Gram-positive en · ADJ
Etymology
From Gram (“a surname”) + positive, after Danish bacteriologist Hans Christian Gram, who invented the Gram staining method.
Meanings
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(not-comparable, of a bacterium) That stains dark blue or violet after Gram staining, due to large quantities of peptidoglycan in the cell wall.
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: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:
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| gram-positive | alternative | lexicographic |