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Colour-producing β-keratin nanofibres in blue penguin (Eudyptula minor) feathers

D'Alba, Liliana ; Saranathan, Vinodkumar ; Clarke, Julia A. ; Vinther, Jakob A. ; Prum, Richard O. ; Shawkey, Matthew D.

Biology letters (2005), 2011-08, Vol.7 (4), p.543-546 [Periódico revisado por pares]

England: The Royal Society

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  • Título:
    Colour-producing β-keratin nanofibres in blue penguin (Eudyptula minor) feathers
  • Autor: D'Alba, Liliana ; Saranathan, Vinodkumar ; Clarke, Julia A. ; Vinther, Jakob A. ; Prum, Richard O. ; Shawkey, Matthew D.
  • Assuntos: Animals ; beta-Keratins - chemistry ; Biophotonics ; Biophysics ; Color ; Eudyptula minor ; Feathers - chemistry ; Feathers - ultrastructure ; Marine ; Microscopy, Electron, Transmission ; Nanofibers - chemistry ; Nanofibres ; Spheniscidae - anatomy & histology ; Structural Colour
  • É parte de: Biology letters (2005), 2011-08, Vol.7 (4), p.543-546
  • Notas: ArticleID:rsbl20101163
    href:rsbl20101163.pdf
    ark:/67375/V84-35ZVBDL2-G
    These authors contributed equally to the study.
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    ObjectType-Article-1
    SourceType-Scholarly Journals-1
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    content type line 23
  • Descrição: The colours of living organisms are produced by the differential absorption of light by pigments (e.g. carotenoids, melanins) and/or by the physical interactions of light with biological nanostructures, referred to as structural colours. Only two fundamental morphologies of non-iridescent nanostructures are known in feathers, and recent work has proposed that they self-assemble by intracellular phase separation processes. Here, we report a new biophotonic nanostructure in the non-iridescent blue feather barbs of blue penguins (Eudyptula minor) composed of parallel β-keratin nanofibres organized into densely packed bundles. Synchrotron small angle X-ray scattering and two-dimensional Fourier analysis of electron micrographs of the barb nanostructure revealed short-range order in the organization of fibres at the appropriate size scale needed to produce the observed colour by coherent scattering. These two-dimensional quasi-ordered penguin nanostructures are convergent with similar arrays of parallel collagen fibres in avian and mammalian skin, but constitute a novel morphology for feathers. The identification of a new class of β-keratin nanostructures adds significantly to the known mechanisms of colour production in birds and suggests additional complexity in their self-assembly.
  • Editor: England: The Royal Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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