Electromotive force of Nitella membrane during excitation

概要

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Excitation of the Nitella membrane is analysed by assuming the membrane to be an electromotive force in series with a resistance, both being variables of time and of membrane potential. During step depolarization beyond a threshold, conductance and electromotive force increase transiently, finally reaching their respective steady state levels. The conductance increase peak is attained earlier than the peak for electromotive force increase. Whenever electromotive force increases beyond the level of clamped membrane potential, the ionic current flows inward. This is considered to be the origin of the apparent negative resistance characteristic of the excitable membrane. Anodal break response and spontaneous firing of Nitella membrane are also caused by transient increases in electromotive force and conductance irrespective of whether the membrane potential is being held at its resting level. The transient increase in electromotive force reflects changes, like a phase transition, occurring during excitation.
日本植物生理学会の論文