teratoma. [terâ²ÉtÅâ²mÉ] pl. teratomas, teratomata. a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
The pink-colored film or ring frequently seen on showers, tubs, toilets and pet water bowls is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
E. Coli: a gram negative bacteria and a lactose fermenter, therefore it will produce acid, the indicator neutral red will turn the colony pink. The acid byproducts of lactose fermentation will precipitate the bile salts imparting opacity to the medium.e.