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首页> 外文期刊>Advanced Functional Materials >Polymorph Selectivity of Coccolith-Associated Polysaccharides from Gephyrocapsa Oceanica on Calcium Carbonate Formation In Vitro
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Polymorph Selectivity of Coccolith-Associated Polysaccharides from Gephyrocapsa Oceanica on Calcium Carbonate Formation In Vitro

机译：大叶Gephyrocapsa oceanica球藻相关多糖对碳酸钙体外形成的多晶型选择性。

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摘要

Coccolith-associated polysaccharides (CAPs) are thought to be a key part of the biomineralization process in coccolithophores; however, their role is not fully understood. Two different systems that promote different polymorphs of calcium carbonate are used to show the effect of CAPs on nucleation and polymorph selection in vitro. Using a combination of time-resolved cryo-transmission electron microscopy and scanning electron microscopy, the mechanisms of calcite nucleation and growth in the presence of the intracrystalline fraction are examined containing CAPs extracted from coccoliths from Gephyrocapsa oceanica and Emiliania huxleyi, two closely related coccolithophore species. The CAPs extracted from G. oceanica are shown to promote calcite nucleation in vitro, even under conditions favoring the kinetic products of calcium carbonate, vaterite, and aragonite. This is not the case with CAPs extracted from E. huxleyi, suggesting that the functional role of CAPs in vivo may be different between the two species. Additionally, high-resolution synchrotron powder X-ray diffraction has revealed that the polysaccharide is located between grain boundaries of both calcite produced in the presence of the CAPs in vitro and biogenic calcite, rather than within the crystal lattice.
机译：球藻相关多糖（CAPs）被认为是球墨石生物矿化过程的关键部分。但是，它们的作用尚未完全了解。使用两种促进碳酸钙不同多晶型物的不同系统来显示CAP在体外对成核和多晶型物选择的影响。结合时间分辨的低温透射电子显微镜和扫描电子显微镜，研究了在晶体内级分存在下方解石成核和生长的机制，其中包含从两个亲缘关系密切的球藻属物种Gephyrocapsa oceanica和Emililiania huxleyi的球藻中提取的CAP。 。已显示，即使在有利于碳酸钙，球ate石和文石的动力学产物的条件下，从大洋茶中提取的CAPs也会在体外促进方解石成核。从赫希氏大肠杆菌中提取的CAP并非如此，这表明CAP在体内的功能作用在这两个物种之间可能有所不同。此外，高分辨率同步加速器粉末X射线衍射显示，多糖位于体外存在CAP时产生的方解石和生物方解石的晶界之间，而不是位于晶格内。

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