Maximum arsenite-oxidizing activity of a pseudomonad (Ps. arsenoxydansquinque) isolated from "oxidized" arsenical cattle-dipping fluids was found in cells 3-4 days old, when cultivated in a synthetic medium containing arsenite. The system is adaptive, cells cultivated in the absence of arsenite showing no arsenite-oxidizing activity.
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Turner et al. (1954) studied this question.