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2 results on '"pearl layer development"'

1. Non‐spherical pearl layers in the Polynesian 'black‐lipped' Pinctada margaritifera: The non‐nacreous deposits compared to microstructure of the shell growing edge.

Author

Cuif, Jean‐Pierre, Dauphin, Yannicke, Luquet, Gilles, Belhadj, Oulfa, Rouzière, Stéphan, Salomé, Murielle, Cotte, Marine, Somogyi, Andrea, Medjoubi, Kadda, Lo, Cedrik, and Saulnier, Denis

Subjects
*PEARLS, *MICROSTRUCTURE, *BIOMINERALIZATION, *SIMILARITY (Geometry), *EDGES (Geometry), *MOTHER-of-pearl
Abstract

Cultivated pearls frequently exhibit morphological irregularities making obvious that mineral deposition was irregularly distributed onto nucleus surface. Taking advantage of experimental cultivations with short durations (from 10 days to few months), these irregular deposits predating occurrence of the nacre were investigated in Polynesian pearls by biochemical characterizations and a series of physical methods. Diversity in the resulting data suggests that various in‐depth alterations of the biomineralization mechanism may have occurred during the grafting process, leading to diversity in the biochemical pathways to nacreous deposition. This allows a precise discussion of current views about pearl formation. The "reversed shell theory" is formally disproved through point to point comparison with development of the shell growing edge. Similarity of pearl formation with "regeneration" or "shell repair" is also discussed, emphasizing the differences between these concepts. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Non‐spherical pearl layers in the Polynesian ‘black‐lipped’ Pinctada margaritifera : The non‐nacreous deposits compared to microstructure of the shell growing edge

Author

Marine Cotte, Cédrik Lo, Yannicke Dauphin, Denis Saulnier, Oulfa Belhadj, Stéphan Rouzière, Kadda Medjoubi, Murielle Salomé, Jean-Pierre Cuif, Andreas Somogyi, Gilles Luquet, Centre de Recherche en Paléontologie - Paris (CR2P), Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Systématique, Evolution, Biodiversité (ISYEB ), Muséum national d'Histoire naturelle (MNHN)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Department of Biomaterials [Potsdam], Max Planck Institute of Colloids and Interfaces, Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), European Synchrotron Radiation Facility (ESRF), Laboratoire d'Archéologie Moléculaire et Structurale (LAMS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Direction des Ressources Marines (DRM), Ministère de l'économie et des finances, Ecosystèmes Insulaires Océaniens (UMR 241) (EIO), Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), and Institut de Recherche pour le Développement (IRD)-Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)

Subjects
pearl cultivation, calcium carbonate microstructures, [SDV]Life Sciences [q-bio], Shell (structure), Mineralogy, Shell theory, Aquatic Science, engineering.material, Biology, Edge (geometry), 03 medical and health sciences, 14. Life underwater, [SDV.IB.BIO]Life Sciences [q-bio]/Bioengineering/Biomaterials, 030304 developmental biology, 0303 health sciences, pearl layer development, Pinctada margaritifera, 04 agricultural and veterinary sciences, Mineral deposition, biomineralization, Microstructure, biology.organism_classification, eye diseases, 040102 fisheries, engineering, 0401 agriculture, forestry, and fisheries, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology, Pearl, Biomineralization
Abstract

International audience; Cultivated pearls frequently exhibit morphological irregularities making obvious that mineral deposition was irregularly distributed onto nucleus surface. Taking advantage of experimental cultivations with short durations (from 10 days to few months), these irregular deposits predating occurrence of the nacre were investigated in Polynesian pearls by biochemical characterizations and a series of physical methods. Diversity in the resulting data suggests that various in‐depth alterations of the biomineralization mechanism may have occurred during the grafting process, leading to diversity in the biochemical pathways to nacreous deposition. This allows a precise discussion of current views about pearl formation. The “reversed shell theory” is formally disproved through point to point comparison with development of the shell growing edge. Similarity of pearl formation with “regeneration” or “shell repair” is also discussed, emphasizing the differences between these concepts.

Published
2019
Full Text
View/download PDF

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