FIG. 6.

Spectral analysis of crude membrane fractions from cultures grown aerobically (A) or anaerobically (B). SB1003 is the wild-type strain, SD01 is the regB knockout strain, and SD01-M52 and SD01-M08 are mutant strains harboring mutations in the promoter region of the senC-regA-hvrA operon. Each scan was performed on the same cell mass, as determined by spectral analysis at 660 nm.