How Microbial Aggregates Protect against Nanoparticle Toxicity

Tang, Jun; Wu, Yonghong; Esquivel-Elizondo, Sofia; Sørensen, Søren J.; Rittmann, Bruce E.

doi:10.1016/j.tibtech.2018.06.009

Cited by 140 publications

(48 citation statements)

References 87 publications

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“…In addition, the algae in periphyton will have the adaption time at the beginning, so the decrease was also observed in the control, which was also observed in the previous study [25]. After the adaption of periphyton, the algae will regenerate with the reduction of Cu 2+ and its toxic effects, therefore the photoautotrophs can resume and the total Chla concentration can increase [19,23]. However, after 144 h incubation, the concentration of total Chla in the 2 mg/L Cu 2+ treatment was obviously lower than the control and 0.5 mg/L Cu 2+ , indicating the obvious inhibition of 2 mg/L Cu 2+ on periphyton biomass.…”

Section: Effect Of Cu 2+ On Microbial Growth Of Periphytonsupporting

confidence: 68%

“…Recently, periphytic biofilms have become a common biological treatment form in water and/or wastewater disposal, and work efficiently in dealing with nutrient removal and several containments such as organic matters, nanoparticles and heavy metals [16][17][18][19]. Compared with single-species communities for biological treatment, multi-species periphyton have stronger pollution load capacity and anti-interference ability [9,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the efficiency of commonly accepted single-species communities for pollution treatment could be easily influenced by the complex wastewater components, such as organic pollutants and heavy metals [9]. Periphyton has been demonstrated to exhibit more resistance to environmental disturbances through self-controlling the community structure and microbial activity [14,19]. However, it still needs to be verified whether periphyton can maintain the normal removal efficiency for sewage and wastewater when dealing with the influence of complex components, such as high heavy metal content water.…”

Section: Introductionmentioning

confidence: 99%

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Responses of Periphyton Microbial Growth, Activity, and Pollutant Removal Efficiency to Cu Exposure

Zhong

Zhao²,

Song³

2020

IJERPH

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Periphyton is an effective matrix for the removal of pollutants in wastewater and has been considered a promising method of bioremediation. However, it still needs to be verified whether periphyton can maintain microbial activity and pollutant removal efficiency when dealing with the influence with complex components, and the underlying mechanisms of periphyton need to be revealed further. Herein, this study investigated the microbial growth, activity and functional responses of periphyton after removal of Cu from wastewater. Results showed that the cultivated periphyton was dominated by filamentous algae, and high Cu removal efficiencies by periphyton were obtained after 108 h treatments. Although 2 mg/L Cu2+ changed the microalgal growth (decreasing the contents of total chlorophyll-a (Chla), the carbon source utilization and microbial metabolic activity in periphyton were not significantly affected and even increased by 2 mg/L Cu2+. Moreover, chemical oxygen demand (COD) removal rates were sustained after 0.5 and 2 mg/L Cu2+ treatments. Our work showed that periphyton had strong tolerance and resistance on Cu stress and is environmentally friendly in dealing with wastewater containing heavy metals, as the microbial functions in pollutant removal could be maintained.

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Section: Effect Of Cu 2+ On Microbial Growth Of Periphytonsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Responses of Periphyton Microbial Growth, Activity, and Pollutant Removal Efficiency to Cu Exposure

Zhong

Zhao²,

Song³

2020

IJERPH

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“…Ecologically, the high protein content in EPS could contribute to protecting microbes in periphytic biofilm against adverse growth conditions such as water stress, heavy metals, pesticides, and insecticides [4,33,34]. In the present study, we found two new ecological function of EPS in periphytic biofilm, for the first one of EPS assisting N and P accumulation by periphytic biofilm, this is because EPS has abundant functional groups such as carboxyl, carbonyl, etc.…”

Section: Discussionsupporting

confidence: 49%

Physical geography shapes the distribution characteristics of extracellular polymeric substances in periphytic biofilms

Sun¹,

Xu²,

Wang³

et al. 2020

Preprint

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Background: Extracellular polymeric substances (EPS) are the glue that holds periphytic biofilms together. However, little is known about the chemical composition of the EPS and whether and if so how these components vary over different geographic regions. Therefore, we collected a large series of periphytic biofilms from paddy fields in different geographic regions to study the content, geographical distribution, and potential ecological function of EPS in periphytic biofilms, as well as the function of microbial components on EPS in periphytic biofilm.Results: EPS accounted for 1.3-2.9% of the total biomass of periphytic biofilms, while the protein content in periphytic biofilm was 1.8 to 20 times higher than that of the polysaccharides. The geographical distribution of EPS in periphytic biofilms follows the typical latitudinal diversity gradient theory: EPS contents decreased with increasing latitudes, but the ratio of protein to polysaccharide in periphytic biofilms showed the opposite trend. Physical geography characteristics, including temperature and light, are the principal forces driving the geographical distribution of EPS in periphytic biofilms, affecting their microbial composition. Prokaryotes in periphytic biofilm negatively affect the EPS content in periphytic biofilm, suggesting that prokaryotes may function as EPS consumers, while eukaryotes may be EPS producers, because they positively affect the EPS content in periphytic biofilm. Functionally, EPS components contribute to N and P accumulation in periphytic biofilms, as well as enhance the total organic carbon content in periphytic biofilm.Conclusion: These analyses provide invaluable information on the biogeochemistry of EPS in periphytic biofilms and their potential role in modulating nutrient cycles in paddy fields.

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“…Outside the metal‐reducing bacteria, metal ions [ 120 ] and metal nanoparticles are well‐known to have a strong inhibitory effect on planktonic cells and biofilms, [ 159 ] although the formation of biofilms and aggregates contributes to reduced metal and nanoparticle toxicity with respect to their planktonic counterpart. [ 160 ]…”

Section: Microbial Synthesis Of Metal Nanoparticles In Biofilmsmentioning

confidence: 99%

Metal Nanoparticle–Microbe Interactions: Synthesis and Antimicrobial Effects

Khan

Fromm

Rizvi

et al. 2020

Part & Part Syst Charact

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metal solution, reduction of the metal ions leads to the generation of metal atom clustering generating nanosized particles. A characteristic of biosynthetic NPs is their high stability as the organisms provide their own biomolecular capping agent(s). [1] While plant-based production of NPs is now considered a scientific curiosity rather than a promising biotechnology, [2] bacteriamediated NP biosynthesis offers better chances, in light of the poorly characterized microbial diversity and the complex chemistry of enzymes in metal-reducing bacteria. Two recent works focused on directed biofabrication of CdSe-nanoparticles through regulating extracellular electron transfer [3] and the biosynthesis of highly active copper NPs (CuNP) by Shewanella oneidensis. [4] However, the description of molecular mechanism(s) involved in the biosynthesis of NPs has received little attention, which is the focus of this review.The CFCF or culture supernatants (CS) of bacteria mediate the synthesis of AgNPs [5] as presented in this section. The CFCF from the family Enterobacteriaceae reduce silver ions to AgNPs ( Table 1). CFCF of Klebsiella pneumoniae, Escherichia coli, and Metal nanoparticles (NPs), chalcogenides, and carbon quantum dots can be easily synthesized from whole microorganisms (fungi and bacteria) and cell-free sterile filtered spent medium. The particle size distribution and the biosynthesis time can be somewhat controlled through the biomass/metal solution ratio. The biosynthetic mechanism can be explained through the ionreduction theory and UV photoconversion theory. Formation of biosynthetic NPs is part of the detoxification strategy employed by microorganisms, either in planktonic or biofilm form, to reduce the chemical toxicity of metal ions. In fact, most reports on NP biosynthesis show extracellular metal ion reduction. This is important for environmental and industrial applications, particularly in biofilms, as it allows in principle high biosynthetic rates. The antimicrobial and antifungal effect on biosynthetic NPs can be explained in terms of reactive oxygen species and can be enhanced by the capping agents attached to the NP during the biosynthesis process. Industrial applications of NP biosynthesis are still lagging, due to the difficulty of controlling NP size and low titer. Further, the environmental assessment of biosynthetic NPs has not yet been carried out. It is expected that further advancements in biosynthetic NP research will lead to applications, particularly in environmental biotechnology.

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How Microbial Aggregates Protect against Nanoparticle Toxicity

Cited by 140 publications

References 87 publications

Responses of Periphyton Microbial Growth, Activity, and Pollutant Removal Efficiency to Cu Exposure

Responses of Periphyton Microbial Growth, Activity, and Pollutant Removal Efficiency to Cu Exposure

Physical geography shapes the distribution characteristics of extracellular polymeric substances in periphytic biofilms

Metal Nanoparticle–Microbe Interactions: Synthesis and Antimicrobial Effects

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