| DAR | death after resuscitation; diacereine; differential absorption ratio |
|---|---|
| DARP | drug abuse rehabilitation program |
| DART | developmental and reproductive toxicology |
| DARTS | Drug and Alcohol Rehabilitation Testing System |
| DAR | Differential absorption ratio |
|---|---|
| DARC | Duffy Antigen Receptor for Chemokines |
| DARP | Drug Abuse Reporting Program |
| dare | To have adequate or sufficient courage for any purpose; to be bold or venturesome; not to be afraid; to venture. "I dare do all that may become a man; who dares do more is none." (Shak) "Why then did not the ministers use their new law? Bacause they durst not, because they could not." (Macaulay) "Who dared to sully her sweet love with suspicion." (Thackeray) "The tie of party was stronger than the tie of blood, because a partisan was more ready to dare without asking why." (Jowett (Thuyd)) The present tense, I dare, is really an old past tense, so that the third person is he dare, but the form he dares is now often used, and will probably displace the obsolescent he dare, through grammatically as incorrect as he shalls or he cans. "The pore dar plede (the poor man dare plead)." (P. Plowman) "You know one dare not discover you." (Dryden) "The fellow dares nopt deceide me." (Shak) "Here boldly spread thy hands, no venom'd weed Dares blister them, no slimly snail dare creep." (Beau. & Fl) Formerly durst was also used as the present. Sometimes the old form dare is found for durst or dared. Origin: OE. I dar, dear, I dare, imp. Dorste, durste, AS. Ic dear I dare, imp. Dorste. Inf. Durran; akin to OS. Gidar, gidorsta, gidurran, OHG. Tar, torsta, turran, Goth. Gadar, gadaorsta, Gr. Tharsei^n, tharrei^n, to be bold, tharsys bold, Skr. Dhrsh to be bold. To terrify; to daunt. "For I have done those follies, those mad mischiefs, Would dare a woman." (Beau. & Fl) To dare larks, to catch them by producing terror through to use of mirrors, scarlet cloth, a hawk, etc, so that they lie still till a net is thrown over them. <zoology> A small fish; the dace. See: Dace. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| Darier | Jean F., French dermatologist, 1856-1938. See: Darier's disease, Darier's sign. (05 Mar 2000) |
| Darier's disease | A slowly progressive autosomal dominant disorder of keratinization characterised by pinkish-to-tan papules that coalesce to form plaques. These lesions become darker over time and commonly fuse, forming papillomatous and warty malodorous growths. (12 Dec 1998) |
| Darier's sign | <clinical sign> Urtication on stroking of cutaneous lesions of urticaria pigmentosa (mastocytosis). (05 Mar 2000) |
| dark adaptation | The adjustment of the eye occurring under reduced illumination in which the sensitivity to light is greatly increased or the light threshold is greatly reduced. Dark adaptation is slower than light adaptation. During dark adaptation rhodopsin is built up in the retinal rods. (12 Dec 1998) |
| dark cell | Cell's in eccrine sweat glands having many ribosomes and mucoid secretory granules. (05 Mar 2000) |
| dark current | <physiology> Current caused by constant influx of sodium ions into the rod outer segment of retinal photoreceptors and that is blocked by light (leading to hyperpolarization). The plasma membrane sodium channel is controlled through a cascade of amplification reactions initiated by photon capture by rhodopsin in the disc membrane. (18 Nov 1997) |
| dark field illumination | <microscopy> Any method of illumination which illuminates the specimen but does not admit light directly to the objective. It may be by substage (dark field) condensers, by stagespot lighting, by special condensers fitted around special objectives for reflected illumination or by the slit ultramicroscope. (05 Aug 1998) |
| dark field imaging | <microscopy> Using a single diffracted beam to form the image in a transmission electron microscope. This causes all regions of the specimen not of the same crystal structure and orientation as the region which produced the diffracted beam to be represented as very dark in the final image, allowing phase differentiation visually in the transmission electron microscope. (05 Aug 1998) |
| dark field microscopy | <procedure> A system of microscopy in which particles are illuminated at a very low angle from the side so that the background appears dark and the objects are seen by diffracted and reflected patches of light against a dark background. (18 Nov 1997) |
| dark field objective | <microscopy> Certain objectives for high-power, dark fieldwork equipped with iris diaphragms or funnel stops so that their apertures may be reduced to correspond to the dark field con-denser with which they are used. (05 Aug 1998) |
| dark field slides | <microscopy> Owing to the exacting demands of dark field illumination, not only must the microscope slide be especially clean, but also the glass of which the slide is composed must be optically clear under dark field conditions. The glass should not fluoresce. (05 Aug 1998) |
| dark field stop | <microscopy> A central stop for obtaining a dark field effect for low-power objectives. It is customarily used with a high numerical aperture, bright field condenser. (05 Aug 1998) |
| dark reaction | <biochemistry, plant biology> The reactions in photosynthesis that occur after NADPH and ATP production and that take place in the stroma of the chloroplast. By means of the reaction, carbon dioxide is incorporated into carbohydrate. (18 Nov 1997) |
| dark t2 lesion | <radiology> (short T2), acute haemorrhage (deoxyHb), haemosiderin, physiologic iron (basal ganglia, etc.), mucinous lesions (?) most abnormalities have long T1 and T2 (dark/bright). Compare: bright T1 lesion. (07 Mar 2000) |
Synonyms : Adaptation, Dark, Adaptation, Scotopic
Synonyms : Darknesses
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| Darier's disease |
keratosis follicularis: a rare hereditary condition marked by dark crusted patches (sometimes containing pus)
Ãâó: wordnet.princeton.edu/perl/webwn
|
|---|---|
| dark adaptation |
the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours
Ãâó: wordnet.princeton.edu/perl/webwn
|
| dark-field microscope |
ultramicroscope: light microscope that uses scattered light to show particles too small to see with ordinary microscopes
Ãâó: wordnet.princeton.edu/perl/webwn
|
| darkroom |
a room in which photographs are developed
Ãâó: wordnet.princeton.edu/perl/webwn
|
| darwinism |
a theory of organic evolution claiming that new species arise and are perpetuated by natural selection
Ãâó: wordnet.princeton.edu/perl/webwn
|
| DAR | the capital and second largest city of Tanzania |
|---|---|
| DAR | a unit of elastance equal to the reciprocal of a farad |
| DAR | any of a group of Indic languages spoken in Kashmir and eastern Afghanistan and northern Pakistan |
| DAR | a native of ancient Troy |
| DAR | the unsuccessful campaign in World War I (1915) by the English and French to open a passage for aid to Russia |
| DAR | the strait between the Aegean and the Sea of Marmara that separates European from Asian Turkey |
| DAR | the unsuccessful campaign in World War I (1915) by the English and French to open a passage for aid to Russia |
| DAR | a native of ancient Troy |
| DAR | (Greek mythology) founder of Troy |
| DAR | any of a group of Indic languages spoken in Kashmir and eastern Afghanistan and northern Pakistan |
| DAR | any of a group of Indic languages spoken in Kashmir and eastern Afghanistan and northern Pakistan |
| DAR | a challenge to do something dangerous or foolhardy |
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