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Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre

Currently a basic tenet in biomineralization is that biominerals grow by accretion of amorphous particles, which are later transformed into the corresponding mineral phase. The globular nanostructure of most biominerals is taken as evidence of this. Nevertheless, little is known as to how the amorph...

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Autores principales: Macías-Sánchez, Elena, Willinger, Marc G., Pina, Carlos M., Checa, Antonio G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5629257/
https://www.ncbi.nlm.nih.gov/pubmed/28983081
http://dx.doi.org/10.1038/s41598-017-12673-0
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author Macías-Sánchez, Elena
Willinger, Marc G.
Pina, Carlos M.
Checa, Antonio G.
author_facet Macías-Sánchez, Elena
Willinger, Marc G.
Pina, Carlos M.
Checa, Antonio G.
author_sort Macías-Sánchez, Elena
collection PubMed
description Currently a basic tenet in biomineralization is that biominerals grow by accretion of amorphous particles, which are later transformed into the corresponding mineral phase. The globular nanostructure of most biominerals is taken as evidence of this. Nevertheless, little is known as to how the amorphous-to-crystalline transformation takes place. To gain insight into this process, we have made a high-resolution study (by means of transmission electron microscopy and other associated techniques) of immature tablets of nacre of the gastropod Phorcus turbinatus, where the proportion of amorphous calcium carbonate is high. Tablets displayed a characteristic nanoglobular structure, with the nanoglobules consisting of an aragonite core surrounded by amorphous calcium carbonate together with organic macromolecules. The changes in composition from the amorphous to the crystalline phase indicate that there was a higher content of organic molecules within the former phase. Within single tablets, the crystalline cores were largely co-oriented. According to their outlines, the internal transformation front of the tablets took on a complex digitiform shape, with the individual fingers constituting the crystalline cores of nanogranules. We propose that the final nanogranular structure observed is produced during the transformation of ACC into aragonite.
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spelling pubmed-56292572017-10-17 Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre Macías-Sánchez, Elena Willinger, Marc G. Pina, Carlos M. Checa, Antonio G. Sci Rep Article Currently a basic tenet in biomineralization is that biominerals grow by accretion of amorphous particles, which are later transformed into the corresponding mineral phase. The globular nanostructure of most biominerals is taken as evidence of this. Nevertheless, little is known as to how the amorphous-to-crystalline transformation takes place. To gain insight into this process, we have made a high-resolution study (by means of transmission electron microscopy and other associated techniques) of immature tablets of nacre of the gastropod Phorcus turbinatus, where the proportion of amorphous calcium carbonate is high. Tablets displayed a characteristic nanoglobular structure, with the nanoglobules consisting of an aragonite core surrounded by amorphous calcium carbonate together with organic macromolecules. The changes in composition from the amorphous to the crystalline phase indicate that there was a higher content of organic molecules within the former phase. Within single tablets, the crystalline cores were largely co-oriented. According to their outlines, the internal transformation front of the tablets took on a complex digitiform shape, with the individual fingers constituting the crystalline cores of nanogranules. We propose that the final nanogranular structure observed is produced during the transformation of ACC into aragonite. Nature Publishing Group UK 2017-10-05 /pmc/articles/PMC5629257/ /pubmed/28983081 http://dx.doi.org/10.1038/s41598-017-12673-0 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Macías-Sánchez, Elena
Willinger, Marc G.
Pina, Carlos M.
Checa, Antonio G.
Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title_full Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title_fullStr Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title_full_unstemmed Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title_short Transformation of ACC into aragonite and the origin of the nanogranular structure of nacre
title_sort transformation of acc into aragonite and the origin of the nanogranular structure of nacre
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5629257/
https://www.ncbi.nlm.nih.gov/pubmed/28983081
http://dx.doi.org/10.1038/s41598-017-12673-0
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