Browsing by Title Facultad de Ciencias
Now showing items 7882-7901 of 8168
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(2006)Metaphors are not just rhetorical devices, but also very powerful cognitive tools. We can check through learning experiments that they help us, not only to learn new ideas, but also that they provide very efficient means ...
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(2014)Se describe e ilustra una nueva especie, Bipinnula gabriel (Orchidaceae). Esta nueva especie habita en el tipo de bosque esclerófi lo costero de Chile Central, en la localidad de Putú, Constitución, Región del Maule. ...
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(2012)The present work presents a measurement uncertainty evaluation according to Guide to the Expression of Uncertainty in Measurement (GUM) of the concentration of the cations K + and Li + and anions NO 3 -2 and SO 4 -2 in ...
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(Springer, 2011-11-19)The present work presents a measurement uncertainty evaluation according to Guide to the Expression of Uncertainty in Measurement (GUM) of the concentration of the cations K? and Li? and anions NO3 -2 and SO4 -2 in ...
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(Elsevier B.V., 2011-09-01)A comparison of the ozone primary reference standard photometer serial number 45 (SRP45) against the National Institute of Standards and Technology (NIST) instruments, serial number 0 (SRP0) and 2 (SRP2), has been performed ...
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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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(ELSEVIER, 2008-06-11)Binding of MgATP to an allosteric site of Escherichia coli phosphofructokinase-2 (Pfk-2) provoked inhibition and a dimer-tetramer (D-T) conversion of the enzyme. Successive deletions of up to 10 residues and point mutations ...
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(University of Chicago, 2007-09)Models of ecological communities are traditionally based on relationships between pairs of species, where the strengths of per capita interactions are fixed and independent of population abundance. A growing body of ...
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(Peking University Press, 2018)Chemical reactivity towards electron transfer is captured by the Fukui function. However, this is not well defined when the system or its ions have degenerate or pseudo-degenerate ground states. In such a case, the first-order ...
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(2007)Global and local indices based on the spin-polarized density functional theory (SP-DFT) have been used to rationalize the philicity power and spin polarization pattern of a family of singlet substituted phenylhalocarbenes, ...
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(Springer, 2015)The three-dimensional quantitative structure-activity relationship (3D QSAR) models have many applications, although the inherent complexity to understand the results coming from 3D-QSAR arises the necessity of new insights ...
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(Cooper Ornithological Soc., 2015)An understanding of the ecological factors determining bird species’ distributions is essential for making informed conservation decisions. These data are especially important for range-restricted species, such as the ...
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(Universite Paris-Sud, 2018)It has been proposed that NADP+ -specificity of isocitrate dehydrogenase (ICDH) evolved as an adaptation of microorganisms to grow on acetate as the sole source of carbon and energy. In Escherichia coli, changing the ...
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(2009)The mechanisms of the Diels-Alder (DA) reactions of 2-methoxy-5-methyl-1,4-benzoquinone 1 with 2-methyl-1,3-butadiene 2, in the absence and in the presence of LA catalysts, have been studied using the DFT method at the ...
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(Elsevier B.V., 2009-03-03)The mechanisms of the Diels–Alder (DA) reactions of 2-methoxy-5-methyl-1,4-benzoquinone 1 with 2- methyl-1,3-butadiene 2, in the absence and in the presence of LA catalysts, have been studied using the DFT method at the ...
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(American Chemical Society, 2020)The existence of polycrystalline shells has been widely reported in the synthesis of hollow nanoparticles; however, the exact role displayed by the grain boundaries on the stability has been scarcely studied. By including ...
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(MDPI, 2021)A real space understanding of the Su-Schrieffer-Heeger model of polyacetylene is introduced thanks to delocalization indices defined within the quantum theory of atoms in molecules. This approach enables to go beyond the ...
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(Wiley, 2018)Aim: We assess biogeographical patterns, population structure and the range of species in the pulmonate genus Siphonaria across the sub-Antarctic. We hypothesized that locally endemic cryptic species will be found across ...
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(Sociedad Medica de Santiago, 2020)
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Unfolding pathway of the dimeric and tetrameric forms of phosphofructokinase-2 from Escherichia coli (2007)Escherichia coli phosphofructokinase-2 (Pfk-2) is an oligomeric enzyme characterized by two kinds of interfaces: a monomer-monomer interface, critical for enzymatic activity, and a dimer-dimer interface formed upon ...