| ribes | <botany> A genus of shrubs including gooseberries and currants of many kinds. Origin: NL.; cf. Dan. Ribs, and Ar. Ribas a plant with an acid juice. Source: Websters Dictionary (01 Mar 1998) |
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| Ribes' ganglion | A small sympathetic ganglion situated on the anterior communicating artery of the brain. (05 Mar 2000) |
| Ribes, Francois | <person> French physician, 1765-1845. See: Ribes' ganglion. (05 Mar 2000) |
| ribibe | 1. A sort of stringed instrument; a rebec. 2. An old woman; in contempt. 3. A bawd; a prostitute. See: Rebec. Source: Websters Dictionary (01 Mar 1998) |
| ribitol | <chemical> A sugar alcohol formed by the reduction of ribose. Chemical name: Ribitol (12 Dec 1998) |
| ribityl | The radical of ribitol; a constituent of riboflavin. (05 Mar 2000) |
| ribo- | 1. Ribose. 2. As an italicised prefix to the systematic name of a monosaccharide, ribo-indicates that the configuration of a set of three consecutive, but not necessarily contiguous, CHOH (or asymmetric) groups is that of ribose; e.g., d-ribose, a trivial name, is d-ribo-pentose in systematic nomenclature. Origin: German Ribose (05 Mar 2000) |
| ribo-2-hexulose | Ribo-2-hexulose;a ketohexose; d-psicose is epimeric with d-fructose. Synonym: pseudofructose, ribo-2-hexulose. (05 Mar 2000) |
| riboflavin | <biochemistry> Ribose attached to a flavin moiety that becomes part of FAD and FMN. (23 Aug 1998) |
| riboflavin 5'-phosphate | <biochemistry> This biomolecule serves as a coenzyme for some enzymes that catalyse oxidation-reduction reactions. (09 Oct 1997) |
| riboflavin deficiency | A dietary deficiency of riboflavin causing a syndrome chiefly marked by cheilitis, angular stomatitis, glossitis associated with a purplish red or magenta-coloured tongue that may show fissures, corneal vascularization, dyssebacia, and anaemia. (12 Dec 1998) |
| riboflavin kinase | A cytosolic enzyme catalyzing the formation of flavin mononucleotide (r. Phosphate) from riboflavin, utilizing ATP as phosphorylating agent. Synonym: flavokinase. (05 Mar 2000) |
| riboflavin permease | <chemical> Chemical name: permease, riboflavin (26 Jun 1999) |
| riboflavin synthase | <enzyme> An enzyme that catalyses the formation of riboflavin from two molecules of 6,7-dimethyl-8-ribityllumazine, utilizing a four-carbon fragment from one molecule which is transferred to the second molecule. Chemical name: 6,7-Dimethyl-8-(1-D-ribityl)lumazine:6,7-dimethyl-8-(1-D-ribityl)lumazine 2,3-butanediyltransferase Registry number: EC 2.5.1.9 (12 Dec 1998) |
| riboflavin unit | Potency usually expressed in terms of weight of pure riboflavin. See: Sherman-Bourquin unit of vitamin B2. Synonym: vitamin B2 unit. (05 Mar 2000) |