| vacuolar 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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| vacuolar calcium ATPase | <enzyme> Isolated from saccharomyces cerevisiae; genbank u36603 Registry number: EC 3.6.1.- Synonym: h(+)-ca(2+)-atpase, vacuolar (26 Jun 1999) |
| vacuolar degeneration | Formation of nonlipid vacuoles in cytoplasm, most frequently due to accumulation of water by cloudy swelling. (05 Mar 2000) |
| vacuolar nephrosis | Vacuolation of the epithelial cytoplasm of renal convoluted tubules in patients seriously depleted of potassium; vacuoles do not contain fat or glycogen, concentrating ability is impaired, polyuria and polydipsia are common, and pyelonephritis may develop. Synonym: vacuolar nephrosis. (05 Mar 2000) |
| vacuolate | Vacuolated Having vacuoles. (05 Mar 2000) |
| vacuolated | <biology> Full of vacuoles, or small air cavities; as, vacuolated cells. Source: Websters Dictionary (01 Mar 1998) |
| vacuolating virus | Any of a number of virus's, belonging to various families, isolated from monkeys or from cultures of monkey cells. Synonym: vacuolating virus. (05 Mar 2000) |
| vacuolation | <biology> Formation into, or multiplication of, vacuoles. Source: Websters Dictionary (01 Mar 1998) |
| vacuole | <cell biology> Membrane bounded vesicle of eukaryotic cells. Secretory, endocytotic and phagocytotic vesicles can be termed vacuoles. Botanists tend to confine the term to the large vesicles found in plant cells that provide both storage and space filling functions. (18 Nov 1997) |
| vacuoles | Any spaces or cavities within a cell. They may function in digestion, storage, secretion, or excretion. (12 Dec 1998) |
| vacuolization | <biology> Formation into, or multiplication of, vacuoles. Source: Websters Dictionary (01 Mar 1998) |
| vacuome | A system of vacuoles that can be stained with neutral red in the living cell. Origin: vacuole + G. -oma, tumour (05 Mar 2000) |
| vacuous | Empty; unfilled; void; vacant. "Boundless the deep, because I am who fill Infinitude; nor vacuous the space." (Milton) "That the few may lead selfish and vacuous days." (J. Morley) Origin: L. Vacuus. See Vacant. Source: Websters Dictionary (01 Mar 1998) |
| vacutome | Electrodermatome that applies suction to the skin to raise it before an advancing blade, usually for taking a split-thickness skin graft. Origin: vacuum + G. Tome, a cutting (05 Mar 2000) |
| vacuum | Origin: L, fr. Vacuus empty. See Vacuous. 1. <physics> A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum. 2. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch. Vacuum brake, a kind of continuous brake operated by exhausting the air from some appliance under each car, and so causing the pressure of the atmosphere to apply the brakes. <medicine> Vacuum pan, a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube. Vacuum valve, a safety valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, in order to prevent collapse. Torricellian vacuum. See Torricellian. Source: Websters Dictionary (01 Mar 1998) |