Active pH homeostasis

Active pH homeostasis depends primarily on the potassium ion and proton circuits. The genetic control of ATR in S. typhimurium consists of two stages, the preacid-shock phase and the postacid-shock phase. The preacid shock is induced at an external pH of pH 5.8, and the postacid shock 

Facultative pathogenic bacteria use many complex systems to enable them to sense and adapt to environmental stresses. These systems then provide signals for the appropriate expression of genes to encode colonization and pathogenicity factors (Merrell and Camilli, 1999). 

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Active pH homeostasis Depends primarily on the potassium ion and the proton circuits. 

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