Structural characterisation of X-ray amorphous calcium carbonate (ACC) in sternal deposits of the crustacea Porcellio scaber
Structural characterisation of X-ray amorphous calcium carbonate (ACC) in sternal deposits of the crustacea Porcellio scaber
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DOI：
10.1039/b210529b
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发表时间：
2003-01-01
影响因子：
4
通讯作者：
Ziegler, A
中科院分区：
文献类型：
--
作者：
Becker, A;Bismayer, U;Ziegler, A
用高分辨率X射线衍射、X射线吸收光谱和红外显微镜分析了陆地木虱（甲壳纲，Porcellio scaber）的矿床。碳酸钙储存在前四个胸骨前改变角质层（壳）。这些沉积物由完全X射线无定形碳酸钙（初级粒度小于100埃）组成。短程有序与结晶碳酸钙相（第一配位壳层）相当，但在超过约3埃时存在增加的结构无序。这种高度的结构无序提供了高溶解度，即在生物系统内容易移动。结果进行了比较与EXAFS数据从文献上其他生物无定形碳酸钙。
Mineral deposits in land-based woodlice (crustacea, Porcellio scaber) were analysed by high-resolution X-ray diffraction, X-ray absorption spectroscopy (EXAFS) and infrared microscopy. Calcium carbonate is stored within the first four anterior sternites before changing the cuticle (shell). These deposits consist of fully X-ray amorphous calcium carbonate (primary particle size less than 100 Angstrom). The short-range order is comparable to crystalline calcium carbonate phases (first coordination shell), but there is increasing structural disorder beyond about 3 Angstrom. This high degree of structural disorder gives a high solubility, i.e. an easy mobilisation within the biological system. The results are compared with EXAFS data from the literature on other biogenic amorphous calcium carbonates.