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. 2018 Nov 16;9:2674. doi: 10.3389/fmicb.2018.02674

FIGURE 2.

FIGURE 2

β-galactosidase activity of Campylobacter jejuni WT carrying Ptlp2-lacZ transcriptional fusion construct. (A) β-galactosidase activity in the absence (uninduced) and presence of 40 μM FeSO4 or FeCl3(H2O)6 (induced) added to MEM-α. (B) β-galactosidase activity in the absence (uninduced) and presence of 2mM Pi (induced) added to MOPS. (C) β-galactosidase activity of the Ptlp2-lacZ fusion assays in the Δtlp2::Cm mutant in the presence or absence of 40 μM FeSO4 in MEM-α and in the presence or absence of 2mM Pi in MOPS. (D) β-galactosidase activity of the Ptlp2-lacZ fusion in the Δfur mutant in MEM-α. The cells were incubated for 8 h before carrying out the assay. The results show the means and standard deviations of three independent experiments. ∗P < 0.05 where each group is compared with the WT reporter strain that is not induced (MEM-α or MOPS) and ∗∗P < 0.05 where each group is compared with the WT that is induced (with FeSO4 or Pi).