| translumbar aortography | Early method of aortography by injection into the abdominal aorta through a needle just below the twelfth rib and four fingerbreadths to the left of the spinal processes of the vertebrae. (05 Mar 2000) |
|---|---|
| transluminal percutaneous coronary angioplasty | <cardiology, procedure> Dilatation of an occluded coronary artery (or arteries) by means of a balloon catheter to restore myocardial blood supply. (07 Mar 2000) |
| transmembrane | Through or across a membrane. (05 Mar 2000) |
| transmembrane potential | <physiology> More correctly, transmembrane potential difference: the electrical potential difference across a plasma membrane. See: resting potential, action potential. (18 Nov 1997) |
| transmembrane protein | <cell biology> A protein subunit in which the polypeptide chain is exposed on both sides of the membrane. The term does not apply when different subunits of protein complex are exposed at opposite surfaces. most integral membrane proteins are also transmembrane proteins. (13 Nov 1997) |
| transmembrane transducer | A system that transmits a chemical or electrical signal across a membrane. Usually involves a transmembrane receptor protein that is thought to undergo a conformation change that is expressed on the inner surface of the membrane. Many such transducing species are dimeric and the conformation change may involve interaction between the two components. (18 Nov 1997) |
| transmethylase | <enzyme> That transfers a methyl group from S adenosyl methionine to a substrate. most commonly encountered in bacterial chemotaxis where the methyl accepting chemotaxis proteins (MCPs) become methylated in the course of adaptation. (18 Nov 1997) |
| transmethylation | Transfer of a methyl group from one compound to another; e.g., l-homocysteine is converted to l-methionine by the transfer to the latter of a methyl group. See: methionine synthase. (05 Mar 2000) |
| transmethylation factor | <biochemistry> Esterified in the head group of phospholipids (phosphatidylcholine and sphingomyelin) and in the neurotransmitter acetylcholine. Otherwise a biological source of methyl groups. (18 Nov 1997) |
| transmew | To transmute; to transform; to metamorphose. "To transmew thyself from a holy hermit into a sinful forester." (Sir W. Scott) Origin: F. Transmuer, L. Transmutare. See Transmute. Source: Websters Dictionary (01 Mar 1998) |
| transmigration | Movement from one site to another; may entail the crossing of some usually limiting barrier, as in the passage of blood cells through the walls of the vessels (diapedesis). Origin: L. Trans-migro, pp. -atus, to remove from one place to another (05 Mar 2000) |
| transmissible | Capable of being transmitted (carried across) from one person to another, as a transmissible disease, an infectious or contagious disease. (05 Mar 2000) |
| transmissible dementia | <infectious disease> A very rare form of encephalopathy thought to be caused by a virus (slow-virus), termed a prion. There is little known about the mode of transmission. Human to human transmission has occurred through the use of contaminated brain electrodes and transplantation of infected tissues. The agent can be recovered in the CSF of infected individuals. Standard disinfectants such as formalin, heat, exposure to ultraviolet light or X-rays is ineffective to inactivate the virus. Autoclaving to at least 132 degrees C. Or immersion in 4% sodium hydroxide or 10% sodium hypochlorite solution for 1 hour is recommended for sterilisation. The disease occurs primarily in adults, with peak incidence in the late 50's. Infection results in dementia, myoclonus, ataxia and other neurologic symptoms. The disease progresses rapidly to coma and death after a 3 to 12 month illness. There is no known cure. (27 Sep 1997) |
| transmissible enteritis | An acute or chronic disease of young turkeys caused by bluecomb virus, with diarrhoea, loss of weight, and often cyanosis of the head. Synonym: mud fever, transmissible enteritis. (05 Mar 2000) |
| transmissible gastroenteritis of swine | A rapidly spreading disease of swine, caused by a coronavirus (of the family Coronaviridae) and characterised by severe diarrhoea and vomiting; case fatality rate in pigs younger than 10 days is high; in older pigs it is low. Synonym: porcine transmissible gastroenteritis. (05 Mar 2000) |