| dyes | Coloured chemical substances that impart more or less permanent colour to other materials. They are used for staining and colouring, as test reagents, and as therapeutic agents in medicine. (12 Dec 1998) |
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| dyewood | Any wood from which colouring matter is extracted for dyeing. Source: Websters Dictionary (01 Mar 1998) |
| Dyggve, Holger | <person> Danish paediatrician, 1913-1984. See: Dyggve-Melchior-Clausen syndrome. (05 Mar 2000) |
| Dyggve-Melchior-Clausen syndrome | <syndrome> An osteochondrodysplasia that clinically resembles Morquio's syndrome, but without excretion of mucopolysaccharides; characterised by mental retardation, short stature, progressive sternal bulging, flattening of vertebral bodies and iliac crests, shortening of metacarpals, and changes in long bones; autosomal recessive inheritance, but there is an X-linked form. Dyskinesia, clearance of mucus is sluggish and bronchiectasis is prevalent and intractable. There is evidence that the defect lies in dynein, a protein in the cilia. The pattern of inheritance is apparently autosomal recessive however multiple versions may exist. (05 Mar 2000) |
| dyke-davidoff-masson syndrome | <radiology> Unilateral skull and sinus hypertrophy, mainly frontal sinus and mastoid air cells, atrophy of ipsilateral cerebral hemisphere (in childhood), cerebral infarction (most often), infection, trauma, congenital hypoplasia (12 Dec 1998) |
| dynactin | <protein> Dynein activator complex that stimulates vesicle transport. Includes dynactin (160 kD) and polypeptides of 62, 50, 45, 37 and 32, the 45 kD (possibly actin RPV) being the most abundant. All the subunits cosediment with antibody to dynactin 160 and the complex behaves as a stable 20S multiprotein assembly. See: centractin. (18 Nov 1997) |
| dynameter | 1. A dynamometer. 2. <optics> An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power. Origin: Gr. Power: cf. F. Dynametre. Cf. Dynamometer. Source: Websters Dictionary (01 Mar 1998) |
| dynamic aorta | Abnormally marked pulsations of aorta. (05 Mar 2000) |
| dynamic compliance of lung | The value obtained when lung compliance is estimated during breathing by dividing the tidal volume by the difference in instantaneous transpulmonary pressures at the ends of the respiratory excursions, when flow in the airway is momentarily zero; this value deviates markedly from static compliance in patients in whom resistances and compliances are not uniform throughout the lung (i.e., uneven time constants). (05 Mar 2000) |
| dynamic computed tomography | Computed tomography with rapid injection of contrast medium, usually with sequential scans at only one or a few levels; used to enhance the vascular compartment. Synonym: dynamic CT. (05 Mar 2000) |
| dynamic CT | Computed tomography with rapid injection of contrast medium, usually with sequential scans at only one or a few levels; used to enhance the vascular compartment. Synonym: dynamic CT. (05 Mar 2000) |
| dynamic demography | A study of the functioning of a community, including statistical records. (05 Mar 2000) |
| dynamic disease | A physical disorder with no known or detectable organic basis to explain the symptoms. See: behaviour disorder, neurosis. Synonym: dynamic disease, functional disease, functional illness. (05 Mar 2000) |
| dynamic equilibrium | Balance A condition in which no further net change is occuring in a system, and free energy is minimimal. (09 Oct 1997) |
| dynamic focusing | <microscopy> An automatic focusing adjustment of the electron beam in high-quality cathode-ray or video image pickup tubes. The beam is made to land with the properly shaped minimum-sized spot regardless of its position in the raster scan (05 Aug 1998) |