| SDT | sensory detection theory; right sacrotransverse [fetal position] [Lat. sacrodextra transversa]; sign... |
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| DOI | date of injury; died of injuries; diffusion of innovations [theory] |
| MAUT | multi-attribute utility theory |
| theor | theory, theoretical |
| TSD | target-skin distance; Tay-Sachs disease; theory of signal detectability |
| CASI | Cognitive Abilities Screening Instrument |
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| PBI | Parental Bonding Instrument |
| RAI | Resident Assessment Instrument |
| DFT | Density Functional Theory |
| IRT | Item Response Theory |
| stringed instrument theory | A no longer tenable theory stating that in human voice production the vocal cords function in a manner similar to the strings in a stringed musical instrument. (05 Mar 2000) |
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| reed instrument theory | A no longer tenable theory stating that in human voice production the larynx functions in a manner similar to a reed musical instrument. (05 Mar 2000) |
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| plugging instrument | A dental instrument used for condensing gold (foil), amalgam, or any plastic material in a cavity, and which is operated by hand or by mechanical means. Synonym: packer, plugging instrument. (05 Mar 2000) |
| Sabouraud-Noire instrument | An obsolete device for measuring the quantity of X-rays by means of the change in colour of a disk of barium platinocyanide which exposure to them produces; the unit used in this method is called tint B = erythema dose. (05 Mar 2000) |
| purse-string instrument | An intestinal clamp with jaws at an angle to the handle; when closed across the bowel, large grooved interdigitating serrations allow passage of a straight needle and suture through each side to form a purse-string suture, after which the clamp is removed. (05 Mar 2000) |
| stereotactic instrument | Stereotaxic instrument, an apparatus attached to the head, used to localise precisely an area in the brain by means of coordinates related to intracerebral structures. (05 Mar 2000) |
| instrument | A tool or implement. Origin: L. Instrumentum (05 Mar 2000) |
| test handle instrument | A root canal instrument the handle of which is similar to a collet chuck and which can be secured in position on the root canal instrument to adjust its effective length. (05 Mar 2000) |
| Krueger instrument stop | A mechanical device limiting the insertion of a root canal instrument into a canal. (05 Mar 2000) |
| Abbe theory of image formation | <optics, physics> Abbe's theory is based on the fact that a non-self-luminous particle, which is illuminated by an extraneous source, gives rise to diffracted light rays, in addition to the dioptric pencil. He stated that to form a good microscopical image as many of the diffracted rays as possible should be intercepted by the objective. With closely ruled lines, his theory is easily demonstrated by observing the back lens of the objective, for here the diffracted rays can be observed directly if the aperture diaphragm is closed. It can be shown that, when the illumination is arranged to exclude the diffracted images, resolution is lost. (11 Mar 1998) |
| adsorption theory of narcosis | That a drug becomes concentrated at the surface of the cell as a result of adsorption, and thus alters permeability and metabolism. (05 Mar 2000) |
| Altmann's theory | A theory that protoplasm consists of granular particles (called bioblasts) that are clustered and enclosed in indifferent matter. (05 Mar 2000) |
| Arrhenius-Madsen theory | That the reaction of an antigen with its antibody is a reversible reaction, the equilibrium being determined according to the law of mass action by the concentrations of the reacting substances. (05 Mar 2000) |
| atomic theory | That chemical compounds are formed by the union of atoms in certain definite proportions; in its modern form, first advanced in 1803 by John Dalton. (05 Mar 2000) |
| Baeyer's theory | That carbon bonds are set at fixed angles (109 |
| balance theory | In social psychology, a theory which assumes that steady and unsteady states can be specified for cognitive units, such as an individual and his or her attitudes or acts, and that such units tend to seek steady states (balance); e.g., balance exists when both parts of a unit are evaluated the same, but disequilibrium arises when both parts are not evaluated the same, which causes either cognitive reevaluation of the parts or their segregation. See: cognitive dissonance theory, consistency principle. (05 Mar 2000) |
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