Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 44421-44440 of 98648
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(Springer Verlag, 2017)© 2016, Springer-Verlag Berlin Heidelberg. Antarctica is considered one of the most extreme environments on Earth because of its low temperatures, dryness, high incidence of solar radiation and low nutrient availability. ...
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(Springer Verlag, 2016)© 2016, The Author(s). Studies of different hypersaline systems have revealed various types of limitation. We evaluated the phototrophic microbial assemblages over a whole seasonal cycle (wet vs dry) in the Salar de Alconcha, ...
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(Springer Verlag, 2017)© 2016, Springer-Verlag Berlin Heidelberg. The understanding of the spatial and temporal patterns in land use and land cover (LULC) change is a key issue for conservation efforts. In the Chilean hotspot, different studies ...
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(Taylor and Francis Ltd., 2017)© 2016 Informa UK Limited, trading as Taylor & Francis Group.Two unusual caprolactam alkaloids, 3-(dimethylamino)hexahydro-2H-azepin-2-one and 3-(methylamino)-hexahydro-2H-azepin-2-one, were isolated from the aerial parts ...
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Surface-enhanced Raman scattering and theoretical study of the bilichromes biliverdin and bilirubin (Taylor and Francis Inc., 2016)© 2016, Copyright © Taylor & Francis Group, LLC. The surface-enhanced Raman scattering spectra of biliverdin and bilirubin were obtained and analyzed; a physical silver ligand interaction was inferred. The structural ...
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(Wilson Ornithological Society, 2014)© 2014 by the Wilson Ornithological Society.The simulated presence of conspecifics has been proposed to attract territorial songbirds to protect nesting areas when the habitat is being disturbed by human activities. We ...
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(Society for Neuroscience, 2016)© 2016 the authors. Rab35 is a key protein for cargo loading in the recycling endosome. In neuronal immortalized cells, Rab35 promotes neurite differentiation. Here we describe that Rab35 favors axon elongation in rat ...
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(Sociedad Chilena de Pediatria, 2016)© 2016 Sociedad Chilena de Pediatría. Children with special health care needs" (CSHCN) is an emerging and heterogeneous group of paediatric patients, with a wide variety of medical conditions and with different uses of ...
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(Taylor and Francis Inc., 2016)© 2016, Copyright © Taylor & Francis Group, LLC. The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and ...
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(Springer Tokyo, 2016)© 2016, Springer Japan. The study of the yeasts that inhabit cold environments, such as Antarctica, is an active field of investigation oriented toward understanding their ecological roles in these ecosystems. In a great ...
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(Scholars Research Library, 2016)We employed a formal QSAR method to find the main interactions regulating the variation of the ability to inhibit the germination of Lactuca sativa seeds by a small group of phenolic acids. The same techique was employed ...
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(1990)The IR spectra of nitrobenzene-do and -ds were recorded in gas and liquid phases at 25° C and in amorphous solid phase at -170°C. The appearance of new bands and intensity changes going from liquid to solid phase spectrum, ...
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(1992)S-O stretching force constants in a series of synmetrical sulfoxide compounds were calculated from quantum chemical methods. Molecular geometries were obtained from experimental data and from MNDO and PM3 calculations. S-O ...
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(Research Journal of Pharmaceutical, Biological and Chemical Sciences, 2016)Allelopathic effects of a chemical compound strongly depends on the target species, dose or concentration employed, structure of the molecule and physical properties, such as water solubility, lipophilicity and others. In ...
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(1992)A comparison of some structural aspects of these complexes with Cp Re(CO)3 are also discussed. Additionally, the preparation and characterization of the trimethyl phosphite derivative is reported. A complete vibrationalassignment ...
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(Springer Verlag, 2014)© 2014, Springer-Verlag Berlin Heidelberg.The mechanism of Menshutkin reaction, NH3 + CH3Cl = [CH3–NH3]+ + Cl-, has been thoroughly studied in both gas and solvent (H2O and cyclohexane) phase. It has been found that solvents ...
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(John Wiley and Sons Ltd, 2004)Theoretical electrophilicity and nucleophilicity scales, defined in terms of electronic reactivity indices, were tested for the reaction of a series of carbonates with neutral and charged reagents of varying nucleophilicity. ...
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(American Chemical Society, 2003)In this paper we describe a method to obtain estimates of the relative nucleophilicity for a series of neutral and charged electron donors from their solution phase ionization potential (Is). The relationship between ...
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(1994)A Kohn-Sham (KS) like formalism for the calculation of solvation energies of singly charged ions is presented. The approximate theory is based on a simple model that represents embedding an atomic ion into a polarizable ...
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(American Chemical Society, 2001)A thorough quantitative analysis of the HSAB principle is performed. Complex formation reactions of a typical soft acid, Ag+, and typical hard acid, HF, with the bases XH3 (X = N, P, As) are studied using the DFT/B3LYP ...
