细胞外聚合物质对生物膜中的生物积累和生物转化的影响
Donghua Qiu1, Ziyue Yu1, Xin Zhang1
1Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Chemosphere
|November 30, 2023
概括
生物膜中的细胞外聚合物 (EPS) 对 (As) 的去除至关重要,对其在水环境中的吸附和转化产生重大影响.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 水质研究 水质研究
背景情况:
- 已知生物膜可以生物吸收和生物转化重金属.
- 细胞外聚合物物质 (EPS) 在 (As) 生物积累和生物膜内的转化中的特定作用仍然在很大程度上未知.
研究的目的:
- 研究EPS对无机 (As) 在生物膜中的生物积累和物种化的影响.
- 阐明水生环境中As与EPS相互作用的机制.
主要方法:
- 在含有EPS和没有EPS的生物膜中对As的积累和物种化的比较分析.
- 里埃变换红外光谱法 (FTIR) 用于评估功能组与As的相互作用.
- 测量As的吸收,吸附和物种化在生物膜和生长介质在As (V) 和As (III) 暴露下.
主要成果:
- 移除EPS显著降低了As的吸收和吸附在生物膜中,无论是As (V) 还是As (III).
- EPS促进了较少有毒的As ((V) 的吸附,而没有EPS的生物膜吸附了更有毒的As ((III)).
- 移除EPS抑制了As(III) 的氧化和甲基化,改变了生长介质中的As分化.
结论:
- 细胞外聚合物物质 (EPS) 在生物膜中的生物吸收和生物转化中发挥着至关重要的作用.
- 生物膜,特别是它们的EPS成分,对于的生物地球化学循环和水净化至关重要.
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