Calcium and Electric Potential across the Clam Mantle

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Science  11 Mar 1960:
Vol. 131, Issue 3402, pp. 735
DOI: 10.1126/science.131.3402.735-a


An excised clam mantle develops a potential difference, shell side positive, when both surfaces are bathed by tap water or physiological saline solution. The magnitude and sign of the potential are sensitive to the calcium concentration in the bath solution. Bubbling carbon dioxide through the solution bathing the shell side increased the potential.

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