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The impedance of one cubic centimeter of living tissues of potato and guineapig were measured from 500 Hz to 3 MHz. In general, the magnitude of theimpedance was found to monotonically decrease with increasing frequency. Thisimplies that the membrane of each cell in the tissue acts like a capacitor,which is in parallel with a membrane resistance. The membrane resistance andcapacitance together are in series with a protoplasm resistance.Experimentally, it was observed that after the guinea pig died, the membraneresistance of its muscle decreased from 1.49 to 0.79 kilo-ohm while theprotoplasm resistance remained around 0.11 kilo-ohm. By contrast, when thepotato started to germinate, the protoplasm resistance decreased from 0.25 to0.10 kilo-ohm, while its membrane resistance remained around 4 kilo-ohms.

A translation of Maurice Philippson's "Principles of the Electrical Resistance of Living Tissue"