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Voltage clamping induces resistance and current-voltage plot changes in frog gastric mucosa

Voltage clamping induces resistance and current-voltage plot changes in frog gastric mucosa

American Journal of Physiology 246(5 Pt 1): G574-G579

ISSN/ISBN: 0002-9513

PMID: 6609647

Changing the potential across the isolated frog gastric mucosa by voltage clamping changes the measured resistance of the tissue in two ways. An immediate change in resistance results from changing the measuring position on the nonlinear current-voltage (I-V) plot. Subsequent to this, the resistance changes slowly with a half-time of about 3 min, a change that is not predicted by a previous model for voltage transients and that implies slow changes in membrane resistance following changes in intracellular ion content. The I-V plot over the range examined shows three breakpoints; changing clamp voltage alters the position of two of these breakpoints as well as the slope of the connecting resistances. The central breakpoint agrees with the potential at zero current and varies with it as the clamp potential is changed, as predicted from a diode model for breakpoint generation.

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Accession: 018206636

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