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Growth of β-lactam-susceptible Escherichia coli (RC85) cells in antibiotic-induced growth inhibition environment to evaluate the antibiotic consumption role of intact OMVs from RC85+ and isogenic mutant strains. The growth-inhibiting concentrations of β-lactam antibiotics were: ampicillin, 30 μg/mL; cefotaxime, 1.25 μg/mL; cefoperazone, 4 μg/mL; amoxicillin, 12 μg/mL; cefazolin, 8 μg/mL; cefalexin, 16 μg/mL. The data are presented as means and SEMs of three independent experiments.
