| isolytic | Pertaining to, characterised by, or causing isolysis. (05 Mar 2000) |
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| isomaltase | A glucanohydrolase cleaving alpha-1,6 links in isomaltose and dextrins produced from starch and glycogen by alpha-amylase; secreted into the duodenum; a deficiency of this enzyme leads to defects in intestinal digestion of limit dextrins. See: sucrose alpha-d-glucohydrolase. Synonym: isomaltase, limit dextrinase. (05 Mar 2000) |
| isomaltose | <chemical> 6-0-alpha-glucopyranosyl-d-glucose. A disaccharide consisting of two glucose units in an alpha (1-6) glycosidic linkage. Chemical name: D-Glucose, 6-O-alpha-D-glucopyranosyl- (12 Dec 1998) |
| isomaltulose synthase | <enzyme> From erwinia rhapontici; forms isomaltulose and trehalulose from sucrose by intramolecular transglycosylation; formerly EC 5.4.99.10 Registry number: EC 5.4.99.11 (26 Jun 1999) |
| isomastigote | Denoting a protozoan having two or four flagella of equal length at one extremity. Origin: iso-+ G. Mastix, whip (05 Mar 2000) |
| isomer | 1. <chemistry> One of two or more molecules that have the same chemical formula but have a different stereochemical arrangement of their atoms. 2. <radiobiology> Nuclides having the same number of neutrons and protons but capable of existing, for a measurable time, in different quantum states with different energies and radioactive properties. Commonly, the isomer of higher energy decays to one of lower energy by the process of isomeric transition. (13 Nov 1997) |
| isomerase | <enzyme> An enzyme that converts molecules into their positional isomers. (09 Oct 1997) |
| isomerases | <enzyme> A class of enzymes that catalyze geometric or structural changes within a molecule to form a single product. The reactions do not involve a net change in the concentrations of compounds other than the substrate and the product. Registry number: EC 5. (12 Dec 1998) |
| isomeric | <chemistry> Having the same percentage composition; said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif., Polymeric; i. E, having the same elements united in the same proportion by weight, but with different molecular weights; as, acetylene and benzine are isomeric (polymeric) with each other in this sense. See Polymeric. Metameric; i. E, having the same elements united in the same proportions by weight, and with the same molecular weight, but which a different structure or arrangement of the ultimate parts; as, ethyl alcohol and methyl ether are isomeric (metameric) with each other in this sense. See Metameric. Origin: Iso- + Gr. Part: cf. F. Isomerique. Source: Websters Dictionary (01 Mar 1998) |
| isomeric function | The individual function of an isolated segment of the spinal cord. (05 Mar 2000) |
| isomeric transition | The transition of a nuclear isomer to a lower quantum state; e.g., 131mXe → 131Xe + g. (05 Mar 2000) |
| isomeride | <chemistry> An isomer. Source: Websters Dictionary (01 Mar 1998) |
| isomerism | A condition in which several chemical compounds have the same molecular formula (have the same number and type of atoms) but, because those atomsare arranged differently in each, they all have different chemical properties. (09 Oct 1997) |
| isomerization | A process in which one isomer is formed from another, as in the action of isomerases. Enzyme isomerization, reversible changes in enzyme conformation. (05 Mar 2000) |
| isomeromorphism | <chemistry> Isomorphism between substances that are isomeric. Origin: Isomer + Gr. Form + -ism. Source: Websters Dictionary (01 Mar 1998) |
| isokinetic |
British term for isotach.
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| isotope |
Chemical term describing alternative forms of the same element, differing by the number of neutrons in the nucleus. Isotopes of the same element only differ in their masses and usually have very similar chemical properties. Small differences in chemical reaction rates may be associated with the differing masses?the kinetic isotope effect; such effects are usually of the order of 1% or less but can be as large as a factor of 7 for transfer of hydrogen/deuterium.
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| isostere |
A line of equal or constant specific volume. It is equivalent to an isopycnic line.
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| isoprene |
Organic compound, formula C 5 H 8 ; 2
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| isobaric |
Characterized by equal or constant pressure, with respect to either space or time.
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