| Alu | 1. Type II restriction endonuclease, isolated from Arthrobacter luteus. The recognition sequence is 5' AG/CT 3'. 2. Alu sequences are highly repetitive sequences found in large numbers 100-500,000) in the human genome and that are cleaved more than once within each sequence by the Alu endonuclease. The Alu sequences look like DNA copies of mRNA because they have a 3' poly A tail and flanking repeats. (18 Nov 1997) |
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| alu elements | <molecular biology> A set of closely related genetic sequences, each about 300 base pairs long, in the human genome. There are 500,000 to 600,000 copies widely dispersed among all 46 chromosomes: They act as markers for human DNA sequences, although their function in the genome is unknown. The DNA fragments containing the Alu elements are formed by digesting genomic DNA with the restriction endonuclease Alu I. (14 Nov 1997) |
| alu family | A set of dispersed sequences in the human genome having Alu cleavage sites at each end. (05 Mar 2000) |
| alu sequence | Any of a family of short (300 basepairs long) repeated sequences that occur throughout the human genome. (09 Oct 1997) |
| Alu sequences | In the human genome a repeated, relatively conserved sequence of about 300 bp that often contains a cleavage site for the restriction enzyme AluI near the centre; about 1 million copies in the human genome. (05 Mar 2000) |
| alu-equivalent family | A set of sequences in a mammalian genome that is related to the human Alu family. (05 Mar 2000) |
| aludel | <chemistry> One of the pear-shaped pots open at both ends, and so formed as to be fitted together, the neck of one into the bottom of another in succession; used in the process of sublimation. Origin: F. & Sp. Aludel, fr. Ar. Aluthal. Source: Websters Dictionary (01 Mar 1998) |
| alula | <zoology> A false or bastard wing. See Bastard. Origin: NL, dim. Of L. Ala a wing. Source: Websters Dictionary (01 Mar 1998) |
| alular | <zoology> Pertaining to the alula. Source: Websters Dictionary (01 Mar 1998) |
| alum | <chemistry> A double sulphate formed of aluminium and some other element (especially. An alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization. Common alum is the double sulphate of aluminium and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended so as to include other double sulphates similar to alum in formula. Origin: OE. Alum, alom, OF. Alum, F. Alun, fr. L. Alumen alum. Source: Websters Dictionary (01 Mar 1998) |
| alum compounds | Aluminum metal sulfate compounds used medically as astringents and for many industrial purposes. They are used in veterinary medicine for the treatment of ulcerative stomatitis, leukorrhoea, conjunctivitis, pharyngitis, metritis, and minor wounds. (12 Dec 1998) |
| alum root | <botany> A North American herb (Heuchera Americana) of the Saxifrage family, whose root has astringent properties. Source: Websters Dictionary (01 Mar 1998) |
| alum shale | <chemical> A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock. Source: Websters Dictionary (01 Mar 1998) |
| alum stone | <chemical> A subsulphate of alumina and potash; alunite. Source: Websters Dictionary (01 Mar 1998) |
| alum-haematoxylin | A purple nuclear stain used in histology; a mixture of an aqueous solution of ammonium alum and an alcoholic solution of haematoxylin which is ripened or oxidised to haematein. (05 Mar 2000) |