Growth rates and end-point yields of <i>H. pylori</i> grown in EMF12 medium with various purine sources.

aDoubling times were calculated using at least five data points taken during exponential growth. Values are the mean ± SD of three or more independent experiments. Doubling times in guanine, xanthine and guanosine were significantly longer than for hypoxanthine, inosine, or adenosine (student's t-test, P<0.05). Final OD600 values were not significantly different from one another. bNG = No growth observed after 36 hours.