| V-type ATPase | <enzyme> From eukaryotic endomembrane systems, including vacuoles, lysosomes, golgi apparatus, chromaffin granules and coated vesicles. One of three major classes of ion transport ATPase, characterised by a multi subunit structure and a lack of a phosphorylated intermediate. Found in archaebacteria but not eubacteria, in the intracellular acidic vacuoles and in some proton pumping epithelia (e.g. Intercalated cells of kidney). A complex enzyme encoded by several genes, involved in ion translocation but does not act via phosphorylated enzyme intermediate See: P-type ATPase. Registry number: EC 3.6.1.- Synonym: atpase, v-type, atpase, vacuolar, vacuolar atpase, v-atpase, vacuolar h+-atpase, vacuolar membrane h(+)-atpase, vha55 gene product, vma16 gene product (26 Jun 1999) |
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| V-Y flap | A flap in which the incision is made in a V shape and sutured in a Y shape to gain additional tissue. Synonym: V-Y plasty, V-Y procedure. (05 Mar 2000) |
| V-Y plasty | A flap in which the incision is made in a V shape and sutured in a Y shape to gain additional tissue. Synonym: V-Y plasty, V-Y procedure. (05 Mar 2000) |
| V-Y procedure | A flap in which the incision is made in a V shape and sutured in a Y shape to gain additional tissue. Synonym: V-Y plasty, V-Y procedure. (05 Mar 2000) |
| v/q mismatch | <radiology> Mnemonic: FEV ONE, F fibrosing mediastinitis, E effusion, V vasculitis, O one pulmonary artery (or hypoplasia), N neoplasm, E embolism (12 Dec 1998) |
| V2 protease | <enzyme> Isolated from virulent strain of dichelobacter nodosus; differs from b2 protease by a single amino acid at position 219; genbank l38395 Registry number: EC 3.4.21.- Synonym: aprv2 gene product, dn aprv2 gene product (26 Jun 1999) |
| V8 protease | <enzyme> Protease from Staphylococcus aureus strain V8. Cleaves peptide bonds on the carboxyl side of aspartic and glutamic acid residues. Used experimentally for selective cleavage of proteins for amino acid sequence determination or peptide mapping. (18 Nov 1997) |
| va'gi eminentia | A prominence in the floor of the inferior fovea of the fourth ventricle that overlies the dorsal motor nucleus of the vagus. Synonym: trigonum nervi vagi, ala cinerea, ashen wing, gray wing, trigone of vagus nerve, va'gi eminentia. (05 Mar 2000) |
| Va/Q | <abbreviation> Ventilation/perfusion ratio. (05 Mar 2000) |
| vaagmer | <zoology> The dealfish. Alternative forms: vaagmaer, and vaagmar. Origin: Icel. Vagmeri a kind of flounder, literally, wave mare. Source: Websters Dictionary (01 Mar 1998) |
| VAC | <abbreviation> Ventriculoatrial conduction. (05 Mar 2000) |
| vacation | 1. The act of vacating; a making void or of no force; as, the vacation of an office or a charter. 2. Intermission of a stated employment, procedure, or office; a period of intermission; rest; leisure. "It was not in his nature, however, at least till years had chastened it, to take any vacation from controversy." (Palfrey) Hence, specifically: - Intermission of judicial proceedings; the space of time between the end of one term and the beginning of the next; nonterm; recess. "With lawyers in the vacation." The intermission of the regular studies and exercises of an educational institution between terms; holidays; as, the spring vacation. The time when an office is vacant; especially. The time when a see, or other spiritual dignity, is vacant. Origin: F, fr. L. Vacatio a being free from a duty, service, etc, fr. Vacare. See Vacate. Source: Websters Dictionary (01 Mar 1998) |
| vaccenic acid | CH3(CH2)5CH==CH(CH2)9COOH; n-trans-11-octadecenoic acid;an unsaturated fatty acid of which both cis and trans isomers are found in butter and other animal fats. (05 Mar 2000) |
| vaccina | <medicine> Vaccinia. Source: Websters Dictionary (01 Mar 1998) |
| vaccinal | <medicine> Of or pertaining to vaccinia or vaccination. Source: Websters Dictionary (01 Mar 1998) |