Abstract

The binding of exogenous bivalent and univalent cations by the yeast cell is rapid and reversible, obeying a simple mass-law equation. Bivalent cations, especially UO 2++, are bound more firmly than are univalent cations. There are at least two species of binding sites, tentatively identified as phosphoryl and carboxyl groups. These are located at the periphery of the cell, isolated from endogenous cations by a permeability barrier.

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