Table I. Mean ± SD β-galactosidase activity (arbitrary units) from lacZ fused to the promoter regions of che operon 1 and che operon 2 in pUI523A under different growth conditions in wild-type strain WS8N.

Plasmid	Aerobic	Photosynthetic
None	7.6 ± 0.4	8.3 ± 0.8
pUI523A	8.1 ± 0.8	6.7 ± 0.2
Operon 1	25.1 ± 4.3	11.2 ± 0.9
Operon 1 reverse	7.0 ± 0.3	7.3 ± 0.3
Operon 2	485.6 ± 45.9	43.5 ± 8.0
Operon 2 reverse	6.6 ± 0.3	7.0 ± 0.3