| rhodophane | <physiology> The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane. Origin: Gr. "rodon the rose + to show. Source: Websters Dictionary (01 Mar 1998) |
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| rhodophylactic | Relating to rhodophylaxis. (05 Mar 2000) |
| rhodophylaxis | The action of the pigment cells of the choroid in preserving or facilitating the reproduction of rhodopsin. Origin: rhodopsin + G. Phylaxis, a guarding (05 Mar 2000) |
| Rhodophyta | <botany> Division of algae, many of which have branching filamentous forms and red colouration. The latter is due to the presence of phycoerythrin. The food reserve is floridean (starch), found outside the plastid. The walls contain sulphated galactans such as carrageenan and agar. (23 Aug 1998) |
| rhodopseudomonas | A genus of gram-negative, rod-shaped, phototrophic bacteria found in aquatic environments. Internal photosynthetic membranes are present as lamellae underlying the cytoplasmic membrane. (12 Dec 1998) |
| rhodopsin | <protein> Light sensitive pigment formed from retinal linked through a Schiff's base to opsin: rhodopsin is an integral membrane protein found in the discs of retinal rods and cones, comprising some 40% of the membrane. Vertebrate opsins are proteins of 38 kD. See: bacteriorhodopsin. (18 Nov 1997) |
| rhodopsin kinase | <enzyme> Resembles retinal s-antigen in capacity to induce uveitis in experimental animals; isolated from rod photoreceptors; human enzyme 92% identical to bovine enzyme Registry number: EC 2.7.1.125 Synonym: opsin kinase (26 Jun 1999) |
| rhodoquinone oxidoreductase | <enzyme> Couples rotenone-sensitive NADH oxidation with etf and the subsequent reduction of 2-methyl branched-chain enoyl-coas Registry number: EC 1.- Synonym: electron-transfer flavoprotein-rhodoquinone oxidoreductase, etf-ro (26 Jun 1999) |
| rhodosperm | <botany> Any seaweed with red spores. As the name of a subclass, Rhodosperms, or Rhodospermeae, is synonymous with Florideae (which see) Origin: Gr. "rodon the rose + sperma a seed. Source: Websters Dictionary (01 Mar 1998) |
| rhodospirillaceae | Phototrophic bacteria isolated from stagnant water and mud. (12 Dec 1998) |
| rhodospirillales | An order of photosynthetic bacteria representing a physiological community of predominantly aquatic bacteria. (12 Dec 1998) |
| Rhodospirillium rubrum | <bacteria> A purple nonsulphur bacterium with a spiral shape, contains the pigment bacteriochlorophyll and under anaerobic conditions photosynthesises using organic compounds as electron donors for the reduction of carbon dioxide. The purple colour results from the presence of carotenoids, though the bacteria are often more red or brown. (23 Aug 1998) |
| rhodospirillum | A genus of gram-negative, spiral bacteria that possesses internal photosynthetic membranes. Its organisms divide by binary fission, are motile by means of polar flagella, and are found in aquatic environments. (12 Dec 1998) |
| rhodospirillum rubrum | Vibrio- to spiral-shaped phototrophic bacteria found in stagnant water and mud exposed to light. (12 Dec 1998) |
| rhodotorula | Red yeast-like deuteromycetous fungal genus generally regarded as nonpathogenic, cultured from numerous sources in human patients. (12 Dec 1998) |