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[Light adaptation properties of receptor potentials of cyprinid retina]. 1991

L W Xu, and X L Yang
Shanghai Institute of Physiology, Chinese Academy of Sciences.

It was previously reported that changes in sensitivities of electroretinographic b-wave in the course of light adaptation depended on the intensity of background lights. B-wave sensitivity decreased with time by dimmer background lights, while it recovered during illumination with background lights of higher intensities. In this work we examined light adaptation properties of glutamate-isolated receptor potentials (P III components), using isolated and superfused cyprinid retinas. During dimmer background illumination, P III components were unchanged. When background lights were increased above certain levels, P III components showed partial recovery with time in the light. A detailed analysis of spectral sensitivities of P III components and their increment thresholds for several wavelengths indicated that the recovery of P III sensitivity appeared with background lights at which rod function was taken over by cone function. The results suggest that the recovery of b-wave sensitivity during brighter background illumination is partially a reflection of the adaptation property of cone photoreceptors.

UI MeSH Term Description Entries
D010786 Photoreceptor Cells Specialized cells that detect and transduce light. They are classified into two types based on their light reception structure, the ciliary photoreceptors and the rhabdomeric photoreceptors with MICROVILLI. Ciliary photoreceptor cells use OPSINS that activate a PHOSPHODIESTERASE phosphodiesterase cascade. Rhabdomeric photoreceptor cells use opsins that activate a PHOSPHOLIPASE C cascade. Ciliary Photoreceptor Cells,Ciliary Photoreceptors,Rhabdomeric Photoreceptor Cells,Rhabdomeric Photoreceptors,Cell, Ciliary Photoreceptor,Cell, Photoreceptor,Cell, Rhabdomeric Photoreceptor,Cells, Ciliary Photoreceptor,Cells, Photoreceptor,Cells, Rhabdomeric Photoreceptor,Ciliary Photoreceptor,Ciliary Photoreceptor Cell,Photoreceptor Cell,Photoreceptor Cell, Ciliary,Photoreceptor Cell, Rhabdomeric,Photoreceptor Cells, Ciliary,Photoreceptor Cells, Rhabdomeric,Photoreceptor, Ciliary,Photoreceptor, Rhabdomeric,Photoreceptors, Ciliary,Photoreceptors, Rhabdomeric,Rhabdomeric Photoreceptor,Rhabdomeric Photoreceptor Cell
D012160 Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent. Ora Serrata
D003530 Cyprinidae A family of freshwater fish comprising the minnows or CARPS. Barbels,Chub,Dace,Minnows,Roach (Fish),Shiner,Tench,Tinca,Barbus,Rutilus rutilus,Tinca tinca,Chubs,Shiners,Tinca tincas,tinca, Tinca
D004596 Electroretinography Recording of electric potentials in the retina after stimulation by light. Electroretinographies
D000221 Adaptation, Ocular The adjustment of the eye to variations in the intensity of light. Light adaptation is the adjustment of the eye when the light threshold is increased; DARK ADAPTATION when the light is greatly reduced. (From Cline et al., Dictionary of Visual Science, 4th ed) Light Adaptation,Adaptation, Light,Adaptations, Light,Adaptations, Ocular,Light Adaptations,Ocular Adaptation,Ocular Adaptations
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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