| radioautography | <technique> A specimen containing radioactive atoms is overlaid with a photographic emulsion (X-ray film), which is subsequently developed, revealing the localisation of radioactivity as a pattern of silver grains. Resolution is determined by the path length of the radiation and so the low energy beta emitting isotope, tritium, is usually used. The technique can be used to visualise radioactively labelled molecules or fragments of molecules, used in analyzing length and number of DNA fragments after they are separated by gel electrophoresis. (12 Mar 1998) |
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| parallel track | <pharmacology> A system for distributing certain experimental drugs to people who are unable to participate in ongoing clinical trials. (09 Oct 1997) |
| double track sign | In paediatric radiology, a less common sign of congenital pyloric stenosis, when barium is caught between mucosal folds in the hypertrophied pylorus. (05 Mar 2000) |
| track | To follow the tracks or traces of; to pursue by following the marks of the feet; to trace; to trail; as, to track a deer in the snow. "It was often found impossible to track the robbers to their retreats among the hills and morasses." (Macaulay) 2. To draw along continuously, as a vessel, by a line, men or animals on shore being the motive power; to tow. Origin: tracked; tracking. 1. A mark left by something that has passed along; as, the track, or wake, of a ship; the track of a meteor; the track of a sled or a wheel. "The bright track of his fiery car." (Shak) 2. A mark or impression left by the foot, either of man or beast; trace; vestige; footprint. "Far from track of men." (Milton) 3. <zoology> The entire lower surface of the foot;-said of birds, ect. 4. A road; a beaten path. "Behold Torquatus the same track pursue." (Dryden) 5. Course; way; as, the track of a comet. 6. A path or course laid out for a race, for exercise, ect. 7. The permanent way; the rails. 8. [Perhaps a mistake for tract] A tract or area, as of land. "Small tracks of ground." Track scale, a railway scale. See Railway. Origin: OF.trac track of horses, mules, trace of animals; of Teutonic origin; cf.D.trek a drawing, trekken to draw, travel, march, MHG. Trechen, pret. Trach. Cf. Trick. Source: Websters Dictionary (01 Mar 1998) |
| track and field | Sports performed on a track, field, or arena and including running events and other competitions, such as the pole vault, shot put, etc. (12 Dec 1998) |
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