Respuesta :
Lactose, sucrose, or both sugars can ferment to produce a significant amount of acid, which causes the butt and slant to turn yellow.
This means that the isolate can ferment lactose, sucrose, or both, as seen by the emergence of yellow color in both slant and butt.
Acidic byproducts produced during glucose fermentation will cause the media's phenol red indicator to turn yellow. The tube will therefore be fully yellow following the first few hours of incubation.
The organism now needs to choose a different food source because all of the available glucose has been consumed. In the image shown, the bacteria Proteus Vulgaris and Salmonella Typhi are both H2S positive. Bacteria that are H2S positive can generate hydrogen sulfide from sources such.
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