| isochronia | 1. The state of having the same chronaxie. 2. Agreement, with respect to time, rate, or frequency, between processes. Origin: iso-+ G. Chronos, time (05 Mar 2000) |
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| isochronous | Occurring during the same time. (05 Mar 2000) |
| isochroous | <optics> Having the same colour; connecting parts having the same colour, as lines drawn through certain points in experiments on the chromatic effects of polarized light in crystals. Source: Websters Dictionary (01 Mar 1998) |
| isocitrase | <enzyme> A key enzyme in the glyoxylate cycle. It catalyses the conversion of isocitrate to succinate and glyoxylate. Chemical name: Isocitrate glyoxylate-lyase Registry number: EC 4.1.3.1 (12 Dec 1998) |
| isocitrate | <biochemistry> An intermediate in the tricarboxylic acid cycle (citric acid cycle). (18 Nov 1997) |
| isocitrate dehydrogenase | <enzyme> An enzyme of the oxidoreductase class that catalyses the conversion of isocitrate and NAD+ to yield 2-ketoglutarate, carbon dioxide, and NADH. It occurs in cell mitochondria. The enzyme requires magnesium, mn2+; it is activated by ADP, citrate, and calcium, and inhibited by NADH, NADPH, and ATP. The reaction is the key rate-limiting step of the citric acid (tricarboxylic) cycle. (the NADP+ enzyme is EC 1.1.1.42.) Chemical name: Isocitrate:NAD+ oxidoreductase (decarboxylating) Registry number: EC 1.1.1.41 (12 Dec 1998) |
| isocitrate lyase | <enzyme> A key enzyme in the glyoxylate cycle. It catalyses the conversion of isocitrate to succinate and glyoxylate. Chemical name: Isocitrate glyoxylate-lyase Registry number: EC 4.1.3.1 (12 Dec 1998) |
| isocitric acid | HOOCCH2CH(COOH)CH(OH)COOH;an intermediate in the tricarboxylic acid cycle. (05 Mar 2000) |
| isocitric acid dehydrogenase | <enzyme> An enzyme of the oxidoreductase class that catalyses the conversion of isocitrate and NAD+ to yield 2-ketoglutarate, carbon dioxide, and NADH. It occurs in cell mitochondria. The enzyme requires magnesium, mn2+; it is activated by ADP, citrate, and calcium, and inhibited by NADH, NADPH, and ATP. The reaction is the key rate-limiting step of the citric acid (tricarboxylic) cycle. (the NADP+ enzyme is EC 1.1.1.42.) Chemical name: Isocitrate:NAD+ oxidoreductase (decarboxylating) Registry number: EC 1.1.1.41 (12 Dec 1998) |
| isocitritase | <enzyme> A key enzyme in the glyoxylate cycle. It catalyses the conversion of isocitrate to succinate and glyoxylate. Chemical name: Isocitrate glyoxylate-lyase Registry number: EC 4.1.3.1 (12 Dec 1998) |
| isocline | A line in a geographical region that joins all points at which in a population there is the same average frequency for the various alleles at a genetic locus. See: cline. Origin: iso-+ G. Klino, to slope (05 Mar 2000) |
| isoclinic | <physics> Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip. Isoclinal lines, lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip. Origin: Iso- + Gr. To incline. Source: Websters Dictionary (01 Mar 1998) |
| isoconazole | Antibacterial and antifungal agent related to ketoconazole and oxiconazole. (05 Mar 2000) |
| isocoria | Equality in the size of the two pupils. Origin: iso-+ G. Kore, pupil (05 Mar 2000) |
| isocortex | O. And C. Vogt's term for the larger part of the mammalian cerebral cortex, distinguished from the allocortex by being composed of a larger number of nerve cells arranged in six layers. See: cerebral cortex. Synonym: homotypic cortex, neocortex, neopallium. (05 Mar 2000) |