The pigment in the rod cells of the retina of the eye, also known as visual purple, consisting of the protein opsin and retinaldehyde, which is responsible for the visual process. In cone cells of the retina the equivalent protein is iodopsin.
A light-sensitive substance found in the rods.
A light-sensitive purple pigment in the rods of the retina, which makes it possible to see in dim light.
The visual pigment in the red cells of the eye. Consists of the protein opsin and 11-cis retinal. When light enters the eye, the 11-cis retinal changes to 11-trans retinal, which then separates from opsin. Recombination is then needed to restore the rhodopsin. This combination requires more retinol (which is changed to retinal) and the niacin-containing coenzyme NAD.
Purple pigment within the rods of the retina, essential for vision in dim light.
Red pigment of the rods which is bleached by daylight.
A pigment in the retina of the eye, within the rods, consisting of retinal (an aldehyde of vitamin A) and a protein. The presence of rhodopsin is essential for vision in dim light. It is bleached in the presence of light and this stimulates nervous activity in the rods.
The glycoprotein opsin of the rods of the retina; combines with retinal to form a functional photopigment responsive to light. Formerly called visual purple.
A light-sensitive, reddish-purple pigment found in the retinal rods of the eye. It becomes bleached when exposed to yellow light and plays a role in the retina’s interpretation of visual stimuli. This pigment is also known as visual purple.