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Growth phase regulation of the cai and fix operons. Strain NM522 harboring either plasmid pAB20 (caiT-lacZ) (A) or plasmid pAB30 (fixA-lacZ) (B) was grown anaerobically at 30°C in LB supplemented with 1 μM sodium molybdate, 1 μM sodium selenite, and 20 mM dl-carnitine. Cell samples were collected for measurement of optical density (OD) and for determination of β-galactosidase specific activity.
