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Antimicrobial efficacy and mechanisms of silver nanoparticles against Phanerochaete chrysosporium in the presence of common electrolytes and humic acid

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Journal of hazardous materials 2020年 383卷 121153页

作者： Zhenzhen Huang Zhuotong Zeng Zhongxian Song Anwei Chen Guangming Zeng Rong Xiao Kai He Lei Yuan Hui Li Guiqiu Chen College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 China. Department of Dermatology Second Xiangya Hospital Central South University Changsha 410011 China. Faculty of Environmental and Municipal Engineering Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology Henan University of Urban Construction Pingdingshan 467036 China. College of Resources and Environment Hunan Agricultural University Changsha 410128 China. College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 China. Electronic address: zgming@***. Department of Dermatology Second Xiangya Hospital Central South University Changsha 410011 China. Electronic address: xiaorong65@***.

In this study, influences of cations (Na, K, Ca, and Mg), anions (NO, Cl, and SO), and humic acid (HA) on the antimicrobial efficacy of silver nanoparticles (AgNPs)/Ag against Phanerochaete chrysosporium were investigated by observing cell viability and total Ag uptake. K enhanced the antimicrobial toxicity of AgNPs on P. chrysosporium, while divalent cations decreased the toxicity considerably, with preference of Ca over Mg. Impact caused by a combination of monovalent and divalent electrolytes was mainly controlled by divalent cations. Compared to AgNPs, however, Ag with the same total Ag content exhibited stronger antimicrobial efficacy towards P. chrysosporium, regardless of the type of electrolytes. Furthermore, HA addition induced greater microbial activity under AgNP stress, possibly originating from stronger affinity of AgNPs over Ag to organic matters. The obtained results suggested that antimicrobial efficacy of AgNPs was closely related to water chemistry: addition of divalent electrolytes and HA reduced the opportunities directly for AgNP contact and interaction with cells through formation of aggregates, complexes, and surface coatings, leading to significant toxicity reduction; however, in monovalent electrolytes, the dominating mode of action of AgNPs could be toxic effects of the released Ag on microorganisms due to nanoparticle dissolution.

关键词： Antimicrobial efficacy Humic acid Monovalent and divalent electrolytes Phanerochaete chrysosprium Silver nanoparticles

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The study of migration velocity of Cs-135 and Se-79 in intact rock

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IOP Conference Series: Materials Science and Engineering 2019年第1期592卷

作者： H Ling L Chen W M Chen L Yun Beijing Research Institute of Uranium Geology CNNC Beijing 100029 China Hunan Provincial Key Laboratory of Pollution Control and Resources Technology University of South China Hengyang 421001 China

The migration characteristics of highly mobile nuclides in natural barrier are the key concerns in the long-term safety assessment of geological disposal facilities. This paper focused on typical granite in Beishan area for geological disposal of high-level radioactive waste, and established a computational model for the release and migrate of nuclides after closure of repository by GoldSim. The migration characteristics of Cs-135 and Se-79 were analyzed by Monte Carlo stochastic simulation. The results show that the migration characteristics of Cs-135 and Se-79 in intact rock are direct influenced by hydraulic conductivity and hydraulic gradient, the migration velocity are 2.47×10-4m/a and 9.61×10-4m/a when the hydraulic conductivity correspond to 5.74 ×10-9 m/s. The analysis of the results shows that the migration characteristics can provide feedback guidance for the site selection and design of the disposal repository.

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Cl2⋅−Mediates Direct and Selective Conversion of Inert C(sp3)−H Bonds into Aldehydes/Ketones

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Angewandte Chemie 2023年第36期135卷

作者： Dr. Qinhua Zhang Dr. Bo An Dr. Yu Lei Zhixiao Gao Dr. Haonan Zhang Prof. Sheng Xue Prof. Xin Jin Prof. Wengang Xu Zihan Wu Prof. Mingbo Wu Prof. Xin Yang Prof. Wenting Wu State Key Laboratory of Heavy Oil Processing Institute of New Energy College of Chemical Engineering China University of Petroleum (East China) Qingdao 266580 P. R. China Contribution: Data curation (lead) Investigation (lead) Methodology (lead) Software (lead) Writing - original draft (lead) Contribution: Data curation (supporting) Software (supporting) Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 China Contribution: Data curation (supporting) Investigation (supporting) Contribution: Resources (supporting) Software (supporting) Contribution: Data curation (supporting) Validation (supporting) Institute for Translational Medicine The Affiliated Hospital of Qingdao University College of Medicine Qingdao University Qingdao 266021 P. R. China Contribution: Conceptualization (supporting) Resources (supporting) Contribution: Formal analysis (supporting) Resources (supporting) Contribution: Investigation (supporting) Methodology (supporting) Contribution: Data curation (supporting) Contribution: Funding acquisition (lead) Project administration (lead) Supervision (lead) Writing - review & editing (lead) Contribution: Investigation (equal) Methodology (equal) Writing - review & editing (equal) Contribution: Formal analysis (lead) Project administration (lead) Supervision (lead) Writing - review & editing (lead)

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Antioxidative response of Phanerochaete chrysosporium against silver nanoparticle-induced toxicity and its potential mechanism

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Chemosphere 2018年 211卷 573-583页

作者： Zhenzhen Huang Kai He Zhongxian Song Guangming Zeng Anwei Chen Lei Yuan Hui Li Liang Hu Zhi Guo Guiqiu Chen College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China. Faculty of Environmental and Municipal Engineering Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology Henan University of Urban Construction Pingdingshan 467036 PR China. College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China. Electronic address: zgming@***. College of Resources and Environment Hunan Agricultural University Changsha 410128 PR China. Electronic address: A.Chen@***.

Antioxidative response of Phanerochaete chrysosporium induced by silver nanoparticles (AgNPs) and their toxicity mechanisms were comprehensively investigated in a complex system with 2,4-dichlorophenol (2,4-DCP) and Ag. Malondialdehyde content was elevated by 2,4-DCP, AgNPs, and/or Ag in concentration- and time-dependent manners within 24 h, indicating an increase in lipid peroxidation. However, beyond 48 h of exposure, lipid peroxidation was alleviated by upregulation of intracellular protein production and enhancement in the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD). Comparatively, POD played more major roles in cell protection against oxidative damage. Furthermore, the dynamic change in reactive oxygen species (ROS) level was parallel to that of oxidized glutathione (GSSG), and ROS levels correlated well with GSSG contents (R = 0.953) after exposure to AgNPs for 24 h. This finding suggested that elimination of oxidative stress resulted in depletion of reduced glutathione. Coupled with the analyses of anoxidative responses of P. chrysosporium under the single and combined treatments of AgNPs and Ag, HAADF-STEM, SEM, and EDX demonstrated that AgNP-induced cytotoxicity could originate from the original AgNPs, rather than dissolved Ag or the biosynthesized AgNPs.

关键词： Antioxidative enzymes Oxidative stress Phanerochaete chrysosporium Silver nanoparticles “Particle-specific” effects

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Multivariate relationships between microbial communities and environmental variables during co-composting of sewage sludge and agricultural waste in the presence of PVP-AgNPs

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Bioresource technology 2018年 261卷 10-18页

作者： Lihua Zhang Jiachao Zhang Guangming Zeng Haoran Dong Yaoning Chen Chao Huang Yuan Zhu Rui Xu Yujun Cheng Kunjie Hou Weicheng Cao Wei Fang College of Environmental Science and Engineering Hunan University Changsha 410082 PR China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha 410082 PR China. College of Resources and Environment Hunan Agricultural University Changsha 410082 PR China. Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha 410082 PR China. Electronic address: zgming@***. College of Environmental Science and Engineering Central South University of Forestry and Technology Changsha 410004 PR China.

This study evaluated the contributions of environmental variables to the variations in bacterial 16S rDNA, nitrifying and denitrifying genes abundances during composting in the presence of polyvinylpyrrolidone coated silver nanoparticles (PVP-AgNPs). Manual forward selection in redundancy analysis (RDA) indicated that the variation in 16S rDNA was significantly explained by NO-N, while nitrifying genes were significantly related with pH, and denitrifying genes were driven by NO-N and TN. Partial RDA further revealed that NO-N solely explained 28.8% of the variation in 16S rDNA abundance, and pH accounted for 61.8% of the variation in nitrifying genes. NO-N and TN accounted for 34.2% and 9.2% of denitrifying genes variation, respectively. The RDA triplots showed that different genes shared different relationships with environmental parameters. Based on these findings, a composting with high efficiency and quality may be conducted in the future work by adjusting the significant environmental variables.

关键词： 16S rDNA Co-composting Nitrogen functional genes PVP-AgNPs Redundancy analysis

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Toxicity of environmental nanosilver: mechanism and assessment

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Environmental Chemistry Letters 2018年第1期17卷 319-333页

作者： Zhi Guo Guangming Zeng Kangping Cui Anwei Chen School of Resources and Environmental Engineering Hefei University of Technology Hefei People’s Republic of China College of Environmental Science and Engineering Hunan University Changsha People’s Republic of China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha People’s Republic of China College of Resources and Environment Hunan Agricultural University Changsha People’s Republic of China

Nanosilver (nAg) is increasingly being used in a wide array of fields, and its toxicity has been extensively studied. Here we present a review of environmental nAg cytotoxicity, as well toxicity mechanisms. The cytotoxicity is described in four aspects including cell membrane, the genome, the mitochondria and autophagy flux. Considering its broad-spectrum antibiotic effects, nAg ecotoxicity is described, in addition to an analysis of factors necessary in controlling its toxicity. We propose a toxicity assessment model with potential applications to living organisms, based on the antibacterial effects of nAg.

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Ecological vulnerability assessment of Minjiang River in the Yangtze River Basin, China 6th

Ecological vulnerability assessment of Minjiang River in the...

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6th International Conference on Risk Analysis and Crisis Response, RACR 2017

作者： Wang, Yuankun Wang, Dong Sheng, Dong State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing China Department of Hydro-Sciences School of Earth Sciences and Engineering Nanjing China Hunan Water Resources and Hydropower Research Institute Changsha China

ISBN: (纸本)9781138033597

A new assessment model for river ecological vulnerability is developed based on the Variable Fuzzy Theory on the basis of river eco-environment characteristics. The model is applied to assess ecological vulnerability of Minjiang River in the Yangtze River Basin, China. Results show that the proposed model rationally determines ecological vulner-ability level. We hope this study could provide a scientific reference for environment manage-ment in Yangtze River Basin. © 2017 Taylor & Francis Group, London.

关键词： Rivers

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Toxicity effects of silver nanoparticles on the freshwater bivalve Corbicula fluminea

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Journal of Environmental Chemical Engineering 2018年第4期6卷 4236-4244页

作者： Weiwei Liu Zhuotong Zeng Anwei Chen Guangming Zeng Rong Xiao Zhi Guo Feng Yi Zhenzhen Huang Kai He Liang Hu College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China Department of Dermatology Second Xiangya Hospital Central South University Changsha 410011 PR China College of Resources and Environment Hunan Agricultural University Changsha 410128 PR China School of Resources and Environmental Engineering Hefei University of Technology Hefei 230001 PR China

Toxicity effects of silver nanoparticles (AgNPs) on the freshwater bivalve Corbicula fluminea ( C. fluminea ) were investigated through experiments. In this study, C. fluminea promoted the sedimentation of AgNPs and affected the fate and transformation of AgNPs. A series of biomarkers of C. fluminea in vivo were evaluated after 14 days exposure to various doses (0–2 mg L −1 ) of polyvinyl pyrrolidone (PVP) coated AgNPs. The levels of antioxidants increased obviously in 2 mg L −1 AgNPs treatments to protect C. fluminea from oxidative damage. Glutathione peroxidase (GPx) and glutathione (GSH) played important roles in tissues detoxification in 0.1 and 0.5 mg L −1 exposure, respectively. The biological behaviors (feeding rate, ammonia excretion rate) were inhibited at 0.1 mg L −1 , inducted at 0.5 mg L −1 , and inhibited again at 2 mg L -1 AgNPs, which indicated that AgNPs influenced the physiological metabolism of C. fluminea . Ag contents in tissue and shell of C. fluminea were much higher than blank groups. In addition, in vivo tissues were more sensitive to low AgNPs concentration compared with shells, indicating that C. fluminea could be used as a good indicator for AgNPs freshwater pollution. No Ag was detected in feces probably implying that nanoparticles had long gut retention time in C. fluminea . Overall, this study reveals the interactions between AgNPs and C. fluminea and provides important implications about the fate and toxicity of AgNPs in natural aquatic environment.

关键词： Silver nanoparticles Corbicula fluminea Fate Antioxidants Behaviors

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Retracted Article: Influence of aqueous sulfide on speciation of U(vi) adsorbed to nanomagnetite

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Environmental Science: Nano 2018年第8期5卷 1981-1989页

作者： Yubing Sun Jianhui Lan Mengxue Li Wei Hu Haibo Liu Gang Song Diyun Chen Weiqun Shi Xiangke Wang College of Environmental Science and Engineering North China Electric Power University Beijing 102206 P. R. China Laboratory of Nuclear Energy Chemistry and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences Beijing China School of Resources and Environmental Engineering Hefei University of Technology Hefei P. R. China Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources Guangzhou 510006 China

Heterogeneous reduction of U(VI) by structural Fe2+ and S2− is a key process influencing its fate and transport in subsurface environment. In this study, the adsorption of U(VI) on nanomagnetite was primarily conducte...

Heterogeneous reduction of U(VI) by structural Fe²⁺ and S²⁻ is a key process influencing its fate and transport in subsurface environment. In this study, the adsorption of U(VI) on nanomagnetite was primarily conducted and then, it was desorbed by adding S²⁻. The desorption of absorbed U(VI) significantly increased with the increase in S²⁻, whereas S²⁻ consumption was higher than the desorbed amount of U(VI) due to the volatilization (H₂S) and sulfidization (FeS) at low and high pH, respectively. The XRD analysis demonstrated that the main components of corrosion products for nanomagnetite after adding S²⁻ at pH 3.0 and 7.0 are lepidocrocite and mackinawite, respectively, after a reaction time of 128 days. According to analyses of ITFA and XANES spectra, the main speciation of uranium at pH 3.0 and 7.0 were U(V) and U(IV) species, respectively. The required energy of U(V) desorbed from lepidocrocite (−12.78 kcal mol⁻¹) at pH 3.0 after 128 days was higher than that of U(IV) (−26.16 kcal mol⁻¹) by theoretical calculations, indicating that U(V) can be stably incorporated into the secondary phase. These findings are crucial for understanding the speciation of uranium at low pH and reducing conditions.

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Silver nanomaterials in the natural environment: An overview of their biosynthesis and kinetic behavior

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The Science of the total environment 2018年 643卷 1325-1336页

作者： Zhi Guo Kangping Cui Guangming Zeng Jiajia Wang Xingpan Guo School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 PR China. Electronic address: guozhi@***. School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 PR China. College of Environmental Science and Engineering Hunan University Changsha 410082 PR China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China. Key Laboratory of Geographic Information Science (Ministry of Education) School of Geographical Sciences East China Normal University 500 Dongchuan Road Shanghai 200241 China.

Silver nanomaterials (Ag NMs) are fabricated by many biological components in our environment. Recently, research on their biosynthesis and reactions has become a focus of attention. Due to the complexity of biological systems and samples, specific processes and mechanisms involving Ag NMs are difficult to identify and elucidate on the molecular and chemical-bond level. The microorganisms and composite components of plant extracts are of great interest in many biological syntheses. Although potential biomolecules have been shown to play essential roles in biological systems in Ag NM biosynthesis, the detailed mechanism of the electron transfer process and crucial molecules that control this reaction have only recently come into focus. The reactive behavior of the Ag NMs is of great significance for understanding their overall behavior and toxicity. Additionally, only limited knowledge is available about their kinetics. All reactions involve chemical bond formation, electron transfer, or electrostatic interactions. An overview is presented of the biosynthesis of Ag NMs based on molecular supports including a nitrate reductase/NADH oxidase-involved electron transfer reaction and their mechanisms in Ag reduction: quinol-mediated mechanism and superoxide-dependent mechanism, and molecular supports in plant extracts, is presented. The environmental reaction kinetics and mechanisms of the interactions of Ag NMs with substances are introduced based on the formation and classification of chemical bonds. The particle-particle reaction kinetics of Ag NMs in the environment are discussed to directly explain their stability and aggregation behavior. The toxicity of Ag NMs is also presented. In addition, future prospects are summarized. This review is the first to provide an insight into the mediating molecules and chemical bonds involved in the biosynthesis, kinetics, and mechanisms of action of Ag NMs.

关键词： Biosynthesis Kinetics Mechanism Reaction Silver nanomaterials

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