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. 1960 May;43(5):971-80.
doi: 10.1085/jgp.43.5.971.

Liquid junction and membrane potentials of the squid giant axon

K S COLE, J W MOORE

Liquid junction and membrane potentials of the squid giant axon

K S COLE et al. J Gen Physiol. 1960 May.

Abstract

The potential differences across the squid giant axon membrane, as measured with a series of microcapillary electrodes filled with concentrations of KCl from 0.03 to 3.0 M or sea water, are consistent with a constant membrane potential and the liquid junction potentials calculated by the Henderson equation. The best value for the mobility of an organic univalent ion, such as isethionate, leads to a probably low, but not impossible, axoplasm specific resistance of 1.2 times sea water and to a liquid junction correction of 4 mv. for microelectrodes filled with 3 M KCl. The errors caused by the assumptions of proportional mixing, unity activity coefficients, and a negligible internal fixed charge cannot be estimated but the results suggest that the cumulative effect of them may not be serious.

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