Browsing by Title Facultad de Ciencias
Now showing items 7928-7947 of 8178
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(American Chemical Society, 1998)Six new polyoxygenated marine monoterpenes have been isolated from the Antarctic alga Pantoneura plocamioides. The structure and relative stereochemistry of these compounds, denominated pantopyranoids A-C (1-3), and ...
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(Nature, 2021)Two species of scallop, Austrochlamys natans ("Ostion del Sur") and Zygochlamys patagonica ("Ostion patagonico") are presently exploited in the southern part of the Magallanes Province (MP). The lack of clarity in taxonomic ...
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(Elsevier Ltd, 2017)© 2016 Elsevier LtdThe structural and up-conversion properties of Er3+ doped BaTiO3 phases have been studied. All phases were synthesized using the sol-gel process. X-ray powder diffraction (PXRD), Raman spectra, scanning ...
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(Elsevier, 2018)Two types of spawning strategy have been described for ommastrephid squids: coastal and oceanic. It has been suggested that ancestral ommastrephids inhabited coastal waters and expanded their distribution into the open ...
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(Instituto Químico de Sudáfrica, 1982-01-13)A family of upper bounds for the ground-state second-order energy, derived from the Perturbation Theory, has been obtained. The bounds have been evaluated for the static electric dipole polarizability of the hydrogen atom.
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(South African Chemical Institute, 1982-01-13)onbfetaarmignyiely,d.doefTruihvpeepdebrofruobnmodusnthdhesavPfeoerrbttuehreebnagteiroovnuanludTa-htseetadotreyfo, rshtehacesonbsdeta-eotnicrder electric dipole polarizability of the hydrogen atom.
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(1986)Theoretical stellar structure models find that stars later than ∼dM3 are fully convective. It is widely believed that this should result in reduced non-radiative heating and activity levels, however, the observational ...
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(2007)Reactive iron is an important prooxidant factor, whereas GSH is a crucial component of a long-term adaptive system that allows cells to function during extended periods of high oxidative stress. In this work, the adaptive ...
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(Escuela de Ciencias del Mar, 2003)Upwelling shadows are high temperature regions within coastal upwelling systems. In this article its dynamics is described at Mejillones Bay, in the northern Chilean coast, using satellite images and in situ current data. ...
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(2014)To improve the current understanding of the ammonia distribution in the major urban area of Chile, measurements of atmospheric NH3 were collected in Santiago during three sampling periods (25 April to 27 May, 11 to 26 ...
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(Elsevier, 2020)Two hitherto unknown organometallic compounds with antitumor activity, [Ru(eta(6)-2-(1-propenyl)anisole)(en)(Cl)]PF6 (3) and [Ru(eta(6)-2-(1-propenyl)anisole)(en)(l)]PF6 (4), where en is ethylenediamine, were synthesized ...
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(John Wiley, 2013)
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(ELSEVIER, 2008-11)The use of genomics, proteomics, transcriptomics, metabolomics and other OMICs approaches together with bioinformatics tools allows a global picture of how a microbial cell operates in its community to be obtained. The ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-02-24)This study presents the outstanding chromatographic selectivity of a porous graphitic carbon support for the separation of four isomeric tropane alkaloids from the stem-bark of Schizanthus grahamii (Solanaceae). Capillary ...
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(Instituto de Investigaciones Agropecuarias, INIA, 2008-04)Accumulated chilling was estimated by applying three different models to the hourly autumn-winter temperature records from Santiago (33°34 S lat; 625 m.a.s.l.) and Vicuña (30°02´ S lat; 643 m.a.s.l.) for the years 2005 ...
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(BMJ, 2020)Objective We study the obesity transition by socioeconomic status (SES), gender and age within the Colombian urban population at the country, regional and department levels. Design The study is informed by cross-sectional ...
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(Elsevier, 2019)Peatlands are key reservoirs of belowground carbon (C) and their monitoring is important to assess the rapid changes in the C cycle caused by climate change and direct anthropogenic impacts. Frequently, information of ...
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(2006)The distribution and habitat use by carnivores can be assessed by studying their tracks or feces. If these methods are to be used confidently, they should not only unequivocally discriminate among species, but should ...
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(Hindawi, 2016)Within a woody plant species, environmental heterogeneity has the potential to influence the distribution of genetic variation among populations through several evolutionary processes. In some species, a relationship between ...