Abstract
The appearance of nitrate and nitrite reductase activity in cell suspensions obtained from cells of Bacillus Cereus growing anaerobically in the presence of monovalent inorganic anions has been compared. The biosynthesis of both enzymes was induced by the following anion in decreasing order of effectiveness: nitrate, nitrite, azide, cyanate, iodide, thiocyanate, perrhenate and selenocyanate. All the anions tested are competitive inhibitors of nitrate reductase with respect to nitrate (with the exception of iodide), but have no affinity for nitrite reductase, because they fail to inhibit nitrite reduction in cell-free extracts. The results obtained are interpreted as an example of coordinate induction.
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