| dengue haemorrhagic fever | <microbiology> A tropical disease caused by dengue virus (Arbovirus), that is transmitted by the bite of an infected mosquito of the genus Aedes). Four severity grades of the illness are seen: grade I (fever and constitutional symptoms), grade II (grade I plus spontaneous bleeding of skin, gums or gastrointestinal tract), grade III (grade II plus agitation and circulatory failure) and grade IV (profound shock). Grade I infection is seen most frequently in world travelers, where it is usually self-limited and rarely fatal. The other grades are referred to as dengue haemorrhagic fever and are often fatal. Dengue haemorrhagic fever appears to be an infection by one of the other dengue viruses. Prior immunity to a different dengue virus type appears to be important in the development of the more serious haemorrhagic form. Vaccines are available. Protection from mosquitoes is an important preventive measure. (27 Sep 1997) |
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| dengue shock syndrome | <syndrome> Dengue fever of grade III or IV severity. (05 Mar 2000) |
| dengue virus | A species of the genus flavivirus which causes an acute febrile and sometimes haemorrhagic disease in man. Dengue is mosquito-borne and four serotypes are known. (12 Dec 1998) |
| Denhardt's solution | A solution commonly used during probe hybridisations that involve filters (such as Southern, Northern, or Western blots). The solution contains ficoll, bovine serum albumin, polyvinylpyrrolidone, and a high concentration of non-specific DNA so the probe will not hybridise non-specifically. (12 Jan 1998) |
| denial | <psychology> Refusal to admit the truth or reality of a situation or experience. (12 Dec 1998) |
| denidation | Exfoliation of the superficial portion of the mucous membrane of the uterus; stripping off of the menstrual decidua. Origin: L. De, from, + nidus, nest (05 Mar 2000) |
| denier | A small copper coin of insignificant value. "My dukedom to a beggarly denier." (Shak) Origin: F. Denier, fr. L. Denarius a Roman silver coin orig. Equiv. To ten asses, later, a copper, fr. Deni ten by ten, fr. The root of decem ten; akin to E. Ten. See Ten, and cf. Denary, Dinar. Source: Websters Dictionary (01 Mar 1998) |
| Denil fishway | <marine biology> Fishway that dissipates the water's energy so fish can swim over low barriers without undue stress. A Denil fishway has lateral baffles projecting at an angle from each side of a straight chute and a clear passage up the middle. (12 Jan 1998) |
| Denis Browne splint | A light aluminum splint applied to the lateral aspect of the leg and foot; used for clubfoot. (05 Mar 2000) |
| Denis Browne's pouch | A pocket formed between Scarpa's and external oblique fascia adjacent to external inguinal ring; a common lodging site for undescended testes (as in cryptorchism). Synonym: superficial inguinal pouch. (05 Mar 2000) |
| denitration | A disengaging, or removal, of nitric acid. Origin: Pref. De- + nitrate. Source: Websters Dictionary (01 Mar 1998) |
| denitrification | 1. <biochemistry> The removal of an oxygen atom from a nitrogen compound (like NO3 to NO2, NO2 to NO, or NO to N2). This is something soil bacteria do successively until they release nitrogen gas. Conversion of nitrate into nitrogen gases under anaerobic conditions, resulting in loss of nitrogen from ecosystems. Compare: nitrogen fixation. 2. <chemistry> The removal of nitrogen or nitrogen compounds from a substance. (12 Jan 1998) |
| denitrify | To remove nitrogen from any material or chemical compound. (05 Mar 2000) |
| denitrogenation | Elimination of nitrogen from lungs and body tissues by breathing gases devoid of nitrogen. (05 Mar 2000) |
| Denman | Thomas, English obstetrician, 1733-1815. See: Denman's spontaneous evolution. (05 Mar 2000) |