Fig 2.

Expression of ald in the M. smegmatis ΔdevR strain exposed to various conditions. The M. smegmatis ΔdevR strain, carrying the ald::lacZ transcriptional fusion plasmid pALDLACZ, was grown either aerobically (control), under hypoxic conditions for 10 h (hypoxia), or exposed to various conditions as described in Materials and Methods. Cell-free crude extracts were used to determine β-galactosidase activity. The β-galactosidase activity is expressed as nanomoles per minute per milligram of protein. All values provided are the averages of the results from two independent determinations. Error bars indicate the deviations from the means.