| gel filtration | <molecular biology> An important method for separating molecules according to molecular size by percolating the solution through beads of solvent permeated polymer that has pores of similar size to the solvent molecules. Unlike a continous filter that retards flow according to molecular size, separation is achieved because molecules that can enter the beads take a longer path (i.e. Are retarded) than those that cannot. Typical gels for protein separation are made from polyacrylamide or from flexible (Sephadex) or rigid (agarose, Sepharose) sugar polymers. The size separation range is determined by the degree of cross linking of the gel. (05 May 1997) |
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| gel filtration chromatography | See: gel filtration. (05 Mar 2000) |
| gel retardation assay | A lab technique used to find out if there are proteins binding a fragment of DNA (in a DNA-protein complex) by watching how fast the DNA fragment moves through an electric field and seeing whether it moves slower when a particular protein is also present. (09 Oct 1997) |
| gel structure | Brush heap structure of fibrils giving firmness to hydrocolloids. (05 Mar 2000) |
| gel transfer | Any lab technique used to transfer substances which had been separated using gel electrophoresis from the gel to a membrane for further processing or analysis. For example: any type of blotting. (09 Oct 1997) |
| gelada | <zoology> A baboon (Gelada Ruppelli) of Abyssinia, remarkable for the length of the hair on the neck and shoulders of the adult male. Source: Websters Dictionary (01 Mar 1998) |
| gelasmus | Rarely used term for spasmodic, hysterical laughter. Origin: Gr. Gelasma, a laugh, fr. Gelao, to laugh (05 Mar 2000) |
| gelastic | Pertaining to laughter; used in laughing. "Gelastic muscles." Origin: Gr. Inclined to laugh, from to laugh. Source: Websters Dictionary (01 Mar 1998) |
| gelastic seizure | A seizure characterised by laughing. This seizure type is often accompanied by hypothalamic lesions, such as hamartomas. (05 Mar 2000) |
| gelate | 1. To convert into gelatin. 2. To become gelatinous. Synonym: gelate. (05 Mar 2000) |
| gelatification | <physiology> The formation of gelatin. Origin: Gelatin + L. -ficare. (in comp) to make. See -fy. Source: Websters Dictionary (01 Mar 1998) |
| gelatigenous | <physiology> Producing, or yielding, gelatin; gelatiniferous; as, the gelatigeneous tissues. Origin: Gelatin + -genous. Source: Websters Dictionary (01 Mar 1998) |
| gelatin | <protein> Heat denatured collagen. (18 Nov 1997) |
| gelatin sponge, absorbable | <chemical> Sterile, gelatin-base surgical sponge applied topically as an adjunct to haemostasis when the control of bleeding by conventional procedures is ineffective to reduce capillary ooze or is impractical. Pharmacological action: haemostatics. (12 Dec 1998) |
| gelatin sugar | <amino acid, physiology> The simplest amino acid. It is a common residue in proteins, especially collagen and elastin and is not optically active. It is also a major inhibitory neurotransmitter in spinal cord and brainstem of vertebrate central nervous system. (18 Nov 1997) |