| 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) |
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| 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) |
| Kienbock's unit | An obsolete unit of X-ray dosage equivalent to 1/10 the erythema dose. (05 Mar 2000) |
| King-Armstrong unit | The quantity of phosphatase that, acting upon disodium phenylphosphate in excess, at pH 9 for 30 min, liberates 1 mg of phenol. Synonym: King-Armstrong unit. (05 Mar 2000) |
| King unit | The quantity of phosphatase that, acting upon disodium phenylphosphate in excess, at pH 9 for 30 min, liberates 1 mg of phenol. Synonym: King-Armstrong unit. (05 Mar 2000) |
| unit | 1. A single thing or person. 2. <mathematics> The least whole number; one. "Units are the integral parts of any large number." (I. Watts) 3. A gold coin of the reign of James I, of the value of twenty shillings. 4. Any determinate amount or quantity (as of length, time, heat, value) adopted as a standard of measurement for other amounts or quantities of the same kind. 5. <mathematics> A single thing, as a magnitude or number, regarded as an undivided whole. Abstract unit, the unit of numeration; one taken in the abstract; the number represented by 1. The term is used in distinction from concrete, or determinate, unit, that is, a unit in which the kind of thing is expressed; a unit of measure or value; as 1 foot, 1 dollar, 1 pound, and the like. Complex unit, an imaginary number of the form a + b-1, when a^2 + b^2 = 1. Duodecimal unit, a unit in the scale of numbers increasing or decreasing by twelves. Fractional unit, the unit of a fraction; the reciprocal of the denominator; thus, 1/4 is the unit of the fraction 3/4. Integral unit, the unit of integral numbers, or 1. Physical unit, a value or magnitude conventionally adopted as a unit or standard in physical measurements. The various physical units are usually based on given units of length, mass, and time, and on the density or other properties of some substance, for example, water. See Dyne, Erg, Farad, Ohm, Poundal, etc. <biology> Unit deme, stress per unit of area; intensity of stress. It is expressed in ounces, pounds, tons, etc, per square inch, square foot, or square yard, etc, or in atmospheres, or inches of mercury or water, or the like. Origin: Abbrev. From unity. Source: Websters Dictionary (01 Mar 1998) |
| unit character | <genetics> A particular trait or characteristic (usually controlled by a single gene or a set of inseparable genes) that is passed on as a unit in heredity. (09 Oct 1997) |
| unit dose | Occurring in or using a single dose, seen as a standard of measurement. (18 Nov 1997) |
| unit fibrils | The fibril's that comprise a collagen fibre, ranging from 20 to 200 nm and averaging about 100 nm in diameter (substantially larger in tendons), with cross-striations averaging 64 nm. Synonym: collagen fibrils. (05 Mar 2000) |
| unit membrane | <cell biology> The three ply, approximately 7nm wide membrane structure found in all cells, composed of a fluid lipid bilayer with intercalated proteins. The unit membrane theory carries with it the presumption that all biological membranes have basically the same structure. (18 Nov 1997) |
| unit of convergence | See: meter angle. (05 Mar 2000) |