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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society Publishing
2017
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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. |
format | Online Article Text |
id | pubmed-5627105 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | The Royal Society Publishing |
record_format | MEDLINE/PubMed |
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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