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The effects on the potential difference across isolated frog skin (R. catesbeiana, R. pipiens) of changing the ionic composition of the bathing solutions have been examined. Estimates of mean values and precision are presented for the potential changes produced by substituting other alkali metal cations for Na at the outside border and for K at the inside border. In terms of ability to mimic Na at the outside border of bullfrog skin, the selectivity order is Li &gt; Rb, K, Cs; at the outside border of leopard frog skin, Li &gt; Cs, K, Rb. In terms of ability to mimic K at the inside border of bullfrog and leopard frog skin: Rb &gt; Cs &gt; Li &gt; Na. Orders of anion selectivity in terms of sensitivity of the potential for the outside border of bullfrog skin are Br &gt; Cl &gt; NO(3) &gt; I &gt; SO(4), isethionate and of leopard frog skin are Br, Cl &gt; I, NO(3), SO(4). An effect of the solution composition (ionic strength?) on the apparent Na-K selectivity of the outside border is described. The results of the investigation have been interpreted and discussed in terms of the application of the constant field equation to the Koefoed-Johnsen-Ussing frog skin model. These observations may be useful in constructing and testing models of biological ionic selectivity.

The Effects of Alkali Metal Cations and Common Anions on the Frog Skin Potential