| 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) |
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| 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) |
| fluorescence plus Giemsa stain | <technique> A stain used to demonstrate sister chromatid exchange; cells are grown in 5-bromodeoxyuridine, followed by chromosome preparation, staining in Hoechst 33258, exposure to light, and staining in Giemsa; chromosomes exhibit a "harlequin" appearance. (05 Mar 2000) |
| fluorescent stain | <technique> A stain or staining procedure using a fluorescent dye or substance that will combine selectively with certain tissue components and that will then fluoresce upon irradiation with ultraviolet or violet-blue light. (05 Mar 2000) |
| Fontana-Masson silver stain | <technique> A stain used to demonstrate melanin and argentaffin granules. Synonym: Fontana-Masson silver stain. (05 Mar 2000) |
| Fontana's stain | <technique> A traditional method for silver-impregnation of treponemes and other spirochetal forms. (05 Mar 2000) |
| Foot's reticulin impregnation stain | <technique> A silver stain in which reticulin stains black and collagen stains golden brown; sections are floated on the surface of solutions to avoid contamination with silver debris. (05 Mar 2000) |
| Laquer's stain | <technique> For alcoholic hyalin, a combination of Altmann's aniline-acid fuchsin stain with a Masson trichrome stain which, on a gray-brown background, stains alcoholic hyalin red, collagen green, and nuclei brown. (05 Mar 2000) |
| Fouchet's stain | <technique> Fouchet's reagent employed to demonstrate bile pigments; paraffin sections are used for conjugated bile pigments, frozen sections for unconjugated ones. (05 Mar 2000) |
| Fraser-Lendrum stain | <technique> For fibrin, a multistaining procedure after Zenker's fixative in which fibrin, keratin, and some cytoplasmic granules appear red, erythrocytes appear orange, and collagen appears green. (05 Mar 2000) |
| lead hydroxide stain | <technique> A stain for electron microscopy; after aldehyde fixation, alkaline lead hydroxide preferentially stains RNA, but after OsO4 fixation, it reacts largely with osmium in tissues to give a general stain; in addition to binding to cytomembranes, it also stains carbohydrates (e.g., glycogen). (05 Mar 2000) |
| Friedlander's stain | <technique> For capsules, an obsolete stain employing gentian violet. (05 Mar 2000) |
| Leishman's stain | <technique> A polychromed eosin-methylene blue stain used in the examination of blood films. (05 Mar 2000) |