A synergetic biomineralization strategy for immobilizing strontium during calcification of the coccolithophore Emiliania huxleyi
A synergetic biomineralization strategy for immobilizing strontium during calcification of the coccolithophore Emiliania huxleyi
复制标题
在球石藻钙化过程中固定锶的协同生物矿化策略
DOI：
10.1007/s11356-018-1271-4
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发表时间：
2018
影响因子：
5.8
通讯作者：
Huo Tingting
中科院分区：
文献类型：
--
作者：
Sun Shiyong;Liu Mingxue;Nie Xiaoqin;Dong Faqin;Hu Wenyuan;Tan Daoyong;Huo Tingting
球石藻种Emiliania huxleyi是现代海洋中最具全球性的分布种之一。它们的特征是被称为球石的方解石鳞片覆盖。在这项研究中，稳定的锶固定在钙化过程中进行了调查，以间接评估拟议的生物修复方法，从海洋环境中去除Sr 2+污染。结果表明，E. huxleyi对Sr 2+具有很高的耐受性，并且对5.6至105.6 ppm范围内的Sr 2+胁迫具有很高的去除效率。Sr ~（2+）在E.赫胥黎钙化表明浓度依赖性协同机制。在较低浓度的Sr 2+（25.6 ppm）下，Sr 2+通过Sr 2+和Ca 2+之间的竞争供应结合到球石中。此外，方解石的生产率下降，增加Sr 2+的去除效率，由于从水合方解石到文石在55.6 ppm的Sr 2+的cocoliths的晶体转化。锶矿的进一步形成在105.6 ppm的Sr 2+是由于Sr 2+沉淀的边缘和放射状阵列的球晶石。我们的研究表明，颗石藻是能够显着的Sr 2+从海洋环境中的去除。
The coccolithophore species Emiliania huxleyi has one of the most global distributions in the modern oceans. They are characteristically covered with calcite scales called coccoliths. In this study, stable strontium immobilization during the calcification process was investigated to indirectly assess a proposed bioremediation approach for removing Sr2+contamination from marine environments. Results indicate that E. huxleyi has high Sr2+tolerance and removal efficiency in response to Sr2+stress ranging from 5.6 to 105.6 ppm. Sr2+immobilization during E. huxleyi calcification indicates a concentration-dependent synergistic mechanism. At lower concentrations of Sr2+(25.6 ppm), Sr2+is incorporated into coccoliths through competitive supply between Sr2+and Ca2+. In addition, calcite productivity decreases with increased Sr2+removal efficiency due to crystallographic transformation of coccoliths from hydrated calcite into aragonite at 55.6 ppm Sr2+. Further formation of strontianite at 105.6 ppm Sr2+is due to precipitation of Sr2+on the edge of the rims and radial arrays of the coccoliths. Our study implies that coccolithophores are capable of significant removal of Sr2+from the marine environment.