小型多环芳香碳化合物集群对微生物的高毒性和高风险影响,与大集群相比
Shuyue Zheng1, Jihong Dong1, Quan Chen1
1Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan China.
Environmental science & technology
|December 26, 2024
概括
较小的多环芳 (PAH) 集群比较大的集群具有更大的微生物毒性. 这项研究突显了PAH在水生环境中聚合的被忽视的生态风险.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 毒理学 毒理学 毒理学
背景情况:
- 多环芳 (PAH) 是普遍存在的环境污染物.
- PAH自我聚类对生态风险评估产生影响,但研究不足.
- 微生物中PAHs的积累对生态构成重大威胁.
研究的目的:
- 评估不同多环芳 (PAH) 集群大小对微生物的毒性影响.
- 为了比较较小的和较大的PAH集群的毒性.
- 为了阐明PAH在细菌中集群毒性的基础机制.
主要方法:
- 研究了水生环境中PAH集群的形成和特征.
- 使用单细胞拉曼光谱法与D2O标记,以链接细菌表型和转录组学.
- 量化微生物代谢活性,细胞内活性氧物种 (ROS) 和基因表达.
主要成果:
- 超过95%的PAH在水中形成集群;较小的集群在较低度和较少环数时更受欢迎.
- 暴露于较小的PAH集群减少了1-10%的细菌代谢活动,并增加了1.8-2.9倍的细胞内ROS.
- 在较小的PAH集群暴露下,ROS反应和排泄的基因表达分别上调至6.33倍和4.97倍.
结论:
- 较小的PAH集群对微生物的毒性比较大,对微生物的毒性更大.
- 在环境系统中,PAH聚类代表着一个重要的,被低估的生态风险.
- 这些发现有助于更好地了解PAHs的环境命运和生态毒性.
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