Active Transport through Animal Cell Membranes by P.G. LeFevre

By P.G. LeFevre

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The human red cell frDm an external excess, and in the exit Df phDsphate into. , but failed at 3° c. 20 The additiDn Df glucDse enhanced the uptake Df phDsphate, which was given up again to. 'II et ai. (1940) obtained similar results in regard to the exchange of labelled phosphate, and suggested the transport had an enzymatic basis. 43 Transport of Inorganic Anions glycolysis, or when fluoride was added, the pattern being reminiscent of the behavior of K + in many glycolysing cells as described in the previous section.

Fluoride plus either malonate or azide also proved to be effective inhibitory combinations; but neither of the latter two agents assisted F- in inhibition of glucose oxidation. -MuLLINS (1942) showed that P32-phosphate uptake in yeast was closely associated with carbohydrate metabolism. With higher temperahIres and ample sugar supply, uptake was rapid and was little affected by anoxia. Like K +, the phosphate was later released to the medium as the metabolic activity subsided. Similarly, CALDWELL and HINSHELWOOD (1951) found that B.

D. without altering the Na+ flux or current, presumably by slightly depressing the passive CI- penetration; adrenal in and neurohypophyseal factors (from the whale) enhanced the flux and current considerably, and in parProtopiasmatoiogia VIII, 7, a 3 34 VIII, 7, a: P. G. LEFEVPE, Active Transport through Animal Cell Membranes allel " ; high CO 2 abolished the influx and current. In the examples in the table, no involvement of any ion other than Na+ in the active transfer need be suggested, except for the case of adrenalin stimulation.

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