Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25075
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Biogenic calcite granules -- Are brachiopods different?
Authors: Perez-Huerta, Alberto
Dauphin, Yannicke
Cusack, Maggie
Contact Email: maggie.cusack@stir.ac.uk
Keywords: Calcite
Granules
Fibers
Semi-nacre
Amorphous calcium carbonate (ACC)
Issue Date: Jan-2013
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.
DOI Link: http://dx.doi.org/10.1016/j.micron.2012.09.005
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