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Regulation of ompF transcription by cell density. Cultures were grown with a range of input glucose concentrations establishing the steady-state densities in the chemostat cultures. (A) ompF expression of strain MH513 as measured from the activity of the ompF-lacZ transcriptional fusion; (B) fusion activity in strain BW3323 mutated in rpoS; (C) fusion activity in strain BW3305 mutated in hns. All cultures were grown under glucose limitation at a dilution rate of 0.3 h−1.
