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Islam MS, Zhu J, Xiao L, Khan ZH, Saqib HSA, Gao M, Song Z. Enhancing rice quality and productivity: Multifunctional biochar for arsenic, cadmium, and bacterial control in paddy soil. CHEMOSPHERE 2023; 342:140157. [PMID: 37716553 DOI: 10.1016/j.chemosphere.2023.140157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 09/05/2023] [Accepted: 09/11/2023] [Indexed: 09/18/2023]
Abstract
The perilousness of arsenic and cadmium (As-Cd) toxicity in water and soil presents a substantial hazard to the ecosystem and human well-being. Additionally, this metal (loids) (MLs) can have a deleterious effect on rice quality and yield, owing to the existence of toxic stress. In response to the pressing concern of reducing the MLs accumulation in rice grain, this study has prepared magnesium-manganese-modified corn-stover biochar (MMCB), magnesium-manganese-modified eggshell char (MMEB), and a combination of both (MMCEB). To test the effectiveness of these amendments, several pot trials were conducted, utilizing 1% and 2% application rates. The research discovered that the MMEB followed by MMCEB treatment at a 2% rate yielded the most significant paddy and rice quality, compared to the untreated control (CON) and MMCB. MMEB and MMCEB also extensively decreased the MLs content in the grain than CON, thereby demonstrating the potential to enrich food security and human healthiness. In addition, MMEB and MMCEB augmented the microbial community configuration in the paddy soil, including As-Cd detoxifying bacteria, and decreased bioavailable form of the MLs in the soil compared to the CON. The amendments also augmented Fe/Mn-plaque which captured a considerable quantity of As-Cd in comparison to the CON. In conclusion, the utilization of multifunctional biochar, such as MMEB and MMCEB, is an encouraging approach to diminish MLs aggregation in rice grain and increase rice yield for the reparation of paddy soils via transforming microbiota especially enhancing As-Cd detoxifying taxa, thereby improving agroecology, food security, and human and animal health.
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Affiliation(s)
- Md Shafiqul Islam
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China
| | - Junhua Zhu
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China
| | - Ling Xiao
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China
| | - Zulqarnain Haider Khan
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China
| | - Hafiz Sohaib Ahmed Saqib
- Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, 515063, China
| | - Minling Gao
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China.
| | - Zhengguo Song
- Department of Chemistry and Chemical Engineering, Shantou University, Shantou, 515063, China.
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2
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Brito EMS, Guyoneaud R, Caretta CA, Joseph M, Goñi-Urriza M, Ollivier B, Hirschler-Réa A. Bacterial diversity of an acid mine drainage beside the Xichú River (Mexico) accessed by culture-dependent and culture-independent approaches. Extremophiles 2023; 27:5. [PMID: 36800123 DOI: 10.1007/s00792-023-01291-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 02/02/2023] [Indexed: 02/18/2023]
Abstract
Xichú River is a Mexican river located in an environmental preservation area called Sierra Gorda Biosphere Reserve. Around it, there are tons of abandoned mine residues that represent a serious environmental issue. Sediment samples of Xichú River, visibly contaminated by flows of an acid mine drainage, were collected to study their prokaryotic diversity. The study was based on both cultural and non-cultural approaches. The analysis of total 16S rRNA gene by MiSEQ sequencing allowed to identify 182 Operational Taxonomic Units. The community was dominated by Pseudomonadota, Bacteroidota, "Desulfobacterota" and Acidobacteriota (27, 21, 19 and 16%, respectively). Different culture conditions were used focusing on the isolation of anaerobic bacteria, including sulfate-reducing bacteria (SRB) and arsenate-reducing bacteria (ARB). Finally, 16 strains were isolated. Among them, 12 were phylogenetically identified, with two strains being SRB, belonging to the genus Solidesulfovibrio ("Desulfobacterota"), while ten are ARB belonging to the genera Azospira (Pseudomonadota), Peribacillus (Bacillota), Raineyella and Propionicimonas (Actinomycetota). The isolate representative of Raineyella genus probably corresponds to a new species, which, besides arsenate, also reduces nitrate, nitrite, and fumarate.
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Affiliation(s)
- Elcia Margareth Souza Brito
- Environmental Engineering Department, Laboratory of Environmental Microbiology and Applied Molecular Biology, DI-CGT, Universidad de Guanajuato, CP 36000, Guanajuato (Gto.), Mexico
| | - Rémy Guyoneaud
- UMR 5254, Environmental Microbiology Group, E2S-UPPA CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | - César Augusto Caretta
- Astronomy Department, Universidad de Guanajuato, DCNE-CGT, CP 36023, Guanajuato (Gto.), Mexico.
| | - Manon Joseph
- UM 110, CNRS, IRD, Aix Marseille Université, Institut Méditerranéen d'Océanologie (MIO), Marseille, France
| | - Marisol Goñi-Urriza
- UMR 5254, Environmental Microbiology Group, E2S-UPPA CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | - Bernard Ollivier
- UM 110, CNRS, IRD, Aix Marseille Université, Institut Méditerranéen d'Océanologie (MIO), Marseille, France
| | - Agnès Hirschler-Réa
- UM 110, CNRS, IRD, Aix Marseille Université, Institut Méditerranéen d'Océanologie (MIO), Marseille, France
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Zhang Z, Asefaw BK, Xiong Y, Chen H, Tang Y. Evidence and Mechanisms of Selenate Reduction to Extracellular Elemental Selenium Nanoparticles on the Biocathode. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:16259-16270. [PMID: 36239462 DOI: 10.1021/acs.est.2c05145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Intracellular selenium nanoparticles (SeNPs) production is a roadblock to the recovery of selenium from biological water treatment processes because it is energy intensive to break microbial cells and then separate SeNPs. This study provided evidence of significantly more extracellular SeNP production on the biocathode (97-99%) compared to the conventional reactors (1-90%) using transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy. The cathodic microbial community analysis showed that relative abundance of Azospira oryzae, Desulfovibrio, Stenotrophomonas, and Rhodocyclaceae was <1% in the inoculum but enriched to 10-21% for each group when the bioelectrochemical reactor reached a steady state. These four groups of microorganisms simultaneously produce intracellular and extracellular SeNPs in conventional biofilm reactors per literature review but prefer to produce extracellular SeNPs on the cathode. This observation may be explained by the cellular energetics: by producing extracellular SeNPs on the biocathode, microbes do not need to transfer selenate and the electrons from the cathode into the cells, thereby saving energy. Extracellular SeNP production on the biocathode is feasible since we found high concentrations of C-type cytochrome, which is well known for its ability to transfer electrons from electrodes to microbial cells and reduce selenate to SeNPs on the cell membrane.
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Affiliation(s)
- Zhiming Zhang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida32310, United States
| | - Benhur K Asefaw
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida32310, United States
| | - Yi Xiong
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida32310, United States
| | - Huan Chen
- National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida32310, United States
| | - Youneng Tang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida32310, United States
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Shi LD, Lv PL, McIlroy SJ, Wang Z, Dong XL, Kouris A, Lai CY, Tyson GW, Strous M, Zhao HP. Methane-dependent selenate reduction by a bacterial consortium. THE ISME JOURNAL 2021; 15:3683-3692. [PMID: 34183781 PMCID: PMC8630058 DOI: 10.1038/s41396-021-01044-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 06/08/2021] [Accepted: 06/15/2021] [Indexed: 02/06/2023]
Abstract
Methanotrophic microorganisms play a critical role in controlling the flux of methane from natural sediments into the atmosphere. Methanotrophs have been shown to couple the oxidation of methane to the reduction of diverse electron acceptors (e.g., oxygen, sulfate, nitrate, and metal oxides), either independently or in consortia with other microbial partners. Although several studies have reported the phenomenon of methane oxidation linked to selenate reduction, neither the microorganisms involved nor the underlying trophic interaction has been clearly identified. Here, we provide the first detailed evidence for interspecies electron transfer between bacterial populations in a bioreactor community where the reduction of selenate is linked to methane oxidation. Metagenomic and metaproteomic analyses of the community revealed a novel species of Methylocystis as the most abundant methanotroph, which actively expressed proteins for oxygen-dependent methane oxidation and fermentation pathways, but lacked the genetic potential for selenate reduction. Pseudoxanthomonas, Piscinibacter, and Rhodocyclaceae populations appeared to be responsible for the observed selenate reduction using proteins initially annotated as periplasmic nitrate reductases, with fermentation by-products released by the methanotrophs as electron donors. The ability for the annotated nitrate reductases to reduce selenate was confirmed by gene knockout studies in an isolate of Pseudoxanthomonas. Overall, this study provides novel insights into the metabolic flexibility of the aerobic methanotrophs that likely allows them to thrive across natural oxygen gradients, and highlights the potential role for similar microbial consortia in linking methane and other biogeochemical cycles in environments where oxygen is limited.
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Affiliation(s)
- Ling-Dong Shi
- grid.13402.340000 0004 1759 700XMOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Pan-Long Lv
- grid.13402.340000 0004 1759 700XMOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Simon J. McIlroy
- grid.489335.00000000406180938Centre for Microbiome Research, School of Biomedical Sciences, Queensland University of Technology (QUT), Translational Research Institute, Woolloongabba, QLD Australia ,grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, University of Queensland, Brisbane, QLD Australia
| | - Zhen Wang
- grid.13402.340000 0004 1759 700XMOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Xiao-Li Dong
- grid.22072.350000 0004 1936 7697Department of Geoscience, University of Calgary, Calgary, AB Canada
| | - Angela Kouris
- grid.22072.350000 0004 1936 7697Department of Geoscience, University of Calgary, Calgary, AB Canada
| | - Chun-Yu Lai
- grid.13402.340000 0004 1759 700XMOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China ,grid.1003.20000 0000 9320 7537Australian Centre for Ecogenomics, University of Queensland, Brisbane, QLD Australia
| | - Gene W. Tyson
- grid.489335.00000000406180938Centre for Microbiome Research, School of Biomedical Sciences, Queensland University of Technology (QUT), Translational Research Institute, Woolloongabba, QLD Australia
| | - Marc Strous
- grid.22072.350000 0004 1936 7697Department of Geoscience, University of Calgary, Calgary, AB Canada
| | - He-Ping Zhao
- grid.13402.340000 0004 1759 700XMOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
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Zhou C, Wang ZJ, Huang JC, Zheng L, Gan X, Zhang M, He S, Zhou W. Se transformation and removal by a cattail litter treatment system inoculated with sulfur-based denitrification sludge: Role of the microbial community composition under various temperature and aeration conditions. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126617. [PMID: 34271446 DOI: 10.1016/j.jhazmat.2021.126617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 06/17/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
With a narrow margin between deficiency and toxicity, rising levels of selenium (Se) are threatening aquatic ecosystems. To investigate the role of microorganisms in Se bioremediation, a cattail litter system inoculated with the sulfur-based denitrification sludge was conducted. The results show the litter, as a carrier and nutrient source for bacteria, efficiently removed Se by ~ 97.0% during a 12-d treatment with water circulating. As the major removal pathways, immobilization rates of selenite were ~ 2.9-fold higher than selenate, and the volatilization, contributing to ~ 87.7% of the total Se removal, was significantly correlated with temperature (positively) and oxidation-reduction potential (ORP; negatively). Using X-ray absorption spectroscopy to speciate litter-borne Se, more Se0 formed without aeration due to abundant Se-reducing bacteria, among which Azospira and Azospirillum were highly related to the removal of both Se oxyanions, while Desulfovibrio, Azoarcus, Sulfurospirillum, Thauera, Geobacter, Clostridium, and Pediococcus were the major contributors to selenate removal. Overall, our study suggests microbial Se metabolism in the litter system was significantly affected by temperature and ORP, which could be manipulated to enhance Se removal efficiency and the transformation of selenate/selenite into low toxic Se0 and volatile Se, reducing risks posed by the residual Se in the system.
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Affiliation(s)
- Chuanqi Zhou
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zi-Jing Wang
- Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan, ROC
| | - Jung-Chen Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan, ROC.
| | - Lixin Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Xinyu Gan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Manping Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Shengbing He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Weili Zhou
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Becerril-Varela K, Serment-Guerrero JH, Manzanares-Leal GL, Ramírez-Durán N, Guerrero-Barajas C. Generation of electrical energy in a microbial fuel cell coupling acetate oxidation to Fe 3+ reduction and isolation of the involved bacteria. World J Microbiol Biotechnol 2021; 37:104. [PMID: 34037857 DOI: 10.1007/s11274-021-03077-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 05/21/2021] [Indexed: 01/16/2023]
Abstract
An iron reducing enrichment was obtained from sulfate reducing sludge and was evaluated on the capability of reducing Fe3+ coupled to acetate oxidation in a microbial fuel cell (MFC). Three molar ratios for acetate/Fe3+ were evaluated (2/16, 3.4/27 and 6.9/55 mM). The percentages of Fe3+ reduction were in a range of 80-90, 60-70 and 40-50% for the MFCs at closed circuit for the molar ratios of 2/16, 3.4/27 and 6.9/55 mM, respectively. Acetate consumption was in a range of 80-90% in all cases. The results obtained at closed circuit for current density were: 11.37 mA/m2, 4.5 mA/m2 and 7.37 mA/m2 for the molar ratios of 2/16, 3.4/27 and 6.9/55 mM, respectively. Some microorganisms that were isolated and identified in the MFCs were Azospira oryzae, Cupriavidus metallidurans CH34, Enterobacter bugandensis 247BMC, Citrobacter freundii ATCC8090 and Citrobacter murliniae CDC2970-59, these bacteria have been reported as exoelectrogens in MFC and in MFC involving metals removal but not all of them have been reported to utilize acetate as preferred substrate. The results demonstrate that the isolates can utilize acetate as the sole source of carbon and suggest that Fe3+ reduction was carried out by a combination of different mechanisms (direct contact and redox mediators) utilized by the bacteria identified in the MFC. Storage of the energy generated from the 2/16 mM MFC system arranged in a series of three demonstrated that it is possible to utilize the energy to charge a battery.
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Affiliation(s)
- Karina Becerril-Varela
- Laboratorio de Biotecnología Ambiental, Departamento de Bioprocesos, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto s/n, Col. Barrio la Laguna Ticomán, 07340, Mexico City, Mexico
| | - Jorge H Serment-Guerrero
- Departamento de Biología, Instituto Nacional de Investigaciones Nucleares, 52750, Mexico City, Mexico
| | - Gauddy Lizeth Manzanares-Leal
- Laboratorio de Investigación en Microbiología Médica y Ambiental, Facultad de Medicina, Universidad Autónoma del Estado de México (UAEM), Paseo Tollocan Esq. Jesús Carranza, 50180, Toluca, Mexico
| | - Ninfa Ramírez-Durán
- Laboratorio de Investigación en Microbiología Médica y Ambiental, Facultad de Medicina, Universidad Autónoma del Estado de México (UAEM), Paseo Tollocan Esq. Jesús Carranza, 50180, Toluca, Mexico
| | - Claudia Guerrero-Barajas
- Laboratorio de Biotecnología Ambiental, Departamento de Bioprocesos, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto s/n, Col. Barrio la Laguna Ticomán, 07340, Mexico City, Mexico.
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Yang Z, Hosokawa H, Kuroda M, Inoue D, Ike M. Microbial antimonate reduction and removal potentials in river sediments. CHEMOSPHERE 2021; 266:129192. [PMID: 33310524 DOI: 10.1016/j.chemosphere.2020.129192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 10/23/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
Antimony (Sb), a toxic metalloid, exists mainly as Sb(V) and Sb(III) in the aquatic environment. Sb(V) displays greater solubility and can be reduced to insoluble Sb(III) compounds by microbial activities under anaerobic conditions, thus affecting the environmental fate of Sb. This study was conducted to evaluate the potential of Sb(V) reduction and removal from the aqueous phase by microbial communities existing in river sediments with and without the impact of Sb mining activities. Among the 14 tested sediment samples, which were collected from an urban river without Sb impact and a river flowing through mining area, microbial communities in two samples could reduce and remove Sb(V) in the presence of high concentrations of sulfate, whereas those in other six samples could reduce Sb(V) even under low sulfate concentrations, indicating the relatively wide distribution of microbial Sb(V) reduction potential in the environment, irrespective of the anthropogenic impact. The Sb(V) reduction and removal abilities under different sulfate levels also suggested the presence of multiple types of Sb(V) reduction and removal pathways, including the direct Sb(V) reduction by anaerobic respiration, indirect (chemical) Sb(V) reduction by sulfide produced by microbial sulfate reduction, and their combination. Furthermore, analysis of microbial communities in two enrichment cultures, which were constructed from sediment samples with Sb(V) reduction ability under the minimum sulfate condition and maintained Sb(V) removal ability during 28-d enrichment process, revealed possible contribution of several microbial taxa such as Azospira, Chlostridium, Dechloromonas, Dendrosporobacter, and Halodesulfovibrio to Sb(V) reduction in sediment microbial communities.
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Affiliation(s)
- Ziran Yang
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hisaaki Hosokawa
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masashi Kuroda
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Daisuke Inoue
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Michihiko Ike
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Hao L, Zhang B, Feng C, Zhang Z, Lei Z, Shimizu K. Human health risk of vanadium in farmland soils near various vanadium ore mining areas and bioremediation assessment. CHEMOSPHERE 2021; 263:128246. [PMID: 33297193 DOI: 10.1016/j.chemosphere.2020.128246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/31/2020] [Accepted: 09/01/2020] [Indexed: 06/12/2023]
Abstract
Various kinds of vanadium (V) ore mining areas produced serious contamination have been widely recognized, while less relevant research was about the associated health risk and V distribution level for farmland soils around. This study assessed the contamination characteristics and associated human health risk of V in the surface farmland soils near various V ore mining areas. The bioremediation of V contamination by indigenous microbes from them was also evaluated. The farmland soils near stone coal area (Hunan province, China) showed the highest mean concentration of V (543.91 mg/kg), posing high non-carcinogenic risks, with high hazard quotient (HQ) value of 1.29 for children. While, V values of sampled soils near V titanomagnetite, petroleum associated minerals and uvanite areas were lower than that near stone coal area, also with lower HQ values (<1.00). Within 60 h, the removal efficiency of V(V) reached 98.4% with farmland soils near uvanite area, suggesting feasibility of V bioremediation via indigenous microbes. Bacterial communities after long-term cultivation (240 d) with V(V) were dominated by native microbes able to tolerate or reduce the toxicity of V(V), such as Ruminococcaceae_incertae_sedis, Trichococcus and Comamonas. This work is helpful for calling attention to V pollution of farmland near various V ore mining areas and formulating effective strategies for V(V) contamination bioremediation.
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Affiliation(s)
- Liting Hao
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China; Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies, Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, 100044, PR China
| | - Baogang Zhang
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China.
| | - Chuanping Feng
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan
| | - Zhongfang Lei
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan
| | - Kazuya Shimizu
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan
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Lopes BC, Machado EC, Rodrigues HF, Leal CD, Araújo JCD, Teixeira de Matos A. Effect of alkaline treatment on pathogens, bacterial community and antibiotic resistance genes in different sewage sludges for potential agriculture use. ENVIRONMENTAL TECHNOLOGY 2020; 41:529-538. [PMID: 30051768 DOI: 10.1080/09593330.2018.1505960] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 07/22/2018] [Indexed: 06/08/2023]
Abstract
Alkaline treatment is widely used to reduce pathogens in sewage sludge in developing countries and guarantee that it is safe for use in agriculture. The aim of this study was to investigate the effect of alkaline treatment applied to waste-activated (WAS) and Upflow Anaerobic Sludge Blanket (UASB)-sludge on the bacterial community, pathogens (viable helminths eggs and Salmonella spp), and antibiotic resistance genes (ARG). The bacterial community structure was examined through denaturing gel gradient electrophoresis (DGGE), targeting 16S rRNA genes. Polymerase chain reaction (PCR) was applied to evaluate the presence of several ARGs. The conducted alkaline experiment consisted of adding hydrated lime (Ca(OH)2) to sewage sludges. Samples were taken before and after 2, 24, 48, and 72 hours of treatment. Alkaline treatment changed considerably the bacterial community structure and after 24 hours, shifts in bacterial profiles were more pronounced in the UASB sludge sample than in WAS. Some bacteria remained under extreme pH conditions (pH > 12), such as Azospira oryzae and Dechloromonas denitrificans in the WAS samples, and Geothrix and Geobacter in the UASB sludge samples. The values of pathogens and indicators in the sludge after 24 hours of alkaline treatment meet sanitary law regulations and thus the sludges could have the potential to agricultural distribution. It is important to highlight that ARG, which are not currently present in sanitary regulations, were detected in the sludge samples after the alkaline treatment, which could be a concern for human health.
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Affiliation(s)
- Bruna Coelho Lopes
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Elayne Cristina Machado
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Hortência Franco Rodrigues
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Cintia Dutra Leal
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Juliana Calábria de Araújo
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Antonio Teixeira de Matos
- Department of Sanitary and Environmental Engineering, Faculty of Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
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10
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Detoxification and reduction of selenite to elemental red selenium by Frankia. Antonie van Leeuwenhoek 2018; 112:127-139. [DOI: 10.1007/s10482-018-1196-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 11/02/2018] [Indexed: 12/25/2022]
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11
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Cao X, Diao M, Zhang B, Liu H, Wang S, Yang M. Spatial distribution of vanadium and microbial community responses in surface soil of Panzhihua mining and smelting area, China. CHEMOSPHERE 2017; 183:9-17. [PMID: 28527917 DOI: 10.1016/j.chemosphere.2017.05.092] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Revised: 04/21/2017] [Accepted: 05/15/2017] [Indexed: 05/13/2023]
Abstract
Spatial distribution of vanadium in surface soils from different processing stages of vanadium-bearing titanomagnetite in Panzhihua mining and smelting area (China) as well as responses of microbial communities including bacteria and fungi to vanadium were investigated by fieldwork and laboratory incubation experiment. The vanadium contents in this region ranged from 149.3 to 4793.6 mg kg-1, exceeding the soil background value of vanadium in China (82 mg kg-1) largely. High-throughput DNA sequencing results showed bacterial communities from different manufacturing locations were quite diverse, but Bacteroidetes and Proteobacteria were abundant in all samples. The contents of organic matter, available P, available S and vanadium had great influences on the structures of bacterial communities in soils. Bacterial communities converged to similar structure after long-term (240 d) cultivation with vanadium containing medium, dominating by bacteria which can tolerate or reduce toxicities of heavy metals. Fungal diversities decreased after cultivation, but Ascomycota and Ciliophora were still the most abundant phyla as in the original soil samples. Results in this study emphasize the urgency of investigating vanadium contaminations in soils and provide valuable information on how vanadium contamination influences bacterial and fungal communities.
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Affiliation(s)
- Xuelong Cao
- School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China
| | - Muhe Diao
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, 1090 GE, Amsterdam, The Netherlands
| | - Baogang Zhang
- School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China.
| | - Hui Liu
- School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China
| | - Song Wang
- School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China
| | - Meng Yang
- School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing, 100083, China
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12
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Anti-neoplastic selenium nanoparticles from Idiomarina sp. PR58-8. Enzyme Microb Technol 2016; 95:192-200. [DOI: 10.1016/j.enzmictec.2016.08.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Revised: 07/18/2016] [Accepted: 08/01/2016] [Indexed: 12/15/2022]
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13
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Lai CY, Wen LL, Shi LD, Zhao KK, Wang YQ, Yang X, Rittmann BE, Zhou C, Tang Y, Zheng P, Zhao HP. Selenate and Nitrate Bioreductions Using Methane as the Electron Donor in a Membrane Biofilm Reactor. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10179-86. [PMID: 27562531 DOI: 10.1021/acs.est.6b02807] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Selenate (SeO4(2-)) bioreduction is possible with oxidation of a range of organic or inorganic electron donors, but it never has been reported with methane gas (CH4) as the electron donor. In this study, we achieved complete SeO4(2-) bioreduction in a membrane biofilm reactor (MBfR) using CH4 as the sole added electron donor. The introduction of nitrate (NO3(-)) slightly inhibited SeO4(2-) reduction, but the two oxyanions were simultaneously reduced, even when the supply rate of CH4 was limited. The main SeO4(2-)-reduction product was nanospherical Se(0), which was identified by scanning electron microscopy coupled to energy dispersive X-ray analysis (SEM-EDS). Community analysis provided evidence for two mechanisms for SeO4(2-) bioreduction in the CH4-based MBfR: a single methanotrophic genus, such as Methylomonas, performed CH4 oxidation directly coupled to SeO4(2-) reduction, and a methanotroph oxidized CH4 to form organic metabolites that were electron donors for a synergistic SeO4(2-)-reducing bacterium.
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Affiliation(s)
- Chun-Yu Lai
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University , Hangzhou 310058, China
- Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University , Hangzhou, Zhejiang China
| | - Li-Lian Wen
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
| | - Ling-Dong Shi
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
| | - Kan-Kan Zhao
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
| | - Yi-Qi Wang
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
| | - Xiaoe Yang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University , Hangzhou 310058, China
| | - Bruce E Rittmann
- Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University , P.O. Box 875701, Tempe, Arizona 85287-5701, United States
| | - Chen Zhou
- Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University , P.O. Box 875701, Tempe, Arizona 85287-5701, United States
| | - Youneng Tang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering, Florida State University , Tallahassee, Florida 32310-6046, United States
| | - Ping Zheng
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
- Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University , Hangzhou, Zhejiang China
| | - He-Ping Zhao
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University , Hangzhou, China
- Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University , Hangzhou, Zhejiang China
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Microbial Transformations of Selenium Species of Relevance to Bioremediation. Appl Environ Microbiol 2016; 82:4848-59. [PMID: 27260359 DOI: 10.1128/aem.00877-16] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Selenium species, particularly the oxyanions selenite (SeO3 (2-)) and selenate (SeO4 (2-)), are significant pollutants in the environment that leach from rocks and are released by anthropogenic activities. Selenium is also an essential micronutrient for organisms across the tree of life, including microorganisms and human beings, particularly because of its presence in the 21st genetically encoded amino acid, selenocysteine. Environmental microorganisms are known to be capable of a range of transformations of selenium species, including reduction, methylation, oxidation, and demethylation. Assimilatory reduction of selenium species is necessary for the synthesis of selenoproteins. Dissimilatory reduction of selenate is known to support the anaerobic respiration of a number of microorganisms, and the dissimilatory reduction of soluble selenate and selenite to nanoparticulate elemental selenium greatly reduces the toxicity and bioavailability of selenium and has a major role in bioremediation and potentially in the production of selenium nanospheres for technological applications. Also, microbial methylation after reduction of Se oxyanions is another potentially effective detoxification process if limitations with low reaction rates and capture of the volatile methylated selenium species can be overcome. This review discusses microbial transformations of different forms of Se in an environmental context, with special emphasis on bioremediation of Se pollution.
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Han X, Wang Z, Ma J, Zhu C, Li Y, Wu Z. Membrane bioreactors fed with different COD/N ratio wastewater: impacts on microbial community, microbial products, and membrane fouling. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:11436-11445. [PMID: 25813643 DOI: 10.1007/s11356-015-4376-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 03/13/2015] [Indexed: 06/04/2023]
Abstract
It is known that an increase of COD/N ratio can result in an enhanced removal of nutrients in membrane bioreactors (MBRs); however, impacts of doing so on membrane filtration performance remain unclear. In this work, comparison of membrane filtration performance, microbial community, and microbial products under low temperature was carried out in anoxic/oxic (A/O) MBRs with COD/N ratios of 9.9 and 5.5 g COD/g N in influent. There was no doubt that an improvement of nitrogen removal under high COD/N ratio was observed; however, severer membrane fouling was found compared to the MBR fed with low COD/N ratio wastewater. The increase of COD/N ratio resulted in an elevated production of humic acids in soluble microbial product (SMP) and carbohydrates, proteins, and humic acids in loosely bound extracellular polymeric substance (LB-EPS). Quartz crystal microbalance with dissipation monitoring (QCM-D) analysis showed that the adsorption capability of SMP and LB-EPS was higher in the MBR with higher COD/N ratio. Four hundred fifty four high-throughput pyrosequencing revealed that the higher COD/N ratio led to the enrichment of Bacteroidetes at phylum level and Azospira, Thauera, Zoogloea, etc. at genus level. Bacteroidetes are considered to potentially release EPS, and Azospira, Thauera, and Zoogloea, etc. have denitrification activity. The change in microbial communities is consistent with MBR performance.
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Affiliation(s)
- Xiaomeng Han
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, People's Republic of China
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Srivastava P, Braganca JM, Kowshik M. In vivosynthesis of selenium nanoparticles byHalococcus salifodinaeBK18 and their anti-proliferative properties against HeLa cell line. Biotechnol Prog 2014; 30:1480-7. [DOI: 10.1002/btpr.1992] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 08/26/2014] [Indexed: 01/05/2023]
Affiliation(s)
- Pallavee Srivastava
- Dept. of Biological Sciences; Birla Inst. of Technology and Science Pilani; K K Birla Goa Campus, NH-17B Zuarinagar Goa 403 726 India
| | - Judith M. Braganca
- Dept. of Biological Sciences; Birla Inst. of Technology and Science Pilani; K K Birla Goa Campus, NH-17B Zuarinagar Goa 403 726 India
| | - Meenal Kowshik
- Dept. of Biological Sciences; Birla Inst. of Technology and Science Pilani; K K Birla Goa Campus, NH-17B Zuarinagar Goa 403 726 India
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Li B, Liu N, Li Y, Jing W, Fan J, Li D, Zhang L, Zhang X, Zhang Z, Wang L. Reduction of selenite to red elemental selenium by Rhodopseudomonas palustris strain N. PLoS One 2014; 9:e95955. [PMID: 24759917 PMCID: PMC3997485 DOI: 10.1371/journal.pone.0095955] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 04/01/2014] [Indexed: 02/03/2023] Open
Abstract
The trace metal selenium is in demand for health supplements to human and animal nutrition. We studied the reduction of selenite (SeO₃⁻²) to red elemental selenium by Rhodopseudomonas palustris strain N. This strain was cultured in a medium containing SeO₃⁻² and the particles obtained from cultures were analyzed using transmission electron microscopy (TEM), energy dispersive microanalysis (EDX) and X ray diffraction analysis (XRD). Our results showed the strain N could reduce SeO₃⁻² to red elemental selenium. The diameters of particles were 80-200 nm. The bacteria exhibited significant tolerance to SeO₃⁻² up to 8.0 m mol/L concentration with an EC₅₀ value of 2.4 m mol/L. After 9 d of cultivation, the presence of SeO₃²⁻ up to 1.0 m mol/L resulted in 99.9% reduction of selenite, whereas 82.0% (p<0.05), 31.7% (p<0.05) and 2.4% (p<0.05) reduction of SeO₃⁻² was observed at 2.0, 4.0 and 8.0 m mol/L SeO₃²⁻ concentrations, respectively. This study indicated that red elemental selenium was synthesized by green technology using Rhodopseudomonas palustris strain N. This strain also indicated a high tolerance to SeO₃⁻². The finding of this work will contribute to the application of selenium to human health.
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Affiliation(s)
- Baozhen Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Na Liu
- School of Life Science, Shanxi University, Taiyuan, China
| | - Yongquan Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Weixin Jing
- School of Life Science, Shanxi University, Taiyuan, China
| | - Jinhua Fan
- School of Life Science, Shanxi University, Taiyuan, China
| | - Dan Li
- School of Life Science, Shanxi University, Taiyuan, China
| | - Longyan Zhang
- School of Life Science, Shanxi University, Taiyuan, China
| | | | - Zhaoming Zhang
- School of Life Science, Shanxi University, Taiyuan, China
| | - Lan Wang
- School of Life Science, Shanxi University, Taiyuan, China
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Transcriptional Response of Selenopolypeptide Genes and Selenocysteine Biosynthesis Machinery Genes in Escherichia coli during Selenite Reduction. Int J Microbiol 2014; 2014:394835. [PMID: 24839442 PMCID: PMC4009273 DOI: 10.1155/2014/394835] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Revised: 02/28/2014] [Accepted: 03/16/2014] [Indexed: 01/05/2023] Open
Abstract
Bacteria can reduce toxic selenite into less toxic, elemental selenium (Se0), but the mechanism on how bacterial cells reduce selenite at molecular level is still not clear. We used Escherichia coli strain K12, a common bacterial strain, as a model to study its growth response to sodium selenite (Na2SeO3) treatment and then used quantitative real-time PCR (qRT-PCR) to quantify transcript levels of three E. coli selenopolypeptide genes and a set of machinery genes for selenocysteine (SeCys) biosynthesis and incorporation into polypeptides, whose involvements in the selenite reduction are largely unknown. We determined that 5 mM Na2SeO3 treatment inhibited growth by ∼50% while 0.001 to 0.01 mM treatments stimulated cell growth by ∼30%. Under 50% inhibitory or 30% stimulatory Na2SeO3 concentration, selenopolypeptide genes (fdnG, fdoG, and fdhF) whose products require SeCys but not SeCys biosynthesis machinery genes were found to be induced ≥2-fold. In addition, one sulfur (S) metabolic gene iscS and two previously reported selenite-responsive genes sodA and gutS were also induced ≥2-fold under 50% inhibitory concentration. Our findings provide insight about the detoxification of selenite in E. coli via induction of these genes involved in the selenite reduction process.
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19
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Pseudomonas seleniipraecipitans proteins potentially involved in selenite reduction. Curr Microbiol 2014; 69:69-74. [PMID: 24604150 DOI: 10.1007/s00284-014-0555-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 01/14/2014] [Indexed: 10/25/2022]
Abstract
Pseudomonas seleniipraecipitans grows in the presence of high levels of selenite and selenate and reduces both oxyanions to elemental selenium (Se(0)), a property that may make P. seleniipraecipitans useful as an inoculant for biobarriers designed to remove selenite or selenate from ground or surface waters. An earlier study showed that P. seleniipraecipitans nitrate reductase reduced selenate to Se(0), but failed to identify the protein(s) involved in selenite reduction. This study used ammonium sulfate precipitation, hydrophobic interaction chromatography, and native PAGE to isolate two electrophoretic gel regions, identified as bands A and B that showed selenite-reductase-activity. Proteomics was used to identify the proteins present in those regions. Glutathione reductase (GR) was detected in the A-band; based on this information, Saccharomyces cerevisiae GR, obtained from a commercial source, was evaluated and found to have selenite-reductase-activity, confirming that GR can reduce selenite to Se(0). Proteomics was also used to detect the proteins present in the B-band and thioredoxin reductase (ThxR) was detected as a B-band protein; based on this information, E. coli ThxR, obtained from a commercial source, was evaluated and found to have selenite-reductase-activity, confirming that ThxR can reduce selenite to elemental selenium. Thus, evidence presented in this study shows that S. cerevisiae GR and E. coli ThxR can reduce SeO3 (2-) to Se(0) and strongly suggests that P. seleniipraecipitans GR and ThxR can also reduce SeO3 (2-) to Se(0).
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Hunter WJ. A Rhizobium selenitireducens protein showing selenite reductase activity. Curr Microbiol 2013; 68:311-6. [PMID: 24474405 DOI: 10.1007/s00284-013-0474-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Accepted: 08/28/2013] [Indexed: 10/26/2022]
Abstract
Biobarriers remove, via precipitation, the metalloid selenite (SeO₃⁻²) from groundwater; a process that involves the biological reduction of soluble SeO₃⁻² to insoluble elemental red selenium (Se⁰). The enzymes associated with this reduction process are poorly understood. In Rhizobium selenitireducens at least two enzymes are potentially involved; one, a nitrite reductase reduces SeO₃⁻² to Se⁰ but another protein may also be involved which is investigated in this study. Proteins from R. selenitireducens cells were precipitated with ammonium sulfate and run on native electrophoresis gels. When these gels were incubated with NADH and SeO₃⁻² a band of precipitated Se⁰ developed signifying the presence of a SeO₃⁻² reducing protein. Bands were cut from the gel and analyzed for peptides via LCMSMS. The amino acid sequences associated with the bands indicated the presence of an NADH:flavin oxidoreductase that resembles YP_001326930 from Sinorhizobium medicae. The protein is part of a protein family termed old-yellow-enzymes (OYE) that contain a flavin binding domain. OYE enzymes are often involved in protecting cells from oxidative stress and, due in part to an active site that has a highly accessible binding pocket, are generally active on a wide range of substrates. This report is the first of an OYE enzyme being involved in SeO₃⁻² reduction.
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Affiliation(s)
- W J Hunter
- United States Department of Agriculture-Agricultural Research Service, 2150-D Centre Avenue, Fort Collins, CO, 80526-8119, USA,
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21
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Williams KH, Wilkins MJ, N'Guessan AL, Arey B, Dodova E, Dohnalkova A, Holmes D, Lovley DR, Long PE. Field evidence of selenium bioreduction in a uranium-contaminated aquifer. ENVIRONMENTAL MICROBIOLOGY REPORTS 2013; 5:444-452. [PMID: 23905166 DOI: 10.1111/1758-2229.12032] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Removal of selenium from groundwater was documented during injection of acetate into a uranium-contaminated aquifer near Rifle, Colorado (USA). Bioreduction of aqueous selenium to its elemental form (Se0) concentrated it within mineralized biofilms affixed to tubing used to circulate acetate-amended groundwater. Scanning and transmission electron microscopy revealed close association between Se0 precipitates and cell surfaces, with Se0 aggregates having a diameter of 50-60 nm. Accumulation of Se0 within biofilms occurred over a three-week interval at a rate of c. 9 mg Se0 m(-2) tubing day(-1). Removal was inferred to result from the activity of a mixed microbial community within the biofilms capable of coupling acetate oxidation to the reduction of oxygen, nitrate and selenate. Phylogenetic analysis of the biofilm revealed a community dominated by strains of Dechloromonas sp. and Thauera sp., with isolates exhibiting genetic similarity to the latter known to reduce selenate to Se0. Enrichment cultures of selenate-respiring microorganisms were readily established using Rifle site groundwater and acetate, with cultures dominated by strains closely related to D. aromatica (96-99% similarity). Predominance of Dechloromonas sp. in recovered biofilms and enrichments suggests this microorganism may play a role in the removal of selenium oxyanions present in Se-impacted groundwaters and sediments.
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22
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Complete genome sequence of the anaerobic perchlorate-reducing bacterium Azospira suillum strain PS. J Bacteriol 2012; 194:2767-8. [PMID: 22535943 DOI: 10.1128/jb.00124-12] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Azospira suillum strain PS (formally Dechlorosoma suillum strain PS) is a metabolically versatile betaproteobacterium first identified for its ability to grow by dissimilatory reduction of perchlorate and chlorate [denoted (per)chlorate]. Together with Dechloromonas species, these two genera represent the dominant (per)chlorate-reducing bacteria in mesophilic freshwater environments. In addition to (per)chlorate reduction, A. suillum is capable of the anaerobic oxidation of humic substances and is the first anaerobic nitrate-dependent Fe(II) oxidizer outside the Diaphorobacter and Acidovorax genera for which there is a completed genome sequence.
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Dumas MD, Polson SW, Ritter D, Ravel J, Gelb J, Morgan R, Wommack KE. Impacts of poultry house environment on poultry litter bacterial community composition. PLoS One 2011; 6:e24785. [PMID: 21949751 PMCID: PMC3174962 DOI: 10.1371/journal.pone.0024785] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Accepted: 08/17/2011] [Indexed: 11/25/2022] Open
Abstract
Viral and bacterial pathogens are a significant economic concern to the US broiler industry and the ecological epicenter for poultry pathogens is the mixture of bedding material, chicken excrement and feathers that comprises the litter of a poultry house. This study used high-throughput sequencing to assess the richness and diversity of poultry litter bacterial communities, and to look for connections between these communities and the environmental characteristics of a poultry house including its history of gangrenous dermatitis (GD). Cluster analysis of 16S rRNA gene sequences revealed differences in the distribution of bacterial phylotypes between Wet and Dry litter samples and between houses. Wet litter contained greater diversity with 90% of total bacterial abundance occurring within the top 214 OTU clusters. In contrast, only 50 clusters accounted for 90% of Dry litter bacterial abundance. The sixth largest OTU cluster across all samples classified as an Arcobacter sp., an emerging human pathogen, occurring in only the Wet litter samples of a house with a modern evaporative cooling system. Ironically, the primary pathogenic clostridial and staphylococcal species associated with GD were not found in any house; however, there were thirteen 16S rRNA gene phylotypes of mostly gram-positive phyla that were unique to GD-affected houses and primarily occurred in Wet litter samples. Overall, the poultry house environment appeared to substantially impact the composition of litter bacterial communities and may play a key role in the emergence of food-borne pathogens.
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Affiliation(s)
- Michael D. Dumas
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America
| | - Shawn W. Polson
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America
- Delaware Biotechnology Institute, University of Delaware, Newark, Delaware, United States of America
- Center for Bioinformatics and Computational Biology, University of Delaware, Newark, Delaware, United States of America
| | - Don Ritter
- Mountaire Farms Inc., Millsboro, Delaware, United States of America
| | - Jacques Ravel
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Jack Gelb
- Department of Animal and Food Sciences, University of Delaware, Newark, Delaware, United States of America
| | - Robin Morgan
- Department of Animal and Food Sciences, University of Delaware, Newark, Delaware, United States of America
| | - K. Eric Wommack
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America
- Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, United States of America
- Delaware Biotechnology Institute, University of Delaware, Newark, Delaware, United States of America
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Lenz M, Lens PNL. The essential toxin: the changing perception of selenium in environmental sciences. THE SCIENCE OF THE TOTAL ENVIRONMENT 2009; 407:3620-33. [PMID: 18817944 DOI: 10.1016/j.scitotenv.2008.07.056] [Citation(s) in RCA: 200] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 07/17/2008] [Accepted: 07/30/2008] [Indexed: 05/12/2023]
Abstract
During the last decades, the perception of selenium has undergone substantial changes. While its toxic effects were recognized causing hair and hoof loss in animals during the 1930s, its essential role in microbial, animal and human metabolism has been recognized later, i.e. with the discovery of selenium deficiency causing "white muscle disease" in feedstock in the 1950s. Nowadays, the positive effect of systematic selenium supplementation is discussed in manifold topics such as cancer or diabetes prevention and avian influenza susceptibility. Treatment of selenium containing waste streams poses a notable challenge to environmental engineers, and to date no ultimate solution has been found for e.g. the selenium contamination in agricultural areas of the western USA. For the future, selenium contamination carries an imminent danger, if the increasing energy demand is covered by fossil fuel combustion, which will lead to major selenium emission and toxicity. This review presents current knowledge of selenium's role in environmental sciences and outlines potentially feasible treatment options targeting a variety of selenium contaminated waste streams.
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Affiliation(s)
- Markus Lenz
- Sub-Department of Environmental Technology, Wageningen University, Bomenweg 2, 6700 EV Wageningen, The Netherlands
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26
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Vadose Zone Microbial Biobarriers Remove Nitrate from Percolating Groundwater. Curr Microbiol 2009; 58:622-7. [DOI: 10.1007/s00284-009-9380-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 01/27/2009] [Accepted: 02/06/2009] [Indexed: 10/21/2022]
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27
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Hunter WJ, Manter DK. Reduction of Selenite to Elemental Red Selenium by Pseudomonas sp. Strain CA5. Curr Microbiol 2009; 58:493-8. [DOI: 10.1007/s00284-009-9358-2] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 12/23/2008] [Accepted: 12/25/2008] [Indexed: 11/28/2022]
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28
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Takada T, Hirata M, Kokubu S, Toorisaka E, Ozaki M, Hano T. Kinetic study on biological reduction of selenium compounds. Process Biochem 2008. [DOI: 10.1016/j.procbio.2008.06.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hunter WJ, Manter DK. Bio-reduction of selenite to elemental red selenium by Tetrathiobacter kashmirensis. Curr Microbiol 2008; 57:83-8. [PMID: 18389307 DOI: 10.1007/s00284-008-9160-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Accepted: 02/28/2008] [Indexed: 11/29/2022]
Abstract
A bacterium that detoxifies selenite by reduction to insoluble elemental red selenium was isolated from soil. The strain showed an unusually high resistance to the toxic effects of selenite by growing in media containing 64 mM selenite. 16S rRNA gene sequence alignment identified the isolate as Tetrathiobacter kashmirensis. Fatty acid analysis and morphology confirmed the identification. The isolate reduced selenite to elemental selenium under aerobic conditions only. Native gel electrophoresis of cell-free extracts revealed a band, corresponding to a molecular weight of approximately 120 kDa, that reduced selenite. In culture, the strain did not reduce selenate; however, a soluble and inducible enzyme with a molecular weight of approximately 90 kDa that reduced both selenate and nitrate was present in cell-free extracts. This organism might be useful in bioreactors designed to remove selenite from contaminated water.
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Hunter WJ, Kuykendall LD. Reduction of selenite to elemental red selenium by Rhizobium sp. strain B1. Curr Microbiol 2007; 55:344-9. [PMID: 17882505 DOI: 10.1007/s00284-007-0202-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2007] [Accepted: 05/16/2007] [Indexed: 10/22/2022]
Abstract
A bacterium that reduces the soluble and toxic selenite anion to insoluble elemental red selenium (Se(0)) was isolated from a laboratory bioreactor. Biochemical, morphological, and 16S rRNA gene sequence alignment identified the isolate as a Rhizobium sp. that is related to but is genetically divergent from R. radiobacter (syn. Agrobacterium tumefaciens) or R. rubi (syn. A. rubi). The isolate was capable of denitrification and reduced selenite to Se(0) under aerobic and denitrifying conditions. It did not reduce selenate and did not use selenite or selenate as terminal e(-) donors. Native gel electrophoresis revealed two bands, corresponding to molecular weights of approximately 100 and approximately 45 kDa, that reduced selenite. Tungsten inhibited in vivo selenite reduction, suggesting that a molybdenum-containing protein is involved in selenite reduction. This organism, or its enzymes or DNA, might be useful in bioreactors designed to remove selenite from water.
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