TABLE 3.

Aerobic and anaerobic β-galactosidase activity of Φ(adhE-lacZ)291 in the presence of 40 mM nitrate and a narL mutation^a

Strain	Relevant genotype	β-Galactosidase activity (Miller units)
		+O2	−O2	+NO3
				+O2	−O2
ECL4011	Φ(adhE-lacZ)291	312 ± 15	2,815 ± 49	129 ± 10	151 ± 29
ECL4033	Φ(adhE-lacZ)291 narL::Tn10	326 ± 23	3,153 ± 18	188 ± 25	2,993 ± 23

^aThe cells were grown in LB-glucose medium and assayed in the exponential phase of growth (OD₆₀₀, 0.4).