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首页> 外文期刊>Environmental Science & Technology >Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments
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Cyanobacteria-Mediated Arsenic Redox Dynamics Is Regulated by Phosphate in Aquatic Environments

机译：蓝藻介导的砷氧化还原动力学受水生环境中磷酸盐的调节。

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摘要

Studies of cyanobacteria in environments where arsenic (As) and phosphate (P) both occur in significant concentrations have so far only focused on the effect of P on As(Ⅴ) toxicity and bioaccumulation, with little attention to the influence of P on As redox transformations. Our study revealed that As(Ⅲ) oxidation by Synechocystis appeared to be more effective with increased P levels. We demonstrated that the higher As(Ⅲ) percentage in the medium under P-limited conditions was due to enhanced As(Ⅴ) uptake and the subsequent efflux of intracellularly reduced As(Ⅲ) which in turn contributed to higher As(Ⅲ) concentrations in the medium. Arsenic redox changes by Synechocystis under P-limited conditions is a dynamic cyclic process that includes the following: surface As(Ⅲ) oxidation (either in the periplasm or near the outer membrane), As(Ⅴ) uptake, intracellular As(Ⅴ) reduction, and As(Ⅲ) efflux. These observations not only expand our understanding of how P influences microbial As redox metabolisms but also provide insights into the biogeochemical coupling between As and P in As contaminated eutrophic aquatic environments and artificial wetland-paddy fields.
机译：迄今为止，砷（As）和磷酸盐（P）均以高浓度存在的环境中的蓝细菌研究仅集中于P对As（Ⅴ）毒性和生物累积的影响，而很少关注P对As氧化还原的影响转变。我们的研究表明，随着P含量的增加，集囊藻的As（Ⅲ）氧化似乎更有效。我们证明了在P限制条件下培养基中较高的As（Ⅲ）百分比是由于提高了As（Ⅴ）的吸收以及随后细胞内还原As（Ⅲ）的流出，进而导致较高的As（Ⅲ）浓度。媒介。磷限制条件下集胞藻引起的砷氧化还原变化是一个动态循环过程，包括以下过程：表面As（Ⅲ）氧化（在周质中或在外膜附近），As（Ⅴ）吸收，细胞内As（Ⅴ）还原和As（Ⅲ）外排。这些观察结果不仅扩展了我们对磷如何影响微生物As氧化还原代谢的理解，而且还提供了对As富营养化水生环境和人工湿地稻田中As和P之间生物地球化学耦合的见解。

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  • 来源
    《Environmental Science & Technology》 |2014年第2期|994-1000|共7页
  • 作者

    Siyu Zhang; Christopher Rensing; Yong-Guan Zhu;

  • 作者单位

    State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China;

    Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China,Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021 Fujian, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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