Browsing by Issue Date Artículos de revistas
Now showing items 21-40 of 4966
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(1970)WE wish to report a new method with which we have been able to measure the sodium and potassium conductance changes postulated by Hodgkin and Huxley1 in the course of a single action potential. To measure the membrane ...
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(1970)The two major methionyl-tRNA species from wheat embryos and E. coli have been studied as regards their capacity to form a ternary complex with GTP and the ribosomal binding enzyme from both sources. Methionyl-tRNA1 from ...
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(1970)The adsorption of bovine serum albumin (BSA) at an air/water interface was shown to be reversible and the equilibrium adsorption isotherm measured for concentrations between 0.001% and 10.0%. The desorption of BSA into a ...
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(ELSEVIER, 1970-03-17)Sophora tetraptera sensu Reiehe seeds were examined for alkaloids. Cytisine, methyleytisine and matrine were isolated, and a fourth alkaloid was deteeted by TLC. The relative amounts of the three major alkaloids support ...
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(Comite de Investigaciones Científicas y Tecnológicas de la Universidad Técnica del Estado, 1971)Se separaron seis fracciones químicamente diferentes de hojas de Solanum malacoxylon Sendtner por extracción con solventes selectivos, y se ensayó la acción de estas fracciones sobre el metabolismode calcio y fósforo ...
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(1971)The problem of spatial variation of the order parameter in the neighborhood of a nonmagnetic impurity with broadened d levels is investigated near the superconducting critical temperature. It is shown that, due to resonance ...
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(1971)The following glycolytic enzyme activities were demonstrated in membrane fractions isolated from squid retinal nerve: phosphoglyceric kinase, pyruvic kinase, glyceraldehyde-3-phosphate dehydrogenase, aldolase, glucose-6-phosphate ...
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(1971)This paper discusses, first, the selective pressures which led to the two basic types of animal eyes, compound vs. camera eyes. Secondly, it considers what is the significance of the apparent similarity of the wiring ...
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(ELSEVIER, 1971-07-30)Trichocereus chilensis (Colla) Br. & R. is the only Chilean member of its genus figuring in the literature as having been examined for alkaloids, although previous reports are negative. Djerassi and coworkers1 found no ...
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(American Chemical Society, 1971-08-02)
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(ELSEVIER, 1972)Hojas y tallos de Solanum pinnatum Cav., cosechados cerca de Longotoma (Aconcagua), fueron procesados para estudiar su contenido de glicoalcaloides y sapogeninas neutras esteroidales. Se pudo aislar solasonina, solamargina, ...
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(1972)Absorption spectral, circular dichroic spectral, and viscosity measurements indicate that the compact low-spin conformation characteristic of native cytochrome c is quantitatively recovered from its extended high-spin ...
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(1972)In terms of the usual RKKY indirect exchange interaction, the spiral antiferromagnetic phase of Europium cannot be attributed to a 'nesting' of opposite faces of the tetracube portion of the Fermi surfaces. © 1972.
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(1972)The model recently proposed by Ramírez and Falicov is generalized by the incorporation of the spin-orbit splitting of the 4f shell. This generalization provides an understanding of the fractional valence and magnetic ...
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(1972)The problem of energy propagation through a one-dimensional open-ended finite chain is critically reexamined. Free end boundary conditions are imposed and quantum-field-theory operators, consistent with these boundary ...
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(1972)Ground and excited singlet state dipole electric π polarizabilities of a set of conjugated molecules are calculated. Second order perturbation theory is used in the Epstein–Nesbet and Möller–Plesset versions. Hückel and ...
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(1972)Changes in the fatty acid composition of egg‐yolk fat of hens fed diets with increasing fish meal content are studied by total fatty acid analysis. The fatty acid composition of the major lipid fractions in egg‐yolk fat ...