Equilibrium calcium-calcium exchange in cardiac sarcolemmal vesicles.


Ca-Ca isotopic exchange activity in bovine cardiac sarcolemmal vesicles was measured under equilibrium conditions, i.e. where intra- and extravesicular media have identical compositions. The results demonstrate that the monovalent cations K+, Li+, and Rb+ stimulate the process of Ca-Ca exchange. The presence of monovalent cations increases the Vmax for this… (More)


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