Browsing by Title Artículos de revistas
Now showing items 3800-3819 of 4968
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(1995)We perform a theoretical study of the response of neutral and ionized metal clusters to the elastic impact of slow electrons. We center our attention on Na40 and Na41+ closed-shell clusters. A phase-shift analysis is ...
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(2003)The Rapel reservoir (34º S; 71ºW) was impounded in 1968 and the phytoplankton community shows the effects of eutrophication processes and later contamination due to the affluence of agrochemicals and copper mining clear ...
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(Frontiers Media, 2022)Microorganisms have evolved to colonize all biospheres, including extremely cold environments, facing several stressor conditions, mainly low/freezing temperatures. In general, terms, the strategies developed by cold-adapted ...
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(Human Sciences Press, 1989)
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(Elsevier Masson SAS, 2014)© 2014 Institut Pasteur.The response of Acidithiobacillus ferrooxidans ATCC 23270 to copper was analyzed in sulfur-grown cells by using quantitative proteomics. Fortyseven proteins showed altered levels in cells grown in ...
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(Taylor & Francis, 2020)Larvae of Leptus hringuri parasitizing families (adult female + offspring) of the treehopper Alchisme grossa on two host-plants, Brugmansia suaveolens (BS) and Solanum ursinum (SU), were studied. The effect of microenvironmental ...
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(ELSEVIER SCIENCE BV, 2010-05-02)Acetylcholine and ATP appear to mediate excitatory transmission between receptor (glomus) cells and the petrosal ganglion (PG) neuron terminals in the carotid body. In most species these putative transmitters are excitatory, ...
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(2009)Although it is recognized that anthropogenic forest fragmentation affects habitat use by organisms across multiple spatial scales, there is uncertainty about these effects. We used a hierarchical sampling design spanning ...
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(Elsevier, 1999)NaCN is a classical stimulus used to elicit discharges from carotid body chemoreceptors. The effect is assumed to be mediated by glomus (type I) cells, which release an excitatory transmitter for the excitation of carotid ...
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(Allen Press, 2020)Understanding animals' daily activity patterns such as foraging and resting is key to the effective conservation of individuals, populations, and species. Expanding habitat usage by humans today is likely one of the major ...
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(Wiley-Blackwell, 2016)Endotherms maintain high and constant body temperatures through the production and maintenance of metabolic heat. Defining the evolutionary history of these thermal adaptations and the selective factors responsible for the ...
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(CAMBRIDGE UNIV PRESS, 2009-06)Avian Plasmodium and Haemoproteus parasites are easily detected by DNA analyses of infected samples but only correctly assigned to each genus by sequencing and use of a phylogenetic approach. Here, we present a restriction ...
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(Laboratorios Mixim S.A., 1974-09-25)The leaves and bark of Cryptocarya alba (Mo\.) Looser (Lauraceae) were examined for alkaloida, and found to contaín a single basic component, whích was isolated and shown to be (+)-reticuline(l). This substance was ...
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(Elsevier GmbH, 2015)© 2014 Elsevier GmbH.Retinoic acid (RA), a vitamin A metabolite, has been attributed to relevant functions in adaptive immunity. On T cells, the disruption on RA signaling alters both CD4+ and CD8+ T cells effector function. ...
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(MDPI, 2016)Vitamin A, a generic designation for an array of organic molecules that includes retinal, retinol and retinoic acid, is an essential nutrient needed in a wide array of aspects including the proper functioning of the visual ...
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(American Museum of Natural History, 2015)
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(2007)Long-term potentiation (LTP) is an activity-dependent strengthening of synapses that is thought to underlie memory storage. Ca2+/ calmodulin-dependent protein kinase II (CaMKII) has been a leading candidate as a memory ...
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(ELSEVIER SCIENCE BV, 2009-05-22)Escherichia coli phosphofructokinase-2 (Pfk-2) is a homodimer whose subunits consist of a large domain and an additional b-sheet that provides the interfacial contacts between the subunits, creating a b-barrel flattened-like ...
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(2002)The stability, refolding, and assembly properties of FtsZ cell division proteins from Methanococcus jannaschii and Escherichia coli have been investigated. Their guanidinium chloride unfolding has been studied by circular ...
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(Pergamon Journals Ltd., 1986-10-28)The structures of three alkaloids isolated from Guatteria dielsiana, 6-methoxyonychine, dielsine and dielsinol, originally described as l-azafluoren-9-ones, are revised to 4-azafluoren-9-ones on the basis of previous synthetic ...