| roll tube | A modification of the plate culture; a seeded medium containing agar is placed in a test tube which is rolled or spun horizontally until the medium solidifies evenly on the interior of the tube. (05 Mar 2000) |
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| roll-tube culture | A culture in a tube of medium which has been melted and allowed to solidify while the tube is being spun; the inside of the tube is thereby coated with a thin layer of solidified medium. (05 Mar 2000) |
| pharyngeal opening of auditory tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| pharyngeal opening of eustachian tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| pharyngotympanic tube | A tube leading from the tympanic cavity to the nasopharynx; it consists of an osseous (posterolateral) portion at the tympanic end, and a fibrocartilaginous (anteromedial) portion at the pharyngeal end; where the two portions join, in the region of the sphenopetrosal fissure, is the narrowest portion of the tube (isthmus); the auditory tube enables equalization of pressure within the tympanic cavity with ambient air pressure, referred to commonly as "popping of the ears". Synonym: tuba auditiva, tuba auditoria, eustachian tube, guttural duct, otopharyngeal tube, otosalpinx, pharyngotympanic tube, salpinx, tuba acustica, tuba eustachiana, tuba eustachii. (05 Mar 2000) |
| rotating anode tube | A modern X-ray tube, in which heat buildup is distributed through a larger volume by rotating the target. (05 Mar 2000) |
| Ruysch's tube | A minute tubular cavity opening in the lower and anterior portion of each surface of the nasal septum; best seen in the early foetal period when it is associated with the vomeronasal organ (Jacobson's organ). (05 Mar 2000) |
| Ryle's tube | A thin rubber tube, with about the lumen of a no. 8 catheter, and an olive-tipped extremity, used in the giving of a test meal. (05 Mar 2000) |
| Miller-Abbott tube | A tube with two lumens, one ending in a small collapsible balloon and the other in a metallic tip with numerous perforations; used for intestinal decompression. Synonym: Abbott's tube. (05 Mar 2000) |
| photomultiplier tube | A detector which amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3 to 4 electrons are liberated and accelerated to the subsequent dynode. (05 Mar 2000) |
| Wangensteen tube | A modified siphon that maintains constant negative pressure, used with a duodenal tube for the relief of gastric and intestinal distention. Synonym: Wangensteen tube. (05 Mar 2000) |
| molybdenum target tube | An X-ray tube with an anode surface made of molybdenum instead of tungsten, used in mammography. (05 Mar 2000) |
| water tube | <zoology> One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. Source: Websters Dictionary (01 Mar 1998) |
| pitot's tube | <physics> A bent tube used to determine the velocity of running water, by placing the curved end under water, and observing the height to which the fluid rises in the tube; a kind of current meter. Source: Websters Dictionary (01 Mar 1998) |
| Pitot tube | A stationary L-shaped tube inserted in a fluid stream, with its opening upstream, and used for measuring the velocity of fluid movement at that point in terms of the pressure developed in the tube by the fluid impinging on it, compared to a second tube opening laterally or downstream. (05 Mar 2000) |