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Membrane potential changes of E. coli O157:H7 after ultrasound treatments were expressed as the ratio of red and green fluorescence intensity (A). The extracellular K+ (B) and intracellular Ca2+ concentration (C) of E. coli O157:H7 during ultrasound exposure. Data were expressed as means ± standard deviation (n = 3). Different lowercase letters demonstrated a significant difference at P < 0.05.
