Artículos de revistas: Recent submissions
Now showing items 981-1000 of 4968
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(1990)Four new sesquiterpenes, 9β-benzoyloxy-1α,6β-diacetoxy-15-hydroxy-dihydro-β- agarofuran, 9β-benzoyloxy-1α,6β, 15-triacetoxy-8α-hydroxydihydro-β-agarofuran, 9β-benzoyloxy-1α,6β,8α,15-tetracetoxydihydro- β-agarofuran and 1α, ...
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(1993)In the present study a copper mixed valence (MV) compound has been generated photochemically from the (CH3COO)2Cu(II)Cu(II)(OOCCH3)2 dimeric species in 95/5% (vol./vol.) methanol/acetic acid mixture as solvent. The MV ...
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(1981)Results are presented for the total and metallic nickel areas of a series of coprecipitated nickel-alumina catalysts prepared and pretreated in different ways. The total areas of the samples decrease on reduction and with ...
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(Kluwer Academic Publishers, 1991)Microcalorimetric enthalpy measurements associated with the different peaks appearing during linear heating of Cu-3.34 at % Sn were made in a 50% cold-rolled alloy. Unlike the situation in the deformed material, quenched ...
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(1995)The synthesis, characterization and the reversible interaction with oxygen of a Cu(I)-mercaptoethylamine complex (I) in aqueous solution and room temperature is reported. As a result of the interaction with oxygen a violet ...
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(1976)Functional micelles of hexadecyl(2-hydroxyethyl)dimethylammonium bromide (I) are better catalysts than hexadecyltrimethylammonium bromide (CTABr) for the alkaline hydrolysis of diethyl and di-n-hexyl p-nitrophenyl phosphate ...
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(1999)We analyze a one-dimensional spin system with two Dzialoshinsky-Moriya-like interactions which couple spins in pairs and triads, respectively. In spite of its intricate aspect, we obtain a very simple solution by means of ...
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(1985)By means of the force field and mean amplitudes of vibration of furan, thiophene, selenophene and tellurophene molecules, we have concluded that the ground-state aromaticity order in the series is thiophene > tellurophene ...
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(1991)N,N′-dithiobisamines, R2N-S-S-NR2, NR2N(CH3)2, N(CH2CH3)2, {A figure is presented}, {A figure is presented} or N(CH2-C6H5)2, are oxidized to SO2 by copper(II) salts with formation of copper(I) complexes, while from the ...
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(1991)A method to estimate the contribution to the vibronic intensity in electronic transitions of inorganic complex ions due to second order terms in the Herzberg-Teller expansion of vibronic wavefunctions is developed and ...
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(Elsevier, 1997)New local functionals for the kinetic and Hartree-Fock exchange energy of atoms are proposed. They are of the following general form: T[ρ] =22/3CF ∫ ∑σρ5/3 σf(r,ρ σ)dr. The function f(r,ρσ), except for two adjustable ...
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(1996)A wild Chilean population of coho salmon (Oncorhynchus kisutch (Walbaum, 1792)) was started using eggs imported from Oregon, U.S.A. A hatchery population was founded using eggs collected from this wild population, and a ...
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(Kluwer Academic Publishers, 1992)Fracture statistics in rectangular bars subjected to torsion and to three-point bending are studied and the cumulative probabilities of fracture using Weibull's functions for materials that exhibit volume brittleness are ...
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(1998)Counterion condensation to poly(1,1-dimethyl-3,5-dimethylene piperidinium) through the behavior of the relative conductimetric interaction parameter f* in methanol/water solutions is analyzed. The trend of this parameter ...
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(Oxford University Press, 1984)Root tips of both Araucaria araucana (Mol.) Koch and Araucaria angustifolia (Bert.) O. Ktze. were used as sources of mitotic chromosomes. Both species have 26 chromosomes as the diploid number, consisting of 13 pairs of ...
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(1984)The indol alkaloid gramine inhibited photophosphorylation, Pi-ATP exchange reaction and proton gradient, and enhanced electron transport in spinach thylakoids with I50 around 0.2 m M.It thus behaves as a typical uncoupler ...
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(1993)Density functional theory provides physically meaningful ionic radii to build up electrostatic potentials for singly charged negative and positive monoatomic ions. On the basis of these electrostatic potentials, electrostatic ...
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(1994)Ionic fluxes play a key role in the activation of respiration and motility, in chemotaxis, and in the acrosome reaction of sea urchin spermatozoa, and therefore in fertilization. There is growing evidence that ion channels ...
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(1995)In olfactory neurons from Caudiverbera caudiverbera, a mixture of putrid odorants trigger an inhibitory, K+-selective current and a hyperpolarizing receptor potential. The current-voltage relation resembles that of a ...
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(1995)The diurnal courses of CO2 assimilation and stomatal conductance in spring were determined in trees of Prosopis chilensis growing in Quebrada San Carlos, Vicuña, 4th Region, Chile. These two parameters along with proline ...