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Journal of Experimental Biology 54,269-274 (1971)
Published by Company of Biologists 1971

Active Transport of Sodium by the Isolated Midgut of Hyalophora Cecropia

W. R. HARVEY ¹ and K. ZERAHN ²

¹ Department of Biology, Temple University, Philadelphia, Pennsylvania
² Department of Biology, Temple University, Philadelphia, Pennsylvania; Institute of Biological Chemistry, Copenhagen, Denmark

1. Sodium and lithium are actively transported by the isolated midgut of Hyalophora cecropia.

2. The short-circuit current in 32 mM sodium solution is about half of that in 32 mM potassium solution.

3. The sodium flux measured with ²²Na from blood-side to lumen accounts for all of the short-circuit current and is 19 times the flux from lumen to blood-side.

4. In a solution containing 16 mM potassium and 16 mM sodium there is no transport of sodium, although a large current remains.

5. The sodium transport mechanism is not sensitive to ouabain.