Definition of Gram-positive

1. Adjective. (of bacteria) being or relating to a bacterium that retains the violet stain used in Gram's method.

Category relationships: Bacteria, Bacterium
Similar to: Confirming, Positive

Definition of Gram-positive

1. Adjective. (bacteriology) stained dark blue or violet by Gram staining due to large quantities of peptidoglycan in the cell wall ¹

2. Adjective. (context: medicine of a bacterium) that is stained violet by Gram's method ¹

¹ Source:

Medical Definition of Gram-positive

1. Bacteria that retain the stain or that are resistant to decolourisation by alcohol during Gram's method of staining. This is a primary characteristic of bacteria whose cell wall is composed of a thick layer of peptidologlycan containing teichoic and lipoteichoic acid complexed to the peptidoglycan. See: gram-negative (06 Oct 1997)

Gram-positive Pictures

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Lexicographical Neighbors of Gram-positive

gram-molecular weight
gram-negative aerobic bacteria
gram-negative aerobic rods and cocci
gram-negative anaerobic bacteria
gram-negative anaerobic cocci
gram-negative bacteria
gram-negative bacterial infections
gram-negative chemolithotrophic bacteria
gram-negative facultatively anaerobic rods
gram-negative oxygenic photosynthetic bacteria
gram-positive (current term)
gram-positive asporogenous rods
gram-positive bacteria
gram-positive bacterial infections
gram-positive cocci
gram-positive endospore-forming bacteria
gram-positive endospore-forming rods
gram-positive rods
gram atom
gram calorie
gram calories
gram equivalent
gram molecule

Literary usage of Gram-positive

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Journal of Infectious Diseases by Infectious Diseases Society of America, John Rockefeller McCormick Memorial Fund, John McCormick Institute for Infectious Diseases (1915)
"There are also gram-positive, long, thick rods which belong in the ... Certain gram-positive bacilli of the length of the first type of the bacillus ..."

2. Bacteriology and Mycology of Foods by Fred Wilbur Tanner (1919)
"Gram positive bacteria forms a compound between the protoplasm of the cell and the dye which is insoluble in alcohol. In the Gram negative bacteria this ..."

3. Pathogenic microorganisms by William Hallock Park (1920)
"A Gram-stained smear may show all Gram-negative or all Gram- positive microbes or a mixture of the two, or it may show a number only partially stained ..."

4. The Journal of Experimental Medicine by Rockefeller University, Rockefeller Institute, Rockefeller Institute for Medical Research (1916)
"Yeast, Staphylococcus albus, small Gram- positive bacillus. ... 1 tube was sterile, 1 contained a short gram-positive bacillus, and 4, including the tube ..."

5. A Textbook of bacteriology: A Practical Treatise for Students and by Hans Zinsser, Frederick Fuller Russell (1922)
"The former are often spoken of as the gram-positive, the latter as Gram-negative bacteria. The reasons for the differential value of Gram's method are not ..."

6. Bacteriology, General, Pathological and Intestinal by Arthur Isaac Kendall (1921)
"The essential character of the gram-positive cell membrane is that it does not ... The capacity for retaining the compound dye in gram-positive cells is ..."

7. International Medical and Surgical Surveyby American Institute of Medicine by American Institute of Medicine (1922)
"Satisfactory differentiation between Gram positive and Gram negative organisms can be obtained with any of the domestic gentian violets, methyl violet and ..."

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