Figure 3From: Arginine deiminase pathway is far more important than urease for acid resistance and intracellular survival in Laribacter hongkongensis: a possible result of arc gene cassette duplication Survival of wild type L. hongkongensis HLHK9 and derivative mutants under acidic conditions. Survivors were enumerated by plating serial dilutions on BHA plates. Error bars represent means ± SEM of three independent experiments. An asterisk indicates a significant difference (*, p < 0.05; **, p < 0.01; ***, p < 0.001). A, Survival of HLHK9 and HLHK9∆ureA in the presence of 50 mM urea. B, Survival of HLHK9, HLHK9∆arcA1, HLHK9∆arcA2 and HLHK9∆arcA1/arcA2 in the presence of 50 mM arginine. C, Survival of HLHK9, HLHK9∆ureA, HLHK9∆arcA1/arcA2 and HLHK9∆ureA/arcA1/arcA2 in the presence of 50 mM each of urea and arginine. D, Survival of HLHK9, HLHK9∆ureA, HLHK9∆arcA1/arcA2 and HLHK9∆ureA/arcA1/arcA2 at pH 4, and at the indicated time points, in the presence of 50 mM each of urea and arginine.Back to article page