Results 91 to 100 of about 5,074 (174)

Calcite Twinning in Mollusk Shells and Carrara Marble

Advanced Functional Materials, Volume 34, Issue 35, August 28, 2024.
Deformation twinning occurs in Carrara marble and appears in polarized light microscopy as parallel lines in calcite crystals (bottom left). Twins are known to harden and toughen calcite crystals. Twins are never observed within mollusk shell calcite prisms (top left).
Cristina Castillo Alvarez, John L. Grimsich, Connor A. Schmidt, Harrison Lisabeth, Anne Voigtländer, Pupa U. P. A. Gilbert   +5 more
wiley   +1 more source

The pearl oyster (Pinctada margaritifera) aquaculture in French Polynesia and the indirect impact of long-distance transfers and collection-culture site combinations on pearl quality traits

Aquaculture Reports, 2019
In French Polynesia, the P. margaritifera pearl aquaculture industry is spread over a vast area, as large as Europe. All the oysters for this the highly economically important activity are supplied from just a few collection lagoons, but they are grown ...
Chin-Long Ky, Floriane Broustal, Dan Potin, Cédrik Lo   +3 more
doaj   +1 more source

The archaeology of shellfishing practices on Ua Huka, Marquesas Archipelago (French Polynesia)

Archaeology in Oceania, Volume 59, Issue 2, Page 251-274, July 2024.
Abstract Shellfish remains are ubiquitous to coastal archaeological sites in the Marquesas but have seldom been the focus of dedicated investigations into their contribution to past diet and daily life. On the island of Ua Huka, in the northern group of the archipelago, people have consumed a variety of shellfish since their arrival on the island ...
Gabrielle Traversat, Eric Conte, Guillaume Molle   +2 more
wiley   +1 more source

Challenging trophic position assessments in complex ecosystems: Calculation method, choice of baseline, trophic enrichment factors, season and feeding guild do matter: A case study from Marquesas Islands coral reefs

Ecology and Evolution, Volume 14, Issue 7, July 2024.
Abstract Assessments of ecosystem functioning are a fundamental ecological challenge and an essential foundation for ecosystem‐based management. Species trophic position (TP) is essential to characterize food web architecture. However, despite the intuitive nature of the concept, empirically estimating TP is a challenging task due to the complexity of ...
Yves Letourneur, Pauline Fey, Jan Dierking, René Galzin, Valeriano Parravicini   +4 more
wiley   +1 more source

Exploring the Mineral Composition, Structure, and Function of a Freshwater Bivalve Adhesive

Advanced Materials Interfaces, Volume 11, Issue 17, June 17, 2024.
The freshwater oyster, Etheria elliptica, produces a mineralized adhesive consisting of aragonite nanoparticles that are less dense and more crystallographically disordered at the exterior than at the interior of the adhesive. The resulting material has a gradient in hardness and elasticity with the adhesive closest to the exterior being softer and ...
Rebecca A. Metzler, Julia Zaborowsky, Leon Nichols, Jack Underhill, Jack Tregidga, Chelsea Rogers, Deniz Rende, Steven Bouillon, David P. Gillikin   +8 more
wiley   +1 more source

Effects of microalgae diets on growth, proximate, and fatty acid composition of black mussel, Mytilus galloprovincialis

Journal of the World Aquaculture Society, Volume 55, Issue 3, June 2024.
Abstract This study evaluates the growth, proximate, and fatty acid composition of black mussel, Mytilus galloprovincialis fed four marine microalgae (Pavlova lutheri, Nannochloropsis oculata, Diacronema vlkianum and Rhinomonas reticulata) diets for 21 days.
Kamil Mert Eryalçın, Zeynep Sena Pınarbaşı, Sare Sena Turk, Merve Tınkır   +3 more
wiley   +1 more source

Virus-like particles in pearl oyster Pinctada margaritifera [PDF]

, 1999
Virus-like particles were detected in granulomas associated with focal necrosis within the adductor muscle of the pearl oyster Pinctada margaritifera from French Polynesia. About 40 nm in size, the se particles were generally found within cytoplasmic vesic1es inside heavily degenerated granulocytes.
Comps, Michel, Herbaut, C, Fougerouse, Angelique   +2 more
openaire  

Maturation de l’huître perlière Pinctada margaritifera aux îles Gambier [PDF]

, 2003
Le cycle reproducteur de l’huître perlière a été étudié de septembre 2002 à août 2003 sur des échantillons de 30 individus initialement âgés de 2 ans prélevés à intervalles de 15 jours sur une filière d’élevage dans le lagon de Rikitea aux îles Gambier.
Cochard, Jean-Claude, Tiapari, Jerome, Teissier, Hinano, Le Moullac, Gilles   +3 more
openaire   +1 more source

Use of Natural Antimicrobial Peptides and Bacterial Biopolymers for Cultured Pearl Production

Marine Drugs, 2015
Cultured pearls are the product of grafting and rearing of Pinctada margaritifera pearl oysters in their natural environment. Nucleus rejections and oyster mortality appear to result from bacterial infections or from an inappropriate grafting practice ...
Christelle Simon-Colin, Yannick Gueguen, Evelyne Bachere, Achraf Kouzayha, Denis Saulnier, Nicolas Gayet, Jean Guezennec   +6 more
doaj   +1 more source

An overview of Principal Components Analysis approaches in Raman studies of cultural heritage materials

Journal of Raman Spectroscopy, Volume 55, Issue 2, Page 125-147, February 2024.
The present overview answers the need of evaluating the current state of the art concerning the application of principal components analysis (PCA) to Raman spectroscopy studies of cultural heritage materials. Painting materials, both colouring and binding ones, were considered, together with natural and synthetic glasses, biogenic and mineral ...
Alessia Coccato, Maria Cristina Caggiani
wiley   +1 more source