| Unna-Pappenheim stain | <technique> A contrast stain consisting of a methyl green-pyronin solution; originally used for gonococci, but later used to detect RNA and DNA in tissue sections; RNA is stained red and DNA appears green; used to demonstrate plasma cells during chronic inflammation. See: methyl green-pyronin stain. (05 Mar 2000) |
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| Unna's stain | <technique> An alkaline methylene blue stain for plasma cells, a polychrome methylene blue stain with which mast cells are stained red (metachromatic). (05 Mar 2000) |
| Unna-Taenzer stain | <technique> An orcein solution used for staining elastic tissue. Synonym: Unna-Taenzer stain. (05 Mar 2000) |
| Unna, Paul | <person> German dermatologist and staining expert, 1850-1929. See: Unna's disease, Unna's mark, Unna's stain, Unna-Pappenheim stain, Unna-Taenzer stain. (05 Mar 2000) |
| Unna's disease | <dermatology> A form of inflammatory skin rash that results from an over activity of the sebaceous glands in the skin. Treatment often includes a mild hydrocortisone-containing cream. (27 Sep 1997) |
| Unna's mark | A pale vascular birthmark found on the nape of the neck in 25 to 50% of normal persons. Synonym: Unna's mark. (05 Mar 2000) |
| Abbott's stain | <technique> Spores are stained blue with alkaline methylene blue; bodies of the bacilli become pink with eosin counterstain. (05 Mar 2000) |
| aceto-orcein stain | <technique> A stain used for chromosomes in air-dried or squashed cytologic material. (05 Mar 2000) |
| acid-fast stain | <technique> A staining technique used to determine the cell wall property of a microorganism. After stained with dye such as hot carbolfuschin, an acid-fast organism, (for example Mycobacterium species) will retain the colour in its cell wall after being washed with acid-alcohol. (13 Nov 1997) |
| acid stain | <technique> A dye in which the anion is the coloured component of the dye molecule, e.g., sodium eosinate (eosin). (05 Mar 2000) |
| Ag-AS stain | <technique> A stain for the acid protein component of nucleolar regions which are active or which were transcriptionally active in the preceding interphase; uses silver nitrate, ammoniacal silver, and formalin. Synonym: Ag-AS stain. (05 Mar 2000) |
| Albert's stain | <technique> A stain for diphtheria bacilli and their metachromatic granules; contains toluidine blue, methyl green, glacial acetic acid, alcohol, and distilled water. (05 Mar 2000) |
| Altmann's anilin-acid fuchsin stain | <technique> A mixture of picric acid, anilin, and acid fuchsin which stains mitochondria crimson against a yellow background. (05 Mar 2000) |
| auramine O fluorescent stain | <technique> A rapid and accurate technique for Mycobacterium tuberculosis, using auramine O-phenol and a methylene blue counterstain. (05 Mar 2000) |
| basic fuchsin-methylene blue stain | <technique> A stain for intact epoxy sections; semi-thick sections of plastic-embedded tissues have nuclei stained purple; collagen, elastic lamina, and connective tissue are stained blue; mitochondria, myelin, and lipid droplets are stained red; cytoplasm, smooth muscle cells, axoplasm, and chrondroblasts are stained pink. (05 Mar 2000) |