The Use of Membrane Electrical Noise in the Study of Characean Electrophysiology

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Abstract
The technique of examining membrane properties through the use of endogenous electrical noise is applied to the study of Characean electrophysiology. The frequency band between 0·1 and 1·0 Hz is particularly sensitive to the metabolic state of the cell. It is concluded that measurements of the power spectral density function and the low frequency excess noise will prove a useful adjunct to the normal measurements of resting potential and membrane resistivity.