Uptake by Yeast: Interaction of Rb+, Na+ and Phosphate |
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| Authors: | G. W. F. H. BORST-PAUWELS A. P. R. THEUVENET P. H. J. PETERS |
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| Affiliation: | Laboratory of Chemical Cytology, University of Nijmegen, Toernooiveld, Nijmegen, The Netherlands |
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| Abstract: | It has been shown that addition of phosphate to phosphate deficient yeast gives rise to an immediate increase in the rate of Na+ uptake and an immediate decrease in the rate of Rb+ uptake. In addition, phosphate uptake is enhanced specifically by Na ions presumably by a process with a very high affinity for phosphate with a Km of about 2 × 10−6M at pH 7.2, whereas the Km for phosphate uptake of the Na+ independent process amounts to 1.3 × 10−4M. |
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