| Xe | Symbol for xenon. (05 Mar 2000) |
|---|---|
| xebec | A small three-masted vessel, with projecting bow stern and convex decks, used in the Mediterranean for transporting merchandise, etc. It carries large square sails, or both. Xebecs were formerly armed and used by corsairs. Origin: Sp. Jabegue, formerly spelt xabeque, or Pg. Xabeco; both from Turk. Sumbeki a kind of Asiatic ship; cf. Per. Sumbuk, Ar. Sumbuk a small ship. Source: Websters Dictionary (01 Mar 1998) |
| XEEK1 kinase | <enzyme> Xeek - xenopus egg and embryo kinase; expressed in early xenopus embryos; 35% identity with snf1 protein kinase; genbank u24435 Registry number: EC 2.7.10.- Synonym: xeek1 gene product (26 Jun 1999) |
| xeme | <zoology> An Arctic fork-tailed gull (Xema Sabinii). Source: Websters Dictionary (01 Mar 1998) |
| xenarthra | An order of new world mammals characterised by the absence of incisors and canines from among their teeth, and comprising the armadillos, the sloths, and the anteaters. The order is distinguished from all others by what are known as xenarthrous vertebrae (xenos, strange; arthron, joint): there are secondary, and sometimes even more, articulations between the vertebrae of the lumbar series. The order was formerly called edentata. (12 Dec 1998) |
| xeno- | Strange; foreign material; parasite. See: hetero-, allo-. Origin: G. Xenos, guest, host, stranger, foreign (05 Mar 2000) |
| xenoantigen | <immunology> An antigen found in more than one species. (06 May 1997) |
| xenobiotic | <chemistry> A completely synthetic chemical compound which does not naturally occur on earth and thus believed to be resistant to environmental degradation. <biochemistry> A branch of biotechnology called bioremediation is seeking to develop biological methods to degrade such compounds. (13 Nov 1997) |
| xenobiotic medium chain fatty acid - coenzyme A ligase | <enzyme> Partial amino acid sequence of enzyme from bovine liver mitochondria given I first source; has high sequence homology to human and rat sa protein Registry number: EC 6.2.1.- Synonym: xl-i ligase, xl-i carboxylic acid - CoA ligase (26 Jun 1999) |
| xenobiotic metabolism | <biochemistry> This is the sum of the physical and chemical changes that affect foreign substances in living organisms from uptake to excretion. (09 Oct 1997) |
| xenobiotics | Chemical substances that are foreign to the biological system. They include naturally occurring compounds, drugs, environmental agents, carcinogens, insecticide, etc. (12 Dec 1998) |
| xenodiagnosis | <microbiology> A method of diagnosis based on exposing a parasite-free normal host to the parasite and then examining the host for parasites. (09 Oct 1997) |
| xenogamy | <botany> Cross fertilization. Origin: Gr. Xenos strange, foreign + marriage. Source: Websters Dictionary (01 Mar 1998) |
| xenogeneic | <pathology> Literally, of foreign genetic stock, usually applied to tissue or cells from another species, as in xenogeneic transplantation. (18 Nov 1997) |
| xenogeneic graft | <surgery> A surgical graft of tissue from one species onto or into individuals of unlike species, genus or family. Also know as a heteroplastic graft. See: xenotransplantation. (11 May 1997) |