Membrane potential differences in Chara australis

Abstract

The observa-tions of Hope and Walker (1961) on the electric potential difference between the cytoplasm of cells of Chara australis and the external medium, when the ionic composition of the latter was varied, are considered in relation to a chloride, or sodium, pump with passive diffusion of potassium, sodium and chloride. The observations agree, at least, as well with such a system as they do with the system suggested by Hope and Walker, which is restricted to passive diffusion of potassium and sodium.