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Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)

Tridacna derasa shells show a crossed lamellar microstructure consisting of three hierarchical lamellar structural orders. The mineral part is intimately intergrown with 0.9 wt% organics, namely polysaccharides, glycosylated and unglycosylated proteins and lipids, identified by Fourier transform inf...

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Detalles Bibliográficos
Autores principales: Agbaje, O. B. A., Wirth, R., Morales, L. F. G., Shirai, K., Kosnik, M., Watanabe, T., Jacob, D. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5627105/
https://www.ncbi.nlm.nih.gov/pubmed/28989765
http://dx.doi.org/10.1098/rsos.170622
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author Agbaje, O. B. A.
Wirth, R.
Morales, L. F. G.
Shirai, K.
Kosnik, M.
Watanabe, T.
Jacob, D. E.
author_facet Agbaje, O. B. A.
Wirth, R.
Morales, L. F. G.
Shirai, K.
Kosnik, M.
Watanabe, T.
Jacob, D. E.
author_sort Agbaje, O. B. A.
collection PubMed
description Tridacna derasa shells show a crossed lamellar microstructure consisting of three hierarchical lamellar structural orders. The mineral part is intimately intergrown with 0.9 wt% organics, namely polysaccharides, glycosylated and unglycosylated proteins and lipids, identified by Fourier transform infrared spectrometry. Transmission electron microscopy shows nanometre-sized grains with irregular grain boundaries and abundant voids. Twinning is observed across all spatial scales and results in a spread of the crystal orientation angles. Electron backscatter diffraction analysis shows a strong fibre texture with the [001] axes of aragonite aligned radially to the shell surface. The aragonitic [100] and [010] axes are oriented randomly around [001]. The random orientation of anisotropic crystallographic directions in this plane reduces anisotropy of the Young's modulus and adds to the optimization of mechanical properties of bivalve shells.
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spelling pubmed-56271052017-10-08 Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798) Agbaje, O. B. A. Wirth, R. Morales, L. F. G. Shirai, K. Kosnik, M. Watanabe, T. Jacob, D. E. R Soc Open Sci Chemistry Tridacna derasa shells show a crossed lamellar microstructure consisting of three hierarchical lamellar structural orders. The mineral part is intimately intergrown with 0.9 wt% organics, namely polysaccharides, glycosylated and unglycosylated proteins and lipids, identified by Fourier transform infrared spectrometry. Transmission electron microscopy shows nanometre-sized grains with irregular grain boundaries and abundant voids. Twinning is observed across all spatial scales and results in a spread of the crystal orientation angles. Electron backscatter diffraction analysis shows a strong fibre texture with the [001] axes of aragonite aligned radially to the shell surface. The aragonitic [100] and [010] axes are oriented randomly around [001]. The random orientation of anisotropic crystallographic directions in this plane reduces anisotropy of the Young's modulus and adds to the optimization of mechanical properties of bivalve shells. The Royal Society Publishing 2017-09-06 /pmc/articles/PMC5627105/ /pubmed/28989765 http://dx.doi.org/10.1098/rsos.170622 Text en © 2017 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Chemistry
Agbaje, O. B. A.
Wirth, R.
Morales, L. F. G.
Shirai, K.
Kosnik, M.
Watanabe, T.
Jacob, D. E.
Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title_full Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title_fullStr Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title_full_unstemmed Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title_short Architecture of crossed-lamellar bivalve shells: the southern giant clam (Tridacna derasa, Röding, 1798)
title_sort architecture of crossed-lamellar bivalve shells: the southern giant clam (tridacna derasa, röding, 1798)
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5627105/
https://www.ncbi.nlm.nih.gov/pubmed/28989765
http://dx.doi.org/10.1098/rsos.170622
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