If you inoculate and incubate a pr-glucose and 24 hours later you observe that the medium has turned yellow, and that there is a bubble in the durham tube, you conclude that the bacteria are glucose + and gas +.
If an organism is skillful of fermenting the sugar glucose, then acidic result are seen and the pH indicator turns yellow. Escherichia coli is capable of fermenting glucose as are Proteus mirabilis (far right) and Shigella dysenteriae (far left).Bacteria can utilize a much greater variety of sugars, but given a choice prefer glucose. All bacteria produce gas when they ferment. That is indicated by a color change of a phenol red glucose broth from red to yellow.
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