| VPC | vapor-phase chromatography; ventricular premature complex; ventricular premature contraction; volume... |
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| HPLC | high-performance liquid chromatography; high-power liquid chromatography; high-pressure liquid chrom... |
| VPI | vapor phase inhibitor; velopharyngeal insufficiency |
| PC | avoirdupois weight [Lat. pondus civile]; packed cells; paper chromatography; paracortex; parent cell... |
| RP-HPLC | reverse phase-high performance liquid chromatography |
| RP-HPLC | chromatography and reversed-phase high-performance liquid chromatography |
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| Phase I | phase |
| S phase | synthesis phase |
| RP HPLC | Reversed phase high performance liquid chromatography |
| RPC | Reversed Phase Chromatography |
| reversed phase chromatography | A form of partitionary chromatography in which the stationary phase is more polar than the mobile phase. (05 Mar 2000) |
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| anaesthetic vapor | The gaseous phase of a liquid anaesthetic with sufficient partial pressure at room temperature to produce general anaesthesia when inhaled. (05 Mar 2000) |
| vapor | To send off in vapor, or as if in vapor; as, to vapor away a heated fluid. Alternative forms: vapour] "He'd laugh to see one throw his heart away, Another, sighing, vapor forth his soul." (B. Jonson) 1. <physics> Any substance in the gaseous, or aeriform, state, the condition of which is ordinarily that of a liquid or solid. The term vapor is sometimes used in a more extended sense, as identical with gas; and the difference between the two is not so much one of kind as of degree, the latter being applied to all permanently elastic fluids except atmospheric air, the former to those elastic fluids which lose that condition at ordinary temperatures. The atmosphere contains more or less vapor of water, a portion of which, on a reduction of temperature, becomes condensed into liquid water in the form of rain or dew. The vapor of water produced by boiling, especially in its economic relations, is called steam. "Vapor is any substance in the gaseous condition at the maximum of density consistent with that condition. This is the strict and proper meaning of the word vapor." (Nichol) 2. In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc. "The vapour which that fro the earth glood [glided]" (Chaucer) "Fire and hail; snow and vapors; stormy wind fulfilling his word." (Ps. Cxlviii. 8) 3. Wind; flatulence. 4. Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting. "For what is your life? It is even a vapor, that appeareth for a little time, and then vanisheth away." (James iv. 14) 5. An old name for hypochondria, or melancholy; the blues. "A fit of vapors." 6. <pharmacology> A medicinal agent designed for administration in the form of inhaled vapor. Vapor bath. A bath in vapor; the application of vapor to the body, or part of it, in a close place; also, the place itself. <chemistry> The relative weight of gases and vapors as compared with some specific standard, usually hydrogen, but sometimes air. The vapor density of gases and vaporizable substances as compared with hydrogen, when multiplied by two, or when compared with air and multiplied by 28.8, gives the molecular weight. Vapor engine, an engine worked by the expansive force of a vapor, especially. A vapor other than steam. Origin: OE. Vapour, OF. Vapour, vapor, vapeur, F. Vapeur, L. Vapor; probably for cvapor, and akin to Gr. Smoke, to breathe forth, Lith. Kvepti to breathe, smell, Russ. Kopote fine soot. Cf. Vapid Alternative forms: vapour. Source: Websters Dictionary (01 Mar 1998) |
| vapor density | The mass per unit volume of a vapor; since the vapor density changes with temperature and pressure, it is commonly expressed as a specific gravity, i.e., the weight of the vapor divided by the weight of an equal volume of a reference gas (e.g., oxygen or hydrogen) at the same temperature and pressure. (05 Mar 2000) |
| vapor pressure | The partial pressure exerted by the vapor phase of a liquid. (05 Mar 2000) |
| mercury vapor lamp | A lamp in which the electric arc is in an ionised mercury vapor atmosphere; it produces ultraviolet light that can be used therapeutically or in diagnostic photometry. (05 Mar 2000) |
| absorption chromatography | <investigation> Techniques for separating molecules based on differential absorption and elution. Term for separation methods involving flow of a fluid carrier over a nonmobile absorbing phase. (18 Nov 1997) |
| adsorption chromatography | Chromatography in which separation of substances is achieved by the difference in degree of adsorption of the compounds to a stationary phase. (05 Mar 2000) |
| affinity chromatography | <investigation> A technique of analytical chemistry used to separate and purify a biological molecule from a mixture, based on the attraction of the molecule of interest to a particular ligand which has been previously attached to a solid, inert substance. The mixture is passed through a column containing the ligand attached to the stationary substance, so that the molecule of interest stays within the column while the rest of the mixture continues through to the end. Then, a different chemical is flushed through the column to detach the molecule from the ligand and bring it out separately from the rest of the mixture. (09 Feb 1998) |
| gas chromatography | <technique> A chromatographic technique (a type of column chromatography) in which the stationary phase is solid while the mobile phase is gaseous samples. The gaseous samples are separated based on their different adsorption ability to the solid phase. (09 Oct 1997) |
| gas-liquid chromatography | <technique> A chemistry lab technique, a type of column chromatography, used to separate the components of a mixed substance. The substance is held stationary by an inert solid coated with an inert liquid which is not likely to evaporate (i.e. Is nonvolatile), while a gas (called an eluant) flows past it bringing out the components one at a time. (09 Oct 1997) |
| paper chromatography | <technique> Separation method in which filter paper is used as the support. A type of chromatography in which the stationary phase is a sheet of special-grade filter paper. It is in all other aspects similar to thin-layer chromatography. Not a very sensitive method, but historically important as one of the first methods available for separating natural compounds. (07 Mar 2000) |
| gel exclusion chromatography | <investigation> A lab technique, a type of column chromatography, used to separate the components of a mixture by molecular size and to collect the molecules which are larger than a certain size. It is similar to gel filtration, small molecules are slowed or trapped by the pores in the gel beads filling the column, while large molecules, too large to fit into the pores, slide past the beads and get to the bottom of the column first. at this point, the large molecules are collected. Gel exclusion refers to the maximum size of molecule which will fit into the gel bead pores, and this lab technique is used to collect the molecules in the mixture which are larger than, or excluded from, the pores. (09 Oct 1997) |
| gel filtration chromatography | See: gel filtration. (05 Mar 2000) |
| partition chromatography | The separation of similar substances by repeated divisions between two immiscible liquids, so that the substances, in effect, cross the partition between the liquids in opposite directions; where one of the liquids is bound as a film on filter paper, the process is termed paper partition chromatography or paper chromatography. (05 Mar 2000) |
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