[Contribution of divalent cations to the maintenance of membrane potentials in the oocytes of Pleurodeles waltlii Michah (Amphibia, Urodela)].
C R Acad Hebd Seances Acad Sci D, 1978/5/08;286(18):1319-22.
PMID: 96993
Abstract
When the external concentration of Ca and Mg is changed, the oocyte membrane potential, in the Urodela Amphibian: Pleurodeles waltlii, is not significantly modified. The addition of chelator agents, EGTA and EDTA in Ca, Mg free Steinberg solution promotes a membrane depolarisation and the rise of membrane conductance. It is concluded that divalent ions Ca++ and Mg++ are needed to maintain a potential difference between internal and external medium of the oocyte.
MeSH terms
Animals; Barium; Calcium; Cations, Divalent; Edetic Acid; Egtazic Acid; Female; Magnesium; Membrane Potentials; Oocytes; Ovum; Salamandridae; Strontium
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