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I recently completed colony morphology on the E.colispecimen.

The results displayed small colonies that were circular in shape, a diameter of approximately 0.5mm, the elevation of the colonies was seen to be slightly raised with the surface incredibly smooth.

The colonies were also seen to have a pink colour pigmentation in Mac conkey agar due to its lactose fermenter after growth.

The gram stain for these bacteria should be negative rod shaped.

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14y ago
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14y ago

Colonial morphology" This gram negative rod is a common contaminant of vegetable matter which forms shiny colonies with entire margins and convex elevation.


Gram stain: negative
Cell shape: bacillus
Arrangement: single
Oxygen requirements: facultative anaerobes

Habitat: intestinal tracts of humans and animals; water; sewage; soil

Pathogenicity: Commonly called "enterics", they can cause urinary tract infections and nocosomial infections. Their presence is not indicative of fecal contamination, so we run a test called the IMViC test to distinguish

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9y ago

Escherichia coli is shaped like a rod; bacteria with this shape are called bacilli. Salmonella is another example of bacilli.

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11y ago

NLF clony on Mac/SSA and Red colony on XLD

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9y ago

The colony morphology of E. coli on nutrient agar looks lactose negative, cellobiose negative, and sucrose negative. In some colonies, a metallic green color is given off by the specimen.

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12y ago

yellow pin point colony

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13y ago

punctiform!

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Q: What is the colony morphology of E. coli on nutrient agar?
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