Results 251 to 260 of about 3,526,732 (300)
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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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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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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 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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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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Regulation of ion transport by oxidants
American Journal of Physiology-Lung Cellular and Molecular Physiology, 2013Ion channels perform a variety of cellular functions in lung epithelia. Oxidant- and antioxidant-mediated mechanisms (that is, redox regulation) of ion channels are areas of intense research. Significant progress has been made in our understanding of redox regulation of ion channels since the last Experimental Biology report in 2003.
Charles A, Downs, My N, Helms
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Ion transport in the endolymphatic space
American Journal of Otolaryngology, 1982The endolymph differs from all other extracellular fluids in its positive potential and in the ionic compositions in the various parts of the endolymphatic space. The endolymphatic space is surrounded by a tight neuroepithelium. The strial cells, which have a negative intracellular potential of -67 mV, generate a positive endolymphatic potential of +80
C, Morgenstern, H, Amano, A, Orsulakova
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Stability of electrophoretic transport of ions
Physical Review E, 2015We present an investigation of instability during electrophoretic transport of ions in a class of electrolytes called oscillating electrolytes. We analyze the onset of instability in electrophoretic transport in a binary electrolyte by modeling growth of small concentration disturbances over a base state with uniform acid and base concentrations.
Prateek, Gupta, Supreet Singh, Bahga
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Electrocoupling of ion transporters in plants
The Journal of Membrane Biology, 1993In the plasmalemma of plants, the major ion transporters are voltage gated. Hence, they are intrinsically coupled via the membrane voltage. Theoretical predictions and electrophysiological recordings on guard cells demonstrate nonlinear oscillations of a dynamic system which provides long-term osmotic adjustment by switching between periods of net ...
D, Gradmann, M R, Blatt, G, Thiel
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