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.
Bacteria found on toilets consisted mostly of species found in the human gut â this indicates fecal contamination of these surfaces, Fierer said. Floor surfaces contained bacteria commonly found in soils, and surfaces touched by hands, such as faucets and countertops, contained bacteria commonly found on human skin.