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Denitrification in the presence of both 15N-labeled nitrite and nonlabeled N2O by P. denitrificans (A) and strain TR2 (B) under initially microaerobic (3% O2) conditions. Denitrifiers were incubated with 10 mM Na15NO2 and 2.5 mmol liter−1 14N2O. Symbols: closed triangles, 14N2O; open triangles, 15N2O; open circles, 15N2; gray circles, O2. Other conditions are the same as in Fig. 2.
