FIG. 1.
N2 production by S. antibioticus B-546 under aerobic conditions. Flask headspace was filled with air to initially maintain aerobic conditions. (A) Amounts of NO3− (solid circles) and NO2− (open circles) in medium and O2 in the gas phase (solid squares) were determined at indicated times. (B) Amounts of 14N15N (solid circles), 15N15N (open circles), and N2O (solid squares) in the gas phase were determined at indicated times. (C) Cell growth. Results are representative values from three experiments.