| vection | Transference of the agents of disease from an infected to an uninfected individual by a vector. Origin: L. Vectio, conveyance (05 Mar 2000) |
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| vectis | An instrument resembling one of the blades of an obstetrical forceps, used as an aid in delivery by making leverge on the presenting part of the foetus. Origin: L. A lever or bar (05 Mar 2000) |
| vector | 1. <mathematics> A term to describe something that has both direction and magnitude. 2. <molecular biology> Commonly term for a plasmid that can be used to transfer DNA sequences from one organism to another. Different vectors may have properties particularly appropriate to give protein expression in the recipient or for cloning or may have different selectable markers. Recombinant DNA systems especially suited for production of large quantities of specific proteins in bacterial, yeast, insect, or mammalian cell systems. See: transfection. (05 Mar 2000) |
| vector loop | <physiology> An irregular, usually elliptical, curve representing the average direction and magnitude of the heart's action from moment to moment throughout the cardiac cycle. See: vector, vectorcardiogram. (06 Mar 2000) |
| vector-borne | Denoting a disease or infection that is transmitted by an invertebrate vector. (05 Mar 2000) |
| vectorcardiogram | <physiology> A graphic representation of the magnitude and direction of the heart's action currents in the form of vector loops. (05 Mar 2000) |
| vectorcardiography | <physiology> Recording of the moment-to-moment electromotive forces of the heart on a plane of the body surface delineated as a vector function of time. (12 Dec 1998) |
| vectorial | Relating in any way to a vector. (05 Mar 2000) |
| vectorial capacity | <epidemiology> In vector-borne infections such as malaria, the vectorial capacity is a concept analogous to the contact rate in directly-transmitted diseases. It is, thus, a function of (a) the vector's density in relation to its vertebrate host, (b) the frequency with which it takes blood meals on the host species, (c) the duration of the latent period in the vector, and (d) the vector's life expectancy. (05 Dec 1998) |
| vectorial synthesis | <cell biology> Term usually applied to the mode of synthesis of proteins destined for export from the cell. As the protein is made it moves (vectorially) through the membrane of the rough endoplasmic reticulum, to which the ribosome is attached and into the cisternal space. (06 Mar 2000) |
| vectorial transport | <physiology> Transport of an ion or molecule across an epithelium in a certain direction (e.g. absorption of glucose by the gut). Vectorial transport implies a nonuniform distribution of transport proteins on the plasma membranes of two faces of the epithelium. (06 Mar 2000) |
| vecuronium bromide | <chemical> Monoquaternary homolog of pancuronium. A non-depolarising neuromuscular blocking agent with shorter duration of action than pancuronium. Its lack of significant cardiovascular effects and lack of dependence on good kidney function for elimination as well as its short duration of action and easy reversibility provide advantages over, or alternatives to, other established neuromuscular blocking agents. Pharmacological action: neuromuscular nondepolarising agents, nicotinic antagonists. Chemical name: Piperidinium, 1-((2beta,3alpha,5alpha,16beta,17beta)-3,17-bis(acetyloxy)-2-(1-piperidinyl)androstan-16-yl)-1-methyl-, bromide (12 Dec 1998) |
| VEE | <abbreviation> Venezuelan equine encephalomyelitis. (05 Mar 2000) |
| VEE virus | A group A arbovirus of the genus Alphavirus, family Togaviridae, occurring in Venezuela and several other South American countries, in Panama and Trinidad, and occasionally the United States causing Venezuelan equine encephalomyelitis in horses and humans; it seems to be more viscerotropic than neurotropic; the virus is transmitted by Culex mosquitoes. Synonym: VEE virus. (05 Mar 2000) |
| veery | <zoology> An American thrush (Turdus fuscescens) common in the Northern United States and Canada. It is light tawny brown above. The breast is pale buff, thickly spotted with brown. Called also Wilson's thrush. "Sometimes I hear the veery's clarion." (Thoreau) Source: Websters Dictionary (01 Mar 1998) |