Microbiology Lab Excercise 12 - Gram Negative Bacilli

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E. coli - on blood agar - non hemolytic


E. coli - on EMB, showing a metallic green sheen


Proteus - Members of the genus Proteus will swarm at certain intervals and produce a pattern of rings due to their motility. This photograph shows swarming of Proteus mirabilis on DNase agar


E. coli and a non-lactose fermentation - MacConkey agar inoculated with lactose-fermenting Escherichia coli (at left) and non-lactose-fermenting Proteus (at right). Lactose-fermenting bacteria appear bright pink, while non-lactose-fermenting bacteria appear colorless. This demonstrates the differential nature of MAC agar.

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