| semivalent | Denoting the ability to form a one-electron bond. (05 Mar 2000) |
|---|---|
| semivertical heart | Loosely descriptive of the heart's electrical axis when this is directed at approximately +60 |
| Semliki forest virus | <virology> Enveloped virus of the alphavirus group of Togaviridae. First isolated from mosquitoes in the Semliki Forest in Uganda, not known to cause any illness. The synthesis and export of its three spike glycoproteins, via the endoplasmic reticulum and Golgi complex, have been used as a model for the synthesis and export of plasma membrane proteins. (18 Nov 1997) |
| semnifical | <biology> Forming or producing seed, or the male generative product of animals or of plants. Origin: L. Semen, seminis, seed + facere = to make. Source: Websters Dictionary (01 Mar 1998) |
| Semon's law | An obsolete law stating that injury to the recurrent laryngeal nerve results in paralysis of the abductor muscle of the vocal cords before paralysis of the adductor muscles. (05 Mar 2000) |
| Semon, Richard | <person> German biologist, 1859-1908. See: Semon-Hering theory. (05 Mar 2000) |
| Semon, Sir Felix | <person> German laryngologist in Britain, 1849-1921. See: Semon's law, Gerhardt-Semon law. (05 Mar 2000) |
| Semon-Hering theory | The theory that stimuli or irritants leave definite traces (engrams) on the protoplasm of the animal or plant, and when these stimuli are regularly repeated they induce a habit which persists after the stimuli cease; assuming that the germ cells share with the nerve cells in the possession of engrams, acquired habits may thus be transmitted to the descendants. Synonym: mnaemic theory, mnemism, Semon-Hering theory. (05 Mar 2000) |
| sempervive | <botany> The houseleek. Origin: L. Semperviva, sempervivum, fr. Sempervivus ever-living; semper always + vivus living. Source: Websters Dictionary (01 Mar 1998) |
| sempervivum | <botany> A genus of fleshy-leaved plants, of which the houseleek (Sempervivum tectorum) is the commonest species. Source: Websters Dictionary (01 Mar 1998) |
| Semple vaccine | A modification of the original (Pasteur) rabies vaccine, formerly widely used in the U.S., prepared from rabbit nerve tissue, inactivated with phenol and administered in 14 to 21 daily injections; has variable potency and is associated with a high incidence of postvaccinal demyelination. (05 Mar 2000) |
| Semple, Sir David | <person> English physician, 1856-1937. See: Semple vaccine. (05 Mar 2000) |
| semuncia | A Roman coin equivalent to one twenty-fourth part of a Roman pound. Origin: L, fr. Semi half + uncia ounce. Source: Websters Dictionary (01 Mar 1998) |
| semustine | <chemical> 1-(2-chloroethyl)-3-(4-methylcyclohexyl)-1-nitrosourea. 4-methyl derivative of lomustine (ccnu). An antineoplastic agent which functions as an alkylating agent. Pharmacological action: antineoplastic agent, alkylating. Chemical name: Urea, N-(2-chloroethyl)-N'-(4-methylcyclohexyl)-N-nitroso- (12 Dec 1998) |