Thermal anomalies in ion distribution in rat kidney slices and in a model system

Abstract

SUMMARY 1. Both a porous silica gel and thin cortical slices of the kidneys of rats showed highly anomalous temperature dependence of selectivity for K + relative to Na + . 2. Maxima occurred at about 15°C, 30°C, 45°C and 60°C in the gel, and at about 15°C and 28°C in kidney slices. 3. It is suggested that since the anomalies resemble Drost‐Hansen anomalies, they are consistent with the proposal that both in the model silica gel system and in rat kidney slices ion distribution might be determined to some extent by a difference in solvent properties between interfacial and bulk phase water.