| picrocarmine stain | <technique> A red crystalline powder derived from a solution of carmine, ammonia, and picric acid which is evaporated, leaving the powder (soluble in water); it produces excellent staining of keratohyaline granules. (05 Mar 2000) |
|---|---|
| picro-Mallory trichrome stain | <technique> A modification of Mallory's trichrome stain that involves the addition of picric acid. (05 Mar 2000) |
| picronigrosin stain | <technique> A solution of nigrosin in picric acid, used for staining connective tissue. (05 Mar 2000) |
| Weigert-Gram stain | <technique> A stain for bacteria in tissues in which sections are stained in alum-haematoxylin, then in eosin, aniline methyl violet, and Lugol's solution. (05 Mar 2000) |
| Weigert's iron haematoxylin stain | <technique> A nuclear staining solution containing haematoxylin, ferric chloride, and hydrochloric acid; useful in combination with von Gieson's stain, especially for demonstrating connective tissue elements or Entamoeba histolytica in sections. (05 Mar 2000) |
| Weigert's stain | <technique> 1. For actinomyces, a staining method using immersion in a dark red orsellin solution in alcohol, then staining in crystal-violet solution. See: iron haematoxylin. 2. For elastin, a staining solution of fuchsin, resorcin, and ferric chloride; elastic fibres stain blue-black. 3. For fibrin, a staining method using solutions of aniline-crystal violet and iodine-potassium iodide, then decolorizing in aniline oil and xylol; the fibrin is stained dark blue. 4. For myelin, a staining method using ferric chloride and haematoxylin; myelin stains deep blue, degenerated portions a light yellowish colour. 5. For neuroglia, a complicated process in which the final treatment is like that for staining fibrin; neuroglia and nuclei stain blue. 6. For reticulum, a silver impregnation technique in which reticulum appears as black, well-defined fibres without beading and with a relatively clear background. (05 Mar 2000) |
| Mowry's colloidal iron stain | <technique> A stain used for demonstrating acid mucopolysaccharides. (05 Mar 2000) |
| Williams' stain | <technique> A stain for Negri bodies which utilises picric acid, fuchsin, and methylene blue; Negri bodies are magenta, granules and nerve cells blue, and erythrocytes yellowish. (05 Mar 2000) |
| plasma stain | <technique> Plasmatic stainplasmic stain, a stain whose principal affinity is for the cytoplasm of cells. (05 Mar 2000) |
| MSB trichrome stain | <technique> A stain for fibrin using martius yellow, brilliant crystal scarlet 6R, and soluble blue; fibrin is selectively stained red and connective tissue appears blue. (05 Mar 2000) |
| plastic section stain | <technique> For electron microscopy, a stain (e.g., osmic acid, PTA, potassium permanganate) used on thin sections of plastic-embedded tissues, utilizing differential attachment of heavy atoms to various cellular and tissue structures so that electrons will be absorbed and scattered by these structures to produce an image; to achieve differential staining, the stain must penetrate nonwettable plastic embedments, for light microscopy, a stain (e.g., alkaline toluidine blue, silver methenamine) used on plastic-embedded tissues to attain higher resolution and more detail than normally possible; semi-thick (0.5-1.5 um) sections are particularly useful in renal pathology, especially in combination with the phase microscope. (05 Mar 2000) |
| multiple stain | <technique> A mixture of several dyes each having an independent selective action on one or more portions of the tissue. (05 Mar 2000) |
| Wright's stain | <technique> A staining mixture of eosinates of polychromed methylene blue used in staining of blood smears. (05 Mar 2000) |
| contrast stain | <technique> A dye used to colour one portion of a tissue or cell which remained unaffected when the other part was stained by a dye of different colour. Synonym: differential stain. (05 Mar 2000) |
| port-wine stain | <technique> A mark on the skin that resembles port wine (porto) in its rich ruby red colour. Due to an abnormal aggregation of capillaries, a port-wine stain is a type of haemangioma. It occurs on the face as a sign of sturge-weber syndrome. (12 Dec 1998) |