| Ar | Symbol for argon. (05 Mar 2000) |
|---|---|
| ara | 1. <prefix> Prefix for arabinose or arabinosyl. 2. <ornithology> A name of the great blue and yellow macaw (Ara ararauna), native of South America. 3. <astronomy> The Altar; a southern constellation, south of the tail of the Scorpion. Source: Websters Dictionary (01 Mar 1998) |
| ara operon | <biochemistry, molecular biology> Operons involved in arabinose metabolism, especially. The araBAD operon of E. Coli.Two other ara operons are known in E. Coli. (18 Nov 1997) |
| araari | <ornithology> A South American bird, of the genus Pleroglossius, allied to the toucans. There are several species. Source: Websters Dictionary (01 Mar 1998) |
| arab world | A historical and cultural entity dispersed across a wide geographical area under the administrative, intellectual, social, and cultural domination of the arab empire. The arab world, under the impetus of islam, by the eighth century a.d., extended from arabia in the middle east to all of northern africa, southern spain, sardinia, and sicily. Close contact was maintained with greek and jewish culture. While the principal service of the arabs to medicine was the preservation of greek culture, the arabs themselves were the originators of algebra, chemistry, geology, and many of the refinements of civilization. (12 Dec 1998) |
| arab- | Gum arabic; similar gummy substances. Origin: G. Araps, Arabos, an Arab (05 Mar 2000) |
| araban | <biochemistry> A polysaccharide that yields arabinose on hydrolysis; a constituent of some pectins. (05 Mar 2000) |
| arabesque | A style of ornamentation either painted, inlaid, or carved in low relief. It consists of a pattern in which plants, fruits, foliage, etc, as well as figures of men and animals, real or imaginary, are fantastically interlaced or put together. It was employed in Roman imperial ornamentation, and appeared, without the animal figures, in Moorish and Arabic decorative art. (See Moresque) The arabesques of the Renaissance were founded on Greco-Roman work. Origin: F. Arabesque, fr. It. Arabesco, fr. Arabo Arab. Source: Websters Dictionary (01 Mar 1998) |
| arabia | The great peninsula of southwest asia comprising most of the present countries of the middle east. It has been known since the first millenium b.c. In early times it was divided into arabia petraea, the northwest part, the only part ever conquered, becoming a roman province; arabia deserta, the northern part between syria and mesopotamia; and arabia felix, the main part of the peninsula but by some geographers restricted to modern yemen. (12 Dec 1998) |
| arabic | Relating to or derived from various species of Acacia having a gummy or resinous exudate. (05 Mar 2000) |
| arabic acid | 1. <chemistry> A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance. 2. Mucilage, especially that made of gum arabic. Source: Websters Dictionary (01 Mar 1998) |
| arabidopsis | A genus of flowering plants found in north temperate regions. The species a. Thaliana is used for experiments in classical plant genetics as well as molecular genetic studies in plant physiology, biochemistry, and development. (12 Dec 1998) |
| Arabidopsis thaliana | <botany, molecular biology> The common wall cress. A small plant, adopted as a model system for plant molecular biology, because of its small genome (7x10exp7 bp) and short generation time (5-8 weeks). (18 Nov 1997) |
| arabin | 1. <chemistry> A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance. 2. Mucilage, especially that made of gum arabic. Source: Websters Dictionary (01 Mar 1998) |
| arabinoadenosine | <drug> An antibiotic used to treat viral encephalitis. Its structure is derived from the purine adenosine by replacing the simple sugar ribose with the simple sugar arabinose. (09 Oct 1997) |