| jet lag | An imbalance of the normal circadian rhythm resulting from subsonic or supersonic travel through a varied number of time zones and leading to fatigue, irritability, and various functional disturbances. (05 Mar 2000) |
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| anaphase lag | Slowing or arrest in the normal migration of chromosomes during anaphase, resulting in such chromosomes being excluded from one of the daughter cells. (05 Mar 2000) |
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| homeostatic lag | The interval in a homeostatic process between a change of the trait controlled and the appropriate response, due to afferent, efferent, and central components. The lag may be a pure random variable, e.g., the waiting time of an exponential process or the sum of several such processes taking any value greater than zero but with a mean considerably greater than zero; sometimes it may be deterministic or almost so and with a minimum sharply defined and greater than zero for anatomical reasons. For instance, the partial pressures of oxygen and carbon dioxide are controlled in the lungs but based on afferent information obtained from the carotid body that is already dated because of the circulation time of ten seconds or so between the two sites. (05 Mar 2000) |
| nitrogen lag | The length of time after the ingestion of a given protein before the amount of nitrogen equal to that in the protein has been excreted in the urine. (05 Mar 2000) |
| lag | 1. One who lags; that which comes in last. "The lag of all the flock." 2. The fag-end; the rump; hence, the lowest class. "The common lag of people." (Shak) 3. The amount of retardation of anything, as of a valve in a steam engine, in opening or closing. 4. A stave of a cask, drum, etc. <machinery> Especially, one of the narrow boards or staves forming the covering of a cylindrical object, as a boiler, or the cylinder of a carding machine or a steam engine. 5. <zoology> See Graylag. Lag of the tide, the interval by which the time of high water falls behind the mean time, in the first and third quarters of the moon; opposed to priming of the tide, or the acceleration of the time of high water, in the second and fourth quarters; depending on the relative positions of the sun and moon. Lag screw, an iron bolt with a square head, a sharp-edged thread, and a sharp point, adapted for screwing into wood; a screw for fastening lags. Source: Websters Dictionary (01 Mar 1998) |
| lag phase | <cell culture> The initial growth phase of a culture, during which cell number remains relatively constant prior to rapid growth. (09 Oct 1997) |
| high-frequency jet ventilation | Respiratory support system used primarily with rates of about 100 to 200/min with volumes of from about one to three times predicted anatomic dead space. Used to treat respiratory failure and maintain ventilation under severe circumstances. (12 Dec 1998) |
| injections, jet | The injection of solutions into the skin by compressed air devices so that only the solution pierces the skin. (12 Dec 1998) |
| jet | <chemical> A variety of lignite, of a very compact texture and velvet black colour, susceptible of a good polish, and often wrought into mourning jewelry, toys, buttons, etc. Formerly called also black amber. <zoology> Jet ant, a blackish European ant (Formica fuliginosa), which builds its nest of a paperlike material in the trunks of trees. Origin: OF. Jet, jayet, F. Jaiet, jais, L. Gagates, fr. Gr.; so called from or, a town and river in Lycia Alternative forms: jeat, jayet. Source: Websters Dictionary (01 Mar 1998) |
| jet ejector pump | A suction pump in which fluid under high pressure is forced through a nozzle into an abruptly larger tube where a high velocity jet, at a low pressure in accordance with Bernoulli's law, entrains gas or liquid from a side tube opening just beyond the end of the nozzle to create suction; e.g., the pump by which steam is used to evacuate an autoclave, a water aspirator. (05 Mar 2000) |
| jet injection | Hypodermic injection of drugs by a jet injector. (05 Mar 2000) |
| jet injector | An injector that uses high pressure to force a liquid through a small orifice at a velocity sufficient to penetrate skin or mucous membrane without the use of a needle. (05 Mar 2000) |
| jet nebuliser | An atomiser that uses an air or gas stream to change a liquid into small particles. (05 Mar 2000) |