Mineral bridges in nacre

Checa, António; Cartwright, Julyan H. E.; Willinger, Marc Georg

doi:10.1016/j.jsb.2011.09.011

Cited by 160 publications

(137 citation statements)

References 37 publications

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“…Previous studies suggest that in many cases the asperities only protrude [35]. The difference in the surface area covered by the nanoasperities and the area comprised by the holes in the membrane of the organic interlayer agrees with these previous results.…”

Section: Resultssupporting

confidence: 89%

A Comparison on the Structural and Mechanical Properties of Untreated and Deproteinized Nacre

López

Chen

McKittrick

et al. 2014

Ceramic Transactions Series

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The contribution of the individual constituents of red abalone (Haliotis rufescens) to the strength of the nacre structure is investigated. Nacre sections were deproteinized to establish the contribution of the organic components. Tensile testing, scratch, and nanoindentation tests are performed on the isolated mineral constituent (deproteinized nacre) and the untreated nacre of red abalone shell. Specimens are characterized by scanning electron and atomic force microscopies to verify the deformation mechanisms. Results obtained from the isolated mineral validate the importance of the organic constituent, as the mechanical properties decline greatly when the organic component is removed. Scratch tests reveal the anisotropy of the material and the effects of the thick layers of protein (mesolayers) on the deformation behavior. This approach confirms the importance of the integrated structure to the overall mechanical behavior of nacre.

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Section: Resultssupporting

confidence: 89%

A Comparison on the Structural and Mechanical Properties of Untreated and Deproteinized Nacre

López

Chen

McKittrick

et al. 2014

Ceramic Transactions Series

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show abstract

“…This can be seen as a pre-requisite for the crystallization of the tablets into "single crystals". By contrast, Checa et al (2011) demonstrated that nacre tablets do not nucleate onto the ILMs. According to them, the consecutive tablets therefore acquire a structural continuity (homo-or heteroepitaxy) by "organic-mineral bridges", which have recently been detected in Nautilus, and are usually aligned along the nacre-tower axes (Checa et al 2011).…”

Section: Septal Precipitation Modelmentioning

confidence: 95%

Ammonoid Septa and Sutures

Klug

Hoffmann

2015

Topics in Geobiology

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“…Pores called mineral bridges connect the upper and lower aragonite tablets separated by organic sheets. A previous study showed that the mineral bridge in gastropods penetrates the center of aragonite tablets (Checa et al 2009), whereas the mineral bridge in bivalves is formed from the contact point of two aragonite tablets (Checa et al 2011). An earlier study showed that nano-sized aragonite crystals nucleate in random crystallographic orientation inside dimples on the surface of the organic matrix that covers the outer prismatic calcite of the prismatic layer ).…”

Section: -2 Organic Matricesmentioning

confidence: 99%

Studies on the Chemical Structures of Organic Matrices and Their Functions in the Biomineralization Processes of Molluscan Shells

Suzuki¹,

Kogure²,

Nagasawa³

2017

AGri-Biosci. Monogr. (AGBM)

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Keywordscalcium carbonate and an organic matrix. In the course of shell formation, the periostracum, which is not mineralized and covers the external surface of the shell, is formed first; subsequently, the prismatic layer is formed on the periostracum. Finally, the nacreous layer is formed on the prismatic layer (Checa 2000). The nacreous layer is made of tablets of aragonite single crystals. The aragonite crystal compartment in the nacreous layer is sandwiched between sheets of organic matrix. In contrast, the prismatic layer is composed of columnar calcite surrounded by the organic matrix. The calcite crystals, surrounded by the organic framework, are oriented on the c-axis perpendicular to the shell surface.The microstructure of the shell of the limpet, Lottia kogamogai, consists of five distinct layers stacked in Studies on the Chemical Structures of Organic Matrices and Their Functions in the Biomineralization Processes of Molluscan Shells AbstractMolluscan shells protect the soft body from predators and the external environment and consist of calcium carbonate in an organic matrix. The interaction between calcium carbonate and the organic matrix forms the microstructure of the molluscan shell. In this review, we discuss several organic molecules that may be important in the formation of the shell microstructure. The iridescent color of pearls is attributed to the characteristic nacreous microstructure of molluscan shells. The Japanese pearl oyster, Pinctada fucata, is used in pearl aquaculture in Japan. The shell of P. fucata consists of two layers, prismatic and nacreous. Prismalin-14 in the prismatic layer interacts with calcium carbonate and binds to chitin. Pif in the nacreous layer interacts with aragonite crystals and plays important roles in forming the organic framework in a compartment-like structure. In contrast, limpets have a crossed lamellar microstructure in their shells. The organic matrices of limpet shells induce the formation of spindle-like aragonite crystals. Recent studies have increased our understanding of the calcification process of molluscan shells, and the findings can be applied to increase yields of high-quality pearls, lowering the cost and energy of pearl aquaculture.

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Mineral bridges in nacre

Cited by 160 publications

References 37 publications

A Comparison on the Structural and Mechanical Properties of Untreated and Deproteinized Nacre

A Comparison on the Structural and Mechanical Properties of Untreated and Deproteinized Nacre

Ammonoid Septa and Sutures

Studies on the Chemical Structures of Organic Matrices and Their Functions in the Biomineralization Processes of Molluscan Shells

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