| displacement threshold | The least distinguishable break in the contour of a line. (05 Mar 2000) |
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| affect displacement | A shift of feeling from the object originally arousing it to some associated object. (05 Mar 2000) |
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| vertical displacement event | Disruption which occurs because plasma is not adequately stabilised against vertical motions. (09 Oct 1997) |
| mesial displacement | Malposition of a tooth mesial to normal, in an anterior direction following the curvature of the dental arch. Synonym: mesial displacement, mesioplacement. (05 Mar 2000) |
| displacement | 1. The act of displacing, or the state of being displaced; a putting out of place. The quantity of anything, as water, displaced by a floating body, as by a ship, the weight of the displaced liquid being equal to that of the displacing body. 2. <psychology> The process by which an emotional or behavioural response that is appropriate for one situation appears in another situation for which it is inappropriate. 3. <chemistry> The process of extracting soluble substances from organic material and the like, whereby a quantity of saturated solvent is displaced, or removed, for another quantity of the solvent. 4. <mechanics> Piston displacement, the volume of the space swept through, or weight of steam, water, etc, displaced, in a given time, by the piston of a steam engine or pump. Origin: Cf. F. Deplacement. Source: Websters Dictionary (03 Jul 1999) |
| displacement analysis | General term for an assay in which a binder competes for labelled versus unlabelled ligand; following separation of free and bound ligand, the ligand (the analyte assayed) is quantitated by relating bound and unbound ratios to known standards. See: enzyme-linked immunosorbent assay, radioreceptor assay, immunoassay, enzyme-multiplied immunoassay technique, radioimmunoassay. Synonym: displacement analysis, saturation analysis. (05 Mar 2000) |
| displacement loop | <molecular biology> A structure that can sometimes be seen on DNA which forms when a small area of the double-stranded molecule comes apart and becomes two single strands. The result is a structure shaped like the letter D. Single-stranded binding proteins are usually present to hold the strands apart for the purpose of DNA replication. (09 Oct 1997) |
| double displacement mechanism | A special multisubstrate reaction in which, for a two-substrate, two-product (i.e., bi-bi) system, an enzyme reacts with one substrate to form a product and a modified enzyme, the latter then reacting with a second substrate to form a second, final product, and regenerating the original enzyme. An example of such a mechanism is found in the aminotransferases. More complex ping-pong mechanisms exist for enzymes having more than two substrates. Synonym: double displacement mechanism. (05 Mar 2000) |
| intervertebral disk displacement | An intervertebral disk in which the nucleus pulposus has protruded through surrounding fibrocartilage. This occurs most frequently in the lower lumbar region. (12 Dec 1998) |
| tissue displacement | The change in the form or position of tissues as a result of pressure. (05 Mar 2000) |
| absolute intensity threshold acuity | The minimal light that can be seen. (05 Mar 2000) |
| absolute threshold | The lowest limit of any perception whatever. Compare: differential threshold. Synonym: stimulus threshold. (05 Mar 2000) |
| achromatic threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| anaerobic threshold | The oxygen consumption level above which aerobic energy production is supplemented by anaerobic mechanisms during exercise, resulting in a sustained increase in lactate concentration and metabolic acidosis. The anaerobic threshold is affected by factors that modify oxygen delivery to the tissues; it is low in patients with heart disease. Methods of measurement include direct measure of lactate concentration, direct measurement of bicarbonate concentration, and gas exchange measurements. (12 Dec 1998) |
| auditory threshold | The audibility limit of discriminating sound intensity and pitch. (12 Dec 1998) |
| brightness difference threshold | The smallest difference that can be perceived as a difference in brightness. Synonym: light difference. (05 Mar 2000) |