| iso- | 1. <prefix> A prefix that means equal or like. 2. <chemistry> A prefix indicating isomer of (isomerism); e.g., isocyanate vs. cyanate. 3. <immunology> A prefix designating sameness with respect to species; in recent years, the meaning has shifted to sameness with respect to genetic constitution of individuals. Origin: G. Isos, equal (20 Jun 2000) |
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| iso-osmotic | <physiology> Having the same total osmotic pressure or osmolality as another fluid (ordinarily intracellular fluid); such a fluid is not isosmotic if it includes solutes that freely permeate cell membranes. Synonym: iso-osmotic. (05 Mar 2000) |
| isoacceptor tRNA | <molecular biology> Different tRNA species that bind to alternate codons for the same amino acid residue; can be one tRNA that recognises the various codons that signify those for the particular amino acid residue. (05 Mar 2000) |
| isoagglutination | <immunology> Agglutination of red blood cells as a result of the reaction between an isoagglutinin and specific antigen in or on the cells. Synonym: isohemagglutination. Origin: iso-+ L. Ad, to, + gluten, glue (05 Mar 2000) |
| isoagglutinin | <immunology> An isoantibody that causes agglutination of cells of genetically different members of the same species. Synonym: isohemagglutinin. (05 Mar 2000) |
| isoagglutinogen | <immunology> An isoantigen that induces agglutination of the cells to which it is attached upon exposure to its specific isoantibody. (05 Mar 2000) |
| isoallele | <genetics> One of a number of alleles that can be distinguished only by special molecular analyses. (05 Mar 2000) |
| isoallotypic determinant | <genetics> Genetic determinant's that are both isotypic and allotypic in that they appear in all members of at least one subclass of immunoglobulin but only in some members of another subclass of the same species. (05 Mar 2000) |
| isoalloxazine | <biochemistry> The heterocyclic compound of riboflavin and other flavins. (05 Mar 2000) |
| isoaminile | <chemical> An antitussive agent. Chemical name: 4-(Dimethylamino)-2-isopropyl-2-phenylvaleronitrile (05 Mar 2000) |
| isoamyl | <chemistry> A hydrocarbon radical, C5H11, of the paraffine series found in amyl alcohol or fusel oil, etc. Origin: L. Amylum starch + -yl. Cf. Amidin. Source: Websters Dictionary (01 Mar 1998) |
| isoamylase | <enzyme> An enzyme that hydrolyzes 1,6-alpha-glucosidic branch linkages in glycogen, amylopectin, and their beta-limit dextrins. It is distinguished from pullulanase (ec 3.2.1.41) by its inability to attack pullulan and by the feeble action of alpha-limit dextrins. It is distinguished from amylopectin 6-glucanohydrolase (ec 3.2.1.69) by its action on glycogen. With EC 3.2.1.69, it produces the activity called debranching enzyme. Chemical name: Glycogen 6-glucanohydrolase Registry number: EC 3.2.1.68 (12 Dec 1998) |
| isoandrosterone | 3b-hydroxy-5a-androstan-17-one;inactive isomer (3b instead of 3a) of androsterone; found in urine and in testicular and ovarian tissue. Synonym: isoandrosterone. (05 Mar 2000) |
| isoantibody | <immunology> Antibody produced by one individual in response to antigen from another individual of the same species. The antibody reacts with antigens (isoantigens) of another individual of the same species. (20 Jun 2000) |
| isoantigen | <immunology> An antigen which can cause an immune response in genetically distinct individuals from the same species. They exist in alternative (allelic) forms in a species, and thus induce an immune response when one form is transferred (for example by blood transfusion or tissue graft) to members of the same species who lack the antigen. Typical isoantigens are the blood group antigens. See: isoantibody. (20 Jun 2000) |