Artículos de revistas: Recent submissions
Now showing items 4841-4860 of 4968
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(2007)The landscape (matrix) surrounding habitat fragments critically affects the biodiversity of those fragments due to biotic interchange and physical effects. However, to date, there have been only a limited number of studies ...
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(2007)In the yeast Xanthophyllomyces dendrorhous the genes idi, crtE, crtYB, crtI and ast are involved in the biosynthesis of astaxanthin from isopentenyl pyrophosphate. The carotenoid production and the kinetics of mRNA expression ...
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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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(2007)(S)-Aporphine metho salts with the 1,2,9, 10 oxygenation pattern displaced radioligands from recombinant human 0 and alpha 4 beta 2 neuronal nicotinic acetylcholine receptors (nAChR) at low micromolar concentrations. The ...
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(2007)Global and local indices based on the spin-polarized density functional theory (SP-DFT) have been used to rationalize the philicity power and spin polarization pattern of a family of singlet substituted phenylhalocarbenes, ...
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(2007)Neural oscillations, which appear in several areas of the nervous system and cover a wide frequency range, are a prominent issue in current neuroscience. Extracellularly recorded oscillations are generally thought to be a ...
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(2007)Geo-referenced archive databases on mountain organisms are very promising tools for achieving a better understanding of mountain biodiversity and predicting its changes. The Global Mountain Biodiversity Assessment (GMBA) ...
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(2007)A theoretical study of the beta-scission reactions for some thioimidoyl radicals (R-1-N=C-center dot-S-R-2) using a recently introduced homofugality index, nu(center dot) is presented. This index, that was defined as a ...
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Unfolding pathway of the dimeric and tetrameric forms of phosphofructokinase-2 from Escherichia coli (2007)Escherichia coli phosphofructokinase-2 (Pfk-2) is an oligomeric enzyme characterized by two kinds of interfaces: a monomer-monomer interface, critical for enzymatic activity, and a dimer-dimer interface formed upon ...
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(2007)We introduce and test a nucleophilicity index as a new descriptor of chemical reactivity. The index is derived from a perturbation model for the interaction between the nucleophile and a positive test charge. The computational ...
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(2007)Cellular glutathione levels may exceed vitamin C levels by 10-fold, generating the question about the real antioxidant role that low intracellular concentrations of vitamin C can play in the presence of a vast molar excess ...
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(2007)Olfactory learning may occur at different stages of insect ontogeny. In parasitoid wasps, it has been mostly shown at adult emergence, whilst it remains controversial at pre-imaginal stages. We followed larval growth of ...
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(American Chemical Society, 2006-03-16)In this work surface-enhanced resonance Raman spectroscopic experiments have demonstrated that metallic single-walled carbon nanotubes can be used as chemical assemblies between the pyrene analyte and the silver colloidal ...
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(BLACKWELL, 2006-07)The brain uses massive amounts of oxygen, generating large quantities of reactive oxygen species (ROS). Because of its lipid composition, rich in unsaturated fatty acids, the brain is especially vulnerable to ROS. Furthermore, ...
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(AMER ASSOC ADVANCEMENT SCIENCE, 1999-09-17)Maxi-K channels consist of a pore-forming alpha subunit and a regulatory beta subunit, which confers the channel with a higher Ca2+ sensitivity. Estradiol bound to the beta subunit and activated the Maxi-K channel (hSlo) ...
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(GAUTHIER-VILLARS/EDITIONS ELSEVIER, 2006-05)Nectar thieves may increase or decrease pollinator-mediated pollen flow and thus may have positive or negative effects on plant reproductive success. In temperate rainforests of South America, the hummingbird Sephanoides ...
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(OXFORD UNIV PRESS, 2007)Phosphorus deficiency is one of the major nutrient stresses affecting plant growth. Plants respond to phosphate (Pi) deficiency through multiple strategies, including the synthesis of high-affinity Pi transporters. In this ...
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(NATL ACAD SCIENCES, 1997-05-13)Large conductance calcium- and voltage-sensitive K+ (MaxiK) channels share properties of voltage- and ligand-gated ion channels. In voltage-gated channels, membrane depolarization promotes the displacement of charged ...
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(AMER PHYSIOLOGICAL SOC, 2002-03)We studied the effect of H2O2 on the gating behavior of large-conductance Ca2+-sensitive voltage-dependent K+ (K-V,K-Ca) channels. We recorded potassium currents from single skeletal muscle channels incorporated into ...
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(ROCKEFELLER UNIV PRESS, 2000-02)When attached outside the voltage-sensing S4 segment of the Shaker potassium channel, the fluorescent probe tetramethylrhodamine (TMRM) undergoes voltage-dependent fluorescence changes (Delta F) due to differential interaction ...
