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. 2013 Nov 4;110(47):18994–18999. doi: 10.1073/pnas.1310488110

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Fig. 1. — Anammox stoichiometry and natural abundance isotope fractionation. (A) Consumption of ammonium and nitrite and production of nitrate agree with anammox stoichiometry (Exp. C₃_a). (B) Ammonium N isotope fractionation follows closed-system Rayleigh kinetics (Exp. C₃_b). (C) The NO_x N isotope fractionation is influenced by isotope exchange between nitrite and nitrate (gray area), which is superimposed on kinetic isotope effects (Exp. C₃_a). The x-axis labels and refer to the fraction of remaining nitrite and ammonium, respectively. Symbols represent data, lines are modeled trends, and the concentration and isotope composition of N₂ was calculated from NO_x.

Inline graphic — Anammox stoichiometry and natural abundance isotope fractionation. (A) Consumption of ammonium and nitrite and production of nitrate agree with anammox stoichiometry (Exp. C₃_a). (B) Ammonium N isotope fractionation follows closed-system Rayleigh kinetics (Exp. C₃_b). (C) The NO_x N isotope fractionation is influenced by isotope exchange between nitrite and nitrate (gray area), which is superimposed on kinetic isotope effects (Exp. C₃_a). The x-axis labels and refer to the fraction of remaining nitrite and ammonium, respectively. Symbols represent data, lines are modeled trends, and the concentration and isotope composition of N₂ was calculated from NO_x.