| Dalrymple's sign | <clinical sign> Retraction of the upper eyelid in Graves' disease, causing abnormal wideness of the palpebral fissure. (05 Mar 2000) |
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| dalton | <unit> A unit of mass that equals the weight of a hydrogen atom, or 1.657 x10-24 grams. Named for John Dalton, an early nineteenth century British chemist who proposed the atomic theory of matter. (09 Oct 1997) |
| Dalton's law | Each gas in a mixture of gases exerts a pressure proportionate to the percentage of the gas and independent of the presence of the other gases present. Synonym: law of partial pressures. (05 Mar 2000) |
| Dalton, John | <person>English chemist, mathematician, and natural philosopher, 1766-1844. See: Dalton's law, Dalton-Henry law, daltonian, daltonism. (05 Mar 2000) |
| Dalton-Henry law | In dissolving a mixture of gases, a liquid will absorb as much of each gas in the mixture as if that were the only gas dissolved. (05 Mar 2000) |
| daltonian | 1. Attributed to or described by John Dalton. 2. Pertaining to daltonism. (05 Mar 2000) |
| daltonism | Inability to perceive or distinguish certain colours, especially. Red; colour blindness. It has various forms and degrees. So called from the chemist Dalton, who had this infirmity. Source: Websters Dictionary (01 Mar 1998) |
| dam | 1. A female parent; used of beasts, especially of quadrupeds; sometimes applied in contempt to a human mother. "Our sire and dam, now confined to horses, are a relic of this age (13th century) . . . .Dame is used of a hen; we now make a great difference between dame and dam." (T. L. K. Oliphant) "The dam runs lowing up end down, Looking the way her harmless young one went." (Shak) 2. A kind or crowned piece in the game of draughts. Origin: OE. Dame mistress, lady; also, mother, dam. See Dame. 1. A barrier to prevent the flow of a liquid; especially, a bank of earth, or wall of any kind, as of masonry or wood, built across a water course, to confine and keep back flowing water. 2. <chemistry> A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace. Dam plate, an iron plate in front of the dam, to strengthen it. Origin: Akin to OLG, D, & Dan. Dam, G. & Sw. Damm, Icel. Dammr, and AS. Fordemman to stop up, Goth. Faordammjan. Source: Websters Dictionary (01 Mar 1998) |
| dam gene | <molecular biology> A gene that codes for the synthesis of a DNA adenine methylase. (09 Oct 1997) |
| dam methylase | <enzyme> An enzyme responsible for the methylation of adenine residues in specific sequences. Synonym: deoxyadenosine methylase. (05 Mar 2000) |
| Dam methyltransferase | <enzyme> From E coli; recognises gatc sequences in E coli k12 DNA and methylates adenosine; not part of the modification system; has been sequenced Registry number: EC 2.1.1.- Synonym: eco dam methylase, p1 dam methylase, t4 dam methylase, t2 dam methylase, dam methylase, dam gene protein, k-12 DNA adenine methylase (26 Jun 1999) |
| Dam unit | A unit of activity of vitamin K; the smallest amount of vitamin K, per gram of chick per day, capable of producing normal coagulability in the blood of K-avitaminotic chicks after 3 days of oral administration. (05 Mar 2000) |
| Dam, C P Henrik | <person>Danish biochemist and Nobel laureate, 1895-1976. See: Dam unit. (05 Mar 2000) |
| dam1bonite | <chemistry> A white crystalline, sugary substance obtained from an African caotchouc. Origin: Cf. F. Dambonite. Source: Websters Dictionary (01 Mar 1998) |
| damage | 1. Injury or harm to person, property, or reputation; an inflicted loss of value; detriment; hurt; mischief. "He that sendeth a message by the hand of a fool cutteth off the feet and drinketh damage." (Prov. Xxvi. 6) "Great errors and absurdities many commit for want of a friend to tell them of them, to the great damage both of their fame and fortune." (Bacon) 2. The estimated reparation in money for detriment or injury sustained; a compensation, recompense, or satisfaction to one party, for a wrong or injury actually done to him by another. In common-law action, the jury are the proper judges of damages. Consequential damage. See Consequential. Exemplary damages, those given for a violation of a right where no actual loss has accrued. Vindictive damages, those given specially for the punishment of the wrongdoer. Synonym: Mischief, injury, harm, hurt, detriment, evil, ill. See Mischief. Origin: OF. Damage, domage, F. Dommage, fr. Assumed LL. Damnaticum, from L. Damnum damage. See Damn. To ocassion damage to the soudness, goodness, or value of; to hurt; to injure; to impair. "He . . . Came up to the English admiral and gave him a broadside, with which he killed many of his men and damaged the ship." (Clarendon) Origin: Cf. OF. Damagier, domagier. See Damage. Source: Websters Dictionary (01 Mar 1998) |