Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 42901-42920 of 97873
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(Elsevier Masson SAS, 1998)In this paper we consider the study of standing wave solutions for a nonlinear Schrödinger equation. This problem reduces to that of finding nonnegative solutions of ε2Δu - V (x) u + (Latin small letter esh) (u) = 0 in Ω. ...
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(1996)Deuterium quadrupole splittings from the aromatic ring of a series of linear N-alkylpyridinium-d5 ions, with alkyl chains from 1 to 16 carbon atoms, were measured using 2H-NMR spectroscopy. The pyridinium ions, 10% deuteriated ...
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(Kluwer Academic Publishers-Plenum Publishers, 1992)DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one), a secondary metabolite found in cereal extracts, confers resistance in wheat to aphids. Its effect on beneficial organisms was tested on larvae of the aphid predator ...
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(American Society of Plant Biologists, 1998)Uridine 5′-diphosphate-glucose (UDP-Glc) is transported into the lumen of the Golgi cisternae, where is used for polysaccharide biosynthesis. When Golgi vesicles were incubated with UDP-[3H]Glc, [3H]Glc was rapidly transferred ...
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(American Chemical Society, 1996)Natural hydroxamic acids and related compounds derived from 1,4-benzoxazin-3-one structures inhibited the growth of the alga Chlorella xanthella and the fungus Candida albicans. On the basis of structure-activity relationships ...
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(Blackwell Munksgaard, 1998)The new heterobimetallic complex [{LaEu(oda)3(H2O)3.-5H2O} n] (oda = -O2CCH2OCH2CO2 -) has been synthesized and structurally characterized. Three tridentate oda ligands are coordinated to the smaller EuIII cation, while ...
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(Kluwer Academic Publishers, 1988)Fifty-five accessions of Triticum species were analyzed for content of hydroxamic acids (Hx), a natural resistance factor against various organisms. Hx were found in all accessions analyzed. Extreme values were found in ...
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(Elsevier, 1997)A symmetry adapted formalism to evaluate the vibronic intensities induced by the ungerade vibrational modes in centrosymmetric coordination compounds of the rare earths is put forward and applied to several selected ...
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(2000)We report measurements of the topography of a gold film deposited on a mica substrate using scanning tunneling microscope (STM), and measurements of the conductivity σ of the film performed between 4 and 300 K. From images ...
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(1997)Thirteen alkaloids were identified from the stem-bark of Erythroxylum lucidum by GC-MS. Seven of these have not been reported previously in the genus Erythroxylum. Most of them are precursors or intermediates in the ...
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(1991)From 11 Chilean Senecio species eight new furoeremophilanes and eremophilanolides, eight eremophilane, one cadinane, five germacrane, one oplopanone and five shikimic acid derivatives were isolated in addition to known ...
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(1998)We study the propagation of electrons (or excitations) through a one-dimensional tight-binding chain in the simultaneous presence of nonlinearity and diagonal disorder. The evolution of the system is given by a disordered ...
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(1993)Voltammetric studies of nimodipine using a mixed aqueous dimethylformamide (DMF) solvent have allowed us to generate the one-electron reduction product, the nitro radical anion RNO2 .. The cyclic voltammetry technique has ...
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(Academic Press Inc., 2018)© 2018 Elsevier Inc. We apply the theory of Bruhat–Tits trees to the study of optimal embeddings from orders of rank two and three to quaternion algebras. Specifically, we determine how many conjugacy classes of global ...
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(1974)The first ten potassium-argon determinations made on andesitic rocks of the Andes and Coastal ranges of central-south Chile, between latitudes 36° and 42° South, demonstrate the existence of at least two main cycles of ...
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(Verlag der Zeitschrift fur Naturforschung, 2001)Viscidone (0.5%), vanillin, 3′,4′-(methylendioxy)acetophenone, 3-ethoxy-4-methoxybenzaldehyde, cinnamic acid, 3-methoxy-4-hydroxymethyl ester were isolated from propolis of hives from Cuncumen. This is the first report on ...
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(1992)The aerial parts of Gutierrezia resinosa gave 15 new diterpenes including 12 labdanes and three nerylgeraniol derivatives. The structures were elucidated by high field NMR spectroscopy. © 1992.
