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首页> 外文期刊>Chemosphere >Salinity-dependent nanostructures and composition of cell surface and its relation to Cd toxicity in an estuarine diatom
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Salinity-dependent nanostructures and composition of cell surface and its relation to Cd toxicity in an estuarine diatom

机译：盐度依赖性纳米结构和细胞表面组成及其与河口硅藻中Cd毒性的关系

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摘要

The interactions between metal and phytoplankton are affected by salinity in estuarine environments. While water chemistry is an important factor regulating the metal bioavailability in phytoplankton, the physiological adaptation of the algae cells may also change their intrinsic response to metals. In this work, we tried to interpret the salinity-dependent Cd toxicity in a pennate diatom Nitzchia closterium from a biological side. As with many studies, we observed Cd toxicity to the diatom increased with decreasing salinity. However, changing free Cd ion concentrations may be partly responsible for the enhanced Cd toxicity. Multiple evidences showed that diatom cells acclimated at low salinity had stronger intrinsic Cd adsorption capacity. Salinity significantly affected not only the nanostructures but also the biochemical composition in the cell surface of the diatom. Diatom cells grown at lower salinity had a lower surface potential, higher specific surface area, and more sulfur-containing groups in the cell wall, leading to stronger Cd binding capacity in the cells. Meanwhile, more Si was present as poly-silicic acid when the salinity decreased. The change of Si content and speciation in the cell wall are also considered a major reason for the variations of Cd surface binding. Our study provided new clues for the salinity-dependent metal toxicity in marine diatoms. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在河口环境中，盐度影响金属和浮游植物之间的相互作用。尽管水化学是调节浮游植物中金属生物利用度的重要因素，但藻类细胞的生理适应性也可能改变其对金属的内在响应。在这项工作中，我们试图从生物学的角度来解释盐度依赖的Cd毒性在戊二烯硅藻Nitzchia closterium中。与许多研究一样，我们观察到Cd对硅藻的毒性随着盐度的降低而增加。但是，改变游离Cd离子浓度可能是造成Cd毒性增强的部分原因。多种证据表明，低盐度适应的硅藻细胞具有更强的固有Cd吸附能力。盐度不仅显着影响硅藻的纳米结构，而且显着影响硅藻细胞表面的生化组成。在较低盐度下生长的硅藻细胞具有较低的表面电势，较高的比表面积和细胞壁中更多的含硫基团，从而导致细胞中更强的Cd结合能力。同时，当盐度降低时，更多的Si作为聚硅酸存在。 Si含量的变化和细胞壁中的形态也被认为是Cd表面结合变化的主要原因。我们的研究为海洋硅藻的盐度依赖性金属毒性提供了新的线索。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2019年第1期|807-814|共8页
  • 作者

    Ma Jie; Zhou Beibei; Duan Dandan; Pan Ke;

  • 作者单位

    Shenzhen Univ, Inst Adv Study, Shenzhen 518060, Peoples R China;

    Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518060, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cadmium; Marine diatom; Cell wall; Salinity; Metal adsorption;

    机译：镉;海洋硅藻;细胞壁;盐度;金属吸附;

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