visual pigment


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visual pigment

A light-absorbing compound in the photoreceptor cells of the retina that converts light energy into a nerve impulse that is passed from the receptor cells to the optic nerve.
See also: pigment
References in periodicals archive ?
Biochemistry of visual pigment regeneration: The Friedenwald lecture.
LpOps5 is clearly a functional visual pigment that is present at a sufficiently high concentration in rhabdoms to impact the photoresponse.
The molecular mechanism that differentiates wavelengths related to color perception in the visual system depends on the presence of specific proteins that form the visual pigments (Trezise & Collin, 2005).
But researchers at the Max Planck Institute for Brain Research in Frankfurt/M., together with colleagues at the University of Frankfurt and universities in Vienna, have now been able to show that in mature cones of mice and rats the production of visual pigment is regulated by thyroid hormone.
It is possible that phosphenes are caused by electrical charge in the neural network of the retina and the breakdown and regeneration of visual pigment, although the retina is not directly stimulated by light at this time.
"It looks like the circadian photoreceptor is not going to be a known visual pigment," says Kay.
The visual pigment is found in the outer segments of the photoreceptors.
Cronin and Jinks (2001) reviewed structural and spectral aspects of crustacean visual ontogeny and predicted the presence of two receptor classes in some crustacean larvae despite the fact that microspectrophotometry has found only a single visual pigment. Adult P.
Szuts was looking for a visual pigment known as rhodopsin, which is the light-sensing molecule in all known types of eyes.