The ionic permeability of the amphibian oocyte in the presence or absence of external calcium.

Animals Anura Calcium/pharmacology Cell Membrane Permeability Chlorides/metabolism Female Membrane Potentials Microelectrodes Ovum/analysis,drug effects,metabolism,physiology Potassium/analysis,metabolism Potassium Isotopes Rana pipiens Sodium/analysis,metabolism Sodium Isotopes

Chlorides Potassium Isotopes Sodium Isotopes Sodium Potassium Calcium