FIG. 2.
Biofilm formation by S. enterica swarming mutants. Growth conditions were as described in the legend to Fig. 1. The OD630 of all samples was approximately 0.2. Arrow points to biofilm levels (OD550) of wild-type SJW1103, and arrowheads point to those of mutants not affected in swarming. The data are means of triplicate samples monitored on the same day. There was a significant variation in the absolute biofilm values of samples processed on different days, but the relative values with respect to the wild-type value were very reproducible.