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首页> 外文期刊>Geosciences >Effects of Phosphorus in Growth Media on Biomineralization and Cell Surface Properties of Marine Cyanobacteria Synechococcus
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Effects of Phosphorus in Growth Media on Biomineralization and Cell Surface Properties of Marine Cyanobacteria Synechococcus

机译：生长培养基中的磷对海洋蓝藻球菌的生物矿化和细胞表面特性的影响

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Through geological time, cyanobacterial picoplankton have impacted the global carbon cycle by sequestrating CO 2 and forming authigenic carbonate minerals. Various studies have emphasized the cyanobacterial cell envelopes as nucleation sites for calcium carbonate formation. Little is known, however, about how environmental conditions (e.g., nutrient content) trigger a cell surface and its properties and, consequently, influence biomineralization. Our study aims to understand how phosphorus (P) concentration impacts the properties of cell surfaces and cell–mineral interactions. Changes to the surface properties of marine Synechococcus strains grown under various P conditions were characterized by potentiometric titrations, X-ray photoelectron spectroscopy (XPS), and tip-enhanced Raman spectroscopy (TERS). Biomineralization experiments were performed using cyanobacterial cells, which were grown under different P concentrations and exposed to solutions slightly oversaturated with respect to calcium carbonate. We observed the changes induced by different P conditions in the macromolecular composition of the cyanobacteria cell envelope and its consequences for biomineralization. The modified properties of cell surfaces were linked to carbonate precipitation rates and mineral morphology from biomineralization experiments. Our analysis shows that the increase of phosphoryl groups and surface charge, as well as the relative proportion of polysaccharides and proteins, can impact carbonate precipitation by picocyanobacteria.
机译：在整个地质时期，蓝藻微微浮游生物通过封存CO 2和形成自生碳酸盐矿物来影响全球碳循环。各种研究都将蓝藻细胞包膜作为碳酸钙形成的成核位点。然而，关于环境条件（例如营养物含量）如何触发细胞表面及其特性并因此影响生物矿化的知之甚少。我们的研究旨在了解磷（P）的浓度如何影响细胞表面的性质以及细胞与矿物质的相互作用。通过电位滴定，X射线光电子能谱（XPS）和尖端增强拉曼光谱（TERS）表征了在各种P条件下生长的海洋Synechococcus菌株表面特性的变化。使用矿物细菌细胞进行生物矿化实验，该细菌在不同的P浓度下生长，并暴露于相对于碳酸钙略微过饱和的溶液中。我们观察到由蓝细菌细胞包膜的大分子组成中不同磷条件引起的变化及其对生物矿化的影响。细胞表面的改性特性与生物矿化实验中的碳酸盐沉淀速率和矿物形态有关。我们的分析表明，磷酸基团和表面电荷的增加以及多糖和蛋白质的相对比例会影响微蓝细菌对碳酸盐的沉淀。

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