Item talk:Q237283

From geokb

{

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Visual pigments, oil droplets, lens, and cornea characterization in the whooping crane (Grus americana)",
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       "value": "10.1242/jeb.108456",
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     "name": "Journal of Experimental Biology",
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     "issueNumber": "21"
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   "datePublished": "2014",
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   "abstract": "Vision has been investigated in many species of birds, but few studies have considered the visual systems of large birds and the particular implications of large eyes and long-life spans on visual system capabilities. To address these issues we investigated the visual system of the whooping crane\u00a0Grus americana\u00a0(Gruiformes, Gruidae), which is one of only two North American crane species. It is a large, long-lived bird in which UV sensitivity might be reduced by chromatic aberration and entrance of UV radiation into the eye could be detrimental to retinal tissues. To investigate the whooping crane visual system we used microspectrophotometry to determine the absorbance spectra of retinal oil droplets and to investigate whether the ocular media (i.e. the lens and cornea) absorb UV radiation.\u00a0In vitro\u00a0expression and reconstitution was used to determine the absorbance spectra of rod and cone visual pigments. The rod visual pigments had wavelengths of peak absorbance (\u03bbmax) at 500 nm, whereas the cone visual pigment \u03bbmax\u00a0values were determined to be 404 nm (SWS1), 450 nm (SWS2), 499 nm (RH2) and 561 nm (LWS), similar to other characterized bird visual pigment absorbance values. The oil droplet cut-off wavelength (\u03bbcut) values similarly fell within ranges recorded in other avian species: 576 nm (R-type), 522 nm (Y-type), 506 nm (P-type) and 448 nm (C-type). We confirm that\u00a0G. americana\u00a0has a violet-sensitive visual system; however, as a consequence of the \u03bbmax\u00a0of the SWS1 visual pigment (404 nm), it might also have some UV sensitivity.",
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