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What (who) is Gram stain - definition
Gram stain
![µm]] in diameter.](https://commons.wikimedia.org/wiki/Special:FilePath/Candida Gram stain.jpg?width=200 "µm]] in diameter.")
![Gram-stain of [[gram-positive]] [[streptococci]] surrounded by pus cells](https://commons.wikimedia.org/wiki/Special:FilePath/Gram-positive bacteria and pus cells.jpg?width=200 "Gram-stain of [[gram-positive]] [[streptococci]] surrounded by pus cells")
![Purple-stained [[gram-positive]] (left) and pink-stained [[gram-negative]] (right)](https://commons.wikimedia.org/wiki/Special:FilePath/Gram Staining Bacteria.jpg?width=200 "Purple-stained [[gram-positive]] (left) and pink-stained [[gram-negative]] (right)")
MICROBIOLOGICAL METHOD FOR IDENTIFICATION; METHOD OF STAINING USED TO DIFFERENTIATE BACTERIAL SPECIES INTO TWO LARGE GROUPS (GRAM-POSITIVE AND GRAM-NEGATIVE)
Gram staining; Gram's stain; Gram-variable; Gram status; Gram's method; Gram Stain; Gram-stain; Gram-staining; Gram-categorization; Gram-indeterminate; Gram indeterminate; Gram Staining; Gram indeterminant; Gram variable
In microbiology and bacteriology, Gram stain or Gram staining, also called Gram's method, is a method of staining used to classify bacterial species into two large groups: gram-positive bacteria and gram-negative bacteria. The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique in 1884.
Gram stain
MICROBIOLOGICAL METHOD FOR IDENTIFICATION; METHOD OF STAINING USED TO DIFFERENTIATE BACTERIAL SPECIES INTO TWO LARGE GROUPS (GRAM-POSITIVE AND GRAM-NEGATIVE)
Gram staining; Gram's stain; Gram-variable; Gram status; Gram's method; Gram Stain; Gram-stain; Gram-staining; Gram-categorization; Gram-indeterminate; Gram indeterminate; Gram Staining; Gram indeterminant; Gram variable
¦ noun Medicine a staining technique for the preliminary distinction of bacteria between two categories (Gram-positive and Gram-negative).
Origin
C19: named after the Danish physician Hans C. J. Gram.
May–Grünwald stain
![May Grünwald–Giemsa staining of bone marrow cells taken from a patient with [[hereditary folate malabsorption]], from a case report by Yukari Sakurai et al., 2022<ref name="Sakurai2022">Sakurai, Y., Toriumi, N., Sarashina, T. et al. An infantile case of hereditary folate malabsorption with sudden development of pulmonary hemorrhage: a case report. J Med Case Reports 16, 268 (2022). https://doi.org/10.1186/s13256-022-03448-x</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Bone marrow smear with May Grünwald–Giemsa staining.png?width=200 "May Grünwald–Giemsa staining of bone marrow cells taken from a patient with [[hereditary folate malabsorption]], from a case report by Yukari Sakurai et al., 2022<ref name=\"Sakurai2022\">Sakurai, Y., Toriumi, N., Sarashina, T. et al. An infantile case of hereditary folate malabsorption with sudden development of pulmonary hemorrhage: a case report. J Med Case Reports 16, 268 (2022). https://doi.org/10.1186/s13256-022-03448-x</ref>")
May–Grünwald stain or May–Grünwald–Giemsa stain is used for the staining of slides obtained by fine-needle aspiration in a histopathology lab for the diagnosis of tumorous cells.
