| NO | Symbol for nitric oxide. (05 Mar 2000) |
|---|---|
| no reflow phenomenon | Absence of blood flow in a portion of the brain which has been damaged, usually by ischemia. (05 Mar 2000) |
| NO synthase | <enzyme> An enzyme that catalyses the conversion of l-arginine, NADPH, and oxygen to citrulline, nitric oxide, and NADP+. The enzyme found in brain, but not that induced in lung or liver by endotoxin, requires calcium.There are two isoforms, one constitutive and one activated by calmodulin. Chemical name: L-Arginine,NADPH:oxygen oxidoreductase (nitric-oxide-forming) Registry number: EC 1.14.13.39 Acronym: NOS (12 Dec 1998) |
| no-observed-adverse-effect level | The highest dosage administered that does not produce toxic effects. The noael will depend on how closely dosages are spaced (lowest-observed-adverse-effect level and no-observed-effect level) and the number of animals examined. The ultimate objective is usually to determine not the "safe" dosage in laboratory animals but the "safe" dosage for humans. Therefore, the extrapolation most often required of toxicologists is from high-dosage studies in laboratory animals to low doses in humans. (casarett and doull's toxicology: the basic science of poisons, 4th ed) (12 Dec 1998) |
| no-threshold concept | That the biologic effect of radiation is proportional to dose, even for minutely small doses. (05 Mar 2000) |
| Noack's syndrome | Congenital malformation in which oxycephaly, brachysyndactyly of hand, and preaxial polydactyly of feet are associated with mental retardation; it is usually inherited as an autosomal recessive trait but there is also a dominant form. Synonym: Carpenter's syndrome, Goodman's syndrome, Noack's syndrome, Sakati-Nyhan syndrome. (05 Mar 2000) |
| Noack, M | <person> 20th century German physician. See: Noack's syndrome. (05 Mar 2000) |
| noah | A patriarch of Biblical history, in the time of the Deluge. Noah's ark. <zoology> A marine bivalve shell (Arca Noae), which somewhat resembles an ark, or ship, in form. A child's toy, consisting of an ark-shaped box containing many different wooden animals. Origin: Heb. Noakh rest. Source: Websters Dictionary (01 Mar 1998) |
| nobelium | <chemical> Nobelium. A man-made radioactive element of the actinide metal series. It has the atomic symbol no, atomic number 102, and atomic weight 259. Chemical name: Nobelium (12 Dec 1998) |
| nobility | 1. The quality or state of being noble; superiority of mind or of character; commanding excellence; eminence. "Though she hated Amphialus, yet the nobility of her courage prevailed over it." (Sir P. Sidney) "They thought it great their sovereign to control, And named their pride nobility of soul." (Dryden) 2. The state of being of high rank or noble birth; patrician dignity; antiquity of family; distinction by rank, station, or title, whether inherited or conferred. "I fell on the same argument of preferring virtue to nobility of blood and titles, in the story of Sigismunda." (Dryden) 3. Those who are noble; the collictive body of nobles or titled persons in a stste; the aristocratic and patrician class; the peerage; as, the English nobility. Origin: L. Nobilitas: cf. OF. Nobilite. See Noble. Source: Websters Dictionary (01 Mar 1998) |
| noble | 1. Possessing eminence, elevation, dignity, etc.; above whatever is low, mean, degrading, or dishonorable; magnanimous; as, a noble nature or action; a noble heart. "Statues, with winding ivy crowned, belong To nobler poets for a nobler song." (Dryden) 2. Grand; stately; magnificent; splendid; as, a noble edifice. 3. Of exalted rank; of or pertaining to the nobility; distinguished from the masses by birth, station, or title; highborn; as, noble blood; a noble personage. Noble is used in the formation of self-explaining compounds; as, noble-born, noble-hearted, noble-minded. <chemistry> Noble metals, silver, gold, and platinum; so called from their freedom from oxidation and permanence in air. Copper, mercury, aluminium, palladium, rhodium, iridium, and osmium are sometimes included. Synonym: Honorable, worthy, dignified, elevated, exalted, superior, sublime, great, eminent, illustrious, renowned, stately, splendid, magnificent, grand, magnanimous, generous, liberal, free. Origin: F. Noble, fr. L. Nobilis that can be or is known, well known, famous, highborn, noble, fr.noscere to know. See know. 1. A person of rank above a commoner; a nobleman; a peer. 2. An English money of account, and, formerly, a gold coin, of the value of 6 s. 8 d. Sterling, or about $1.61. 3. <zoology> A European fish; the lyrie. Source: Websters Dictionary (01 Mar 1998) |
| noble element | A metal that cannot be oxidised by heat alone, nor readily dissolved by acid; e.g., gold, platinum. Synonym: noble element. (05 Mar 2000) |
| noble gases | Gases which are members of the zero group of the periodic system. These gases generally do not react chemically. (12 Dec 1998) |
| noble metal | A metal that cannot be oxidised by heat alone, nor readily dissolved by acid; e.g., gold, platinum. Synonym: noble element. (05 Mar 2000) |
| Noble's position | Patient standing and bent slightly forward; useful for inspection of a swelling of the loin that may occur with pyelonephritis. (05 Mar 2000) |