Fig. 8.

Induction of ydcI expression results in S. Typhimurium biofilm formation. (A) S. Typhimurium strain χ3339 containing either pBAD18 or pBAD18+ydcI was grown in the presence of arabinose for approximately 16 h in LB medium. The white arrow indicates significant biofilm accumulation at the medium-air interface. The upper and lower panels show culture appearance and crystal violet-stained flasks (with cultures removed), respectively. (B) The same as panel A, except that strain χ3339 containing pBAD18+lacZ was tested.