Gram\'s method

[gramz]

Gram's method

[gramz]
noun (sometimes lowercase)
a method of staining and distinguishing bacteria, in which a fixed bacterial smear is stained with crystal violet, treated with Gram's solution, decolorized with alcohol, counterstained with safranine, and washed with water.


Origin:
named after Hans C. J. Gram (1853–1938), Danish bacteriologist
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Gram's method is always a great word to know.
So is quincunx. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
Gram's method
 
n
bacteriol Gram-negative See also Gram-positive a staining technique used to classify bacteria, based on their ability to retain or lose a violet colour, produced by crystal violet and iodine, after treatment with a decolorizing agent
 
[C19: named after Hans Christian Joachim Gram (1853--1938), Danish physician]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

Gram's method (grāmz)
n.
A staining technique used to classify bacteria in which a bacterial specimen is first stained with crystal violet, then treated with an iodine solution, decolorized with alcohol, and counterstained with safranine. Gram-positive bacteria retain the violet stain; gram-negative bacteria do not. Also called Gram's stain.

The American Heritage® Stedman's Medical Dictionary
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