Nucleation and Growth of Mg-Calcite Spherulites Induced by the Bacterium Curvibacter lanceolatus Strain HJ-1
Nucleation and Growth of Mg-Calcite Spherulites Induced by the Bacterium Curvibacter lanceolatus Strain HJ-1
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DOI：
10.1017/s1431927617012715
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发表时间：
2017-12
影响因子：
2.8
通讯作者：
Chonghong Zhang;J. Lv;Fuchun Li;Xuelin Li
中科院分区：
文献类型：
--
作者：
Chonghong Zhang;J. Lv;Fuchun Li;Xuelin Li
摘要 在许多不同细菌的实验室实验中都观察到了方解石球晶，并且球晶的生长在矿物学研究中引起了人们的广泛兴趣。然而，方解石球晶在细菌溶液中的成核和生长机制以及地质意义仍不清楚。在此，由Curvibacter lanceolatus HJ-1菌株在Mg/Ca摩尔比为3的溶液中沉淀出由非晶核、镁方解石体和有机膜组成的球晶。基于结果，我们为镁方解石球晶的生物矿化提供了可能的机制。首先，无定形碳酸钙颗粒沉积并与有机分子结合聚集成稳定的球状核心。然后，核心充当球晶径向生长的核心。最后，由于细菌代谢和钙化，有机膜在镁方解石球晶表面生长。这些发现提供了对生物矿化过程中生物球晶的生长模式和结晶的深入了解，对新型生物材料的应用具有重要意义。
Abstract Calcite spherulites have been observed in many laboratory experiments with different bacteria, and spherulitic growth has received much interest in mineralogy research. However, the nucleation and growth mechanism, as well as geological significance of calcite spherulites in solution with bacteria is still unclear. Herein, spherulites composed of an amorphous core, a Mg-calcite body and an organic film were precipitated by the Curvibacter lanceolatus HJ-1 bacterial strain in a solution with a molar Mg/Ca ratio of 3. Based on the results, we provide a possible mechanism for the biomineralization of Mg-calcite spherulites. First, amorphous calcium carbonate particles are deposited and aggregated into a stable sphere-like core in combination with organic molecules. The core then acts as the nucleus of spherulitic radial growth. Finally, the organic film grows on the surface of Mg-calcite spherulites as a result of bacterial metabolism and calcification. These findings provide insight into the growth mode and crystallization of biogenic spherulites during biomineralization, and are of significance in the application of novel biological materials.