| selachian | <zoology> One of the Selachii. Source: Websters Dictionary (01 Mar 1998) |
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| selachii | <zoology> An order of elasmobranchs including the sharks and rays; the Plagiostomi. Synonym: Selacha, Selache, and Selachoidei. Origin: NL, fr. Gr. A fish having cartilages instead of bones. Source: Websters Dictionary (01 Mar 1998) |
| selachoidei | <zoology> Same as Selachii. Origin: NL. See Selachii, and -oid. Source: Websters Dictionary (01 Mar 1998) |
| selachostomi | <zoology> A division of ganoid fishes which includes the paddlefish, in which the mouth is armed with small teeth. Origin: NL. See Selachii, and Stoma. Source: Websters Dictionary (01 Mar 1998) |
| selaginella | <botany> A genus of cryptogamous plants resembling Lycopodia, but producing two kinds of spores; also, any plant of this genus. Many species are cultivated in conservatories. Origin: NL, fr. L. Selago, -inis, a kind of plant. Source: Websters Dictionary (01 Mar 1998) |
| selah | A word of doubtful meaning, occuring frequently in the Psalms; by some, supposed to signify silence or a pause in the musical performance of the song. "Beyond the fact that Selach is a musical term, we know absolutely nothing about it." (Dr. W. Smith (Bib. Dict)) Origin: Heb. Selah. Source: Websters Dictionary (01 Mar 1998) |
| selaphobia | <psychology> Rarely used term for a morbid fear of a flash of light. Origin: G. Selas, light, + phobos, fear (05 Mar 2000) |
| selch | <zoology> A seal. Source: Websters Dictionary (01 Mar 1998) |
| Seldinger technique | A method of percutaneous insertion of a catheter into a blood vessel or space, such as an abscess cavity: a needle is used to puncture the structure and a guide wire is threaded through the needle; when the needle is withdrawn, a catheter is threaded over the wire; the wire is then withdrawn, leaving the catheter in place. (05 Mar 2000) |
| Seldinger, Sven Ivar | <person> Swedish radiologist, *1921. See: Seldinger technique. (05 Mar 2000) |
| selectable marker | <molecular biology> A gene whose expression allows one to identify cells that have been transforrned or transfected with a vector containing the marker gene. (09 Oct 1997) |
| Selected Area Electron Diffraction | <technique> In this diffraction mode an aperture is used to define the area from which a diffraction pattern is to be recorded from a thin sample. This aperture is typically located in an image plane below the sample. Selected Area Electron Diffraction patterns are simple spot patterns and are of use in phase determination (lattice spacing measurement) and defect analysis (sample orientation). Acronym: SAED (05 Aug 1998) |
| selectin | <protein> Group of cell adhesion molecules that bid to carbohydrates via a lectin like domain. The name is derived from select and lectin. They are integral membrane glycoproteins with an N terminal, C type lectin domain, followed by an EGF like domain, a variable number of repeats of the short consensus sequence of complement regulatory proteins and a single transmembrane domain. Three selectins have been identified and are distinguished by capital letters based on the source of the original identification i.e. E selectin, L selectin and P selectin. (18 Nov 1997) |
| selectins | Family of cell adhesion molecules consisting of a lectin-like domain, an epidermal growth factor-like domain, and a variable number of domains that encode proteins homologous to complement-binding proteins. Selectins mediate the binding of leukocytes to the vascular endothelium. (12 Dec 1998) |
| selection | <biology> Placing organisms under conditions where the growth of those with a particular genotype will be favored. (09 Oct 1997) |