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Factors concerned in the origin of concentration potentials across the skin of the frog

✍ Scribed by Sumwalt, Margaret ;Amberson, W. R. ;Michaelis, Eva

Publisher
Wiley (John Wiley & Sons)
Year
1933
Tongue
English
Weight
567 KB
Volume
4
Category
Article
ISSN
0095-9898

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✦ Synopsis

I n a study of the influence of acidity upon electrical phenomena across the frog's skin, Amberson and Klein ('28) observed that, with Na acetate buffers, there was an approximate agreement between the pH at which concentration potentials were reversed and the reversal point for electroendosmosis across the same skin. The electromotive reversal points were, however, usually slightly lower than those observed for electroendosmosis, and the discrepancy between the two values was occasionally as much as 0.2 of a pH unit.

More recently, one of us (Sumwalt, '33) has pointed out that the pH of reversal points for concentration potentials across the chorion of the Fundulus egg differs from salt to salt; but that, when a correction is applied for a diffusion potential, assumed to be present at full magnitude as if no membrane were involved, the reversal points become identical.

In a further attempt to analyze the influence of such a diffusion factor in membrane concentration potentials, we have reinvestigated the phenomena in the frog's skin. We are now able to show that the electromotive behavior of this material is not so completely dominated by membrane charge as Amberson and Klein supposed; but that a diffusion element 49 'Ventral skiii, contrary to a remark of Ambersoii aiid Klein ('28), generally gives larger concentration potentials than dorsal skin.

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