| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
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| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |
| RPA | radial photon apsorptiometry; replication protein A; resultant physiologic acceleration; reverse pas... |
| RP-HPLC | reverse phase-high performance liquid chromatography |
| RPIPP | reverse phase ion-pair partition |
| specific action | The action of a drug or a method of treatment which has a direct and especially curative effect upon a disease, e.g., the action of vitamin B12 in pernicious anaemia. (05 Mar 2000) |
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| specific dynamic action | The increase of heat production caused by the ingestion of food, especially of protein. (05 Mar 2000) |
| delayed-action preparations | Dosage forms of a drug that act over a period of time. (12 Dec 1998) |
| thermogenic action | Increase of heat production of the body, as by the thyroid hormone. Synonym: thermogenic action. (05 Mar 2000) |
| law of mass action | <chemistry> This law states that the rate of a given chemical reaction is proportional to concentration of the reactants. (09 Oct 1997) |
| reverse | 1. To turn back; to cause to face in a contrary direction; to cause to depart. "And that old dame said many an idle verse, Out of her daughter's heart fond fancies to reverse." (Spenser) 2. To cause to return; to recall. "And to his fresh remembrance did reverse The ugly view of his deformed crimes." (Spenser) 3. To change totally; to alter to the opposite. "Reverse the doom of death." (Shak) "She reversed the conduct of the celebrated vicar of Bray." (Sir W. Scott) 4. To turn upside down; to invert. "A pyramid reversed may stand upon his point if balanced by admirable skill." (Sir W. Temple) 5. Hence, to overthrow; to subvert. "These can divide, and these reverse, the state." (Pope) "Custom . . . Reverses even the distinctions of good and evil." (Rogers) 6. To overthrow by a contrary decision; to make void; to under or annual for error; as, to reverse a judgment, sentence, or decree. Reverse arms, a position of a soldier in which the piece passes between the right elbow and the body at an angle of 45 deg, and is held as in the illustration. To reverse an engine or a machine, to cause it to perform its revolutions or action in the opposite direction. Synonym: To overturn, overset, invert, overthrow, subvert, repeal, annul, revoke, undo. Origin: See Reverse, and cf. Revert. 1. Turned backward; having a contrary or opposite direction; hence; opposite or contrary in kind; as, the reverse order or method. "A vice reverse unto this." 2. Turned upside down; greatly disturbed. "He found the sea diverse With many a windy storm reverse." (Gower) 3. <botany> Reversed; as, a reverse shell. <medicine> Reverse bearing, a fire in the rear. <mathematics> Reverse operation, an operation the steps of which are taken in a contrary order to that in which the same or similar steps are taken in another operation considered as direct; an operation in which that is sought which in another operation is given, and that given which in the other is sought; as, finding the length of a pendulum from its time of vibration is the reverse operation to finding the time of vibration from the length. Origin: OE. Revers, OF. Revers, L. Reversus, p. P. Of revertere. See Revert. 1. That which appears or is presented when anything, as a lance, a line, a course of conduct, etc, is reverted or turned contrary to its natural direction. "He did so with the reverse of the lance." (Sir W. Scott) 2. That which is directly opposite or contrary to something else; a contrary; an opposite. "And then mistook reverse of wrong for right." (Pope) "To make everything the reverse of what they have seen, is quite as easy as to destroy." (Burke) 3. The act of reversing; complete change; reversal; hence, total change in circumstances or character; especially, a change from better to worse; misfortune; a check or defeat; as, the enemy met with a reverse. "The strange reverse of fate you see; I pitied you, now you may pity me." (Dryden) "By a reverse of fortune, Stephen becomes rich." (Lamb) 4. The back side; as, the reverse of a drum or trench; the reverse of a medal or coin, that is, the side opposite to the obverse. See Obverse. 5. A thrust in fencing made with a backward turn of the hand; a backhanded stroke. 6. <surgery> A turn or fold made in bandaging, by which the direction of the bandage is changed. Origin: Cf. F. Revers. See Reverse. Source: Websters Dictionary (01 Mar 1998) |
| reverse banding | <technique> A reverse Giemsa chromosome banding method that produces bands complementary to G-bands; induced by treatment with high temperature, low pH, or acridine orange staining; often used together with G-banding on human karyotype to determine whether there are deletions. (05 Mar 2000) |
| reverse bevel | The sloping edge of a cutting instrument. (05 Mar 2000) |
| reverse curve | In dentistry, a curve of occlusion which is convex upward. Synonym: anti-Monson curve. (05 Mar 2000) |
| reverse Eck fistula | Side-to-side anastomosis of the portal vein with the inferior vena cava and ligation of the latter above the anastomosis but below the hepatic veins; the blood from the lower part of the body is thus directed through the hepatic circulation. (05 Mar 2000) |
| reverse electron transport | <chemistry> The energy-dependent movement of electrons against the thermodynamic gradient to form a strong reductant from a weaker electron donor. (11 Jan 1998) |
| reverse genetics | The technique of determining a gene's function by first sequencing it, then mutating it and then trying to identify the nature of the change in the phenotype. (18 Nov 1997) |
| reverse Kingsley splint | A winged maxillary splint used to apply traction to reduce maxillary fractures as well as immobilise them by having the wings attached to a head appliance by elastics. Synonym: reverse Kingsley splint. (05 Mar 2000) |
| reverse mutation | <molecular biology> A mutation that causes a mutant gene to revert to its original wild-type base sequence. Compare: forward mutation. (09 Oct 1997) |
| reverse passive haemagglutination | If antibodies are bonded to the surface of red blood cells haemagglutination will occur if the appropriate bi or multivalent antigen is added in soluble or microparticulate form. Used as a test for for example Hepatitis B virus in the serum. (18 Nov 1997) |