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.
Although gram positive, acid-fast bacteria do. not take the crystal violet into the wall well, appearing very light purple rather than the deep. purple of normal gram positive bacteria (th e waxy lipid in the acid-fast wall repels the. aqueous crystal violet stain). As in the spore stain, steam is used as a gimmick to get the carbol fuschin primary dye to go. into the wall.