| Vollmer test | A tuberculin patch test. (05 Mar 2000) |
|---|---|
| Vollmer, Herman | <person> U.S. Paediatrician, 1896-1959. See: Vollmer test. (05 Mar 2000) |
| vollumescope | <instrument, physics> An instrument consisting essentially of a glass tube provided with a graduated scale, for exhibiting to the eye the changes of volume of a gas or gaseous mixture resulting from chemical action, and the like. Origin: Volume + -scope. Source: Websters Dictionary (01 Mar 1998) |
| vollumeter | <physics> An instrument for measuring the volumes of gases or liquids by introducing them into a vessel of known capacity. Origin: Cf. F. Volumetre. See Volumetric. Source: Websters Dictionary (01 Mar 1998) |
| Volpe, Anthony | <person> U.S. Dentist, *1932. See: Volpe-Manhold Index. (05 Mar 2000) |
| Volpe-Manhold Index | An index for comparing the amount of dental calculus in individuals. (05 Mar 2000) |
| volsella | Synonym: vulsella forceps. Origin: see vulsella (05 Mar 2000) |
| volt | <unit> Unit of electrical potential. (11 Jan 1998) |
| volta-electric | Of or pertaining to voltaic electricity, or voltaism. Source: Websters Dictionary (01 Mar 1998) |
| volta-electrometer | An instrument for the exact measurement of electric currents. Source: Websters Dictionary (01 Mar 1998) |
| voltage | <physics> Electric potential or potential difference, expressed in volts. Source: Websters Dictionary (01 Mar 1998) |
| voltage clamp | <physiology, technique> A technique in electrophysiology, in which a microelectrode is inserted into a cell and current injected through the electrode so as to hold the cells membrane potential at some predefined level. The technique can be used with separate electrodes for voltage sensing and current passing, for small cells, the same electrode can be used for both. Voltage clamp is a powerful technique for the study of ion channels. See: patch clamp. (18 Nov 1997) |
| voltage gated ion channel | <physiology> A transmembrane ion channel whose permeability to ions is extremely sensitive to the transmembrane potential difference. These channels are essential for neuronal signal transmission and for intracellular signal transduction. See: sodium channel. (18 Nov 1997) |
| voltage gradient | <physiology> Literally, the electric field in a region, defined as the potential difference between two points divided by the distance between them. Used more loosely, the potential difference across a plasma membrane. (18 Nov 1997) |
| voltage loop | <radiobiology> A wire which encircles the main axis of a tokamak in the vicinity of the vacuum vessel. The voltage induced in this loop during the shot is a measure of the ohmic heating voltage induced by transformer action and applied to the plasma. (09 Oct 1997) |