Fig 4.

Kinetics of biofilm formation by cat1-E mutant cultures grown in MM at 4, 10, and 22°C. (A) Biofilm formation following 24 h of incubation at 22°C in MM supplemented with 1 or 3% sea salts. (B) Quantification of biofilm formation, represented by crystal violet absorbance at 550 nm. The cat1-E transposon mutant is unable to form a biofilm equivalent to that of the wild type over an extended time frame. Biofilm formation by wild-type P. arcticus at 22°C is represented by the top line with circles. Error bars represent standard deviations. n = 4.