DOI: 10.1016/j.watres.2018.01.031
Scopus记录号: 2-s2.0-85041381041
论文题名: Responses of wastewater biofilms to chronic CeO2 nanoparticles exposure: Structural, physicochemical and microbial properties and potential mechanism
作者: Wang P. ; You G. ; Hou J. ; Wang C. ; Xu Y. ; Miao L. ; Feng T. ; Zhang F.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 133 起始页码: 208
结束页码: 217
语种: 英语
英文关键词: Cerium dioxide nanoparticles
; N-acylated-L-homoserine lactones
; Physicochemical and microbial properties
; Production and spatial distribution
; Stratified extracellular polymeric substances
Scopus关键词: Acylation
; Bacteria
; Biofilms
; Esters
; Nanoparticles
; Polymers
; Wastewater treatment
; Cerium dioxides
; Environmental stress
; Extra-cellular polymeric substances
; Extracellular polymeric substance (EPSs)
; Homoserine lactones
; Microbial composition
; Physicochemical and microbial properties
; Wastewater treatment plants
; Cerium compounds
; alpha dextro glucopyranose
; cerium oxide nanoparticle
; n acylhomoserine lactone
; polysaccharide
; unclassified drug
; biopolymer
; ceric oxide
; cerium
; metal nanoparticle
; biofilm
; cell
; community composition
; environmental stress
; exopolymer
; microaggregate
; microbial activity
; nanoparticle
; physicochemical property
; polysaccharide
; spatial distribution
; wastewater
; wastewater treatment
; Article
; bacterial viability
; biofilm
; controlled study
; environmental stress
; long term exposure
; macromolecule
; microbial community
; microbial diversity
; molecular weight
; nonhuman
; physical chemistry
; priority journal
; Pseudomonas
; quorum sensing
; thrombocyte aggregation
; waste water
; waste water management
; bacterial phenomena and functions
; bacterium
; biofilm
; bioreactor
; drug effect
; metabolism
; microbiology
; waste water
; Pseudomonas
; Bacteria
; Bacterial Physiological Phenomena
; Biofilms
; Biopolymers
; Bioreactors
; Cerium
; Metal Nanoparticles
; Waste Water
英文摘要: With the accelerated application of CeO2 nanoparticles (NPs), wastewater treatment plants will increasingly receive CeO2 NPs, thus inevitably causing CeO2 NPs to encounter microaggregates. Here, we comprehensively elucidate the responses in the structural, physicochemical and microbial properties of wastewater biofilms to chronic exposure (75 days) to different CeO2 NPs concentrations, with a particular emphasis on the protective mechanisms of stratified extracellular polymeric substances (EPSs). Chronic exposure to 0.1 mg/L CeO2 NPs boosted the content and broadened the distribution of α-D-glucopyranose polysaccharides (PS), while the sharply increased production and breadth of β-D-glucopyranose PS, forming a formidable shield, was a response to 10 mg/L CeO2 NPs. After the bacteria were exposed to CeO2 NPs, loosely bound EPSs (LB-EPSs) aggregated into macromolecules (increasing in apparent molecular weight (AMW)) but at a lower abundance, whereas the average AMW in tightly bound EPSs (TB-EPSs) decreased. The acetyl content and (α-helix+3-turn helix)/β-sheet value of TB-EPSs increased to resist CeO2 NPs. Furthermore, long-term exposure to CeO2 NPs decreased cell viability, reduced microbial diversity and shifted the microbial composition. N-acylated-L-homoserine lactone concentrations increased with increased density of Pseudomonas, which was associated with PS-regulated control, thus promoting PS production in EPSs in response to CeO2 NPs. These results expand the understanding of how microaggregates resist environmental stress caused by NPs. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112929
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
Recommended Citation:
Wang P.,You G.,Hou J.,et al. Responses of wastewater biofilms to chronic CeO2 nanoparticles exposure: Structural, physicochemical and microbial properties and potential mechanism[J]. Water Research,2018-01-01,133