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Mechanistic and microbial ecological insights into the impacts of micro- and nano- plastics on microbial reductive dehalogenation of organohalide pollutants.
Liu, Jinting; Xu, Guofang; Zhao, Siyan; Chen, Chen; Rogers, Matthew J; He, Jianzhong.
Afiliação
  • Liu J; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore.
  • Xu G; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore; NUS Graduate School - Integrative Sciences and Engineering Programme (ISEP), National University of Singapore, 119077, Singapore.
  • Zhao S; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore.
  • Chen C; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore.
  • Rogers MJ; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore.
  • He J; Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore. Electronic address: jianzhong.he@nus.edu.sg.
J Hazard Mater ; 448: 130895, 2023 04 15.
Article em En | MEDLINE | ID: mdl-36758435
Micro- and nano-plastics are prevalent in diverse ecosystems, but their impacts on biotransformation of organohalide pollutants and underpinning microbial communities remain poorly understood. Here we investigated the influence of micro- and nano-plastics on microbial reductive dehalogenation at strain and community levels. Generally, microplastics including polyethylene (PE), polystyrene (PS), polylactic acid (PLA), and a weathered microplastic mixture increased dehalogenation rate by 10 - 217% in both the Dehalococcoides isolate and enrichment culture, whereas the effects of polyvinyl chloride (PVC) and a defined microplastic mixture depended on their concentrations and cultures. Contrarily, nano-PS (80 nm) consistently inhibited dehalogenation due to increased production of reactive oxygen species. Nevertheless, the enrichment culture showed higher tolerance to nano-PS inhibition, implying crucial roles of non-dehalogenating populations in ameliorating nanoplastic inhibition. The variation in dehalogenation activity was linked to altered organohalide-respiring bacteria (OHRB) growth and reductive dehalogenase (RDase) gene transcription. Moreover, microplastics changed the community structure and benefited the enrichment of OHRB, favoring the proliferation of Dehalogenimonas. More broadly, the assembly of microbial communities on plastic biofilms was more deterministic than that in the planktonic cells, with more complex co-occurrence networks in the former. Collectively, these findings contribute to better understanding the fate of organohalides in changing environments with increasing plastic pollution.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Ambientais Idioma: En Revista: J Hazard Mater Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Singapura País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Ambientais Idioma: En Revista: J Hazard Mater Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Singapura País de publicação: Holanda