FIG 7.
Effects of organic acids on the transcriptional activity of cckA. Shown are the β-glucuronidase activities of strain LC6 (ΔfleQ::Kanr ΔcckA::uidA-aad) grown with different carbon sources: Sistrom's minimal medium supplemented with 15 mM or 100 μM succinic acid (Sistrom's MM or 100 μM, respectively), Sistrom's minimal medium without succinic acid but supplemented with 0.2% Casamino Acids (casamino acids) or with 0.2% Casamino Acids (cas) and the indicated organic acid to a final concentration of 15 mM, or 0.6% glycerol (gly). Cultures were grown anaerobically in screw-cap tubes or aerobically (AER). Values are the means of three independent measurements. The standard deviation is also shown.