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(a) Changes in ammonium and nitrite concentration during growth of strain C13 during batch growth on FWM with urea as nitrogen source; (b) changes in ammonium and nitrite concentrations and (c) semilogarithmic plots of nitrite (□), cell (▵) and amoA (◊) concentrations during growth on FWM with 2 mM ammonium chloride. Error bars are standard errors of means from triplicate cultures but are often smaller than the symbol size.
