منابع مشابه
Bleached pigment activates transduction in salamander cones
We have used suction electrode recording together with rapid steps into 0.5 mM IBMX solution to investigate changes in guanylyl cyclase velocity produced by pigment bleaching in isolated cones of the salamander Ambystoma tigrinum. Both backgrounds and bleaches accelerate the time course of current increase during steps into IBMX. We interpret this as evidence that the velocity of the guanylyl c...
متن کاملIsolation of the middle- and long-wavelength-sensitive cones in normal trichromats.
Spectral sensitivity in the red-green spectral range typically reflects the joint influence of the middle-wavelength-sensitive cones (the M or green cones) and long-wavelength-sensitive cones (the L or red cones). The balance of M- and L-cone influence can be altered by presenting the test lights superimposed upon steady background fields of long or short wavelength. We find that presenting tes...
متن کاملParalogous origin of the red- and green-sensitive visual pigment genes in vertebrates.
The nucleotide sequence of the red-sensitive visual pigment gene, R007Af, in the fish Astyanax fasciatus, from the initiation codon to the stop codon of this gene, including introns, is 1,592 bp, making it the shortest visual pigment gene known in vertebrates. Analysis of this and other homologous sequence data suggests that vertebrates initially had two duplicate genes and that each ancestor o...
متن کاملTurning Cones Off: the Role of the 9-Methyl Group of Retinal in Red Cones
Our ability to see in bright light depends critically on the rapid rate at which cone photoreceptors detect and adapt to changes in illumination. This is achieved, in part, by their rapid response termination. In this study, we investigate the hypothesis that this rapid termination of the response in red cones is dependent on interactions between the 9-methyl group of retinal and red cone opsin...
متن کاملCrystal Phase Study of Pigment Red 254 in the Presence of Ionic Liquids
Different crystal phase with a same chemical structure, polymorphous, is a specific physical characteristic which determine the end usage of pigments especially in high performance ones. Diketopyrrolopyrrole DPP derivatives, as one of the innovative in heterocyclic pigments, follow this pattern. Synthesis of pigment red 254 in selected crystal phase using ionic liquids was achieved without any ...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1965
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1965.sp007535