title: Experimental verification of an expected relation between time of incubation and magnitude of the fast and slow fractions of the sodium efflux from amphibian eggs.
abstract: The Na+ efflux curves of single ovarian eggs are separable into two fractions. The magnitude of the slow fraction increases slowly with time of exposure of the eggs to labeled Na+, long after the fast fraction has reached equilibrium. The data agree with the theory that the fast fraction is rate-limited by surface permeation and that the slow fraction is rate-limited by desorption from intracellular adsorption sites.
mesh_terms: D000818:Animals; D001001:Anura; D005260:Female; D006207:Half-Life; D066298:In Vitro Techniques; D010063:Ovum / Q000378:metabolism*; D011894:Rana pipiens; D012964:Sodium / Q000378:metabolism*; D013997:Time Factors
chemical_list: D012964:Sodium