Q beta and Q gamma components of intramembranous charge movement in frog cut twitch fibers.
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چکیده
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Q beta and Q gamma components of intramembranous charge movement in frog cut twitch fibers
Intramembranous charge movement was measured in frog cut twitch fibers mounted in a double Vaseline-gap chamber with a TEA.Cl solution at 13-14 degrees C in the central pool. When a fiber was depolarized from a holding potential of -90 mV to a potential near -60 mV, the current from intramembranous charge movement was outward in direction and had an early, rapid component and a late, more slowl...
متن کاملEffects of conditioning depolarization and repetitive stimulation on Q beta and Q gamma charge components in frog cut twitch fibers
Charge movement was measured in frog cut twitch fibers with the double Vaseline-gap technique. Steady-state inactivation of charge movement was studied by changing the holding potential from -90 mV to a level ranging from -70 to -30 mV. Q beta and Q gamma at each holding potential were separated by fitting the Q-V plot with a sum of two Boltzmann distribution functions. At -70 mV Q beta and Q g...
متن کاملIntramembranous charge movement in frog cut twitch fibers mounted in a double vaseline-gap chamber
Intramembranous charge movement was measured in cut twitch fibers mounted in a double Vaseline-gap chamber with either a tetraethylammonium chloride (TEA.Cl) or a TEA2.SO4 solution (13-14 degrees C) in the central pool. Charge vs. voltage data were fitted by a single two-state Boltzmann distribution function. The average values of V (the voltage at which steady-state charge is equally distribut...
متن کاملSeparation of Q beta and Q gamma charge components in frog cut twitch fibers with tetracaine. Critical comparison with other methods
Charge movement was measured in frog cut twitch fibers with the double Vaseline-gap technique. 25 microM tetracaine had very little effect on the maximum amounts of Q beta and Q gamma but slowed the kinetics of the I gamma humps in the ON segments of TEST-minus-CONTROL current traces, giving rise to biphasic transients in the difference traces. This concentration of tetracaine also shifted V ga...
متن کاملIntramembranous Charge Movement in Frog Cut Twitch Fibers Mounted in a Double Vaseline-Gap Chamber
In t ramembranous charge movement was measured in cut twitch fibers mounted in a double Vaseline-gap chamber with ei ther a tetraethylammonium chloride (TEA.CI) o r a TEA2.SO 4 solution (13-14~ in the central pool. Charge vs. voltage data were fitted by a single two-state Boltzmann distr ibution function. The average values of V (the voltage at which steady-state charge is equally distr ibuted ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1991
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.98.3.429