| iodotyrosine deiodinase defect | See: familial goiter. (05 Mar 2000) |
|---|---|
| iodous | <chemistry> Pertaining to, or containing, iodine. See -ous (chemical suffix). Iodous acid, a hypothetical acid, analogous to chlorous acid. Source: Websters Dictionary (01 Mar 1998) |
| iodoxamate meglumine | 3,3'-[Ethylenebis(oxyethylene-oxyethylenecar bonylimino)]bis-[2,4,6-triiodobenzoic acid] compound with 1-deoxy-1-(methylamino)-d-glucitol (1:2);the methylglucamine salt of an ionic, water-soluble, dimeric, radiographic contrast medium; formerly used primarily for intravenous cholangiography. (05 Mar 2000) |
| ioduret | <chemistry> A binary compound of iodine, or one which may be regarded as binary; as, potassium iodide. Source: Websters Dictionary (01 Mar 1998) |
| ioduria | Urinary excretion of iodine. (05 Mar 2000) |
| iodyrite | <chemical> Silver iodide, a mineral of a yellowish colour. Origin: From Iodine. Source: Websters Dictionary (01 Mar 1998) |
| ioglycamic acid | <chemical> 3,3'-[oxybis((1-oxo-2,1-ethanediyl)imino)]bis(2,4,6-triiodo-benzoic acid). Radiopaque medium; a mixture of its meglumine and sodium salts is used to visualise the biliary tract. Pharmacological action: contrast media. Chemical name: Benzoic acid, 3,3'-(oxybis((1-oxo-2,1-ethanediyl)imino))bis(2,4,6-triiodo- (12 Dec 1998) |
| iohexol | <chemical> 5-(acetyl(2,3-dihydroxypropyl)amino)-n,n'-bis(2,3- dihydroxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide. An effective non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiographic procedures. Its low systemic toxicity is the combined result of low chemotoxicity and low osmolality. Pharmacological action: contrast media. Chemical name: 1,3-Benzenedicarboxamide, 5-(acetyl(2,3-dihydroxypropyl)amino)-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo- (12 Dec 1998) |
| iolite | <chemical> A silicate of alumina, iron, and magnesia, having a bright blue colour and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite. Origin: Gr. A violet. Source: Websters Dictionary (01 Mar 1998) |
| iometer | An apparatus for measuring ionization. Origin: ion + G. Metron, measure (05 Mar 2000) |
| ion | <chemistry, radiobiology> Atomic particle, atom or chemical radical bearing an electric charge, either negative or positive. (16 Dec 1997) |
| ion channel | <cell biology> A transmembrane pore that presents a hydrophilic channel for ions to cross a lipid bilayer down their electrochemical gradients. Some degree of ion specificity is usually observed and typically a million ions per second may flow. Channels may be permanently open, like the potassium leak channel or they may be voltage gated, like the sodium channel or ligand gated like the acetylcholine receptor. (27 Oct 1998) |
| ion channel gating | The opening and closing of ion channels due to a stimulus. The stimulus can be a change in membrane potential (voltage-gated), drugs or chemical transmitters (ligand-gated), or a mechanical deformation. Gating is thought to involve conformational changes of the ion channel which alters selective permeability. (12 Dec 1998) |
| ion channels | Gated, ion-selective glycoproteins that traverse membranes. The stimulus for channel gating can be a membrane potential, drug, transmitter, cytoplasmic messenger, or a mechanical deformation. Ion channels which are integral parts of ionotropic neurotransmitter receptors are not included. (12 Dec 1998) |
| ion cyclotron emission | <radiobiology> As ions gyrate around in a magnetic field (see also larmor radius or cyclotron radius), they radiate radio-frequency electromagnetic waves. This is known as ion cyclotron emission, and can be measured to help diagnose a plasma. (09 Oct 1997) |