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. 2011 Sep 22;11:207. doi: 10.1186/1471-2180-11-207

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Copyright ©2011 Hwang et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effect of the rpoN mutation on acid stress resistance. (A) Growth of the rpoN mutant under different pH conditions was examined by dotting 10 μl of serially-diluted bacterial cultures. The results are representative of three independent experiments with similar results. (B) Viable cell counts on MH agar with different pH after 24 hr incubation. The % viability is expressed as mean ± standard deviation of three independent experiments. ***: P < 0.001; the significance of results was statistically analyzed by one-way ANOVA using Prism software (version 5.01; GraphPad Software Inc.).