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- W1995232722 abstract "The kinetics of potassium conductance changes were determined in the voltage clamped frog node (Rana esculenta), as a function of conditioning prepotential. The conditioning potential duration varied from 1 to 50 ms and the amplitude between -60 and +130 mV (relative to rest). The conductance kinetics were determined at a single test potential of +20 mV (depolarization) by means of the slope of log [ninfinity - nt] vs. time relationship which defines the time constant of the process (tau). The values of tau, after conditioning hyperpolarizations, were around 5 ms, up to 10 times greater than values obtained following a strong depolarization. The tau vs. pre-potential curve was sigmoid in shape. These differences were only slightly dependent on [K+]0 or conditioning pulse duration. The steady-state current values were also found to be a function of conditioning potential. After conditioning hyperpolarizations, the log [ninfinity - nt] vs. time curve could not be fitted by a single exponent regardless of the power of n chosen. The prepotential dependency of potassium current kinetics is inconsistent with the Hodgkin-Huxley axon model where the conductance parameters are assumed to be in either one of two possible states, and where the rate of transfer from one state to the other follows first order kinetics. In contrast the described kinetics may be consistent with complex multistate potassium channel models or membranes consisting of a number of types of channels." @default.
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- W1995232722 date "1976-03-01" @default.
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- W1995232722 title "Effect of conditioning potential on potassium current kinetics in the frog node" @default.
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- W1995232722 doi "https://doi.org/10.1016/s0006-3495(76)85686-x" @default.
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