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Experiment 2. 15N-N2O production and isotope composition under different 15NH4+ 14NO2− ratios. (A) 45N2O (single labeled) and 46N2O (double labeled) production rate under different 15NH4+ and 14NO2− concentrations (normalized to per cell per day). All of the 45N2O represents hybrid formation. (B) Regression between 45N2O: 46N2O production rate against 15NH4+ 14NO2− concentration ratio. Error bars represent SD from triplicate samples.
