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The Journal of General Physiology, Vol 49, 469-481, Copyright © 1966 by The Rockefeller University Press

ARTICLE

Cation Transport in Escherichia coli

VI. K exchange



Wolfgang Epstein 1 and Stanley G. Schultz 1

1 From the Biophysical Laboratory, Harvard Medical School, Boston

K influx and net K flux have been measured in suspensions of chloramphenicol-arrested Escherichia coli. The rate of K exchange in the steady state was independent of the K concentration of the medium over a 200-fold range. Under a number of experimental conditions the rate of exchange may be considerably increased or decreased without changing the cellular K content. These results show that under these conditions changes in K influx are associated with equal changes in K efflux, and suggest that the latter process is, at least in part, both carrier-mediated and tightly coupled to the influx process.

Submitted on July 2, 1965


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