| isopyknic | <physics> Having equal density, as different regions of a medium. A line or surface passing through those points in a medium, at which the density is the same as, an isopycnic line or surface. Origin: Iso- + Gr. Pyknos dense. (08 Mar 2000) |
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| isopyridoxal dehydrogenase | <enzyme> Nad+ dependent; from arthrobacter cr-7 grown on pyridoxine; involved in vitamin b6 degradation Registry number: EC 1.1.1.- (26 Jun 1999) |
| isopyrocalciferol | <biochemistry> A thermal decomposition product of calciferol; a stereoisomer of pyrocalciferol and ergosterol. Chemical name: 9b-Ergosterol. (05 Mar 2000) |
| isoquinoline | A group of compounds with the heterocyclic ring structure of benzo(c)pyridine. The ring structure is characteristic of the group of opium alkaloids such as papaverine. 1. <chemistry> Benzo[c]pyridine; ring structure is characteristic of the group of opium alkaloids represented by papaverine. 2. A class of alkaloids containing the isoquinoline ring structure. (05 Mar 2000) |
| isoquinoline 1-oxidoreductase | <enzyme> A molybdenum-containing hydroxylase from pseudomonas diminuta; catalyses the hydroxylation of isoquinoline to 1-oxo-1,2-dihydroisoquinoline with concomitant reduction of a suitable electron acceptor; mw 95 kD Registry number: EC 1.14.99.- Synonym: isoquinoline 1-hydroxylase (26 Jun 1999) |
| isorcin | <chemistry> A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially. Synonym: cresorcin. Origin: Iso- + orcin. Source: Websters Dictionary (01 Mar 1998) |
| isorhythmic dissociation | <cardiology, physiology> A-V dissociation characterised by equal or closely similar atrial and ventricular rates. (05 Mar 2000) |
| isoriboflavin | <chemical> A riboflavin antimetabolite, differing from riboflavin in that the methyl groups on the isoalloxazine nucleus are in the 6,7 positions rather than the 7,8. Chemical name: 8-Demethyl-6-methylriboflavin. (05 Mar 2000) |
| isorrhoea | Equality of intake and output of water; maintenance of water equilibrium. Origin: iso-+ G. Rhoia, a flow (05 Mar 2000) |
| isorropic | Of equal value. <geometry> Isorropic line (in a diagram), the locus of all the points for which a specified function has a constant value. Origin: Gr. 'isorropos in equipoise; 'isos equal + "roph downward inclination or momentum. Source: Websters Dictionary (01 Mar 1998) |
| isosbestic | <chemistry> Wavelength at which the absorption coefficients of equimolar solutions of two different substances are identical. (18 Nov 1997) |
| isosbestic point | <physics> In applied spectroscopy, a wavelength at which absorbance of two substances, one of which can be converted into the other, is the same. (05 Mar 2000) |
| isosceles | <geometry> Having two legs or sides that are equal; said of a triangle. Origin: L, fr. Gr.; 'isos equal + leg. Source: Websters Dictionary (01 Mar 1998) |
| isoschisomer | <molecular biology> One of several restriction endonucleases which are isolated from different sources but which break a DNA molecule at the same recognition site. (09 Oct 1997) |
| isoschizomer | <molecular biology> A pair of restriction enzymes specific for the same recognition sequence. (14 Nov 1997) |