期刊
MINERALOGICAL MAGAZINE
卷 72, 期 2, 页码 617-626出版社
MINERALOGICAL SOC
DOI: 10.1180/minmag.2008.072.2.617
关键词
biomineralization; atomic force microscopy; transmission electron microscopy; amorphous calcium carbonate
类别
资金
- European Science Foundation (ESF) [ERAS-CT-2003-980409]
- DG Research
- FP6
Atomic force microscopy (AFM) and transmission electron microscopy (TEM) were used to investigate the the Structure of the calcite prisms from the pearl-oyster shell Pinctada margaritifera. The AFM analysis shows that the prisms are made of densely packed circular micro-domains (in the 0.1 mu m range) surrounded by a dense cortex. The TEM images and diffraction patterns allow the internal structure of the micro-domains to be described. Each of them is enriched in Ca-carbonate. Hosted in distinct regions of each prism. some are fully amorphous, and some others fully crystallized as Subunits of a large calcite single crystal. At the border separating the two regions, micro-domains display a crystallized core and an amorphous rim. Such a border probably marks out an arrested crystallization front having propagated through a previously bio-controlled architecture of the piling of amorphous micro-domains. Compared to recent data concerning the stepping mode of growth of the calcite prisms and the resulting layered organization at the mu m-scale, these results give unexpected views regarding the modalities of biocrystallization.
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