期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 563, 期 -, 页码 47-53出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2021.05.067
关键词
Pearl oyster; Prismatic layer; Voronoi division; Thermodynamic force
资金
- National Fund for Fostering Talents of Basic Science [J1310020]
- National Natural Science Foundation of China [31572594, 31372502]
The study elucidates the evolution and interaction mechanisms between minerals and organic materials during the formation of bivalve mollusc shells. Results indicate that the shell materials undergo significant structural rearrangement and thermodynamically driven transitions during the process from horizontal expansion to vertical growth.
Biomimetic materials inspired by biominerals have substantial applications in various fields. The pris-matic layer of bivalve molluscs has extraordinary flexibility compared to inorganic CaCO3. Previous studies showed that in the early stage, minerals expanded horizontally and formed prism domains as a Voronoi division, while the evolution of the mature prisms were thermodynamically driven, which was similar to grain growth. However, it was unclear how the two processes were correlated during shell formation. In this study, we used scanning electronic microscopy and laser confocal scanning microscopy to look into the microstructure of the columnar prismatic layer in the pearl oyster Pinctada fucata. The Dirichlet centers of the growing domains in mature prisms were calculated, and the corresponding Voronoi division was reconstructed. It was found that the domain pattern did not fit the Voronoi division, indicating the driving forces of the mature prisms evolution and the initiation stage were different. During the transition from horizontal expansion to vertical growth, the minerals broke through the inner periostracum and squeezed out the organic materials to the inter-prism space. Re-arrangement of the organic framework pattern was driven by elastic relaxation at the vertices, indicating the transition process was thermodynamically driven. Our study provided insights into shell growth in bivalves and pave the way to synthesize three-dimensional material biomimetically (C) 2021 Elsevier Inc. All rights reserved.
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