| deacetoxycephalosporin C hydroxylase | <enzyme> From streptomyces clavuligerus; hydroxylates deacetoxycephalosporin c at the c3 methyl group to yield deacetylcephalosporin c Registry number: EC 1.14.11.- Synonym: daoc hydroxylase, deacetylcephalosporin c synthetase, daoc 3'-hydroxylase, ceff gene product (26 Jun 1999) |
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| deacetoxycephalosporin C synthetase | <enzyme> Converts penicillin n by oxidative expansion of the 5-membered ring containing sulfur and nitrogen, transfering methyl side chain into the ring; requires ATP Registry number: EC 5.4.99.- Synonym: penicillin n expandase, daoc synthetase, daoc synthase, cefe protein (26 Jun 1999) |
| deacidification | The removal or neutralization of acid. (05 Mar 2000) |
| deacon | 1. An officer in Christian churches appointed to perform certain subordinate duties varying in different communions. In the Roman Catholic and Episcopal churches, a person admitted to the lowest order in the ministry, subordinate to the bishops and priests. In Presbyterian churches, he is subordinate to the minister and elders, and has charge of certain duties connected with the communion service and the care of the poor. In Congregational churches, he is subordinate to the pastor, and has duties as in the Presbyterian church. 2. The chairman of an incorporated company. Origin: OE. Diakne, deakne, deken, AS. Diacon, deacon, L. Diaconus, fr. Gr. A servant or minister, a minister of the church; of uncertain origin. In sense 2 prob. Confused with dean. Source: Websters Dictionary (01 Mar 1998) |
| deaconess | A woman set apart for church work by a bishop. A woman chosen as a helper in church work, as among the Congregationalists. Source: Websters Dictionary (01 Mar 1998) |
| deactivation | The process of rendering or of becoming inactive. (05 Mar 2000) |
| deacylase | 1. A member of the subclass of hydrolases (EC class 3), especially of that subclass of esterases, lipases, lactonases, and hydrolases (EC subclass 3.1). 2. Any enzyme catalyzing the hydrolytic cleavage of an acyl group (R-CO-) in an ester linkage; also includes enzymes cleaving amide linkages (EC subclass 3.5) and similar acyl compounds. (05 Mar 2000) |
| dead | 1. Deprived of life; opposed to alive and living; reduced to that state of a being in which the organs of motion and life have irrevocably ceased to perform their functions; as, a dead tree; a dead man. "The queen, my lord, is dead." "The crew, all except himself, were dead of hunger." (Arbuthnot) "Seek him with candle, bring him dead or living." (Shak) 2. Destitute of life; inanimate; as, dead matter. 3. Resembling death in appearance or quality; without show of life; deathlike; as, a dead sleep. 4. Still as death; motionless; inactive; useless; as, dead calm; a dead load or weight. 5. So constructed as not to transmit sound; soundless; as, a dead floor. 6. Unproductive; bringing no gain; unprofitable; as, dead capital; dead stock in trade. 7. Lacking spirit; dull; lusterless; cheerless; as, dead eye; dead fire; dead colour, etc. 8. Monotonous or unvaried; as, a dead level or pain; a dead wall. "The ground is a dead flat." 9. Sure as death; unerring; fixed; complete; as, a dead shot; a dead certainty. "I had them a dead bargain." (Goldsmith) 10. Bringing death; deadly. 11. Wanting in religious spirit and vitality; as, dead faith; dead works. "Dead in trespasses." 12. Flat; without gloss; said of painting which has been applied purposely to have this effect. Not brilliant; not rich; thus, brown is a dead colour, as compared with crimson. 13. Cut off from the rights of a citizen; deprived of the power of enjoying the rights of property; as, one banished or becoming a monk is civilly dead. 14. <machinery> Not imparting motion or power; as, the dead spindle of a lathe, etc. See Spindle. Dead ahead, a wind directly ahead, or opposed to the ship's course. To be dead, to die. "I deme thee, thou must algate be dead." (Chaucer) Synonym: Inanimate, deceased, extinct. See Lifeless. Origin: OE. Ded, dead, deed, AS. Dead; akin to OS. Dd, D. Dood, G. Todt, tot, Icel. Daur, Sw. & Dan. Dod, Goth. Daubs; prop. P. P. Of an old verb meaning to die. See Die, and cf. Death. Source: Websters Dictionary (01 Mar 1998) |
| DEAD box helicase | <enzyme> Family of ATP dependent DNA or RNA helicases with a 4 amino acid consensus, D E A D, that resembles an ATP binding site. Examples, p68, a human nuclear protein involved in cell growth, vasa, a Drosophila protein required for specification of posterior embryonic structures. (18 Nov 1997) |
| dead fingers | Impaired digital circulation, possibly a mild form of Raynaud's disease, marked by a purplish or waxy white colour of the fingers, with subnormal local temperature and paresthesia. Synonym: dead fingers, waxy fingers. Origin: acro-+ G. Asphyxia, stoppage of the pulse (05 Mar 2000) |
| dead foetus syndrome | <obstetrics, syndrome> A syndrome characterised by lengthy intrauterine retention of a dead foetus usually greater than 4 weeks with development of hypofibrinogenaemia and occasionally disseminated intravascular coagulopathy. (05 Mar 2000) |
| dead nerve | <anatomy, nerve> Misnomer for nonvital dental pulp. (05 Mar 2000) |
| dead pulp | Necrosis of the dental pulp which clinically does not respond to thermal stimulation; the tooth may be asymptomatic or sensitive to percussion and palpation. Synonym: dead pulp, nonvital pulp. (05 Mar 2000) |
| dead space | A cavity, potential or real, remaining after the closure of a wound which is not obliterated by the operative technique. See: anatomical dead space, physiologic dead space. (05 Mar 2000) |
| dead tooth | A misnomer for pulpless tooth. (05 Mar 2000) |