| concentration | 1. Increase in strength by evaporation. 2. <chemistry> The ratio of the mass or volume of a solute to the mass or volume of the solution or solvent. Origin: L. Concentratio (18 Nov 1997) |
|---|---|
| concentration camps | Facilities in which war or political prisoners are confined. (12 Dec 1998) |
| concentration cell | <physiology> An electrochemical cell in which the two compartments contain the same solutions, but at different concentrations. (05 Jan 1998) |
| concentration gradient | <chemistry> A column of liquid in which the density varies continually with position, usually as a consequence of variation of concentration of a solute. Such gradients may be established by progressive mixing of solutions of different density as for example: sucrose gradients) or by centrifuge induced redistribution of solute (as for caesium chloride gradients). Density gradients are widely used for centrifugal and gravity induced separations of cells, organelles and macromolecules. The separations may exploit density differences between particles or primarily differences in size, in which latter case the function of the gradient is chiefly to stabilise the liquid column against mixing. (12 Jan 1998) |
| concentration-effect curve | <pharmacology> This is a graph produced to show the relationship between the exposure concentration of a drug or other foreign chemical and the magnitude of the graded effect that it produces. (05 Jan 1998) |
| concentration-response curve | <pharmacology> This is a graph produced to show the relation between the exposure concentration of a drug (or other chemical) and the degree of response it produces, as measured by the percentage of the exposed population showing a defined, often quantal, effect. (05 Jan 1998) |
| concentric | Having a common centre, such that two or more spheres, circles, or segments of circles are within one another. (05 Mar 2000) |
| concentric fibroma | <tumour> A benign neoplasm, actually a leiomyoma, that occupies the entire circumference of the wall of the uterus. (05 Mar 2000) |
| concentric hypertrophy | Thickening of the walls of the heart or any cavity with apparent diminution of the capacity of the cavity. (05 Mar 2000) |
| concentric lamella | One of the concentric tubular layers of bone surrounding the central canal in an osteon. Synonym: haversian lamella. (05 Mar 2000) |
| concept | 1. An abstract idea or notion. 2. An explanatory variable or principle in a scientific system. Synonym: conception. Origin: L. Conceptum, something understood, pp. Ntr. Of concipio, to receive, apprehend (05 Mar 2000) |
| concept formation | A cognitive process involving the formation of ideas generalised from the knowledge of qualities, aspects, and relations of objects. (12 Dec 1998) |
| concepti | Plural of conceptus. (05 Mar 2000) |
| conception | <biology, gynaecology> The onset of pregnancy, marked by implantation of the blastocyst, the formation of a viable zygote. Origin: L. Conceptio (18 Nov 1997) |
| conceptual | Relating to the formation of ideas, usually higher order abstractions, to mental conceptions. (05 Mar 2000) |