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SUMMARY When a culture of Bacillus licheniformis was shifted from aerobic to anaero- bic conditions, lysis occurred unless a fermentable carbon source or a system for nitrate respiration was present. Nitrate reductase was primarily induced by partial or complete anaerobiosis and partially repressed by glucose. The enzyme was repressed and inactivated by high oxygen concentrations. Respira- tion of bacteria grown anaerobically was 30 to 40 % of that of bacteria grown aerobically. Glucose decreased respiration of other substrates in both aero- bically and anaerobically grown organisms. No cytochrome a, was present after anaerobic growth. Cytochrome c, was repressed by glucose; under anaerobic conditions this repression was antagonized by nitrate.

The Influence of Oxygen, Glucose and Nitrate upon the Formation of Nitrate Reductase and the Respiratory System in Bacillus licheniformis