Immediate alterations of membrane potential and membrane resistance, measured with microelectrodes and clamped current impulses, were induced in Nitella cells by exposure rates from 6 to 120 kR/minute and exposures above 20 kR. The membrane resistance decreased simultaneously with the first wave of depolarization. Thirty kR/minute stimulated action potentials in the majority of investigated internodes. An initially increased chloride permeability is probably responsible for these effects. Radiation reduced the temperature coefficient of the membrane resistance. This might be linked to effects on the active transport systems.

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