Browsing by Title Facultad de Ciencias
Now showing items 1021-1040 of 8178
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(Univ Houston, 2016)We introduce covariant structures {(A, kappa), (a, alpha), ((a) over tilde, (alpha) over tilde)} formed of a separable C*-algebra A, a measurable twisted action (a, alpha) of the second-countable locally compact group G, ...
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(Walter de Gruyter GmbH, 2020)
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(ELSEVIER, 2006)Neuronal nicotinic acetylcholine receptors subserve predominantly modulatory roles in the brain, making them attractive therapeutic targets. Natural products provide key leads in the quest for nicotinic receptor subtype-selective ...
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(2006)Thapsigargin, a specific inhibitor of most animal intracellular SERCA-type Ca2+ pumps present in the sarcoplasmic/endoplasmic reticulum, was originally isolated from the roots of the Mediterranean plant Thapsia gargancia ...
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(PLoS ONE, 2013)The Ca2+-activated Cl2 channel is considered a key constituent of odor transduction. Odorant binding to a specific receptor in the cilia of olfactory sensory neurons (OSNs) triggers a cAMP cascade that mediates the opening ...
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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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(ELSEVIER SCIENCE BV, 2005-03-14)Olfactory cilia contain cyclic nucleotide-gated and Ca2+-dependent Cl- conductances that underlie excitatory chemotransduction, and a Ca2+-dependent K+ (K-Ca) conductance, apparently involved in inhibitory transduction. ...
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(Universidad de Magallanes, 2017)Archaeological and ethnohistorial data show that smoking practices in the central-southern region of Chile begins during the Early Ceramic period and continue until historical times. In view of this long time span, twelve ...
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(Journal of Nutrition, 2008-05)Iron deficiency, a condition currently affecting ;3 billion people, persists in the 21st century despite half a millennium of medical treatment. Soybean ferritin (SBFn), a large, stable protein nanocage around a mineral ...
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(ELSEVIER, 1971-07-30)Trichocereus chilensis (Colla) Br. & R. is the only Chilean member of its genus figuring in the literature as having been examined for alkaloids, although previous reports are negative. Djerassi and coworkers1 found no ...
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(Universidad de Chile, 1990)El propósito principal de esta tesis es aportar evidencias experimentales, que ayuden a precisar los mecanismos responsables de la hipertensión, observada en aquellos individuos expuestos a cadmio, tales como aquellos que ...
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(ELSEVIER, 1980-10-13)A new bisbenzylisoquinoline alkaloid fran Berberis buxifolia was chemically correlated with ealafatine. On this basis, and using spectranetric evidence, structure 1is proposed for ealafatirnine. The stereochanistry ...
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(Universidad Técnica del Estado, 1978-11)La calafatina es un componente importante de las mezclas de alcaloides no cuaternarios de la corteza de tronco y de las raiees de Berberis buxifolia Lam. ("calafate"). Sobre la base de estudios espectrométricos de esta ...
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(ELSEVIER, 1979-09-26)Spectrometric and chemical evidence is presented that calafatine, an alkaloid from Berberis buxifolia, has structure l. The substitution pattern on ring E is unique ln isoquinoline alkaloids.
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(1993)1. A single dose of pentazocine induces cross-tolerance the analgesic effects of the kappa agonist U 50488H. Tolerance is observed by means of the hot plate test or by the i.p. administration of acetic acid 6 or 24 hr after ...
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(Cell Press, 2001)Calcium signals participate in the differentiation of electrically excitable and nonexcitable cells; one example of this differentiation is the acquisition of mature neuronal phenotypes [1]. For example, transient elevations ...
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(2000)Nitric oxide (NO) activates a K+ current in dissociated amphibian olfactory receptor neurons. Using the patch-clamp technique in its whole-cell mode and stimulation with puffs of the NO-donor sodium nitroprusside, we further ...
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(1988)Highly purified transverse tubule membranes isolated from frog skeletal muscle phosphorylate phosphatidylinositol to phosphatidylinositol 4-phosphate and phosphatidylinositol (4,5)-bisphosphate. The two phosphorylation ...
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(Elsevier Ltd, 1998)Calcium-activated potassium channels are fundamental regulators of neuronal excitability, participating in interspike interval and spike-frequency adaptation. For large-conductance calcium-activated potassium (BK) channels, ...
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(ELSEVIER, 2004-10-21)All-electron spin polarized DFT calculations have been performed to optimize the pentagonal bipyramidal (D-5h) geometry of the Cu-7 cluster by using the B3LYP and the B3PW1 functionals with different basis sets. Dirac ...