Artículos de revistas: Recent submissions
Now showing items 1101-1120 of 4968
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(1998)Ion channels lie at the heart of gamete signaling. Understanding their regulation will improve our knowledge of sperm physiology, and may lead to novel contraceptive strategies. Sperm are tiny (~ 3 μm diameter) and, until ...
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(1998)Host-plant resistance can affect herbivorous insects and their natural enemies such as parasitoids and entomopathogenic fungi. This tritrophic effect acts on interspecific interactions between the two groups of natural ...
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(Polish Academy of Sciences, 1998)Huddling is effective in decreasing metabolic rate permitting energy saving. However, this decrease varies among different species depending on physical, physiological and behavioral characteristics of the huddled individuals. ...
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(1998)Proteinase inhibitors (chymotrypsin and trypsin inhibitors) accumulation in barley leaves was studied when the plants were infested with the aphids Schizaphis graminum and Rhopalosiphum padi. Aphid infestation resulted ...
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(Universite Laval, 1998)Following a short-term infestation by aphids, wheat seedlings show an increase in their concentration of hydroxamic acids (Hx), secondary metabolites conferring resistance against insects. The benefits for a wheat cultivar ...
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(Springer-Verlag, 1995)The antinociceptive activity of antidepressant drugs is poorly understood. In this study, using the acetic acid writhing test in mice, the antinociception produced by clomipramine (CLO), maprotiline (MAP), imipramine (IMI), ...
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(Springer New York, 1998)Activation is a fundamental and well-known concept in chemistry. It may be qualitatively defined as an increase in the chemical reactivity pattern of a molecule at a given site k when the system is locally perturbed at a ...
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(Sociedad Mexicana de Fisica, 1998)The stoichiometric elpasolites of the type Cs2NaLnCl6 are known to belong to the space group Fm3m(script O signh 5). The structural data of these elpasolites is both scare and rather limited and therefore a throughout ...
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(Sociedad Mexicana de Fisica, 1998)The well-resolved emission and absorption spectra of centrosymmetric coordination compounds of the transition metal ions have been used widely to provide the experimental data against which to test theoretical models of ...
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(1998)One of the most representative cases in which the relation individual-environment is evident is the heat exchange between animals and their physical environment. Based on the physical laws regulating heat exchange and on ...
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(1998)Cultures of cerebellar macroneurons were used to study the pattern of expression, subcellular localization, and function of the neuronal cdk5 activator p35 during laminin-enhanced axonal growth. The results obtained indicate ...
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Mixed conductivity and lithium diffusion in poly(ethylene oxide) molybdenum disulfide nanocomposites (Elsevier, 1998)The electrical conductivity, the lithium diffusion, and the diffusion activation thermodynamics of the nanocomposites arising from the co-intercalation of lithium and poly(ethylene oxide) in molybdenum disulfide, ...
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Peroxisomal and microsomal fatty acid oxidation in liver of rats after chronic ethanol consumption (1998)1. Microsomal P450 and peroxisomal fatty acid oxidation activities were studied in liver of rats after long-term ethanol consumption. 2. Ethanol increased the microsomal lauric acid ω-hydroxylation and the aminopyrine ...
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(Sociedad Mexicana de Fisica, 1998)In this research work, we report the synthesis and structural characterization of the stoichiometric elpasolite Cs2NaSmCl6. The synthesis was performed under a solid state reaction in nitrogen atmosphere from the chemicals ...
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(Sociedad Mexicana de Fisica, 1998)The optical properties of Cs2NaEuCl6 system are reinvestigated on the basis of new and updated experimental data from Raman, electronic Raman, Infrared absorption and visible luminescence. These experimental studies have ...
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(Sociedad Mexicana de Fisica, 1998)The visible and near infrared luminescence spectra of MoCl63- in Cs2NaMCl6 (M=Sc, Y, ln) and MoBr63- in Cs2NaYBr6 have been reported between 15 000 cm-1 and 3000 cm-1 at liquid helium temperatures. It has been observed ...
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(1995)Mineral requirements of normal infants change according to growth velocity. They are directly associated to needs for obtaining an adequate composition of new tissue, assure an optimal bone mineralization and for maintaining ...
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(1998)1. Ten racemic β-alkoxy-β-phenylethylamines were found to elicit concentration dependent contraction of the isolated rat thoracic aorta with apparent pot values in the 4.56-6.76 range. With one exception, which produces ...
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(Elsevier, 1998)Atmospheric aerosol samples collected in five sites in the Metropolitan Area of Mexico City were analyzed with proton induced X-ray emission (PIXE). Stacked Filter Units (SFU) of the Davis design were employed to obtain ...
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(Elsevier, 1998)Here, we present the analysis of wood to determine trace elements in tree rings. We have irradiated wood pieces directly, for thick target PIXE, and also thin samples obtained by chemical treatment of the wood material. ...