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Time course of 32P-phosphate influx in A. variabilis (cultivated on a total phosphorus content of 5 µmol·L−1) at different external concentrations. (A) 20 nM; (B) 100 nM; (C) 200 nM; (D) 500 nM; (E) 1 µM. For the measurement the original suspension was diluted 500-fold to ensure that the uptake process did not alter the external concentration.
