Food Culture Plates - observations made 28/11/06

Culture from Salad, on MacConkey Agar, at 1E-3


Culture from Salad, at 1E-4


Culture from Salad, at 1E-5


Culture from Salad, at 1E-5 - culture surface of agar.


Culture from Salad, at 1E-6. I identified 3 cultures on this plate -

Colony type 1 was circular, raised, papillate, red, with an entire edge, and about 4mm in diameter. Under the microscope, it had strings of gram positive bacilli


Colony type 2 was irregular, flat, matt, pink, with an entire edge, and about 15mm in diameter. Under the microscope, it had individual, gram negative bacilli.

Both of these colonies tested positive for catalase, and negative for oxidase.

Colony type 3 was circular, convex, shiny, red, with an entire edge, and about 2mm in diameter.