| 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) |
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| 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) |
| Leishman stain | <pathology, procedure> Romanovsky type stain, a mixture of basic and acid dyes used to stain blood smears and that differentially stains various classes of leucocytes. (18 Nov 1997) |
| Lendrum's phloxine-tartrazine stain | <technique> A stain for demonstrating acidophilic inclusion bodies, which appear red on a yellow background; nuclei stain blue, but Negri bodies do not stain. (05 Mar 2000) |
| Lepehne-Pickworth stain | <technique> A staining technique for haemoglobin and other haem-containing substances in cryostat or frozen sections, which utilises the presence of tissue peroxidase to oxidise benzidine to a blue quinhydrone. (05 Mar 2000) |
| Levaditi stain | <technique> A silver nitrate stain for blackening spirochetes in tissue sections. (05 Mar 2000) |
| Lillie's allochrome connective tissue stain | <technique> A procedure using PAS, haematoxylin, picric acid, and methyl blue; used for distinction between basement membrane and reticulin, and for demonstration of arteriosclerotic lesions. (05 Mar 2000) |