Long-Wavelength Reflecting Filters Found in the Larval Retinas of One Mantis Shrimp Family (Nannosquillidae).

Autor:	Feller KD; Physiology Development and Neuroscience Department, Physiological Laboratories, Downing Street, University of Cambridge, Cambridge CB2 3EG, UK; School of Biological Sciences, University of Bristol, Bristol BS8 1TQ, UK. Electronic address: kate.feller@gmail.com., Wilby D; School of Biological Sciences, University of Bristol, Bristol BS8 1TQ, UK., Jacucci G; Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK., Vignolini S; Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK., Mantell J; Wolfson Bioimaging Facility, University of Bristol, Bristol BS8 1TD, UK., Wardill TJ; Physiology Development and Neuroscience Department, Physiological Laboratories, Downing Street, University of Cambridge, Cambridge CB2 3EG, UK., Cronin TW; Department of Biological Sciences, 1000 Hilltop Circle, University of Maryland Baltimore County, Baltimore, MD 21250, USA., Roberts NW; School of Biological Sciences, University of Bristol, Bristol BS8 1TQ, UK.
Jazyk:	angličtina
Zdroj:	Current biology : CB [Curr Biol] 2019 Sep 23; Vol. 29 (18), pp. 3101-3108.e4. Date of Electronic Publication: 2019 Aug 29.
DOI:	10.1016/j.cub.2019.07.070
Abstrakt:	Both vertebrates and invertebrates commonly exploit photonic structures adjacent to their photoreceptors for visual benefits. For example, use of a reflecting structure (tapetum) behind the retina increases photon capture, enhancing vision in dim light [1-5]. Colored filters positioned lateral or distal to a photoreceptive unit may also be used to tune spectral sensitivity by selective transmission of wavelengths not absorbed or scattered by the filters [6-8]. Here we describe a new category of biological optical filter that acts simultaneously as both a transmissive spectral filter and narrowband reflector. Discovered in the larval eyes of only one family of mantis shrimp (stomatopod) crustaceans (Nannosquillidae), each crystalline structure bisects the photoreceptive rhabdom into two tiers and contains an ordered array of membrane-bound vesicles with sub-wavelength diameters of 153 ± 5 nm. Axial illumination of the intrarhabdomal structural reflector (ISR) in vivo produces a narrow band of yellow reflectance (mean peak reflectivity, 572 ± 18 nm). The ISR is similar to several synthetic devices, such as bandgap filters, laser mirrors, and (in particular) fiber Bragg gratings used in optical sensors for a wide range of industries. To our knowledge, the stomatopod larval ISR is the first example of a naturally occurring analog to these human-made devices. Considering what is known about these animals' visual ecology, we propose that these reflecting filters may help improve the detection of pelagic bioluminescence in shallow water at night. VIDEO ABSTRACT. (Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze:	MEDLINE
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