期刊
JOURNAL OF STRUCTURAL BIOLOGY
卷 180, 期 3, 页码 539-545出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2012.09.011
关键词
Biomineralization; Mollusk shells; Crossed-lamellar layer; Twinning
资金
- Shore Research Fund in Advanced Composites
The structure of the gastropod Murex troscheli shell was investigated by using high-resolution scanning and transmission electron microscopies and high-resolution synchrotron X-ray powder diffraction. Rietveld refinement of X-ray diffraction patterns revealed anisotropic distortions of the orthorhombic aragonite unit cell, reaching a maximum of about 0.2% (along the c-direction) with respect to geological aragonite. Lattice distortions are effectively relieved under mild annealing at temperatures between 150 degrees C and 250 degrees C. This relaxation correlated well with the loss of organic substance during annealing, measured by thermal gravimetric analysis. The shell ultrastructure consists of three orders of hierarchy, which is typical for crossed-lamellar layers. The third-order fiber-like lamellae, nearly 50 x 250 nm(2) in cross-section, are heavily twinned, producing specific contrast features in transmission electron microscopy micrographs. So, higher orders of hierarchy are, in fact, twins, which boundaries are free of organic matter. (C) 2012 Elsevier Inc. All rights reserved.
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