| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
|---|---|
| SAT | saliva alcohol test; satellite; serum antitrypsin; single-agent chemotherapy; slide agglutination te... |
| SRA | segmental renal artery; serum renin activity; spleen repopulating activity |
| TAT | tetanus antitoxin; thematic apperception test; thematic aptitude test; thrombin-antithrombin complex... |
| TGA | taurocholate gelatin agar; thyroglobulin activity; total glycoalkaloids; total gonadotropin activity... |
| gamma-l-glutamyl-l-cysteinylglycine | <biochemistry> The tripeptide _ glutamylcysteinylglycine. It contains an unusual peptide linkage between the _ carboxyl group of the glutamate side chain and the amine group of cysteine. The concentration of glutathione in animal cells is _5mM and its sulphydryl group is kept largely in the reduced state. This allows it to act as a sulphydryl buffer, reducing any disulphide bonds formed within cytoplasmic proteins to cysteines. Hence, few, if any, cytoplasmic proteins contain disulphide bonds. Glutathione is also important as a cofactor for the enzyme glutathione peroxidase, in the uptake of amino acids and participates in leucotriene synthesis. (18 Nov 1997) |
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| gamma-linolenic acid | <chemical> (z,z,z)-6,9,12-octadecatrienoic acid. An omega-6 fatty acid produced in the body as the delta 6-desaturase metabolite of linoleic acid. It is converted to dihomo-gamma-linolenic acid, a biosynthetic precursor of monoenoic prostaglandins such as pge1. Chemical name: 6,9,12-Octadecatrienoic acid, (Z,Z,Z)- (12 Dec 1998) |
| gamma loop | The reflex arc consisting of small anterior horn cells and neuroma, their small fibres projecting to the intrafusal bundle producing its contraction, which initiates the afferent impulses that pass through the posterior root to the anterior horn cells, inducing a stretch reflex. Synonym: gamma motor neurons, gamma motor system, Granit's loop. (05 Mar 2000) |
| gamma motor neurons | The reflex arc consisting of small anterior horn cells and neuroma, their small fibres projecting to the intrafusal bundle producing its contraction, which initiates the afferent impulses that pass through the posterior root to the anterior horn cells, inducing a stretch reflex. Synonym: gamma motor neurons, gamma motor system, Granit's loop. (05 Mar 2000) |
| gamma motor system | The reflex arc consisting of small anterior horn cells and neuroma, their small fibres projecting to the intrafusal bundle producing its contraction, which initiates the afferent impulses that pass through the posterior root to the anterior horn cells, inducing a stretch reflex. Synonym: gamma motor neurons, gamma motor system, Granit's loop. (05 Mar 2000) |
| gamma-oxalomesaconate hydratase | <enzyme> From pseudomonas ochraceae; forms gamma-oxalocitramalate Registry number: EC 4.2.1.- Synonym: gom hydratase (26 Jun 1999) |
| gamma radiation | Ionizing electromagnetic radiation resulting from nuclear processes, such as radioactive decay or fission. (05 Mar 2000) |
| gamma ray | <radiobiology> Electromagnetic radiation (photons) with energies greater than (roughly) 100 keV (that is, 100,000 electron volts). Gamma radiation frequently accompanies alpha and beta decays, and always accompanies fission. Gamma rays are highly penetrating and are best shielded against using dense materials, such as lead or depleted uranium. (Gamma rays are similar to X-rays, but are generally higher in energy and nuclear in origin.) Gamma rays have wavelengths of 1 nanometre or shorter. These are highly energised, deeply penetrating photons which can be emitted from an atomic nucleus during nuclear fission (the splitting of an atom) and during regular atomic decay (radioactivity). (13 Oct 1997) |
| gamma ray knife | A beam of high energy X-rays. See: radiosurgery. (05 Mar 2000) |
| gamma rays | Very powerful and penetrating, high-energy electromagnetic radiation of shorter wavelength than that of X-rays. They are emitted by a decaying nucleus, usually between 0.01 and 10 mev. They are also called nuclear X-rays. (12 Dec 1998) |
| gamma subunit, cGMP phosphodiesterase | <enzyme> Isolated from canine retinal rod photoreceptor cells; genbank u49359 Registry number: EC 3.1.14.- Synonym: pde-gamma, pdegamma, cgmp-pde gamma subunit (26 Jun 1999) |
| gamma-tocopherol | 7,8-Dimethyltocol;a form biologically less active than alpha-gamma-tocopherol (05 Mar 2000) |
| gamma-tocopherol methyltransferase | <enzyme> Forms alpha-tocopherol; enzyme nomenclature name of tocopherol o-methyltransferase is incorrect, since there are no -och3 groups in the product Registry number: EC 2.1.1.95 Synonym: gtc methyltransferase (26 Jun 1999) |
| gamma-tolerance | The tolerance of a person or a piece of equipment to forces that develop as a result of acceleration or deceleration. (05 Mar 2000) |
| gamma toxin | <microbiology> Complex toxin (33.4 kD) produced by Staphylococcus aureus. Rabbit erythrocytes are particularly sensitive to lysis by the toxin, but the mechanism is unknown. (18 Nov 1997) |