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  The pigment system of the photoreceptor 7 yellow in the fly, a complex photoreceptor

Kirschfeld, K., Hardie, R., Lenz, G., & Vogt, K. (1988). The pigment system of the photoreceptor 7 yellow in the fly, a complex photoreceptor. Journal of Comparative Physiology A, 162(4), 421-433. doi:10.1007/BF00612508.

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Kirschfeld, K1, 2, Author              
Hardie, R1, 2, Author              
Lenz, G1, 2, Author              
Vogt, K1, 2, Author              
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1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: The 7y photoreceptor in the fly (Musca, Calliphora) retina harbours an unusually complex pigment system consisting of a bistable visual pigment (xanthopsin, X and metaxanthopsin, M), a blue-absorbing C40-carotenoid (zeaxanthin and/or lutein) and a uv sensitizing pigment (3-OH retinol). The difference spectrum and photoequilibrium spectrum in single 7y rhabdomeres were determined microspectrophotometrically (Fig. 2). The extinction spectrum of the C40-carotenoid has a pronounced vibrational structure, with peaks at 430, 450 and 480 nm (Fig. 3). The off-axis spectral sensitivity, determined electrophysiologically with 1 nm resolution shows no trace of this fine structure thus excluding the possibility that the C40-carotenoid is a second sensitizing pigment (Fig. 4). The absorption spectra of X and M are derived by fitting nomogram spectra (based on fly R1–6 xanthopsin) to the difference spectrum.λ max for X is 425 nm, and for M 510 nm (Fig. 5). It is shown that the photoequilibrium spectrum and the difference spectrum can be used to derive the relative photosensitivity spectra of X and M using the analytical method developed by Stavenga (1975). The result (Fig. 6) shows a pronounced uv sensitivity for both, X and M, indicating that the uv sensitizing pigment transfers energy to both X and M. A value of 0.7 forΦ, the relative efficiency of photoconversion for X and M, is obtained by fitting the analytically derived relative photosensitivity spectra to the absorption spectra at wavelengths beyond 420 nm.

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 Dates: 1988-07
 Publication Status: Published in print
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 Identifiers: DOI: 10.1007/BF00612508
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Title: Journal of Comparative Physiology A
  Other : J. Comp. Physiol. A -Neuroethol. Sens. Neural Behav. Physiol.
Source Genre: Journal
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Publ. Info: Heidelberg : Springer Verlag
Pages: - Volume / Issue: 162 (4) Sequence Number: - Start / End Page: 421 - 433 Identifier: ISSN: 0340-7594
CoNE: https://pure.mpg.de/cone/journals/resource/954925519626