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Comparison of growth and pH changes in three urea‐containing growth media, Christensen urea broth (CUB), Stuart's urea broth (SUB), and M9‐based urea medium (M9U). (a) growth of Kebsiella pneumoniae (measured as OD630). (b) change in pH (measured as a color change) caused by K. pneumoniae. (c) change in pH (measured as a color change) caused by purified jack bean urease
