Evidence for a sensitizing pigment in the ocellar photoreceptors of the fly (Musca, Calliphora)

1988 ◽  
Vol 163 (4) ◽  
pp. 421-423 ◽  
Author(s):  
K. Kirschfeld ◽  
R. Feiler ◽  
K. Vogt
Keyword(s):  
Sensitizing Pigment

Sensitizing pigment in the fly

1983 ◽  
Vol 9 (4) ◽  
pp. 319-328 ◽  
Author(s):  
K. Vogt ◽  
K. Kirschfeld
Keyword(s):  
Sensitizing Pigment

The sensitizing pigment in fly photoreceptors

1983 ◽  
Vol 10 (1-2) ◽  
pp. 81-92 ◽  
Author(s):  
K. Kirschfeld ◽  
R. Feiler ◽  
R. Hardie ◽  
K. Vogt ◽  
N. Franceschini
Keyword(s):  
Sensitizing Pigment

Ultra-violet sensitizing pigment in blowfly photoreceptors R1-6; probable nature and binding sites

1992 ◽  
Vol 171 (5) ◽  
Author(s):  
Kurt Hamdorf ◽  
Peter Hochstrate ◽  
Gunnar H�glund ◽  
Marion Moser ◽  
Sabine Sperber ◽  
...  
Keyword(s):  
Binding Sites ◽  
Ultra Violet ◽  
Probable Nature ◽  
Sensitizing Pigment

scholarly journals The contribution of a sensitizing pigment to the photosensitivity spectra of fly rhodopsin and metarhodopsin.

1979 ◽  
Vol 73 (5) ◽  
pp. 517-540 ◽  
Author(s):  
B Minke ◽  
K Kirschfeld
Keyword(s):  
Spectral Range ◽  
Visual Pigment ◽  
Compound Eye ◽  
Electrical Potential ◽  
High Sensitivity ◽  
Wavelength Dependence ◽  
Difference Spectrum ◽  
Visible Spectral Range ◽  
Photosensitivity Spectrum ◽  
Sensitizing Pigment

Most of the photoreceptors of the fly compound eye have high sensitivity in the ultraviolet (UV) as well as in the visible spectral range. This UV sensitivity arises from a photostable pigment that acts as a sensitizer for rhodopsin. Because the sensitizing pigment cannot be bleached, the classical determination of the photosensitivity spectrum from measurements of the difference spectrum of the pigment cannot be applied. We therefore used a new method to determine the photosensitivity spectra of rhodopsin and metarhodopsin in the UV spectral range. The method is based on the fact that the invertebrate visual pigment is a bistable one, in which rhodopsin and metarhodopsin are photointerconvertible. The pigment changes were measured by a fast electrical potential, called the M potential, which arises from activation of metarhodopsin. We first established the use of the M potential as a reliable measure of the visual pigment changes in the fly. We then calculated the photosensitivity spectrum of rhodopsin and metarhodopsin by using two kinds of experimentally measured spectra: the relaxation and the photoequilibrium spectra. The relaxation spectrum represents the wavelength dependence of the rate of approach of the pigment molecules to photoequilibrium. This spectrum is the weighted sum of the photosensitivity spectra of rhodopsin and metarhodopsin. The photoequilibrium spectrum measures the fraction of metarhodopsin (or rhodopsin) in photoequilibrium which is reached in the steady state for application of various wavelengths of light. By using this method we found that, although the photosensitivity spectra of rhodopsin and metarhodopsin are very different in the visible, they show strict coincidence in the UV region. This observation indicates that the photostable pigment acts as a sensitizer for both rhodopsin as well as metarhodopsin.

scholarly journals The Fly Sensitizing Pigment Enhances UV Spectral Sensitivity While Preventing Polarization-Induced Artifacts

2018 ◽  
Vol 12 ◽  
Author(s):  
Marko Ilić ◽  
Andrej Meglič ◽  
Marko Kreft ◽  
Gregor Belušič
Keyword(s):  
Spectral Sensitivity ◽  
Sensitizing Pigment
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