Anisotropic lattice distortions in biogenic calcite induced by intra-crystalline organic molecules
Anisotropic lattice distortions in biogenic calcite induced by intra-crystalline organic molecules
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DOI：
10.1016/j.jsb.2006.03.008
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发表时间：
2006-07-01
影响因子：
3
通讯作者：
Zolotoyabko, Emil
中科院分区：
文献类型：
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作者：
Pokroy, Boaz;Fitch, Andrew N.;Zolotoyabko, Emil
我们已经进行了精确的结构测量五个不同的方解石贝壳高分辨率X射线粉末衍射同步辐射光束线和实验室单晶X射线衍射。生物方解石的晶胞参数a和c被发现是系统大于那些在非生物方解石测量。最大晶格畸变（约2（.）10（-3））。在200 ℃以上的热处理条件下，观察到明显的晶格弛豫，这使我们能够得出结论，生物成因方解石中的各向异性晶格膨胀是由生物矿化过程中单晶方解石棱柱中掺入的有机大分子引起的。这一结论得到了从其中一个壳中提取的特定蛋白质存在下的结晶实验结果的支持。(c)2006爱思唯尔公司All rights reserved.
We have performed precise structural measurements on five different calcitic seashells by high-resolution X-ray powder diffraction on a synchrotron beam line and by laboratory single crystal X-ray diffraction. The unit cell parameters a and c of biogenic calcite were found to be systematically larger than those measured in the non-biogenic calcite. The maximum lattice distortion (about 2 (.) 10(-3)) was detected along the c-axis. Under heat treatment above 200 degrees C, a pronounced lattice relaxation was observed, which allowed us to conclude that anisotropic lattice swelling in biogenic calcite is induced by organic macromolecules incorporated within the single crystal calcitic prisms during biomineralization. This conclusion is supported by the results of crystallization experiments in the presence of specific protein extracted from one of the shells. (c) 2006 Elsevier Inc. All rights reserved.