Abstract
Chromatium vinosum contains an ATP-dependent K + uptake system which is light independent and sensitive to DCCD. Kinetic measurements show K m = 0.27 mM for K + and K m = 1.3 mM for Tl +, an alternate substrate. The internal K + content of the cell increases with increasing medium osmolality and is unaffected by changes in external K + concentration.
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