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| Cuif, Jean-pierre; Burghammer, Manfred; Chamard, Virginie; Dauphin, Yannicke; Godard, Pierre; Le Moullac, Gilles; Nehrke, Gernot; Perez-huerta, Alberto. |
| Consistently classified among the references for calcite simple prisms, the microstructural units that form the outer layer of the Pinctada margaritifera have been investigated through a series of morphological, crystallographical and biochemical characterizations. It is often said that the polygonal transverse shape of the prisms result from the competition for space between adjacent crystals. In contrast to this classical scheme the Pinctada prisms appear to be composed of four successive developmental stages from the concentrically growing disks on the internal side of the periostracum to the morphological, structural and compositional changes in both envelopes and mineral components at the end of the prisms. These latest structural and compositional... |
| Tipo: Text |
Palavras-chave: Biomineralization; Bivalve shell; Microstructure; Calcite prisms. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00249/36039/34574.pdf |
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| Dauphin, Yannicke; Ball, Alexander D.; Castillo-michel, Hiram; Chevallard, Corinne; Cuif, Jean-pierre; Farre, Bastien; Pouvreau, Stephane; Salome, Murielle. |
| Cultivation of commercial oysters is now facing the possible influence of global change in sea water composition, commonly referred to as "ocean acidification". In order to test the potential consequence of the predicted environmental changes, a cultivation experiment was carried out. The left and right valves of the oyster shell Crassostrea gigas differ in their structure; moreover, lenses of non compact layers are irregular. The shell layers of juvenile C. gigas are studied using a variety of highly spatially resolved techniques to establish their composition and structure. Our results confirm the presence of three different calcitic structural types. The role of the lenses of chalky layers is not yet deciplered. Despite a common mineralogy, the... |
| Tipo: Text |
Palavras-chave: Biomineral; Mollusc shell; Infrared spectroscopy; Laser confocal Microscope; Micro-XANES. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00118/22890/20797.pdf |
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