| acetic anhydride | <chemistry> Anhydrides of acetic acid. Used extensively as acetylation, oxidation and dehydrating agents and in the modification of proteins and enzymes. (12 Dec 1998) |
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| acetic phosphoric anhydride | CH3CO-OPO32-;a "high energy" phosphate that acts as an acetate donor in the metabolism of various bacteria. Synonym: acetic phosphoric anhydride. (05 Mar 2000) |
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| acid anhydride hydrolases | <enzyme> A group of enzymes that catalyze the hydrolysis of diphosphate bonds in compounds such as nucleoside di- and tri-phosphates, and sulfonyl-containing anhydrides such as adenylylsulfate. (enzyme nomenclature, 1992). Registry number: EC 3.6 (12 Dec 1998) |
| acidic anhydride | <chemistry> A substance (such as the oxide of a nonmetallic element) that will react with water to form an acid. (09 Oct 1997) |
| anhydride | <chemistry> A compound that becomes an acid in the presence of water or becomes a base when water is removed. (12 Nov 1997) |
| basic anhydride | <chemical> A chemical (usually the oxide of a metal) which forms a base when it is mixed with water. (09 Oct 1997) |
| carbonic anhydride | <biochemistry, physiology> A metabolic byproduct of carbohydrate metabolism. Carbon Dioxide collects in the tissues, is cleared by the blood (via the veins) and removed from the body via the lungs when we exhale air. Abbreviation: CO2 (13 Nov 1997) |
| resorcinol phthalic anhydride | <chemical> Fluorophore commonly used in microscopy. Fluorescein di acetate can be used as a vital stain or can be conjugated to proteins (particularly antibodies) using isothiocyanate. Excitation is at 365nm and the emitted light is green yellow (450-490nm). The emission spectrum is pH sensitive and fluorescein can therefore be used to measure pH in intracellular compartments. (18 Nov 1997) |
| coumaric anhydride | <drug> O hydroxycinnamic acid. Pleasant smelling compound found in many plants and released on wilting (probably a major component of the smell of fresh hay). Has anticoagulant activity by competing with Vitamin K. (18 Nov 1997) |
| silicic anhydride | Fine particulate dust from quartz rock that is known to cause a progressive lung injury over long-term. See: pneumoconiosis. (27 Sep 1997) |
| trimethylglycocoll anhydride | <chemical> A derivative of glycine characterised by high water solubility. Can function as an osmotic agent in plant tissues. See: biogenic amines. (18 Nov 1997) |
| acetic | <chemistry> Of a pertaining to vinegar; producing vinegar; producing vinegar; as, acetic fermentation. Pertaining to, containing, or derived from, acetyl, as acetic ether, acetic acid. The latter is the acid to which the sour taste of vinegar is due. Origin: L. Acetum = vinegar, fr. Acere to be sour. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| acetic aldehyde | <chemical> A colourless, flammable liquid used in the manufacture of acetic acid, perfumes, and flavors. It is also an intermediate in the metabolism of alcohol. It has a general narcotic action and also causes irritation of mucous membranes. Large doses may cause death from respiratory paralysis. Chemical name: Acetaldehyde (12 Dec 1998) |
| acetic amide | <chemistry> A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl. It is used as a solvent and acts as a mild irritant. (25 Jun 1999) |
| acetic fermentation | <biochemistry> A type of fermentation conducted by certain microbes in which organic materials are broken down into acetic acid to generate ATP for energy. (09 Oct 1997) |