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Quantification of the crystal violet dye retained in the biofilm formed by D. alaskensis cells on carbon steel coupons. The effect of the antimicrobial substance (AMS) on biofilm formation (A) and on biofilm stability (B) is shown. The values are expressed as a ratio of the optical densities of 580 and 600. The coupons treated with AMS are shown in the left of each graphic.
