| manifold | 1. A copy of a writing made by the manifold process. 2. <mechanics> A cylindrical pipe fitting, having a number of lateral outlets, for connecting one pipe with several others. 3. The third stomach of a ruminant animal. Source: Websters Dictionary (01 Mar 1998) |
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| radiography, dual-energy scanned projection | A method of producing a high-quality scan by digitizing and subtracting the images produced by high- and low-energy X-rays. (12 Dec 1998) |
| diagnosis, dual (psychiatry) | The coexistence of a substance abuse disorder with a psychiatric disorder. The diagnostic principle is based on the fact that it has been found often that chemically dependent patients also have psychiatric problems of various degrees of severity. (12 Dec 1998) |
| dual-cure resin | A resin which utilises both light and chemical initiation to activate polymerization. (05 Mar 2000) |
| dual leucine zipper bearing kinase | <enzyme> A serine/threonine kinase but hybrid between microtubule-associated protein kinase kinase kinases and the fibroblast growth factor receptor family; genbank u14636; do not confuse with the neoplasm protein dlk Registry number: EC 2.7.10.- Synonym: dlk kinase (26 Jun 1999) |
| dual personality | A mental disturbance in which a person assumes alternately two different identities without either personality being consciously aware of the other. See: multiple personality. (05 Mar 2000) |
| dual recognition hypothesis | An outmoded hypothesis that is known to be incorrect now that the structure of the T-cell receptor is known. The proposal was that viral (and some chemical) antigens were recognised in association with histocompatibility antigens by separate receptors on the T-cell. The generation of cytotoxic T-cells was by association with Class I MHC antigens, of T helper cells by association with Class II MHC antigens. See: altered self hypothesis. (18 Nov 1997) |
| dual relationships | Relationships in which a health service provider is concurrently participating in two or more role categories with a patient; such dual relationships may be benign (as when both are members of the same social group) or exploitive (a sexual relationship). (05 Mar 2000) |
| abnormal cleavage of cardiac valve | Congenital malformation of a valve leaflet with a defect extending from the free margin. (05 Mar 2000) |
| Amussat's valve | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| anterior cusp of atrioventricular valve | The anterior leaflet or valvule of either the tricuspid or mitral valves. Synonym: cuspis anterior valvae atrioventricularis dextrae/sinistrae. (05 Mar 2000) |
| anterior urethral valve | A crescentic horizontal fold in the proximal spongy urethra. (05 Mar 2000) |
| aortic valve | The heart valve that divides the left ventricle and the aorta. The aortic valve opens during left ventricular contraction and then closes to prohibit the backwash of oxygenated blood from the aorta into the ventricle. The aortic valve has 3 valve cusps. (27 Sep 1997) |
| aortic valve insufficiency | Backflow of blood from the aorta into the left ventricle, owing to imperfect functioning of the aortic semilunar valve. (12 Dec 1998) |
| aortic valve prolapse | The downward displacement of the cuspal material (misalignment of the cusps) below a line joining points of attachment of the aortic valve leaflets. The prolapsed cusp may occlude the ventricular septal defect during ventricular diastole. (12 Dec 1998) |