Browsing by Issue Date Artículos de revistas
Now showing items 821-840 of 2801
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(PERGAMON-ELSEVIER SCIENCE, 2001-12)A gas chroma tographic-mass spectrometric (GC-MS) method for the qualitative and quantitative determination of melatonin plus pyridoxine commercial tablets is described. Melatonin and pyridoxine were simultaneously determined ...
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A selective voltammetric method to follow the hydrolytic degradation of nitrendipine and nisoldipine (WILEY-V C H VERLAG GMBH, 2001-12)The development and application of a differential pulse voltammetric procedure for the hydrolytic degradation kinetic study of two well-known 1,4-dihydropyridine type drugs, nitrendipine and nisoldipine are presented. The ...
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(ELSEVIER SCIENCE SA, 2001-12-31)Detection of O-2((1)Delta(g)) phosphorescence emission, lambda(max) = 1270 nm, following laser excitation and steady state methods were employed to determine the total rate constant, k(T), for the reaction between the ...
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(MARCEL DEKKER INC, 2002)Electron Spin Resonance spectra were obtained of the salicyliden-2-imino-5-nitropyrimidine (1(.-)), N,N-bis(5-nitro-salicyliden). ethylendiamine (2(.-)), 2-hydroxy-5-nitro-benziliden-5-iminoquinoline (3(.-)) anion I radicals ...
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(MARCEL DEKKER INC, 2002)A simultaneous microdetermination of iron and copper at sub-mug/L level by solid phase derivative spectrophotometry has been developed. The compounds TPTZ (2,4,6-tripyridyl-,3,5-triazine) and Neocuproine (2,9-dimethyl-1, ...
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(MARCEL DEKKER INC, 2002)A new simple, sensitive and selective solid phase spectrophotometric method has been developed for determination of copper in water. A sensitive analytical zone was prepared by immobilization of zincon in a Sephadex A25 ...
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(Taylor & Francis Ltd., 2002)This work reports the experience and contribution of two web pages to formal, traditional education. The aim of these pages were to: (i) provide complementary information to the courses; (ii) permit interactivity through ...
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(Consejo Superior de Investigaciones Científicas, Instituto de la Grasa y sus Derivados, 2002)Four vegetable oils with different polyunsaturated/saturated fatty acid ratio(P/S):5.2 for sunflower oil, 3.4 for canola rapeseed oil, o.4 for a blend of palm olein and canola rapeseed oil (80:20),and 0.3 for palm olein ...
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(MARCEL DEKKER INC, 2002)Syntheses of new morpholinomethylbenzamides 6 bearing both electron-withdrawing and electron-releasing groups at the aromatic ring are described. The strategy involved synthesis of hippuric acid ethyl esters 3, their ...
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(MARCEL DEKKER INC, 2002)The abundant aporphine alkaloid (S)-(+)-boldine (1) was selectively nitrosated with sodium nitrite in acetic acid affording 8-nitrosoboldine (2) which was hydrogenated catalytically to give 8-aminoboldine (3). The latter ...
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(International Medical Science for Experimental and Clinical Research, 2002)The insertion/delection ACE polymorphism (ACE I/D) regulates different levels of circulating and tissue ACE activities, which may induce diverse adrenergic responses to physiological stimuli. The aim of this study was ...
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(Sociedad Chilena de Tecnología de Alimentos, 2002)El queso es un importante producto derivado de la leche; la décima parte de la producción anual en el mundo se destina a la elaboración de queso. Para su fabricación se debe coagular la leche, lo que tiene por objetivo ...
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(Sociedad Chilena de Química, 2002)Se desarrolló una metodología confiable para la identificación y cuantificación de Hidrocarburos Aromáticos Policíclicos (Polycyclic Aromatic Hydrocarbons, PAHs) en aerosoles atmosféricos, que incluye la extracción con ...
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(MARCEL DEKKER INC, 2002)The organic matter existing in volcanic soils must be investigated not only in quantity, but also in quality in order to understand its role in soils and thus ensure adequate levels of stable organic polymers contributing ...
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(FREUND PUBLISHING HOUSE LTD, 2002)A series of 2-alkoxycarbonylbenzo[b]thiophene-4,7-quinones (11-15), prepared from the corresponding acid 5, were tested in vitro against trypomastigote form of Trypanosome cruzi. The influence of the lypophilia and oxidant ...
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(Sociedad Chilena de Química, 2002)En este trabajo se demuestra que el uso del algoritmo correspondiente al índice de conectividad de valencia tridimensional corregido [Λ(q)], utilizado a un valor de exponente óptimo, produce un valor máximo para el índice ...
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(2002)The reaction of the organometallic carboxylic acid HOOCCCHCo2(CO)6 with copper(II) methoxide leads to a new inorganometallic cluster; Cu3{í2-(CCHCo2(CO)6)}3. This cluster has a triangular core of copper(I) centers ...
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(JOHN WILEY, 2002)A gas chromatography/mass spectrometry (GC/MS) method for the qualitative and quantitative determination of the calcium-channel antagonists C-4-substituted 1,4-dihydropyridines, and their corresponding N-ethyl derivatives, ...
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(2002)Ruthenium complexes of the type [RuL(CO)2Cl2], [RuL2Cl2], [RuL2(CO)(H2O)](PF6)2, [RuL2Cl]2(PF6)2, [RuL2(CO)Cl](PF6), and [RuL2(CO3)]·3H2O (where L is a bipyridine or phenanthroline derivative) dissolved in aqueous ...
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(Institute of Food Technologists, 2002)Cholesterol oxidation, products (COPs) are present in biological tissues and in foods. The inhibitory effect of antioxidants, such as tocopherols, on COPs formation has been only partially investigated. The antioxidant ...