| unique DNA | <molecular biology> Any nucleotide sequence in DNA that is found only once in a given genome. (09 Oct 1997) |
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| unique identifier reporting | In public health, a system that uses information such as the person's birth date and part of their identification number (in the u.s., the social security number) to create a unique code that is reported instead of a name. It is an alternative to named reporting that provides some of the surveillance benefits of reporting by name, such as the elimination of duplicate reports, while reducing privacy concerns by avoiding use of a person's name. For example, HIV testing in maryland and texas is done with unique identifier reporting. (12 Dec 1998) |
| unique species | <biology> A biotic resource whose presence is unusual and of special interest due to extremities of range, special soil types, or unusual associations with other species. (09 Oct 1997) |
| uniradiated | Having but one ray. Origin: Uni- + radiated. Source: Websters Dictionary (01 Mar 1998) |
| uniramous | <biology> Having but one branch. Origin: Uni- + L. Ramus branch. Source: Websters Dictionary (01 Mar 1998) |
| uniseptate | <botany> Having but one septum, or partition; said of two-celled fruits, such as the silicles of cruciferous plants. Origin: Uni- + septate. Source: Websters Dictionary (01 Mar 1998) |
| unisexual | <biology> Describes an organism that is male or female, i.e., has the reproductive organs of only one sex. (09 Oct 1997) |
| unisilicate | <chemical> A salt of orthosilicic acid, H4SiO4; so called because the ratio of the oxygen atoms united to the basic metals and silicon respectively is 1:1; for example, Mg2SiO4 or 2MgO.SiO2. Origin: Uni- + silicate. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| unit of energy | CGS system: erg, joule, MKS system: newton-meter (joule), FPS system: foot-poundal,gravitational unit: gram-centimeter, gram-meter, kilogram-meter, foot-pound,SI: joule. (05 Mar 2000) |