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(a) Electrochemical impedance spectra of E. coli O157:H7 at the concentrations of 101-105 CFU/mL in the pure cultures; (b) The impedance at the characteristic frequency of 10 kHz for different concentrations of E. coli O157:H7 ranging from 101 CFU/mL to 105 CFU/mL in the pure cultures (N=3); (c) Linear relationship between the impedance change and the concentration of E. coli ranging from 101 to 105 CFU/mL (N=3).
