Facultad de Ciencias Químicas y Farmacéuticas: Publicaciones electrónicas recientes
Mostrando registros 4301-4320 de 5198
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(ELSEVIER SCIENCE BV, 2000-05-12)To clarify the mechanism involved in the appearance of antiferroelectric properties in mixtures of polymers containing achiral mesogenic side chains and their monomers, X-ray investigation was carried out in pyroelectrically ...
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(GORDON BREACH SCI PUBL LTD, 2000)In this paper we report on the synthesis and characterization of new mixtures of achiral liquid crystalline side-chain polymers with their monomers. The samples have a basic structure similar to materials prepared earlier ...
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(TAYLOR & FRANCIS LTD, 1996-12)X-ray structure determination and pyroelectric and piezoelectric measurements have been carried out on mesogenic mixtures composed of achiral side chain polymers and their monomers. Certain mixtures show antiferroelectric ...
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(ELSEVIER, 2011-01-01)We report for the first time the use of quaternized chitosan (QCHI) for the immobilization of gold nanopartides (NP) and glucose oxidase (GOD), the characterization of the resulting platform and its biocatalytic activity ...
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(Pergamon Press Ltd., 1981)Mixed 1:1:1 complexes of proline or aspartic acid with Cu(II) and 9:10-phenanthroline (phen) or 2,2'bipyridine (bipy) show induced Cotton effects in the aromatic region. The effect is ascribed to interactionsbetween the ...
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(Pergamon Press Ltd., 1981)
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Optical activity of nickel(II) and copper(II) complexes with L-aminoacids in the UV spectral region (Elsevier Sequoia, 1972)Complexes of Cu(II) and Ni(II) with L-aminoacids have been prepared and their UV spectra and optical activity studied. The results are interpreted in terms of the conformation of the chelated rings. A molecular orbital ...
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(Elsevier Science Publishers B. V., 1997)Acid dissociation constants of α- and β-D-glucos-, mannos-, and galactos-ammonium ions have been determined from 1H NMR chemical shifts of the individual anomers in D2O. Values of pKa(D) for the α- and β-ammonium ions ...
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(Elsevier Science Publishers B.V., 1993)The 1H NMR signals of the hydrochlorides of 2-amino-2-deoxy-α and β -D-Glucose (α-and β-D-glucosamine) have been assigned and chemical shifts and coupling constants determined from their phase-sensitive COSY spectra in ...
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Estudio de disolución de pulpa mecánica en la mexcla dimetilacetamida/cloruro de litio (DMAc/LiCl) (Sociedad Chilena de Química, 1994)Se estudiaron dos procedimientos para la disolución de la pulpa mecánica (PM). Un método en caliente permitió disolver la pulpa en un 63,5% y un método en frío o de intercambio de solvente que solo permitió disolver un 10,1%.
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(Pergamon Press, 1985)The preparation of aminocomplexes of Co(III) containing D-ribose, L-sorbose or D-glucosamine as second ligand is described. Their spectral features and optical activity are reported. Formation in solution of complex ...
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(Pergamon Press, 1981)Complexes of Cu(II) with L-aminoacids have positive charge transfer bands in their CD spectra at ca.230 nm and negative at ca. 270 nm. Examination of complexes with L-1,2-diamino propane shows that the positive band is ...
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(Pergamon Press, 1969)The shift of the first and second spin allowed bands due to the stepwise replacement of the nitrogen atoms in a complex of Cr(III) of the CrN6 type of oxigen atoms of water or of carboxylic groups is analized in terms of ...
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(Pergamon Press, 1977)Chiral amino acids bonded to copper(II) induce Cotton effects in the visible and UV regions corresponding tod-d and charge transfer transitions [1,2] but and induced Cotton effect on a distant ligand has not been observed ...
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(Pergamon Press, 1975)In the u.v. region the C.D. spectra of mixed complexes of Cu(II), aminoacids and heterocyclic ligands depend upon the nature of the heterocyclic ligand, and work on the Cotton effects of bis-Ł-aminoacidates of cu(II) in ...
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(Sociedad Chilena de Química, 1997)D-β-Mannosamine reacts with cobalt(III) bis-phenanthroline to form a single 1:1 complex with the ∆ configuration at Co(III) which can be isolated as the stable triiodide salt.
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(Sociedad Chilena de Química, 1995)Examination of 1H chemical shifts of a complex of D-glucosamine with bis-phenanthroline cobalt(III)shows that the dominant ∆-complex is formed from α-D-glucosamine. A molecular mechanics simulation of the structure of ...
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(Royal Society of Chemistry, 1987)In piridine - formic acid buffer and tetramethylammonium chloride solution of pH 4.5 at a dropping mercury or a glassy carbon electrode, nitrofurazone, furazolidone and nitrofurantoin are reduced in a single six-electron ...
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(Universidad Nacional del Sur y Consejo de Investigaciones Científicas y Técnicas, 1996)The etherification reaction of mechanic pulp (MP) with dimethylsulphate (DMS) in homogeneous media was studied using a 2 5-1 fractional factional experimental design. In according to this model the quantity of DMS/2 g ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 1992-11)Two isoenzymes of ATP-diphosphohydrolase (apyrase) were extracted and purified from S. tuberosum var. Ultimus. Their hydrolytic activity ratios (ATPase/ADPase) were 1.0 (apyrase B) and ca 15.0 (apyrase A). They were ...
