Río Gallegos, Provincia de Santa Cruz, Argentina

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    ABSTRACT: Resumen. Con estos aportes pretendemos dar a conocer los recursos virtuales más conocidos para poder iniciar una investigación de orden cualitativo usando como materia prima la narrativa de/sobre los videojuegos.
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    ABSTRACT: Hibernation and daily torpor are two distinct forms of torpor, and although they are related, it is not known how and in which sequence they evolved. As the pattern of torpor expressed by the oldest marsupial order the opossums (Didelphimorphia) may provide insights into the evolution of torpor, we aimed to provide the first quantitative data on the thermal biology and torpor expression of the rare Patagonian opossum (Lestodelphys halli). It is the opossum with the southernmost distribution, has a propensity of autumnal fattening, and therefore, is likely to hibernate. We captured two male Lestodelphys, which while in captivity displayed strong daily fluctuations of body temperatures (Tb) measured with implanted miniature data loggers even when they remained normothermic. In autumn and early winter, torpor was expressed occasionally when food was available, but cold exposure and food withdrawal increased torpor use. The mean Tb throughout the study was 32.2 ± 1.4 °C, the minimum Tb measured in torpid Lestodelphys was 7.7 °C, average torpor bout duration was 10.3 h, and the maximum torpor bout duration was 42.5 h. Thus, the pattern of torpor expressed by Lestodelphys was intermediate between that of daily heterotherms and hibernators suggesting that it may represent an ancestral opportunistic torpor pattern from which the derived patterns of daily torpor and seasonal hibernation diverged.
    The Science of Nature 09/2013; 100(10). DOI:10.1007/s00114-013-1098-2
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    ABSTRACT: The isomorphous title compounds, [Tr(S4O6)(C12H12N2)2]·2C3H7NO (Tr = Cd(II) and Zn(II)), consist of metal centres to which one tetrathionate and two 4,4'-dimethyl-2,2'-bipyridine chelating ligands bind. The structures are completed by two symmetry-related dimethylformamide solvent molecules. Each metal-centred complex is bisected by a twofold axis running through the metal centre and halving the chelating tetrathionate dianion through the central S-S bond. The ancillary symmetry-related 4,4'-dimethyl-2,2'-bipyridine ligands act as chelates. This results in a distorted six-coordinate geometry, with similar Tr-O/N distances but central angles differing substantially from 90 and 180°. Both ligands are basically featureless from a geometric point of view, with torsion angles in both coordinated tetrathionate groups suggesting a trend linking metal size (covalent radius) and ligand `openness'. Packing is directed by (C-H)aromatic...O bridges and π-π offset stacked interactions defining chains along [001], further linked by weaker (C-H)methyl...O bridges, some of them mediated by the dimethylformamide solvent molecules.
    Acta Crystallographica Section C Crystal Structure Communications 07/2013; 69(Pt 7):745-9. DOI:10.1107/S0108270113016521


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    Lisandro de la Torre 960, 9400, Río Gallegos, Provincia de Santa Cruz, Argentina
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    (02966) 442370 /76 /77
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Top publications last week by reads

4° Congreso Nacional y 2° Internacional de Investigación Educativa; 01/2006
12 Reads
II Encuentro de Investigadores de la Patagonia Austral; 09/2012
10 Reads

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