| rhachilla | <botany> A branch of inflorescence; the zigzag axis on which the florets are arranged in the spikelets of grasses. Origin: NL, fr. Gr. "rachis the spine. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| rhachiodont | <zoology> Having gular teeth formed by a peculiar modification of the inferior spines of some of the vertebrae, as certain South African snakes (Dasypelits) which swallow birds' eggs and use these gular teeth to crush them. Origin: Gr. "rachis, -ios, the spine +, a tooth. Source: Websters Dictionary (01 Mar 1998) |
| rhachis | Origin: See Rachis Alternative forms: rechis. 1. <anatomy> The spine. 2. <botany> The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern. The principal axis in a raceme, spike, panicle, or corymb. 3. <zoology> The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis. The central cord in the stem of a crinoid. The median part of the radula of a mollusk. A central cord of the ovary of nematodes. Source: Websters Dictionary (01 Mar 1998) |
| rhadinovirus | A genus of the family herpesviridae, subfamily gammaherpesvirinae, infecting new world primates. Herpes virus 2, ateline is the type species. (12 Dec 1998) |
| rhagades | <dermatology> Fissures, cracks or fine linear scars in the skin, especially such lesions around the mouth or other regions subjected to frequent movement. Origin: pl. Of Gr. Rhagas = rent (18 Nov 1997) |
| rhagadiform | Resembling or characterised by rhagades. Origin: G. Rhagas (rhagad-), crack, + L. Forma, shape (05 Mar 2000) |
| rhagamanthus | One of the three judges of the internal regions; figuratively, a strictly just judge. Origin: L, fr. Gr. Source: Websters Dictionary (01 Mar 1998) |
| rhagiocrine cell | Relatively long lived phagocytic cell of mammalian tissues, derived from blood monocyte. Macrophages from different sites have distinctly different properties. Main types are peritoneal and alveolar macrophages, tissue macrophages (histiocytes), Kupffer cells of the liver and osteoclasts. In response to foreign materials may become stimulated or activated. Macrophages play an important role in killing of some bacteria, protozoa and tumour cells, release substances that stimulate other cells of the immune system and are involved in antigen presentation. May further differentiate within chronic inflammatory lesions to epithelioid cells or may fuse to form foreign body giant cells or Langhans giant cells. (18 Nov 1997) |
| rhamnaceous | <botany> Of or pertaining to a natural order of shrubs and trees (Rhamnaceae, or Rhamneae) of which the buckthorn (Rhamnus) is the type. It includes also the new Jersey tea, the supple-jack, and one of the plants called lotus (Zizyphus). Source: Websters Dictionary (01 Mar 1998) |
| rhamnanase | <enzyme> An enzyme borne on the typing phage a7 that specifically cleaves rhamnan and releases oligosaccharides Registry number: EC 3.2.1.- (26 Jun 1999) |
| rhamnogalacturonan | <plant biology> Plant cell wall polysaccharide consisting principally of rhamnose and galacturonic acid. Present as a major part of the pectin of the primary cell wall. Two types known: rhamnogalacturonan I (RG I), the major component, which contains rhamnose, galacturonic acid, arabinose and galactose and rhamnogalacturonan II, (RG II), containing at least four different sugars in addition to galacturonic acid and rhamnose. (18 Nov 1997) |
| rhamnogalacturonan acetylesterase | <enzyme> From aspergillus aculeatus; removes the acetyl esters from rhamnogalacturonan; acts in synergy with rhamnogalacturonases; genbank x89714 Registry number: EC 3.1.1.- Synonym: rgae enzyme (26 Jun 1999) |
| rhamnogalacturonan rhamnohydrolase | <enzyme> Active towards terminal, nonreducing rhamnose alpha-1,4-linked to galacturonic acid Registry number: EC 3.2.1.- Synonym: rg-rhamnohydrolase (26 Jun 1999) |
| rhamnose | <biochemistry> A sugar found in plant glycosides. (18 Nov 1997) |
| rhamnose permease | <chemical> Synonym: rhat gene product, rhat protein, l-rhamnose-h symporter (26 Jun 1999) |