Thus organisms capable of lactose fermentation such as Escherichia coli, form bright pinky-red colonies (plate pictured on the left here). MacConkey agar is commonly used to differentiate between the ...
The confirmed test involves taking a sample from a positive lactose broth tube and streaking it onto Eosin Methylene Blue (EMB) agar. The appearance of dark ... a green metallic sheen (typical for ...
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