Figure 2
N 2 O accumulation in E. meliloti 1021 (WT) and the nosZ mutant incubated in MMN under 2% initial O 2 or anoxic conditions. N2O was measured in the headspace of the cultures after 18 and 36 h of incubation. The data represent the means with the standard deviations from at least two different cultures assayed in triplicate.