What are the colonial features of staphylococus aureus in nutrient agar?

Answer 1

* Colonies are circular, 2-3 nm in diameter with a smooth shiny surface when grown on nutrient agar,milk agar or blood agar for 24 h at 37 degrees * Colonies are often pigmented,though a few strains are unpigmented Got the answers from here http://www.geocities.com/SouthBeach/Port/3008/staphyl.html

Answer 2

E. coli colonial features are a white shiny color with a darker center, it will have a round appearance and a smooth surface. When E.coli grows on agar it seems to grow in rings and can be observed under the microscope.

Answer 3

Staphylococcus aureus is grown on Mannitol salt agar and produces yellow colonies with yellow zones. This agar is a rapid and selective media for pathogenic Staphylococcus. If grown on nutrient agar, the colonies look like any other colony. They are like "bumps" with the color of the agar which is very light tan.