FIG. 6.

Quantification of bacteria in biofilm formed on polypropylene plastic by wild-type and mutant strains of P. ananatis SK-1. Biofilms were allowed to form in a 96-well polypropylene microtiter dish, stained with crystal violet, and estimated by analysis at 570-nm absorbance. Six wells of each sample were used for measuring biofilm formation, and error bars indicate standard deviations.