| Kinyoun stain | <technique> A method for demonstrating acid-fast microorganisms, using carbol fuchsin, acid alcohol, and methylene blue; acid-fast microorganisms appear red against a blue background. (05 Mar 2000) |
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| 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) |
| 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) |
| Kleihauer's stain | <technique> A combination of aniline blue and Biebrich scarlet red used for detection of foetal cells in the maternal blood. (05 Mar 2000) |
| Klinger-Ludwig acid-thionin stain | <technique> For sex chromatin, a method using a preliminary acid treatment on buccal smears, prior to staining with buffered thionin, to differentiate Barr body. (05 Mar 2000) |
| Kluver-Barrera Luxol fast blue stain | <technique> In combination with cresyl violet, a stain useful for demonstrating myelin and Nissl substance. (05 Mar 2000) |
| uranyl acetate stain | <technique> A stain used in electron microscopy; uranyl acetate binds specifically to nucleic acids but selectively tends to be abolished by osmium fixation; proteins are well stained, but cytomembranes are poorly stained. (05 Mar 2000) |
| urate crystals stain | <technique> A stain using silver methenamine to detect crystals, which polarise light in contrast with calcium crystals; useful in diagnosing gout and kidney infarcts resulting from uric acid build-up. (05 Mar 2000) |
| Kossa stain | <technique> A stain for calcium in mineralised tissue, utilizing a silver nitrate solution followed by sodium thiosulfate; calcified bone but not osteoid is stained brown to black. Synonym: Kossa stain. (05 Mar 2000) |
| Kronecker's stain | <technique> A 5% sodium chloride stain rendered faintly alkaline with sodium carbonate, used in the examination of fresh tissues under the microscope. (05 Mar 2000) |
| Feulgen stain | <technique> A selective cytochemical reaction for DNA in which sections or cells are first hydrolyzed with hydrochloric acid to produce apurinic acid and then are stained with Schiff's reagent to produce magenta-stained nuclei; generally the concentration of DNA in nucleoli and mitochondria is too low to permit detection by this stain See: Kasten's fluorescent Feulgen stain. (05 Mar 2000) |
| Field's rapid stain | <technique> A stain to permit rapid positive diagnosis of malaria in endemic areas by using thick films; it employs methylene blue and azure B in a phosphate buffer, with the preparation counterstained by eosin in a phosphate buffer. (05 Mar 2000) |
| Fink-Heimer stain | <technique> A method used for histologic demonstration of degenerating nerve fibres and terminals of the central nervous system (black on a yellow background). (05 Mar 2000) |
| Flemming's triple stain | <technique> A stain comprised of safranin, methyl violet, and orange G. (05 Mar 2000) |