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Biophysical Journal 48: 125-136 (1985)
© 1985 the Biophysical Society

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An experimental comparison between the continuum and single jump descriptions of nonactin-mediated potassium transport through black lipid membranes.

C van Dijk and R de Levie

ABSTRACT

The continuum and single jump treatments of ion transport through black lipid membranes predict experimentally distinguishable results, even when the same mechanistic assumptions are made and the same potential-distance profile is used. On the basis of steady-state current-voltage curves for nonactin-mediated transport of potassium ions, we find that the continuum model describes the data accurately, whereas the single jump model fails to do so, for all cases investigated in which capacitance measurements indicate that the membrane thickness varies little with applied potential.






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Copyright © 1985 by the Biophysical Society.