Nacre morphology and chemical composition in Atlantic winged oyster <i>Pteria colymbus</i> (Röding, 1798)

Santana, Pablo; Aranda, Dalila Aldana

doi:10.7717/peerj.11527

Cited by 7 publications

(20 citation statements)

References 47 publications

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“…While verifying in the literature for any clue, we noticed that some scientific papers informed us of the presence of hematite (alpha-Fe 2 O 3 ) on the shells of bivalves [4,5,6]. The concentration of hematite on the shell composition is much less than 1% in weight.…”

Section: Introductionmentioning

confidence: 75%

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Characterization of magnetic nanoparticles from the shells of freshwater mussel L fortunei and marine P perna mussels

Cardoso

Souza

Dantas

et al. 2022

Preprint

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The presence of magnetite nanoparticles in animal species, including humans, has been growing steadily, but none have reported the presence in mollusks apart from the radula of chitons, in 1962. In shells this is the first time. Magnetite (Fe3O4) nanoparticles were extracted (using three distinct and rather simple protocols) from the shells of freshwater Limnoperna fortunei (Dunker 1857) and marine Perna perna (Linnaeus 1758) mussels and were fully physically-chemically characterized. Due to the spatial distribution, the ferrimagnetic particles in the shells are in low concentration and present a superparamagnetic behavior characteristic of materials of nanometric sizes. Transmission electron microscopy (TEM, especially HRTEM) indicated that the 50-100 nm round magnetite particles are in fact aggregates of 5-10 nm nanoparticles. Using analysis TEM techniques on the shell of the L fortunei we have not found any iron oxide particle at the periostracum layer nor in the calcite layer. Nevertheless, roughly round nanoparticle aggregates of iron hydroxy/oxide were found in the nacar layer, the aragonite layer. Being the aragonite layer responsible for more than 97% of the shell of the L fortunei and considering the estimated size of magnetite nanoparticles we could infer that they might be distributed throughout the nacar layer.

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Section: Introductionmentioning

confidence: 75%

“…Scientific articles published so far focus on the most diverse uses for the CaCO 3 present in shells [5]. However, to obtain the shell powder a heat treatment of up to 1000 o C or higher [6] is performed, oxidizing the nanoparticles into Fe 2 O 3 . Also, the presence of magnetite appears to occur in human organs including the human brain [42,43].…”

mentioning

confidence: 99%

Characterization of magnetic nanoparticles from the shells of freshwater mussel L fortunei and marine P perna mussels

Cardoso

Souza

Dantas

et al. 2022

Preprint

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“…There are two common structural modifications of CaCO 3 , Ca 2+ is 9-fold coordinated by O 2– in aragonite and 6-fold (octahedrally) coordinated in calcite. A vast majority of CaCO 3 platelets in nacre adopts the aragonite lattice. , Trace elements such as Mn, Fe, and Ba are structurally bound within aragonite, as is currently characterized by Raman imaging (Figure ), and by other techniques in many of the previous studies. ,, Using spin-resolved X-ray absorption and X-ray emission spectroscopy, Soldati et al demonstrate that Mn in aragonitic bivalve nacre is 6-fold coordinated with a rhodochrosite MnCO 3 lattice locally, which is yet accommodated in an aragonite host structure. That is the reason why we find Raman modes of MnCO 3 in the abnormal nacre, and this would also apply to FeCO 3 and BaCO 3 (Figures and ).…”

Section: Resultsmentioning

confidence: 99%

“…The trace element profile in the nacre of shells and pearls has long been the focus of scholars in the fields of gemology, biology, paleoclimatology, and environmental science. ,, However, few studies are available on the mechanism of trace element uptake into nacre. The present study demonstrates that Ca Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, and Ba contribute to the formation of the Edison pearl.…”

Section: Resultsmentioning

confidence: 99%

“…These models have developed our cognition on the formation process of nacre despite that many aspects of nacre growth are unknown. Considering that trace elements such as Mg, Mn, Fe, Zn Sr, and Ba in environments are frequently incorporated into shells and pearls during growth processes, ,− and a growing body of studies has proved that trace elements have an effect on organism metabolism and biomineralization, − the present study is devoted to the role of trace elements in the microstructure of nacre.…”

Section: Introductionmentioning

confidence: 99%

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Excessive Uptake of Trace Elements Results in an Abnormal Structure of Nacre

Gao

Zhang

Wu³

et al. 2022

Crystal Growth & Design

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Nacre of shells and pearls is a common biomineral produced by mollusks, containing a variety of trace elements. Little attention has been paid on the mechanisms of trace element uptake into nacre and its influence on the microstructure of nacre. This knowledge, however, is a prerequisite for our understanding of nacre biomineralization and holds implications for pearl cultivating technology, ecological environment, and materials sciences. Here, we give serious consideration on nacre with an abnormal microstructure of Edison pearls, discovering correlations between the trace element concentrations and the morphology and microstructure of the nacre. Edison pearls are a new breed of freshwater nucleated pearls. The scanning electron microscopy images show that the abnormal area in the nacre has a brick-and-mortar structure as the normal nacre, in which aragonite platelets alternate with organic materials. However, the aragonite platelets vary widely in thicknesses, littered with microcrystal cracks, and present clear color contrasts and a rugged surface. Much higher counts of trace elements are detected such as Mn, Fe, Zn, and Ba in the abnormal nacre, using synchrotron radiation micro-X-ray fluorescence imaging. The abnormal nacre exhibits Raman mode characteristic of multiple carbonate minerals, which suggests that these trace elements substitute for Ca in the aragonite lattice and distort the crystal lattice. In comparison with the peripheral normal nacre, there are lower concentrations of organic materials in the abnormal nacre and that may contribute to the formation of transversal and orthogonal platelet cracks. As a result, the abnormal nacre has a loose coupling structure. Formation of abnormal nacre has individual difference, and it is hypothesized that the metabolic abnormalities of visceral mass after operation procedure results in excessive uptake of trace elements and the consequent formation of abnormal nacre.

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Synchrotron Radiation μ-XRF Imaging Reveals Mn Zoning in Freshwater Pearls

Gao

Zhang

Wu³

et al. 2022

J. Phys. Chem. C

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Chemical zoning is commonly seen in inorganic minerals, and it holds implications for magmatic processes, hydrothermal evolution, or metal mineralization. However, few studies are available on oscillatory zoning in biominerals, which carries the most direct and unique information on the biomineralization mechanism. This study investigates spatial and temporal resolution of trace element distributions in pearls that were cultivated in the Hyriopsis cumingii mantle (non-nucleated pearls and nucleated Akoya pearls) or visceral mass (nucleated Edison pearls) for 1–5 years. Using synchrotron radiation micro-X-ray fluorescence imaging, we find a variety of trace elements such as Sc, Cr, Mn, Cu, Zn, Ge, and Ba. The types of trace elements are slightly different for individuals. For the first time, submillimeter-scale Mn zoning is identified ubiquitously, concentric with the pearl, and exhibits increased concentrations toward the pearl margin. In non-nucleated pearls and nucleated Akoya pearls, the Mn zones are superposed with a spatially damped pattern with a decrease in the interzones. In contrast, no damped trends are observed in the Mn zones in nucleated Edison pearls. This difference may be due to different cultivation sites within mollusks that have different requirements for Mn during pearl growth. We suggest a growth model of dissipative structure for the Mn zoning in pearls, which depends upon the coupling between the interface kinetics and the diffusion of chemical species in the environment. The trace elements (including Mn) substitute Ca in aragonite isomorphically, based on Raman imaging. The scanning electron microscopy images show a periodic structure of aragonite platelets and organic matter of pearls. Locally in the Mn zones, there are minor defects on platelets, which may arise from the enrichment of trace elements. This study would develop a new research field for chemical zoning in minerals and introduce a new angle in understanding trace element incorporation in biominerals and the biomineralization processes.

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Nacre morphology and chemical composition in Atlantic winged oyster Pteria colymbus (Röding, 1798)

Cited by 7 publications

References 47 publications

Characterization of magnetic nanoparticles from the shells of freshwater mussel L fortunei and marine P perna mussels

Characterization of magnetic nanoparticles from the shells of freshwater mussel L fortunei and marine P perna mussels

Excessive Uptake of Trace Elements Results in an Abnormal Structure of Nacre

Synchrotron Radiation μ-XRF Imaging Reveals Mn Zoning in Freshwater Pearls

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