"Gram-positive." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/Gram-positive>.
Gram-positive. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/Gram-positive
From Gram (“a surname") + positive, after Danish bacteriologist Hans Christian Gram, who invented the Gram staining method.
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