| allosteric enzyme | <biochemistry, chemistry> A regulatory enzyme whose activity is modified by the noncovalent binding of a particular metabolite at a site (the allosteric site) other than the active site. (09 Oct 1997) |
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| allosteric site | A specific site on a multi-subunit enzyme or other protein that is not the substrate binding site, but that when reversibly bound by an effector, induces a conformational change in the protein, altering its catalytic or binding properties. (12 Dec 1998) |
| allosterism | The influencing of an enzyme activity, or the binding of a ligand to a protein, by a change in the conformation of the protein, brought about by the binding of a substrate or other effector at a site (allosteric site) other than the active site of the protein. Compare: cooperativity, hysteresis. (05 Mar 2000) |
| allostery | A phenomenon in which a small ligand binds to a receptor site ona protein, changes the shape of the protein and thus changes the specificityof a second site (either anotherreceptor or an enzyme activesite) on that protein. (09 Oct 1997) |
| allotetraploid | Relating to a hybrid individual or cell with two or more sets of chromosomes derived from two different ancestral species; depending on the number of multiples of haploid sets, alloploid's are referred to as allodiploids, allotriploids, allotetraploids, allopentaploids, allohexaploids, etc. See: heterokaryon. Origin: allo-+ -ploid (05 Mar 2000) |
| allotherm | <biology, zoology> An organism, such as a fish or reptile, that is cold-blooded, i.e., one whose internal body temperature varies with that of the environment. (09 Oct 1997) |
| allothreonines | Two of the four diastereoisomers of threonine, differing from the l-and d-threonines in the configuration of the hydroxyl group in the side chain. (05 Mar 2000) |
| allotope | <immunology> The structural region of an antigen that distinguishes it from another allotype of that antigen. (15 Nov 1997) |
| allotopia | Faulty or abnormal position of a part or organ. Synonym: allotopia, malposition. Origin: dys-+ G. Topos, place (05 Mar 2000) |
| allotransplantation | Transplantation of an allograft. Synonym: homotransplantation. (05 Mar 2000) |
| allotrichia circumscripta | Synonym: woolly-hair nevus. Origin: allo-+ G. Thrix, hair, + L. Circumscriptio, a boundary (05 Mar 2000) |
| allotriodontia | 1. Growth of a tooth in some abnormal location. 2. Transplantation of teeth. Origin: G. Allotrios, foreign, + odous (odont-), tooth (05 Mar 2000) |
| allotriogeustia | Perverted taste for innutritious or unusual substances. Origin: G. Allotrios, foreign, + geusis, taste (05 Mar 2000) |
| allotriophagy | <medicine> A depraved appetite; a desire for improper food. Origin: Gr. Strange + to eat: cf. F. Allotriophagie. Source: Websters Dictionary (01 Mar 1998) |
| allotriosmia | Incorrect recognition of odours. Synonym: heterosmia. Origin: G. Allotrios, foreign, + osme, smell (05 Mar 2000) |