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Journal of Experimental Biology 78,105-120 (1979)
Published by Company of Biologists 1979

Transport of Thallium Ions Across the Isolated Midgut of Hyalophora Cecropia

KARL ZERAHN 1 and BODIL KOEFOED 1

1 Institute of Biological Chemistry A, University of Copenhagen, Denmark and University Institute of Pathology, Hospital of Odense

Tl+ permeates the Hyalophora cecropia midgut equally in both directions, but the flux of Tl+ per mm is up to 50 times higher than the passive flux for potassium, rubidium and caesium. This is explained by assuming that the Tl+ flux is a carrier-mediated facilitated diffusion or a passage through channels similar to gramicidin channels in black membranes. We have found this special way for Tl+ to pass through membranes in the Hyalophora cecropia midgut; some other membranes, such as red blood cells, seem to show the same properties, but others, such as frog muscle and skin, do not.

Submitted on March 31, 1978






© The Company of Biologists Ltd 1979