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salicylate system

We cultivate the recevier E.coli until the OD up to 0.4 and add salicylateinto 16 EP tube containing aforementioned E.coli respectively. Different concentration of salicylate solution will be added, that is 10-7 M, 10-6 M, 5×10-6 M, 10-5 M, 2.5×10-5 M, 5×10-5 M, 7.5×10-5 M, 10-4 M, 2.5×10-4 M, 5×10-4 M, 7.5×10-4 M, 10-3 M. Cultivate the cell for 3 hours at 37℃. Then centrifuged cells and resuspended in phosphate buffer solution (PBS). The GFP fluorescence of each culture was obtained using FCM(flow cytometry). The result is shown in figure 1.

Figure 1. Dose response curve. Horizontal axis represents GFP expression measured by flow cytometry and the vertical axis represen different salicylate concentration. Data was fitted with Hill function.