TABLE 2.

Bioluminescence response of the yhcRQP-luxCDABE gene fusion to pHBA^a

[pHBA], mM	Relative light units
	yhcS+	yhcS
0	0.631	0.815
1.6	6.72	1.02
3.1	10.2	1.16
6.2	16.2	1.42
12.5	30.8	1.82
25	66.6	1.59
50	91.7	0.614
100	0.437	0.045

^aE. coli strains MG1655 carrying pDEW655 and DPD2433 carrying pDEW655 were used. Log-phase cultures in LB medium were treated with the indicated concentrations of pHBA for 30 min.