Genetic basis for denitrification in Ensifer meliloti

BMC Microbiology

Table 2 The methyl viologen-dependent (MV ⁺ ) nitrate reductase (MV ⁺ -NR), nitrite reductase (MV ⁺ -Nir) and nitric oxide reductase (Nor) activities of E. meliloti 1021 (WT) and the napA, nirK , and norC mutant strains incubated in MMN under 2% initial O ₂ or anoxic conditions

^aMV⁺-NR and ^bMV⁺-Nir activities are expressed as nmol NO₂ ^- produced or consumed · mg protein^-1 · min^-1. Nor activity is expressed as nmol NO consumed · mg protein^-1 · min^-1. All of the activities were determined after incubation for 18 h. The data are expressed as the means with the standard error in parentheses from at least two different cultures assayed in triplicate. -, not determined; n.d., not detectable.

ISSN: 1471-2180