Browsing by Issue Date Artículos de revistas
Now showing items 701-720 of 2801
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(Associacao Brasileira de Divulgacao Cientifica, 2000)Potato apyrase, a soluble ATP-diphosphohydrolase, was purified to homogeneity from several clonal varieties of Solanum tuberosum. Depending on the source of the enzyme, differences in kinetic and physicochemical properties ...
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(2000)The reaction of CpFe(dppe)I (Cp, cyclopentadienyl; dppe, Ph2P(CH2)(2)PPh2) with biologically active RSH molecules (L-cysteine hydrochloride, dithiothereitol and 2-mercaptoethanol) in the presence of NH4PF6 and in methanol ...
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(2000)Electronic substituent effects may be rationalized in terms of Hammett- like linear relationships between global energy-dependent quantities and local electronic descriptors of reactivity. These linear relationships are ...
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(2000)A novel cucurbitacin glycoside has been isolated from aerial parts of Kageneckia oblonga R. et P. and shown to be 3 beta-(beta-D-glucosyloxy)-16 alpha,23 alpha-epoxycucurbita-5,24-dien-11-one. The structure was established ...
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(Sociedad Chilena de Quimica, 2000)Physicochemical parameters, ε, λ, solubility in water and Brij-35, pKa, Ka and photostability for dihydroeuparin, 5-acetyl-2, 3-dihydro-6-hydroxi-2-isopropenyl-benzo (b) furan (from Senecio Graveolens), were obtained and ...
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(2000)The new complexes [CpM(L2)NCCH2Fc]PF6 (M = Fe 1, Ru 2; Fc = ferrocenyl), have been prepared from reaction of CpM(L2)X and the ligand Fc-CH2CN 3 in methanol and in the presence of NH4PF6. The compounds were characterized ...
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(2000)The crystalline ion pair [Co2{OOC-CCo3(CO)9}5, C10H6(N(CH3)2)2H] (1) presents unusual magnetic properties. The X-band EPR spectrum of 1 at room temperature presents two unresolved bands at g = 1.98 and 4.55. At a low ...
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(Sociedad Chilena de Cardiología y Cirugía Cardiovascular, 2000)La novedad y creatividad son los dos requisitos esenciales en toda investigación, ya sea ésta de tipo clínica, básica o básico-clínica. En al actualidad ambos aspectos son básicos para la adjudicación de un proyecto de ...
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(PERGAMON-ELSEVIER SCIENCE, 2000)This paper reports both the electrochemical characterization and the reactivity of the nitroso radical anion from nitrosobenzene with glutathione. The reduction of nitrosobenzene to the corresponding nitroso radical anion ...
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(PERGAMON-ELSEVIER SCIENCE, 2000-01)A series of 3-chloro-phenyl-1,4-dihydropyridine derivatives produced different degrees of inhibition of parasite growth and respiration on clone Brener, LQ and Tulahuen strains of Trypanosome cruzi epimastigotes. Respiratory ...
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(AMERICAN PHYSICAL SOC, 2000-01)Thin freely suspended films of a mixture of an achiral side-chain liquid crystal polymer and its monomer have been studied with depolarized reflected light microscopy. We observe that regions with an odd number of bilayers ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2000-01)We have tested several chemical modifiers to investigate which amino acid residues, present in the primary structure of the ecto-apyrase, could be involved in catalysis. Synaptosomes from cerebral cortex of rats were ...
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(JOHN WILEY & SONS LTD, 2000-02)The H-1 and C-13 NMR spectra of a set of structurally related tricyclic quinones consisting of 4,4-dimethylanthracene-1,9,10(4H)-trione (1), 4,4,6,7-tetramethylanthracene-1,9,10(4H)-trione (2) and the regioisomers 4,4,5- ...
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(ELSEVIER SCI IRELAND LTD, 2000-02-28)Concern about drug abuse in modem populations has led to the development of specific methods for identification of cocaine, opiates and cannabis in human hair. Drug use in prehistory can provide indirect evidence of ...
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(SOCIEDAD CHILENA DE QUIMICA, 2000-03)The electrochemical nitroreduction of nitrofurantoin has been studied on carbon paste and glassy carbon electrodes. We can observe a monoelectronic reversible couple ArNO2/ArNO2- and an irreversible peak due to the further ...
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(SOCIEDAD CHILENA DE QUIMICA, 2000-03)The reaction between 2-p-methoxyphenyl-4-phenyl-2-oxazolin-5-one and 2,2,6,6-tetramethyl-1-piperidinyl-N-oxide (TEMPO) in benzene as the solvent generates quantitatively 4,4'-bis-[2-p-methoxyphenyl-4-phenyl-2-oxazolin-5-one]. ...
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(ENDOCRINE SOC, 2000-03)A form of polycystic ovary (PCO) resembling some aspects of the human PCO syndrome can be induced in rats by a single injection of estradiol valerate (EV). An increase in sympathetic outflow to the ovary precedes, by several ...
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(HETERO CORPORATION, 2000-03)Several new 6-amino- and 6,8-dinmino-4-aryl-2,3-dihydropyrimido[4,5-b][1,4]diazepines were obtained from the reaction of 4,5,6-triaminopyrimidine 1a and 2,4,5,6-tetraaminopyrimidine 1b with one equivalent of 3-dimethylam ...
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(ENDOCRINE SOC, 2000-03)A single injection of estradiol valerate induces a form of cystic ovary resembling some aspects of the human polycystic ovarian syndrome. Preceding the development of follicular cysts, there is an increase in intraovarian ...
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(WILEY-V C H VERLAG GMBH, 2000-03)Tacrine, 9-amino-1,2,3,4-tetrahydroacridine, an antialzheimer's disease agent was electrochemically studied and a polarographic method For its quantitative determination in pharmaceuticals was developed. Tacrine was ...
