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Biophysical Journal 13: 118-132 (1973)
© 1973 the Biophysical Society

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The Double Fixed Charge Membrane

Low Frequency Dielectric Dispersion

H. G. L. Coster

ABSTRACT

An analysis is made of the AC characteristics of a membrane consisting of two fixed charge regions of opposite sign, in contact. It is shown that the equivalent parallel capacitance and conductance of such a membrane undergo a strong dispersion at low frequencies. The dielectric dispersion is a result of polarization effects in the diffusion of coions in each of the two fixed charge lattices. This, at low frequencies, gives rise to a very large diffusion capacitance. The form of the dispersion characteristics is very similar to those observed for synthetic-fused anion-cation membranes and various cellular membranes.






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Copyright © 1973 by the Biophysical Society.