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Quantification of biofilm formation in A. baumannii strains on plastic surface. To determine total cell mass the OD600 was measured after the cultures were briefly sonicated to resuspend most of the cells. The OD580 was measured after the stained tubes were incubated with ethanol-acetone. The error bar show the S.D. ***,p < 0.0001 using Student’s t-test comparing mutant and wild-type strains.
