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. 2012 Feb;158(Pt 2):353–367. doi: 10.1099/mic.0.053371-0

Fig. 9.

Fig. 9.

Serum enhances expression of pvdS in medium lacking iron. Cells were grown as described in Fig. 1 and inoculated into MM9 (chemically defined totally iron-deficient medium), MM9/AHS, MM9/H-AD or MM9/apoTF (200 µg apotransferrin ml−1). Cultures were incubated at 37 °C with shaking at 230 r.p.m. for 14 h and the level of β-galactosidase activity was determined. Values represent the means±sem of three independent experiments. Statistical significance was determined by one-way ANOVA with Tukey’s post test. ***, P<0.001; ns, no significant difference.