| rad | <radiobiology> A unit of absorbed dose: One rad is 0.01 Joule absorbed per kilogram of any material. (Also defined as 100 ergs per gram and written rad). It is being replaced by the gray (Gy). One rad equals one hundredth of a gray. (16 Dec 1997) |
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| Rad3 ATPase-DNA helicase | <enzyme> Can unwind duplex regions as short as 11 base pairs in a partially duplex circular DNA substrate; on partially duplex linear substrates, the enzyme has a strict 5'--3' polarity with respect to the single strand to which it binds; nicked circular DNA is not utilised; from saccharomyces cerevisiae Registry number: EC 3.6.1.- Synonym: rad3 protein (26 Jun 1999) |
| radar | A system using beamed and reflected radio signals to and from an object in such a way that range, bearing, and other characteristics of the object may be determined. (12 Dec 1998) |
| radarkymography | An obsolete procedure involving the video tracking of heart motion by means of image intensification and closed circuit television during fluoroscopy; enabled cardiac motion to be measured by reproducible linear graphic tracing. (05 Mar 2000) |
| raddle | 1. A long, flexible stick, rod, or branch, which is interwoven with others, between upright posts or stakes, in making a kind of hedge or fence. 2. A hedge or fence made with raddles; called also raddle hedge. 3. An instrument consisting of a woodmen bar, with a row of upright pegs set in it, used by domestic weavers to keep the warp of a proper width, and prevent tangling when it is wound upon the beam of the loom. Origin: Cf. G. Rader, radel, sieve, or perhaps E. Reed. Source: Websters Dictionary (01 Mar 1998) |
| raddock | <zoology> The ruddock. Source: Websters Dictionary (01 Mar 1998) |
| radectomy | Synonym: root amputation. Origin: L. Radix, root, + G. Ektome, excision (05 Mar 2000) |
| Radford | Edward P., Jr., U.S. Physiologist, *1922. See: Radford nomogram. (05 Mar 2000) |
| Radford nomogram | A nomogram used to predict necessary tidal volume for artificial respiration on the basis of respiratory rate, body weight, and sex; correction factors are supplied for activity, fever, altitude, metabolic acidosis, and alterations in dead space. (05 Mar 2000) |
| radi-ate-veined | <botany> Having the principal veins radiating, or diverging, from the apex of the petiole; said of such leaves as those of the grapevine, most maples, and the castor-oil plant. Source: Websters Dictionary (01 Mar 1998) |
| radiability | The property of being radiable. (05 Mar 2000) |
| radiable | Capable of being penetrated or examined by rays, especially by X-rays. (05 Mar 2000) |
| radiad | In a direction toward the radial side. (05 Mar 2000) |
| radial | <botany> Of or pertaining to a radius or ray; consisting of, or like, radii or rays; radiated; as, the radial artery. Radial symmetry. <biology> See Symmetry. Origin: Cf. F. Radial. See Radius. Source: Websters Dictionary (01 Mar 1998) |
| radial acceleration | The centripetal acceleration of a particle or vehicle moving along a curved path at a constant velocity; e.g., turning a curve in an automobile, pulling out of a dive, or performing a loop manoeuvre in an aircraft. In aviation, acceleration varies directly with the square of the air speed and inversely with the radius of the turn (a = V2/r, where V is air speed and r is radius of turn). (05 Mar 2000) |