scholarly journals Red-shift of spectral sensitivity due to screening pigment migration in the eyes of a moth, Adoxophyes orana

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Aya Satoh ◽  
Finlay J. Stewart ◽  
Hisaharu Koshitaka ◽  
Hiroshi D. Akashi ◽  
Primož Pirih ◽  
...  
Keyword(s):  
Spectral Sensitivity ◽  
Red Shift ◽  
Adoxophyes Orana ◽  
Screening Pigment ◽  
Pigment Migration

Spectral sensitivity of screening pigment migration in the compound eye ofManduca sexta

1983 ◽  
Vol 153 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Richard H. White ◽  
Mark J. Banister ◽  
Ruth R. Bennett
Keyword(s):  
Spectral Sensitivity ◽  
Compound Eye ◽  
Screening Pigment ◽  
Pigment Migration

Spectral sensitivity of retinal screening pigment migration in the frog

1969 ◽  
Vol 9 (3) ◽  
pp. 377-IN8 ◽  
Author(s):  
P.A. Liebman ◽  
S. Carroll ◽  
A. Laties
Keyword(s):  
Spectral Sensitivity ◽  
Screening Pigment ◽  
Retinal Screening ◽  
Pigment Migration

scholarly journals The spectral sensitivity of Drosophila photoreceptors

2020 ◽  
Author(s):  
Camilla R. Sharkey ◽  
Jorge Blanco ◽  
Maya M. Leibowitz ◽  
Daniel Pinto-Benito ◽  
Trevor J. Wardill
Keyword(s):  
Drosophila Melanogaster ◽  
Spectral Sensitivity ◽  
Spectral Range ◽  
Visual Pigment ◽  
Colour Vision ◽  
Neural Processing ◽  
Cross Modulation ◽  
Screening Pigment ◽  
Peak Sensitivity

AbstractDrosophila melanogaster has long been a popular model insect species, due in large part to the availability of genetic tools and is fast becoming the model for insect colour vision. Key to understanding colour reception in Drosophila is in-depth knowledge of spectral inputs and downstream neural processing. While recent studies have sparked renewed interest in colour processing in Drosophila, photoreceptor spectral sensitivity measurements have yet to be carried out in vivo. We have fully characterised the spectral input to the motion and colour vision pathways, and directly measured the effects of spectral modulating factors, screening pigment density and carotenoid-based ocular pigments. All receptor sensitivities had significant shifts in spectral sensitivity compared to previous measurements. Notably, the spectral range of the Rh6 visual pigment is substantially broadened and its peak sensitivity is shifted by 92 nm from 508 to 600 nm. We propose that this deviation can be explained by transmission of long wavelengths through the red screening pigment and by the presence of the blue-absorbing filter in the R7y receptors. Further, we tested direct interactions between photoreceptors and found evidence of interactions between inner and outer receptors, in agreement with previous findings of cross-modulation between receptor outputs in the lamina.

Reversed Light Reaction of the Screening Pigment in a Compound Eye Induced by Noradrenaline

1987 ◽  
Vol 42 (7-8) ◽  
pp. 973-976 ◽  
Author(s):  
Achim Juse ◽  
Gunnar Höglund ◽  
Kurt Hamdorf
Keyword(s):  
Compound Eye ◽  
Local Application ◽  
Pigment Cells ◽  
Light Stimulation ◽  
Light Reaction ◽  
Transmission Microscopy ◽  
Normal Dispersion ◽  
Screening Pigment ◽  
Pigment Migration ◽  
Deilephila Elpenor

Migration of the screening pigment in the compound eye of the sphingid moth Deilephila elpenor is altered by noradrenaline, as shown by microreflectometric measurements on eyes of intact moths and by transmission microscopy on preparations consisting of the screening pigment cells and dioptric structures. Local application of noradrenaline inverts the reaction of the pigment to light stimulation; light causes a contraction of the pigment instead of the normal dispersion. It is suggested that catecholamines are involved in the normal regulation of pigment migration.

scholarly journals SCREENING-PIGMENT MIGRATION IN THE OCTOPUS RETINA INCLUDES CONTROL BY DOPAMINERGIC EFFERENTS

1993 ◽  
Vol 185 (1) ◽  
pp. 1-16
Author(s):  
I. G. Gleadall ◽  
K. Ohtsu ◽  
E. Gleadall ◽  
Y. Tsukahara
Keyword(s):  
Receptor Potential ◽  
Supporting Cells ◽  
Optic Nerves ◽  
Optic Lobes ◽  
Screening Pigment ◽  
Early Receptor Potential ◽  
Pigment Migration ◽  
Dramatic Difference ◽  
Series Of Experiments ◽  
Neurotransmitter Substances

The extent of screening-pigment (SP) migration in the intact octopus retina and the amplitude of the early receptor potential (ERP) correspond with the degree of adaptation to light or darkness. The light-adapted retina has SP granules concentrated in an apical layer, at the tips of the photoreceptor rhabdoms and supporting cells, and the ERP is barely detectable. In the fully dark-adapted retina, the SP granules are mostly at the base of the rhabdoms, and the ERP is at its maximum. Retinae at intermediate stages, between the fully dark- and light-adapted states, show corresponding intermediate stages of SP migration and ERP amplitude. A series of experiments demonstrates the effects on SP migration of the efferent nerves, which form a subset of fibres in the optic nerves. When the optic nerves to one half of the retina have been severed, there is a dramatic difference in the distribution of SP in areas of the retina (of the dark-adapted eye) connected with severed or intact nerves: apical versus basal, respectively. On incubation of a light- adapted retina with 5 micromolar dopamine, but not with other catecholamines or other putative neurotransmitter substances, SP migrates basally and the ERP is significantly larger than for controls. In octopuses treated with reserpine, SP stays in an apical location and the ERP remains very small, regardless of the state of adaptation and of whether the optic nerves are intact. It is concluded that dopaminergic efferents from the optic lobes effect dark-adaptational SP migration in the cephalopod retina. The arrival in the retina of efferent signals that effect adaptational changes through the mediation of dopamine is a remarkable analogue of the vertebrate system.

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