Abstract
Batch cultures ofPseudomonas aeruginosa were able to produce only low levels of cyanide during logarithmic growth with adequate aeration. The reduction of aeration caused a rapid increase in the ability of such cultures to produce hydrogen cyanide. The immediacy and the magnitude of this response depended on the oxygen level, with a concentration of 4% in the aeration gas giving optimal results. The reestablishment of normal aeration resulted in a cessation of the increase of the culture's cyanogenic capacity. This effect appeared to be a combination of inactivation of the hydrogen cyanide synthase and repression of synthesis of this enzyme.
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