Yannicke Dauphin

Multiscale Analysis of Nacre Formation: Mapping Growth-Induced Structural Changes in the Black-Lip Pearl Oyster shell

Jean‐Pierre Cuif, Yannicke Dauphin

Pearls are produced through a grafting process; however, the complex interactions between the soft tissues, the "mother" oyster shell, and the resulting pearls are not yet fully understood. The criteria for classifying pearl quality depend on the appearance of the outer surface—specifically, …

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Navigating the Limits: Unraveling Unidentified Fossil Bone and Tooth Fragments Through Histology, Chemistry, and Multivariate Statistics

Yannicke Dauphin

For paleoenvironmental reconstruction, paleontologists prefer large, well-preserved fossils. Yet, such specimens are rare, and countless small fragments, though abundant, often go unused. These fragments lack visible internal structure, thus requiring etching, a procedure not permitted on large, intact specimens. Our research introduces …

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Coprolite Multimodal Analysis: A Tool for Hyaenid Predator Identification

Yannicke Dauphin, Jean‐Philip Brugal

Paleontologists and archeologists reconstruct ancient ecosystems using data from carnivores' food remains. Carnivores have evolved to employ two primary feeding strategies: consuming mostly meat and focusing on both meat and bones, and these strategies result in the production of different feces. Hyenas …

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Structure versus composition: a comparative study across scales

Yannicke Dauphin, Cédrik Lo, Gergely Németh, Christophe Sandt et autres

We evaluate the capabilities of various IR spectroscopy techniques using mollusk shells, for which non-IR data are available.

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Connecting length scales: general discussion

Oliver Ayre, Sofia Ceseri, Virginie Chamard, Thorbjørn Erik Køppen Christensen et autres

Adrian Rodriguez-Palomo opened discussion of the paper by Marc D. McKee: Do you think it would be interesting to study the crystallography of your mineral clusters? Would you expect that parameters are a bit more distorted compared with the rest of the …

Crystal nucleation in biominerals: general discussion

Oliver Ayre, Thierry Azaı̈s, Natercia Barbosa, Luca Bertinetti et autres

Oliver Ayre opened the discussion of the introductory Spiers Memorial Lecture by Laurie Gower: Within the stippled particles, you said oriented attachment occurred to arrange the mineral component into fibres. Doesn’t this mean the minerals are crystalline at this stage? Laurie Gower …

Interfaces at the nano scale: general discussion

Oliver Ayre, Thierry Azaı̈s, Natercia Barbosa, Henrik Birkedal et autres

Reham Gonnah opened a general discussion of the paper by Virginie Chamard by communicating: How did you quantify the prism alignment along the shell border (https://doi.org/10.1039/d5fd00020c)? Virginie Chamard communicated in reply: The ESRF-ID13 beamline presents some geometrical constraints. Basically, the det

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Increasing Structural Diversity of the Early Growth Stages in Polynesian Pearls Reveals Biological Stress Suffered by the Grafts

Jean‐Pierre Cuif, Yannicke Dauphin, Marc Gèze, Cédrik Lo et autres

In Polynesian pearls produced using Pinctada margaritifera var. Cumingii, we investigated the structure of the early growth stages, from the nucleus surface up to the first deposition of the black nacre characteristic of this subspecies. Despite simultaneous grafting from the same donor …

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Evidence of a Scheduled End for Prism Growth in the Shell of Pinctada margaritifera: Closure of the Calcite Biomineralization Area by a Specific Organic Membrane

Jean‐Pierre Cuif, Cédrik Lo, Yannicke Dauphin

The shell of the pearl oyster Pinctada margaritifera is made up of two layers: an outer layer of calcite prisms and an inner layer of aragonite tablets. Recent studies have shown that the calcite layer develops in a series of steps. We …

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Formation of the Outer Shell Layer in Pinctada margaritifera: Structural and Biochemical Evidence for a Sequential Development of the Calcite Units

Jean‐Pierre Cuif, Angélique Fougerouse, Cédrik Lo, Yannicke Dauphin

Calcite prismatic units that form the outer layers of “nacro-prismatic” Pelecypod shells are often used as biomineralization models due to their individual size, simple shape, and spatial arrangement. However, these models do not take into account the developmental history of the shell. …

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Calcitic Prisms of The Giant Seashell Pinna Nobilis Form Light Guide Arrays

Shahrouz Amini, Tingting Zhu, Abin Biswas, Mohammad A. Charsooghi et autres

The shells of the Pinnidae family are based on a double layer of single-crystal-like calcitic prisms and inner aragonitic nacre, a structure known for its outstanding mechanical performance. However, on the posterior side, shells are missing the nacreous layer, which raises the …

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Integrated Information on the Structure and Composition of the Ostrich Eggshell (Struthio camelus)

Alberto Pérez‐Huerta, Jean‐Philip Brugal, Murielle Salomé, Clemens N. Z. Schmitt et autres

Ostrich eggshells are excellent examples of avian biomineralization. Interest in these eggshells is focused on their potential as a food source, example of a biomaterial for medical and industrial applications, and the use of fossil remains for paleoenvironmental reconstructions. Due to this …

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