Figure 2

Time course of inorganic nitrogen species during anaerobic incubation of A. terreus isolate An-4 (Experiment 2). The isolate was pre-cultivated under oxic conditions with ¹⁵NO₃ ^- as the only source of NO₃ ^- and then exposed to anoxic conditions. Absolute amounts of (A) ¹⁵N-labeled NO₃ ^-, (B) total NO₂ ^-, total NH₄ ⁺, and total N₂O, and (C) ¹⁵N-labeled NH₄ ⁺ and N₂ in the incubation vials are shown. Means ± standard deviation (n = 3).