| digitalis unit | The activity of 0.1 g of the international standard powdered digitalis. (05 Mar 2000) |
|---|---|
| diphtheria antitoxin unit | The antitoxin activity of 0.0628 mg standard diphtheria antitoxin. (05 Mar 2000) |
| dog unit | The amount of adrenal cortical extract per kilogram of body weight which, given daily, will maintain an adrenalectomised dog in good condition for 7 to 10 days. (05 Mar 2000) |
| insulin unit | The activity contained in 1/22 mg of the international standard of zinc-insulin crystals. (05 Mar 2000) |
| international unit | The amount of a substance, such as a drug, hormone, vitamin, enzyme, etc., that produces a specific effect as defined by an international body and accepted internationally; e.g., for an enzyme it is umole of product formed (or substrate consumed) per minute. Synonym: unit. (05 Mar 2000) |
| ostiomeatal unit | Point where the frontal and maxillary sinuses normally drain into the nasal cavity; obstruction produces inflammation of affected sinus cavities. Synonym: ostiomeatal unit. (05 Mar 2000) |
| Oxford unit | <microbiology> The minimum amount of penicillin which will prevent the growth of Staphylococcus aureus over an area 26 mm in diameter in a standard culture medium; 1 unit equals 0.6 ug of crystalline sodium salt of penicillin. Synonym: Florey unit. (05 Mar 2000) |
| tetanus antitoxin unit | The antitoxin activity of 0.3094 mg of standard tetanus antitoxin. (05 Mar 2000) |
| thiamin hydrochloride unit | The antineuritic activity of 0.003 mg of the standard crystalline vitamin B1 hydrochloride. Synonym: vitamin B1 hydrochloride unit. (05 Mar 2000) |
| electromagnetic unit | The unit in an absolute system (CGS) of unit's utilizing the magnetic effects of current; e.g., abampere, abfarad, abhenry, abohm, abvolt. (05 Mar 2000) |
| Todd unit | The unit in which the results of testing for antistreptolysin O (ASO) are expressed. It denotes the reciprocal of the highest dilution of test serum at which there continues to be neutralization of a standard preparation of the streptococcal enzyme streptolysin O. (05 Mar 2000) |
| electrostatic unit | The unit in an absolute system (CGS) of unit's utilizing static electricity; e.g., statampere, statcoulomb, statfarad, stathenry, statvolt. (05 Mar 2000) |
| toxic unit | A unit formerly synonymous with minimal lethal dose but which, because of the instability of toxins, is now measured in terms of the quantity of standard antitoxin with which the toxin combines. See: L doses, minimal lethal dose. Synonym: toxin unit. (05 Mar 2000) |
| transcription unit | <molecular biology> A region of DNA that is transcribed to produce a single primary RNA transcript, i.e. A newly synthesised RNA molecule that has not been processed. Transcription units can be mapped by kinetic studies of RNA synthesis and in some instances directly visualised by electron microscopy. (17 Mar 1998) |
| equine gonadotropin unit | <veterinary> The specific gonadotropic activity of 0.25 mg of standard preparation of the gonadotropic principle of pregnant mares' serum. (05 Mar 2000) |