Figure 3

P _fhuA1 -controlled GFP expression induced by 2,2’-dipyridyl. A. GFP expression levels of E. coli Top10/p_tP_fhuA1 under the induction of different 2,2’-dipyridyl concentrations. OD₆₀₀ in the table represented the OD₆₀₀ value of cultures at 20 h post-induction. B. Time course analysis of GFP expression in E. coli Top10/p_tP_fhuA1 after induction with 200 μM 2,2’-dipyridyl. 2,2’-dipyridyl was added at 0 h. The error bars represent the standard deviation (SD) for one independent experiment, performed in triplicate, the experiment was repeated for three times.