| http://www.w3.org/ns/prov#value | - other metabolic product gas) in the detection region; and optionally (f) correlating a change in the color of the pH (or gas) indicator between the first time and the second time with a presence of microorganisms (e.g., bacteria such as aerobic bacteria producing carbon dioxide or other gas as a metabolite, yeasts, molds) in the sample.
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