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Ammonia oxidation and isotopic signature of NH4+ and NO2– of a marine (N. adriaticus NF5 enrichment culture) and a soil (N. viennensis EN76) AOA. (A–C) Time course of NH4+ oxidation to NO2–. (D–F) Isotopic composition of NH4+ and NO2– as a function of initial NH4+ oxidized. Some error bars are smaller than the symbol.
