| 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) |
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| rubber dam | In surgery, thin strips of rubber used as a surgical drain or barrier, a thin sheet of rubber with holes that is placed over teeth to isolate them from the oral cavity. (05 Mar 2000) |
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| rubber dam clamp | A springlike metal piece encircling or grasping the cervix of a tooth and so shaped as to prevent a rubber dam from coming off the tooth. (05 Mar 2000) |
| rubber dam clamp forceps | A forceps with pronged jaws designed to engage the jaws of a rubber dam clamp so that they may be separated to pass over the widest buccolingual contour of a tooth. Synonym: rubber dam clamp forceps. (05 Mar 2000) |
| 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, C P Henrik | <person>Danish biochemist and Nobel laureate, 1895-1976. See: Dam unit. (05 Mar 2000) |
| 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) |
| absolute unit | A unit whose value is constant regardless of place or time and not derived from dependent on gravitation. (05 Mar 2000) |
| alexin unit | The smallest amount (highest dilution) of complement that will cause haemolysis of a unit of red blood cells in the presence of a haemolysin unit. Synonym: alexin unit. (05 Mar 2000) |
| Allen-Doisy unit | The quantity of oestrogen capable of producing in a spayed mouse a characteristic change in the vaginal epithelium, namely, disappearance of leukocytes and appearance of cornified cells, as determined by a vaginal smear; equal approximately to one-half of an estrone unit. Synonym: mouse unit. (05 Mar 2000) |
| amboceptor unit | haemolysin unit |
| androgen unit | The androgenic activity of 100 ug (0.1 mg) of crystalline androsterone as assayed by the comb growth response in capons. (05 Mar 2000) |
| antigen unit | The smallest amount of antigen that, in the presence of specific antiserum, will fix 1 complement unit. (05 Mar 2000) |
| antitoxin unit | A unit expressing the strength or activity of an antitoxin; in general, determined with reference to a preserved standard preparation of antitoxin. See: L doses. (05 Mar 2000) |