| ND | Doctor of Naturopathy; nasal deformity; natural death; Naval Dispensary; neonatal death; neoplastic ... |
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| NK | Commission on [Anatomical] Nomenclature [Ger. Nomenklatur Kommission]; natural killer [cell]; neurok... |
| NKCA | natural killer cell activity |
| NKCF | natural killer cytotoxic factor |
| NKSF | natural killer cell stimulatory factor |
| iron-55 | An iron isotope; a positron emitter with a half-life of 2.73 years; used (less often than 59Fe) as a tracer in study of iron metabolism and in blood perfusion studies. (05 Mar 2000) |
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| iron-59 | An iron isotope; a gamma and beta emitter with a half-life of 44.51 days; used as tracer in study of iron metabolism, determination of blood volume, and in blood transfusion studies. (05 Mar 2000) |
| iron alum | An astringent and styptic. Synonym: ammonium ferric sulfate, ferric alum, iron alum. (05 Mar 2000) |
| iron-binding capacity | The capacity of iron-binding protein in serum (transferrin) to bind serum iron. (05 Mar 2000) |
| iron chelating agents | Organic chemicals that form two or more coordination links with an iron ion. Once coordination has occurred, the complex formed is called a chelate. The iron-binding porphyrin group of haemoglobin is an example of a metal chelate found in biological systems. (12 Dec 1998) |
| iron compounds | Inorganic compounds that contain iron as an integral part of the molecule. (12 Dec 1998) |
| iron deficiency | Deficiency of iron results in anaemia because iron is necessary to make haemoglobin, the key molecule in red blood cells responsible for the transport of oxygen. In iron deficiency anaemia, the red cells are unusally small (microcytic) and pale (hypochromic). Characteristic features of iron deficiency anaemia in children include failure to thrive (grow) and increased infections. The treatment of iron deficiency anaemia , whether it be in children or adults, is with iron and iron-containing foods. Food sources of iron include meat, poultry, eggs, vegetables and cereals (especially those fortified with iron). According to the National Academy of Sciences, the recommended dietary allowances of iron are 15 milligrams per day for women and 10 milligrams per day for men. (12 Dec 1998) |
| iron deficiency anaemia | Hypochromic microcytic anaemia characterised by low serum iron, increased serum iron-binding capacity, decreased serum ferritin, and decreased marrow iron stores. Synonym: hypoferric anaemia. (05 Mar 2000) |
| iron-dextran complex | <chemical> Iron dextran. A complex of ferric oxyhydroxide with dextrans of 5000 to 7000 daltons in a viscous solution containing 50 mg/ml of iron. It is supplied as a parenteral preparation and is used as a haematinic. (goodman and gilman's the pharmacological basis of therapeutics, 8th ed, p1292) Pharmacological action: haematinics. Chemical name: Iron dextran (12 Dec 1998) |
| iron dextrin | A complex of dextrin with ferric hydroxide; used intravenously in the treatment of iron deficiency. (05 Mar 2000) |
| iron, dietary | Iron or iron compounds used in foods or as food. Dietary iron is important in oxygen transport and the synthesis of the iron-porphyrin proteins haemoglobin, myoglobin, cytochromes, and cytochrome oxidase. Insufficient amounts of dietary iron can lead to iron-deficiency anaemia. (12 Dec 1998) |
| iron excess | Iron overload can damage the heart, liver, gonads and other organs. Iron overload is a particular risk in people who may have certain genetic conditions (haemochromatosis) sometimes without knowing it and also in people receiving recurrent blood transfusions. According to the national academy of sciences, the recommended dietary allowances of iron are 15 milligrams per day for women and 10 milligrams per day for men. (12 Dec 1998) |
| iron haematoxylin | Unique ferric lakes of haematein that produce deep blue-black stains; useful for studies of cytologic detail, such as chromosomes, spindle fibres, Golgi apparatus, myofibrils, and mitochrondria; also useful to demonstrate Entamoeba histolytica. See: Heidenhain's iron haematoxylin stain, Weigert's iron haematoxylin stain. (05 Mar 2000) |
| iron-hearted | Hard-hearted; unfeeling; cruel; as, an iron-hearted master. Source: Websters Dictionary (01 Mar 1998) |
| iron index | An obsolete index of iron obtained by dividing the figure for the average content of iron in normal blood (42.74 mg) by the red cell count in millions; it normally varies between 8 and 9; in pernicious anaemia, the index is usually greater than 10, but it tends to be normal in chronic secondary anaemia. (05 Mar 2000) |