Gram-positive
adjEtymology From Gram (“a surname”) + positive, after Danish bacteriologist Hans Christian Gram, who invented the Gram staining method.
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Bacteriology, Biology, Microbiology, Natural sciences Of a bacterium That stains dark blue or violet after Gram staining, due to large quantities of peptidoglycan in the cell wall.
- Generally, ionophore antibiotics are highly effective against Gram-positive bacteria but exhibit little or no activity against Gram-negative bacteria (Chen and Wolin, 1979; Watanabe et al., 1981).1997, T. G. Nagaraja, C. J. Newbold, C. J. Van Nevel, D. I. Demeyer, “13: Manipulation of ruminal fermentation”, in P. N. Hobson, C. S. Stewart, editors, The Rumen Microbial Ecosystem, 2nd edition, page 545:
- Note that L.^([Listeria]) monocytogenes is one of the few Gram-positive bacteria against which vancomycin is not effective — hence the need for ampicillin.2007, Alan R. Hauser, Antibiotic Basics for Clinicians: Choosing the Right Antibacterial Agent, page 201:
1 more example
- The majority of Gram-positive (82%) and Gram-negative (64%) genera carry either ribosomal protection genes alone or in combination with efflux/enzymatic genes as illustrated in Table 7.2.2011, Patricia L. Keen, Mark H. M. M. Montforts, Antimicrobial Resistance in the Environment, page 108:
- Related terms
- Gram staining, Gram's method
- Coordinate terms
- Gram-negative