| time marker | An instrument that marks the time, usually in seconds or fractions of seconds, on a kymograph record in physiologic experiments. (05 Mar 2000) |
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| time of flight | The time for a photon created by annihilation of a positron-electron pair to reach a detector; since annihilation photons are created in pairs and travel in opposite directions at about 3 × 1010 cm/sec, measurement of the difference in arrival time at detectors with sub-nanosecond resolution allows calculation of the location of the event; the basic physics of positron emission tomography. (05 Mar 2000) |
| time perception | The ability to estimate periods of time lapsed or duration of time. (12 Dec 1998) |
| time sense | The faculty by which the passage of time is appreciated. (05 Mar 2000) |
| time-compensated gain | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| time-gain compensation | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| time-lapse microscopy | Microscopy in which the same object (e.g., a cell) is photographed at regular time intervals over several hours. (05 Mar 2000) |
| time-varied gain | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| time-varied gain control | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| timeless | <molecular biology> Drosophila gene essential for the production of circadian rhythms. The protein product, TIM, may be necessary for the accumulation of the PER protein, the product of the per gene. TIM and PER associate with one another and the regulated interaction seems to determine the entry of PER into the nucleus: both TIM and PER are produced in a circadian cycle. (28 May 1998) |
| TIMI | Acronym for thrombolysis in myocardial infarction; a large multicenter controlled clinical trial. (05 Mar 2000) |
| timid | Wanting courage to meet danger; easily frightened; timorous; not bold; fearful; shy. "Poor is the triumph o'er the timid hare." (Thomson) Synonym: Fearful, timorous, afraid, cowardly, pusillanimous, faint-hearted, shrinking, retiring. Tim"idly, Tim"idness. Origin: L. Timidus, fr. Timere to fear; cf. Skr. Tam to become breathless, to become stupefief: cf. F. Timide. Source: Websters Dictionary (01 Mar 1998) |
| timnodonic acid | A 20-carbon fatty acid with five cis double bonds located on carbons 5, 8, 11, 14, and 17; an important component of fish oils; a precursor to the 3-series prostaglandins e.g., PGE3. (05 Mar 2000) |
| timolol | <chemical> A beta-adrenergic antagonist similar in action to propranolol. The levo-isomer is the more active. Timolol has been proposed as an antihypertensive, antiarrhythmic, antiangina, and antiglaucoma agent. It is also used in the treatment of migraine and tremor. Pharmacological action: adrenergic beta-antagonists, anti-arrhythmia agents, antihypertensive agents, sympatholytics. Chemical name: 2-Propanol, 1-((1,1-dimethylethyl)amino)-3-((4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl)oxy)-, (S)- (12 Dec 1998) |
| timolol maleate | (-)-1-(tert-Butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate;a beta-adrenergic blocking agent used in the treatment of hypertension and used in eyedrops in the treatment of chronic open-angle glaucoma. (05 Mar 2000) |