Results 221 to 230 of about 390,019 (267)
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Journal of Theoretical Biology, 1980
Abstract It is a misconception to think that extracellular electric currents of biologic origin are carried by all of the ions in the extracellular medium. It is established that, for certain reasonable boundary conditions, only those ion species that are transported across the plasma membranes of the biological system, or that chemically derive from
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Abstract It is a misconception to think that extracellular electric currents of biologic origin are carried by all of the ions in the extracellular medium. It is established that, for certain reasonable boundary conditions, only those ion species that are transported across the plasma membranes of the biological system, or that chemically derive from
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2023
In this chapter, we discuss another important property of electrolytes, i.e. how ions move in an electrolyte. We start by introducing AC impedance theory as a precise tool to measure ion conductivity, then go on to summarize other important transport properties.
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In this chapter, we discuss another important property of electrolytes, i.e. how ions move in an electrolyte. We start by introducing AC impedance theory as a precise tool to measure ion conductivity, then go on to summarize other important transport properties.
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Ion-transporting ATPases as ion channels
Naunyn-Schmiedeberg's Archives of Pharmacology, 1998Ion-transporting ATPases (pumps) hydrolyze ATP to maintain ion gradients across cell membranes. A presupposition for the maintenance of the gradients is that the ionophore of the pump that conducts the ions is accessible only from one of the two surfaces of the plasma membrane at any given time.
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1977
We can begin the discussion of ion equilibria by considering a particularly simple practical instance. Let there be two solutions, say 10 mM and 100 mM potassium chloride, separated by a cation-permeable membrane. The membrane may be made, e.g., of a cation-exchange resin and contain pores lined with fixed negative charges.
Arnošt Kotyk, Karel Janáček
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We can begin the discussion of ion equilibria by considering a particularly simple practical instance. Let there be two solutions, say 10 mM and 100 mM potassium chloride, separated by a cation-permeable membrane. The membrane may be made, e.g., of a cation-exchange resin and contain pores lined with fixed negative charges.
Arnošt Kotyk, Karel Janáček
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Ion Transport in Excitable Cells
Protoplasma, 1967All the available evidence indicates that there are two different and entirely distinct pathways by which sodium and (potassium ions can cross the membranes of nerve and muscle fibres—the excitability mechanism and the pump (or recovery) mechanism. The two types of channel for the passage of cations exist side by side in the membrane, but as can be ...
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Biomimetic ion transport: on the mechanism of ion transport by an artificial ion channel mimic
Canadian Journal of Chemistry, 1990The influx of cations into vesicles mediated by a synthetic transporter is coupled to proton efflux and may be quantified by a pH-stat technique. The dependence of the transport upon cation type and concentration, upon transporter concentration, and upon temperature has been examined. The synthetic transporter is closely similar to the natural channel
Thomas M. Fyles +2 more
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Ion Transport in Nanofluidic Funnels
ACS Nano, 2010We report fabrication of nanofluidic channels with asymmetric features (e.g., funnels) that were cast in high modulus poly(dimethylsiloxane) and had well-defined geometries and dimensions. Masters used to cast the funnels were written in the negative tone resist SU-8 by electron beam lithography.
John M, Perry +3 more
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Ion Transport and Bacterial Toxins
Annals of Internal Medicine, 1967Excerpt The exact mechanisms by which bacterial toxins produce their effects are still poorly understood.
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Ion transport in nanofluidic channels
Chem. Soc. Rev., 2010In this tutorial review, recent developments in modeling and experimental studies on nanofludics were reported. Nanofluidic studies were categorized into two groups depending on the characteristic length scale. When the size of the nanochannels and pores is 5-100 nm, electrostatic interactions are dominant, and ion and fluid flow can be analyzed by ...
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Crosstalk and epithelial ion transport
Current Opinion in Nephrology and Hypertension, 1994Coordination of ion transport through channels, pumps, exchangers, and cotransporters (or crosstalk) is essential in preserving homeostasis of cell volume and ionic activities while maintaining an adapted response to fluctuations in hormonal and environmental challenges.
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