Artículos de revistas: Recent submissions
Now showing items 781-800 of 4968
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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.
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(1990)Two new ent-labdanes were isolated from the leaves of Baccharis paniculata. The results of a chemical study of other three Baccharis species are reported. © 1990.
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(2005)We give a characterization of the representations on train algebras of rank 3. We prove that the subalgebra of the algebra of endomorphisms of a module generated by the representation of the nil ideal of the algebra is ...
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(Elsevier GmbH, 2004)
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(American Institute of Mathematical Sciences, 2018)© 2018 American Institute of Mathematical Sciences. All rights reserved. We study a chemostat model with an arbitrary number of competing species, one substrate, and constant dilution rates. We allow delays in the growth ...
