| 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) |
|---|---|
| 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) |
| 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) |
| 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) |
| accommodation | <ophthalmology, physiology> Adjustment, especially that of the eye for various distances resulting in pupil constriction or dilatation. Origin: L. Accommodare = to fit to (18 Nov 1997) |
| accommodation, ocular | The dioptric adjustment of the eye (to attain maximal sharpness of retinal imagery for an object of regard) referring to the ability, to the mechanism, or to the process. It is the effecting of refractive changes by changes in the shape of the crystalline lens. Loosely, it refers to ocular adjustments for vision at various distances. (12 Dec 1998) |
| accommodation of eye | The increase in thickness and convexity of the eye's lens in order to focus the image of an external object upon the retina. (05 Mar 2000) |
| accommodation of nerve | <anatomy, nerve> The property of a nerve by which it adjusts to a slowly increasing strength of stimulus, so that its threshold of excitation is greater than it would be were the stimulus strength to have risen more rapidly. (05 Mar 2000) |
| accommodation reflex | Increased convexity of the lens, due to contraction of the ciliary muscle and relaxation of the suspensory ligament, to maintain a distinct retinal image. (05 Mar 2000) |
| accommodative convergence-accommodation ratio | The amount of convergence (measured in prism diopters of convergence) divided by the amount of accommodation (measured in diopters) required to direct both eyes upon an object. (05 Mar 2000) |
| amplitude of accommodation | The difference in refractivity of the eye at rest and when fully accommodated. (05 Mar 2000) |
| range of accommodation | The distance between an object viewed with minimal refractivity of the eye and one viewed with maximal accommodation. (05 Mar 2000) |
| relative accommodation | Quantity of accommodation required for single binocular vision for any specified distance, or for any particular degree of convergence. (05 Mar 2000) |