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β-Galactosidase activities in R. sphaeroides strains containing either the hemZ::lacZ or hemN::lacZ transcriptional fusion plasmid. The wild-type (2.4.1) and fnrL-minus (FNRL) strains were grown aerobically (30% oxygen, black bars) to an OD600 of 0.3 to 0.4 or semiaerobically (2% oxygen, gray bars) to an OD600 of 0.4 to 0.5. All values provided are the averages of two independent determinations. Vertical bars represent the standard deviations from the mean.
