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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Salinity-dependent diatom biosilicification implies an important role of external ionic strength
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Salinity-dependent diatom biosilicification implies an important role of external ionic strength

机译：盐度依赖的硅藻生物硅化作用暗示着外部离子强度的重要作用

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摘要

The role of external ionic strength in diatom biosilica formation was assessed by monitoring the nanostructural changes in the biosilica of the two marine diatom species Thalassiosira punctigera and Thalassiosira weissflogii that was obtained from cultures grown at two distinct salinities. Using physicochemical methods, we found that at lower salinity the specific surface area, the fractal dimensions, and the size of mesopores present in the biosilica decreased. Diatom biosilica appears to be denser at the lower salinity that was applied. This phenomenon can be explained by assuming aggregation of smaller coalescing silica particles inside the silica deposition vesicle, which would be in line with principles in silica chemistry. Apparently, external ionic strength has an important effect on diatom biosilica formation, making it tempting to propose that uptake of silicic acid and other external ions may take place simultaneously. Uptake and transport of reactants in the proximity of the expanding silica deposition vesicle, by (macro)pinocytosis, are more likely than intracellular stabilization and transport of silica precursors at the high concentrations that are necessary for the formation of the siliceous frustule components.
机译：通过监测两种海洋硅藻物种Thalassiosira punctigera和Thalassiosira weissflogii的生物硅的纳米结构变化，评估了外部离子强度在硅藻生物硅形成中的作用，这两种生物是从两种不同盐度下培养的。使用物理化学方法，我们发现在较低的盐度下，生物二氧化硅中存在的比表面积，分形维数和中孔的大小会降低。硅藻生物二氧化硅在较低的盐度下显得更致密。可以通过假设较小的聚结二氧化硅颗粒在二氧化硅沉积囊泡中聚集来解释这种现象，这符合二氧化硅化学原理。显然，外部离子强度对硅藻生物二氧化硅的形成有重要影响，因此很容易提出硅酸和其他外部离子的吸收可能同时发生。通过（宏）胞饮作用，在膨胀的二氧化硅沉积囊泡附近的反应物的吸收和运输比形成硅质壳层组分所必需的高浓度的二氧化硅前体的细胞内稳定和运输更可能。

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