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Relevant bibliographies by topics / Permeant anion

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Journal articles

Academic literature on the topic 'Permeant anion'

Author: Grafiati

Published: 14 March 2023

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Journal articles on the topic "Permeant anion"

1

Lai, Xiao-Gang, Jun Yang, Shi-Sheng Zhou, Jun Zhu, Gui-Rong Li, and Tak-Ming Wong. "Involvement of anion channel(s) in the modulation of the transient outward K+ channel in rat ventricular myocytes." American Journal of Physiology-Cell Physiology 287, no. 1 (2004): C163—C170. http://dx.doi.org/10.1152/ajpcell.00297.2003.

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The cardiac Ca2+-independent transient outward K+ current ( Ito), a major repolarizing ionic current, is markedly affected by Cl− substitution and anion channel blockers. We reexplored the mechanism of the action of anions on Ito by using whole cell patch-clamp in single isolated rat cardiac ventricular myocytes. The transient outward current was sensitive to blockade by 4-aminopyridine (4-AP) and was abolished by Cs+ substitution for intracellular K+. Replacement of most of the extracellular Cl− with less permeant anions, aspartate (Asp−) and glutamate (Glu−), markedly suppressed the current.

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2

De Jesús-Pérez, José J., Alejandra Castro-Chong, Ru-Chi Shieh, Carmen Y. Hernández-Carballo, José A. De Santiago-Castillo, and Jorge Arreola. "Gating the glutamate gate of CLC-2 chloride channel by pore occupancy." Journal of General Physiology 147, no. 1 (2015): 25–37. http://dx.doi.org/10.1085/jgp.201511424.

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CLC-2 channels are dimeric double-barreled chloride channels that open in response to hyperpolarization. Hyperpolarization activates protopore gates that independently regulate the permeability of the pore in each subunit and the common gate that affects the permeability through both pores. CLC-2 channels lack classic transmembrane voltage–sensing domains; instead, their protopore gates (residing within the pore and each formed by the side chain of a glutamate residue) open under repulsion by permeant intracellular anions or protonation by extracellular H+. Here, we show that voltage-dependent

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3

Franciolini, F., and W. Nonner. "Anion and cation permeability of a chloride channel in rat hippocampal neurons." Journal of General Physiology 90, no. 4 (1987): 453–78. http://dx.doi.org/10.1085/jgp.90.4.453.

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The ionic permeability of a voltage-dependent Cl channel of rat hippocampal neurons was studied with the patch-clamp method. The unitary conductance of this channel was approximately 30 pS in symmetrical 150 mM NaCl saline. Reversal potentials interpreted in terms of the Goldman-Hodgkin-Katz voltage equation indicate a Cl:Na permeability ratio of approximately 5:1 for conditions where there is a salt gradient. Many anions are permeant; permeability generally follows a lyotropic sequence. Permeant cations include Li, Na, K, and Cs. The unitary conductance does not saturate for NaCl concentratio

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4

Grover, A. K., A. P. Singh, P. K. Rangachari, and P. Nicholls. "Ion movements in membrane vesicles: a new fluorescence method and application to smooth muscle." American Journal of Physiology-Cell Physiology 248, no. 3 (1985): C372—C378. http://dx.doi.org/10.1152/ajpcell.1985.248.3.c372.

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A method is described for studying ion permeabilities of membrane vesicles based on the principle that when membrane permeability to H+ is very high, the H+ movement is determined by the membrane potential generated by the H+ movement. The rate of H+ movement under these conditions thus gives a measure of the rate of dissipation of this membrane potential by comovement of anions or countermovement of cations present. Thus, by studying the H+ efflux using an impermeant cation and different anions, the membrane permeability to the anions can be assessed. Similarly, the use of an impermeant anion

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5

Linsdell, Paul, and John W. Hanrahan. "Adenosine Triphosphate–dependent Asymmetry of Anion Permeation in the Cystic Fibrosis Transmembrane Conductance Regulator Chloride Channel." Journal of General Physiology 111, no. 4 (1998): 601–14. http://dx.doi.org/10.1085/jgp.111.4.601.

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The cystic fibrosis transmembrane conductance regulator (CFTR) forms a tightly regulated channel that mediates the passive diffusion of Cl− ions. Here we show, using macroscopic current recording from excised membrane patches, that CFTR also shows significant, but highly asymmetrical, permeability to a broad range of large organic anions. Thus, all large organic anions tested were permeant when present in the intracellular solution under biionic conditions (PX/PCl = 0.048–0.25), whereas most were not measurably permeant when present in the extracellular solution. This asymmetry was not observe

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6

DAWSON, DAVID C., STEPHEN S. SMITH, and MONIQUE K. MANSOURA. "CFTR: Mechanism of Anion Conduction." Physiological Reviews 79, no. 1 (1999): S47—S75. http://dx.doi.org/10.1152/physrev.1999.79.1.s47.

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Dawson, David C., Stephen S. Smith, and Monique K. Mansoura. CFTR: Mechanism of Anion Conduction. Physiol. Rev. 79, Suppl.: S47–S75, 1999. — The purpose of this review is to collect together the results of recent investigations of anion conductance by the cystic fibrosis transmembrane conductance regulator along with some of the basic background that is a prerequisite for developing some physical picture of the conduction process. The review begins with an introduction to the concepts of permeability and conductance and the Nernst-Planck and rate theory models that are used to interpret these

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7

Linsdell, P., and J. W. Hanrahan. "Flickery block of single CFTR chloride channels by intracellular anions and osmolytes." American Journal of Physiology-Cell Physiology 271, no. 2 (1996): C628—C634. http://dx.doi.org/10.1152/ajpcell.1996.271.2.c628.

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Cystic fibrosis transmembrane conductance regulator (CFTR) is a phosphorylation- and nucleotide-dependent chloride channel. Single CFTR currents recorded on cell show slight outward rectification, which has previously been suggested to be due to an asymmetrical chloride ion gradient or to a specific interaction between permeant intracellular anions and the channel. Using a single-channel recording from Chinese hamster ovary cells stably expressing CFTR, we have found that both the sparingly permeant anion glutamate and the impermeant anion gluconate cause a rapid, voltage-dependent block of CF

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8

Qu, Zhiqiang, and H. Criss Hartzell. "Anion Permeation in Ca2+-Activated Cl− Channels." Journal of General Physiology 116, no. 6 (2000): 825–44. http://dx.doi.org/10.1085/jgp.116.6.825.

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Ca2+-activated Cl channels (ClCaCs) are an important class of anion channels that are opened by increases in cytosolic [Ca2+]. Here, we examine the mechanisms of anion permeation through ClCaCs from Xenopus oocytes in excised inside-out and outside-out patches. ClCaCs exhibited moderate selectivity for Cl over Na: PNa/PCl = 0.1. The apparent affinity of ClCaCs for Cl was low: Kd = 73 mM. The channel had an estimated pore diameter &gt;0.6 nm. The relative permeabilities measured under bi-ionic conditions by changes in Erev were as follows: C(CN)3 &gt; SCN &gt; N(CN)2 &gt; ClO4 &

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9

Franciolini, F., and W. Nonner. "A multi-ion permeation mechanism in neuronal background chloride channels." Journal of General Physiology 104, no. 4 (1994): 725–46. http://dx.doi.org/10.1085/jgp.104.4.725.

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Unitary current/voltage relationships of background Cl channels of rat hippocampal neurons were determined for varied gradients and absolute concentrations of NaCl. The channels revealed permeabilities for both Cl and Na ions. A hyperlinear increase of unitary conductance, observed for a symmetrical increase of salt concentration from 300 and 600 mM, indicated a multi-ion permeation mechanism. A variety of kinetic models of permeation were tested against the experimental current/voltage relationships. Models involving a pore occupied by mixed complexes of up to five ions were necessary to repr

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10

Stutzin, Andrés, Rubén Torres, Macarena Oporto, et al. "Separate taurine and chloride efflux pathways activated during regulatory volume decrease." American Journal of Physiology-Cell Physiology 277, no. 3 (1999): C392—C402. http://dx.doi.org/10.1152/ajpcell.1999.277.3.c392.

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Organic osmolyte and halide permeability pathways activated in epithelial HeLa cells by cell swelling were studied by radiotracer efflux techniques and single-cell volume measurements. The replacement of extracellular Cl− by anions that are more permeant through the volume-activated Cl− channel, as indicated by electrophysiological measurements, significantly decreased taurine efflux. In the presence of less-permeant anions, an increase in taurine efflux was observed. Simultaneous measurement of the125I, used as a tracer for Cl−, and [3H]taurine efflux showed that the time courses for the two

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