| PFU | plaque-forming unit; pock-forming unit |
|---|---|
| PICU | pediatric intensive care unit; pulmonary intensive care unit |
| PSU | photosynthetic unit; primary sampling unit |
| PU | palindromic unit; passed urine; pepsin unit; peptic ulcer; pregnancy urine; 6-propyluracil; prostati... |
| RTU | real-time ultrasonography; relative time unit; renal transplantation unit |
| 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) |
| estradiol benzoate unit | The oestrogenic activity of 0.1 ug of a standard preparation of estradiol benzoate. (05 Mar 2000) |
| estrone unit | The oestrogenic activity of 0.1 ug (0.0001 mg) of a standard preparation of crystalline estrone. (05 Mar 2000) |
| Jenner-Kay unit | That amount of phosphatase that liberates 1 mg of phosphorus; approximately 2 Bodansky unit's or 1 King unit. (05 Mar 2000) |
| Karmen unit | A formerly used enzyme unit for aminotransferase activity; a change of 0.001 in the absorbance of NADH/min. (05 Mar 2000) |