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Membrane thicknesses (PtP) determined by X-ray diffraction change with penicillin, sulbactam, and cholesterol concentrations. The Di22:1PC bilayers were mixed with penicillin (opened square) and sulbactam (opened circle) at molar ratios of 0, 1/50, 1/15, and 1/5 and with cholesterol (opened triangle) at molar ratios of 0, 1/50, 1/25, 1/15, 1/10, and 1/5. The error bars are determined from the average of more than three repeated measurements.
