light adaptation

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adaptation

 [ad″ap-ta´shun]
1. a dynamic, ongoing, life-sustaining process by which living organisms adjust to environmental changes.
2. adjustment of the pupil to light.
biological adaptation the adaptation of living things to environmental factors for the ultimate purpose of survival, reproduction, and an optimal level of functioning.
color adaptation
1. changes in visual perception of color with prolonged stimulation.
2. adjustment of vision to degree of brightness or color tone of illumination.
dark adaptation adaptation of the eye to vision in the dark or in reduced illumination.
light adaptation adaptation of the eye to vision in the sunlight or in bright illumination (photopia), with reduction in the concentration of the photosensitive pigments of the eye.
physiological adaptation the ongoing process by which internal body functions are regulated and adjusted to maintain homeostasis in the internal environment.
psychological adaptation the ongoing process, anchored in the emotions and intellect, by which humans sustain a balance in their mental and emotional states of being and in their interactions with their social and cultural environments.
social adaptation adjustment and adaptation of humans to other individuals and community groups working together for a common purpose.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

light ad·ap·ta·tion

the visual adjustment occurring under increased illumination in which the retinal sensitivity to light is reduced.
See also: light-adapted eye, Purkinje shift.
Synonym(s): photopic adaptation
Farlex Partner Medical Dictionary © Farlex 2012

light adaptation

n.
The process, chiefly involving constriction of the pupil, by which the eye adapts to an increase in illumination.

light′-a·dapt′ed (-ə-dăp′tĭd) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

light ad·ap·ta·tion

(līt ad'ap-tā'shŭn)
The visual adjustment occurring under increased illumination in which the retinal sensitivity to light is reduced.
See also: light-adapted eye
Synonym(s): photopic adaptation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
We observed significantly higher F0 in dark-adapted leaves and F0' in light-adapted leaves after malate treatment compared with control plants (Fig.
Contrary to the maximal and effective PSII quantum yield ([F.sub.v]/[F.sub.m] and [DELTA]F/[F.sub.m]' respectively), the quantification of non-photochemical quenching (NPQ) requires parameters measured at different stages of an experiment ([F.sub.m] and [F.sub.m]' maximal fluorescence emitted by a dark-adapted or light-adapted sample).
[DELTA]F/[F.sub.m]' provides an estimate of the effective quantum efficiency of PSII photochemistry in the light-adapted state.
Each light-adapted turtle was placed in the start area of the Y-maze and immediately exposed to a circular colored-light stimulus projected on the end of one maze arm.
Training was done each day when the turtles were fully light-adapted, and lasted between 2 and 3 h.
Light-adapted daytime and dark-adapted night fluorescence characteristics were analyzed separately for each species, and effects of season and pool were tested using a factorial two-way ANOVA.
Light-adapted copepods exhibit similar escape responses when exposed to rapid decreases in light intensity (Buskey et at., 1986, 1987).
similis bioluminescence would occur at higher illumination levels because of the apparent need for the eyes to be light-adapted for the initiation of luminescent countershading (Latz and Case, 1992).
All of the recordings reported here were from light-adapted photoreceptors continuously bathed in bright white light.
In addition, the cross-reaction is stronger in dark-adapted animals than in light-adapted animals.
(1990) on the galatheid Petrolisthes elongatus and by Gaten (1994) on Munida rugosa lent further support to this notion, but specified that this was true only for the dark-adapted eye; in the light-adapted state apposition optics were used.
In eight experimental pairs, the specific activity of the protein from light-adapted animals (915 [+ or -] 304 cpm/[mu]g protein: average value with SD) was significantly higher (P [is less than or equal to] 0.02; t-test for unpaired data) than that of squid kept in the dark environment (542 [+ or -] 190 cpm/mg protein).