Abstract
R. J. PUMPHREY, in a careful investigation,1 has found constant electrical potential differences across epidermis stripped from the bulb scales of onions when this membrane separated unlike solutions of electrolytes. We, on the other hand, had previously observed under similar conditions potential differences which changed with time.2 Pumphrey offers the suggestion that the fall in potential difference in our experiments was due to diffusion of salt from the KCl bridges used to connect the calomel half-cells with the solutions bathing the membrane.
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References
Pumphrey, R. J., Proc. Roy. Soc., B, 109, 434, 1932.
Brooks, S. C., A. C. Giese and R. I. Giese, J. Exp. Biol., B, 8, 124, 1931.
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GIESE, A., GIESE, R. & BROOKS, S. Electrical Potential Differences across Onion Epidermis. Nature 129, 724–725 (1932). https://doi.org/10.1038/129724d0
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DOI: https://doi.org/10.1038/129724d0
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