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Biophysical Journal 12: 587-596 (1972)
© 1972 the Biophysical Society

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The Transient Response and Impedance Locus of a Mobile Site Membrane

John Sandblom, John L. Walker, Jr. and George Eisenman

ABSTRACT

The kinetic properties of a mobile site membrane are analyzed theoretically and the results are compared with experimental data obtained from a simple model system. In the model system the measured response to a step change in electric current is a single relaxation process, in excellent agreement with the theoretically predicted behavior. To this relaxation process corresponds an anomalous capacitance whose properties are obtained by performing a frequency analysis of the system. By plotting the impedance locus of this mobile site membrane, the locus is shown to exhibit a 45° phase angle at high frequencies, a phenomenon which is generally associated with depletion layers.






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Copyright © 1972 by the Biophysical Society.