Figure 7.—

(A) Activity of an sdhB∷lac translational fusion in the wild type (SV5867) and in an ArcA⁻ derivative (SV5868), grown under aerobiosis (open histograms) and under microaerobiosis (solid histograms). β-Galactosidase activities are averages from five independent experiments. (B) Relative amounts of sdhA mRNA, normalized to ompA mRNA, in the wild type (LT2) and in an isogenic ArcA⁻ mutant (SV5067) grown under microaerobiosis. Data are averages and standard deviations from three independent experiments. (C) Activity of a traJ∷lac transcriptional fusion in FinO⁻, FinO⁻ SdhA⁻, and FinO⁻ SdhA⁻ ArcA⁻ backgrounds (SZ114, SV4914, and SZ116, respectively). β-Galactosidase activities are averages from five independent experiments. In A and C, histograms are as follows: open, aerobiosis; solid, microaerobiosis.