Fig. 5.

Experiment 4. ¹⁵N-N₂O production from NH₂OH. ^l5N labeled N₂O production rate from (A) viable cells with ¹⁵NO₂⁻ tracer (10 μmol L⁻¹); (B) viable cells with ¹⁵NO₂⁻ (10 μmol L⁻¹) + ¹⁴NH₂OH (1 μmol L⁻¹); (C) filtrate with ¹⁵NO₂⁻ (10 μmol L⁻¹) + ¹⁴NH₂OH (1 μmol L⁻¹); (D) viable cells with ¹⁵NH₂OH (1 μmol L⁻¹) + ¹⁴NO₂⁻ (50 μmol L⁻¹); (E) filtrate with ¹⁵NH₂OH (1 μmol L⁻¹) + ¹⁴NO₂⁻ (50 μmol L⁻¹). Error bars represent SD from triplicate samples.