| At | <abbreviation> The adenine-thymine hydrogen-bonded base pair observed in double-stranded polynucleotides. Symbol for astatine. (05 Mar 2000) |
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| AT content | <molecular biology> The percentage of nitrogenous bases on a DNA molecule which are either adenine or thymine (from a possibility of four different ones, also including cytosine and guanine). See: GC content. (09 Oct 1997) |
| at one | 1. In concord or friendship; in agreement (with each other); as, to be, bring, make, or set, at one, i. E, to be or bring in or to a state of agreement or reconciliation. "If gentil men, or othere of hir contree Were wrothe, she wolde bringen hem atoon." (Chaucer) 2. Of the same opinion; agreed; as, on these points we are at one. 3. Together. "He and Aufidius can no more atone Than violentest contrariety." (Shak) 2. To stand as an equivalent; to make reparation, compensation, or amends, for an offense or a crime. "The murderer fell, and blood atoned for blood." (Pope) "The ministry not atoning for their former conduct by any wise or popular measure." (Junius) Origin: OE. At on, atone, atoon, attone. Source: Websters Dictionary (01 Mar 1998) |
| at wt | <abbreviation> Atomic weight. (05 Mar 2000) |
| AT-I acetyltransferase | <enzyme> An monomorphic isoenzyme of EC 2.3.1.5 from syrian hamsters which catalyses o-acetylation of n-hydroxylamines and n-acetylation of arylamines and hydrazines; amino acid sequence given in first source Registry number: EC 2.3.1.- (26 Jun 1999) |
| AT-II acetyltransferase | <enzyme> A polymorphic isoenzyme of EC 2.3.1.5 from syrian hamsters which catalyses o-acetylation of n-hydroxylamines and n-acetylation of arylamines and hydrazines; amino acid sequence given in first source Registry number: EC 2.3.1.- Synonym: at-b acetyltransferase (26 Jun 1999) |
| at/gc ratio | <molecular biology> The ratio of adenine-thymine base pairs to guanine-cytosine base pairs on a DNA molecule. (09 Oct 1997) |
| ata | <abbreviation> Atmosphere absolute. (05 Mar 2000) |
| atacamite | <chemical> An oxychloride of copper, usually in emerald-green prismatic crystals. Origin: From the desert of Atacama, where found. Source: Websters Dictionary (01 Mar 1998) |
| atactic | <chemistry> This describes a polymer that has no regularly repeated structural units. (09 Oct 1997) |
| atactic abasia | Difficulty in walking due to ataxia of the legs. (05 Mar 2000) |
| atactic agraphia | Agraphia in which not even unconnected letters can be written. Synonym: atactic agraphia, literal agraphia. (05 Mar 2000) |
| atactilia | Loss of the sense of touch. Origin: G. A-priv. + L. Tactilis, relating to touch, fr. Tango, pp. Tactus, to touch (05 Mar 2000) |
| ataractic | 1. Having a calming or tranquillising effect. 2. A tranquilliser. Synonym: ataraxic. Origin: G. Ataraktos, calm (05 Mar 2000) |
| ataraxia | Calmness and peace of mind; tranquility. Origin: G. A-priv. + taraktos, disturbed, + -ia (05 Mar 2000) |