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.
Gram-positive bacteria retain a purple-colored stain, while Gram-negative bacteria appear pinkish or red. Gram-negative bacteria can cause many types of infections and are spread to humans in a variety of ways.xamples of Gram-negative bacteria that have demonstrated drug resistance include. 1  E. coli, which causes the majority of urinary tract infections. 2  Acinetobacter baumanii, which causes disease mainly in healthcare settings. 3  Pseudomonas aeruginosa, which causes bloodstream infections and pneumonia in hospitalized patients. 4  Klebsiella pneumoniae, ....