Influence of cations on the membrane potential of Chlorella fusca.

The influence of the chlorides of K, Na, Ca, Zn, Cd, Pb, and Ce on the membrane potential of Chlorella fusca (Shihira et Krauss) 211-8b, Göttingen, has been studied. The potential depended on the concentration of Na und K much less than predicted by the Goldman equation. The dependence on the concentrations of Ca, Zn, and Cd was qualitatively similar to that in the case of the alkali ions.

[Dependence of membrane potential of Chlorella fusca on pH, temperature and light].

The dependence on external parameters of the membrane potential of Chlorella fusca (Shihira et Krauss) 211-8b, Göttingen, has been measured in media containing no salt except KCl. Near neutrality the potential is practically independent of pH. The negative potential increases with temperature from-12 mV at 5°CC to-45 mV at 20°, and remains constant thereafter, i.