Browsing by Issue Date Artículos de revistas
Now showing items 921-940 of 2801
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(ELSEVIER SCIENCE BV, 2002-11-15)Sixty-three pregnant llamas of known breeding date were used in this study. Forty-six of them were submitted to surgery between 186 and 320 days of gestation (52-91% of average gestation period, respectively). Under general ...
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(SOC GENERAL MICROBIOLOGY, 2002-12)The authors previously reported increased expression of the Salmonella enterica serovar Typhi (S. typhi) rfaH gene when the bacterial cells reach stationary phase. In this study, using a lacZ fusion to the rfaH promoter ...
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(ELSEVIER SCIENCE BV, 2002-12)A new method for the simultaneous determination of iron and ruthenium at ultra-trace levels is proposed. The method is based on the formation of the iron and ruthenium complexes with 2,4,6-tri-(2-pyridil)-1,3,5-triazine ...
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(SPRINGER-VERLAG, 2002-12)1-Octadecene (C18) was polymerized by using different metallocene catalysts. The rac-Et(Ind)(2)ZrCl2/MAO (I) and rac-Me2Si(Ind)(2)ZrCl2/MAO (III) presented the highest C, activity as compared with rac-Et(2-Me-Ind)(2)ZrCl2/MAO ...
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(ELSEVIER SCI LTD, 2002-12)The viscoelastic relaxations of four copolymers of ethylene and I-octadecene, with different comonomer contents, synthesized with a metallocene catalyst, have been analysed and compared to those of the corresponding ...
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(SOCIEDAD CHILENA DE QUIMICA, 2002-12)A reliable methodology for identification and quantification of Polycyclic Aromatic Hydrocarbons (PAHs) in atmospheric aerosols has been developed, using extraction with dichloromethane, a clean-up step for purification ...
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(SOCIEDAD CHILENA DE QUIMICA, 2002-12)A new Rhenium (I) and Ruthenium(II) bimetallic polipyridilcarbonil complex and the corresponding monometallic precursor complexes were prepared. The compounds were characterized physically and spectroscopically (Elemental ...
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(ELSEVIER SCIENCE BV, 2002-12-05)This work presents a simple and fast method for the simultaneous determination of amiloride and furosemide by digital derivative spectrophotometry. HCl 1 x 10(-2) mol/l dissolved in ethanol was used as solvent and to extract ...
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(WILEY-LISS, DIV JOHN WILEY & SONS INC, 2002-12-15)Substantial evidence now exists indicating that the neurotrophins, a family of growth factors required for the survival, development, and differentiation of various neuronal populations of the nervous system, are also ...
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(Ministerio de Educación Superior, 2003)Seven types of chemical sensors based on polymeric liquid membranes for determination of nitrate ion have been prepared by using 3-nitro-o-xylene (NOX), tri-butyphosphate (TBP), bis-(2-ethylhexyl)sebacate (DOS), ...
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(Asociación de Químicos e Ingenieros del Instituto Químico de Sarría, 2003)The statistical evaluation of seven ion selective chemical sensors (ISE) for nitrate ion determination, based on polymeric membranes on a conductive support, has been carried out in this work. This was donw in order to ...
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(Sociedad Chilena de Química, 2003)Descriptor combinations, consisting of the electrotopological state (E-state) indexes of some skeletal groups, the first-order 'ҳ molecular connectivity index and the logarithm of the statistical factor, are employed to ...
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(Real Academia Nacional de Farmacia del Instituto de España, 2003)El objetivo de este trabajo fue evaluar la irritación y el efecto hidratante de los ésteres de AHA's. Se evaluó el efecto irritante de los ésteres málico, láctico y salicílico en comparación a sus respectivos ácidos ...
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(Ministerio de Educación Superior, 2003)Nitrate concentration in drinking water was directly determined by employing an ion selective liquid membrane electrode (ISE). This was constructed with poly(vynil chloride) as matrix on a solid conducting support. ...
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(Ministerio de Educación Superior, 2003)An ion selective electrode for nitrate, composed of 2-[5-(4-nitrophenyl)furyl]-4,5-diphenyl imidazole as ionophore and dioctylphthalate (DOP) as plasticizers in poly[vynil chloride] (PVC) supported on a conducting resin, ...
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(Dirección de Bibliotecas, Archivos y Museos. Centro Nacional de Conservación y Restauración, 2003)Se desarrolló un protocolo de reconocimiento de barnices empleados en pintura de caballetes utilizando Cromatografía en Placa Fina (TLC). La identificación del barníz se realizó comparando el perfil de elusión cromatográfico ...
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(Sociedad Latinoamericana de Nutrición, 2003)En el músculo de especies marinas existen compuestos no protéicos que ese usan como índices de calidad, estos corresponden a contenido de bases volátiles totales (BVT), óxido de trimetilamina (OTMA) y trimetilamina (TMA). ...
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(Sociedad Chilena de Química, 2003)The feasibility of MASE application in the determination of Bensulfuron-methyl (BSM) in soils with different organic matter content, consequently with a different capability to absorb this herbicide is studied. Hydrolysis ...
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(ELSEVIER SCIENCE BV, 2003)Potato strips were soaked in 3, 5 or 7% NaCl solutions (25 degreesC) previous to frying, to study the effect on oil uptake. Sensory responses indicated the best texture and lowest oil uptake at 3% NaCl solution for 50 min. ...
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Electrochemical and EPR characterization of 1,4-dihydropyridines. Reactivity towards alkyl radicals (TAYLOR & FRANCIS LTD, 2003)This work reports the electrochemical oxidation of a series of three synthesized 4-substituted-1,4-dihydropyridine derivatives in different electrolytic media. Also, an EPR characterization of intermediates and the reactivity ...
