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Anomalous permeabilities of the egg cell membrane of a starfish in K+-Tl+ mixtures.

Anomalous permeabilities of the egg cell membrane of a starfish in K+-Tl+ mixtures. From the Department of Physiology and the Brain Research Institute, University of California at Los Angeles, Los Angeles, California 90024 A B S T R A C T T h e electrical properties o f "inward" rectifying egg cell m e m b r a n e s of the starfish Mediastera aequalis have been studied in the presence o f K+-TI + mixtures. When the ratio o f the external concentrations o f these ions is changed while their sum is kept constant, both the conductance and the zero-current m e m b r a n e potential go t h r o u g h a minimum, showing clear discrepancies from theoretical results based on conventional electrodiffusion models (e.g., Goldman's equation). By contrast, when the ratio o f the two concentrations is fixed and their sum varied, the potential follows an ideal Nernst slope, consistent with Goldman's equation. T h e m e m b r a n e conductance which, according to previous studies on similar membranes, is to be viewed as a function o f the displacement o f the m e m b r a n e potential from its resting value AV, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of General Physiology Rockefeller University Press

Anomalous permeabilities of the egg cell membrane of a starfish in K+-Tl+ mixtures.

S Hagiwara; S Miyazaki; S Krasne; S Ciani
The Journal of General Physiology , Volume 70 (3): 269 – Sep 1, 1977
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Publisher
Rockefeller University Press
Copyright
Copyright © 1977 by The Rockefeller University Press
ISSN
0022-1295
eISSN
1540-7748
DOI
10.1085/jgp.70.3.269
Publisher site
See Article on Publisher Site

Abstract

From the Department of Physiology and the Brain Research Institute, University of California at Los Angeles, Los Angeles, California 90024 A B S T R A C T T h e electrical properties o f "inward" rectifying egg cell m e m b r a n e s of the starfish Mediastera aequalis have been studied in the presence o f K+-TI + mixtures. When the ratio o f the external concentrations o f these ions is changed while their sum is kept constant, both the conductance and the zero-current m e m b r a n e potential go t h r o u g h a minimum, showing clear discrepancies from theoretical results based on conventional electrodiffusion models (e.g., Goldman's equation). By contrast, when the ratio o f the two concentrations is fixed and their sum varied, the potential follows an ideal Nernst slope, consistent with Goldman's equation. T h e m e m b r a n e conductance which, according to previous studies on similar membranes, is to be viewed as a function o f the displacement o f the m e m b r a n e potential from its resting value AV,

Journal

The Journal of General Physiology – Rockefeller University Press

Published: Sep 1, 1977

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