| Lillie's azure-eosin stain | <technique> A stain in which an azure eosinate solution is used to stain bacteria and rickettsiae in tissues. (05 Mar 2000) |
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| Lillie's ferrous iron stain | <technique> A method using potassium ferrocyanide in acetic acid which demonstrates melanins as a deep green colour; lipofuscins and haem pigments are unreactive. (05 Mar 2000) |
| Lison-Dunn stain | <technique> A technique using leuco patent blue V and hydrogen peroxidase to demonstrate haemoglobin peroxidase on time sections and smears. (05 Mar 2000) |
| Loeffler's caustic stain | <technique> A stain for flagella, utilizing an aqueous solution of tannin and ferrous sulfate with the addition of an alcoholic fuchsin stain. (05 Mar 2000) |
| Loeffler's stain | <technique> A stain for flagella; the specimen is treated with a mixture of ferrous sulfate, tannic acid, and alcoholic fuchsin, then stained with aniline-water fuchsin or gentian violet made alkaline with sodium hydroxide solution. (05 Mar 2000) |
| Luna-Ishak stain | <technique> A staining method using celestine blue and acid fuchsin in which bile canaliculi stain pink to red. (05 Mar 2000) |
| a1-acid glycoprotein | <biology> Plasma protein of mammals and birds, 38% carbohydrate. In humans a single chain glycoprotein of 39 kD. Increased levels are associated with inflammation, pregnancy and various diseases. (18 Nov 1997) |
| abscisic acid | <biochemistry> A lipid hormone that inhibits cell growth in plants, it is associated with fruit drop, leaf death and seed dormancy. It is synthesised in the plastids from carotenoids. This hormone helps plants deal with water loss, and its effects can be reversed with gibberellins. (06 May 1997) |
| abscisic acid 8'-hydroxylase | <enzyme> Catalyses conversion of abscisic acid to 8'-hydroxyabscisic acid, which rearranges to phaseic acid Registry number: EC 1.14.99.- Synonym: aba 8'-hydroxylase (26 Jun 1999) |
| acetic acid | <chemical> The acid most commonly associated with vinegar, it is the most commercially important organic acid and is used to manufacture a wide range of chemical products, such as plastics and Acetobacter but, except for making vinegar, is usually made through synthetic processes. Derivatives of acetic acid which may be formed by substitution reactions. Mono- and di-substituted, as well as, halogenated compounds have been synthesised. Experimentally, alpha- and n2- substituted acetic acids have been examined for their anti-inflammatory activity and effect on the central nervous system respectively. Additionally, limited exposure data has been collected on dibromo and dichloroacetic acids to determine whether they pose health effects. Synonym: ethanoic acid. (26 Jun 1999) |
| acetoacetic acid | CH3COCH2COOH;one of the ketone bodies, formed in excess and appearing in the urine in starvation or diabetes. Synonym: diacetic acid. (05 Mar 2000) |
| acetohydroxamic acid | C2H5NO2; N-Hydroxyacetamide;an inhibitor of urease, used as adjunctive therapy in chronic urea-splitting urinary infections. (05 Mar 2000) |
| acetrizoic acid | <chemical> A water-soluble, iodinated radiographic contrast medium, used as sodium acetrizoate in hysterosalpingography. Pharmacological action: contrast media. Chemical name: Benzoic acid, 3-(acetylamino)-2,4,6-triiodo- (12 Dec 1998) |
| acetylsalicylic acid | <drug> An odourless, white, slightly bitter drug used to reduce pain, fever, inflammation and sometimes to prevent blood clotting. Also called aspirin. Some people cannot tolerate it because it can cause stomach bleeding, however. It is soluble in both water and alcoholand melts at 132 to 136 degrees C. (06 May 1997) |
| acetyltannic acid | An astringent used for treatment of diarrhoea. Synonym: diacetyltannic acid, tannylacetate. (05 Mar 2000) |