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Université d'Orléans |  |
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Université d'Orléans | |
| HAL : hal-00131385, version 1 |
| PubMed : 15681231 |
| DOI : 10.1016/j.jsb.2004.09.005 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Structural Biology 149, 2 (2005) 149-57 |
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| Sheet nacre growth mechanism: a Voronoi model. |
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| Marthe Rousseau 1, 2Evelyne Lopez 1 |
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| (02/2005) |
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| Shell nacre (mother of pearl) of Pinctada margaritifera was analyzed by scanning electron microscopy. The originality of this work concerns the sampling performed to observe incipient nacre on the mantle side. The whole animal is embedded in methyl methacrylate followed by separation of the shell from the hardened mantle. It is revealed this way how each future nacre layer pre-exists as a film or compartment. Experimental observations also show for the first time, the progressive lateral crystallization inside this film, finishing under the form of a non-periodic pattern of polygonal tablets of bio-aragonite. It is evidenced that nuclei appear in the film in the vicinity of the zone where aragonite tablets of the underlying layer get in contact to each other. A possible explanation is given to show how nucleation is probably launched in time and space by a signal coming from the underlying layer. Finally, it is evidenced that tablets form a Voronoi tiling of the space: this suggests that their growth is controlled by an "aggregation-like" process of "crystallites" and not directly by the aragonite lattice growth. |
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| 1 : | Biologie des organismes marins et écosystèmes (BOME) |
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CNRS : UMR5178 – Université Pierre et Marie Curie [UPMC] - Paris VI |
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| 2 : | Laboratoire de Sciences de la Terre (LST) |
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CNRS : UMR5570 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon |
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| 3 : | Laboratoire de tectonique (LT) |
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CNRS : UMR7072 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Cergy Pontoise |
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| 4 : | Laboratoire de minéralogie du Muséum National d'Histoire Naturelle (LMMNHN) |
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CNRS : FRE2456 |
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| 5 : | Institut des Sciences de la Terre d'Orléans (ISTO) |
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CNRS : UMR6113 – INSU – Université d'Orléans |
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| Domaine | : | Sciences du Vivant/Biochimie, Biologie Moléculaire/Biochimie |
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| Mother of pearl – Structure – Bio-mineralization – Organic matrix – Mechanism – SEM |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00131385, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00131385 | |
| oai:hal.archives-ouvertes.fr:hal-00131385 | |
| Contributeur : Francine Lallier | |
| Soumis le : Mercredi 21 Novembre 2007, 14:16:06 | |
| Dernière modification le : Mardi 21 Avril 2009, 11:14:46 | |
