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Activities of the ytfE, hmpA, ygbA, and tehA promoters in yjeB+ (a) and ΔyjeB (b) strains. Cultures were grown aerobically (solid and striped bars) and anaerobically (open and stippled bars) and were treated with 0.05 mM Spermine NONOate (striped bars) or 5 mM nitrite (stippled bars) 90 to 120 min prior to assay for β-galactosidase. Units of activity are as defined by Miller (26).
