Browsing by Title Facultad de Ciencias
Now showing items 6423-6442 of 8181
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(Academic Press, 2017)© 2016 Elsevier Ltd The systematics of elasmosaurids are not well resolved partially because of the scarcity of well-preserved skull material. Among Weddellian elasmosaurids, one exception to this is the holotype of ...
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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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(Taylor and Francis Ltd., 2001)Thermodynamic and dynamic properties of intercalation products of lithium into MoS2 are strongly determined by the coordination of lithium in the interlaminar spaces. Lithium redox potentials as well as lithium diffusion ...
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(Academic Press Inc., 2010)Glutamyl-tRNA synthetases (GluRS) provide Glu-tRNA for different processes including protein synthesis, glutamine transamidation and tetrapyrrole biosynthesis. Many organisms contain multiple GluRSs, but whether these ...
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(Universidad de Chile, 2005)Considerando un cuerpo de funciones racionales F(x) sobre un cuerpo F, donde F es de características ‡2. Construimos el análogo al algoritmo de reducción de Lenstra-Lenstra-Lovasz sobre cuerpos de funciones racionales y ...
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(Universidad de Chile, 1987)Se estuüó la electroreducción de los hexacarbonilos del grupo 6 en amoníaeo liquido, proponiéndose un mecanismo para dicho proceso. Se muest"a que la reacción de reducción electroqulmica de diehos compuestos en amoniaco ...
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(Oxford Univ Press, 2015)Landscape fragmentation is often a major cause of species extinction as it can affect a wide variety of ecological processes. The impact of fragmentation varies among species depending on many factors, including their ...
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(ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2007-01)Most semi-arid and and regions around the world have lost a major part of their original vegetation.. Restoration of once shrublands and woodlands is often challenged by low seedling establishment success due to water ...
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(SPRINGER, 2007-07)El Nino Southern Oscillation (ENSO) events have profound consequences for the dynamics of terrestrial ecosystems. Since increased climate variability is expected to favour the invasive success of exotic species, we conducted ...
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(2005)Assessments of the effects of invertebrate herbivores on high-altitude plants have seldom taken into account both mutualistic and antagonistic interactions. To evaluate the effect of herbivores (antagonists) and pollinators ...
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(2009)The relationship between the nanoscale structure of vanadium pentoxide nanotubes and their ability to accommodate Li+ during intercalation/ deintercalation is explored. The nanotubes are synthesized using two different ...
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(Universisdad de Chile, 2004)Después de la etapa semilla, la plántula representa la fase mas sensible en el ciclo de vida d las plantas, porque es durante este periodo donde ocurren las mayores tasas de mortalidad. Las plántulas presentan un sistema ...
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(BELGIAN MATHEMATICAL SOC TRIOMPHE, 2006-06)We prove two theorems of reduction of cocycles taking values in the group of diffeomorphisms of the circle. They generalize previous results obtained by the author concerning rigidity for smooth actions on the circle of ...
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(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2008-12-12)The link between a new variant form of Creutzfeldt-Jakob disease (vCJD) and the consumption of prion contaminated cattle meat as well as recent findings showing that vCJD can be transmitted by blood transfusion have raised ...
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(American Chemical Society, 2020)Reduction of carbonyl moieties to the corresponding alcohol using simply hydrazine hydrate has been considerably unfeasible until now due to the well-known condensation reaction. However, herein, we report that using an ...
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(1997)We report the reaction of gallic acid with chloroacetic acid and three equivalents of sodium hydroxide. In this reaction, 2,6-dihydroxy-4-carboxyphenoxyacetic acid (A) is produced instead of 2,3-dihydroxy-5-carboxyphenoxyacetic ...
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(Universidad de Chile., 1979)Mediante la técnica de refecundación in vitro se ha estudiado el comportamiento de la membrana plasmática de huevos fecundados de hámster frente a espermios heterólogos.
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(2007)A vibrational study of the calix[4]arene derivative 25,26,27,28-tetracarboethoxy-p-tert-butylcalix[4]arene (TCEC) is accomplished in this work. This characterization implies a study of its adsorption on metal (Cu and Ag) ...
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(Taylor and Francis Ltd., 2019)Concerns about poor L1 reading skills in undergraduate students have been expressed in several contexts. These skills form a basis for building robust L2 reading comprehension skills, vital for translators. This study, ...
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(Ediciones Universidad de Concepción, 2017)Este estudio constituye una contribución al conocimiento de la concepción descriptivo-mítica de la naturaleza vegetal en la época homérica, realizado sobre la base de las referencias botánicas y etnobotánicas consignadas ...