Theory of negative capacitance in membrane impedance measurements |
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Authors: | Jack M. Ferrier Jack Dainty Stephen M. Ross |
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Affiliation: | (1) MRC Group in Periodontal Physiology and Department of Botany, University of Toronto, M5S 1A8, Ontario, Canada |
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Abstract: | Summary Three possible explanations of the negative capacitance seen in theChara corallina membrane impedance are critically examined. These explanations are based on: (1) voltage-dependent channel kinetics; (2) electro-osmosis; and (3) extracellular negative capacitance. It is shown that the first two can produce negative capacitance only with parameters which differ by several orders of magnitude from measured values. The last mechanism can produce a very large magnitude negative capacitance, in the appropriate frequency range. Possible experimental tests are discussed. |
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Keywords: | Chara membrane impedance negative capacitance |
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