منابع مشابه
Vision in dim light: highlights and challenges.
On amoonless night or in the depths of the sea, where light levels aremany orders of magnitude dimmer than sunlight, animals rely on their visual systems to orient andnavigate, to find foodandmates and toavoidpredators. To seewell at such low light levels is far from trivial. The paucity of light means that visual signals generated in the light-sensitive photoreceptors of the retina can easily ...
متن کاملResponses of the phototransduction cascade to dim light.
The biochemistry of visual excitation is kinetically explored by measuring the activity of the cGMP phosphodiesterase (PDE) at light levels that activate only a few tens of rhodopsin molecules per rod. At 23 degrees C and in the presence of ATP, the pulse of PDE activity lasts 4 s (full width at half maximum). Complementing the rod outer segments (ROS) with rhodopsin kinase (RK) and arrestin or...
متن کاملExercise attenuates the metabolic effects of dim light at night.
Most organisms display circadian rhythms that coordinate complex physiological and behavioral processes to optimize energy acquisition, storage, and expenditure. Disruptions to the circadian system with environmental manipulations such as nighttime light exposure alter metabolic energy homeostasis. Exercise is known to strengthen circadian rhythms and to prevent weight gain. Therefore, we hypot...
متن کاملPhotic niche invasions: phylogenetic history of the dim-light
Supplementary data tml http://rspb.royalsocietypublishing.org/content/suppl/2011/07/21/rspb.2011.1355.DC1.h "Data Supplement" References ml#ref-list-1 http://rspb.royalsocietypublishing.org/content/early/2011/07/21/rspb.2011.1355.full.ht This article cites 62 articles, 22 of which can be accessed free P<P Published online 27 July 2011 in advance of the print journal. Subject collections (2833 a...
متن کاملEvolution of dim-light and color vision pigments.
A striking level of diversity of visual systems in different species reflects their adaptive responses to various light environments. To study the adaptive evolution of visual systems, we need to understand how visual pigments, the light-sensitive molecules, have tuned their wavelengths of light absorption. The molecular basis of spectral tuning in visual pigments, a central unsolved problem in...
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ژورنال
عنوان ژورنال: Iowa Journal of Literary Studies
سال: 1991
ISSN: 0743-2747,2325-8845
DOI: 10.17077/0743-2747.1364