ISSN:
1432-1424
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
Summary Voltage clamp studies show that the wild-type membrane ofParamecium tetraurelia contains a conductance component which is sensitive to hyperpolarization. This component manifests itself as “anomalous”, or “inward going”, rectification of membrane voltage in response to applied constant current pulses and as a “hyperpolarizing spike” when no K is added to the external solution (Y. Satow, C. Kung, 1977.J. Comp. Physiol. 119∶99). Like the conductances which underlie anomalous rectification in other cells, the hyperpolarization-sensitive conductance inParamecium is specific for K, and the magnitude of the voltage-dependent conductance change depends not only on voltage but also on external potassium concentration. The internal potassium ion concentration ofParamecium is calculated to be between 17 and 18mm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01933477
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