Fluorine in Shark Teeth: Its Direct Atomic-Resolution Imaging and Strengthening Function
Fluorine in Shark Teeth: Its Direct Atomic-Resolution Imaging and Strengthening Function
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鲨鱼牙齿中的氟：其直接原子分辨率成像和强化功能
DOI：
10.1002/ange.201307689
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Y. Ikuhara
中科院分区：
文献类型：
--
作者：
C. L. Chen;Z. C. Wang*;M. Saito;T. Tohei;Y. Takano;and Y. Ikuhara
束敏感生物矿物的原子分辨率成像是极具挑战性的，由于其相当复杂的结构和电子辐照造成的损伤。在这里，我们通过使用低剂量成像技术进行像差校正电子显微镜来克服这些困难，并报告了鲨鱼牙齿釉质复杂氟磷灰石结构中每个单独原子柱的成功直接原子分辨率成像，这对牙齿通常至关重要。我们证明，鲨鱼牙釉质中的每一个原子柱都可以空间分辨，并具有复杂的氟磷灰石结构。此外，从头计算表明，氟原子可以共价键合到周围的钙原子上，这提高了对它们在鲨鱼牙齿中减少龋齿作用的理解。
Atomic‐resolution imaging of beam‐sensitive biominerals is extremely challenging, owing to their fairly complex structures and the damage caused by electron irradiation. Herein, we overcome these difficulties by performing aberration‐corrected electron microscopy with low‐dose imaging techniques, and report the successful direct atomic‐resolution imaging of every individual atomic column in the complex fluorapatite structure of shark tooth enameloid, which can be of paramount importance for teeth in general. We demonstrate that every individual atomic column in shark tooth enameloid can be spatially resolved, and has a complex fluorapatite structure. Furthermore, ab initio calculations show that fluorine atoms can be covalently bound to the surrounding calcium atoms, which improves understanding of their caries‐reducing effects in shark teeth.