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Article in Journal ()

Biogenic calcite granules -- Are brachiopods different?

Citation
Perez-Huerta A, Dauphin Y & Cusack M (2013) Biogenic calcite granules -- Are brachiopods different?, Micron, 44 (1), pp. 395-403.

Abstract
Brachiopods are still one of the least studied groups of organisms in terms of biomineralization despite recent studies indicating the presence of highly complex biomineral structures, particularly in taxa with calcitic shells. Here, we analyze the nanostructure of calcite biominerals, fibers and semi-nacre tablets, in brachiopod shells by high-resolution scanning electron microscopy (SEM) and atomic force microscopy (AFM). We demonstrate that basic mechanisms of carbonate biomineralization are not uniform within the phylum, with semi-nacre tablets composed of spherical aggregates with sub-rounded granules and fibers composed of large, triangular or rod-like particles composed of small sub-rounded granules (40-60. nm). Additionally, proteinaceous envelopes surrounding calcite fibers have been shown for the first time to have a dual function: providing a micro-environment in which granules are produced and acting as the organic template for particle orientation as fiber components. In summary, these new findings in brachiopod shells reveal a complex and distinctive style of biomineralization among carbonate-producing organisms. © 2012 Elsevier Ltd.

Keywords
Calcite; Granules; Fibers; Semi-nacre; Amorphous calcium carbonate (ACC)

StatusPublished
AuthorsPerez-Huerta Alberto, Dauphin Yannicke, Cusack Maggie
Publication date01/2013
Publication date online16/09/2012
Date accepted by journal04/09/2012
PublisherElsevier
ISSN 0968-4328
LanguageEnglish

Journal
Micron: Volume 44, Issue 1 (2013)

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