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Change in bacterial (a, c E. coli: b, d S. aureus) Zeta potential and membrane permeability (assayed by NPN uptake) in presence of different concentrations of CTAB (a, b) and polymyxin B (c, d). Percentage change in Zeta potential (solid lines) and percentage change in permeability (dashed lines) was plotted against the concentration (µg/ml) of the treatment
