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A change in pH is sufficient to reproduce the effects of CO2 on H. pylori transformation efficiency. (A) The transformation efficiency of H. pylori SS1 was increased both by a decrease in CO2 (2.9%) and by an increase in pH under buffered conditions (7.6% CO2). (B) Increased transformation efficiency was accompanied by small decreases in CFU. **, P < 0.01; ***, P < 0.001; n.s. = not significant.
