Gomori methenamine-silver stain

Go·mo·ri meth·en·a·mine-sil·ver stain

(gō-mō'rē),
techniques for argentaffin cells: a method using a methenamine-silver solution in combination with gold chloride, sodium thiosulfate, and safranin O; argentaffin granules appear brown-black against a green background; urates: warm sections are treated directly with a hot methenamine-silver solution to produce a blackening of urates; fungi: see Grocott-Gomori methenamine-silver stain; melanin, which reduces silver nitrate.
Synonym(s): GMS stain
Farlex Partner Medical Dictionary © Farlex 2012

Go·mo·ri meth·en·a·mine-sil·ver stain

(gō-mōr'ē meth-en'ă-mēn sil'vĕr stān)
Techniques for 1) argentaffin cells: a method using a methenamine-silver solution in combination with gold chloride, sodium thiosulfate, and safranin O; argentaffin granules appear brown-black against a green background; 2) urates: warm sections are treated directly with a hot methenamine-silver solution to produce a blackening of urates; 3) fungi:see Grocott-Gomori methenamine-silver stain; 4) melanin, which reduces silver nitrate.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The histochemical stain results for acid-fast bacilli (Ziehl-Neelsen) and fungi (Gomori methenamine-silver stain) were likewise negative.
(4) The organisms are readily apparent with the use of special histochemical stains, such as Gridley fungus stain, periodic acid-Schiff (with or without diastase), and Gomori methenamine-silver stain (Figure 3).
The granules were approximately 200 to 300 [micro] m in diameter They were positively stained with Gram and Gomori methenamine-silver stain, showing rodlike structure with arborizing growth pattern, which was consistent with features of P acnes (Figure 3, B).
Fungal organisms in the surgical specimens can be identified using Gomori methenamine-silver stain, but this does not aid in distinguishing the dematiaceous fungi from Aspergillus or Zygomycetes species.[6] The Fontana-Masson stain can distinguish the pigmented fungi because the organism's pigment is similar to that of melanin.