| diel | Term frequently used synonymously with diurnal or circadian. Origin: irreg., fr. L. Dies, day (05 Mar 2000) |
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| dieldrin | <biochemistry> A toxic chlorinated organic compound that is used as an insecticide. It causes cancer and is restricted to non-agricultural applications. (09 Oct 1997) |
| dielectric | <physics> Any substance or medium that transmits the electric force by a process different from conduction, as in the phenomena of induction; a nonconductor. Separating a body electrified by induction, from the electrifying body. Origin: Pref. Dia- + electric. Source: Websters Dictionary (01 Mar 1998) |
| dielectrography | impedance plethysmography |
| dielectrolysis | <technique> Separation of ionic molecules, (principally proteins) by the differential migration through a gel according to the size and ionic charge of the molecules in an electrical field. High resolution techniques normally use a gel support for the fluid phase. Examples of gels used are starch, acrylamide, agarose or mixtures of acrylamide and agarose. Frictional resistance produced by the support causes size, rather than charge alone, to become the major determinant of separation. Smaller molecules with a more negative charge will travel faster and further through the gel toward the anode of an electrophoretic cell when high voltage is applied. Similar molecules will group on the gel. They may be visualised by staining and quantitated, in relative terms, using densitometers which continuously monitor the photometric density of the resulting stain. The electrolyte may be continuous (a single buffer) or discontinuous, where a sample is stacked by means of a buffer discontinuity, before it enters the running gel/ running buffer. The gel may be a single concentration or gradient in which pore size decreases with migration distance. In SDS gel electrophoresis of proteins or electrophoresis of polynucleotides, mobility depends primarily on size and is used to determined molecular weight. In pulse field electrophoresis, two fields are applied alternately at right angles to each other to minimise diffusion mediated spread of large linear polymers. See: electrofocussing, pulse field electrophoresis (01 Dec 1998) |
| Diels hydrocarbon | <biochemistry> A phenanthrene derivative obtained by the dehydrogenation of various steroids. (05 Mar 2000) |
| Diels, Otto | <person> German chemist and Nobel laureate, 1876-1954. See: Diels hydrocarbon. (05 Mar 2000) |
| dielytra | <botany> A genus of herbaceous plants, with racemes of two-spurred or heart-shaped flowers, including the Dutchman's breeches, and the more showy Bleeding heart (D. Spectabilis). [Corruptly written dielytra. Origin: NL, fr. Gr. = twice + spur. Source: Websters Dictionary (01 Mar 1998) |