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Gram-positive
[ gram-poz-i-tiv ]
adjective
- (of bacteria) retaining the violet dye when stained by Gram's method.
Gram-positive
adjective
- designating bacteria that retain the violet stain in Gram's method
gram-positive
- Relating to a group of bacteria that turn a dark-blue color when subjected to a laboratory staining method known as Gram's method. Gram-positive bacteria have relatively thick cell walls and are generally sensitive to the destructive effects of antibiotics or the actions of the body's immune cells. Gram-positive bacteria include beneficial nitrogen-fixing bacteria in soil, as well as the bacteria that cause anthrax, botulism, leprosy, tuberculosis, scarlet fever, and strep throat.
- Compare gram-negative
Word History and Origins
Origin of Gram-positive1
Example Sentences
Gram-positive and gram-negative bacteria differ in the composition of their cell walls.
"We have pretty strong evidence that this new structural class is active against Gram-positive pathogens by selectively dissipating the proton motive force in bacteria," Wong says.
Hiley envisioned them as the “Gram twins,” representing two different types of bacteria: Gram-positive and Gram-negative.
However, this did not happen with exposure to Gram-positive bacteria, which lack lipopolysaccharides in their cell membranes.
L. monocytogenes is a Gram-positive bacterium, which means that it has a single lipid membrane and a thick cell wall.
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