Gram stain


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Related to Gram stain: Gram negative, Gram positive

Gram stain

 (grăm) also Gram's stain (grămz)
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 safranin. Because of differences in cell wall structure, gram-positive bacteria retain the violet stain whereas gram-negative bacteria do not. Also called Gram's method.

[After Hans Christian Joachim Gram (1853-1938), Danish physician.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Gram stain - a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram's solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the gentian violet are Gram-positive and those that do not retain it are Gram-negative
staining - (histology) the use of a dye to color specimens for microscopic study
References in periodicals archive ?
Who'd have thought gram stain lecture material needed an update?
POCARED announces a breakthrough in pre-analytical technologies and systems with its novel Gram stain methodology.
Fourteen patients were already receiving the optimal antimicrobials at the time of the Gram stain and were not included in the time to optimal antibiotic analysis.
Random access processing of gram stain slides provides high-volume laboratories an ideal mix of standardization, labor-efficiency, and throughput.
Gram stain classification is clinically useful as it provides an initial indication of the nature of a patient's infection.
At present, there is no definitive test that can confirm or exclude bacterial meningitis in patients with CSF findings that are consistent with a diagnosis of bacterial meningitis, but in whom the CSF Gram stain and culture results are negative.
Gram stain reagents (crystal violet, Lugol's iodine, ethanol, safranin)
Thus, a total of 601 vaginal smears from the same number of women were included in the study and subjected to Nugent scoring using Gram stain examination.
A negative gram stain from an initial aspirate could have led to the assumption that the symptoms were due to an acute exacerbation of the arthropathy or a frozen shoulder.