especialodades Hosp, Serv Urol, Mexico City, DF, Mexico. RP Cedillo, U, Heriberto Frias 112-8 Col Narvarte, Mexico City 03020, DF, Mexico. CR DEGROAT WC, 1993, UROL CLIN N AM, V20, P383 GOODWIN WE, 1959, SURG GYNECOL OBSTET, V108, P240 YALLA SV, 1977, J UROLOGY, V118, P1026 NR 3 TC 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0041-1345 J9 TRANSPLANT PROC JI Transplant. Proc. PD NOV PY 2002 VL 34 IS 7 BP 2541 EP 2542 PG 2 SC Immunology; Surgery; Transplantation GA 613ZP UT ISI:000179162200014 ER PT J AU Illanes, A TI Separating subsets and stable values SO TOPOLOGY AND ITS APPLICATIONS LA English DT Article DE Class(S); continuum; stable value; terminal subcontinua AB Let X be a metric continuum. In this paper we prove that if there exist pariwise disjoint terminal subcontinua A(1) ,..., A(n) of X such that X - (A(1) boolean OR...boolean OR A(n)) is disconnected, then each onto map f : Y--> X has a stable value. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Math, Mexico City 04510, DF, Mexico. RP Illanes, A, Inst Math, Circuito Exterior,Cd Univ, Mexico City 04510, DF, Mexico. CR NADLER SB, 1992, MONOGRAPHS TXB PURE, V158 NADLER SB, 2002, TOPOL APPL, V126, P429 NR 2 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-8641 J9 TOPOL APPL JI Topology Appl. PD DEC 10 PY 2002 VL 126 IS 3 BP 359 EP 360 PG 2 SC Mathematics, Applied; Mathematics GA 616WU UT ISI:000179327000004 ER PT J AU Lopez, MD TI Hyperspaces homeomorphic to cones SO TOPOLOGY AND ITS APPLICATIONS LA English DT Article DE cone; cone = hyperspace property; continuum; hyperspace; indecomposable ID PROPERTY AB Let X be a continuum. Suppose that there exists a homeomorphism h:C(X) --> cone(Z), where C(X) is the hyperspace of subcontinua of X and Z is a finite-dimensional continuum. In this paper we prove that if Y is an element of C(X) and h(Y) is the vertex of cone(Z), then Y has the cone = hyperspace property, X - Y has a finite number of components and each one of them is homeomorphic either to [0, infinity) or to the real line. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Math, Mexico City 04510, DF, Mexico. RP Lopez, MD, Inst Math, Circuito Exterior,Cd Univ, Mexico City 04510, DF, Mexico. CR ANCEL FD, 1999, TOPOL APPL, V98, P19 DILKS AM, 1981, P AM MATH SOC, V83, P633 ILLANES A, 1988, FUND MATH, V130, P57 ILLANES A, 1991, TOPOLOGY P, V16, P63 ILLANES A, 1995, GLASNIK MAT, V30, P285 ILLANES A, 1997, TOPOL APPL, V79, P229 ILLANES A, 1999, MONOGRAPHS TXB PURE, V216 ILLANES A, 2001, TOPOL APPL, V113, P61 ILLANES A, 2002, TOPOL APPL, V126, P377 INGRAM WT, 1991, CANAD MATH B, V34, P351 MACIAS S, 1997, P AM MATH SOC, V125, P3069 NADLER SB, 1977, T AM MATH SOC, V230, P321 NADLER SB, 1978, MONOGRAPHS TXB PURE, V49 ROGERS JT, 1971, P AM MATH SOC, V29, P165 ROGERS JT, 1972, CAN J MATH, V24, P279 ROGERS JT, 1973, GEN TOPOL APPL, V3, P283 SHERLING DD, 1983, CAN J MATH, V35, P1030 NR 17 TC 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-8641 J9 TOPOL APPL JI Topology Appl. PD DEC 10 PY 2002 VL 126 IS 3 BP 361 EP 375 PG 15 SC Mathematics, Applied; Mathematics GA 616WU UT ISI:000179327000005 ER PT J AU Illanes, A Lopez, MD TI Hyperspaces homeomorphic to cones, II SO TOPOLOGY AND ITS APPLICATIONS LA English DT Article DE cone; continuum; decomposable; finite-dimensional; hyperspace; indecomposable ID PROPERTY AB In this paper we characterize the hereditarily decomposable continua X such that the hyperspace of subcontinua of X is homeomorphic to the cone over a finite-dimensional continuum Z. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Math, Mexico City 04510, DF, Mexico. RP Illanes, A, Inst Math, Circuito Exterior,Cd Univ, Mexico City 04510, DF, Mexico. CR ANCEL FD, 1999, TOPOL APPL, V98, P19 DILKS AM, 1981, P AM MATH SOC, V83, P633 DUDA R, 1968, FUND MATH, V62, P265 ILLANES A, 1991, TOPOLOGY P, V16, P63 ILLANES A, 1995, GLASNIK MAT, V30, P285 ILLANES A, 1999, MONOGRAPHS TXB PURE, V216 ILLANES A, 2001, TOPOL APPL, V113, P61 INGRAM WT, 1991, CANAD MATH B, V34, P351 LOPEZ MD, 2002, TOPOL APPL, V126, P361 MACIAS S, 1997, P AM MATH SOC, V125, P3069 MASSEY WS, 1977, GRADUTATE TEXTS MATH, V56 MOORE RL, 1962, FDN POINT SET THEORY, V13 NADLER SB, 1977, T AM MATH SOC, V230, P321 NADLER SB, 1978, MONOGRAPHS TXB PURE, V49 ROGERS JT, 1971, P AM MATH SOC, V29, P165 ROGERS JT, 1972, CAN J MATH, V24, P279 ROGERS JT, 1973, GEN TOPOL APPL, V3, P283 SHERLING DD, 1983, CAN J MATH, V35, P1030 NR 18 TC 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-8641 J9 TOPOL APPL JI Topology Appl. PD DEC 10 PY 2002 VL 126 IS 3 BP 377 EP 391 PG 15 SC Mathematics, Applied; Mathematics GA 616WU UT ISI:000179327000006 ER PT J AU Mendez-Lango, H TI Some dynamical properties of mappings defined on Knaster continua SO TOPOLOGY AND ITS APPLICATIONS LA English DT Article DE inverse limit space; Knaster continuum; topological entropy AB We present an arc-like continuum X and a mapping f : X --> X with the following properties: The set of recurrent points of f is dense in X; f has no periodic points other than fixed points; and the topological entropy of f is positive. This example allows us to answer one question due to J.J. Charatonik and another question due to M. Barge. (C) 2002 Elsevier Science B.V. All rights reserved. C1 UNAM, Fac Ciencias, Dept Matemat, Mexico City 04510, DF, Mexico. RP Mendez-Lango, H, UNAM, Fac Ciencias, Dept Matemat, Ciudad Univ, Mexico City 04510, DF, Mexico. CR BARGE M, 1987, HOUSTON J MATH, V13, P465 BLOCK LS, 1992, LECT NOTES MATH, V1513 CHARATONIK JJ, 1998, PUBL I MATH, V63, P131 COVEN EM, 1980, P AM MATH SOC, V79, P316 LEWIS W, 1991, CONT MATH, V117, P99 MINC P, 1992, TOPOL APPL, V46, P99 MISIUREWICZ S, 1980, STUD MATH, V67, P45 NADLER SB, 1992, PURE APPL MATH, V158 WALTERS P, 1982, GRADUATE TEXTS MATH, V79 NR 9 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-8641 J9 TOPOL APPL JI Topology Appl. PD DEC 10 PY 2002 VL 126 IS 3 BP 419 EP 428 PG 10 SC Mathematics, Applied; Mathematics GA 616WU UT ISI:000179327000009 ER PT J AU Miki-Yoshida, M Collins-Martinez, V Amezaga-Madrid, P Aguilar-Elguezabal, A TI Thin films of photocatalytic TiO2 and ZnO deposited inside a tubing by spray pyrolysis SO THIN SOLID FILMS LA English DT Article DE photocatalytic tubing; spray pyrolysis; titanium dioxide; zinc oxide ID SOL-GEL METHOD; OPTICAL-PROPERTIES; OXIDE; DEGRADATION; WATER; NB AB Thin films of photocatalytic TiO2 and ZnO were deposited in Vycor tubing by a simple and reproducible spray pyrolysis technique. Films were transparent and non-light scattering. Film characterization by transmission electron microscopy shows that titanium oxide films were polycrystalline and that their structure corresponded to the tetragonal anatase phase, In addition, ZnO films were polycrystalline with a structure that belonged to the hexagonal Wurtzite type, The solar photocatalytic efficiency for butane degradation was compared to that of Degussa P-25 TiO2 powder (P-25). Reaction rate and reaction order were obtained from butane concentration measurements using the tubing as a non-circulating reactor exposed to solar radiation, The best fitting was obtained for a pseudo-first order rate constant. The TiO2-covered tubing shows very high photocatalytic activity, even higher than that of P-25, if activity per unit of catalyst mass is considered. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Ctr Invest Mat Avanzados, Chihuahua 31109, Mexico. RP Miki-Yoshida, M, Ctr Invest Mat Avanzados, Miguel Cervantes 120, Chihuahua 31109, Mexico. CR *JOINT COMM POWD D, 1996, 211272 ICDD *POWD DIFF FIL JOI, 1996, 361451 ICDD ATASHBAR MZ, 1998, THIN SOLID FILMS, V326, P238 BADAWY WA, 1997, J MATER SCI, V32, P4979 BORELLO R, 1989, ENVIRON TOXICOL CHEM, V8, P997 DUMITRIU D, 2000, APPL CATAL B-ENVIRON, V25, P83 FUJISHIMA A, 1972, NATURE, V238, P37 FUJISHIMA A, 2000, J PHOTOCH PHOTOBIO C, V1, P1 GAUTHIER V, 1999, THIN SOLID FILMS, V340, P175 HEAVENS OS, 1991, OPTICAL PROPERTIES T, P115 HERRMANN JM, 1999, CATAL TODAY, V53, P115 JACOBY WA, 1998, ENVIRON SCI TECHNOL, V32, P2650 KORMANN C, 1989, J PHOTOCH PHOTOBIO A, V48, P161 LEPRINCEWANG Y, 1997, THIN SOLID FILMS, V307, P38 LINDSTROM H, 2001, NANO LETTERS, V1, P97 NATARAJAN C, 1998, THIN SOLID FILMS, V322, P6 NAVIO JA, 1999, APPL CATAL A-GEN, V177, P111 PATIL PS, 1999, MATER CHEM PHYS, V59, P185 PAZ Y, 1997, J MATER RES, V12, P2759 RAHMAN MM, 1999, J PHYS CHEM SOLIDS, V60, P201 STROMME M, 1996, J APPL PHYS, V79, P3749 SUNADA K, 1998, ENVIRON SCI TECHNOL, V32, P726 TAKIKAWA H, 1999, THIN SOLID FILMS, V348, P145 TANAKA K, 1996, J PHOTOCH PHOTOBIO A, V101, P85 ZAKRZEWSKA K, 1997, THIN SOLID FILMS, V310, P161 NR 25 TC 4 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 1 PY 2002 VL 419 IS 1-2 BP 60 EP 64 PG 5 SC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter GA 616AW UT ISI:000179280400010 ER PT J AU Vidal, J de Melo, O Vigil, O Lopez, N Contreras-Puente, G Zelaya-Angel, O TI Influence of magnetic field and type of substrate on the growth of ZnS films by chemical bath SO THIN SOLID FILMS LA English DT Article DE deposition process; semiconductors; structural properties; zinc sulfide ID THIN-FILMS; SOLAR-CELLS; DEPOSITION; BUFFER AB Optical and structural characterization of ZnS thin films grown by chemical bath deposition (CBD), introducing for the First time a magnetic field (MF), are reported. Coming glass as well as Si and GaAs single crystals were used substrates, The effect of H-2-annealing, in the range of temperature 200-300 degreesC, and MF on the morphology and crystalline structure of films is studied in atomic force microscopy images and in X-ray diffractograms. MF does riot manifest appreciable influence on the grain size (GS) when glass substrates are used. On the contrary GS diminishes noticeably when MF is applied on ZnS/Si and ZnS/ GaAs CBD-growths. Further, an improvement of the optical properties with post-growth annealing in H-2, as exhibited by optical transmission, is obtained. An application of these ZnS films as antireflective coating is analyzed by reflectance spectra. (C) 2002 Elsevier Science B.V. All rights reserved. C1 IPN, Dept Fis, Ctr Invest & Estud Avanzados, Mexico City 07360, DF, Mexico. Inst Politecn Nacl, Escuela Super Fis & Matemat, Mexico City 07738, DF, Mexico. Univ Havana, Fac Phys, IMRE, Havana 10400, Cuba. RP Zelaya-Angel, O, IPN, Dept Fis, Ctr Invest & Estud Avanzados, POB 14-740, Mexico City 07360, DF, Mexico. CR AVEN M, 1967, PHYSICS CHEM 2 6 COM, P722 CONTRERASPUENTE G, 2000, THIN SOLID FILMS, V361, P378 DEMELO O, 1994, APPL PHYS LETT, V65, P1278 DONA JM, 1994, J ELECTROCHEM SOC, V141, P205 HASHIMOTO Y, 1998, SOL ENERG MAT SOL C, V50, P71 HASS G, 1966, PHYS THIN FILMS, V2, P327 HUANG L, 1994, J ELECTROCHEM SOC, V141, P2536 KITAEV GA, 1967, IAN SSSR NEORG MATER, V3, P473 KUSHIYA K, 1997, P 26 IEEE PHOT SPEC, P327 MICHALSEN RA, 1982, P 16 IEEE PHOT SPEC, P781 VIDAL J, 1999, MATER CHEM PHYS, V61, P139 VIGIL O, 1998, THIN SOLID FILMS, V322, P329 WIRTHL E, 1995, J CRYST GROWTH, V146, P404 NR 13 TC 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 1 PY 2002 VL 419 IS 1-2 BP 118 EP 123 PG 6 SC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter GA 616AW UT ISI:000179280400019 ER PT J AU Osuna, MR Aguirre, G Somanathan, R Molins, E TI Asymmetric synthesis of amathamides A and B: novel alkaloids isolated from Amathia wilsoni SO TETRAHEDRON-ASYMMETRY LA English DT Article ID KIRKPATRICK; INHIBITOR AB Syntheses of the amathamides A and B ((2S)-N-[(E and Z)-2(2,4-dibromo-5-methoxyphenylethenyl]-1-methyl-2-pyrrolinecarboxamide s), new alkaloids isolated from the Tasmanian marine bryozoan Amathia wilsoni, were accomplished by a sequence of reactions starting from 3-hydroxybenzaldehyde. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Ctr Grad & Invest, Inst Tecnol Tijuana, Tijuana 22000, BC, Mexico. CSIC, Inst Ciencia Mat Barcelona, Cerdanyola Del Valles 08193, Barcelona, Spain. RP Somanathan, R, Ctr Grad & Invest, Inst Tecnol Tijuana, Apartado Postal 1166, Tijuana 22000, BC, Mexico. EM gaguirre@tectijuana.mx somanatha@sundown.sdsu.edu CR AGUIRRE G, 1998, J FLUORINE CHEM, V90, P5 ANDERSEN RJ, 1978, TETRAHEDRON LETT, V19, P2541 ANDERSEN RJ, 1979, CAN J CHEM, V57, P2325 AZUMI K, 1990, BIOCHEMISTRY-US, V29, P159 BLACKMAN AJ, 1985, HETEROCYCLES, V23, P2829 BLACKMAN AJ, 1987, AUST J CHEM, V40, P1655 BLACKMAN AJ, 1989, J NAT PRODUCTS, V52, P436 BRUENING RC, 1986, J NAT PRODUCTS, V49, P193 BURKE BA, 1978, TETRAHEDRON LETT, P2723 BURKE BA, 1985, HETEROCYCLES, V23, P257 CHATTERJEE A, 1975, AUST J CHEM, V28, P457 GALANIS DL, 1997, J ORG CHEM, V62, P8968 GOURNELIS DC, 1995, NAT PROD REP, P75 GOVINDACHARI TR, 1983, PHYTOCHEMISTRY, V22, P755 HODGSON HH, 1925, J CHEM SOC 1, V127, P875 KAGAMIZONO T, 1997, TETRAHEDRON LETT, V38, P1223 KENDE AS, 1991, TETRAHEDRON LETT, V32, P1699 KIM JW, 1999, J ORG CHEM, V64, P153 KIRKUP MP, 1983, TETRAHEDRON LETT, V24, P2087 MORRIS BD, 1999, J NAT PROD, V62, P688 OBRECHT J, 1987, J CHEM SOC CHEM COMM, P1219 OHJUMA K, 1962, J ANTIBIOT, V15, P115 OLTZ EM, 1988, J AM CHEM SOC, V110, P6162 SOMANATHAN R, 1996, SYNTHETIC COMMUN, V26, P1023 UMEZAWA H, 1986, J ANTIBIOT, V39, P170 WALLS JT, 1991, J CHEM ECOL, V17, P1871 WALLS JT, 1995, HYDROBIOLOGIA, V297, P163 NR 27 TC 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0957-4166 J9 TETRAHEDRON-ASYMMETRY JI Tetrahedron: Asymmetry PD OCT 18 PY 2002 VL 13 IS 20 BP 2261 EP 2266 PG 6 SC Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical GA 616PC UT ISI:000179311300014 ER PT J AU Obrador, GT Pereira, BJG Kausz, AT TI Chronic kidney disease in the United States: An underrecognized problem SO SEMINARS IN NEPHROLOGY LA English DT Review ID CHRONIC DIALYSIS PATIENTS; RENAL-DISEASE; RISK-FACTORS; HOSPITAL UTILIZATION; SERUM CREATININE; MORTALITY; HEALTH; PREDICTORS; INSUFFICIENCY; PROGRESSION C1 Tufts Univ New England Med Ctr, Div Nephrol, Boston, MA 02111 USA. Tufts Univ, Sch Med, Boston, MA 02111 USA. Univ Panamericana, Sch Med, Mexico City, DF, Mexico. RP Pereira, BJG, Tufts Univ New England Med Ctr, Div Nephrol, 750 Washington St, Boston, MA 02111 USA. CR 2002, AM J KIDNEY DIS, V39, S1 *NIH NAT I DIAB DI, 1999, US REN DAT SYST 1999 *NIH NAT I DIAB DI, 2000, US REN DAT SYST 2000 *NIH NAT I DIAB DI, 2001, US REN DAT SYST 2001 ALAHMAD A, 2001, J AM COLL CARDIOL, V38, P955 ARORA P, 2000, J AM SOC NEPHROL, V11, P740 BROWN WW, 2001, J AM SOC NEPHROL, V12, A193 CULLETON BF, 1999, KIDNEY INT, V56, P2214 DEOREO PB, 1997, AM J KIDNEY DIS, V30, P204 FRIED LP, 1998, JAMA-J AM MED ASSOC, V279, P585 GIATRAS I, 1997, ANN INTERN MED, V127, P337 HOLLAND DC, 2000, NEPHROL DIAL TRANSPL, V15, P650 HUNSICKER LG, 1997, KIDNEY INT, V51, P1908 JONES CA, 1998, AM J KIDNEY DIS, V32, P992 JONES CA, 2002, AM J KIDNEY DIS, V39, P445 KHAN SS, 2002, KIDNEY INT, V62, P229 KISSMEYER L, 1999, NEPHROL DIAL TRANSPL, V14, P2150 LEVEY AS, 1996, J AM SOC NEPHROL, V7, P2616 LEVEY AS, 1999, ANN INTERN MED, V130, P461 LEVEY AS, 2000, J AM SOC NEPHROL, V11, A155 MCCLELLAN WM, 1991, J CLIN EPIDEMIOL, V44, P83 MCCLELLAN WM, 1997, AM J KIDNEY DIS, V29, P368 MUNTNER P, 2002, J AM SOC NEPHROL, V13, P745 NISSENSON AR, 2001, AM J KIDNEY DIS, V37, P1177 PEREIRA BJG, 2000, KIDNEY INT, V57, P351 POPOVIC JR, 2000, VITAL HLTH STAT 13, V148, P1 ROCCO MV, 1996, J AM SOC NEPHROL, V7, P889 THAMER M, 1996, J AM SOC NEPHROL, V7, P751 NR 28 TC 12 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 USA SN 0270-9295 J9 SEMIN NEPHROL JI Semin. Nephrol. PD NOV PY 2002 VL 22 IS 6 BP 441 EP 448 PG 8 SC Urology & Nephrology GA 615ZB UT ISI:000179276300002 ER PT J AU Correa-Rotter, R TI APD in the developing world: Is there a future? SO SEMINARS IN DIALYSIS LA English DT Article ID PERITONEAL-DIALYSIS; COST AB Automated peritoneal dialysis (APD) has experienced significant growth in highly developed nations in the last few years, while in developing countries with important social, educational, and financial constraints this treatment modality is, at best, trying to emerge. APD offers advantages that make it popular. Some of these advantages include increased adequacy for some patient groups, enhanced patient well-being and positive changes in lifestyle, as well as a reduction in peritonitis rates attributed to fewer connect-disconnect procedures. The development of APD in developing nations has been very poor mainly due to educational and financial constraints. APD growth as a treatment modality in the developing world requires multiple approaches, some of them general and others related to the specific needs of each nation. There is a need to develop APD research projects and pilot programs to demonstrate the benefits for specific subpopulations. In addition, the development of research and industry-market strategies directed at reducing costs related to this form of treatment are required. The relatively low use of APD in developing nations is primarily influenced by nonmedical factors. Given the financial and educational constraints, APD programs may need to be directed toward specific subpopulations such as young working adults, individuals who require assistance to perform procedures, or patients who require an increased dialysis dose in order to reach adequate clearances. C1 Natl Autonomous Univ Mexico, Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Nephrol & Mineral Metab, Mexico City 14000, DF, Mexico. RP Correa-Rotter, R, Natl Autonomous Univ Mexico, Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Nephrol & Mineral Metab, Vasco Quiroga 15, Mexico City 14000, DF, Mexico. CR *SOC LAT NEFR HIP, 1998, REG LAT DIAL TRANSPL *US REN DAT SYST, 1998, AM J KIDNEY DIS S, V32, S81 CHENG IKP, 1996, PERITON DIALYSIS INT, V16, S381 CHUGH KS, 1999, TRANSPLANT P, V31, P3275 CORREAROTTER R, 2001, PERITON DIALYSIS S3, V21, S314 LOCATELLI AJ, 1999, ADV PERIT D, V15, P193 NISSENSON AR, 1993, KIDENY INT S40, V43, S120 PERRY D, 1998, ADV PERIT D, V14, P57 RODRIGUEZCARMONA A, 1996, ADV PERIT D, V12, P93 SAIEHANDONIE C, 1990, PEDIATR NEPHROL, V4, P199 SESSO R, 1990, INT J TECHNOL ASSESS, V6, P107 WERE AJO, 1995, E AFR MED J, V72, P69 NR 12 TC 0 PU BLACKWELL PUBLISHING INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 USA SN 0894-0959 J9 SEMIN DIALYSIS JI Semin. Dial. PD NOV-DEC PY 2002 VL 15 IS 6 BP 385 EP 387 PG 3 SC Urology & Nephrology GA 615ZL UT ISI:000179277200003 ER PT J AU Rubluo, A Marin-Hernandez, T Duval, K Vargas, A Marquez-Guzman, J TI Auxin induced morphogenetic responses in long-term in vitro subcultured Mammillaria san-angelensis Sanchez-Mejorada (Cactaceae) SO SCIENTIA HORTICULTURAE LA English DT Article DE endangered species; Cactaceae; auxins action; areole activation; growth regulators; histology development; tissue culture ID CULTURE; INVITRO AB Observations were made as to the influence of auxins, as the sole exogenous growth regulator, on the morphogenesis of long-term in vitro subcultured plantlets of the severely endangered cacti Mammillaria san-angelensis. Sections of long-term subcultured shoots were exposed to different auxins at various concentrations, and plant regeneration was recorded as a direct effect of auxin concentration. It was found that morphogenetic potentiality was retained in long-term subcultures, and that the best regeneration was seen in the presence of IAA (34.25 muM). Histological analysis revealed two processes leading to regeneration: de novo production of shoots and axillary meristem activation. Of the two, de novo shoot production was found to occur both in controls and in explants growing in the presence of IAA, while axillary meristem activation was observed only in the presence of IAA. (C) 2002 Elsevier Science B.V. All rights reserved. C1 UNAM, Bot Garden Inst Biol, Mexico City 04510, DF, Mexico. INIFAP, Lab Germoplasm & Biotechnol, Mexico City 04110, DF, Mexico. UNAM, ENEP Iztacala, Mexico City, DF, Mexico. UNAM, Fac Sci, Dept Biol, Mexico City 04510, DF, Mexico. RP Rubluo, A, UNAM, Bot Garden Inst Biol, Circuito Exterior S-N, Mexico City 04510, DF, Mexico. CR BOKE NH, 1958, AM J BOT, V45, P473 BRAVOHOLLIS H, 1991, CACTACEAS MEXICO, V3 CHATURVEDI HC, 1994, PLANT CELL TISS ORG, V38, P73 CLINE MG, 1994, PHYSIOL PLANTARUM, V90, P230 DABEKAUSSEN MAA, 1991, SCI HORTIC-AMSTERDAM, V46, P283 GEORGE EF, 1993, PLANT PROPAGATION 1 HUBSTENBERGER JF, 1992, BIOTECHNOLOGY AGR FO, V20, P49 HUTABARAT D, 1986, P S NUCL TECHN IN VI, P187 JOHANSEN D, 1940, PLANT MICROTECHNIQUE MARTINEZVAZQUEZ O, 1989, J HORTIC SCI, V64, P99 MAUSETH JD, 1975, AM J BOT, V62, P869 MURASHIGE T, 1962, PHYSIOL PLANTARUM, V15, P473 PALOMINO G, 1999, PLANT SCI, V141, P191 REYES I, 1995, IN VITRO 2, V31, A52 RODRIGUEZGARAY B, 1992, CACTUS SUCCULENT J, V64, P116 RUBLOU A, 1997, BIOTECHNOLOGY AGR FO, V6, P193 RUBLUO A, 1993, BIOL CONSERV, V63, P163 TRAVAWAS A, 1981, PLANT CELL ENVIRON, V4, P203 NR 18 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-4238 J9 SCI HORT-AMSTERDAM JI Sci. Hortic. PD NOV 15 PY 2002 VL 95 IS 4 BP 341 EP 349 PG 9 SC Horticulture GA 617CT UT ISI:000179343200008 ER PT J AU Sala, E Aburto-Oropeza, O Paredes, G Parra, I Barrera, JC Dayton, PK TI A general model for designing networks of marine reserves SO SCIENCE LA English DT Article ID REEF FISHES; CONNECTIVITY; MANAGEMENT; POPULATION; RETENTION; HABITAT AB There is debate concerning the most effective conservation of marine biodiversity, especially regarding the appropriate location, size, and connectivity of marine reserves. We describe a means of establishing marine reserve networks by using optimization algorithms and multiple levels of information on biodiversity, ecological processes (spawning, recruitment, and larval connectivity), and socioeconomic factors in the Gulf of California. A network covering 40% of rocky reef habitat can fulfill many conservation goals while reducing social conflict. This quantitative approach provides a powerful tool for decision-makers tasked with siting marine reserves. C1 Univ Calif San Diego, Scripps Inst Oceanog, Ctr Marine Biodivers & Conservat, La Jolla, CA 92093 USA. Univ Autonoma Baja California, La Paz, Baja Calif Sur, Mexico. World Wildlife Fund, Gulf Calif Program, Hermosillo, Sonora, Mexico. RP Sala, E, Univ Calif San Diego, Scripps Inst Oceanog, Ctr Marine Biodivers & Conservat, La Jolla, CA 92093 USA. CR *NAT RES COUNC, 2001, MAR PROT AR TOOLS SU AIRAME S, IN PRESS ECOL APPL ALLISON GW, 1998, ECOLOGICAL APPL, V8, P79 BOTSFORD LW, 2001, ECOL LETT, V4, P144 CABEZA M, 2001, TRENDS ECOL EVOL, V16, P242 CARR MH, 1993, CAN J FISH AQUAT SCI, V50, P2019 CASTILLA JC, 1999, TRENDS ECOL EVOL, V14, P280 COWEN RK, 2000, SCIENCE, V287, P857 DAYTON PK, 2000, B MAR SCI, V66, P617 HASTINGS A, 1999, SCIENCE, V284, P1537 KINLAN BP, IN PRESS ECOLOGY LAUCK T, 1998, ECOL APPL, V8, P72 LESLIE H, IN PRESS ECOL APPL LOCKWOOD DR, 2002, THEOR POPUL BIOL, V61, P297 LUBCHENCO J, IN PRESS ECOL APPL MALAKOFF D, 2002, SCIENCE, V296, P245 MANGEL M, 2000, ECOL LETT, V3, P15 MUSICK JA, 2000, FISHERIES, V25, P6 OGDEN JC, 1997, SCIENCE, V278, P1414 PALUMBI SR, 2001, MARINE COMMUNITY ECO, P509 ROBERTS CM, 1997, SCIENCE, V278, P1454 ROBERTS CM, 2001, SCIENCE, V294, P1920 ROBERTS CM, 2002, SCIENCE, V295, P1280 ROBERTSON DR, 2001, P NATL ACAD SCI USA, V98, P5667 SALA E, IN PRESS B MAR SCI SALA E, UNPUB SWEARER SE, 1999, NATURE, V402, P799 WARD TJ, 1999, ECOL APPL, V9, P691 WARNER RR, 2000, B MAR SCI, V66, P821 NR 29 TC 33 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD DEC 6 PY 2002 VL 298 IS 5600 BP 1991 EP 1993 PG 3 SC Multidisciplinary Sciences GA 622CP UT ISI:000179629200045 ER PT J AU Moreno-Corral, MA Chavarria, C de Lara, E TI CCD imagery, uvby beta photometry, and the physical parameters of Haffner 19 SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE HII regions; open clusters and associations, individual : Haffner 19, Haffner 18ab, NGC 2467; techniques : photometric ID STELLAR MODELS; EXTINCTION; CLUSTERS; STARS; GRIDS AB We present broad-band UBV(RI)(c) CCD imagery of 334 stars in the direction of the Galactic cluster Haffner 19. The sample is complete to m(lambda) = 19 (lambda = U, B, V, R, I).. We reliably establish the cluster membership for 102 stars based upon their locations in the (V, B-V), (V, V-I), (I, R-I), (U-B, B-V), and (VR, V-I) diagrams, thus increasing three-fold the number of known cluster members. With the Q-method we determine the MK spectral types of the 33 brightest stars, confirming that 29 belong to the cluster's young population (15 B0-B1 and 14 B2-B9 main sequence stars). Complementary vvbybeta photoelectric photometry of 6 bright stars independently confirms the distance and reddening to the cluster. Our narrow-baud Halpha, [N II], and [S II] imagery reveals the presence of a Stremgren sphere and we derive its properties. From our photometric data and by four different means we find that the best distance estimate to the cluster is 5.2 +/- 0.4 kpc, with a fairly homogeneous reddening of EB-V = 0.42 +/- 0.01. The data constrain the age of the cluster to be between 10(6) and less than or equal to 3.7 x 10(6) years, with 2 x 10(6) yr as its most "likely estimate. Because of its young age, it is not possible to derive a reliable estimate for its metallicity. Finally; we present radial velocities of Haffner 18ab, 'Haffner 19, and NGC 2467, which place the last two of these at the same distance. C1 UNAM, Inst Astron, Ensenada 22860, Baja California, Mexico. RP Moreno-Corral, MA, UNAM, Inst Astron, Carretera Tijuana Ensenada Km 103, Ensenada 22860, Baja California, Mexico. CR CHAVARRIA A, 2001, USERS MANUAL RAINBOW CHAVARRIA K, 1988, ASTRON ASTROPHYS, V197, P151 CLARET A, 1992, ASTRON ASTROPHYS SUP, V96, P255 COURTES G, 1972, VISTAS ASTRON, P81 CRAWFORD DL, 1979, ASTRON J, V84, P1858 FELLI M, 1978, A A, V69, P199 FICH M, 1989, ASTROPHYS J, V342, P272 FITZGERALD MP, 1974, ASTRON J, V79, P873 FITZGERALD MP, 1976, ASTRON ASTROPHYS, V50, P149 GEORGELIN YP, 1970, A A, V6, P347 GRONBECH B, 1976, ASTRON ASTROPHYS S, V26, P155 HAFFNER H, 1957, Z ASTROPHYS, V43, P89 JOHNSON HL, 1953, ASTROPHYS J, V117, P313 LAMLA E, 1982, LANDOLTBORNSTEIN B, V2 LESTER JB, 1986, ASTROPHYS J SUPPL S, V61, P509 LODEN LO, 1965, APJ, V141, P668 MATHIS JS, 1990, ANNU REV ASTRON ASTR, V28, P37 MITCHELL RI, 1960, APJ, V132, P68 MOITINHO A, 2000, THESIS I ASTROFISICA MOITINHO A, 2001, ASTRON ASTROPHYS, V370, P436 MORENOCORRAL MA, 1993, ASTRON ASTROPHYS, V273, P619 MORO D, 2000, A AS, V147, P629 MUNARI U, 1996, MON NOT R ASTRON SOC, V283, P905 NISSEN P, 1984, USERS MANUAL DANISH OLSEN EH, 1983, ASTRON ASTROPHYS SUP, V54, P55 OLSEN EH, 1984, ASTRON ASTROPHYS S, V57, P443 OSTERBROCK DE, 1974, ASTROPHYSICS GASEOUS PISMIS P, 1976, REVMEXAA, V1, P373 SCHAERER D, 1993, ASTRON ASTROPHYS SUP, V102, P339 SCHALLER G, 1992, ASTRON ASTROPHYS SUP, V96, P269 SCHMIDTKALER T, 1982, LANDOLTBORNSTEIN B, V2 SCHUSTER W, 1988, A AS, V73, P227 SCHUSTER WJ, 2001, REV MEX ASTRON ASTR, V37, P187 TAYLOR BJ, 1986, ASTROPHYS J SUPPL S, V60, P577 NR 34 TC 1 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 141 EP 159 PG 19 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200003 ER PT J AU Rodriguez, M Rodriguez, LF Gyulbudaghian, AL May, J TI VLA detection of the exciting sources of the HH 288 and HHL59 outflows SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE ISM : jets and outflows; stars : formation; stars : mass loss; radio continuum : stars AB We present VLA observations at 3.6 cm of three fields containing molecular outflows, including the HHL59 region, whose CO molecular flow is reported here. We detected candidates for the exciting sources of the molecular outflows in the three fields observed: L1287, HH 288, and HHL59. The exciting source of L1287 has been reported previously, but those toward HH 288 and HHL59 are her presented for the first time. We discuss the parameters of these sources, and their relation with sources detected at other wavelengths. C1 UNAM, Inst Astron, Morelia 58090, Michoacan, Mexico. Byurakan Astrophys Observ, Byurakan, Armenia. Univ Chile, Dept Astron, Santiago, Chile. RP Rodriguez, M, UNAM, Inst Astron, Apdo Postal 3-72,Campus Morelia, Morelia 58090, Michoacan, Mexico. CR ANGLADA G, 1994, APJ, V420, L92 ANGLADA G, 1996, ASTR SOC P, V93, P3 ANGLADA G, 1997, ASTRON ASTROPHYS SUP, V121, P255 ANGLADA G, 1998, ASTRON J, V116, P2953 BECKWITH SVW, 1991, ASTROPHYS J, V381, P250 DENT WRF, 1998, MNRAS, V301, P1053 DUTRA CM, 2000, ASTRON ASTROPHYS, V359, L9 FUKUI Y, 1993, PROTOSTARS PLANETS, V3, P603 GUETH F, 2001, ASTRON ASTROPHYS, V375, P1018 GYULBUDAGHIAN AL, 1983, SOV ASTRON LETT, V8, P123 GYULBUDAGHIAN AL, 1987, REV MEX ASTRON ASTR, V15, P53 MCCAUGHREAN MJ, 2002, UNPUB RODRIGUEZ LF, 1997, IAU S, V182, P83 SEPULVEDA I, 2001, THESIS U BARCELONA STAUDE HJ, 1991, A A, V244, L13 TORRELLES JM, 1984, REVMEXAA, V8, P149 NR 16 TC 2 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 161 EP 167 PG 7 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200004 ER PT J AU Girart, JM Curiel, S Rodriguez, LF Canto, J TI Radio continuum observations towards optical and molecular outflows SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE ISM : individual; L1489, HH 68-69, HH 94-95, NGC 2264D, L1681B, L778, V645CYG, MWC 1080; ISM : jets and outflows; stars : formation ID HERBIG-HARO OBJECTS; YOUNG STELLAR OBJECTS; OPHIUCHI DARK CLOUD; STAR-FORMING REGIONS; H2O MASER SOURCE; T-TAURI STARS; AE/BE STARS; EXCITING SOURCES; BIPOLAR OUTFLOW; CIRCUMSTELLAR DISKS AB We present multi-frequency VLA continuum observations towards 8 star forming regions with molecular and optical outflows: L1489, HH 68-69, HH 94-95, NGC 2264D, L1681B, L778, MWC 1080 and V645 Cyg. We detect three thermal radio jets, L1489, YLW 16A in L1681B and NGC 2264D VLA 7, associated with molecular and/or HH outflows. The L1489 and NGC 2264D VLA 7 thermal radio jets appear elongated in the direction of the larger scale outflow. We report the first tentative detection of a non-thermal radio jet, L778 VLA 5, associated with a low mass Class I protostar and powering a molecular outflow. For HH 68-69, HH 94-95 and the molecular outflow in NGC 2264D we could not identify a candidate for the exciting source of these outflows. The radio emission associated with V645 Cyg is quite extended, similar to 0.1 pc, and time variable. We detect three radio sources in the MWC 1080 region that could be associated with YSOs. C1 Univ Barcelona, Dept Astron & Meteorol, E-08028 Barcelona, Catalunya, Spain. Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. UNAM, Inst Astron, Morelia 58090, Michoacan, Mexico. RP Girart, JM, Univ Barcelona, Dept Astron & Meteorol, Av Diagonal 647, E-08028 Barcelona, Catalunya, Spain. CR ANDRE P, 1987, ASTRON J, V93, P1182 ANDRE P, 1994, ASTROPHYS J, V420, P837 ANDRE P, 1997, IAU S, V182, P483 ANGLADA G, 1992, ASTROPHYS J, V395, P494 ANGLADA G, 1994, APJ, V420, L91 ANGLADA G, 1996, ASTR SOC P, V93, P3 ANGLADA G, 1998, ASTRON J, V116, P2953 AVILA R, 2001, REV MEX ASTRON ASTR, V37, P201 BARSONY M, 1997, ASTROPHYS J SUPPL S, V112, P109 BECKER RH, 1991, APJS, V75, P1 BEICHMAN CA, 1986, ASTROPHYS J, V307, P337 BELTRAN MT, 2001, ASTRON J, V121, P1556 BONTEMPS S, 1996, A A, V858, P872 CANTO J, 1984, ASTROPHYS J, V282, P631 CASANOVA S, 1995, ASTROPHYS J 1, V439, P752 CASTELAZ MW, 1988, APJ, V335, P150 COHEN M, 1977, ASTROPHYS J, V215, P533 COHEN M, 1985, ASTROPHYS J, V296, P633 COHEN M, 1990, ASTROPHYS J, V354, P701 CONDON JJ, 1998, ASTRON J, V115, P1693 CURIEL S, 1989, ASTROPHYS LETT COMM, V27, P299 CURIEL S, 1989, REV MEX ASTRON ASTR, V17, P137 CURIEL S, 1990, APJ, V365, L85 DENT WRF, 1998, MON NOT R ASTRON SOC, V301, P1049 DIFRANCESCO J, 1997, ASTROPHYS J 1, V482, P433 FUENTE A, 1998, ASTRON ASTROPHYS, V334, P253 GIRART JM, 2000, ASTROPHYS J 2, V544, L153 GOMEZ JF, 1994, APJ, V438, P749 GOMEZ M, 1997, ASTRON J, V114, P1138 GOODRICH RW, 1986, ASTROPHYS J, V311, P882 GROSSO N, 2001, ASTRON ASTROPHYS, V370, L22 HARTIGAN P, 2000, PROTOSTARS PLANETS, V4, P841 HERBIG GH, 1960, AP J SUPPL, V4, P337 HEYER MH, 1990, ASTRON J, V99, P1585 HILLENBRAND LA, 1992, ASTROPHYS J, V397, P613 HOGERHEIJDE MR, 1998, ASTROPHYS J 1, V502, P315 HOGERHEIJDE MR, 2000, ASTROPHYS J 1, V534, P880 KAMATA Y, 1997, PUBL ASTRON SOC JPN, V49, P461 KWOK S, 1981, PASP, V93, P361 LADA CJ, 1981, AP J, V243, P769 LADA CJ, 1991, ASP C SER, V13, P3 LEINERT C, 1997, ASTRON ASTROPHYS, V318, P472 LEOUS JA, 1991, ASTROPHYS J, V379, P683 LEVREAULT RM, 1988, ASTROPHYS J SUPPL, V67, P283 LOPEZMOLINA MG, 1990, REV MEXICANA ASTRON, V20, P113 LUCAS PW, 2000, MON NOT R ASTRON SOC, V318, P526 MANNINGS V, 1994, MON NOT R ASTRON SOC, V271, P587 MARGULIS M, 1986, APJ, V309, L87 MARGULIS M, 1988, AP J, V333, P316 MENDOZA EE, 1990, MON NOT R ASTRON SOC, V246, P518 MIYAWAKI R, 1992, PASJ, V44, P557 MORRIS M, 1982, ASTRON ASTROPHYS, V111, P239 MYERS PC, 1987, ASTROPHYS J, V319, P340 MYERS PC, 1988, ASTROPHYS J, V324, P907 NAKANO M, 2000, PUBL ASTRON SOC JPN, V52, P437 NATTA A, 1993, ASTROPHYS J, V406, P674 NERI LJ, 1993, ASTRON ASTROPHYS SUP, V102, P201 OGURA K, 1998, PUBL ASTRON SOC AUST, V15, P91 OHASHI N, 1996, ASTROPHYS J 1, V466, P317 PADGETT DL, 1999, ASTRON J, V117, P1490 PIRZKAL N, 1997, ASTROPHYS J 1, V481, P392 POETZEL R, 1992, ASTRON ASTROPHYS, V262, P229 PRAVDO SH, 1985, APJ, V293, L35 REID MJ, 1995, ASTROPHYS J 1, V443, P238 REIPURTH B, 1988, ASTRON ASTROPHYS, V202, P219 REIPURTH B, 1989, ASTRON ASTROPHYS, V220, P249 REIPURTH B, 1993, ASTRON ASTROPHYS, V273, P221 RICHER JS, 2000, PROTOSTARS PLANETS, V4, P867 RODRIGUEZ LF, 1983, REV MEX ASTRON ASTR, V8, P163 RODRIGUEZ LF, 1997, IAU S, V182, P83 RODRIGUEZ LF, 1998, NATURE, V395, P355 RODRIGUEZ LF, 1998, REV MEX ASTRON ASTR, V34, P13 SCHULZ A, 1989, ASTROPHYS J, V341, P288 SEKIMOTO Y, 1997, ASTROPHYS J 2, V489, L63 SKINNER SL, 1990, APJ, V357, L39 SKINNER SL, 1993, ASTROPHYS J SUPPL S, V87, P217 STINE PC, 1988, AJ, V96, P1394 TORRELLES JM, 1989, ASTROPHYS J, V346, P756 VERDESMONTENEGRO L, 1991, ASTRON ASTROPHYS, V244, P84 WALKER CK, 1990, ASTROPHYS J, V349, P515 WALSH JR, 1992, MON NOT R ASTRON SOC, V257, P110 WHITE SM, 1992, ASTRON ASTROPHYS, V257, P557 WILKING BA, 1989, ASTROPHYS J, V340, P823 WILNER DJ, 1999, ASTROPHYS J 1, V513, P775 WILNER DJ, 2000, PROTOSTARS PLANETS, V4, P509 WOLFCHASE GA, 1995, ASTROPHYS J 1, V442, P197 WOOD K, 2001, ASTROPHYS J 1, V561, P299 YOSHIDA S, 1991, PASJ, V43, P362 YOSHIDA S, 1992, PUBL ASTRON SOC JPN, V44, P77 ZHOU SD, 1989, ASTROPHYS J, V346, P168 ZINNECKER H, 1992, ASTRON ASTROPHYS, V265, P726 ZINNECKER H, 1994, ASTRON ASTROPHYS, V292, P152 NR 92 TC 3 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 169 EP 186 PG 18 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200005 ER PT J AU Porras, A Rodriguez, LF Canto, J Curiel, S Torrelles, JM TI Evidence for time evolution in the exciting source of the expanding water maser bubble in Cepheus A SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE ISM : jets and outflows; stars : formation; stars : mass loss; radio continuum : stars ID STAR-FORMING REGION; RADIO OBSERVATIONS; YOUNG STAR; OUTFLOW; BIPOLAR; OBJECTS; DISK; EAST; CEP; HW2 AB We analyze VLA-A observations made at 6 cm towards the Cepheus A starforming region at three epochs: 1982.4, 1986.4, and 1990.2. We confirm that the thermal jet Cep A HW2 shows clear time variability in flux density and morphology. The radio-continuum source R5 is located about 0."6 south of Cep A HW2 and seems to be the exciting source of the expanding bubble of H2O masers detected with the VLBA. Our maps of the region suggest that the source R5 was considerably weaker in 1982.4 than in the other two later epochs, showing for the first time evidence of its time variability. This variability is consistent with that expected for an expanding H II region. We speculate that the "turn on" of the source R5 between 1982.4 and 1986.4 may be related with an enhancement in the mass loss of the nearby thermal jet Cep A HW2 during the same epoch. C1 UNAM, Inst Astron, Unidad Morelia, Morelia 58090, Michoacan, Mexico. UNAM, Inst Astron, Mexico City, DF, Mexico. IEEC, CSIC, E-08034 Barcelona, Spain. Inst Ciencias Espacio, CSIC, E-08034 Barcelona, Spain. RP Porras, A, UNAM, Inst Astron, Unidad Morelia, Apdo Postal 3-72, Morelia 58090, Michoacan, Mexico. CR BALLY J, 1991, ASP C SER, V14, P273 COHEN RJ, 1984, MON NOT R ASTRON SOC, V210, P425 CORNWELL TJ, 1985, ASTRON ASTROPHYS, V143, P77 GALLIMORE JF, 2002, 199 AAS M JAN GARAY G, 1996, ASTROPHYS J 1, V459, P193 GOMEZ JF, 1999, ASTROPHYS J 1, V514, P287 HOARE MG, 1995, ASTROPHYS J 1, V449, P874 HUGHES VA, 1982, ASTRON ASTROPHYS, V106, P171 HUGHES VA, 1984, ASTROPHYS J, V276, P204 HUGHES VA, 1988, ASTROPHYS J, V333, P788 HUGHES VA, 1991, ASTROPHYS J, V383, P280 HUGHES VA, 1995, MNRAS, V272, P469 HUGHES VA, 1997, ASTROPHYS J 1, V481, P857 MARTI J, 1998, ASTROPHYS J 1, V502, P337 MORIARTYSCHIEVE.GH, 1991, ASTROPHYS J, V374, P169 NARAYAN R, 1986, ANNU REV ASTRON ASTR, V24, P127 RODRIGUEZ LF, 1980, AP J, V235, P845 RODRIGUEZ LF, 1980, APJ, V240, L149 RODRIGUEZ LF, 2001, REV MEX ASTRON ASTR, V37, P95 RODRIGUEZ LF, 2002, ASTROPHYS J 1, V574, P179 SARGENT AI, 1977, ASTROPHYS J, V218, P736 SHU F, 1992, PHYSICS ASTROPHYSICS, V2 SPITZER L, 1978, PHYSICAL PROCESSES I TORRELLES JM, 1986, ASTROPHYS J, V305, P721 TORRELLES JM, 1993, ASTROPHYS J, V410, P202 TORRELLES JM, 1996, ASTROPHYS J 2, V457, L107 TORRELLES JM, 2001, ASTROPHYS J 1, V560, P853 TORRELLES JM, 2001, NATURE, V411, P277 NR 28 TC 3 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 187 EP 192 PG 6 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200006 ER PT J AU Voitsekhovich, VV Sanchez, LJ Orlov, VG TI Effect of scintillation on adaptive optics systems SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE atmospheric effects; instrumentation : adaptive optics methods : numerical ID TURBULENCE-INDUCED PHASE; TELESCOPE AB Image centroid measurements are the most used information in astronomical adaptive optics systems for the wavefront reconstruction. However, because in real observations these measurements are affected by scintillations, the reconstructed wavefront always contains some errors related to the scintillation effect. In this paper we investigate the influence of scintillations on the image centroid by means of computer simulations. The simulations have been performed for the case of weak-turbulence conditions for both varying and constant C-n(2) profile. The comparison of the results shows that there is no strong dependence on the form of the C-n(2) profile: rather the magnitude of the effect is determined mainly by two integral parameters of a C-n(2) profile: the integral turbulence strength (Fried parameter) and the scintillation level (intensity variance). C1 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. RP Voitsekhovich, VV, Univ Nacl Autonoma Mexico, Inst Astron, Apdo Postal 70-264,Cd Univ, Mexico City 04510, DF, Mexico. CR COLUCCI D, 1994, PUBL ASTRON SOC PAC, V106, P1104 KOUZNETSOV D, 1997, APPL OPTICS, V36, P464 LI H, 1993, P ICO 16 SAT C ACT A, P21 RIGAUT F, 1991, ASTRON ASTROPHYS, V250, P280 RIGAUT F, 1997, APPL OPTICS, V36, P2856 RODDIER F, 1981, PROGR OPTICS, V19, P281 TATARSKI VI, 1969, TT6850464 NAT SCI FD VOITSEKHOVICH VV, 1988, OPT ATMOSFERI, V1, P66 VOITSEKHOVICH VV, 1996, J OPT SOC AM A, V8, P1749 VOITSEKHOVICH VV, 1998, APPL OPTICS, V37, P4525 VOITSEKHOVICH VV, 1999, APPL OPTICS, V38, P3985 NR 11 TC 2 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 193 EP 198 PG 6 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200007 ER PT J AU Aceves, H Velazquez, H TI N-body simulations of small galaxy groups SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE galaxies : interactions; galaxies : kinematics; ICS and dynamics; methods : numerical ID COMPACT-GROUPS; DARK-MATTER; CLUSTERS; EVOLUTION; MASS; UNIVERSE; CATALOG AB A series of N-body simulations aimed at studying the dynamics of small groups of galaxies is presented. In particular, our results are compared with the dynamical properties of Hickson's compact groups (HCG). "Maximum expansion' and virial initial conditions are tested, and no primordial common dark halo is considered. The properties of small galaxy groups are very well reproduced, and those of Hickson's groups are well reproduced for the most advanced stage of collapsing groups. We find no overmerging problem in our simulations. An important fraction of groups (similar to 40%) initially in virial equilibrium can last for similar to 10 Gyr without complete merging. These results provide an alternative solution to the overmerging expected in Hickson's compact groups. Also, the mass-to-light ratio of HCG are probably similar to those found in clusters, suggesting that both kinds of systems have about the same fraction of barionic to total mass. C1 UNAM, Inst Astron, Ensenada 22860, Baja California, Mexico. RP Aceves, H, UNAM, Inst Astron, Apdo Postal 877, Ensenada 22860, Baja California, Mexico. CR AARSETH SJ, 1980, ASTROPHYS J, V236, P43 ACEVES H, 1999, ASTRON ASTROPHYS, V345, P439 AGUILAR LA, 1985, ASTROPHYS J, V295, P374 ATHANASSOULA E, 1997, MON NOT R ASTRON SOC, V286, P825 BAHCALL JN, 1981, ASTROPHYS J, V244, P805 BAHCALL NA, 1995, ASTROPHYS J LETT, V447, P81 BAHCALL NA, 1999, FORMATION STRUCTURE, P235 BARNES J, 1985, MON NOT R ASTRON SOC, V215, P517 BARNES J, 1986, NATURE, V324, P446 BARNES JE, 1989, NATURE, V338, P123 BODE PW, 1993, ASTROPHYS J, V416, P17 DIAFERIO A, 1994, ASTRON J, V107, P868 DUBINSKI J, 1996, NEW ASTRON, V1, P133 GELLER M, 1984, AP SS LIB, V111, P353 GOTT JR, 1974, ASTROPHYS J, V194, P543 GOTT JR, 1975, ASTRON ASTROPHYS, V45, P365 GOTT JR, 1975, ASTROPHYS J, V201, P296 GOTT JR, 1977, APJ, V213, P309 GOURGOULHON E, 1992, ASTRON ASTROPHYS, V255, P69 GOVERNATO F, 1996, ASTROPHYS J 1, V458, P18 GUNN JE, 1972, ASTROPHYS J, V176, P1 HEISLER J, 1985, ASTROPHYS J, V298, P8 HICKSON P, 1977, APJ, V214, P323 HICKSON P, 1982, AP J, V255, P382 HICKSON P, 1984, ASTROPHYSICAL SPACE, V111, P367 HICKSON P, 1992, ASTROPHYS J, V399, P353 HICKSON P, 1997, ANNU REV ASTRON ASTR, V35, P357 HRADECKY V, 2000, ASTROPHYS J 1, V543, P521 HUCHRA J, 1982, ASTROPHYS J, V257, P423 ISHIZAWA T, 1986, ASTROPHYS SPACE SCI, V119, P221 KUIJKEN K, 1995, MON NOT R ASTRON SOC, V277, P1341 MAKAROV DI, 2000, ASTR SOC P, V209, P40 MAMON GA, 1990, NASA C PUB 3098, V3098, P609 MAMON GA, 2000, ASTR SOC P, V209, P217 NOLTHENIUS R, 1987, MON NOT R ASTRON SOC, V225, P505 NOLTHENIUS R, 1993, ASTROPHYS J SUPPL S, V85, P1 PEACOCK JA, 1999, COSMOLOGICAL PHYSICS PUCHE D, 1991, ASTROPHYS J, V378, P487 RAMELLA M, 1994, ASTRON J, V107, P1623 RUBIN VC, 1991, APJS, V76, P153 SANDAGE A, 1961, APJ, V134, P916 SULENTIC JW, 1987, ASTROPHYS J, V322, P605 SULENTIC JW, 1997, ASTROPHYS J 1, V482, P640 VELAZQUEZ H, 2002, UNPUB REVMEXAA WHITE SDM, 1990, DYNAMICS INTERACTION, P380 WHITE SDM, 1993, NATURE, V366, P429 NR 46 TC 2 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 199 EP 214 PG 16 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200008 ER PT J AU Cruz, F Aguilar, LA Carpintero, DD TI A new method to find the potential center of N-body systems SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE globular clusters : general; methods : N-body simulations, numerical ID DISSIPATIONLESS COLLAPSE; SIMULATIONS; GALAXIES AB We present a new and fast method to find the potential center of an N-body distribution. The method uses an iterative algorithm which exploits the fact that the gradient of the potential is null at its center: it uses a smoothing radius to avoid getting trapped in secondary minima. We have tested this method on several random realizations of King models (in which the numerical computation of this center is rather difficult, due to the constant density within their cores), and compared its performance and accuracy against a more straightforward, but computer intensive method, based on cartesian meshes of increasing spatial resolution. In all cases, both methods converged to the same center, within the mesh resolution, but the new method is two orders of magnitude faster. We have also tested the method with one astronomical problem: the evolution of a 10(5) particle King model orbiting around a fixed potential that represents our Galaxy. We used a spherical harmonics expansion N-body code, in which the potential center determination is crucial for the correct, force computation. We compared this simulation with another one in which a method previously used to determine the expansion center is employed (White 1983). Our routine gives better results in energy conservation and mass loss. C1 UNAM, Inst Astron, Ensenada 22860, Baja California, Mexico. Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Astron Observ, RA-1900 La Plata, Argentina. Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina. RP Cruz, F, UNAM, Inst Astron, Apdo Postal 877, Ensenada 22860, Baja California, Mexico. CR AGUILAR LA, 1990, ASTROPHYS J, V354, P33 CLUTTONBROCK M, 1973, AP SS, V23, P55 CRUZ F, 1999, THESIS U NACL AUTONO MCGLYNN TA, 1984, ASTROPHYS J, V281, P13 MERRITT D, 1985, MON NOT R ASTRON SOC, V217, P787 SYER D, 1995, MON NOT R ASTRON SOC, V276, P1009 VILLUMSEN JV, 1982, MON NOT R ASTRON SOC, V199, P493 VILLUMSEN JV, 1984, ASTROPHYS J, V284, P75 WHITE SDM, 1983, ASTROPHYS J, V274, P53 NR 9 TC 0 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 225 EP 231 PG 7 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200010 ER PT J AU Watson, AM TI A lossy method for compressing raw CCD images SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE techniques : image processing ID NOISE AB This paper describes a lossy method for compressing raw images produced by CCDs or similar devices. The method is very simple: lossy quantization followed by lossless compression using general-purpose compression tools such as gzip and bzip2. A key feature of the method is that compressed images can be converted to FITS files simply by decompressing with gunzip or bunzip2, and this is a significant advantage for distributing compressed files. The degree of quantization is chosen to eliminate low-order bits that over-sample the noise, contain no information, and are difficult or impossible to compress. The method is lossy but gives guarantees on the maximum absolute difference, the expected mean difference, and the expected RMS difference between the compressed and original images; these guarantees make it suitable for use on raw images. The method consistently compresses images to roughly 1/5 of their original size with a quantization such that no value changes by more than 1/2 of a standard deviation in the background. This is a dramatic improvement on lossless compression. It appears that bzip2 compresses the quantized images to within a few tens of percent of the theoretical limit. C1 UNAM, Inst Astron, Morelia 58089, Michoacan, Mexico. RP Watson, AM, UNAM, Inst Astron, Apdo Postal 3-72,Campus Morelia, Morelia 58089, Michoacan, Mexico. CR BECKETT MG, 1998, P SOC PHOTO-OPT 1-2, V3354, P431 GAILLY JL, 1993, GZIP DATA COMPRESSIO GAZTANAGA E, 2001, MON NOT R ASTRON SOC, V320, P12 HUFFMAN DA, 1952, P IRE, V40, P1098 LOUYS M, 1999, ASTRON ASTROPHYS SUP, V136, P579 NIETOSANTISTEBA.MA, 1999, ASTRONOMICAL DATA AN, V8, P137 OBERHUMER MFX, 1998, LZOP COMPRESS EXPAND PRESS WH, 1992, ASTRONOMICAL DATA AN, V1, P3 PRESS WH, 1992, NUMERICAL RECIPES C RICE RF, 1993, P 9 AIAA COMP AER C ROMEO A, 1999, INT J MOD PHYS C, V10, P687 SEWARD JR, 1998, BZIP2 LIBBZIP2 PROGR SHANNON CE, 1948, BELL SYST TECH J, V27, P379 SHANNON CE, 1948, BELL SYST TECH J, V27, P623 SHANNON CE, 1949, P IRE, V37, P10 VEILLET C, 1998, FHT INFORMATION B, P39 VERAN JP, 1994, ASTRONOMICAL DATA AN, V3, P519 WELLS DC, 1981, ASTRON ASTROPHYS S, V44, P363 WHITE RL, ASTRONOMICAL DATA AN, V8, P125 WHITE RL, 1992, P NASA SPAC EARTH SC WHITE RL, 1998, ON BOARD COMPRESSION WHITTEN IH, 1987, COMMUN ACM, V30, P520 NR 22 TC 1 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 233 EP 249 PG 17 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200011 ER PT J AU Raga, AC Velazquez, PF Canto, J Masciadri, E TI Interpreting the proper motions of the HH 34S bowshock SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE hydrodynamics; ISM : individual (HH 34); ISM : jets and outflows; stars : pre-mainsequence ID HERBIG-HARO OBJECTS; BOW SHOCKS; HH-111 JET; HH-34; KINEMATICS; EVOLUTION; COMPLEX AB Reipurth et al. (2002) have obtained very detailed proper motions of the HH 34S bowshock using Hubble Space Telescope (HST) images. We find that these proper motions can be used to reconstruct the position-dependent shock velocity and the flow velocity ahead of the bowshock. From this excercise, we obtain shock velocities in the 60 to 120 km s(-1) range, in qualitative agreement with previous determinations based on the analysis of line profiles and line ratios. We also deduce the presence of a approximate to 200 km s(-1) flow directly ahead of HH 34S, extending out to similar to 10" on each side of the outflow axis. We interpret this flow as the wake left behind by previous outflow events, and show that a variable ejection velocity gasdynamic jet simulation does reproduce the properties of this flow in a convincing way. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. RP Raga, AC, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apdo Postal 70-543, Mexico City 04510, DF, Mexico. CR BALLY J, 1994, APJ, V428, L65 BUHRKE T, 1988, ASTRON ASTROPHYS, V200, P99 CURIEL S, 1997, ASTRON J, V114, P2736 DEVINE D, 1997, ASTRON J, V114, P2095 EISLOFFEL J, 1992, ASTRON ASTROPHYS, V263, P292 HARTIGAN P, 1987, ASTROPHYS J, V316, P323 HARTIGAN P, 2001, ASTROPHYS J 2, V559, L157 HEATHCOTE S, 1992, ASTRON J, V104, P2193 MORSE JA, 1992, ASTROPHYS J 1, V399, P231 RAGA AC, 1987, ASTROPHYS J, V323, P193 RAGA AC, 1988, AJ, V116, P2943 RAGA AC, 1990, ASTROPHYS J, V364, P601 RAGA AC, 1996, REV MEX ASTRON ASTR, V32, P161 RAGA AC, 1997, REV MEX ASTRON ASTR, V33, P157 RAGA AC, 2000, REV MEX ASTRON ASTR, V36, P67 RAYMOND JC, 1979, AP J SUPPL, V39, P1 REIPURTH B, 1986, ASTRON ASTROPHYS, V164, P51 REIPURTH B, 1992, ASTRON ASTROPHYS, V257, P693 REIPURTH B, 2002, ASTRON J, V123, P362 RIERA A, 2001, REV MEX ASTRON ASTR, V37, P147 VANLEER B, 1982, 8230 ICASE NR 21 TC 1 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 251 EP 257 PG 7 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200012 ER PT J AU Rodriguez, LF Gomez, Y Lopez, JA TI Time variation in the radio continuum emission associated with the surroundings of the nucleus of the planetary nebula KjPn 8 SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE ISM : radio sources; planetary nebulae : individual (KjPn 8) radio continuum : ISM ID MOLECULAR DISK; BIPOLAR; JETS AB We present new, high sensitivity, Very Large Array (VLA) continuum observations of the core of KjPn 8 made with arcsecond angular resolution. These observations were compared with similar observations taken 5.5 years earlier, in order to search for variations that seemed to be present in previous observations. Our comparison indicates that the emission associated with the surroundings of the stellar nucleus decreased by 40% over this period. We tentatively attribute this decrease to variations in the ejection of gas from the central star. C1 UNAM, Inst Astron, Morelia 58090, Michoacan, Mexico. UNAM, Inst Astron, Ensenada 22860, Baja California, Mexico. RP Rodriguez, LF, UNAM, Inst Astron, Campus Morelia,Apdo Postal 3-72, Morelia 58090, Michoacan, Mexico. CR FORVEILLE T, 1998, ASTROPHYS J 2, V495, L111 HUGGINS PJ, 1997, ASTROPHYS J 2, V483, L57 LOPEZ JA, 1995, APJ, V455, L63 LOPEZ JA, 1997, ASTROPHYS J 1, V475, P705 LOPEZ JA, 1999, ASTROPHYS J 1, V518, P778 LOPEZ JA, 2000, ASTROPHYS J 1, V538, P233 MEABURN J, 1997, MNRAS, V292, P11 MIRANDA LF, 1998, ASTROPHYS J 1, V496, P274 RODRIGUEZ LF, 2000, REV MEX ASTRON ASTR, V36, P51 STEFFEN W, 1998, ASTROPHYS J 1, V508, P696 VAZQUEZ R, 1998, MON NOT R ASTRON SOC, V296, P564 NR 11 TC 0 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 275 EP 278 PG 4 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200014 ER PT J AU Binette, L Gonzalez-Gomez, DI Mayya, YD TI Density gradients and internal dust in the Orion nebula SO REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA LA English DT Article DE ISM : dust; ISM : individual : orion nebula; ISM : HII regions; line : formation ID H-II-REGIONS; TEMPERATURE-FLUCTUATIONS; PHOTOIONIZED NEBULAE; PLANETARY-NEBULAE; HII-REGIONS; EVOLUTION; MODELS; STARS; PHOTOEVAPORATION; ATMOSPHERES AB The ionization structure of the Orion nebula can be described as a thin ionized skin on the surface of a dense cloud. We propose that a steep density stratification, described by a power law (n alpha x(-2), where x is the distance from the ionization front), exhibits properties which agree with our long-slit spectrum of the Orion nebula. For instance, there exists a unicity relation between both the Hbeta surface brightness or the ionization front [S II] density, and the scale L of the power law, where L is the distance between the ionization front and the onset of the density near the exciting star. Internal dust is required to obtain a simultaneously acceptable fit to both the [S II] density and the H surface brightness observations. Nebular models containing small dust grains provide a better fit than large grains. The line ratio gradients observed along the slit are qualitatively reproduced by our density stratified models, assuming a stellar temperature of 38,000 K. Collisional deexcitation appears to be responsible for half of the gradient observed in the [N II] lambda 5755/[N II] lambda 6583 temperature sensitive ratio. We propose that the empirical relationship found by Wen & O'Dell (1995) between density and stellar distance may possibly be due to a power-law density stratification. C1 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico. Inst Nacl Astrofis Opt & Elect, Puebla 7200, Mexico. RP Binette, L, Univ Nacl Autonoma Mexico, Inst Astron, Apdo Postal 70-264, Mexico City 04510, DF, Mexico. CR BALDWIN JA, 1991, ASTROPHYS J 1, V374, P580 BERTOLDI F, 1996, ASTROPHYS J 1, V458, P222 BINETTE L, 1990, ASTRON J, V100, P1046 BINETTE L, 1993, ASTROPHYS J, V414, P535 BINETTE L, 2000, REV MEX ASTRON ASTR, V36, P43 DOPITA MA, 1974, ASTROPHYS SPACE SCI, V28, P61 ESTEBAN C, 1998, MON NOT R ASTRON SOC, V295, P401 FRANCO J, 1989, REV MEX ASTRON ASTR, V18, P65 FRANCO J, 1990, ASTROPHYS J 1, V349, P126 FRANCO J, 2000, APJ, V542, P143 FRANCO J, 2000, ASTROPHYS J 1, V544, P277 GONZALEZGOMEZ DI, 1999, THESIS U AUTONOMA PU HESTER JJ, 1996, ASTRON J, V111, P2349 HILLIER DJ, 1998, ASTROPHYS J 1, V496, P407 HUBENY I, 1995, ASTROPHYS J 1, V439, P875 HUMMER DG, 1970, MON NOT R ASTRON SOC, V147, P339 KINGDON JB, 1995, ASTROPHYS J 1, V450, P691 KINGDON JB, 1998, ASTROPHYS J 1, V506, P323 MAGRIS G, 1993, ASTROPHYS SPACE SCI, V205, P141 MARTIN PG, 1991, 1 BERK C EXTR ULTR A, P341 MUNCH G, 1958, REV MOD PHYS, V30, P1035 ODELL CR, 1994, ASTROPHYS SPACE SCI, V216, P267 PAULDRACH AWA, 2001, ASTRON ASTROPHYS, V375, P161 PEIMBERT M, 1967, APJ, V150, P825 PEIMBERT M, 1995, ANAL EMISSION LINES, P165 PEREZ E, 1997, MON NOT R ASTRON SOC, V290, P465 RICHLING S, 2000, ASTROPHYS J 1, V539, P258 SANKRIT R, 2000, ASTROPHYS J 1, V535, P847 SCHAERER D, 1997, ASTRON ASTROPHYS, V322, P598 SHIELDS GA, 1978, ASTROPHYS J, V222, P821 STASINSKA G, 2001, ASTRON ASTROPHYS, V379, P1024 WEN Z, 1995, ASTROPHYS J 1, V438, P784 WURM K, 1961, Z ASTROPHYS, V52, P149 YORKE HW, 1986, ANNU REV ASTRON ASTR, V24, P49 NR 34 TC 1 PU UNIV NACIONAL AUTONOMA MEXICO, INST DE ASTRONOMIA PI MEXICO CITY PA APDO POSTAL 70-264, MEXICO CITY 04510, MEXICO SN 0185-1101 J9 REV MEX ASTRON ASTROFIS JI Rev. Mex. Astron. Astrofis. PD OCT PY 2002 VL 38 IS 2 BP 279 EP 288 PG 10 SC Astronomy & Astrophysics GA 616WK UT ISI:000179326200015 ER PT J AU Munoz-Gutierrez, M Blache, D Martin, GB Scaramuzzi, RJ TI Folliculogenesis and ovarian expression of mRNA encoding aromatase in anoestrous sheep after 5 days of glucose or glucosamine infusion or supplementary lupin feeding SO REPRODUCTION LA English DT Article ID GROWTH-FACTOR-ALPHA; DIET-INDUCED OBESITY; RAT GRANULOSA-CELLS; OVULATION RATE; LEPTIN RESISTANCE; ESTROUS-CYCLE; OVARIECTOMIZED EWES; FOLLICULAR DYNAMICS; OXYTOCIN RECEPTOR; STEROID SECRETION AB Improved nutrition increases ovulation rate in sheep and there is evidence that intra-ovarian pathways mediate responses to nutrition. An experiment was conducted to examine the effect of dietary energy on folliculogenesis. Anoestrous Merino ewes were fed a diet of wheat straw alone (control, n = 5), or wheat straw supplemented with lupins (500 g day(-1), n = 5). Other ewes were fed wheat straw and infused with glucose (50 mmol h(-1), n = 5) or with glucosamine (3.5 mmol h(-1), n = 5). Intravaginal progestagen sponges were inserted for 12 days, and nutritional treatments were started 5 days before sponge removal. At sponge removal, the ewes were injected with a regimen of GnRH pulses (500 ng every 4 h from 0 to 12 h; 250 ng every 2 h from 14 to 24 h; and 200 ng every I h from 25 to 36 h) to simulate normal follicular development. Thirty-six hours after sponge removal, the animals were killed and the ovaries were collected and stored at -80degreesC. The ovaries were sectioned serially every 10 pm. Every 20th section was stained (to estimate number and diameter of follicles) and every 17-19th section was probed by in situ hybridization for P-450 aromatase. Data were analysed using ANOVA and chi-squared tests. There was an effect of treatment (P < 0.05) on the number of follicles 2-3, 3-4 and 6-7 mm in diameter. Aromatase-positive follicles (1.6-7.9 mm) were detected in 31 follicles from 15 ewes across all four groups. In ten animals, the largest follicle was aromatase-positive. The diameters of aromatase-positive follicles were larger (P = 0.004) in lupin fed compared with glucose-infused ewes (4.9 +/- 0.5, 3.6 +/- 0.7, 5.3 +/- 0.5 and 4.2 +/- 0.5 mm for control, glucose-infused, lupin-fed and glucosamine-infused groups, respectively). Treatment did not affect the plasma concentration of FSH when compared with controls, indicating that the energy supplements were modifying recruited (2-3 mm and 3-4 mm) and selected follicles (> 6 mm) directly. In conclusion, dietary energy can directly stimulate folliculogenesis in recruited and selected follicles, and this effect may be mediated by changes in systemic leptin concentrations and the hexosamine energy-sensing pathway in the follicle. C1 Univ London Royal Vet Coll, Dept Vet Basic Sci, London NW1 0TU, England. Univ Western Australia, Dept Anim Sci & Prod, Nedlands, WA 6000, Australia. Univ Autonoma Metropolitana Iztapalapa, Dept Reprod Biol, Mexico City 09340, DF, Mexico. RP Munoz-Gutierrez, M, Univ London Royal Vet Coll, Dept Vet Basic Sci, Royal Coll St, London NW1 0TU, England. 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Embryos were divided into three groups and were inoculated in the chorioallantoic sac with 0.2 mL of UNAM97, Mass 41 IBV (positive control), or sterile PBS (negative control). Forty-eight hours later the allatoic fluid was taken and used to start a cycle of eight passages through 9d-old embryos. Seven days after the last passage, embryos were harvested and macroscopic lesions in all organs were recorded. Proventriculus and gizzard samples were obtained from all embryos and routinely processed for microscopic and ultrastructural examinations. The UNAM-97 IBV variant strain caused two macroscopic lesions uncommon for Mexican strains: thin-walled proventriculus and gizzard, as well as urate accumulation within an extra-embryonic peritoneal sac, leaving the body through the umbilical duct and accompanied by the yolk sac. At microscopic level, two relevant findings were observed to be produced by this variant. In the proventriculus, there was a decrease in the gland papillary branching, while the, gizzard showed a significant reduction in mucosa thickness and tubular-to-proliferative-cell ratio, as well as an absence of hyaline secretion in the lumen. Electrodense material scattered in proventricular and gizzard cells was observed, with a structure consistent with that of coronaviruses. These pathological chicken embryo findings have not been reported as being caused by other IBV strains in Mexico. C1 Univ Nacl Autonoma Mexico, Dept Anim Prod, Fac Med Vet & Zootecn, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Dept Biol Celular & Tisular, Fac Med, Mexico City 04510, DF, Mexico. RP Escorcia, M, Univ Nacl Autonoma Mexico, Dept Anim Prod, Fac Med Vet & Zootecn, Ciudad Univ, Mexico City 04510, DF, Mexico. CR ALLEN TC, 1995, LAB METHODS HISTOTEC, P53 CAMACHO E, 2000, P 12 CURS ACT AV AS CARGILL P, 1998, WORLD POULTRY, V14, P52 CASAUBON MT, 1997, 11 INT C WORLD VET P, P18 CAVANAGH D, 1997, DIS POULTRY, P511 COOK J, 1996, WORLD POULT, V12, P78 DELRIO JC, 1999, P 7 C SOC MEX PAT VE, P18 ESCORCIA M, 1998, P 3 C NAC VAC COL NA, P60 ESCORCIA M, 1999, THESIS U NACL AUTONO ESCORCIA M, 2000, AVIAN DIS, V44, P944 GARCIA GJM, 2001, P 13 CURS AV RESP PA, P45 GAY M, 2000, P 12 CURS ACT AV AS GELB J, 1998, LAB MANUAL ISOLATION, P169 GOODWIN MA, 1996, AVIAN PATHOL, V25, P369 GOUGH RE, 1992, VET REC, V130, P493 KEELER CL, 1998, AVIAN DIS, V42, P275 KUSTERS JG, 1989, VIROLOGY, V169, P217 LOZANO B, 1998, P 10 CURS ACT AV SAL, P80 MAYO MA, 1998, J GEN VIROL 4, V79, P649 MUNEER MA, 1988, RES VET SCI, V45, P22 PAGE RK, 1982, AVIAN DIS, V26, P618 PETRONE VM, 1999, P 7 C SOC MEX PAT VE, P46 SONG CS, 1998, J GEN VIROL 4, V79, P719 STEINHAUER DA, 1986, J VIROL, V192, P710 ZAR JH, 1996, BIOSTAT ANAL, P615 NR 25 TC 0 PU POULTRY SCIENCE ASSOC INC PI SAVOY PA 1111 NORTH DUNLAP AVE, SAVOY, IL 61874-9604 USA SN 0032-5791 J9 POULTRY SCI JI Poult. Sci. PD NOV PY 2002 VL 81 IS 11 BP 1647 EP 1652 PG 6 SC Agriculture, Dairy & Animal Science GA 616QQ UT ISI:000179314800008 ER PT J AU Garcia-Solis, P Moncada-Alvarez, MC Martinez-Coria, H Luna, M Aramburo, C Salazar-Olivo, LA TI Glycerol-3-phosphate dehydrogenase (EC1.1.1.8) is expressed in cultured chicken embryonic adipofibroblasts and upregulated by embryonic chicken serum SO POULTRY SCIENCE LA English DT Article DE in vitro adipogenesis; chicken adipofibroblast; glycerol-3-phosphate dehydrogenase ID ADIPOCYTE PRECURSOR CELLS; ADIPOSE CONVERSION; 3T3 CELLS; ADIPOGENIC FACTORS; GROWTH; DIFFERENTIATION; FETUIN; TISSUE; PREADIPOCYTES; QUANTITATION AB Chicken embryonic adipofibroblasts (CEA) accumulate intracytoplasmic lipids when cultured in medium containing chicken serum (CS), but not in medium with fetal bovine serum(FBS). To characterize this process of lipid accumulation, we evaluated the expression of the enzyme glycerol-3-phosphate dehydrogenase (E.C.1.1.1.8) (GPDH), first in chicken tissues and then in CEA cultured under diverse conditions. GPDH activity in adipose depots from 4-wk-old broiler chickens was similar or higher than that shown by liver, the main organ for fatty acid synthesis in chickens, while skeletal muscle had the lowest levels of GPDH. In vitro, GPDH activity increased in CEA cultured in the presence of CS but not in medium with FBS, paralleling the lipid accumulation by these cells. Both lipid accumulation and GPDH activity were further increased in CEA cultured in the presence of embryonic CS. Our results show that GPDH is highly expressed in avian tissues related to lipid metabolism and therefore can be a reliable marker for avian adipogenesis, and suggest that ECS is an optimum source for the purification of avian adipogenic factors. C1 Univ Autonoma Queretaro, Ctr Cerro Campanas, Queretaro 76010, Mexico. Univ Nacl Autonoma Mexico, Ctr Neurobiol, Queretaro 76230, Mexico. Inst Potosino Invest Cient & Tecnol, Dept Mol Biol, San Luis Potosi 78231, Mexico. RP Salazar-Olivo, LA, Univ Autonoma Queretaro, Ctr Cerro Campanas, Queretaro 76010, Mexico. 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Sci. PD NOV PY 2002 VL 81 IS 11 BP 1709 EP 1713 PG 5 SC Agriculture, Dairy & Animal Science GA 616QQ UT ISI:000179314800016 ER PT J AU Rojas-Herrera, R Loyola-Vargas, VM TI Induction of a class III acidic chitinase in foliar explants of Coffea arabica L. during somatic embryogenesis and wounding SO PLANT SCIENCE LA English DT Article DE Coffea arabica; coffee; chitinases; gene expression; somatic embryogenesis ID DAUCUS-CAROTA L; CULTURED RICE CELLS; ARABINOGALACTAN PROTEINS; PLANT EMBRYOGENESIS; DIFFERENTIAL DISPLAY; EMBRYO MUTANT; LEAF EXPLANTS; VARIANT TS11; CARROT; EXPRESSION AB A gene fragment. termed AR-52, was cloned by differential display analysis during the induction of somatic embryogenesis in foliar explants of Coffea arabica. It is homologous to several class III chitinases and Northern blot shows that it is up regulated during somatic embryogenesis and scarcely expressed in embryos at any developmental stage. AR-52 is also induced by wounding the leaves of in vitro cultured plantlets but not induced in a non-embryogenic suspension culture. Chitinase zymography revealed the existence of at least three-chitinolitic bands that are also regulated during somatic embryogenesis and wounding. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved. C1 Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plantas, Merida 97200, Yucatan, Mexico. RP Loyola-Vargas, VM, Ctr Invest Cient Yucatan, Unidad Bioquim & Biol Mol Plantas, Calle 43 130,Col Chuburna Hidalgo, Merida 97200, Yucatan, Mexico. 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PD OCT PY 2002 VL 163 IS 4 BP 705 EP 711 PG 7 SC Biochemistry & Molecular Biology; Plant Sciences GA 616NY UT ISI:000179310900006 ER PT J AU Adloff, C Andreev, V Andrieu, B Anthonis, T Astvatsatourov, A Babaev, A Bahr, J Baranov, P Barrelet, E Bartel, W Baumgartner, S Becker, J Beckingham, M Beglarian, A Behnke, O Belousov, A Berger, C Berndt, T Bizot, JC Bohme, J Boudry, V Braunschweig, W Brisson, V Broker, HB Brown, DP Bruncko, D Busser, FW Bunyatyan, A Burrage, A Buschhorn, G Bystritskaya, L Campbell, AJ Caron, S Cassol-Brunner, F Clarke, D Collard, C Contreras, JG Coppens, YR Coughlan, JA Cousinou, MC Cox, BE Cozzika, G Cvach, J Dainton, JB Dau, WD Daum, K Davidsson, M Delcourt, B Delerue, N Demirchyan, R De Roeck, A De Wolf, EA Diaconu, C Dingfelder, J Dixon, P Dodonov, V Dowell, JD Droutskoi, A Dubak, A Duprel, C Eckerlin, G Eckstein, D Efremenko, V Egli, S Eichler, R Eisele, F Eisenhandler, E Ellerbrock, M Elsen, E Erdmann, M Ermann, W Faulkner, PJW Favart, L Fedotov, A Felst, R Ferencei, J Ferron, S Fleischer, M Fleischmann, P Fleming, YH Flugge, G Fomenko, A Foresti, I Formanek, J Franke, G Frising, G Gabathuler, E Gabathuler, K Garvey, J Gassner, J Gayler, J Gerhards, R Gerlich, C Ghazaryan, S Goerlich, L Gogitidze, N Grab, C Grabski, V Grassler, H Greenshaw, T Grindhammer, G Hadig, T Haidt, D Hajduk, L Haller, J Heinemann, B Heinzelmann, G Henderson, RCW Hengstmann, S Henshel, H Heremans, R Herrera, G Herynek, I Hildebrandt, M Hilgers, M Hiller, KH Hladky, J Hoting, P Hoffmann, D Horisberger, R Hovhannisyan, A Hurling, S Ibbotson, M Issever, C Jacquet, M Jaffre, M Janauschek, L Janssen, X Jemanov, V Jonsson, L Johnson, C Johnson, DP Jones, MAS Jung, H Kant, D Kapichine, M Karlsson, M Karschnick, O Katzy, J Keil, F Keller, N Kennedy, J Kenyon, IR Kiesling, C Kjellberg, P Klein, M Kleinwort, C Kluge, T Knies, G Koblitz, B Koya, SD Korbel, V Kostka, P Kotelnikov, SK Koutouev, R Koutov, A Kroseberg, J Kruger, K Kuhr, T Lamb, D Landon, MPJ Lange, W Lastovicka, T Laycock, P Lebailly, E Lebedev, A Leissner, B Lemrani, R Lendermann, V Levonian, S List, B Lobodzinska, E Lobodzinski, B Loginov, A Loktionova, N Lubimov, V Luders, S Luke, D Lytkin, L Malden, N Malinovski, E Mangano, S Maracek, R Marage, P Marks, J Marshall, R Martyn, HU Martyniak, J Maxfield, SJ Meer, D Mehta, A Meier, K Meyer, AB Meyer, H Meyer, J Michine, S Mikocki, S Milstead, D Mohrdieck, S Mondragon, MN Moreau, F Morozov, A Morris, JV Muller, K Murin, P Nagovizin, V Naroska, B Naumann, J Naumann, T Newmann, PR Niebergall, F Niebuhr, C Nix, O Nowak, G Nozicka, M Olivier, B Olsson, JE Ozerov, D Panassik, V Pascaud, C Patel, GD Peez, M Perez, E Petrukhin, A Phillips, JP Pitzl, D Poschl, R Potachnikova, I Povh, B Rauschenberger, J Reimer, P Reisert, B Risler, C Rizvi, E Robmann, P Roosen, R Rostovtsev, A Rusakov, S Rybicki, K Sankey, DPC Schatzel, S Scheins, J Schilling, FP Schleper, P Schmidt, D Schmidt, D Schmidt, S Schmitt, S Schneider, M Schoeffel, L Schoning, A Tschorner, T Schroder, V Schultz-Coulon, HC Schwanenberger, C Sedlak, K Sefkow, F Shekelyan, V Sheviakov, I Shtarkov, LN Sirois, Y Sloan, T Smirnov, P Soloviev, Y South, D Spaskov, V Specka, A Spitzer, H Stamen, R Stella, B Stiewe, J Strauch, I Straumann, U Tchetchelnitski, S Thompson, G Thompson, PD Tomasz, F Traynor, D Truol, P Tsipolitis, G Tsurin, I Turnau, J Turney, JE Tzamariudaki, E Uraev, A Urban, M Usik, A Valkar, S Valkarova, A Vallee, C Van Mechelen, P Trevino, AV Vassiliev, S Vazdik, Y Veelken, C Vest, A Vichnevski, A Wacker, K Wagner, J Wallny, R Waugh, B Weber, G Wegener, D Werner, C Werner, N Wessels, M White, G Weisand, S Wilksen, T Winde, M Winter, GG Wissing, C Wobisch, M Woehrling, EE Wunsch, E Wyatt, AC Zacek, J Zalesak, J Zhang, Z Zhokin, A Zomer, F CA H1 Collaboration TI Search for excited electrons at HERA SO PHYSICS LETTERS B LA English DT Article ID LIQUID ARGON CALORIMETER; DEEP-INELASTIC-SCATTERING; LEPTON PRODUCTION; FERMIONS; CALIBRATION; COMPOSITE; COLLIDERS; GENERATOR; PHYSICS AB A search for excited electron (e*) production is described in which the electroweak decays e* --> egamma, e* --> eZ and e* ---> nuW are considered. The data used correspond to an integrated luminosity of 120 pb(-1) taken in e(+/-)p collisions from 1994 to 2000 with the H1 detector at HERA at centre-of-mass energies of 300 and 318 GeV. No evidence for a signal is found. Mass dependent exclusion limits are derived for the ratio of the couplings to the compositeness scale, f/A. These limits extend the excluded region to higher masses than has been possible in previous direct searches for excited electrons. (C) 2002 Published by Elsevier Science B.V. C1 Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany. Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany. Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England. ULB, VUB, Inter Univ Inst High Energies, Brussels, Belgium. Univ Antwerp, UIA, B-2020 Antwerp, Belgium. Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. Inst Nucl Phys, Krakow, Poland. Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany. Dubna Joint Nucl Res Inst, Dubna 141980, Russia. CEA, CE Saclay, DSM, DAPNIA, Gif Sur Yvette, France. DESY, D-2000 Hamburg, Germany. Univ Hamburg, Inst Phys Expt, Hamburg, Germany. Max Planck Inst Kernphys, D-69117 Heidelberg, Germany. Univ Heidelberg, Inst Phys, D-6900 Heidelberg, Germany. Univ Heidelberg, Kirchhoff Inst Phys, D-6900 Heidelberg, Germany. Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany. Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia. Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YW, England. Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England. Univ London Queen Mary & Westfield Coll, London E1 4NS, England. Lund Univ, Dept Phys, S-22100 Lund, Sweden. Univ Manchester, Dept Phys, Manchester M13 9PL, Lancs, England. Univ Mediterranee, CNRS, CPPM, IN2P3, Marseille, France. Inst Theoret & Expt Phys, Moscow 117259, Russia. PN Lebedev Phys Inst, Moscow 117924, Russia. Rhein Westfal TH Aachen, Inst Phys 1, D-5100 Aachen, Germany. Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany. Univ Paris 11, CNRS, IN2P3, LAL, Orsay, France. Ecole Polytech, CNRS, LPNHE, IN2P3, F-91128 Palaiseau, France. Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France. Univ Paris 08, CNRS, IN2P3, LPNHE, Paris, France. Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic. Charles Univ, Fac Math & Phys, CR-11636 Prague 1, Czech Republic. Univ Roma Tre, Dipartimento Fis, Rome, Italy. INFN Roma 3, Rome, Italy. Paul Scherrer Inst, Villigen, Switzerland. Yerevan Phys Inst, Yerevan 375036, Armenia. DESY, Zeuthen, Germany. Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland. Univ Zurich, Inst Phys, CH-8006 Zurich, Switzerland. Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece. Berg Univ Gesamthsch Wuppertal, Rechenzentrum, D-42097 Wuppertal, Germany. Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany. CINVESTAV, Dept Fis Aplicada, Merida, Yucatan, Mexico. Safarik Univ, Kosice, Slovakia. CERN, CH-1211 Geneva 23, Switzerland. CINVESTAV, Dept Fis, Mexico City 14000, DF, Mexico. RP Adloff, C, Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany. CR ABBIENDI G, UNPUB PHYS LETT B ABREU P, 1999, EUR PHYS J C, V8, P41 ABT I, 1997, NUCL INSTRUM METH A, V386, P310 ABT I, 1997, NUCL INSTRUM METH A, V386, P348 ADLOFF C, 1997, NUCL PHYS B, V497, P3 ADLOFF C, 2000, EUR PHYS J C, V17, P567 ADLOFF C, 2001, PHYS LETT B, V515, P17 AID S, 1996, NUCL PHYS B, V470, P3 ANDERSSON B, 1989, Z PHYS C PART FIELDS, V43, P625 ANDRIEU B, 1993, NUCL INSTRUM METH A, V336, P460 ANDRIEU B, 1993, NUCL INSTRUM METH A, V336, P499 ANDRIEU B, 1994, NUCL INSTRUM METH A, V350, P57 BARANOV SP, 1991, P PHYS HERA, V3, P1478 BARNETT RM, 1996, PHYS REV D 1, V54, P1 BATE P, 1999, THESIS U MANCHESTER BAUR U, 1990, PHYS REV D, V42, P815 BERGER C, 1998, P WORKSH MONT CARL G, P596 BOUDJEMA F, 1993, Z PHYS C PART FIELDS, V57, P425 CARLI T, 1998, P WORKSH MONT CARL G, P185 CHEKANOV S, DESY01132 DELERUE N, 2002, THESIS U MEDITERRANE DERRICK M, 1996, Z PHYS C PART FIELDS, V69, P607 DERRICK M, 1996, Z PHYS C PART FIELDS, V72, P399 HAGIWARA K, 1985, Z PHYS C PART FIELDS, V29, P115 HARARI H, 1984, PHYS REP, V104, P159 HELENE O, 1984, NUCL INSTRUM METH A, V228, P120 JUNG H, 1995, COMPUT PHYS COMMUN, V86, P147 KOHLER T, 1991, P PHYS HERA, V3, P1526 KWIATKOWSKI A, 1992, COMPUT PHYS COMMUN, V69, P155 LONNBLAD L, 1992, COMPUT PHYS COMMUN, V71, P15 MARTIN AD, 1998, EUR PHYS J C, V4, P463 SCHONING A, 1996, THESIS U HAMBURG SCHULER GS, 1991, OCT P WORKSH PHYS HE, V3, P1419 SJOSTRAND T, 1994, COMPUT PHYS COMMUN, V82, P74 SJOSTRAND T, 1995, HEPPH9508391 NR 35 TC 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 14 PY 2002 VL 548 IS 1-2 BP 35 EP 44 PG 10 SC Physics, Multidisciplinary GA 615RE UT ISI:000179259800007 ER PT J AU Capovilla, R Guven, J TI Geometry of lipid vesicle adhesion SO PHYSICAL REVIEW E LA English DT Article ID MEMBRANES; ENERGY; SHAPE; MECHANICS AB The adhesion of a lipid membrane vesicle to a fixed substrate is examined from a geometrical point of view. This vesicle is described by the Helfrich Hamiltonian quadratic in the mean curvature; it interacts by contact with the substrate, with an interaction energy proportional to the area of contact. We identify the constraints on the geometry at the boundary of the shared surface. The result is interpreted in terms of the balance of the force normal to this boundary. No assumptions are made either on the symmetry of the vesicle or on that of the substrate. The strong bonding limit as well as the effect of curvature asymmetry on the boundary are discussed. C1 Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Mexico City 07000, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RP Capovilla, R, Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Apartado Postal 14-740, Mexico City 07000, DF, Mexico. CR BLOKHUIS EM, 1999, J CHEM PHYS, V110, P3148 BLOKHUIS EM, 1999, J CHEM PHYS, V111, P7062 BOAL D, 2002, MECH CELL BOWICK MJ, 2001, PHYS REP, V344, P255 CANHAM PB, 1970, J THEOR BIOL, V26, P61 CAPOVILLA R, 2002, J PHYS A-MATH GEN, V35, P6233 CAPOVILLA R, 2002, PHYS REV E, V66 EVANS E, 1995, HDB BIOL PHYSICS, V1 EVANS EA, 1974, BIOPHYS J, V14, P923 EVANS EA, 1985, BIOPHYS J, V48, P175 FARHI E, 1990, NUCL PHYS B, V339, P417 GOETZ R, 1996, J PHYS II, V6, P215 HELFRICH W, 1973, Z NATURFORSCH C, V28, P693 HELFRICH W, 1995, HDB BIOL PHYSICS, V1 KRAUS M, 1995, EUROPHYS LETT, V32, P431 LIPOWSKY R, 1995, HDB BIOL PHYSICS, V1 LIPOWSKY R, 1995, HDB BIOL PHYSICS, V2 NELSON D, 1989, P JER WINT SCH THEOR, V5 PELITI L, 1996, FLUCTUATING GEOMETRI ROSSO R, 1998, CONTINUUM MECH THERM, V10, P359 SEIFERT U, 1990, PHYS REV A, V42, P4768 SEIFERT U, 1991, PHYS REV A, V43, P6803 SEIFERT U, 1995, HDB BIOL PHYSICS, V1 SERVUSS RM, 1989, J PHYS-PARIS, V50, P809 SVETINA S, 1989, EUR BIOPHYS J, V17, P101 SWAIN PS, 2001, PHYS REV E 1, V63 TORDEUX C, 2002, PHYS REV E 1, V65 NR 27 TC 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 1 AR 041604 DI ARTN 041604 PG 6 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EV UT ISI:000179176100052 ER PT J AU Baldovin, F Robledo, A TI Universal renormalization-group dynamics at the onset of chaos in logistic maps and nonextensive statistical mechanics SO PHYSICAL REVIEW E LA English DT Article ID POWER-LAW SENSITIVITY; DISSIPATIVE SYSTEMS; INITIAL CONDITIONS; QUASI-PERIODICITY; FRACTALITY AB We uncover the dynamics at the chaos threshold mu(infinity) of the logistic map and find that it consists of trajectories made of intertwined power laws that reproduce the entire period-doubling cascade that occurs for mu<μ(&INFIN;). We corroborate this structure analytically via the Feigenbaum renormalization-group (RG) transformation and find that the sensitivity to initial conditions has precisely the form of a q exponential, of which we determine the q index and the q-generalized Lyapunov coefficient λ(q). Our results are an unequivocal validation of the applicability of the nonextensive generalization of Boltzmann-Gibbs statistical mechanics to critical points of nonlinear maps. C1 Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. RP Baldovin, F, Ctr Brasileiro Pesquisas Fis, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, Brazil. CR ANANIA G, 1988, EUROPHYS LETT, V7, P119 BALDOVIN F, CONDMAT0203595 BALDOVIN F, IN PRESS EUROPHYS LE BUIATTI M, 1999, PHYS REV LETT, V82, P3383 CHRISTIANSEN F, 1990, J PHYS A-MATH GEN, V23, L713 COSTA UMS, 1997, PHYS REV E A, V56, P245 DEMOURA FABF, 2000, PHYS REV E A, V62, P6361 FEIGENBAUM MJ, 1982, PHYSICA D, V5, P370 GRASSBERGER P, 1981, J STAT PHYS, V26, P697 HATA H, 1989, PROG THEOR PHYS, V82, P897 HU B, 1982, PHYS REV LETT, V48, P1645 IGNACCOLO M, CONDMAT0004151 KUZNETSOV AP, 1997, PHYSICA D, V109, P91 LYRA ML, 1998, PHYS REV LETT, V80, P53 MACKAY RS, 1988, NONLINEARITY, V1, P253 ROBLEDO A, IN PRESS PHYSICA A SCHNEIDER T, 1987, Z PHYS B CON MAT, V66, P469 SCHUSTER HG, 1988, DETERMINISTIC CHAOS TSALLIS C, 1988, J STAT PHYS, V52, P479 TSALLIS C, 1997, CHAOS SOLITON FRACT, V8, P885 TSALLIS C, 2001, LECT NOTE PHYS, V560, P3 WIDOM M, 1983, COMMUN MATH PHYS, V92, P121 NR 22 TC 41 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 045104 DI ARTN 045104 PG 4 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300004 ER PT J AU Mendez-Bermudez, JA Luna-Acosta, GA Seba, P Pichugin, KN TI Understanding quantum scattering properties in terms of purely classical dynamics: Two-dimensional open chaotic billiards SO PHYSICAL REVIEW E LA English DT Article ID BALLISTIC-TRANSPORT; POINCARE SECTIONS; CAVITIES; EIGENFUNCTIONS; LOCALIZATION; CHANNEL AB We study classical and quantum scattering properties of particles in the ballistic regime in two-dimensional chaotic billiards that are models of electron- or micro-waveguides. To this end we construct the purely classical counterparts of the scattering probability (SP) matrix \S-n,S-m\(2) and Husimi distributions specializing to the case of mixed chaotic motion (incomplete horseshoe). Comparison between classical and quantum quantities allows us to discover the purely classical dynamical origin of certain general as well as particular features that appear in the quantum description of the system. On the other hand, at certain values of energy the tunneling of the wave function into classically forbidden regions produces striking differences between the classical and quantum quantities. A potential application of this phenomenon in the field of microlasers is discussed briefly. We also see the manifestation of whispering gallery orbits as a self-similar structure in the transmission part of the classical SP matrix. C1 Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. Univ Hradec Kralove, Dept Phys, Hradec Kralove, Czech Republic. Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic. LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia. RP Mendez-Bermudez, JA, Univ Autonoma Puebla, Inst Fis, Apartado Postal J-48, Puebla 72570, Mexico. CR AKGUC GB, 2000, J STAT PHYS, V98, P813 BACKER A, 2002, ARXIVNLINCD0201057 BARANGER HU, 1991, PHYS REV B, V44, P10637 BARANGER HU, 1993, CHAOS, V3, P665 BARANGER HU, 1993, PHYS REV LETT, V70, P3876 BARANGER HU, 1995, PHYSICA D, V83, P30 BREYMANN W, 1994, EUROPHYS LETT, V25, P509 CRESPI B, 1993, PHYS REV E, V47, P986 DATTA S, 1995, ELECT TRANSPORT MESO DEMBOWSKI C, 1999, PHYS REV E A, V60, P3942 GMACHL C, 1998, SCIENCE, V280, P1556 GUTZWILLER MC, 1990, CHAOS CLASSICAL QUAN HAAKE F, 1991, QUANTUM SIGNATURES C HUCKESTEIN B, 2000, PHYS REV LETT, V84, P5504 HUSIMI K, 1940, P PHYS MATH SOC JPN, V22, P246 IMRY J, 1997, INTRO MESOSCOPIC SYS IZRAILEV FM, 1990, PHYS REP, V196, P299 KRUELLE CA, 1997, Z NATURFORSCH A, V52, P581 LICHTENBERG AJ, 1992, REGULAR CHAOTIC DYNA LIPP C, 1995, J PHYS A-MATH GEN, V28, P6887 LUNAACOSTA GA, 1996, PHYS REV B, V54, P11410 LUNAACOSTA GA, 1996, PHYS REV E A, V53, P3271 LUNAACOSTA GA, 2000, PHYS LETT A, V274, P192 LUNAACOSTA GA, 2001, PHYS REV E 2, V64 LUNAACOSTA GA, 2002, PHYS REV E 2B, V65 MENDEZBERMUDEZ JA, UNPUB MENDEZBERMUDEZ JA, 2002, PHYS STATUS SOLIDI B, V230, P385 NAZMITDINOV RG, 2001, PHYS REV E 2, V64 NOCKEL JU, 1997, NATURE, V385, P45 REICHL LE, 1992, TRANSITION CHAOS CON RUCKERL B, 1994, J PHYS A-MATH GEN, V27, P55 SMALE S, 1967, B AM MATH SOC, V73, P747 STOCKMANN HJ, 1999, QUANTUM CHAOS INTRO TENNYSON JL, 1979, AIP C P, V57, P158 NR 34 TC 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 046207 DI ARTN 046207 PG 8 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300058 ER PT J AU Reigada, R Sarmiento, A Lindenberg, K TI Asymptotic dynamics of breathers in Fermi-Pasta-Ulam chains SO PHYSICAL REVIEW E LA English DT Article ID INTRINSIC LOCALIZED MODES; NONLINEAR LATTICES; DISCRETE BREATHERS; RELAXATION; EXISTENCE; STABILITY; SYSTEMS AB We carry out a numerical study of the asymptotic dynamics of breathers in finite Fermi-Pasta-Ulam chains at zero and nonzero temperatures. While at zero temperature such breathers remain essentially stationary and decay extremely slowly over wide parameter ranges, thermal fluctuations tend to lead to breather motion and more rapid decay. In both cases the decay is essentially exponential over long time intervals. C1 Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA. Univ Calif San Diego, Inst Nonlinear Sci, La Jolla, CA 92093 USA. Univ Barcelona, Dept Quim Fis, E-08028 Barcelona, Spain. Univ Nacl Autonoma Mexico, Inst Matemat, Chamilpa 62200, Morelos, Mexico. RP Reigada, R, Univ Calif San Diego, Dept Chem & Biochem, 9500 Gilman Dr, La Jolla, CA 92093 USA. CR AUBRY S, 1997, PHYSICA D, V103, P201 BIKAKI A, 1999, PHYS REV E B, V59, P1234 FLACH S, 1995, PHYS REV E, V51, P1503 FLACH S, 1998, PHYS REP, V295, P181 FLACH S, 1999, PHYSICA D, V119, P237 HENNIG D, 1999, PHYS REP, V307, P334 KEVREKIDIS PG, 2001, INT J MOD PHYS B, V15, P2833 KIVSHAR YS, 1998, PHYS REV B, V58, P5423 KOPIDAKIS G, 2001, PHYS REV LETT, V87 MACKAY RS, 2000, PHYSICA A, V288, P174 MARIN JL, 1996, NONLINEARITY, V9, P1501 PAGE JB, 1990, PHYS REV B, V41, P7835 PEYRARD M, 2000, PHYSICA A, V288, P199 PIAZZA F, COMMUNICATION PIAZZA F, 2001, J PHYS A-MATH GEN, V34, P9803 REIGADA R, UNPUB REIGADA R, 2001, PHYS REV E 2, V64 REIGADA R, 2002, PHYSICA A, V305, P467 SANDUSKY KW, 1992, PHYS REV B, V46, P6161 SIEVERS AJ, 1988, PHYS REV LETT, V61, P970 TSIRONIS GP, 1996, PHYS REV LETT, V77, P5225 NR 21 TC 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 046607 DI ARTN 046607 PG 6 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300108 ER PT J AU Zurita-Sanchez, JR Sanchez, AS Halevi, P TI Dipole radiation in a one-dimensional photonic crystal. II. TM polarization SO PHYSICAL REVIEW E LA English DT Article ID DENSITY-OF-STATES; DIELECTRIC SUPERLATTICE; MEDIA AB As in a recent paper [I. Alvarado-Rodriguez, P. Halevi, and Adan S. Sanchez, Phys. Rev. E 63, 056613 (2001); 65, 039901(E) (2002)], we study the power emitted by an oscillating dipole in a superlattice (SL) modeled by means of a periodic distribution of Dirac-delta functions (Dirac-comb SL). However, while in the aforementioned paper the radiation was restricted to the transverse electric (TE) polarization mode, here we focus our attention on the transverse magnetic (TM) mode. Employing the same methodology, again we find that the power spectra are dominated by slope discontinuities. These occur - if at all - at the band edges for on-axis propagation, depending on the dipole's position and orientation. The largest enhancement or inhibition is present for normalized frequencies such that (omegad/c)less than or similar to2pi; here, omega is the dipole frequency, c is the speed of light in vacuum, and d is the distance between the barriers. For substantial values of the grating strength considerable enhancement or suppression of the radiated power (in comparison to the free-space value) is obtained. We also find that the power emitted by a gas of randomly oriented dipoles exhibits slope discontinuities at all band edges for on-axis propagation. In comparison with the TE polarization case, the TM polarization exhibits several different qualitative features. C1 Inst Nacl Astrofis Opt & Electr, Puebla 72000, Mexico. Weizmann Inst Sci, Dept Chem Phys, IL-76100 Rehovot, Israel. RP Zurita-Sanchez, JR, Univ Rochester, Inst Opt, Rochester, NY 14627 USA. CR ALVARADORODRIGU.I, 2001, PHYS REV E, V63 ALVARADORODRIGUEZ I, 1999, PHYS REV E B, V59, P3624 ALVARADORODRIGUEZ I, 2002, PHYS REV E 2B, V65 DOWLING JP, 1992, PHYS REV A, V46, P612 GLAUBER RJ, 1991, PHYS REV A, V43, P467 ZURITASANCHEZ JR, 2000, PHYS REV E B, V61, P5802 NR 6 TC 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 046613 DI ARTN 046613 PG 8 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300114 ER PT J AU Gongora, A Jose, JV Schaffner, S TI Classical solutions of an electron in magnetized wedge billiards SO PHYSICAL REVIEW E LA English DT Article ID PERIODIC ORBIT THEORY; QUANTUM DOTS; FLUCTUATIONS; FIELDS AB We have studied the classical solutions of a free electron constrained to move inside a circular wedge of angle theta(w), in the presence of a homogeneous constant magnetic field B. These billiards have broken rotational symmetry. As B and theta(w) are varied, the apex of the billiards affects the classical dynamics in an important way. We find that for billiards with angles (root5-1)/2less than or equal totheta(w)less than or equal topi/2, the dynamics exhibits a reentrant transition as the field increases. The transition is from regular-to-mixed-to-chaotic-to-mixed-to-chaotic regimes. The reentrance is connected to the appearance and disappearance of periodic orbits nucleated at the boundaries of these billiards as the field increases. There is no reentrance when theta(w)>pi/2. In the latter case as B increases the dynamics goes from quasiintegrable, to intermediate and then to chaotic whispering gallery Larmor modes. C1 Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Cuernavaca 62250, Morelos, Mexico. Northeastern Univ, Dept Phys, Boston, MA 02115 USA. Northeastern Univ, Ctr Interdisciplinary Res Complex Syst, Boston, MA 02115 USA. RP Gongora, A, Univ Nacl Autonoma Mexico, Ctr Ciencias Fis, Apartheid Postal 48-3, Cuernavaca 62250, Morelos, Mexico. CR BERGLUND N, 1996, J STAT PHYS, V83, P81 BERRY MJ, 1994, PHYS REV B, V50, P17721 BERRY MJ, 1994, THESIS HARVARD U BLASCHKE J, 1997, PHYS REV A, V56, P182 BOGGILD P, 1998, PHYS REV B, V57, P15408 CASATI G, 1995, QUANTUM CHAOS ORDER GIANNONI MJ, 1991, CHAOS QUANTUM PHYSIC, V52 GONGORAT A, 2000, PHYS LETT A, V274, P117 GUTZWILLER MC, 1990, CHAOS CLASSICAL QUAN LICHTENBERG AJ, 1992, APPL MATH SCI, V38 MARCUS CM, 1992, PHYS REV LETT, V69, P506 MEISS JD, 1992, CHAOS, V2, P267 MILNER V, 2001, PHYS REV LETT, V86, P1514 ROBINETT RW, 1998, J MATH PHYS, V39, P278 ROBNIK M, 1985, J PHYS A-MATH GEN, V18, P1361 STOCKMAN HJ, 1999, QUANTUM CHAOS INTRO SZEREDI T, 1993, PHYS REV E, V48, P3518 NR 17 TC 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 047201 DI ARTN 047201 PG 4 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300147 ER PT J AU Parmananda, P Mena, CH Baier, G TI Resonant forcing of a silent Hodgkin-Huxley neuron SO PHYSICAL REVIEW E LA English DT Article ID PHASE-LOCKING; AXONS AB Dynamical behavior of a silent Hodgkin-Huxley neuron subjected to external periodic perturbations is investigated. Induced dynamics for this forced system, exhibit nonlinear resonance with respect to the forcing frequency. Within the U-shaped resonance curve, both regular (phase locked) and irregular spike sequences are invoked. For appropriate tuning frequencies, this simple system generates spike trains recordings similar to ones observed in actual experiments. C1 UAEM, Fac Ciencias, Cuernavaca, Morelos, Mexico. RP Parmananda, P, UAEM, Fac Ciencias, Ave Univ,1001,Colonia Chamilpa, Cuernavaca, Morelos, Mexico. CR ADRIAN ED, 1926, J PHYSIOL-LONDON, V61, P47 ADRIAN ED, 1928, BASIS SENSATION ACTI BRAUN HA, 1994, NATURE, V367, P270 FERSTER D, 1995, SCIENCE, V270, P756 GARSTNER WE, 1995, PHYS REV E, V51, P738 HASEGAWA H, 2000, PHYS REV E, V61, P718 HODGKIN AL, 1952, J PHYSIOL, V117, P500 KAPLAN DT, 1996, PHYS REV LETT, V76, P4074 KOPPL C, 1997, J NEUROSCI, V17, P3312 MAASS W, 1997, NEURAL COMPUT, V9, P279 MATSUMOTO G, 1987, PHYS LETT A, V123, P162 NODA H, 1970, BRAIN RES, V18, P513 PARMANANDA P, 2001, PHYS REV LETT, V87 SEJNOWSKI TJ, 1995, NATURE, V376, P21 THORPE S, 1996, NATURE, V381, P520 YU YG, 2001, PHYS REV E, V63, P21907 NR 16 TC 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 2002 VL 66 IS 4 PN Part 2 AR 047202 DI ARTN 047202 PG 4 SC Physics, Fluids & Plasmas; Physics, Mathematical GA 614EX UT ISI:000179176300148 ER PT J AU Uc, VH Hernandez-Laguna, A Grand, A Vivier-Bunge, A TI Isomeric adduct stability in the addition of atomic radicals to toluene: H, O(P-3), F and Cl SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article ID GAS-PHASE; ATMOSPHERIC OXIDATION; MECHANISM; OH; KINETICS; EXCHANGE; BENZENE AB In recent work we have found that, in the case of the OH addition to toluene, ipso addition may be important. Moreover, quite different values were calculated for several of the EPR coupling constants of the different adduct isomers, suggesting that electron paramagnetic resonance measurements could provide decisive information on the selectivity of the OH radical addition reaction to toluene. In this work, the reaction of the atomic radicals, H, O(P-3), F and Cl with toluene has been studied using ab initio theoretical methods to compare the stability of the isomeric adducts and to predict their expected hyperfine coupling constants. Ipso addition is found to be favored only for fluorine, although the ipso and ortho isomers have very similar energies for oxygen and chlorine. Ipso adducts are expected to contribute nonnegligibly in all cases. C1 Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico. CSIC, Estac Expt Zaidin, E-18008 Granada, Spain. CEA Grenoble, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble, France. RP Uc, VH, Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico. 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Chem. Chem. Phys. PY 2002 VL 4 IS 23 BP 5730 EP 5738 PG 9 SC Chemistry, Physical; Physics, Atomic, Molecular & Chemical GA 615GM UT ISI:000179237500004 ER PT J AU Reyes, JA Coyotecatl, HA del Castillo-Mussot, M Cocoletzi, GH TI Wannier-Mott excitons formed by electrons in a quantum wire and holes in a perpendicular quantum layer SO PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES LA English DT Article ID OPTICAL-PROPERTIES AB We analyze Wannier-Mott excitons in which the electrons are constrained in one-dimensional quantum wires and the holes in two-dimensional quantum layers perpendicular to the wires. The resulting three-dimensional exciton Schrodinger equation in the laboratory frame of reference is solved in terms of the common 3D exciton states in the center of mass frame. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. Univ Autonoma Puebla, Fac Ciencias Elect, Puebla 72570, Mexico. Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. RP Reyes, JA, Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20364, Mexico City 01000, DF, Mexico. CR BASTARD G, 1982, PHYS REV B, V26, P1974 FOMIN VM, 1985, PHYS STATUS SOLIDI B, V128, P251 GLUSHKO EY, 1983, PHYS STATUS SOLIDI B, V115, P529 GUSEINOV RR, 1983, SOV PHYS-SOLID STATE, V25, P1220 KITTEL C, 1954, PHYS REV, V96, P1488 KITTEL C, 1976, INTRO SOLID STATE PH, CH8 KOHN W, 1955, PHYS REV, V98, P915 LEFEBVRE P, 1993, J PHYS IV, V3, P377 LOKTEV VM, 1984, SOLID STATE COMMUN, V50, P933 LOZOVIK YE, 1976, FIZ TVERD TELA, V18, P3267 LOZOVIK YE, 1976, SOV PHYS-SOLID STATE, V18, P1905 MULJAROV EA, 1999, PHYS REV B, V59, P4600 OHNO N, 1984, J PHYS SOC JPN, V53, P1548 PEREIRA MF, 1990, PHYS REV B, V42, P7084 PERTZSCH B, 1980, PHYS STATUS SOLIDI B, V101, P197 RAY P, 1993, PHYS REV B, V47, P15958 REYES JA, 1998, PHYS REV B, V57, P1690 REYES JA, 1999, HELV PHYS ACTA, V72, P180 NR 18 TC 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1386-9477 J9 PHYSICA E JI Physica E PD NOV PY 2002 VL 15 IS 3 BP 124 EP 130 PG 7 SC Physics, Condensed Matter GA 617HW UT ISI:000179357100003 ER PT J AU Golberg, D Bando, Y Mitome, M Kurashima, K Sato, T Grobert, N Reyes-Reyes, M Terrones, H Terrones, M TI Preparation of aligned multi-walled BN and B/C/N nanotubular arrays and their characterization using HRTEM, EELS and energy-filtered TEM SO PHYSICA B-CONDENSED MATTER LA English DT Article DE B-C-N; BN; nanotubes; transmission electron microscopy; electron energy loss spectroscopy ID BORON-NITRIDE NANOTUBES; CARBON NANOTUBES; BXCYNZ NANOTUBES; BC2N; NANOSTRUCTURES; NANOFIBERS; STABILITY; GROWTH AB Aligned multi-walled nanotubes composed of B/C/N and/or B/N atoms were synthesized by reacting chemical-vapor-deposition-grown C nanotubes or pyrolitically grown CNx nanotubes, boron oxide and nitrogen at 1773-2200 K. We note that by increasing the reacting temperature, the overall B-N content within the tubular assemblies is also enhanced. The nanostructures were studied using high-resolution transmission electron microscopy, spatially resolved energy-filtered TEM (Omega filter) and electron energy loss spectroscopy. An oxidation-driven mechanism of B-N enrichment within the C-based tubular templates has been proposed and verified by the experimental observations. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan. IPICYT, San Luis Potosi 78210, Mexico. Univ Sussex, Fullerene Sci Ctr, CPES, Brighton BN1 9QJ, E Sussex, England. RP Bando, Y, Natl Inst Mat Sci, Adv Mat Lab, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan. CR BANDO Y, 2001, CHEM PHYS LETT, V347, P349 BANDO Y, 2001, JPN J APPL PHYS 2, V40, L1193 BLASE X, 1994, EUROPHYS LETT, V28, P335 BLASE X, 1999, APPL PHYS A-MATER, V68, P293 CHEN QD, 2001, J NANOSCI NANOTECHNO, V1, P43 CHOPRA NG, 1995, SCIENCE, V269, P966 DRESSELHAUS MS, 1996, SCI FULLERENES CARBO FAN SS, 1999, SCIENCE, V283, P512 GOLBERG D, 1999, J APPL PHYS, V86, P2364 GOLBERG D, 2000, APPL PHYS LETT, V77, P1979 GOLBERG D, 2000, CHEM PHYS LETT, V323, P185 GOLBERG D, 2000, SOLID STATE COMMUN, V116, P1 GOLBERG D, 2001, APPL PHYS LETT, V79, P415 GOLBERG D, 2002, UNPUB CHEM PHYS LETT HAN WQ, 2001, APPL PHYS LETT, V78, P2769 HARRIS PJF, 1999, CARBON NANOTUBES REL IIJIMA S, 1991, NATURE, V354, P56 JOHANSSON MP, 2000, APPL PHYS LETT, V76, P825 KAWAGUCHI M, 1997, ADV MATER, V9, P615 LI WZ, 1996, SCIENCE, V274, P1701 LOUCHEV OA, 1997, APPL PHYS LETT, V71, P3522 MIYAMOTO Y, 1994, PHYS REV B, V50, P4976 SHELIMOV KB, 2000, CHEM MATER, V12, P250 STEPHAN O, 1995, SCIENCE, V266, P966 SUENAGA K, 1997, SCIENCE, V278, P653 TERRONES M, 1997, NATURE, V388, P52 TERRONES M, 1999, APPL PHYS LETT, V75, P3932 WATANABE MO, 1996, APPL PHYS LETT, V68, P2962 WATANABE MO, 1996, PHYS REV LETT, V77, P187 WILDOER JWG, 1998, NATURE, V391, P59 YU J, 2000, APPL PHYS LETT, V77, P1949 YU J, 2001, J VAC SCI TECHNOL B, V19, P671 ZHANG Y, 1998, SCIENCE, V281, P973 NR 33 TC 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD OCT PY 2002 VL 323 IS 1-4 BP 60 EP 66 PG 7 SC Physics, Condensed Matter GA 616RT UT ISI:000179317300011 ER PT J AU Sandoval-Villalbazo, A TI A structure factor approach to the Sunyaev-Zel'dovich effect SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article DE collisionless hot plasmas; light scattering; cosmic background radiation ID COMPTONIZATION; GAS AB Structure factor theory (SFT) is applied to analyze distortions to the cosmic microwave background radiation (CMBR) due the Sunyaev-Zel'dovich Effect (SZE) in typical clusters of galaxies. It is shown that a suitable structure factor associated to a collisionless (Knudsen) gas is able to reproduce the SZE distortion of the CMBR. Physical arguments suggest that SFT yields an approximate solution to the Kompaneets equation and sets plausible values for the two "free" parameters involved in the calculation of the spectral distortion. Finally, further applications of the SFT to other standard cosmological problems are briefly discussed. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Iberoamer, Dept Ciencias, Mexico City 01210, DF, Mexico. Univ Portsmouth, Sch Comp Sci & Math, Relat & Cosmol Grp, Portsmouth PO1 2EG, Hants, England. RP Sandoval-Villalbazo, A, Univ Iberoamer, Dept Ciencias, Mexico City 01210, DF, Mexico. CR BERNE BJ, 1976, DYNAMIC LIGHT SCATTE BIRKINSHAW M, 1999, PHYS REP, V310, P97 CARLSTROM JE, 2000, IN PRESS IAP C CHALLINOR A, 1999, ASTROPHYS J 1, V510, P930 CHALLINOR AD, 1988, ASTROPHYS J, V499, P1 DIEGO JM, IN PRESS MON NOT R A DISTEFANO R, 2001, UNPUB ASTROPHYS J EGELSTAFF PA, 1967, INTRO LIQUID STATE REPHAELI Y, 1995, ASTROPHYS J 1, V445, P33 REPHAELI Y, 2001, P 9 M GROSSM M GEN R RYBICKI GB, 1979, RAD PROCESSES ASTROP SANDOVALVILLALBAZO A, 2000, PHYSICA A, V278, P428 SAZONOV SY, 1998, ASTROPHYS J 1, V508, P1 STANLEY HE, 1971, INTRO PHASE TRANSITI SUNYAEV RA, 1972, COMM ASTROPHYS SPACE, V4, P173 YIP S, 1964, PHYS REV A, V135, P1241 ZELDOVICH YB, 1969, ASTROPHYS SPACE SCI, V4, P30 NR 17 TC 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD OCT 15 PY 2002 VL 313 IS 3-4 BP 456 EP 462 PG 7 SC Physics, Multidisciplinary GA 617JF UT ISI:000179358000014 ER PT J AU Alvarez-Ramirez, J Cisneros, M Ibarra-Valdez, C Soriano, A TI Multifractal Hurst analysis of crude oil prices SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article DE crude oil prices; persistence; fluctuations; time scales ID STATISTICAL PHYSICS; AFFINE AB Daily records of international crude oil prices are studied using multitractal analysis methods. Rescaled range Hurst analysis provides evidence that the crude oil market is a persistent process with long-run memory effects. On the other hand, height-height correlation analysis reveals evidence of multifractal structures in the sense that the crude oil dynamics displays mixing of (rough) Hurst exponents. The existence of two characteristic time scales in the order of weeks and quarters is discovered and the corresponding prices dynamics are extracted using moving-average-based filtering. These results seem to demonstrate that the crude oil market is consistent with the random-walk assumption only at time scales of the order of days to weeks. A plausible oil price formation mechanism is discussed in terms of the market dynamics at three different time scales. (C) 2002 Elsevier Science B.V. All rights reserved. RP Alvarez-Ramirez, J, Corina 117-G3,Col Del Carmen, Coyoacan 04100, DF, Mexico. CR AUSLOOS M, 2000, PHYSICA A, V285, P48 BACHELIER L, 1900, ANN SCI ECOLE NORM S, V3, P21 BARABASI AL, 1991, PHYS REV A, V44, P2730 BARABASI AL, 1991, PHYSICA A, V178, P17 BLACK F, 1986, J FINANC, V41, P529 BULDYREV SV, 1998, PHYSICA A, V249, P430 CAMPBELL J, 1996, ECONOMETRICS FINANCI FEDER J, 1988, FRACTALS HURST HE, 1951, T AM SOC CIVIL ENG, V116, P770 KATSURAGI H, 1999, PHYS REV E A, V59, P254 LO AW, 1999, NONRANDOM WALK WALL MANDELBROT B, 1963, J BUS, V36, P394 MANDELBROT BB, 1997, FRACTALS SCALING FIN MANTEGNA RN, 1994, PHYS REV LETT, V73, P2946 MANTEGNA RN, 1999, INTRO ECONOPHYSICS C NORENG O, 1978, OIL POLITICS 80S PAT PETERS EE, 1996, CHAOS ORDER CAPITAL SORNETTE D, 1996, J PHYS I, V6, P167 WERON R, 2000, PHYSICA A, V283, P462 NR 19 TC 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD OCT 15 PY 2002 VL 313 IS 3-4 BP 651 EP 670 PG 20 SC Physics, Multidisciplinary GA 617JF UT ISI:000179358000028 ER PT J AU Layseca-Espinosa, E Perez-Gonzalez, LF Torres-Montes, A Baranda, L de la Fuente, H Rosenstein, Y Gonzalez-Amaro, R TI Expression of CD64 as a potential marker of neonatal sepsis SO PEDIATRIC ALLERGY AND IMMUNOLOGY LA English DT Article DE cytokines; interleukin-1; adhesion molecules; newborn; FcgRI ID TUMOR-NECROSIS-FACTOR; ADHESION MOLECULES; EARLY DIAGNOSIS; FACTOR-ALPHA; L-SELECTIN; BACTERIAL-INFECTION; NEWBORN-INFANTS; SEPTIC SHOCK; FC-RECEPTORS; INTERLEUKIN-6 AB The aim of this study was to identify a novel immunological indicator useful for the early diagnosis (through a rapid and single determination) of neonatal sepsis ( NS). Peripheral blood samples were taken from 63 neonates, who were classified into four groups: proven NS (n=17); clinical NS ( n=14); disease without infection (n=17); and healthy newborns (n=15). Neutrophil expression of CD64, CD43, CD44, CD50, CD62L and Mac-1, and plasma levels of interleukin (IL)-1beta, IL-6, tumor necrosis factor-alpha (TNF-alpha) and soluble L-selectin (sCD62L), were determined. Expression of CD64 was significantly enhanced in the group with proven sepsis and clinical NS compared to newborns without infection (p<0.05). Eight newborns with proven or clinical sepsis, but only one with disease without infection, showed an increased percentage of CD64(+) cells ( diagnostic specificity = 96.8%). No significant differences were found in the expression of the other leucocyte differentiation antigens studied. As previously described, TNF-α and IL-6 levels were significantly elevated in newborns with proven or clinical sepsis compared to neonates without infection (p<0.05). Our results suggest that, through a single determination, the enhanced expression of CD64 is a highly specific indicator of NS, although its diagnostic sensitivity is low (25.8%). In contrast, we found that plasma levels of IL-1beta and sCD62L, as well as the expression of Mac-1, CD43, CD44, CD50, and CD62L, do not appear to be useful for the diagnosis of NS. C1 UASLP, Fac Med, Dept Immunol, San Luis Potosi 78210, Mexico. UASLP, Fac Med, Dept Pediat, San Luis Potosi 78210, Mexico. Hosp Cent Dr Ignacio Morones Prieto, San Luis Potosi, Mexico. Univ Nacl Autonoma Mexico, Dept Genet & Mol Physiol, Mexico City 04510, DF, Mexico. RP Gonzalez-Amaro, R, UASLP, Fac Med, Dept Immunol, Ave V Carranza 2405, San Luis Potosi 78210, Mexico. CR ATICI A, 1996, ACTA PAEDIATR, V85, P371 ATICI A, 1997, AM J PERINAT, V14, P401 BAZIL V, 1995, IMMUNOL TODAY, V16, P135 BERNER R, 1998, PEDIATR RES, V44, P469 BUCK C, 1994, PEDIATRICS, V93, P54 BUHRER C, 1994, PEDIATR RES, V36, P799 CANNON JG, 1990, J INFECT DIS, V161, P79 DEBONT ESJM, 1995, PEDIATR RES, V37, P626 DELPOZO MA, 1994, EUR J IMMUNOL, V24, P2586 DOELLNER H, 1998, J PEDIATR, V132, P295 FJAERTOFT G, 1999, PEDIATR RES, V45, P871 GONZALEZAMARO R, 1998, DRUGS, V56, P977 GONZALEZAMARO R, 1999, CRIT REV IMMUNOL, V19, P389 GRANT HW, 1997, PEDIATR SURG INT, V12, P289 GUYRE PM, 1990, J CLIN INVEST, V86, P1892 HUMBRIA A, 1994, ARTHRITIS RHEUM, V37, P342 KALAYCI AG, 1997, ACTA PAEDIATR, V86, P999 KHANDAKER MH, 1998, J IMMUNOL, V161, P1930 KLEIN JO, 1994, SEMIN PEDIAT INFECT, V5, P3 KUSTER H, 1999, LANCET, V353, P1271 LAFORGIA N, 1997, ACTA PAEDIATR, V86, P1097 MESSER J, 1996, J PEDIATR, V129, P574 MILLER LC, 1990, J PEDIATR, V117, P961 PANERO A, 1997, PEDIATR INFECT DIS J, V16, P370 PERUSSIA B, 1983, J EXP MED, V158, P1092 POWELL KR, 1995, INFECT DIS FETUS NEW, P134 RAVETCH JV, 1991, ANNU REV IMMUNOL, V9, P457 REBUCK N, 1995, CLIN EXP IMMUNOL, V101, P183 SILVEIRA RC, 1999, ACTA PAEDIATR, V88, P647 SULLIVAN JS, 1992, J PEDIATR, V120, P510 SULLIVAN KE, 1997, ARTHRITIS RHEUM, V40, P2207 TOROK C, 1993, ARCH DIS CHILD, V68, P561 TRACEY KJ, 1986, SCIENCE, V234, P470 WAAGE A, 1989, J EXP MED, V169, P333 WEIRICH E, 1998, J PEDIATR 1, V132, P445 NR 35 TC 6 PU BLACKWELL MUNKSGAARD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0905-6157 J9 PEDIATR ALLERGY IMMUNOL JI Pediatr. Allergy Immunol. PD OCT PY 2002 VL 13 IS 5 BP 319 EP 327 PG 9 SC Allergy; Immunology; Pediatrics GA 615JF UT ISI:000179241500003 ER PT J AU Corvera, J Corvera-Behar, G Lapilover, V Ysunza, A TI Objective evaluation of the effect of flunarizine on vestibular neuritis SO OTOLOGY & NEUROTOLOGY LA English DT Article DE flunarizine; vertigo; vestibular neuritis; vestibular autorotation testing; vestibular-oculomotor reflexes ID MIGRAINE; VERTIGO AB Objective: To determine whether vestibular autorotation tests (VAT) would show significant differences in vestibular oculomotor reflex (VOR) parameters in vertiginous patients before and after treatment with flunarizine. Study Design: Prospective study in a tertiary referral academic center. Methods: Twenty-three patients (10 men, 13 women, mean age 45.57 years, mean length of disease 99.48 days, mean treatment 38.61 days), with vertigo due to vestibular neuritis, underwent VAT testing before and after treatment with 5 mg of flunarizine daily. Results: The parameter improvement value (IV) resulted from subtracting posttreatment from pretreatment VAT numerical values. Regarding subjective improvement, 3 patients (13%) said they had none, 5 (21.7%) expressed moderate progress, 9 (39.1) considered the results satisfactory, and 6 (26%) became asymptomatic. The VAT results gave high positive IV for horizontal restriction, low positive for horizontal and vertical gains and horizontal asymmetry, and negative IV for horizontal phase and vertical restriction. Regarding the individual frequencies, horizontal and vertical gains improved in all the frequencies tested except one. The horizontal phase improved at low frequencies (2.0 and 2.3 Hz) and deteriorated from 2.7 to 3.9 Hz. Vertical and horizontal restriction showed both improvement and deterioration. Horizontal asymmetry displayed improvement from -0.01 at 2.0 Hz to 0.50 at 5.9 Hz, deteriorating from -0.41 at 9.0 Hz. Conclusions: Flunarizine is useful in the treatment of vertigo caused by vestibular neuritis. VAT is a valid instrument for the objective and quantitative evaluation of the vestibular-oculomotor reflexes. C1 Inst Mexicano Otol & Neurotol, Mexico City, DF, Mexico. RP Corvera, J, Canada 157,Jardines Pedregal, Mexico City 01900, DF, Mexico. CR CORVERA J, 2000, ARCH MED RES, V31, P384 DAVIS LE, 1983, AM J OTOLARYNG, V4, P347 DEBOCK GH, 1997, PHARM WORLD SCI, V19, P269 GUTH PS, 1998, PROG NEUROBIOL, V54, P193 OLESEN J, 1990, EUR NEUROL, V30, P31 ROLZHAUSER HP, 1991, ARZNEIMITTEL-FORSCH, V41, P109 ROSNER B, 2000, FUNDAMENTALS BIOSTAT SCHMIDT R, 1991, J CARDIOVASCULAR S8, V18, S27 SCHUKNECHT HF, 1981, ANN OTOL RHINOL LA S, V90, P1 VERSPEELT J, 1996, EUR J CLIN PHARMACOL, V51, P15 NR 10 TC 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 1531-7129 J9 OTOL NEUROTOL JI Otol. Neurotol. PD NOV PY 2002 VL 23 IS 6 BP 933 EP 937 PG 5 SC Clinical Neurology; Otorhinolaryngology GA 616WE UT ISI:000179325700020 ER PT J AU Chamizo, JA Morgado, J Castro, M Bernes, S TI Synthesis and structure of cis-palladium(II) carbene complexes containing the 1,3-diallylimidazolidin-2-ylidene ligand: trans -> cis rearrangement SO ORGANOMETALLICS LA English DT Article ID ELECTRON-RICH ALKENES; COORDINATION CHEMISTRY; METAL-COMPLEXES; DENSITY; OPTIMIZATION AB Palladium(II) carbene complexes with a 1,3-diallylimidazolidin-2-ylidene ligand (L-Allyl) were prepared and characterized by IR, NMR, and mass spectra. The trans --> cis rearrangement of the trans-[PdCl2(L-Allyl)(2)] complex was observed. The relative thermodynamic stability of these isomers was studied using DFT calculations. C1 Inst Mexicano Petr, Programa Ingn Mol, Eje Cent Lazaro Cardenas, Mexico City 07730, DF, Mexico. Natl Autonomous Univ Mexico, Fac Quim, Mexico City 04510, DF, Mexico. RP Morgado, J, Inst Mexicano Petr, Programa Ingn Mol, Eje Cent Lazaro Cardenas, CP 07730, Mexico City 07730, DF, Mexico. 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Using the beams from Nd:YAG laser (1064 nm and its second harmonic 532 nm), CTH:YAG laser (2.09 mum), CO2 laser (10.6 mum) and various laser beam parameters we found the optimum fluence and power density in order to obtain a similar fading appearance like the one obtained by conventional processes. The purpose of this work was to determine the effectiveness of laser-based technologies and to measure the wear characteristics of the processed textile like colorfastness, strength resistance, tearing strength, and dimensional changes. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 Ctr Invest Opt AC, Unidad Aguascalientes, Aguascalientes, Ags, Mexico. Inst Tecnol Aguascalientes, Aguascalientes, Ags, Mexico. RP Ortiz-Morales, M, Ctr Invest Opt AC, Unidad Aguascalientes, Prolongac Constituc 607,Reserva Loma Bonita, Aguascalientes, Ags, Mexico. CR DASCALU T, 2000, OPT LASER ENG, V34, P179 NR 1 TC 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0143-8166 J9 OPT LASER ENG JI Opt. Lasers Eng. PD JAN PY 2003 VL 39 IS 1 BP 15 EP 24 PG 10 SC Optics GA 615YH UT ISI:000179274600002 ER PT J AU Camacho, AA Solano, C Martinez-Ponce, G Baltazar, R TI Simple method to measure the focal length of lenses SO OPTICAL ENGINEERING LA English DT Article DE Gaussian beams; microlens characterization; Fourier optics ID MICROLENSES AB We present a simple method to measure the focal length of a lens of any size. This method consists in measuring the displacement of the transmitted spot image that occurs when a Gaussian beam impinges on a laterally displaced lens. It is shown that the method is consistent with alternative methods. (C) 2002 Society of Photo-Optical Instrumentation Engineers. C1 Ctr Invest Opt AC, Leon 37150, Guanajuato, Mexico. RP Camacho, AA, Ctr Invest Opt AC, Apartado Postal 1-948, Leon 37150, Guanajuato, Mexico. CR 2000, OPTICS OPTICAL INSTR CAMACHO AA, 2000, OPT ENG, V39, P2149 ERDMANN L, 1998, APPL OPTICS, V37, P676 HANS HP, 1997, MICROOPTICS ELEMENTS LIU J, 2001, APPL OPTICS, V40, P1686 MALACARA D, 1992, OPTICAL SHOP TESTING MALACARA D, 1994, HDB LENS DESIGN, P45 NICHOLAS BF, 1999, MICROOPTICS TECHNOLO NR 8 TC 0 PU SPIE-INT SOCIETY OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 2002 VL 41 IS 11 BP 2899 EP 2902 PG 4 SC Optics GA 614ZH UT ISI:000179221000027 ER PT J AU Trujillo-Schiaffino, G Malacara-Hernandez, D TI Null test compensators for ophthalmic lenses SO OPTICAL ENGINEERING LA English DT Article DE lenses; optical testing; refractive index ID HARTMANN TEST AB Testing methods commonly used for ophthalmic lenses produce a power distribution map that treats the lens as an independent element. This map, however, does not necessarily correspond to the refractive correction state of the lens when the observer looks through it. We describe a method to obtain a refractive correction map of an ophthalmic lens, which is an improved representation of its actual performance. (C) 2002 Society of Photo-Optical instrumentation Engineers. C1 AC, Ctr Invest Opt, Leon 37000, Gto, Mexico. RP Trujillo-Schiaffino, G, AC, Ctr Invest Opt, Apartado Postal 1-948, Leon 37000, Gto, Mexico. CR ATCHISON DA, 1992, APPL OPTICS, V31, P3579 BOURDONCLE B, 1992, APPL OPTICS, V31, P3586 CASTELLINI C, 1994, APPL OPTICS, V33, P4120 GHOZEIL I, 1992, OPTICAL SHOP TESTING, P367 KAFRI O, 1990, PHYSICS MOIRE METOLO KEREN E, 1992, P SOC PHOTO-OPT INS, V1752, P264 LIU LR, 1995, P SOC PHOTO-OPT INS, V2576, P253 MALACARA D, 1992, OPT ENG, V31, P1551 MALACARADOBLADO D, 1997, OPT ENG, V36, P2016 MALACARAHERNAND.D, 1994, HDB LENS DESIGN MEJIABARBOSA Y, 2001, OPTOMETRY VISION SCI, V78, P240 NAKANO Y, 1990, OPT LASER TECHNOL, V22, P195 TAM SC, 1990, P SOC PHOTO-OPT INS, V1400, P38 TRUJILLOSCHIAFFINO G, 2001, REV SCI INSTRUM, V72, P3622 YONTE T, 1991, P SPIE B, V1554, P233 NR 15 TC 0 PU SPIE-INT SOCIETY OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 2002 VL 41 IS 11 BP 2910 EP 2914 PG 5 SC Optics GA 614ZH UT ISI:000179221000029 ER PT J AU Riestra, AR Womack, KB Crucian, GP Heilman, KM TI Is the middle between both halves? Midpoint location and segment size estimation in neglect SO NEUROLOGY LA English DT Article ID UNILATERAL SPATIAL NEGLECT; LINE BISECTION JUDGMENTS; VISUAL NEGLECT; HEMISPATIAL NEGLECT; FUNCTIONAL-ANATOMY; LEFTWARD SEARCH; LANDMARK TASK; OBJECTS; SPACE; MECHANISMS AB Background: Line bisection errors in neglect are attributed to perceptual size distortions. In order to compare the two segments of the line to determine if they are equal, one might first estimate the location of a midpoint that defines the two line segments to be compared. Objectives: The authors attempted to determine whether estimating a line's midpoint can be dissociated from comparing the two segments of this line, and if so, what the relative contribution of each of these tasks is to the perceptual bias in neglect. Methods: The authors studied two patients with hemispatial neglect from right hemisphere lesions by asking them where bisection marks were placed on prebisected lines and whether the two adjacent line segments were equal. Results: There was a stronger bias judging the position of the bisecting marks ("where" determination) than comparing the size of two adjacent line segments. Conclusions: These results suggest that percepibal size distortion of line segments alone cannot explain the subjects' line bisection bias, but postperceptual deficits in "where" computations may better account for their errors locating the midpoint. "Where" determinations might require more attentional capacity, depend more heavily on viewer-centered allocation of attention, and be mediated by the right hemisphere's "where" dorsal stream. In contrast, comparing the length of two segments might be mediated by the left hemisphere's "what" ventral stream. C1 Natl Ctr Environm Hlth, Natl Inst Publ Hlth, Mexico City, DF, Mexico. Univ Florida, Dept Neurol, Gainesville, FL USA. Malcolm Randall Vet Adm Med Ctr, Gainesville, FL USA. RP Riestra, AR, Avenida San Antonio 158,Piso 7,Colonia Ciudad Dep, Mexico City 03710, DF, Mexico. 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Using tight-binding and ab initio calculations, it is observed that B-saturating tip edges of carbon nanotubes induce the presence of large peaks within the local density of states (LDOS) located in an energy region close to the Fermi level (Ef). These localized states suggest a field emission enhancement for the B-doped tubes. In addition, ab initio theoretical results indicate that the work function for B-doped tubes is 1.7 eV lower when compared to pure carbon-terminated nanotubes. Experimentally, it is found that B-doped tubes, which are produced by arc discharge techniques and contain B mainly at the tips, exhibit stable electron field emission at lower turn-on voltages (1.4 V/mum) when compared to pure single- and multiwalled carbon nanotubes (2.8 and 3.0 V/mum, respectively) measured under the same conditions. We strongly believe our results will bring new insights in the fabrication of stable field emission sources. C1 Univ Sussex, Sussex Nanosci & Nanotechnol Ctr, Brighton BN1 9QJ, E Sussex, England. Univ Catholique Louvain, PCPM, B-1348 Louvain, Belgium. Univ Catholique Louvain, CERMIN, B-1348 Louvain, Belgium. IPICyT, Adv Mat Dept, San Luis Potosi 78210, Mexico. Univ London Queen Mary Coll, Dept Phys, London E1 4NS, England. Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England. Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA. Oak Ridge Natl Lab, Comp & Computat Sci Directorate, Oak Ridge, TN 37831 USA. Max Planck Inst Met Res, D-70569 Stuttgart, Germany. RP Terrones, M, Univ Sussex, Sussex Nanosci & Nanotechnol Ctr, Brighton BN1 9QJ, E Sussex, England. CR AMARATUNGA GAJ, 1999, NEW DIAM FRONT C TEC, V9, P31 BACHTOLD A, 2001, SCIENCE, V294, P1317 BAUGHMAN RH, 1999, SCIENCE, V284, P1340 BAXENDALE M, UNPUB BLASE X, 1997, APPL PHYS LETT, V70, P197 BLASE X, 1999, PHYS REV LETT, V83, P5078 BRIGGS EL, 1995, PHYS REV B, V52, R5471 BRIGGS EL, 1996, PHYS REV B, V54, P14362 BRITTO PJ, 1996, BIOELECTROCH BIOENER, V41, P121 CARROLL DL, 1998, PHYS REV LETT, V81, P2332 CHOI WB, 1999, APPL PHYS LETT, V75, P3129 COLLINS PG, 2000, SCIENCE, V287, P1801 CZERW R, 2001, NANO LETTERS, V1, P457 DAI HJ, 1996, NATURE, V384, P147 DEHEER WA, 1995, SCIENCE, V270, P1179 DEVITA A, 1999, APPL PHYS A-MATER, V68, P283 DILLON AC, 1997, NATURE, V386, P377 GADD GE, 1997, SCIENCE, V277, P933 GAO YH, 2002, NATURE, V415, P599 GROBERT N, 1999, APPL PHYS LETT, V75, P3366 HAMADA N, 1992, PHYS REV LETT, V68, P1579 HAYDOCK R, 1972, J PHYS C, V5, P2845 HSU WK, 2000, J MATER CHEM, V10, P1425 KONG J, 2000, SCIENCE, V287, P622 LIJIMA S, 1991, NATURE, V354, P56 LIU K, 2001, PHYS REV B, V63 MEUNIER V, 2002, APPL PHYS LETT, V81, P26 REDLICH P, UNPUB SAITO R, 1992, APPL PHYS LETT, V60, P2204 SAITO Y, 1997, NATURE, V389, P554 TADA K, 2002, PHYS REV LETT, V88 TERRONES M, 1998, APPL PHYS A-MATER, V66, P307 TERRONES M, 1998, FULLERENE SCI TECHN, V6, P787 TERRONES M, 1999, TOP CURR CHEM, V199, P189 TERRONES M, 2000, CHEM COMMUN, V23, P2335 TRASOBARES S, 2001, EUR PHYS J B, V22, P117 WILDOER JWG, 1998, NATURE, V391, P59 ZHANG G, 2002, APPL PHYS LETT, V80, P2589 NR 38 TC 16 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 1530-6984 J9 NANO LETT JI Nano Lett. PD NOV PY 2002 VL 2 IS 11 BP 1191 EP 1195 PG 5 SC Chemistry, Multidisciplinary; Materials Science, Multidisciplinary GA 616JZ UT ISI:000179301800003 ER PT J AU Basiuk, EV Rybak-Akimova, EV Basiuk, VA Acosta-Najarro, D Saniger, JM TI Adsorption modification of single-walled carbon nanotubes with tetraazaannulene macrocyclic complexes SO NANO LETTERS LA English DT Article ID SIDEWALL FUNCTIONALIZATION; OPTICAL-PROPERTIES; CONFINEMENT; DISSOLUTION; REACTIVITY; FULL AB Single-walled carbon nanotubes (SWNTs) strongly adsorb macrocyclic tetraazaannulene complexes NiTMTAA and CuTMTAA from ethanol solutions, with a SWNT/complex mass ratio of ca. 5:4. According to the results of molecular mechanics modeling, this corresponds to dense monolayer coverage. A saddle-shaped conformation of the macrocyclic complexes facilitates their better accommodation on the cylindrical nanotube walls, resulting in highly ordered molecular arrays. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Ctr Ciencias Aplicadas & Desarrollo Tecnol, Mexico City 04510, DF, Mexico. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico. Tufts Univ, Dept Chem, Medford, MA 02155 USA. RP Basiuk, EV, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Ctr Ciencias Aplicadas & Desarrollo Tecnol, Mexico City 04510, DF, Mexico. 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PD NOV PY 2002 VL 2 IS 11 BP 1249 EP 1252 PG 4 SC Chemistry, Multidisciplinary; Materials Science, Multidisciplinary GA 616JZ UT ISI:000179301800014 ER PT J AU Ivison, RJ Greve, TR Smail, I Dunlop, JS Roche, ND Scott, SE Page, MJ Stevens, JA Almaini, O Blain, AW Willott, CJ Fox, MJ Gilbank, DG Serjeant, S Hughes, DH TI Deep radio imaging of the SCUBA 8-mJy survey fields: submillimetre source identifications and redshift distribution SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Review DE galaxies : formation; galaxies : starburst; cosmology : observations; early Universe ID ULTRAVIOLET LUMINOSITY DENSITY; GALAXY SMM J14011+0252; STAR-FORMATION HISTORY; ULTRALUMINOUS GALAXY; ENERGY-DISTRIBUTIONS; STARBURST GALAXIES; INFRARED-EMISSION; LOCAL UNIVERSE; MOLECULAR GAS; EVOLUTION AB The SCUBA 8-mJy survey is the largest submillimetre (submm) extragalactic mapping survey undertaken to date, covering 260 arcmin(2) to a 4sigma detection limit of similar or equal to8 mJy at 850 mum, centred on the Lockman Hole and ELAIS N2 regions. Here, we present the results of new 1.4-GHz imaging of these fields, of the depth and resolution necessary to reliably identify radio counterparts for 18 of 30 submm sources, with possible detections of a further 25 per cent. Armed with this greatly improved positional information, we present and analyse new optical, near-infrared (near-IR) and XMM Newton X-ray imaging to identify optical/IR host galaxies to half of the submm-selected sources in those fields. As many as 15 per cent of the submm sources detected at 1.4 GHz are resolved by the 1.4-arcsec beam and a further 25 per cent have more than one radio counterpart, suggesting that radio and submm emission arise from extended starbursts and that interactions are common. We note that less than a quarter of the submm-selected sample would have been recovered by targeting optically faint radio sources, underlining the selective nature of such surveys. At least 60 per cent of the radio-confirmed optical/IR host galaxies appear to be morphologically distorted; many are composite systems - red galaxies with relatively blue companions; just over one half are found to be very red (I - K > 3.3) or extremely red (I - K > 4); contrary to popular belief, most are sufficiently bright to be tackled with spectrographs on 8-m telescopes. We find one submm source which is associated with the steep-spectrum lobe of a radio galaxy, at least two more with flatter radio spectra typical of radio-loud active galactic nuclei (AGN), one of them variable. The latter is amongst four sources (=15 per cent of the full sample) with X-ray emission consistent with obscured AGN, though the AGN would need to be Compton thick to power the observed far-IR luminosity. We exploit our well-matched radio and submm data to estimate the median redshift of the S-850 mum similar to8 mJy submm galaxy population. If the radio/far-IR correlation holds at high redshift, and our sample is unbiased, we derive a conservative limit of (z) greater than or equal to2.0, or greater than or equal to2.4 using spectral templates more representative of known submm galaxies. C1 Royal Observ, Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland. Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland. Univ Durham, Dept Phys, Durham DH1 3LE, England. Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England. CALTECH, Dept Astron, Pasadena, CA 91125 USA. Univ Oxford, Dept Phys, Oxford OX1 3RH, England. Blackett Lab, Astrophys Grp, London SW7 2BW, England. Univ Kent, Sch Phys Sci, Ctr Astrophys & Planetary Sci, Canterbury CT2 7NZ, Kent, England. Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico. RP Ivison, RJ, Royal Observ, Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland. 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Not. Roy. Astron. Soc. PD NOV 21 PY 2002 VL 337 IS 1 BP 1 EP 25 PG 25 SC Astronomy & Astrophysics GA 615XY UT ISI:000179273700001 ER PT J AU Quintanilla-Licea, R Colunga-Valladares, JF Caballero-Quintero, A Rodriguez-Padilla, C Tamez-Guerra, R Gomez-Flores, R Waksman, N TI NMR detection of isomers arising from restricted rotation of the C-N amide bond of N-formyl-o-toluidine and N,N '-bis-formyl-o-tolidine SO MOLECULES LA English DT Article DE amide bond; restricted rotation; H-1-NMR; C-13-NMR; NOE ID FORMAMIDE AB Full and unambiguous assignment of all H-1- and C-13-NMR resonances of the isomers due to restricted C-N amide bond rotation of N-formyl-o-toluidine and N,N'-bisformyl-o-tolidine in DMSO-d(6) is reported. The cis-isomer predominates in the equilibrium mixture of both compounds as 1D-NOE difference experiments show. C1 Univ Autonoma Nuevo Leon, Fac Ciencias Biol, San Nicolas De Los Garza, Nuevo Leon, Mexico. Univ Autonoma Nuevo Leon, Fac Ciencias Quim, San Nicolas De Los Garza, Nuevo Leon, Mexico. Univ Autonoma Nuevo Leon, Fac Med, San Nicolas De Los Garza, Nuevo Leon, Mexico. RP Quintanilla-Licea, R, Univ Autonoma Nuevo Leon, Fac Ciencias Biol, Pedro De Alba S-N,Ciudad Univ, San Nicolas De Los Garza, Nuevo Leon, Mexico. CR AXE FU, 1998, J CHEM RES-S JAN, P1 BARBOIU V, 1973, ORG MAGN RESONANCE, V5, P43 FISCHER G, 2000, CHEM SOC REV, V29, P119 FRIEBOLIN H, 1993, BASIC ONE 2 DIMENSIO, P275 GALAT A, 1948, J AM CHEM SOC, V70, P1280 GEROTHANASSIS IP, 1996, J MAGN RESON SER B, V111, P220 HESSE M, 1984, SPEKTROSKOPISCHE MET, P124 KIM W, 1998, J CHEM SOC FARADAY T, V94, P2663 MADELUNG W, 1912, CHEM BER, V45, P1128 MARCH J, 1992, ADV ORG CHEM, P129 OKI M, 1983, TOP STEREOCHEM, V14, P1 QUINONERO D, 2001, NEW J CHEM, P259 QUINTANILLALICEA R, 2001, HETEROCYCLES, V55, P1365 REMERS WA, 1972, INDOLES 1, P385 SUHR JR, 1987, B KOR CHEM SOC, V8, P230 TAHA AN, 2000, J PHYS CHEM A, V104, P2985 TYSON FT, 1941, J AM CHEM SOC, V63, P2024 TYSON FT, 1955, ORG SYNTH, V3, P479 ULLRICH S, 2001, PHYS CHEM CHEM PHYS, V3, P5450 VAARA J, 1997, J PHYS CHEM A, V101, P5069 NR 20 TC 1 PU MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL PI BASEL PA SAENGERGASSE 25, CH-4054 BASEL, SWITZERLAND SN 1420-3049 J9 MOLECULES JI Molecules PD AUG PY 2002 VL 7 IS 8 BP 662 EP 673 PG 12 SC Chemistry, Organic GA 616KL UT ISI:000179302900007 ER PT J AU Sanchez-Guillen, MC Barnabe, C Guegan, JF Tibayrenc, M Velasquez-Rojas, M Martinez-Munguia, J Salgado-Rosas, H Torres-Rasgado, E Rosas-Ramirez, MI Perez-Fuentes, R TI High prevalence anti-Trypanosoma cruzi antibodies, among blood donors in the state of Puebla, a non-endemic area of Mexico SO MEMORIAS DO INSTITUTO OSWALDO CRUZ LA English DT Article DE Chagas disease; seroprevalence; blood donors; antibodies to Trypanosoma cruzi; autochthonous antigens; Puebla; Mexico ID CHAGAS-DISEASE; TRANSMISSION; TRANSFUSION; DIAGNOSIS; COUNTRIES; STRAINS; AMERICA AB Blood transfusion is the second most common transmission route of Chagas disease in many Latin American countries. In Mexico, the prevalence of Chagas disease and impact of transfusion of Trypanosoma cruzi-contaminated blood is not clear. We determined the seropositivity to T. cruzi in a representative random sample, of 2.140 blood donors (1,423 men and 647 women, aged 19-65 years), from a non-endemic state of almost 5 millions of inhabitants by the indirect hemagglutination (IHA) and enzyme linked immunosorbent assay (ELISA) tests using one autochthonous antigen from T. cruzi parasites, which were genetically characterized like TBAR/ME/1997/RyD-V1 (T. cruzi I) isolated from a Triatoma barberi specimen collected in the same locality. The seropositivity was up to 8.5% and 9% with IHA and ELISA tests, respectively, and up to 7.7% using both tests in common. We found high seroprevalence in a non-endemic area of Mexico, comparable to endemic countries where the disease occurs, e.g. Brazil (0.7%). Bolivia (13.7%) and Argentina (3.5%). The highest values observed in samples from urban areas, associated to continuous rural emigration and the absence of control in blood donors, suggest unsuspected high risk of transmission of T. cruzi, higher than those reported for infections by blood e.g. hepatitis (0.1%) and AIDS (0.1%) in the same region. C1 Benemerita Univ Autonoma Puebla, Fac Med, Puebla, Mexico. Hosp Especialidades Ctr Med La Raza, Ctr Med Nacl Manuel Avila Camacho, IMSS Puebla, Ctr Invest Biomed Oriente,Lab Parasitol, Puebla, Mexico. Hosp Especialidades Ctr Med La Raza, Ctr Med Nacl Manuel Avila Camacho, IMSS Puebla, Banco Cent Sangre, Puebla, Mexico. Hosp Especialidades Ctr Med La Raza, Ctr Med Nacl Manuel Avila Camacho, IMSS Puebla, Coordinac Delegac Epidemiol, Puebla, Mexico. Inst Rech Dev, Ctr Etud Polymorphisme Microorganismes, Montpellier, France. RP Perez-Fuentes, R, Benemerita Univ Autonoma Puebla, Fac Med, 13 Sur 2901,Col Volcanes, Puebla, Mexico. 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Inst. Oswaldo Cruz PD OCT PY 2002 VL 97 IS 7 BP 947 EP 952 PG 6 SC Parasitology; Tropical Medicine GA 614WY UT ISI:000179215500004 ER PT J AU Sanchez-Hernandez, C Romero-Almaraz, MD Cuisin, J TI Sturnira mordax (Chiroptera, Phyllostomidae), in Ecuador SO MAMMALIA LA English DT Article C1 Natl Autonomous Univ Mexico, Inst Biol, Dept Zool, Mexico City 04510, DF, Mexico. Museum Natl Hist Nat, Lab Mammiferes & Oiseaux, F-75005 Paris, France. RP Sanchez-Hernandez, C, Natl Autonomous Univ Mexico, Inst Biol, Dept Zool, AP 70-153, Mexico City 04510, DF, Mexico. CR ALBERICO M, 1982, CESPEDESIA S, V3, P31 ALBERICO M, 1994, TRIANEA, V5, P335 ALBERICO M, 2000, BIOTA COLOMBIANA, V1, P43 ALBUJA L, 1982, MURCIELAGOS ECUADOR DAVIS WB, 1964, J MAMMAL, V45, P375 DAVIS WB, 1980, OCCAS PAP MUS TEXAS, V70, P1 GARDNER AL, 1970, J MAMMAL, V51, P712 GOODWIN GG, 1938, AM MUS NOVIT, V976, P1 GOODWIN GG, 1946, B AM MUS NAT HIST, V87, P271 HALL RE, 1981, MAMMALS N AM KOOPMAN KF, 1993, MAMMAL SPECIES WORLD, P137 PACHECO V, 1991, B AM MUS NAT HIST, V206, P101 SWANEPOEL P, 1979, SPEC PUBL MUS TEXAS, V16, P13 NR 13 TC 0 PU MUSEUM NAT HIST NATURELLE PI PARIS PA SERVICE PUBLICATIONS SCIENTIFIQUES, 57 RUE CUVIER, 75005 PARIS, FRANCE SN 0025-1461 J9 MAMMALIA JI Mammalia PY 2002 VL 66 IS 3 BP 439 EP 441 PG 3 SC Zoology GA 611FW UT ISI:000179006600011 ER PT J AU Ricalde, RHS Lean, IJ TI Effect of feed intake during pregnancy on productive performance and grazing behaviour of primiparous sows kept in an outdoor system under tropical conditions SO LIVESTOCK PRODUCTION SCIENCE LA English DT Article DE pig-feeding and nutrition; tropical environment; digestible energy; pregnancy; grazing ID ENVIRONMENTAL-TEMPERATURE; REPRODUCTIVE-PERFORMANCE; AMBIENT-TEMPERATURE; ENERGY-METABOLISM; BODY RESERVES; GROWING PIGS; FEMALE PIGS; GROWTH; NUTRITION; PROTEIN AB Twenty-four primiparous sows were allocated randomly in four blocks distributed through a year to evaluate the effect of feeding level on productive performance and grazing behaviour of primiparous pregnant sows kept outdoors under tropical conditions. Three diets designed to supply 19 (L), 26 (M) and 33 (H) MJ of DE/day were used. The sows had opportunity to graze freely in a paddock of star grass (SG). Total weight gain (kg) from mating to weaning increased linearly as feeding level increased (L: 30.5, M: 36.3, H: 48.7; P < 0.05). However, sows in treatment L had a negative balance in back fat depth (mm) (L: - 1.3, M: 0.5 H: 3.6; P < 0.05) during the same period. Time spent grazing (min/day) (L: 130.4, M: 96. 1, H: 67.8; P < 0.05) grazing activity (%) (L: 17.4, M: 13.2, H: 9.2; P < 0.05) and distances walked (meters) (L: 305.8, M: 185.8, H: 169.8; P < 0.05) reduced significantly with dietary energy intake. Rectal temperature (T) increased significantly (P < 0.05) as energy intake increased (L: 38.9, M: 39.1, H: 39. 1; P < 0.05). The average ambient temperature recorded during daytime in block IV was higher (34.0 &DEG;C) than average ambient temperature recorded in block I (29.6 &DEG;C), II (29.5 &DEG;C) and III (28.8 &DEG;C). There was a significant (P < 0.05) treatment X block (season) interaction for distance walked. Also, a significant (P < 0.05) block X days of pregnancy (D) interaction for grazing time, distances walked and rectal temperature. In our experimental conditions, 26 MJ DE/day was sufficient to ensure live weight gain and back fat gain during pregnancy in primiparous sows. Increases in feed intake during pregnancy reduced grazing behaviour during daytime and increased the rectal temperature. The interactions observed suggested that extremely high ambient temperature had more effect on grazing behaviour and body temperature than energy intake in pregnant sows kept outdoors under tropical conditions. © 2002 Elsevier Science B.V. All rights reserved. C1 UADY, Fac Med Vet & Zootecn, Yucatan 97000, Mexico. Univ London Wye Coll, Ashford TN25 5AH, Kent, England. RP Ricalde, RHS, UADY, Fac Med Vet & Zootecn, Apartado Postal 4-116 Itzimna, Yucatan 97000, Mexico. 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Prod. Sci. PD OCT PY 2002 VL 77 IS 1 BP 13 EP 21 PG 9 SC Agriculture, Dairy & Animal Science GA 615UH UT ISI:000179264900002 ER PT J AU Aviles, A Neri, N Cuadra, I Alvarado, I Fernandez, R Calva, A Huerta-Guzman, J TI Lack of prognostic factors in follicular lymphoma SO LEUKEMIA & LYMPHOMA LA English DT Article DE malignant lymphoma; follicular lymphoma; prognostic factors; chemotherapy; radiation therapy ID NON-HODGKINS-LYMPHOMA; LOW-GRADE LYMPHOMA; HIGH-DOSE THERAPY; TERM FOLLOW-UP; LONG-TERM; MULTIVARIATE-ANALYSIS; CHEMOTHERAPY; INDEX; IDENTIFICATION; RADIOTHERAPY AB We performed a retrospective analysis of prognostic factors in patients with stage III and IV and high-tumor burden follicular lymphoma ( FL) treated with uniform schedules and with a long term follow-up. Eight-hundred and ten patients treated with intensive, anthracycline-based, chemotherapy and adjuvant radiotherapy to sites of initial bulky nodal disease were the basis of this analysis. Age >60 years, presence of B symptoms, bulky disease, >2 extranodal sites involved, high levels of LDH and the presence of serous effusions all identified as worse prognostic factors in univariate analysis were subject to multivariate analysis. Three factors remained significant: age >60 years old, presence of B symptoms and. 2 extranodal sites involved and these were found to influence overall survival ( OS) and progression-free survival (PFS). We developed a score system and only two groups ( score 0 and 1 and score 2 and 3) showed statistical significance in OS. When the International Prognostic Index was applied to these patients, no statistical differences were observed in OS and PFS between the four groups. Comparison of our results with multiple previous studies showed a lack of uniform prognostic factors and adequate prognostic classification could not be performed. In conclusion, it is mandatory for multicentric international clinical analysis to define prognostic factors and search for a clinical classification, as in diffuse large B cell lymphoma, so as to define groups of FL for more aggressive or conservative therapy. C1 Oncol Hosp, Natl Med Ctr, IMSS, Oncol Res Unit, Mexico City, DF, Mexico. RP Aviles, A, Oncol Hosp, Natl Med Ctr, IMSS, Oncol Res Unit, Mexico City, DF, Mexico. 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Lymphoma PY 2003 VL 44 IS 1 BP 143 EP 147 PG 5 SC Hematology; Oncology GA 615JX UT ISI:000179243000020 ER PT J AU de Leon, L TI Childly language: Children, language and the social world. SO LANGUAGE IN SOCIETY LA English DT Book Review C1 CIESAS Sureste, Ctr Res & Higher Studies Social Anthropol, San Cristobal de las Casas, Chiapas, Mexico. RP de Leon, L, CIESAS Sureste, Ctr Res & Higher Studies Social Anthropol, San Cristobal de las Casas, Chiapas, Mexico. CR DELEON L, 1998, J LINGUISTIC ANTHR, V8, P131 FOWLER R, 1991, LANGUAGE NEWS DISCOU GOODWIN MH, 1990, HE SAID SHE SAID TAL HEATH SB, 1983, WAYS WORDS LANGUAGE OCHS E, 1988, CULTURE LANGUAGE DEV OCHS E, 1995, HDB CHILD LANGUAGE SCHIEFFELIN B, 1990, GIVE TAKE EVERYDAY L SEALY A, 2000, CHILDLY LANGUAGE CHI STUBBS M, 1996, TEXT CORPUS ANAL NR 9 TC 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH ST, NEW YORK, NY 10011-4221 USA SN 0047-4045 J9 LANG SOC JI Lang. Soc. PD NOV PY 2002 VL 31 IS 5 BP 783 EP 786 PG 4 SC Applied Linguistics; Sociology GA 616JD UT ISI:000179299900007 ER PT J AU Espinoza-Ramos, LI Ramirez, C Hallen-Lopez, JM Arce, E Palomar-Pardave, M Romero-Romo, M TI Electrochemical study of passive layer formation on lead-base alloys immersed in 5.31 M H2SO4 solution SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROREDUCTION; ELECTRODES; TEMPERATURE; NUCLEATION; BATTERIES; MECHANISM; FILMS AB The process for the anodic formation of PbSO4 films was studied over lead and two tin-containing lead-alloys electrodes with high- and low-tin contents, in 5.31 M sulfuric acid aqueous solution, using the potential step technique. It was found that the mechanism governing the formation of the lead sulfate anodic film was common for the overall electrodic process and that it takes place comprising three different contributions to the total current [J(t)]. The individual contributions defined were J(g) the current density contribution due to 2D nucleation and growth of an insoluble PbSO4 conducting adlayer, J(d) the current density involved during electrodissolution of the lead electrode in the zones which were not covered yet by the lead sulfate film, and J(f) was the current due to the growth of the passive layer induced by electrodissolution of lead metal and transport of the resulting Pb(II) ions through the PbSO4 film. However, each stage contributed to the overall process in a different manner depending upon the Pb:Sn ratio. The results from voltammetry indicated that it is possible to establish the potential at which the lead sulfate film begins to form and that this was also a function of the ratio. The oxidation potential resulted most positive for the low-tin-containing alloy electrode. For all cases, the applied potential needed to form the passive layer influenced the relative importance of each contribution to the overall process. (C) 2002 The Electrochemical Society. C1 Inst Politecn Nacl, ESIQIE, Dept Ingn Met, Mexico City, DF, Mexico. Univ Autonoma Metropolitana Azcapotzalco, Area Ciencia Mat, Dept Mat, Mexico City 13, DF, Mexico. RP Espinoza-Ramos, LI, Inst Politecn Nacl, ESIQIE, Dept Ingn Met, Mexico City, DF, Mexico. CR BAGSHAW NE, 1995, J POWER SOURCES, V53, P25 BULLOCK KR, 1994, J POWER SOURCES, V51, P1 DEMARCO R, 2001, J APPL ELECTROCHEM, V31, P953 FLEISCHMANN M, 1955, T FARADAY SOC, V51, P71 GARCHE J, 2001, PHYS CHEM CHEM PHYS, V3, P356 HAMPSON NA, 1980, J ELECTROANAL CHEM, V107, P177 HARRISON JA, 1971, ELECTROANALYTICAL CH, V5, P67 NORTON PB, 1994, NEW ENCY BRITANNICA, V18, P397 PALOMARPARDAVE M, 1998, J ELECTROANAL CHEM, V443, P125 PALOMARPARDAVE M, 1998, SURF SCI, V399, P80 SLAVKOV D, 2001, EL SOC INT SOC EL M SMITH RM, 1975, CRITICAL STABILITY C, V2 SMITH RM, 1975, CRITICAL STABILITY C, V4 VARELA FE, 1992, ELECTROCHIM ACTA, V37, P1119 VARELA FE, 1993, ELECTROCHIM ACTA, V38, P1520 VARELA FE, 1993, J ELECTROANAL CHEM, V353, P147 VARELA FE, 1995, J APPL ELECTROCHEM, V25, P358 VARELA FE, 1995, J APPL ELECTROCHEM, V25, P364 NR 18 TC 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD DEC PY 2002 VL 149 IS 12 BP B543 EP B550 PG 8 SC Materials Science, Coatings & Films; Electrochemistry GA 616DP UT ISI:000179286700021 ER PT J AU Gutierrez-Pena, E Rueda, R TI Reference priors for exponential families SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE affine dual foliations; Bayesian inference; cut; natural exponential family; quadratic variance function; reference prior ID NONINFORMATIVE PRIORS; FREQUENTIST VALIDITY; BAYESIAN-INFERENCE; QUADRATIC VARIANCE; DISTRIBUTIONS; PARAMETERS AB Reference analysis, introduced by Bernardo (J. Roy. Statist. Soc. 41 (1979) 113) and further developed by Berger and Bernardo (On the development of reference priors (with discussion). In: J.M. Bernardo, J.O. Berger, A.P. Dawid, A.F.M. Smith (Eds.), Bayesian Statistics, Vol. 4, Clarendon Press, Oxford, pp. 35-60), has proved to be one of the most successful general methods to derive noninformative prior distributions. In practice, however, reference priors are typically difficult to obtain. In this paper we show how to find reference priors for a wide class of exponential family likelihoods. (C) 2001 Elsevier Science B.V. All rights reserved. C1 UNAM, IIMAS, Dept Probabilidad & Estadist, Mexico City 01000, DF, Mexico. CR BARNDORFFNIELSE.O, 1983, ANN STAT, V11, P753 BARNDORFFNIELSE.OE, 1978, INFORMATION EXPONENT BARNDORFFNIELSE.OE, 1995, THEOR PROBAB APPL, V40, P361 BERGER JO, 1989, J AM STAT ASSOC, V84, P200 BERGER JO, 1992, BAYESIAN STATISTICS, V4, P35 BERGER JO, 1992, BIOMETRIKA, V79, P25 BERNARDO JM, 1979, J ROY STAT SOC B MET, V41, P113 BERNARDO JM, 1994, BAYESIAN THEORY BERNARDO JM, 1998, J ROY STAT SOC D-STA, V47, P101 BOX GEP, 1973, BAYESIAN INFERENCE S CASALIS M, 1991, CR ACAD SCI I-MATH, V312, P537 CASALIS M, 1996, ANN STAT, V24, P1828 CHHIKARA RS, 1989, INVERSE GAUSSIAN DIS CONSONNI G, 2000, ORDER INVARIANT GROU DATTA GS, 1995, J AM STAT ASSOC, V90, P1357 DATTA GS, 1996, ANN STAT, V24, P141 DATTA GS, 1996, BIOMETRIKA, V83, P287 EFSTATHIOU M, 1998, SCAND J STAT, V25, P77 GUTIERREZPENA E, 1995, J AM STAT ASSOC, V90, P1347 JEFFREYS H, 1961, THEORY PROBABILITY LETAC G, 1997, EXPONENTIAL BAYESIAN, V6, P79 LISEO B, 1993, BIOMETRIKA, V80, P295 MENDOZA M, 1994, TEST, V3, P173 MORRIS CN, 1982, ANN STAT, V10, P65 SCHRODINGER E, 1915, PHYS Z, V16, P289 SMITH BA, 1997, J L POLY, V6, P1 SUN DC, 1996, BIOMETRIKA, V83, P55 YANG R, 1995, TEST, V4, P83 NR 28 TC 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STATIST PLAN INFER JI J. Stat. Plan. Infer. PD JAN 15 PY 2003 VL 110 IS 1-2 BP 35 EP 54 PG 20 SC Statistics & Probability GA 616CZ UT ISI:000179285300004 ER PT J AU Millan, MAP Correa, FG TI Determination of mercury in urine of Mexican dentists by neutron activation analysis SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY LA English DT Article ID ALZHEIMERS-DISEASE; EXPOSURE; SPECTROMETRY; AMALGAM; VAPOR AB Mercury levels in the urine of Mexican dentists were determined by instrumental neutron activation analysis. A control group with no suspicion of contamination by mercury was also studied. Acid digestion was used for samples treatment and the presence of Hg-203 was determined by gamma spectroscopy. The ranges of mercury concentration found in urine were: for the dentists group from 0.19 to 11.56 mug Hg/l, with a mean value of 3.16 mug Hg/l and standard deviation of 2.74 mug Hg/l, and for the control group from 0.03 to 0.05 mug Hg/l with a mean value of 0.04 mug Hg/l and standard deviation of 0.01 mug Hg/l. The mercury levels found in urine of dentists are associated with several exposure factors which appear to be positively correlated to its concentration, such as years of dental practice, amalgamation techniques, etc. C1 Univ Autonoma Estado Mexico, Fac Odontol, Mexico City, DF, Mexico. Inst Nacl Invest Nucl, Dept Quim, Mexico City 11801, DF, Mexico. RP Millan, MAP, Univ Autonoma Estado Mexico, Fac Odontol, Jesus Carranza 100 Esq Paseo Tollocan, Mexico City, DF, Mexico. CR BLOTCKY AJ, 1986, J RSE NBS, V91, P93 BLOTCKY AJ, 1995, J RADIOAN NUCL CH AR, V195, P109 CHANG SB, 1992, J DENT RES, V71, P66 CHIEN YC, 1996, SCI TOTAL ENVIRON, V188, P39 COOK T, 1976, BR DENT J, V127, P553 CORNETT CR, 1995, J RADIOAN NUCL CH AR, V195, P117 CURRIE LA, 1968, ANAL CHEM, V40, P586 ECHEVERRIA D, 1995, NEUROTOXICOL TERATOL, V17, P161 FUKUSHI K, 1993, ANAL LETT, V26, P325 HAMMOND PB, 1980, TOXICOLOGY, P421 HANNA CP, 1993, ANAL CHEM, V65, P653 HURSH JB, 1976, ARCH ENVIRON HEALTH, V31, P302 IYENGAR V, 1988, CLIN CHEM, V34, P474 KINGMAN A, 1994, J DENT RES, V73, P307 KRISHNAN SS, 1985, J RADIOANAL NUCL CHE, V93, P327 LANGAN DC, 1992, J AM DENT ASSOC, V145, P789 MARTIN MD, 1995, J AM DENT ASSOC, V126, P1502 NALEWAY C, 1985, J AM DENT ASSOC, V111, P37 RAJPUT AH, 1993, ARCH NEUROL-CHICAGO, V50, P651 ROSSOR M, 1993, BRIT MED J, V307, P779 TANNER CM, 1992, OCCUP MED, V7, P503 WENSTRUP D, 1990, BRAIN RES, V533, P125 YOSHIDA M, 1982, INT ARCH OCC ENV HEA, V51, P99 NR 23 TC 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0236-5731 J9 J RADIOANAL NUCL CHEM JI J. Radioanal. Nucl. Chem. PD NOV PY 2002 VL 254 IS 2 BP 305 EP 309 PG 5 SC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology GA 616LJ UT ISI:000179305000013 ER PT J AU Dossetti-Romero, V Mendez-Bermudez, JA Lopez-Cruz, E TI Thermal diffusivity, thermal conductivity and resistivity of candelilla wax SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article AB We report the values of some thermal and electrical properties of candelilla wax (from Euphorbia cerifera). The open-cell photoacoustic technique and another photothermic technique based on the measurement of the temperature decay of a heated sample-were employed to obtain the thermal diffusivity (alpha(S) = 0.026 +/- 0.00095 cm(2) s(-1)) as well as the thermal conductivity (k = 2.132 +/- 0.16 W mK(-1)) of this wax. The Kelvin null method was used to measure the dark decay of the surface potential of the sample after a corona discharge, giving a resistivity of p(e) = 5.98 +/- 0.19 x 10(17) Omega cm. C1 Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico. RP Mendez-Bermudez, JA, Univ Autonoma Puebla, Inst Fis, Apartado Postal J-48, Puebla 72570, Mexico. CR ABRAHAM M, 1952, ELECT MAGNETISM CAMPOS M, 1978, APPL PHYS LETT, V32, P794 COSTARIBEIRO J, 1948, REV SCI, V86, P229 DECAMPOS MS, 1977, P INT S EL DIEL RIO, P413 DONADO F, 2002, FERROELECTRICS, V270, P93 HATTA I, 1979, REV SCI INSTRUM, V50, P292 LEON G, 1998, REV MEX FIS, V44, P506 MANDELIS A, 1987, PHOTOACOUSTIC THERMA MONTERO P, 1995, J FOOD SCI, V60, P1 MURPHY P, 1968, J AUDIO ENG SOC, V16, P450 PERONDI LF, 1987, J APPL PHYS, V62, P2955 ROSENCWAIG A, 1976, J APPL PHYS, V64 SESSLER G, 1962, J ACOUST SOC AM, V34, P1782 SESSLER GM, 1985, P 5 INT S EL HEID WEAST RC, 1985, CRC HDB CHEM PHYSICS WILLIAMS R, 1968, J APPL PHYS, V39, P3731 NR 16 TC 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MATTER JI J. Phys.-Condes. Matter PD OCT 21 PY 2002 VL 14 IS 41 BP 9725 EP 9732 PG 8 SC Physics, Condensed Matter GA 614WK UT ISI:000179214300030 ER PT J AU Ruiz-Morales, Y TI HOMO-LUMO gap as an index of molecular size and structure for polycyclic aromatic hydrocarbons (PAHs) and asphaltenes: A theoretical study. I SO JOURNAL OF PHYSICAL CHEMISTRY A LA English DT Review ID CHEMICAL-SHIFT TENSORS; PI RESONANCE ENERGIES; BENZENOID HYDROCARBONS; PETROLEUM ASPHALTENES; ABSOLUTE HARDNESS; TOPOLOGICAL CHARACTERISTICS; CORRELATION SPECTROSCOPY; CONJUGATED HYDROCARBON; ABSORPTION-SPECTRA; KINETIC STABILITY AB Theoretical calculations are presented for the effect on the HOMO-LUMO gap due to the successive addition of aromatic rings and their different distributions, isomers, for polycyclic aromatic hydrocarbons (PAHs). The study is based on ZINDO/S calculations. PAHs with 1-14 fused aromatic rings (FAR) are considered. The results of these calculations are addressed to a currently existing controversy regarding the number of FAR in asphaltene structures. Asphaltenes are considered as polycyclic aromatic compounds similar to PAHs but containing heteroatoms and alkyl side chains. The theoretical results are compared with fluorescence emission (FE) experimental data. It is found that the asphaltene experimental FE range does not necessarily correspond to different chromophores with different number of FAR but may be different isomers with the same number of FAR. Also, the effect of the presence of alkyl chains and heteroatoms in the asphaltene structures on the HOMO-LUMO gap is almost negligible. We conclude that the FAR region in asphaltenes has PAH chromophores with 5-10 fused rings. The 100% compactness (circular) PAH structures, beyond 10 fused rings, and the 0% compactness (linear or zigzag) PAH structures are not possible for asphaltenes. Relationships between the HOMO-LUMO gap and structural parameters for PAH chromophores in asphaltenes were found. The effect of the number of FAR and Clar sextets, the compactness, and longest dimension on the HOMO-LUMO gap of PAHs is evaluated. C1 Inst Mexicano Petr, Programa Ingn Mol, Mexico City 07730, DF, Mexico. RP Ruiz-Morales, Y, Inst Mexicano Petr, Programa Ingn Mol, Eje Lazaro Cardenas 152, Mexico City 07730, DF, Mexico. 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Phys. Chem. A PD NOV 21 PY 2002 VL 106 IS 46 BP 11283 EP 11308 PG 26 SC Chemistry, Physical GA 617AD UT ISI:000179336100044 ER PT J AU Salceda, E Garateix, A Soto, E TI The sea anemone toxins BgII and GgIII prolong the inactivation time course of the tetrodotoxin-sensitive sodium current in rat dorsal root ganglion neurons SO JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS LA English DT Article ID ALPHA-SCORPION TOXIN; BUNODOSOMA-GRANULIFERA; IONIC CURRENTS; FUNCTIONAL-ANATOMY; SENSORY NEURONS; CHANNEL; RESIDUES; CELLS; NEUROTOXINS; MODULATION AB We have characterized the effects of BgII and BgIII, two sea anemone peptides with almost identical sequences (they only differ by a single amino acid), on neuronal sodium currents using the whole-cell patch-clamp technique. Neurons of dorsal root ganglia of Wistar rats (P5-9) in primary culture (Leibovitz's L15 medium; 37degreesC, 95% air/5% CO2) were used for this study (n = 154). These cells express two sodium current subtypes: tetrodotoxin-sensitive (M-S; K-i = 0.3 nM) and tetroclotoxin-resistant (TTX-R; K-i = 100 muM). Neither BgII nor BgIII had significant effects on TTX-R sodium current. Both BgII and BgIII produced a concentration-dependent slowing of the TTX-S sodium current inactivation (IC50 = 4.1 +/- 1.2 and 11.9 +/- 1.4 muM, respectively), with no significant effects on activation time course or current peak amplitude. For comparison, the concentration-dependent action of Anemonia sulcata toxin II (ATX-II), a well characterized anemone toxin, on the TTX-S current was also studied. ATX-II also produced a slowing of the TTX-S sodium current inactivation, with an IC50 value of 9.6 +/- 1.2 muM indicating that BgII was 2.3 times more potent than ATX-II and 2.9 times more potent than BgIII in decreasing the inactivation time constant (tau(h)) of the sodium current in dorsal root ganglion neurons. The action of BgIII was voltage-dependent, with significant effects at voltages below -10 mV. Our results suggest that BgII and BgIII affect voltage-gated sodium channels in a similar fashion to other sea anemone toxins and a-scorpion toxins. C1 Univ Autonoma Puebla, Inst Fisiol, Puebla 72001, Mexico. Minist Ciencia Tecnol & Medio Ambieute, Inst Oceanol, Havana, Cuba. RP Salceda, E, Univ Autonoma Puebla, Inst Fisiol, Apartado Postal 406, Puebla 72001, Mexico. 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Pharmacol. Exp. Ther. PD DEC PY 2002 VL 303 IS 3 BP 1067 EP 1074 PG 8 SC Pharmacology & Pharmacy GA 616EN UT ISI:000179290500024 ER PT J AU Bocanegra-Bernal, MH De la Torre, SD TI Phase transitions in zirconium dioxide and related materials for high performance engineering ceramics SO JOURNAL OF MATERIALS SCIENCE LA English DT Review ID PARTIALLY-STABILIZED ZIRCONIA; TETRAGONAL ZRO2 POLYCRYSTALS; MECHANICAL-PROPERTIES; MG-PSZ; FRACTURE-TOUGHNESS; SOLID-SOLUTION; MARTENSITIC-TRANSFORMATION; MULLITE-ZRO2 COMPOSITES; AL2O3/ZRO2 COMPOSITES; Y2O3-STABILIZED ZRO2 AB Because of its outstanding mechanical properties, zirconia-based ceramics are considered as some of the best potential materials within the engineering ceramics field that might be widely used to substitute various metallic parts and specific alloys. Taking into account the transformation toughening mechanisms that operates in their microstructure, important properties can be obtained. Phase transitions as well as transformation toughening in ZrO2 are reviewed briefly with the purpose to understand its effects in some composites and glass systems. Zirconia ceramics as high toughness materials for cutting tool, metal forming applications, mechanically superior ceramics called partially stabilised zirconia (PSZ), solid electrolytes, have been fabricated using the martensitic nature of the tetragonal to monoclinic phase transition. (C) 2002 Kluwer Academic Publishers. C1 CIMAV SC, Ctr Invest Mat Avanzados, Div Mat Ceram & Beneficio Minerales, Chihuahua 31109, Mexico. RP Bocanegra-Bernal, MH, CIMAV SC, Ctr Invest Mat Avanzados, Div Mat Ceram & Beneficio Minerales, Miguel de Cervantes 120 Complejo Ind Chihuahua, Chihuahua 31109, Mexico. 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1985, AM CERAM SOC BULL, V64, P298 WOLTEN GM, 1963, J AM CERAM SOC, V46, P418 YAN WY, 1997, ACTA MATER, V45, P1969 YOSHIMURA M, 1987, J MATER SCI LETT, V6, P465 ZHUKOVSKAYA AE, 1975, FIZ KHIM TEKHNOL SIL, P15 NR 173 TC 6 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD DEC 1 PY 2002 VL 37 IS 23 BP 4947 EP 4971 PG 25 SC Materials Science, Multidisciplinary GA 614QT UT ISI:000179201600001 ER PT J AU Almodovar, NS Font, R Portelles, J Raymond, O Siqueiros, JM TI Phase formation and characterization of [Fe, Mg]NbO4 as a new precursor for the PMN-PFN system SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID LEAD MAGNESIUM NIOBATE; DIELECTRIC-PROPERTIES; SINTERING CONDITIONS; IRON NIOBATE; CERAMICS; MICROSTRUCTURE; FABRICATION; RELAXORS; ROUTE AB An X-ray diffraction (XRD) and scanning electron microscopy (SEM) study of the phase composition and microstructure characteristics of the Mg(1-x)/3Nb(4-x)/6Fex/2O2 (x=0.5) chemical compound is presented. The samples were prepared by the conventional ceramic method and subjected to different heat treatments. Columbite (MgNb2O6) and iron niobium oxide (FeNbO4, Wolframite) were identified as intermediate compounds in the reaction. A new single phase precursor for the (1-x)Pb(Mg1/3Nb2/3)O-3-xPb(Fe1/2Nb1/2)O-3 (PMN-PFN) system identified as [Fe, Mg]NbO4, was obtained, isostructural with the FeNbO4 where Fe and Mg ions occupy the same crystal site (space group P1 21a 1). From the Rietveld refinement method the cell parameters of the monoclinic structure were determined. The microstructure analysis indicates that the particles are irregular in shape and the grain size tends to increase with the calcination temperature. (C) 2002 Kluwer Academic Publishers. C1 Univ La Habana, Fac Fis, IMRE, Havana 10400, Cuba. UNAM, Ctr Ciencias Mat Condensada, Ensenada 22800, Baja California, Mexico. RP Almodovar, NS, Univ La Habana, Fac Fis, IMRE, Havana 10400, Cuba. 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Mater. Sci. PD DEC 1 PY 2002 VL 37 IS 23 BP 5089 EP 5093 PG 5 SC Materials Science, Multidisciplinary GA 614QT UT ISI:000179201600017 ER PT J AU Dominguez, C Lopez, MVM Rios-Jara, D TI The influence of manganese on the microstructure and the strength of a ZA-27 alloy SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MECHANICAL-PROPERTIES; COMPOSITES; CU AB Mechanical properties and microstructures of the ZA-27 alloy with different contents of Mn are reported. Mn modifies the coarse foundry microstructure by forming Al-Mn precipitates and a fine lamellar alpha + beta microstructure. Additions of Mn increase the mechanical properties since coarse precipitates are avoided. Best results are obtained for the 0.25 to 0.30 weight% Mn range. (C) 2002 Kluwer Academic Publishers. C1 Ctr Invest Mat Avanzados, Chihuahua 31109, Mexico. RP Dominguez, C, Ctr Invest Mat Avanzados, Miguel de Cervantes 120,Complejo Ind Chihuahua, Chihuahua 31109, Mexico. CR *AS TECN ESP DES Z, 1985, TECH REP *COMINCO LTD, 1985, 11 COMINCO LTD BARNHURST RJ, 1983, AFS T, V91, P569 BARNHURST RJ, 1989, NORANDA TECHNOLOGY C BESS ML, 1983, DIE CASTING ENG DURMAN M, 1992, J MATER SCI, V27, P3215 DURMAN M, 1997, J MATER SCI, V32, P1603 GERVAIS E, 1985, JOM-J MIN MET MAT S, V37, P43 HANNA MD, 1994, P 3 INT C ZN AL ALL, P95 KUBEL EJ, 1987, ADV MAT P, V7 LECOMTEBECKERS J, 1994, P ADV SCI TECHN APPL, P101 LI BJ, 1996, METALL MATER TRANS A, V27, P809 LU JS, 1996, METALL MATER TRANS A, V27, P2565 MIHALCHUK W, 1984, DIE CASTING ENG JUL NEGRETE J, 1994, P ADV SCI TECHN APPL, P15 PRASAD BK, 1997, J MATER SCI, V32, P1169 PRASAD BK, 1997, SCRIPTA MATER, V37, P323 RACHEV P, 1991, ACTA METALL MATER, V39, P2177 SAMALHA K, 1994, P ADV SCI TECHN APPL, P23 SEAH KHW, 1996, MATER DESIGN, V17, P63 SHARMA SC, 1996, MATER DESIGN, V17, P245 SIRONA Y, 1996, J MATER SCI, V15, P1863 TANG NY, 1994, P ADV SCI TECHN APPL, P108 TJONG SC, 1997, METALL MATER TRANS A, V28, P1951 ZHU YH, 1993, J MAT RES, V8 NR 25 TC 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD DEC 1 PY 2002 VL 37 IS 23 BP 5123 EP 5127 PG 5 SC Materials Science, Multidisciplinary GA 614QT UT ISI:000179201600022 ER PT J AU Arce-Estrada, EM Lopez-Hirata, VM Martinez-Lopez, L Dorantes-Rosales, HJ Saucedo-Munoz, ML Hernandez-Santiago, F TI Electrocatalytic properties of mechanically alloyed Co-20wt%Ni-10wt%Mo and Co-70wt%Ni-10wt%Mo alloy powders SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ALKALINE WATER ELECTROLYSIS; HYDROGEN EVOLUTION; COBALT-MOLYBDENUM AB Mechanically alloyed Co-20wt%Ni-10wt%Mo and Co-70wt%Ni-10wt%Mo (nominal compositions) alloy powders were produced by milling of pure elemental powders. Mechanically alloyed powders were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. MA powder specimens were tested electrollitically in a 30% KOH aqueous solution at 298 K. X-ray diffraction analysis and transmission electron microscopy of milled powders showed the presence of two phases, an fcc solid solution and intermetallic compounds of Ni or Co with Mo. These phases showed a nanometric size. The linear sweep voltammograms confirmed also the presence of two phases in both mechanically alloyed alloy powders. The Co-20wt%Ni-10wt%Mo alloy powders showed the best electrocatalytic activity for hydrogen evolution reaction. (C) 2003 Kluwer Academic Publishers. C1 Inst Politecn Nacl ESIQIE, Mexico City 07300, DF, Mexico. RP Arce-Estrada, EM, Inst Politecn Nacl ESIQIE, Apartado Postal 75-876, Mexico City 07300, DF, Mexico. CR *ASM INT, 1992, ASM HDB, V3, P2 ARUL RI, 1990, J APPL ELECTROCHEM, V20, P32 ARUL RI, 1992, J APPL ELECTROCHEM, V22, P471 BROWN DE, 1984, ELECTROCHIM ACTA, V29, P1551 FAN CL, 1994, ELECTROCHIM ACTA, V39, P2715 FAN CL, 1994, J ELECTROCHEM SOC, V141, P382 HUANG KJ, 1995, CHINESE J CHEM ENG, V3, P1 JOVIC VD, 1988, J APPL ELECTROCHEM, V18, P511 NR 8 TC 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JAN 15 PY 2003 VL 38 IS 2 BP 275 EP 278 PG 4 SC Materials Science, Multidisciplinary GA 616PA UT ISI:000179311100012 ER PT J AU Clapp, M Hernandez-Linares, S Hernandez-Martinez, E TI Linking-preserving perturbations of symmetric functionals SO JOURNAL OF DIFFERENTIAL EQUATIONS LA English DT Article DE nonhomogeneous elliptic systems; nonhomogeneous boundary condition; critical points of nonsymmetric functionals ID BOUNDARY-VALUE-PROBLEMS; MOUNTAIN PASS THEOREM; CRITICAL-POINTS; MULTIPLICITY AB We consider paths of functionals starting with one which is invariant under the action of an arbitrary group of symmetries. We give conditions for the existence of an unbounded sequence of critical values of the non-symmetric functional at the end of the path in terms of the growth of the critical values of the symmetric one. We apply this to obtain a multiplicity result for a system of elliptic equations whose symmetries are perturbed by a linear term and a non-homogeneous boundary condition. (C) 2002 Elsevier Science (USA). C1 Univ Nacl Autonoma Mexico, Inst Matemat, Mexico City 04510, DF, Mexico. RP Clapp, M, Univ Nacl Autonoma Mexico, Inst Matemat, Circuito Exterior,Ciudad Univ, Mexico City 04510, DF, Mexico. CR BAHRI A, 1981, T AM MATH SOC, V276, P1 BAHRI A, 1988, COMMUN PUR APPL MATH, V41, P1027 BARTSCH T, 1991, J REINE ANGEW MATH, V419, P55 BOLLE P, 1999, J DIFFER EQUATIONS, V152, P274 BOLLE P, 2000, MANUSCRIPTA MATH, V101, P325 CANDELA AM, 1998, TOPOL METHODS NONLIN, V11, P1 CANDELA AM, 2002, NONLINEAR ANAL-THEOR, V51, P249 CLAPP M, 1996, COMMENT MATH HELV, V71, P570 CLAPP M, 2000, J LOND MATH SOC 3, V61, P950 CLAPP M, 2001, NONLINEAR ANAL TMA, V40, P3759 CLAPP M, 2002, PROG NONLIN, V49, P1 KRASNOSELSKII MA, 1964, TOPOLOGICAL METHODS RABINOWITZ P, 1982, T AM MATH SOC, V272, P753 RABINOWITZ PH, 1986, REGIONAL C SERIES MA, V65 SCHWARTZ L, 1992, ANALYSE, V2 STRUWE M, 1980, MANUSCRIPTA MATH, V32, P335 STRUWE M, 1990, VARIATIONAL METHODS TANAKA K, 1989, COMMUN PART DIFF EQ, V14, P99 WILLEM M, 1996, MINIMAX THEOREMS NR 19 TC 4 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0022-0396 J9 J DIFFERENTIAL EQUATIONS JI J. Differ. Equ. PD OCT 10 PY 2002 VL 185 IS 1 BP 181 EP 199 PG 19 SC Mathematics GA 615PL UT ISI:000179255200008 ER PT J AU Martinez, L Werner, A TI The exchange rate regime and the currency composition of corporate debt: the Mexican experience SO JOURNAL OF DEVELOPMENT ECONOMICS LA English DT Article DE exchange rate regimes; corporate debt; liability dollarization ID INVESTMENT AB This paper analyzes the effect that the change from a fixed to a floating exchange rate regime that took place in Mexico in December 1994 had on the currency composition of corporate debt. In particular, the paper asks whether a fixed exchange rate regime biases corporate borrowing towards foreign currency due to an implicit exchange rate guarantee given by the government. Therefore, under a predetermined regime, firms will not fully internalize their exchange rate risk and will be more likely to engage in balance sheet mismatches than under a floating regime. We study the main determinants of foreign currency borrowing of those firms listed in the Mexican Stock Exchange from 1992 to 2000 to test whether balance sheet currency mismatches fell after the adoption of the floating exchange rate regime. The results found support the view that the floating exchange rate regime has been useful in reducing exchange rate exposure. (C) 2002 Elsevier Science B.V All rights reserved. C1 Banco Mexico, Res Dept, Mexico City 06059, DF, Mexico. RP Werner, A, Banco Mexico, Res Dept, Avenida 5 Mayo 18,Piso 4,Col Ctr, Mexico City 06059, DF, Mexico. CR BABATZ G, 1997, THESIS HARVARD U CALVO G, 2000, 7993 NBER CALVO G, 2000, UNPUB FIXING YOUR LI DEVEREUX MP, 1990, INFORMATION CAPITAL EICHENGREEN B, 1999, 7418 NBER FISHER S, 2001, J EC PERSPECT, V15, P3 GELOS G, 1999, J DEV ECON, V67, P1 HARRIS JR, 1994, WORLD BANK ECON REV, V8, P17 HOLMSTROM B, 1997, Q J ECON, V112, P663 MISHKIN FS, 1996, 5600 NBER OLINER SD, 1992, REV ECON STAT, V74, P643 NR 11 TC 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3878 J9 J DEVELOP ECON JI J. Dev. Econ. PD DEC PY 2002 VL 69 IS 2 BP 315 EP 334 PG 20 SC Economics GA 616FX UT ISI:000179294400002 ER PT J AU Valdes-Martinez, J Hernandez-Ortega, S Hermetet, AK Ackerman, LJ Presto, CA Swearingen, JK Kelman, DR Goldberg, KI Kaminsky, W West, DX TI Structural studies of N-2-(3-picolyl)- and N-2-(4-picolyl)-N '-tolylthioureas SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY LA English DT Article DE thiourea; pyridine; hydrogen bonding ID THIOUREA AB Reactions of 2-aminopicolines with 2- and 4-tolyl isothiocyanates yielded N-2-(4-picolyl)-N'-4-tolylthiourea, 1, N-2-(3-picolyl)-N'-4-tolylthiourea, 2, and N-2-(4-picolyl)-N'-2-tolylthiourea, 3. Compound 1 is monoclinic, of space group P2(1)/c with a = 7.456(1) Angstrom, b = 13.135(3) Angstrom, c = 13.959(3) Angstrom, beta = 104.99(3)degrees, and V = 1320.5(5) Angstrom(3) with Z = 4, for d(calc) = 1.294 g/cm(3). Compound 2 is triclinic, of space group P (1) over bar 1 with a = 6.877(3) Angstrom, b = 7.590(5) Angstrom, c = 13.213(9)Angstrom, alpha = 78.38(2)degrees, beta = 77.96(4)degrees, gamma = 86.36(4)degrees, and V = 660.5(7)Angstrom(3) with Z = 2, for d(calc) = 1.294 g/cm(3). Compound 3 is monoclinic, of space group P2(1)/c with a = 12.604(2) Angstrom, b = 15.592(3) Angstrom, c = 6.875(2) Angstrom, beta = 91.05(2)degrees, and V = 1350.9(2) Angstrom(3) with Z = 4, for d(calc) = 1.265 g/cm(3). The three thioureas are found in both solid state and solution in a conformation resulting from intramolecular N-H ... N hydrogen bonding. Compounds 1 and 3 present an intermolecular hydrogen bond involving the thione sulfur and the NH hydrogen, which is not present in 2 owing to the steric hindrance of the methyl group in the phenyl ring. The geometry of the molecule is affected by the position of the methyl groups on the pyridine and aryl rings. C1 Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico. Illinois State Univ, Dept Chem, Normal, IL 61790 USA. Univ Washington, Dept Chem, Seattle, WA 98195 USA. RP Valdes-Martinez, J, Univ Nacl Autonoma Mexico, Inst Quim, Circuito Exterior,Ciudad Univ, Mexico City 04510, DF, Mexico. CR 1995, INT TABLES XRAY CRYS, C *SIEM AN XRAY INST, 1990, SIEM SHELXTL PC REL ETTER MC, 1991, J PHYS CHEM-US, V95, P4601 HERMETET AK, 2002, J CHEM CRYSTALLOGR, V32, P17 KASCHERES A, 1991, J HETEROCYCLIC CHEM, V28, P2057 MACKAY S, 1998, MAXUS COMPUTER PROGR MCBRIDE MT, 2001, CRYST GROWTH DES, V1, P39 SUDBECK EA, 1999, ACTA CRYSTALLOGR 12, V55, P2122 VALDESMARTINEZ J, 1999, J MOL STRUCT, V478, P219 VALDESMARTINEZ J, 2002, J MOL STRUCT, V608, P77 WASSMAIER D, 1995, ACTA CRYSTALLOGR A, V51, P416 WEST DX, 1999, ACTA CRYSTALLOGR C 5, V55, P811 WEST DX, 2000, J MOL STRUCT, V522, P27 NR 13 TC 3 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1074-1542 J9 J CHEM CRYSTALLOGRAPHY JI J. Chem. Crystallogr. PD NOV PY 2002 VL 32 IS 11 BP 431 EP 438 PG 8 SC Crystallography; Spectroscopy GA 616UX UT ISI:000179322700002 ER PT J AU Zuniga-Moreno, A Galicia-Luna, LA Horstmann, S Ihmels, C Fischer, K TI Compressed liquid densities and excess volumes for the binary systems carbon dioxide plus 1-propanol and carbon dioxide plus 2-propanol using a vibrating tube densimeter up to 25 MPa SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID 313.15 K; EQUILIBRIA; PRESSURES; MIXTURES AB The PupsilonT behavior was determined for the binary systems carbon dioxide + 1-propanol and carbon dioxide + 2-propanol in the homogeneous state. The measurements were performed for different compositions at temperatures ranging from 313 to 363 K and pressures up to 25 MPa using a vibrating tube densimeter. The accuracy of the density determinations was better than +/-0.05%, and the densities presented in this work agree well with data reported in the literature. The excess volumes were calculated from the experimental PupsilonT data. C1 Inst Politecn Nacl, ESIQIE, Graduados Lab Termodinam, Mexico City 07738, DF, Mexico. Univ Oldenburg, Lab Thermophys Properties GmbH, D-26111 Oldenburg, Germany. RP Galicia-Luna, LA, Inst Politecn Nacl, ESIQIE, Graduados Lab Termodinam, Edif Z,Secc 6,1er Piso,UPALM, Mexico City 07738, DF, Mexico. CR DELALLAVE R, 1999, DISCRET CONTIN DYN S, V5, P157 GALICIALUNA LA, UNPUB J CHEM ENG DAT GALICIALUNA LA, 1994, J CHEM ENG DATA, V39, P424 GALICIALUNA LA, 2000, J CHEM ENG DATA, V45, P265 HAAR L, 1981, THERMODYNAMIC SURFAC POHLER H, 1997, J CHEM ENG DATA, V42, P384 SILVAOLIVER G, IN PRESS FLUID PHASE SILVAOLIVER G, 2001, FLUID PHASE EQUILIBR, V182, P145 SPAN R, 1998, INT J THERMOPHYS, V19, P1121 STARLING RB, 1972, HYDROCARBON PROC MAY, P129 YAGINUMA R, 1997, J CHEM ENG DATA, V42, P814 YAGINUMA R, 1998, FLUID PHASE EQUILIBR, V144, P203 ZUNIGAMORENO A, IN PRESS ELDATA INT ZUNIGAMORENO A, 2002, J CHEM ENG DATA, V47, P149 ZUNIGAMORENO A, 2002, J CHEM ENG DATA, V47, P155 NR 15 TC 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD NOV-DEC PY 2002 VL 47 IS 6 BP 1418 EP 1424 PG 7 SC Chemistry, Multidisciplinary; Engineering, Chemical GA 617NV UT ISI:000179368500019 ER PT J AU Henaut, Y Alauzet, C Lambin, M TI Effects of starvation on the search path characteristics of Orius majusculus (Reuter) (Het., Anthocoridae) SO JOURNAL OF APPLIED ENTOMOLOGY-ZEITSCHRIFT FUR ANGEWANDTE ENTOMOLOGIE LA English DT Article ID HETEROPTERA; BEHAVIOR AB Orius majusculus (Reuter) is a polyphagous predator bug used to control western flower thrips Frankliniella occidentalis (Pergande). As physiological factors may be highly influential upon the predatory behaviour of Orius spp. we studied the possible impact of starvation on the search path of this bug. Orius majusculus was maintained on a diet of Ephestia kuehniella Zeller (Lep., Pyralidae) eggs in laboratory. Adults were collected immediately after the imaginal moult and were individually placed in Petri dishes with abundant food. Each adult was randomly assigned to one of the following five treatments: immediate observation or starved for 2, 6, 9 or 12 h prior to observation. The observation procedure consisted of placing a single O. majusculus adult at the centre of an empty arena. The displacement of each insect was recorded with a video camera until it had reached the limits of the arena. The recorded paths were digitized and the digitized search path was used to calculate the mean walking speed, the number of stops per second, the duration of stops and the diffusion rate. The results clearly show that, in comparison with unstarved bugs, insects that experienced 6 h of prey deprivation walked more slowly, stopped more frequently and for longer periods, and had a lower rate of diffusion away from the release point. In contrast, all search path variables returned to the levels measured in unstarved bugs in the group that experienced the longest period of starvation (12 h), whereas groups of O. majusculus that had experienced 2 or 9 h of prey deprivation presented intermediate values for all the variables tested. Starvation produced evident changes in the search path characteristics that we assume to be related to physiological states of hunger and energy availability. These behavioural changes related to physiological state could have consequences for the use of this pirate bug in biological control. C1 Univ Toulouse 3, UMR 5552, Lab Ecol Terr, F-31062 Toulouse, France. Univ Toulouse 3, Lab Neurobiol & Comportement, F-31062 Toulouse, France. Colegio Frontera Sur, Tapachula, Chiapas, Mexico. RP Henaut, Y, Carr Antiguo Aeropuerto Km 2-5,Apartado Postal 36, Tapachula 30700, Chiapas, Mexico. CR ALAUZET C, 1992, ENTOMOPHAGA, V37, P249 BELL WJ, 1991, SEARCHING BEHAV BEHA BOND AB, 1980, ANIM BEHAV, V28, P10 COCCUZA GE, 1997, ENTOMOL EXP APPL, V85, P189 ETTIFOURI M, 1992, ENTOMOLOGIA EXPT APP, V65, P101 FERRAN A, 1994, J INSECT BEHAV, V7, P633 FISHER S, 1992, REV SUISSE VITICULT, V24, P119 FRITSCHE ME, 2000, ENTOMOL EXP APPL, V96, P111 GRASSELLY D, 1994, THESIS U RECHERCHE HENAUT Y, 1999, ENTOMOL EXP APPL, V90, P103 HENAUT Y, 2000, J ECON ENTOMOL, V93, P252 JANDER R, 1975, ANNU REV ECOL SYST, V6, P171 MAISONNEUVE JC, 1993, B IOCB WPRS, V16, P105 SCHONE H, 1980, ORIENTIERUNG RAUM TROTTINCAUDAL Y, 1991, B OILB WPRS, V14, P50 NR 15 TC 1 PU BLACKWELL VERLAG GMBH PI BERLIN PA KURFURSTENDAMM 57, D-10707 BERLIN, GERMANY SN 0931-2048 J9 J APPL ENTOMOL JI J. Appl. Entomol.-Z. Angew. Entomol. PD NOV PY 2002 VL 126 IS 9 BP 501 EP 503 PG 3 SC Entomology GA 615HV UT ISI:000179240500010 ER PT J AU Cardador-Martinez, A Loarca-Pina, G Oomah, BD TI Antioxidant activity in common beans (Phaseolus vulgaris L.) SO JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY LA English DT Article DE phenolics; antioxidant activity; beta-carotene; DPPH; pearling; dry milling; beans ID DRY BEANS; PHENOLIC-COMPOUNDS; EXTRACT; HULLS; FLAVONOIDS; INHIBITORS; BUCKWHEAT; ASSAY; SEEDS; MEN AB Beans were pearled to evaluate the feasibility of increasing antioxidant activity and phenolic antioxidants. Phenolics were concentrated mostly in the hull fraction at about 56 mg of catechin equivalents per gram of sample. The methanolic extracts of the pearled bean samples were screened for antioxidant potential using the beta-carotene-linoleate and the 1,1-diphenyl-2-picrylhydrazyl (DPPH) in vitro model systems. The pearled material, also referred to as milled samples, exhibited antioxidant activity that correlated with phenolic content and inhibited DPPH significantly in a dose-dependent manner. Phenolics and antioxidant activities were also examined in chromatographic fractions of methanolic extracts of manually obtained hulls that represented a model used previously to ascertain antimutagenic activity. Fractions extracted with ethyl acetate/acetone and acetone displayed antioxidant activity, which implies potent free radical scavenging activity with antimutagenic activity. C1 Agr & Agri Food Canada, Pacific Agri Food Res Ctr, Natl Bioprod & Bioproc Program, Summerland, BC V0H 1Z0, Canada. Univ Autonoma Queretaro, Sch Chem, Res & Grad Studies Food Sci, PROPAC, Queretaro 76010, Qro, Mexico. RP Oomah, BD, Agr & Agri Food Canada, Pacific Agri Food Res Ctr, Natl Bioprod & Bioproc Program, Summerland, BC V0H 1Z0, Canada. 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Agric. Food Chem. PD NOV 20 PY 2002 VL 50 IS 24 BP 6975 EP 6980 PG 6 SC Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology GA 615UU UT ISI:000179266000007 ER PT J AU Dostal, J Caby, R Keppie, JD Maza, M TI Neoproterozoic magmatism in Southwestern Algeria (Sebkha el Melah inlier): a northerly extension of the Trans-Saharan orogen SO JOURNAL OF AFRICAN EARTH SCIENCES LA English DT Article DE neoproterozoic; orogenic belt; metavolcanic rocks ID ABITIBI GREENSTONE-BELT; OCEANIC ISLAND-ARC; CONVERGENT MARGIN; SUPERIOR-PROVINCE; VOLCANIC-ROCKS; GEOCHEMISTRY; CANADA; MANTLE; MALI; PETROGENESIS AB The Neoproterozoic Sebkha el Melah inlier is a part of the Pan-African Trans-Saharan orogenic belt that is exposed in northwestern Africa east of the West African craton. The inlier is composed of a 4-5 km thick sequence of fine-grained marine to fluvial elastic sedimentary rocks intercalated with, and conformably overlain by, mafic lava flows and proximal volcaniclastic deposits, 600-1000 m thick. The lava flows and associated minor intrusives are mainly shoshonites. Their geochemical characteristics are indicative of subduction-related magmas and are characterized by relative depletion of Nb, Ta and Ti with respect to rare-earth elements and Th. Their positive but highly variable epsilon(Nd) values (+1-+5) are interpreted to reflect contamination of mantle-derived mafic melts (similar to+6) by continental crust. It is suggested that the Sebkha el Melah shoshonitic rocks formed in a backarc or rifted arc setting. Their location, close to the Trans-Saharan suture, is interpreted to be the result of subduction erosion which removed the forearc and possibly also part of the arc. The shallow source (<60 km) for the Sebkha el Melah volcanic rocks is related to flat-slab subduction. Traced along strike to the south, the >620 Ma, Neoproterozoic volcanic suites of the Trans-Saharan belt change to typical continental, Andean margin catc-alkaline rocks in the northwestern Hoggar and an oceanic island arc complex in Mali. This may indicate that the rate of convergence of the West African craton and the Tuareg (Saharan) paleocontinent increased from south to north due to a change in the angle of convergence across the margin (oblique in the south to orthogonal in the north), resulting from the curve of the eastern margin of the West African craton that swings from N-S to NW-SE. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada. Univ Montpellier 2, Lab Tectonophys, F-34095 Montpellier 05, France. Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico. Univ Bejaia, Dept Geol, Bejaia 06000, Algeria. RP Dostal, J, St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada. 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Afr. Earth Sci. PD AUG PY 2002 VL 35 IS 2 BP 213 EP 225 PG 13 SC Geosciences, Multidisciplinary GA 616KB UT ISI:000179302000004 ER PT J AU Castelli, P Sosa, AL Campillo, C Nicolini, H Cruz-Fuentes, C TI Apolipoprotein E genotypes in a group of elderly subjects of Spanish descent living in Mexico City SO INTERNATIONAL PSYCHOGERIATRICS LA English DT Article DE dementia; Alzheimer's disease; apolipoprotein E; APOE; genotypes; Mexico ID FAMILIAL ALZHEIMERS-DISEASE; APOE-EPSILON-4 ALLELE; AFRICAN-AMERICANS; TYPE-4 ALLELE; FREQUENCY; RISK; AGE; HISPANICS; GENE; ASSOCIATION AB The association between the APOE gene and Alzheimer's disease and other forms of dementia has been widely documented, but its relevance as a genetic risk factor in specific ethnic groups other than Caucasians in the United States and Europe is limited. The aim of this work was to describe the distribution of the APOE genotype in 80 subjects of Spanish origin, over 60 years old, who were institutionalized in the Spanish Hospital of Mexico City. Thirty-eight subjects who met the DSM-IV and ICD-10 criteria for Alzheimer's disease or vascular dementia and 42 controls without dementia underwent genotyping. APOE C allele frequencies were as follows: for affected individuals, epsilon2, 7.9%, epsilon3, 69.7%, and epsilon4, 22.4%; for controls, epsilon2, 4.8%, epsilon3, 91.6%, and epsilon4, 3.6%. The higher frequency of the epsilon4 allele in the affected group (chi(2) = 14.5; df = 4, p =.006) confirms an association between this APOE molecular variant and dementia in elderly Spaniards. C1 Inst Nacl Psiquiatria Ramon Fuente, Subdirecc Invest Clin, Dept Genet Psiquiat, Mexico City 14370, DF, Mexico. Hosp Espanol, Mexico City, DF, Mexico. RP Cruz-Fuentes, C, Inst Nacl Psiquiatria Ramon Fuente, Subdirecc Invest Clin, Dept Genet Psiquiat, Calzada Mexico Xochimilco 101,San Lorenzo Huipulc, Mexico City 14370, DF, Mexico. CR *AM PSYCH ASS, 1994, DIAGN STAT MAN MENT *WHO, 1992, INT STAT CLASS DIS R ADROER R, 1995, NEUROSCI LETT, V189, P182 ALVAREZ V, 1999, MED CLIN-BARCELONA, V113, P441 ARBOLEDA GH, 2001, NEUROSCI LETT, V305, P135 BARKER W, 1998, JAMA-J AM MED ASSOC, V280, P1661 BEYER K, 1997, ANN NY ACAD SCI, V826, P452 BROUSSEAU T, 1994, NEUROLOGY, V44, P2420 CORDER EH, 1993, SCIENCE, V261, P921 FARRER LA, 1997, JAMA-J AM MED ASSOC, V278, P1349 GOATE A, 1991, NATURE, V349, P704 HARWOOD DG, 1999, NEUROLOGY, V52, P551 IBARRETA D, 1995, J NEUROL SCI, V134, P146 JACQUIER M, 2001, ARQ NEURO-PSIQUIAT, V59, P11 JORM AF, 1989, PSYCHOL MED, V19, P1015 KAWASAKI E, 1991, PCR PROTOCOLS GUIDE, P84 KINSELLA K, 2001, AGING WORLD 2001 US LEVYLAHAD E, 1995, SCIENCE, V269, P970 LOPEZ OL, 1998, EUR NEUROL, V39, P229 MAESTRE G, 1995, ANN NEUROL, V37, P254 MOLERO AE, 2001, NEUROSCI LETT, V307, P5 OSTROSKYSOLIS F, 1999, J INT NEUROPSYCH SOC, V5, P413 OSTROSKYSOLIS F, 2000, APPL NEUROPSYCHOL, V7, P25 PERICAKVANCE MA, 1991, AM J HUM GENET, V48, P1034 POORKAJ P, 1998, HUM MUTAT, V11, P216 REBECK GW, 1994, NEUROLOGY, V44, P1513 SAUNDERS AM, 1993, NEUROLOGY, V43, P1467 STRITTMATTER WJ, 1993, P NATL ACAD SCI USA, V90, P1977 TANG MX, 1998, JAMA-J AM MED ASSOC, V279, P751 VANDUIJN CM, 1991, LANCET, V337, P978 VANDUIJN CM, 1994, NAT GENET, V7, P74 WENHAM PR, 1991, LANCET, V337, P1158 ZANNIS VI, 1982, J LIPID RES, V23, P911 ZAUDIG M, 1991, PSYCHOL MED, V21, P225 NR 34 TC 1 PU SPRINGER PUBLISHING CO PI NEW YORK PA 536 BROADWAY, NEW YORK, NY 10012 USA SN 1041-6102 J9 INT PSYCHOGERIATR JI Int. Psychogeriatr. PD SEP PY 2002 VL 14 IS 3 BP 291 EP 300 PG 10 SC Psychology, Clinical; Geriatrics & Gerontology; Gerontology; Psychiatry; Psychiatry; Psychology GA 617TF UT ISI:000179376400006 ER PT J AU Dong, SH TI Unified method for dynamical groups of some anharmonic potentials SO INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS LA English DT Article DE algebraic method; anharmonic potential; factorization method ID MORSE-OSCILLATOR; COHERENT STATES; CONSTRUCTION; SCATTERING; ALGEBRAS; LADDER AB Realizations of the creation and annihilation operators for some important anharmonic potentials, such as the Morse potential, the modified Poschl-Teller potential (MPT), the pseudoharmonic oscillator, and infinitely deep square-well potential, are presented by a factorization method. It is shown that the operators for the Morse potential and the MPT potential satisfy the commutation relations of an SU(2) algebra, but those of the pseudoharmonic oscillator and the infinitely deep square-well potential constitute an SU(1, 1) algebra. The matrix elements of some related operators are analytically obtained. The harmonic limits of the SU(2) operators for the Morse and MPT potentials are studied as the Weyl algebra. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RP Dong, SH, Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, AP 70-543,Circuito Exterior,CU, Mexico City 04510, DF, Mexico. CR ALHASSID Y, 1983, ANN PHYS-NEW YORK, V148, P346 ARIMA A, 1976, ANN PHYS-NEW YORK, V99, P253 BALLHAUSEN CJ, 1988, CHEM PHYS LETT, V146, P449 BENEDICT MG, 1999, PHYS REV A, V60, R1737 BERCEANU S, 1987, J MATH PHYS, V28, P2899 BERRONDO M, 1980, J PHYS A, V13, P773 BESSIS N, 1994, PHYS REV A A, V50, P4506 BUYUKKILIC F, 1992, CHEM PHYS LETT, V194, P9 CHILD MS, 1984, ADV CHEM PHYS, V62, P1 COOPER IL, 1993, J PHYS A-MATH GEN, V26, P1601 ENGLEFIELD MJ, 1991, J PHYS A-MATH GEN, V24, P3557 FLUGGE S, 1971, PRACTICAL QUANTUM ME, P94 FRANK A, 1984, PHYS REV LETT, V52, P1737 FRANK A, 1994, ALGEBRAIC METHODS MO GERRY CC, 1986, PHYS REV A, V33, P2207 GOLDMAN II, 1960, PROBLEMS QUANTUM MEC, P8 GRADSHTEYN IS, 1994, TABLES INTEGRALS SER IACHELLO F, 1993, J CHEM PHYS, V99, P7337 IACHELLO F, 1995, ALGEBRAIC THEORY MOL INFELD L, 1951, REV MOD PHYS, V23, P21 JENSEN P, 2000, MOL PHYS, V98, P1253 KAIS S, 1990, PHYS REV A, V41, P2301 KONDO AE, 1988, J MATH PHYS, V29, P1396 LANDAU LD, 1977, QUANTUM MECH NONRELA, P72 MORSE PM, 1929, PHYS REV, V34, P57 NIETO MM, 1979, PHYS REV A, V19, P435 POPOV D, 2001, J PHYS A-MATH GEN, V34, P5283 POSCHL G, 1933, ZS PHYS, V83, P143 SAGE M, 1984, CHEM PHYS, V87, P431 TALMAN JD, 1968, MATH PHYSICS MONOGRA, P182 WANG ZX, 1989, SPECIAL FUNCTIONS, P276 WU J, 1990, J MATH PHYS, V31, P557 NR 32 TC 0 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0020-7748 J9 INT J THEOR PHYS JI Int. J. Theor. Phys. PD OCT PY 2002 VL 41 IS 10 BP 1991 EP 2011 PG 21 SC Physics, Multidisciplinary GA 614HH UT ISI:000179181900011 ER PT J AU Suarez, R Solis-Daun, J Alvarez-Ramirez, J TI Global robust stabilization of nonlinear systems subject to input constraints SO INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL LA English DT Article DE bounded control; global stabilization; control Lyapunov function; robust control; robust stability margin ID FEEDBACK; CONTROLLABILITY AB Our main purpose in this paper is to further address the global stabilization problem for affine systems by means of bounded feedback control functions, taking into account a large class of control value sets: p, r-weighted balls B-r(m) (p), with 1 < p less than or equal to infinity, defined via p, r-weighted gauge functions. Observe that p = infinity is allowed, so that m-dimensional r-hyperboxes B-r(m)(infinity) := [-r-(-)(1), r(1)(+)] x... x [-r(m)(-),r(m)(+)] r(j)(+/-) > 0 are also considered. Working along the line of Artstein-Sontag's approach, we construct an explicit formula for a one-parameterized family of continuous feedback controls taking values in B-r(m)(p) that globally asymptotically stabilize an affine system, provided an appropriate control Lyapunov function is known. The designed family of controls is suboptimal with respect to the robust stability margin for uncertain systems. The problem of achieving disturbance attenuation for persistent disturbances is also considered. Copyright (C) 2002 John Wiley Sons, Ltd. C1 Univ Autonoma Metropolitana Iztapalapa, Div Ciencias Basicas & Ingn, Mexico City 09340, DF, Mexico. RP Solis-Daun, J, Univ Autonoma Metropolitana Iztapalapa, Div Ciencias Basicas & Ingn, Apdo Postal 55-534, Mexico City 09340, DF, Mexico. CR ARSTEIN Z, 1983, NONLINEAR ANAL-THEOR, V7, P1163 BLANCHINI F, 2000, IEEE T AUTOMAT CONTR, V45, P1072 BRAATZ RP, 1994, IEEE T AUTOMAT CONTR, V39, P1000 FREEMAN RA, 1996, SIAM J CONTROL OPTIM, V34, P1365 JURDJEVIC V, 1978, J DIFFER EQUATIONS, V28, P381 LIBERZON D, 1999, P 38 IEEE C DEC CONT, P2501 LIN W, 1995, IEEE T AUTOMAT CONTR, V40, P776 LIN W, 1996, AUTOMATICA, V32, P915 LIN YD, 1991, SYST CONTROL LETT, V16, P393 LORIA A, 1997, IEEE T AUTOMAT CONTR, V42, P1138 MALISOFF M, 2000, SYSTEMS CONTROL LETT, V40, P246 MALISOFF MA, 2000, P AMER CONTR CONF, P1771 QU Z, 1998, ROBUST CONTROL NONLI ROCKAFELLAR RT, 1972, CONVEX ANAL SOLISDAUN J, 2000, SIAM J CONTROL OPTIM, V39, P682 SONTAG ED, 1983, SIAM J CONTROL OPTIM, V21, P462 SONTAG ED, 1989, SYST CONTROL LETT, V13, P117 NR 17 TC 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1049-8923 J9 INT J ROBUST NONLINEAR CONTR JI Int. J. Robust Nonlinear Control PD DEC 15 PY 2002 VL 12 IS 14 BP 1227 EP 1238 PG 12 SC Engineering, Electrical & Electronic; Mathematics, Applied; Automation & Control Systems GA 618BQ UT ISI:000179398600003 ER PT J AU Burger, AJ D'Elia, JA Weinrauch, LA Lerman, I Gaur, A TI Marked abnormalities in heart rate variability are associated with progressive deterioration of renal function in type I diabetic patients with overt nephropathy SO INTERNATIONAL JOURNAL OF CARDIOLOGY LA English DT Article DE heart rate variability; diabetes mellitus; nephropathy; autonomic neuropathy ID CARDIAC AUTONOMIC NEUROPATHY; URINARY ALBUMIN EXCRETION; BLOOD-PRESSURE; CARDIOVASCULAR-DISEASE; SPECTRAL-ANALYSIS; FOLLOW-UP; DYSFUNCTION; HYPERTENSION; MICROALBUMINURIA; PREVALENCE AB Background: Cardiac autonomic neuropathy is a common complication of long-standing, type I diabetes and is associated with increased morbidity and mortality. Impaired heart rate variability is a sensitive and reproducible marker of cardiac autonomic neuropathy. We sought to examine the relationship between cardiac autonomic neuropathy as assessed by heart rate variability and overt nephropathy, with emphasis on the progression of renal dysfunction over I year. Method: Baseline and 12 month clinical and biochemical characteristics, as well as autonomic function tests, were analyzed in 23, type I diabetic patients (mean age 37-10 years, 65% males), who were prospectively enrolled as a part of a multi-center investigation. In addition, ambulatory, 24-h, 3-channel electrocardiograms were recorded, and heart rate variability indices were assessed in the time and frequency domains over the same period. Results: All heart rate variability indices were markedly decreased in our study population. On univariate analysis, heart rate variability was associated with creatinine clearance, and to a lesser extent, mean 24-h blood pressures and cholesterol. On multivariate analysis, only heart rate variability was a significant and independent predictor of abnormalities in creatinine clearance. Severe reduction in heart rate variability at baseline was also significantly associated with the further deterioration in renal function at I year. Conclusion: Heart rate variability is significantly reduced in long-standing, type 1 diabetics with proteinuria or overt nephropathy. Marked abnormalities in heart rate variability are significantly associated with and predictive of progressive renal deterioration at 1 year. These findings may have implications for aggressive medical intervention to improve prognosis and survival in this population. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved. C1 Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA. Harvard Univ, Sch Med, Noninvas Cardiol Lab, Boston, MA 02215 USA. Inst Nacl Nutr Salvador Zubiran, Dept Endocrinol, Mexico City 14000, DF, Mexico. Mt Auburn Hosp, Boston, MA USA. Joslin Diabet Ctr, Boston, MA 02215 USA. RP Burger, AJ, Beth Israel Deaconess Med Ctr, 1 Deaconess Rd,Baker 3, Boston, MA 02215 USA. 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J. Cardiol. PD DEC PY 2002 VL 86 IS 2-3 BP 281 EP 287 PG 7 SC Cardiac & Cardiovascular Systems GA 617NE UT ISI:000179367100020 ER PT J AU Arghavani, J Derenne, A Marchand, L TI Prediction of gasket leakage rate and sealing performance through fuzzy logic SO INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY LA English DT Article DE fuzzy logic; gasket performance; gasketed flanged joints; leakage rate prediction; limited data points AB Leakage rate prediction and control are of the utmost importance in most industrial applications for gasketed flanged joints in high-pressure systems, for safety and environmental reasons. In addition, loss of media, and damage to the plant, resulting from leaky joints can be very costly for the industries. Gasket testing and the evaluation of their sealing performance are complex, time-consuming, and costly, and require sophisticated tools capable of predicting leakage based on limited data. In the present work, fuzzy logic is used as a tool to predict the leakage rate and gasket performance of gasketed flanged joints. Different fuzzy models are developed and validated with experimental results for given operating conditions, taking into consideration the gasket type and surface roughness of the mating faces. It is shown that limited experimental test data can be used to build fuzzy models that predict gasket leakage rate and sealing performance. C1 Ecole Polytech, Dept Mech Engn, Montreal, PQ H3C 3A7, Canada. RP Arghavani, J, Dept Mechatron & Automat, Tec Monterrey State Mexico Campus,Catteterra Lago, Mexico City 52926, DF, Mexico. CR ARGHAVANI J, 2001, INT J ADV MANUF TECH, V17, P2 ARGHAVANI J, 2001, INT J ADV MANUF TECH, V18, P67 ARGHAVANI J, 2002, IN PRESS INT J ADV M BALAZINSKI M, 1995, FUZZY FLOU DECISION PAYNE JR, 1994, DRAFT 9 STANDARD MET NR 5 TC 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL ROAD, GODALMING GU7 3DJ, SURREY, ENGLAND SN 0268-3768 J9 INT J ADV MANUF TECHNOL JI Int. J. Adv. Manuf. Technol. PY 2002 VL 20 IS 8 BP 612 EP 620 PG 9 SC Engineering, Manufacturing; Automation & Control Systems GA 617MK UT ISI:000179365300009 ER PT J AU Mendoza-Diaz, G Driessen, WL Reedijk, J Gorter, S Gasque, L Thompson, KR TI Synthesis, characterization and X-ray structures of the new dinucleating ligand 2,8-dimethyl-1,4,5,6,7,10,11,12-octahydroimidazo[4,5-h] imidazo[4,5-c][1,6]diazecine-5,11-diethanoic acid and its Cu(II) complex; an alternating chain of Cu(II) ions, coupled both intramolecularly and intermolecularly SO INORGANICA CHIMICA ACTA LA English DT Article DE dinuclear complexes; imidazole; diazecine ring; copper(II) complex ID CRYSTAL-STRUCTURE; HEXAHYDRATE AB The design and synthesis of a new, rigid dinucleating ligand 2,8-dimethyl-1,4,5,6,7,10,11,12-octahydroimidazo[4,5-h] imidazo[4,5-c][1,6]diazecine-5,11-diethanoic acid (H(2)glymeim) is reported together with its molecular and crystal structure. The rigid ligand structure is confirmed by the structure and magnetic properties of its his Cu(II) complex, [Cu-2(C16H22N6O6)(H2O)(4)](ClO4)(2)(H2O)(2), (Cu(2)glymeim). Crystals of free glymeim are composed of units Of C16H22N6O4 and eight water molecules linked by a two dimensional network of hydrogen bonds. Six of them contribute to a one-dimensional network that links the organic molecules. The 1,6-diazecine ring shows a chair conformation, with expected angles and bond distance values. A stretched conformation of the glycine residue is observed in the free ligand. When this residue is coordinated, it produces significant stress over the diazecine ring caused by the closure of the glycine residue around the metal ion. The copper complex has a dinuclear structure with a square pyramidal environment around both metal ions. The apical position in the two pyramids point to opposite directions in the molecule and they are related by an inversion center. The pyramidal bases of both copper atoms are in the same plane. The intramolecular metal-metal distance in the complex is 7.445(3) Angstrom. However, the shortest distance is of intermolecular nature, with a value of 5.378(2) Angstrom. The crystal structure of the complex consists of a chain of dinuclear units, with an alternating chain arrangement. Low temperature magnetic susceptibility and EPR are in agreement with an antiferromagnetic dinuclear behavior in solution and like a linear chain uniformly spaced, with J = -8.54 cm(-1) and alpha = 1. The magnetic behavior of this compound can be explained as the result of an intramolecular magnetic exchange (long distance), and a superexchange path through the hydrogen bond network between adjacent dinuclear molecules. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Guanajuato, Fac Quim, Guanajuato 36050, Mexico. Leiden Univ, Leiden Inst Chem, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands. Univ Nacl Autonoma Mexico, Fac Quim, Mexico City 04510, DF, Mexico. RP Mendoza-Diaz, G, Univ Guanajuato, Fac Quim, Noria Alta S-N, Guanajuato 36050, Mexico. CR 1974, INT TABLES XRAY CRYS, V4 BAUMANN GC, 1984, INORG CHEM, V23, P3104 BERNDT DC, 1970, J ORG CHEM, V35, P1129 BOUWMAN E, 1990, COORDIN CHEM REV, V104, P143 COFFMAN RE, 1979, J PHYS CHEM-US, V83, P2387 CREMER D, 1975, J AM CHEM SOC, V97, P1354 GEUE RJ, 1994, J CHEM SOC CHEM COMM, P1513 HALL JW, 1981, INORG CHEM, V20, P1033 HALL SR, 1992, XTAL32 PROGRAM HAY PJ, 1975, J AM CHEM SOC, V97, P4884 KARUNAKARAN S, 1994, J CHEM SOC DA, P1595 MENDOZADIAZ G, 1996, ACTA CRYSTALLOGR C 4, V52, P960 MUSCI G, 1999, J BIOL INORG CHEM, V4, P441 PALYULIN VA, 1981, J MOL STRUCT, V70, P65 RICHARDSON JS, 1975, P NATL ACAD SCI USA, V72, P1349 SOLOMON EI, 1983, PURE APPL CHEM, V55, P1069 SPEK AL, 1990, ACTA CRYSTALLOGR A, V46, C34 SPEK AL, 1992, PLUTON 92 SPEK AL, 1993, PLATON 93 STOCKER FB, 1970, J ORG CHEM, V35, P883 TEO SB, 1993, J COORD CHEM, V29, P57 NR 21 TC 7 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD NOV 15 PY 2002 VL 339 BP 51 EP 59 PG 9 SC Chemistry, Inorganic & Nuclear GA 616BD UT ISI:000179281100008 ER PT J AU Ferrari, R Bernes, S de Barbarin, CR Mendoza-Diaz, G Gasque, L TI Interaction between Glyglu and Ca2+, Pb2+, Cd2+ and Zn2+ in solid state and aqueous solution. Crystal structures of poly[aqua-1,2-kappa-O-di[lead(glygluH)]bis(perchlorate)] and poly[bisglycylglutamic-cadmium(II) tetrahydrate] SO INORGANICA CHIMICA ACTA LA English DT Article DE glycylglutamic acid; cations; spectroscopy; equilibrium; structures ID CALCIUM-BINDING PROTEIN; CD-113 NMR; DIETARY CALCIUM; COMPLEXES; CADMIUM(II); COORDINATION; RATS; CALBINDIN-D9K; COOPERATIVITY; DYNAMICS AB Glycylglutamic acid (GEH(2)) is a peptide usually present in calcium binding sites. The interaction between the peptide and the cations Ca2+ Pb2+, Cd2+, and Zn in aqueous solution and in the solid state is described. Six compounds were isolated with different protonation states of the ligand. Potentiometric equilibrium studies, C-13 and Cd-111 solid state CP MAS NMR and IR spectroscopy were performed. Two crystal structures are reported: [Pb(GEH)(H2O)](1/2)]ClO4 and [Cd(GEH)(2)].3H(2)O. Both constitute 3D polymers, where only carboxylate groups are coordinated to the cations. The crystalline lead compound shows a hemidirected coordination sphere due to its stereochemically active lone pair. In deprotonated derivatives, it is possible to assign a metal-amino interaction to a far IR signal (340-370 cm(-1)). (C) 2002 Elsevier Science B.V. All rights reserved. C1 Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan, Mexico City 04510, DF, Mexico. Univ Autonoma Puebla, Inst Ciencias B, Ctr Quim, Puebla, Mexico. Univ Autonoma Nuevo Leon, Fac Ciencias Quim, Monterrey, Nuevo Leon, Mexico. Univ Guanajuato, Fac Quim, Guanajuato 36050, Mexico. RP Gasque, L, Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan, Ciudad Univ, Mexico City 04510, DF, Mexico. 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Chim. Acta PD NOV 15 PY 2002 VL 339 BP 193 EP 201 PG 9 SC Chemistry, Inorganic & Nuclear GA 616BD UT ISI:000179281100024 ER PT J AU Grevy, JM Tellez, F Bernes, S Noth, H Contreras, R Barba-Behrens, N TI Coordination compounds of thiabendazole with main group and transition metal ions SO INORGANICA CHIMICA ACTA LA English DT Article DE alkaline metal; lead; transition metal; coordination compounds; thiabendazole ID RAY CRYSTAL-STRUCTURES; LEWIS-BASE ADDUCTS; X-RAY; SPECTROSCOPIC CHARACTERIZATION; LEAD(II) COMPOUNDS; SOLID-STATE; SODIUM; COMPLEXES; 2-GUANIDINOBENZIMIDAZOLE; CHEMISTRY AB We report Li-I, Na-I, K-I, Pb-II, Co-II, Ni-II, Cu-II, Zn-II, Cd-II and Hg-II coordination compounds derived from thiabendazole [2-(4'-thiazolyl)benzimidazole (tbz)]. The compounds were characterised by analytical and spectroscopic techniques. NMR studies of diamagnetic compounds were performed in solution. X-ray diffraction analysis of Na-I, Pb-II, Co-II, Ni-II, Cu-II and Cd-II complexes showed that tbz stabilises bis- and tris-chelated coordination compounds. In solution and in solid state the ligand coordinates to the metal ions through the imidazolic and thiazole nitrogen atoms regardless of the nature of the metal ion. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. Univ Autonoma Estado Morelos, Ctr Invest Quim, Cuernavaca 62000, Morelos, Mexico. UAP, IC, Ctr Quim, Puebla 72000, Mexico. Univ Munich, Dept Inorgan Chem, D-81377 Munich, Germany. Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Inorgan, Mexico City 04510, DF, Mexico. RP Contreras, R, Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, AP 14-740, Mexico City 07000, DF, Mexico. 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Chim. Acta PD NOV 15 PY 2002 VL 339 BP 532 EP 542 PG 11 SC Chemistry, Inorganic & Nuclear GA 616BD UT ISI:000179281100064 ER PT J AU Dutta, PR Cappello, R Navarro-Garcia, F Nataro, JP TI Functional comparison of serine protease autotransporters of Enterobacteriaceae SO INFECTION AND IMMUNITY LA English DT Article ID ENTEROAGGREGATIVE ESCHERICHIA-COLI; SHIGELLA-FLEXNERI; ENTEROTOXIN; TOXIN; PROTEINS; PET; SECRETION; STRAIN; SEPA; ESPC AB The plasmid-encoded toxin (Pet) of enteroaggregative Escherichia coli (EAEC) belongs to a family of high-molecular-weight serine protease autotransporters of Enterobacteriaceae (SPATEs) which also includes Pic from EAEC and Shigella flexneri, EspC from enteropathogenic E. coli, EspP from enterohemorrhagic E. coli, Sat from uropathogenic E. coli, Tsh from avian pathogenic E. coli, and SepA from S. flexneri. Phylogenetic analysis shows the SPATE proteins to represent a distinct subfamily of autotransporters with amino acid identities ranging from 35 to 55%, providing a powerful resource to direct structure-function studies. In this study, we show that these related proteins are proteases with divergent substrate specificities, suggesting different functions. The cleavage profile of oligopeptides was found to be unique for each SPATE protein. The SPATEs showed proteolytic activity for several substrates, namely mucin, pepsin, human coagulation factor V, and erythroid spectrin. The cleavage of spectrin has been hypothesized as the mechanism through which Pet induces cytopathic effects. However, whereas Pet, Sat, and EspC cleaved spectrin, only Pet and Sat elicited cytopathic effects; the remaining SPATEs did not cause any morphological changes to HEp-2 cell monolayers. EspC and Pet exhibited acid-dissociable binding to HEp-2 cells. However, Pet was more efficient at entering HEp-2 cells, suggesting a basis for the different abilities of these two proteases to damage cells. Our data suggest that, despite the homologies observed among these proteins, the SPATEs have different pathogenetic functions only partly dependent on their substrate specificities. C1 Univ Maryland, Sch Med, Ctr Vaccine Dev, Baltimore, MD 21201 USA. IPN, CICATA, Program Mol Biomed, Mexico City 07738, DF, Mexico. IPN, CINVESTAV, Dept Cell Biol, Mexico City 07738, DF, Mexico. RP Nataro, JP, Univ Maryland, Sch Med, Ctr Vaccine Dev, HSF 480,685 W Baltimore St, Baltimore, MD 21201 USA. 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Immun. PD DEC PY 2002 VL 70 IS 12 BP 7105 EP 7113 PG 9 SC Immunology; Infectious Diseases GA 617TU UT ISI:000179377600074 ER PT J AU Sira-Ramirez, H TI Dynamic second-order sliding mode control of the hovercraft vessel SO IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY LA English DT Article DE flat systems; hovercraft; second-order sliding; trajectory planning ID NONLINEAR-SYSTEMS; FLATNESS AB In this paper, a suitable combination of the differential flatness property and the second-order sliding mode controller design technique is proposed for the specification of a robust dynamic feedback multivariable controller accomplishing prescribed trajectory tracking tasks for the earth coordinate position variables of a hovercraft vessel model. C1 Univ Los Andes, Dept Sistemas Control, Merida, Venezuela. RP Sira-Ramirez, H, IPN, CINVESTAV, Dept Ingn Elect, Secc Mecatron, Mexico City 07300, DF, Mexico. CR BARTOLINI G, 1996, IEEE T AUTOMAT CONTR, V41, P1220 BARTOLINI G, 1999, LECT NOTES CONTR INF, V247, P329 EMELYANOV SV, 1986, SOV PHYS DOKL, V31, P291 EMELYANOV SV, 1990, TILES THEORY VARIABL FANTONI I, 2000, INT J ROBUST NONLINE, V10 FLIESS M, 1995, INT J CONTROL, V61, P1327 FLIESS M, 1999, IEEE T AUTOMAT CONTR, V44, P922 FOSSEN TI, 1994, GUIDANCE CONTROL OCE FRIDMAN L, 1996, LECT NOTES CONTROL I, V217, P107 GODHAVN JM, 1996, P 35 IEEE C DEC CONT, P987 LEVANT A, P EUR CONTR C ECC 97 LEVANT A, 1993, INT J CONTROL, V58, P1247 PETTERSEN KY, P 1997 AM CONTR C PETTERSEN KY, P 1998 IFAC S NONL C PETTERSEN KY, 1996, P 35 IEEE C DEC CONT, P967 PETTERSEN KY, 1998, P IFAC C SYST STRUCT, P59 REYHANOGLU M, P 35 IEEE C DEC CONT, P2371 SIRARAMIREZ H, P 37 IEEE C DEC CONT SIRARAMIREZ H, 2000, DYNAM CONTROL, V10, P151 UTKIN VI, 1977, SLIDING MODES THEIR NR 20 TC 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1063-6536 J9 IEEE TRANS CONTROL SYST TECHN JI IEEE Trans. Control Syst. Technol. PD NOV PY 2002 VL 10 IS 6 BP 860 EP 865 PG 6 SC Engineering, Electrical & Electronic; Automation & Control Systems GA 617CD UT ISI:000179341900009 ER PT J AU Cervantes, I Kelly, R Alvarez-Ramirez, J Moreno, J TI A robust velocity field control SO IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY LA English DT Article DE integral control; semiglobal stability; uncertain robot dynamics; velocity field control (VFC) ID DIRECT-DRIVE ROBOT; MECHANICAL MANIPULATORS AB This paper is devoted to velocity field control (VFC) of uncertain robotic manipulators. We propose a proportional-integral (PI)-type controller derived from modeling error compensation ideas and singular perturbation theory, that requires a minimum knowledge of the plant (i.e., constant estimate of the inertia matrix). It is shown that semiglobal practical stabilization is achieved; that is, given any compact set of initial velocity field errors, there exist PI control gains which guarantee that the robot tracks a desired velocity field with arbitrary accuracy. The proposed controller was experimentally evaluated on a two degrees-of-freedom arm. C1 Inst Politecn Nacl, SEPI, ESIME Culhuacan, Mexico City 04430, DF, Mexico. CICESE, Div Fis Aplicada, Ensenada 22800, Baja California, Mexico. Univ Autonoma Metropolitana Iztapalapa, Div Ciencias Basicas & Ingn, Mexico City 09340, DF, Mexico. RP Cervantes, I, Inst Politecn Nacl, SEPI, ESIME Culhuacan, Col San Francisco Culhuacan, Mexico City 04430, DF, Mexico. CR ALAZARD D, 1999, INT J ROBUST NONLIN, V9, P101 ALVAREZRAMIREZ J, 1999, INT J ROBUST NONLIN, V9, P361 HOPPENSTEADT F, 1974, J DIFFER EQUATIONS, V15, P510 KRSTIC M, 1995, NONLINEAR ADAPTIVE C LI J, 2000, P JUSAFA ANN ARB MI LI PY, 1995, P IEEE INT C ROB AUT, P2764 LI PY, 1998, P AM CONTR C PHIL PA LI PY, 1999, IEEE T ROBOTIC AUTOM, V15, P751 LI PY, 1999, P AM CONTR C SAN DIE, P4543 REYES F, 1997, ROBOTICA 5, V15, P563 REYES F, 2001, MECHATRONICS, V11, P267 SCIAVICCO L, 1996, MODELING CONTROL ROB SPONG MW, 1989, ROBOT DYNAMICS CONTR YAMAKITA M, 1997, P IEEE INT C INT ROB, V1, P11 YAMAMOTO Y, 1998, ADV ASYMMETR SYNTH, V3, P1 NR 15 TC 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 USA SN 1063-6536 J9 IEEE TRANS CONTROL SYST TECHN JI IEEE Trans. Control Syst. Technol. PD NOV PY 2002 VL 10 IS 6 BP 888 EP 894 PG 7 SC Engineering, Electrical & Electronic; Automation & Control Systems GA 617CD UT ISI:000179341900013 ER PT J AU Gonzalez-Herrera, R Sanchez-y-Pinto, I Gamboa-Vargas, J TI Groundwater-flow modeling in the Yucatan karstic aquifer, Mexico SO HYDROGEOLOGY JOURNAL LA English DT Article DE groundwater flow; hydraulic properties of aquifers; karst; numerical modeling; Yucatan ID IMPACT CRATER; CHICXULUB CRATER; CENOTES AB The current conceptual model of the unconfined karstic aquifer in the Yucatan Peninsula, Mexico, is that a fresh-water lens floats above denser saline water that penetrates more than 40 km inland. The transmissivity of the aquifer is very high so the hydraulic gradient is very low, ranging from 7-10 mm/km through most of the northern part of the peninsula. The computer modeling program AQUIFER was used to investigate the regional groundwater flow in the aquifer. The karstified zone was modeled using the assumption that it acts hydraulically similar to a granular, porous medium. As part of the calibration, the following hypotheses were tested: (1) karstic features play an important role in the groundwater-flow system; (2) a ring or belt of sinkholes in the area is a manifestation of a zone of high transmissivity that facilitates the channeling of groundwater toward the Gulf of Mexico; and (3) the geologic features in the southern part of Yucatan influence the groundwater-flow system. The model shows that the Sierrita de Ticul fault, in the southwestern part of the study area, acts as a flow barrier and head values decline toward the northeast. The modeling also shows that the regional flow-system dynamics have not been altered despite the large number of pumping wells because the volume of water pumped is small compared with the volume of recharge, and the well-developed karst system of the region has a very high hydraulic conductivity. C1 Autonomous Univ Yucatan, Engn Sch, Cordemex 97111, Merida Yucatan, Mexico. RP Gonzalez-Herrera, R, Autonomous Univ Yucatan, Engn Sch, POB 150,Urban Mail Adm 150, Cordemex 97111, Merida Yucatan, Mexico. 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J. PD OCT PY 2002 VL 10 IS 5 BP 539 EP 552 PG 14 SC Geosciences, Multidisciplinary; Water Resources GA 616KH UT ISI:000179302600003 ER PT J AU Escobar-Briones, E Alcocer, J TI Caecidotea williamsi (Crustacea : Isopoda : Asellidae), a new species from a saline crater-lake in the eastern Mexican Plateau SO HYDROBIOLOGIA LA English DT Article DE Alchichica; benthic; cryptic; maars; Mexico; Oriental Basin; Peracarida; tropical lake; tufa ID FAUNA AB A new species of Caecidotea, an aquatic isopod crustacean is described from Alchichica crater-lake in the state of Puebla, Oriental Basin, central Mexico. This is the first report of an epigean asellid isopod, with cryptic behavior inhabiting inland saline waters in America. Comparisons made with other co-occurring asellid species in the region show that the species Caecidotea pasquinii differs from the new species in lacking eyes, having different features on the male endopod of pleopod 2, a shorter pereiopod 6, and having elongated uropods. The epigean species Caecidotea communis differs from the new species in having pleopod 4 of the A type pattern of Lewis & Bowman (1981) and 5-8 retinacula on pleopod 1 sympod. C1 Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Unidad Acad Sistemas Oceanog & Costeros, Mexico City 04510, DF, Mexico. UNAM, UIICSE FES Iztacala, Environm Conservat & Improvement Project, Limnol Lab, Tlalnepantla 54090, Mexico. RP Escobar-Briones, E, Univ Nacl Autonoma Mexico, Inst Ciencias Mar & Limnol, Unidad Acad Sistemas Oceanog & Costeros, AP 70-305 Ciudad Univ, Mexico City 04510, DF, Mexico. 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A total of 43 species of marine algae were determined, which are recorded for the first time for the area of study. The families with best representation are: Gracilariaceae and Cladophoraceae, each with 5 species; and Corallinaceae, Rhodomelaceae, and Ulvaceae, each with 3. The highest diversity was found in autumn, the lowest in summer. The sites with the low diversity were Piedras del Burro with 7 species and El Tornillal with 18. These places are broad beaches, composed of sand and with few pebbles. The higher diversity was found at Punta Gorda with 34 species and Piedras de La Salina with 26. These localities are characterized by relatively stable rocky substrates, with some intertidal pools. The most common species regardless to distribution and occurrence over time were: Spyridia filamentosa, Dictyota flabellata, Struveopsis robusta, Cladophora microcladioides and Enteromorpha linza. Rosenvingea antillarum and Cladophora vagabunda represent new records for the Gulf of California. Nine epiphytic species were identified, which were frequently observed on Gelidium crinale, Spyridia filamentosa and Dictyota flabellata. C1 Univ Autonoma Baja California, Inst Invest Oceanol, Ensenada 22800, Baja California, Mexico. Univ Autonoma Baja California, Fac Ciencias Marinas, Ensenada 22800, Baja California, Mexico. Escuela Nacl Ciencias Biol, Inst Politecn Nacl, Carpio Plan De Ayala 11340, DF, Mexico. RP Aguilar-Rosas, LE, Univ Autonoma Baja California, Inst Invest Oceanol, Apdo Postal 453, Ensenada 22800, Baja California, Mexico. 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Trimethylsilylaminodiphenylphosphanes Ph2PN(R)SiMe3 (R = Bu (1), Ph (2), 2-pyridyl (3), 2-pyrimidyl (4), Me3Si (5)), amino(chloro)phenylphosphanes Ph(Cl)PNRR' (R = BZ, R' = Me (6), R = Bz, R' = Bu-t (7), R = Et, R' = Ph (8)), amino(chloro)tert-butylphosphanes Bu-t(Cl)PNRR' (R = R' = Pr-i (9), R = Me, R' = Bu-t (10), R = Bz, R' = Bu-t (11), R = H, R' = Bu-t (12), R = Et, R' = Ph (13), R = Pr-i; R' = Ph (14), R = Bu, R' = Ph (15), R = Bz, R' = Ph (16), R = R' = Ph (17), R = R' = Me3Si (18)), 3-tert-butyl-2-chloro-1,3,2-oxazaphospholane (19), and benzyl(tert-butyl)aminodichlorophosphane (20) were studied by H-1, C-13, N-15, Si-29, and P-31 NMR spectroscopy. In all cases, the more bulky, substituent at the nitrogen atom prefers the syn-position with respect to the assumed orientation of the phosphorus lone pair of electrons. Many of the derivatives studied adopt this preferred conformation even at room temperature. Numerous signs of coupling constants (1)J(P-31, N-15), (2)J(P-31, C-13), (2)J(P-31, and, Si-29) were determined. Low temperature NMR spectra were measured for derivatives for which rotation about the P-N bond at room temperature is fast, showing the presence of two rotamers at low temperature. The respective conformation of these rotamers could be assigned by C-13, N-15, and P-31 NMR spectroscopy. Isotope-induced chemical shifts (1)Delta N-15/14 (P-31) were determined for all compounds at natural abundance of N-15 by using Hahn-echo extended polarization transfer experiments. The molecular structure of 11 in the solid state reveals pyramidal surroundings of the nitrogen atom and mutual trans-positions of the tert-butyl groups at phosphorus and nitrogen. (C) 2002 Wiley Periodicals, Inc. C1 Univ Bayreuth, Anorgan Chem Lab, D-95440 Bayreuth, Germany. Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico. Univ Autonoma Estado Morelos, Ctr Invest Quim, Cuernavaca 62000, Morelos, Mexico. RP Wrackmeyer, B, Univ Bayreuth, Anorgan Chem Lab, Postfach 101251, D-95440 Bayreuth, Germany. 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PY 2002 VL 13 IS 7 BP 667 EP 676 PG 10 SC Chemistry, Multidisciplinary GA 616CM UT ISI:000179284200013 ER PT J AU Motamayor, JC Risterucci, AM Lopez, PA Ortiz, CF Moreno, A Lanaud, C TI Cacao domestication I: the origin of the cacao cultivated by the Mayas SO HEREDITY LA English DT Article DE Theobroma cacao L.; Criollo; genetic diversity; domestication; RFLP; microsatellites ID THEOBROMA-CACAO; GENETIC DIVERSITY; LINKAGE MAP; RFLP; MARKERS; VARIABILITY; VULGARIS; MEXICO; RAPD; DNA AB Criollo cacao (Theobroma cacao ssp. cacao) was cultivated by the Mayas over 1500 years ago. It has been suggested that Criollo cacao originated in Central America and that it evolved independently from the cacao populations in the Amazon basin. Cacao populations from the Amazon basin are included in the second morphogeographic group: Forastero, and assigned to T. cacao ssp. sphaerocarpum. To gain further insight into the origin and genetic basis of Criollo cacao from Central America, RFLP and microsatellite analyses were performed on a sample that avoided mixing pure Criollo individuals with individuals classified as Criollo but which might have been introgressed with Forastero genes. We distinguished these two types of individuals as Ancient and Modern Criollo. In contrast to previous studies, Ancient Criollo individuals formerly classified as 'wild', were found to form a closely related group together with Ancient Criollo individuals from South America. The Ancient Criollo trees were also closer to Colombian-Ecuadorian Forastero individuals than these Colombian-Ecuadorian trees were to other South American Forastero individuals. RFLP and microsatellite analyses revealed a high level of homozygosity and significantly low genetic diversity within the Ancient Criollo group. The results suggest that the Ancient Criollo individuals represent the original Criollo group. The results also implies that this group does not represent a separate subspecies and that it probably originated from a few individuals in South America that may have been spread by man within Central America. C1 CIRAD, F-34398 Montpellier 5, France. INIFAP, Huimanguillo, Tabasco, Mexico. Colegio Postgrad, Huimanguillo, Tabasco, Mexico. FONAIAP, Estac Expt Miranda, Caucagua, Edo Miranda, Venezuela. RP Motamayor, JC, ARS, USDA, 13601 Old Cutler Rd, Miami, FL 33158 USA. 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ALB messanger was detected in PWBC by RT-nPCR in control individuals (C), patients with liver cirrhosis (LC) and LC+AH. A higher number of LC+AH patients were positive to ALB mRNA (67%), compared to C (30%) and LC (28%). COP was decreased in LC and LC+AH groups compared to C group. No statistically significant changes were detected in eta in the different populations studied. Most of the LC+AH patients positive to peripheral ALB expression (87%) had a fatal outcome, compared to survivors (25%). Such difference was not observed with the conventional liver function tests or Maddrey's discriminant function. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Civil Hosp Guadalajara Fray Antonio Alcalde, Dept Mol Biol Med, Guadalajara 44280, Jalisco, Mexico. Civil Hosp Guadalajara Fray Antonio Alcalde, Dept Gastroenterol, Guadalajara 44280, Jalisco, Mexico. Univ Guadalajara, Hlth Sci Ctr, Dept Physiol, Inst Chron Degenerat Dis, Guadalajara 44430, Jalisco, Mexico. Social Secur Hexican Inst, Med Ctr W Mexico, Guadalajara, Jalisco, Mexico. RP Panduro, A, Civil Hosp Guadalajara Fray Antonio Alcalde, Dept Mol Biol Med, POB 2-500, Guadalajara 44280, Jalisco, Mexico. 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Res. PD NOV PY 2002 VL 24 IS 3 BP 265 EP 274 PG 10 SC Gastroenterology & Hepatology GA 616BM UT ISI:000179281900007 ER PT J AU Cerecedo, D Stock, R Gonzalez, S Reyes, E Mondragon, R TI Modification of actin, myosin and tubulin distribution during cytoplasmic granule movements associated with platelet adhesion SO HAEMATOLOGICA LA English DT Article DE adhesion to glass; cytoskeleton; filopodia; granule migration; lamellipodia; platelets ID HUMAN-BLOOD PLATELETS; ACTIVATED PLATELETS; SHAPE CHANGE; CYTOSKELETAL REORGANIZATION; ADHERENT PLATELETS; MICROTUBULE COILS; BINDING PROTEIN; ALPHA-ACTININ; SURFACE; FILAMENTS AB Background and Objectives. Cytoskeletal elements determine the changes in platelet cell shape which occur during adhesion, aggregation and release of granular contents as part of the activation process. The aim of this study was to characterize the changes in the distribution of actin filaments, myosin and tubulin molecules during several stages of platelet adhesion to glass and their association with granule displacement, as assessed by confocal microscopy. Design and Methods. Platelets obtained from healthy donors were adhered to glass and cytoskeleton distribution was characterized and correlated to changes of cell shape and intracellular granule displacement by immunofluorescence assays and phase contrast microscopy. Treatment with specific cytoskeleton inhibitors such as cytochalasin D, butanedione monoxime and colchicine were used before and after the adhesion process. The spatial distribution of the cytoskeleton in association with cytoplasmic granules was analyzed in both confocal microscopy projections and three-dimensional images obtained by merging the respective projections. Results. Our experiments revealed that as platelets contact the substrate, 6 sequential and simultaneous rearrangement of actin filaments, myosin and tubulin molecules occurred and this was related to cell shape, as well as to movements of cytoplasmic granules. Treatment of platelets with cytoskeleton inhibitors, modified not only the target molecule but also other cytoskeletal components with consequent alterations in the studied platelet functions. Interpretation and Conclusions. During platelet adhesion to glass and granule displacement, a close spatial and functional relation between actin filaments, myosin molecules and microtubules was observed suggesting that these different cytoskeleton components interact in supporting the platelet functions here studied. (C) 2002, Ferrata Storti Foundation. C1 IPN, Ctr Invest & Estudios Avanzados, Dept Bioquim, Mexico City 07360, DF, Mexico. IPN, Ctr Invest & Estudios Avanzados, Unidad Microscopia Elect, Mexico City, DF, Mexico. UNAM, Inst Biotecnol, Cuernavaca, Morelos, Mexico. IPN, Escuela Nacl Ciencias Biol, Dept Morfol, Mexico City, DF, Mexico. RP Mondragon, R, IPN, Ctr Invest & Estudios Avanzados, Dept Bioquim, Av Inst Politecn Nacl 2508, Mexico City 07360, DF, Mexico. CR ADAMS GA, 1981, AM J PHYSIOL, V240, H99 ALLEN RD, 1979, J CELL BIOL, V83, P126 BAUMGARTNER HR, 1972, ANN NY ACAD SCI, V201, P22 BEARER EL, 1995, CELL MOTIL CYTOSKEL, V30, P50 BEARER EL, 2000, CELL MOTIL CYTOSKEL, V47, P351 BEHNKE O, 1967, J ULTRASTUC RES, V19, P147 BOOYSE FM, 1971, J BIOL CHEM, V246, P4291 BOOYSE FM, 1973, J BIOL CHEM, V248, P4083 BOYLES J, 1985, J CELL BIOL, V101, P1463 CARROLL RC, 1982, CELL, V30, P385 CASELLA JF, 1981, NATURE, V293, P302 DEBUS E, 1981, EUR J CELL BIOL, V24, P45 ERETH MH, 2001, J CARDIOTHOR VASC AN, V15, P49 ESCOLAR G, 1986, AM J PATHOL, V123, P86 ESCOLAR G, 1991, BLOOD VESSELS, V28, P520 EUTENEUER U, 1998, J CELL SCI 3, V111, P405 FOX JEB, 1981, NATURE, V292, P650 FOX JEB, 1982, J BIOL CHEM, V257, P4120 FOX JEB, 1984, J CELL BIOL, V98, P1985 GEORGE JN, 1972, BLOOD, V40, P862 GRUNKEMEIER JM, 1998, J BIOMED MATER RES, V41, P657 HAGMANN J, 1993, P NATL ACAD SCI USA, V90, P3280 HARRIS HE, 1978, FEBS LETT, V90, P84 HARTWIG JH, 1979, J MOL BIOL, V134, P539 HARTWIG JH, 1991, J CELL BIOL, V112, P407 HARTWIG JH, 1992, J CELL BIOL, V118, P1431 JENKINS CSP, 1984, J LAB CLIN MED, V104, P563 KENNEY DM, 1985, J CELL SCI, V78, P1 KENNEY DM, 1988, J BIOL CHEM, V263, P1432 KOVACSOVICS TJ, 1996, BLOOD, V87, P618 LEFEBVRE P, 1993, EUR J CELL BIOL, V62, P194 LEWIS JC, 1982, EXP MOL PATHOL, V37, P370 LEWIS JC, 1983, CELL MOTIL CYTOSKEL, V3, P589 LOFTUS JC, 1984, J CELL BIOL, V98, P2019 MATTSON JC, 1981, ANN NY ACAD SCI, V370, P11 MAY KM, 1998, CELL MOTIL CYTOSKEL, V41, P117 MCPHERSON VJ, 1974, BLOOD, V44, P411 NACHMIAS VT, 1983, SEMIN HEMATOL, V20, P261 NACHMIAS VT, 1991, CELL MOTIL CYTOSKEL, V20, P190 NAKATA T, 1987, J CELL BIOL, V105, P1771 NIEDERMAN R, 1975, J CELL BIOL, V67, P72 ODDE DJ, 1999, J CELL SCI, V112, P3283 PAINTER RG, 1984, EXP CELL RES, V155, P198 PARK K, 1990, BIOMATERIALS, V11, P24 ROSENBERG S, 1981, J CELL BIOL, V91, P201 SAGNELLA S, 2001, J BIOMED MATER RES, V57, P419 SIXMA JJ, 1989, EUR J CELL BIOL, V48, P271 SMALL JV, 1999, CURR OPIN CELL BIOL, V11, P54 SNEDDON JM, 1971, J PHYSIOL-LONDON, V214, P145 STARK F, 1991, J CELL BIOL, V112, P903 TAKUBO T, 1998, BIOTECH HISTOCHEM, V73, P310 TANAKA K, 1984, J ULTRA MOL STRUCT R, V89, P98 TANAKA K, 1998, J STRUCT BIOL, V124, P13 URWYLER N, 2000, CELL BIOL INT, V24, P863 WHICHER SJ, 1978, J BIOMED MATER RES, V12, P181 WHITE JG, 1968, BLOOD, V32, P638 WHITE JG, 1983, AM J PATHOL, V110, P55 WHITE JG, 1983, AM J PATHOL, V112, P207 WHITE JG, 1984, AM J PATHOL, V117, P207 WHITE JG, 1984, BLOOD, V64, P470 WHITE JG, 1985, BLOOD, V65, P1494 WHITE JG, 1986, BLOOD, V67, P873 WHITE JG, 1998, AM J PATHOL, V152, P597 XU Z, 1988, J ULTRASTR MOL STRUC, V99, P244 ZOBEL CR, 1983, EUR J CELL BIOL, V30, P83 ZOBEL CR, 1984, J ULTRASTRUCT RES, V589, P89 NR 66 TC 5 PU FERRATA STORTI FOUNDATION PI PAVIA PA STRADA NUOVA 134, 27100 PAVIA, ITALY SN 0390-6078 J9 HAEMATOLOGICA JI Haematologica PD NOV PY 2002 VL 87 IS 11 BP 1165 EP 1176 PG 12 SC Hematology GA 616KD UT ISI:000179302200011 ER PT J AU Bellini, M TI Baryogenesis in fresh inflation SO GENERAL RELATIVITY AND GRAVITATION LA English DT Article DE inflationary cosmology; scalar field ID WARM INFLATION; TEMPERATURE; ASYMMETRY; UNIVERSE AB I study the possibility of baryogenesis can take place in fresh inflation. I find that it is possible that violation of baryon number conservation can occur during the period out-of-equilibrium in this scenario. Indeed, baryogenesis could be possible in the range of times(10(9) - 10(12)) G(1/2), before the thermal equilibrium is restored at the end of fresh inflation. C1 Univ Michoacana San Nicolas Hidalgo, Inst Fis & Matemat, Morelia 58041, Michoacan, Mexico. RP Bellini, M, Univ Michoacana San Nicolas Hidalgo, Inst Fis & Matemat, AP 2-82, Morelia 58041, Michoacan, Mexico. CR ABBOTT LF, 1982, PHYS LETT B, V117, P29 AFFLECK I, 1985, NUCL PHYS B, V249, P361 BELLINI M, 1996, PHYS REV D, V54, P7172 BELLINI M, 2001, PHYS REV D, V63 BELLINI M, 2001, PHYS REV D, V64 BERERA A, 1998, PHYS REV D, V58 DOLGOV AD, 1982, PHYS LETT B, V116, P329 GUTH AH, 1981, PHYS REV D, V23, P347 KOFMAN L, 1994, PHYS REV LETT, V73, P3195 KOFMAN L, 1997, PHYS REV D, V56, P3258 KOLB EW, 1996, PHYS REV LETT, V77, P4290 LINDE AD, 1990, PARTICLE PHYSICS INF MAIA JMF, 1999, PHYS REV D, V60 MASIERO A, 1981, PHYS LETT B, V103, P343 PARK HS, 1985, PHYS REV LETT, V54, P22 RIOTTO A, 1999, ANNU REV NUCL PART S, V49, P35 SHAFI Q, 1984, PHYS REV LETT, V52, P691 STEINHARDT P, 1984, PHYS REV D, V10, P2162 STEINHARDT PJ, 1984, PHYS REV D, V29, P2162 WEINBERG S, 1974, PHYS REV D, V9, P3357 YOKOYAMA J, 1999, PHYS REV D, V60 NR 21 TC 1 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0001-7701 J9 GEN RELATIV GRAVIT JI Gen. Relativ. Gravit. PD DEC PY 2002 VL 34 IS 12 BP 2127 EP 2134 PG 8 SC Physics, Multidisciplinary GA 616NN UT ISI:000179310000010 ER PT J AU Maldonado, LCT Piedra, AL Mendoza, NM Valencia, AM Martinez, AM Larios, HM TI Expression profiles of Dax1, Dmrt1, and Sox9 during temperature sex determination in gonads of the sea turtle Lepidochelys olivacea SO GENERAL AND COMPARATIVE ENDOCRINOLOGY LA English DT Article DE temperature sex-determination (TSD); Dmrt1; Dax1; Sox9 ID AMERICAN ALLIGATOR; CHICKEN-EMBRYO; GENE; DIFFERENTIATION; MOUSE; GONADOGENESIS; CONSERVATION; EVOLUTION; SEQUENCE; SYNTENY AB Sex determination is controlled either by genetic or environmental factors. In mammals Sry initiates determination but no homologue of this gene exists in non-mammalian species. Other genes of the mammalian sex-determining, pathway have been identified in gonads of different vertebrates. Sox9, Dax1, and Dmrt1 are expressed at the onset of gonadal development in birds and reptiles. In the sea turtle Lepidochelys olivacea. a species with temperature sex determination (TSD). is expressed in undifferentiated gonads at male- (MPT) or female-promoting temperatures (FPT), At MPT, Sox9 remains expressed in male gonads, but at FPT it is downregulated coinciding with the onset of the ovarian morphologic differentiation and female sex determination. At MPT however, male sex is determined early than at FPT in still undifferentiated gonads suggesting that other genes maintain Sox9 expression in testis. Here we used RT-PCR to study the expression profiles of Dax1, Dmrt1 and Sox9 in gonads of embryos of L. olivacea incubated at MPT or at FPT. The profiles were correlated with sex determination during and after the temperature-sensitive period (TSP). Dax1 maintained similar levels at both temperatures during the TSP. The Dax1 expression level increased significantly in ovaries compared to testes at stage 27, once they were morphologically distinct. The expression levels of Dmrt1 were higher at MPT than at FPT at all stages, in contrast with Sox9 levels which were similar at both temperatures at Stages 23 25. Together, current results suggest that, whereas Dax1 is not involved in TSD in L. olivacea. upregulation of Dmrt1 and downregulation of Sox9 may play a role in male and female sex determination, respectively. (C) 2002 Elsevier Science (USA). All rights reserved. C1 UNAM, Inst Invest Biomed, Dept Cell Biol & Phisiol, Mexico City 04510, DF, Mexico. UNAM, Fac Med, Dept Microbiol & Parasitol, Mexico City 04510, DF, Mexico. RP Larios, HM, UNAM, Inst Invest Biomed, Dept Cell Biol & Phisiol, Ciudad Univ,Apartado Postal 70228, Mexico City 04510, DF, Mexico. CR BULL JJ, 1980, Q REV BIOL, V55, P3 ERDMAN SE, 1993, EMBO J, V12, P527 GUO WW, 1996, GENE, V178, P31 KENT J, 1996, DEVELOPMENT, V122, P2813 KETTLEWELL JR, 2000, GENESIS, V26, P174 KOOPMAN P, 1991, NATURE, V351, P117 KOST TA, 1983, NUCLEIC ACIDS RES, V11, P8287 KUMAR S, 1993, MEGA MOL EVOLUTIONAR, P130 MERCHANTLARIOS H, 1997, GEN COMP ENDOCR, V107, P373 MILLER JD, 1985, BIOL REPTILIA, V14, P270 MORAISDASILVA S, 1996, NAT GENET, V14, P62 MORENOMENDOZA N, 1999, J EXP ZOOL, V284, P705 MORENOMENDOZA N, 2001, DEV BIOL, V229, P319 NANDA I, 1999, NAT GENET, V21, P258 PASK A, 1997, GENOMICS, V41, P422 RAYMOND CS, 1998, NATURE, V391, P691 RAYMOND CS, 1999, DEV BIOL, V215, P208 RAYMOND CS, 2000, GENE DEV, V14, P2587 SAMBROOK J, 2001, MOL CLONING LAB MANU SINCLAIR AH, 1990, NATURE, V346, P240 SMITH CA, 1999, GENE, V234, P395 SMITH CA, 1999, NATURE, V402, P601 SMITH CA, 2001, J EXP ZOOL, V290, P691 SPOTILA LD, 1998, J EXP ZOOL, V281, P417 SWAIN A, 1996, NAT GENET, V12, P404 SWAIN A, 1998, NATURE, V391, P761 TORRESMALDONADO L, 2001, J EXP ZOOL, V290, P498 WESTERN PS, 1999, DEV DYNAM, V216, P411 WESTERN PS, 2000, GENE, V241, P223 YU RN, 1998, MOL ENDOCRINOL, V12, P1010 ZANARIA E, 1994, NATURE, V372, P635 NR 31 TC 6 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0016-6480 J9 GEN COMP ENDOCRINOL JI Gen. Comp. Endocrinol. PD OCT 15 PY 2002 VL 129 IS 1 BP 20 EP 26 PG 7 SC Endocrinology & Metabolism GA 616CP UT ISI:000179284400003 ER PT J AU Carrion, G Rico-Gray, V TI Mycoparasites on the coffee rust in Mexico SO FUNGAL DIVERSITY LA English DT Article DE coffee rust; Hemileia vastatrix; Hyphomycetous anamorphs; mycoparasites ID FUSARIUM-PALLIDOROSEUM; VERTICILLIUM-LECANII AB We surveyed coffee plantations for mycoparasites of the coffee rust (Hemileia vastatrix) in central Veracruz, Mexico. We report the presence in natural conditions of six mycoparasites. Five are reported for the first time (Acremonium byssoides, Calcarisporium arbuscula, C ovalisporum, Sporothrix guttuliformis, Fusarium pallidoroserum) as mycoparasites of H. vastatrix, the other species, Verticillium lecanii, had been previously reported. C1 Inst Ecol, Dept Hongos, AC, Xalapa 91070, Veracruz, Mexico. Inst Ecol, Dept Ecol Vegetal, AC, Xalapa 91070, Veracruz, Mexico. RP Carrion, G, Inst Ecol, Dept Hongos, AC, Apdo 63, Xalapa 91070, Veracruz, Mexico. CR ALARCON R, 1994, FITOPATOLOGIA, V29, P82 BOOTH C, 1971, GENUS FUSARIUM BOOTH C, 1984, T BRIT MYCOL SOC, V83, P702 CARRION G, 1988, MICOLOGIA NEOTROPICA, V1, P79 CARRION G, 1988, REV MEXICANA MICOLOG, V4, P317 CARRION G, 1999, FITOPATOLOGIA, V34, P214 DEHOOG GS, 1974, STUD MYCOL BAARN, V7, P1 DEHOOG GS, 1978, PERSOONIA, V10, P33 GAMS W, 1971, CEPHALOSPORIUMARTIGE GAMS W, 1975, T BRIT MYCOL SOC, V64, P389 HAWKSWORTH DL, 1976, CMI DESCRIPTIONS PAT, V502 HAWKSWORTH DL, 1995, AINSWORTH BISBYS DIC HEATH MC, 1987, EVOLUTIONARY BIOL FU, P149 HIJWEGEN T, 1988, NETHERLANDS J PLANT, V94, P185 HIJWEGEN T, 1992, NETH J PLANT PATHOL, V98, P77 HIJWEGEN T, 1993, 10BC WPRS B, V16, P76 HIJWEGEN T, 1993, NETH J PLANT PATHOL, V99, P103 HOCH HC, 1979, MYCOLOGIA, V71, P621 ISAAC S, 1992, FUNGAL PLANT INTERAC LIM TK, 1983, PERTANIKA, V6, P23 MABBAYAD MO, 2000, BIOCONTROL SCI TECHN, V10, P255 MANOCHA MS, 1994, HOST WALL ALTERATION, P81 MATSUSHIMA T, 1995, MATSUSHIMA MYCOLOGIC ROMBACH MC, 1987, MYCOLOGIA, V79, P153 ROMERO A, 1995, FITOPATOLOGIA, V30, P34 RUIZ RFC, 1988, REV JARDIN BOT NACL, V9, P89 SAMSON RA, 1988, ATLAS ENTOMOPATHOGEN SCHIEBER E, 1984, COFFEE RUST AM, P1 SIDDIQI MA, 1964, T BRIT MYCOLOGICAL S, V47, P281 SPENCER DM, 1980, T BRIT MYCOLOGICAL S, V74, P191 SPENCER DM, 1981, T BRIT MYCOLOGICAL S, V77, P535 STEYAERT RL, 1930, BR B SOC ROYALE BOT, V63, P46 THOMPSON JN, 1982, INTERACTION COEVOLUT THOMPSON JN, 1994, COEVOLUTIONARY PROCE VERHAAR MA, 1998, BIOCONTROL SCI TECHN, V8, P465 NR 35 TC 4 PU FUNGAL DIVERSITY PRESS PI YUNNAN PA YUNNAN UNIV, KUNMING, YUNNAN, PEOPLES R CHINA SN 1560-2745 J9 FUNGAL DIVERS JI Fungal Divers. PD OCT PY 2002 VL 11 BP 49 EP 60 PG 12 SC Mycology GA 617GU UT ISI:000179354500003 ER PT J AU Chacon, S TI Taxonomic notes on the genus Endoxylina (Diatrypales, Ascomycotina) and description of a new species from Mexico SO FUNGAL DIVERSITY LA English DT Article DE Endoxylina; Mexico; new species AB Endoxylina tehuacanensis is proposed as a new species in the Diatrypales (Ascomycotina). The specimens were collected upon fallen branches of Acacia constricta (Leguminosae) in the southeastern part of the state of Puebla, Tehuacan valley, Mexico. A description and illustrations of the morphological characters of this new species are provided. Moreover a brief review all species belonging to Endoxylina is presented. C1 Inst Ecol AC, Xalapa 91000, Veracruz, Mexico. RP Chacon, S, Inst Ecol AC, Apartado Postal 63, Xalapa 91000, Veracruz, Mexico. CR BARR ME, 1993, MYCOTAXON, V46, P45 ELLIS JB, 1892, N AM PYRENOMYCETES HAWKSWORTH DL, 1995, AINSWORTH BISBYS DIC JU YM, 1996, MYCOTAXON, V58, P419 KIRSCHSTEIN W, 1935, ANN MYCOL, V33, P202 MHASKAR DN, 1972, BOTANIQUE NAGPUR, V3, P69 MULLER E, 1962, BEITR KRYPTOGAMENFL, V11, P1 MULLER E, 1962, SYDOWIA, V15, P84 RAPPAZ F, 1987, MYCOL HELVETICA, V2, P285 ROMELL L, 1892, BOT NOTICER, P170 SAWADA K, 1959, SPECIAL B NATL TAIWA, V8, P1 SHOEMAKER RA, 1982, FUNGI CANADIENSIS, P227 SIVANESAN A, 1977, T BRIT MYCOL SOC, V69, P117 WEHMEYER LE, 1975, MYCOLOGIA MEMOIR, V6, P1 NR 14 TC 0 PU FUNGAL DIVERSITY PRESS PI YUNNAN PA YUNNAN UNIV, KUNMING, YUNNAN, PEOPLES R CHINA SN 1560-2745 J9 FUNGAL DIVERS JI Fungal Divers. PD OCT PY 2002 VL 11 BP 61 EP 68 PG 8 SC Mycology GA 617GU UT ISI:000179354500004 ER PT J AU Heredia, G Arias, RM Reyes, M Castaneda-Ruiz, C TI New anamorph fungi with rhombic conidia from Mexican tropical forest litter SO FUNGAL DIVERSITY LA English DT Article DE anamorphic fungi; hyphomycetes; litter fungi; Mexican mycobiota AB Two anamorph fungi, collected on leaf litter from Mexico are proposed as new taxa. One of them, Beltraniella fertilis, is characterized by having branched conidiophores with fertile apices. The other species, Pseudobeltrania macrospora, is characterized by having much longer conidia than all known species of Pseudobeltrania. Descriptions and illustrations in situ are provided, as well as culture characteristics. A key to the species of the genus Pseudobeltrania is included. C1 Inst Ecol AC, Xalapa 91070, Veracruz, Mexico. Inst Invest Fundamentales Agr Trop Alejandro Humb, Havana 10800, Cuba. RP Heredia, G, Inst Ecol AC, Km 2-5,Carretera Antigua Xalapa Coatepec,Congrega, Xalapa 91070, Veracruz, Mexico. CR BHAT DJ, 1985, T BRIT MYCOL SOC, V85, P107 CASTANEDARUIZ RF, 1996, MYCOTAXON, V58, P243 DEHOOG GS, 1977, STUDIES MYCOLOGY, V15, P199 HENNINGS P, 1902, HEDWIGIA, V412, P310 HEREDIA G, 1994, ACTA BOT MEXICANA, V27, P15 HEREDIA G, 1998, MYCOTAXON, V68, P137 HEREDIA G, 2000, ACTA BOT MEXICANA, V51, P39 HOLUBOVAJECHOVA V, 1987, CESK MYKOL, V41, P29 MATSUSHIMA T, 1975, ICONES MICROFUNGORUM MATSUSHIMA T, 1981, MATSUSHIMA MYCOLOGIC MATSUSHIMA T, 1995, MATSUSHIMA MYCOLOGIC PIROZYNSKI KA, 1963, MYCOL PAP, V90, P1 PIROZYNSKI KA, 1970, CAN J BOT, V48, P567 PIROZYNSKI KA, 1972, MYCOL PAP, V129, P1 SUTTON BC, 1970, T BRIT MYCOLOGICAL S, V55, P504 ZUCCONI L, 1991, MYCOLOGICAL RES, V95, P1017 NR 16 TC 0 PU FUNGAL DIVERSITY PRESS PI YUNNAN PA YUNNAN UNIV, KUNMING, YUNNAN, PEOPLES R CHINA SN 1560-2745 J9 FUNGAL DIVERS JI Fungal Divers. PD OCT PY 2002 VL 11 BP 99 EP 107 PG 9 SC Mycology GA 617GU UT ISI:000179354500007 ER PT J AU Duran-Valencia, C Galicia-Luna, LA Richon, D TI Phase equilibrium data for the binary system N,N-dimethylformamide plus ethylene and plus ethane at several temperatures up to 18 MPa SO FLUID PHASE EQUILIBRIA LA English DT Article DE vapor-liquid equilibria; liquid-liquid equilibria; equation-of-state; N,N-dimethylformamide; ethane; ethylene ID ISOTHERMAL FLASH PROBLEM; VAPOR-LIQUID-EQUILIBRIA; APPARATUS; STATE AB The ethylene (C2H4)-NN-dimethylformamide (DMF) binary system at 293.25, 303.05 and 323.05 K and pressures up to 18 MPa presents only a vapor-liquid equilibrium (VLE) behavior. The ethane (C2H6)-NN-dimethylformamide binary system behaves quite differently. In fact this latter displays not only a vapor-liquid equilibrium (VLE) behavior but also liquid-liquid equilibrium (LLE) and vapor-liquid-liquid equilibrium (VLLE) behaviors. The ethane-NN-dimethylformamide binary system has been studied at 264.45, 278.55, 293.15 and 313.35 K up to 18MPa. Both systems are correlated using the Peng-Robinson equation-of-state with Wong-Sandler mixing rules. A stability test based on the tangent plan criterion, as described by Michelsen, is carried out during the flash calculations made on the ethane-NN-dimethylformamide binary system. (C) 2002 Elsevier Science B.V. All rights reserved. C1 Ecole Natl Super Mines, Lab Thermodynam, Ctr Energet, F-77305 Fontainebleau, France. Inst Politecn Nacl, ESIQIE, Lab Termodinam Grad, Mexico City 07738, DF, Mexico. RP Richon, D, Inst Mexicano Petr, Eje Cent Lazaro Cardenas 152, Mexico City 07730, DF, Mexico. CR GAUTAM R, 1979, AICHE J, V25, P991 LAUGIER S, 1986, REV SCI INSTRUM, V57, P469 LAUGIER S, 1990, FLUID PHASE EQUILIBR, V54, P19 MICHELSEN ML, 1982, FLUID PHASE EQUILIBR, V9, P1 MICHELSEN ML, 1982, FLUID PHASE EQUILIBR, V9, P21 PENG D, 1976, IND ENG CHEM FUND, V15, P59 SCOTT RL, 1970, DISCUSS FARADAY SOC, P87 VANKONYNENBURG PH, 1968, THESIS U CALIFORNIA VANKONYNENBURG PH, 1980, PHILOS T R SOC LON A, V298, P495 WONG DSH, 1992, AICHE J, V38, P671 NR 10 TC 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBRIA JI Fluid Phase Equilib. PD DEC 1 PY 2002 VL 203 IS 1-2 BP 295 EP 307 PG 13 SC Chemistry, Physical; Engineering, Chemical; Thermodynamics GA 617GQ UT ISI:000179354100019 ER PT J AU Baldovin, F Robledo, A TI Sensitivity to initial conditions at bifurcations in one-dimensional nonlinear maps: Rigorous nonextensive solutions SO EUROPHYSICS LETTERS LA English DT Article ID POWER-LAW SENSITIVITY; THERMODYNAMICS; INTERMITTENCY; FRACTALITY AB Using the Feigenbaum renormalization group (RG) transformation we work out exactly the dynamics and the sensitivity to initial conditions for unimodal maps of nonlinearity zeta > 1 at both their pitchfork and tangent bifurcations. These functions have the form of q-exponentials as proposed in Tsallis' generalization of statistical mechanics. We determine the q-indices that characterize these universality classes and perform for the first time the calculation of the q-generalized Lyapunov coefficient lambda(q). The pitchfork and the left-hand side of the tangent bifurcations display weak insensitivity to initial conditions, while the right-hand side of the tangent bifurcations presents a "super-strong" (faster than exponential) sensitivity to initial conditions. We corroborate our analytical results with a priori numerical calculations. C1 Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico. RP Baldovin, F, Ctr Brasileiro Pesquisas Fis, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, Brazil. CR ANANIA G, 1988, EUROPHYS LETT, V7, P119 BALDOVIN F, CONDMAT0203595 BECK C, 1993, THERMODYNAMICS CHAOT, P164 BUIATTI M, 1999, PHYS REV LETT, V82, P3383 COSTA UMS, 1997, PHYS REV E A, V56, P245 CURADO EMF, 1991, J PHYS A, V24, P3187 CURADO EMF, 1991, J PHYS A, V24, L69 CURADO EMF, 1992, J PHYS A-MATH GEN, V25, P1019 DEMOURA FABF, 2000, PHYS REV E A, V62, P6361 FEIGENBAUM MJ, 1979, J STAT PHYS, V21, P669 GASPARD P, 1988, P NATL ACAD SCI USA, V85, P4591 GRASSBERGER P, 1981, J STAT PHYS, V26, P697 HATA H, 1989, PROG THEOR PHYS, V82, P897 HIRSCH JE, 1982, PHYS LETT A, V87, P391 HU B, 1982, PHYS REV LETT, V48, P1645 LYRA ML, 1998, PHYS REV LETT, V80, P53 OTT E, 1993, CHAOS DYNAMICAL SYST ROBLEDO A, CONDMAT0202095 SCHNEIDER T, 1987, Z PHYS B CON MAT, V66, P469 SCHUSTER HG, 1988, DETERMINISTIC CHAOS TSALLIS C, 1988, J STAT PHYS, V52, P479 TSALLIS C, 1997, CHAOS SOLITON FRACT, V8, P885 TSALLIS C, 2001, LECT NOTE PHYS, V560, P3 NR 23 TC 36 PU E D P SCIENCES PI LES ULIS CEDEXA PA 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD NOV PY 2002 VL 60 IS 4 BP 518 EP 524 PG 7 SC Physics, Multidisciplinary GA 614BZ UT ISI:000179169600005 ER PT J AU Caleyo, F Baudin, T Penelle, R TI Study of the development of the cube texture in Fe-50%Ni during recrystallization and normal grain growth SO EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS LA English DT Article ID ORIENTATION DISTRIBUTION FUNCTION; POLE FIGURES; SIMULATION; BOUNDARIES; DIFFRACTION; DEFORMATION; MECHANISM AB The development of the cube texture has been investigated in a Fe-50% Ni alloy undergoing recrystallization and normal grain growth by means of orientation imaging microscopy (OIM(TM))(b) and bulk texture measurements (X-ray diffraction). It is shown that both the oriented nucleation and the oriented growth mechanisms are responsible for the strengthening of the cube texture in the early stages of recrystallization in this alloy. The increase in the cube texture in the intermediate stages of recrystallization is mainly related to the high differentials in stored energy associated with cube grains. These experimental results are corroborated by way of a Monte-Carlo simulation of recrystallization based on data derived by OIM of the investigated alloy at its earliest recrystallization stages. The primary mechanism responsible for the development of the cube texture during grain growth relies on the preferential migration of the high-angle grain boundaries linked to cube grains which results from the advantage in number and size shown by cube grains when recrystallization is complete. C1 IPN, ESIQIE, Dept Ingn Met, Labs Pesados Met, Mexico City 07738, DF, Mexico. Univ Paris 11, Lab Physicochim Etat Solide, CNRS, UMR 8648, F-91405 Orsay, France. RP Caleyo, F, IPN, ESIQIE, Dept Ingn Met, Labs Pesados Met, UPALM Edif 7, Mexico City 07738, DF, Mexico. 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Phys. J.-Appl. Phys PD NOV PY 2002 VL 20 IS 2 BP 77 EP 89 PG 13 SC Physics, Applied GA 614BY UT ISI:000179169500001 ER PT J AU Tovar, AR Gomez, E Bourges, H Ortiz, V Kraus, A Torres, N TI Biochemical deficiency of pyridoxine does not affect interieukin-2 production of lymphocytes from patients with Sjogren's syndrome SO EUROPEAN JOURNAL OF CLINICAL NUTRITION LA English DT Article DE pyridoxine; Sjogren's syndrome; interieukin-2; aspartate aminotransferase; T-lymphocytes; vitamins ID KILLER-CELL ACTIVITY; CONNECTIVE-TISSUE; DISEASES; INTERLEUKIN-2; ASSOCIATION; CLASSIFICATION; VITAMIN-B6; RESPONSES; HORMONES; IMMUNITY AB Background: There is evidence that pyridoxine deficiency may alter the immune response. It is not known whether a deficiency of this vitamin is evident in subjects with primary Sjogren's syndrome (SS). Objective: We studied whether subjects with primary SS showed a biochemical deficiency of pyridoxine, and if it is associated with abnormal production of interleukin-2 from lymphocytes stimulated in vitro with phytohemagglutinin (PHA). Design: Two studies were conducted, (i) biochemical and nutritional assessments were performed in a cross-over study in subjects with primary SS, who were supplemented with 25 mg/day of pyridoxine or placebo for 3 months. After 1 month washout they were supplemented for 3 months with placebo, (ii) patients with SS and matched controls received pyridoxine or placebo for 45 days, and a blood sample was obtained to study IL-2 production and expression in T-lymphocytes stimulated with PHA. Results: Subjects with primary SS showed limited dietary intake of pyridoxine and biochemical deficiency of this vitamin assessed through the activation coefficient of the erythrocyte aspartate aminotransferase. The biochemical deficiency did not affect production nor mRNA expression of IL-2 from T-lymphocytes stimulated in vitro with PHA compared with the control group. Supplementation of subjects with primary SS with 25 mg/day with pyridoxine for 45 days did not produce any significant change as compared to those patients supplemented with placebo. Conclusions: Subjects with primary SS showed biochemical deficiency of pyridoxine, possibly due to limited intake of this vitamin which was corrected by supplementation with pyridoxine. However, IL-2 production and mRNA expression from stimulated lymphocytes were unaffected by supplementation, probably because the deficiency was not severe enough to affect the immune system. Sponsorship: This work was supported by the National Council of Science and Technology (CONACYT), Mexico, grant no. 212226-5-0902PM. C1 Inst Nacl Ciencias Med & Nutr, Dept Fisiol Nutr, Mexico City 14000, DF, Mexico. Inst Nacl Ciencias Med & Nutr, Dept Immunol & Rheumatol, Mexico City 14000, DF, Mexico. RP Tovar, AR, Inst Nacl Ciencias Med & Nutr, Dept Fisiol Nutr, Vasco de Quiroga 15, Mexico City 14000, DF, Mexico. 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J. Clin. Nutr. PD NOV PY 2002 VL 56 IS 11 BP 1087 EP 1093 PG 7 SC Nutrition & Dietetics GA 616XA UT ISI:000179327600004 ER PT J AU Rafael-Morales, M Gortar, JCD TI Reduced consumption and environment pollution in Mexico by optimal technical driving of heavy motor vehicles SO ENERGY LA English DT Article AB The consumption of fuel by heavy motor vehicles, both passenger and freight, driven on typical Mexican roads, has a direct influence on pollutant emissions. This fuel consumption strongly depends on driving practices, as has been shown by data gathered in field tests conducted with a large number of vehicles in a variety of driving conditions. So-called 'technical driving', which essentially means an optimal use of the engine speed and torque, has demonstrated substantial savings in fuel consumption and, therefore, is an effective practice for the reduction of pollutant emissions. In this paper, the main results of an extended field study, using the technical driving, are presented. (C) 2002 Elsevier Science Ltd. All rights reserved. C1 UNAM, Fac Ingn, Dept Thermal Engn, Mexico City 04510, DF, Mexico. Inst Mexicano Transporte, Sanfandila 76700, Mexico. RP Gortar, JCD, UNAM, Fac Ingn, Dept Thermal Engn, Ciudad Univ, Mexico City 04510, DF, Mexico. CR *MEX COMM EFF US E, 1994, INT REP EN SAV TRANS *MEX DEP EN, 2000, REP 1999 NAT GLOB EN CLARK JC, 1995, J CLIN FORENSIC MED, V2, P143 FERGUSON CR, 2000, INTERNAL COMBUSTION MORLOCK EK, 1978, INTRO TRANSPORTATION RAFAEL MY, 1998, P 8 WORLD C TRANSP R SANCHEZ MF, 1998, THESIS U W VIRGINIA VANTELON A, 1991, 12 NAT S RAT US EN M NR 8 TC 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0360-5442 J9 ENERGY JI Energy PD DEC PY 2002 VL 27 IS 12 BP 1131 EP 1137 PG 7 SC Engineering, Chemical; Energy & Fuels GA 616MK UT ISI:000179307400005 ER PT J AU Garcia-Garcia, MD Ponce-de-Leon, A Garcia-Sancho, MC Ferreyra-Reyes, L Palacios-Martinez, M Fuentes, J Kato-Maeda, M Bobadilla, M Small, P Sifuentes-Osornio, J TI Tuberculosis-related deaths within a well-functioning DOTS control program SO EMERGING INFECTIOUS DISEASES LA English DT Article ID RURAL SOUTH-AFRICA; POSITIVE PULMONARY TUBERCULOSIS; DRUG-RESISTANT TUBERCULOSIS; DIRECTLY OBSERVED THERAPY; MYCOBACTERIUM-TUBERCULOSIS; MORTALITY; MEXICO; EPIDEMIOLOGY; CHEMOTHERAPY; COUNTRIES AB To describe the molecular epidemiology of tuberculosis (TB)-related deaths in a well-managed program in a low-HIV area, we analyzed data from a cohort of 454 pulmonary TB patients recruited between March 1995 and October 2000 in southern Mexico. Patients who were sputum acid-fast bacillus smear positive underwent clinical and mycobacteriologic evaluation (isolation, identification, drug-susceptibility testing, and IS6110-based genotyping and spoligotyping) and received treatment from the local directly observed treatment strategy (DOTS) program. After an average of 2.3 years of follow-up, death was higher for clustered cases (28.6 vs. 7%, p=0.01). Cox analysis revealed that TB-related mortality hazard ratios included treatment default (8.9), multidrug resistance (5.7), recently transmitted TB (4.1), weight loss (3.9), and having less than 6 years of formal education (2). In this community, TB is associated with high mortality rates. C1 Inst Nacl Salud Publ Ave, Unidad TB, Cuernavaca 62508, Morelos, Mexico. Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Mexico City, DF, Mexico. Inst Nacl Enfermedades Resp, Mexico City, DF, Mexico. Secretaria Salud Estado Veracruz, Xalapa, Veracruz, Mexico. Stanford Univ, Palo Alto, CA 94304 USA. RP Garcia-Garcia, MD, Inst Nacl Salud Publ Ave, Unidad TB, Univ 655,Sta Maria Ahuacatitlan, Cuernavaca 62508, Morelos, Mexico. CR 2000, DIARIO OFICIAL 1031 *COMP RES CTR, 1992, STAT REF MAN REL 3 *I NAC DIAGN REF E, 1992, MAN TECN PROC LAB TU, P9 *I NAC EST GEOGR I, 2000, 12 CENS GEN POBL VIV, P10 *MEX MIN HLTH, 2001, VIT STAT *SECR SAL, 1995, DIARIO OFICIAL 0126, P20 *SECR SAL, 2001, DIR GEN EP SIST UN I, V18, P4 *WHO, 2001, WHOCDSTB2001287 AABY P, 1993, INT J EPIDEMIOL, V22, P156 BURMAN WJ, 1997, CHEST, V111, P1168 BUSTAMANTEMONTES LP, 2000, INT J TUBERC LUNG D, V4, P208 CONNOLLY C, 1998, INT J TUBERC LUNG D, V2, P919 CONNOLLY C, 1999, AIDS, V13, P1543 DATTA M, 1993, TUBERCLE LUNG DIS, V74, P180 ESPINAL MA, 1999, INT J TU