Gram stain

(redirected from Gram staining)
Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.

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 ?
Kappa co-efficient was used to measure the agreement between the two diagnostic tools, Gram staining and culture.
Interestingly, all the CSF samples used in this study did not reveal any aetiology on Gram staining.
Contract notice: Delivery of reagents used in gram staining and hematologic stainings with spray nozzles provide uniform application of dye - along with the lease two devices stain - one device for gram stain, a second device for staining of cytocentrifuge hematology.
It is recommended that a standardized Gram staining interpretative scheme be used in order to improve the reproducibility of this method (9).
Gram staining of sputum and BAL samples is the mainstay of diagnosis for Nocardia where they appear as gram-positive branching filamentous rods.
With delicate hues of purple and pink, a lab technique called gram staining has reliably characterized bacteria for more than a century.
Preliminary testing on positive blood cultures, other than Gram staining, was done by 18 of 58 reporting laboratories (31.
Gram staining revealed wide, short, nonspore-forming, gram-positive rods.
Upon gram staining, 4 isolates were identified as gram positive bacteria, while the 12 isolates shown as gram negative bacteria.
The recent introduction of multi-slide, cuvette-design automated stainers represents a leap forward in delivering random access features for gram staining.
Outside of regular duty hours, BC samples that turned positive for microbial growth were immediately processed for Gram staining and cultivated for later biochemical bacterial identification (confirmation of MALDI-TOF MS results), antibiotic susceptibility testing, and MALDI-TOF MS (Fig.
There is no precise criteria for interpreting the normal or pathogenic, and using conventional polymerase chain method it can only prove the presence of microorganism in the vagina, but not the number of colony forming units, while Gram staining microscopy is simple vaginal flora diagnostic techniques that have established criteria for diagnostic the pathology.