| KF, K-F | Kayser-Fleischer [rings] |
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| Liesegang rings | Coloured ring's of precipitated silver chromate formed when a drop of concentrated silver nitrate is added to the surface of a gel (such as gelatin, agar, or silica gel) containing potassium dichromate. (05 Mar 2000) |
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| Liesegang, Ralph | <person> German chemist, 1869-1947. See: Liesegang rings. (05 Mar 2000) |
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| heterocyclic compounds with 4 or more rings | A class of organic compounds containing four or more ring structures, one of which is made up of more than one kind of atom, usually carbon plus another atom. The heterocycle may be either aromatic or nonaromatic. (12 Dec 1998) |
| Donders' rings | An obsolete term for the iridescent ring's or haloes observed by a cloudy cornea due to acute glaucoma. (05 Mar 2000) |
| oesophageal webs and rings | <radiology> Congenital web, web secondary to bullous disease, cervical web, Plummer-Vinson (Patterson-Kelly) syndrome, mucosal (Schatzki) ring (12 Dec 1998) |
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