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Differential rate of Φ(nrfA-lacZ) expression. A culture of the λΦ(nrfA-lacZ) strain VJS3861 was grown anaerobically in MOPS-glucose medium supplemented with 5 mM nitrate. Samples were withdrawn and assayed for total β-galactosidase activity (▪) and nitrite concentration (⧫). OD600, optical density at 600 nm.
