Fig. 5.

Acid resistance defect in S. Typhimurium ΔydcI mutant. Isogenic WT and ΔydcI S. Typhimurium strains were tested for resistance to osmotic (2.5 M NaCl), thermal (50°C), and acid (pH 3.5 using citric acid or HCl) stress over a time period of 120 min. The percent survival of the WT and ΔydcI mutant strains under the corresponding stress (compared to before addition of stress) was calculated, and a ratio of the percent survival of the indicated ΔydcI mutant test strain to that of the WT strain is shown. The ΔydcI mutant strain containing pBAD18 or pBAD18+ydcI was grown in the presence of arabinose.