eosin-methylene blue agar

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e·o·sin-meth·yl·ene blue a·gar

agar composed of peptone, lactose, and sucrose and containing eosin and methylene blue, used to select for and distinguish between lactose-fermenting and nonlactose-fermenting gram-negative bacteria. Echerichia sp. show a characteristic sheen.
Synonym(s): EMB agar

e·o·sin-meth·yl·ene blue a·gar

(ē'ō-sin-meth'i-lēn blū ā'gahr)
Agar composed of peptone, lactose, sucrose, eosin, and methylene blue; inhibits growth of most gram-positive bacteria; used thus to distinguish between lactose-fermenting and non-lactose-fermenting, gram-negative bacteria.