FIG. 9.

Acid tolerance of fur mutant in the presence of FeCl₃. The wild type (⋄) and HLM101 grown in LBS (pH 7.5) were transited to PBS (pH 7.5) (A) and SCBN (pH 5.0) (B). FeCl₃ was added to the buffer; none (□), 20 (▵), and 100 μM (○). Survival was expressed as percentages of the initial numbers of CFU ml⁻¹, which were approximately 10⁵. Data shown are representative of triplicate experiments.