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NO3− reduction monitored in 100-ml batch cultures (prepared in sealed 160-ml serum bottles with headspace consisting of 90% N2 and 10% C2H2). (A) Aeromonas sp. DNRA1; (B) Bacillus sp. DNRA2; (C) Citrobacter sp. DNRA3; (D) Shewanella sp. DNRA4; (E) Enterobacter sp. DNRA5; (F) Klebsiella sp. DNRA6. The average values from biological replicates (n = 3) are presented, with error bars representing the standard deviations (●, NO3−; ○, NO2−; ▲, NH4+; ▵, N2O-N).
