Complex admittance of Na+ conduction in squid axon
- 1 March 1979
- journal article
- research article
- Published by Springer Nature in The Journal of Membrane Biology
- Vol. 50 (1), 43-63
- https://doi.org/10.1007/bf01868787
Abstract
The complex admittance,Y(p), of squid axon was measured (4-1000 Hz) during step voltage clamp to obtain linear data on Na+ conduction.Y(p) is used as a spectroscopic tool to identify Na+ and K+ conduction, which dominateY(p) at low frequencies and can be separated from each other and from the static capacitance. Na+ conduction is readily distinguishable from K+ conduction in that it produces a steady-state negative conductance. The admittance of the Na+ system can show an anomalous resonance or an antiresonance depending on whether the net shunt conductance is negative or positive. Use of the Na+ negative conductance to neutralize leakage yields a measurement of dielectric capacitance at low frequency. A 90o phase angle suggests that the capacitance is ideal.This publication has 24 references indexed in Scilit:
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