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[PMID]:29306027
[Au] Autor:Harris AP; Ismail KA; Nunez M; Martopullo I; Lencinas A; Selmin OI; Runyan RB
[Ad] Endereço:Department of Cellular & Molecular Medicine, University of Arizona, Tucson, AZ 85724-5044, United States.
[Ti] Título:Trichloroethylene perturbs HNF4a expression and activity in the developing chick heart.
[So] Source:Toxicol Lett;285:113-120, 2018 Mar 15.
[Is] ISSN:1879-3169
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Exposure to trichloroethylene (TCE) is linked to formation of congenital heart defects in humans and animals. Prior interactome analysis identified the transcription factor, Hepatocyte Nuclear Factor 4 alpha (HNF4a), as a potential target of TCE exposure. As a role for HNF4a is unknown in the heart, we examined developing avian hearts for HNF4a expression and for sensitivity to TCE and the HNF4a agonist, Benfluorex. In vitro analysis using a HNF4a reporter construct showed both TCE and HFN4a to be antagonists of HNF4a-mediated transcription at the concentrations tested. HNF4a mRNA is expressed transiently in the embryonic heart during valve formation and cardiac development. Embryos were examined for altered gene expression in the presence of TCE or Benfluorex. TCE altered expression of selected mRNAs including HNF4a, TRAF6 and CYP2C45. There was a transition between inhibition and induction of marker gene expression in embryos as TCE concentration increased. Benfluorex was largely inhibitory to selected markers. Echocardiography of exposed embryos showed reduced cardiac function with both TCE and Benfluorex. Cardiac contraction was reduced by 29% and 23%, respectively at 10 ppb. The effects of TCE and Benfluorex on autocrine regulation of HNF4a, selected markers and cardiac function argue for a functional interaction of TCE and HNF4a. Further, the dose-sensitive shift between inhibition and induction of marker expression may explain the nonmonotonic-like dose response observed with TCE exposure in the heart.
[Mh] Termos MeSH primário: Poluentes Ambientais/toxicidade
Coração/efeitos dos fármacos
Fator 4 Nuclear de Hepatócito/genética
Transcrição Genética/efeitos dos fármacos
Tricloroetileno/toxicidade
[Mh] Termos MeSH secundário: Animais
Embrião de Galinha
Relação Dose-Resposta a Droga
Ecocardiografia
Fenfluramina/análogos & derivados
Fenfluramina/farmacologia
Genes Reporter
Coração/diagnóstico por imagem
Coração/embriologia
Células Hep G2
Fator 4 Nuclear de Hepatócito/agonistas
Seres Humanos
Miocárdio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (HNF4A protein, human); 0 (Hepatocyte Nuclear Factor 4); 290YE8AR51 (Trichloroethylene); 2DS058H2CF (Fenfluramine); 403FO0NQG3 (benfluorex)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180219
[Lr] Data última revisão:
180219
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180107
[St] Status:MEDLINE


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[PMID]:29190187
[Au] Autor:Luo YS; Furuya S; Chiu W; Rusyn I
[Ad] Endereço:a Department of Veterinary Integrative Biosciences , Texas A&M University , College Station , TX , USA.
[Ti] Título:Characterization of inter-tissue and inter-strain variability of TCE glutathione conjugation metabolites DCVG, DCVC, and NAcDCVC in the mouse.
[So] Source:J Toxicol Environ Health A;81(1-3):37-52, 2018.
[Is] ISSN:1528-7394
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Trichloroethylene (TCE) is a ubiquitous environmental toxicant that is a liver and kidney carcinogen. Conjugation of TCE with glutathione (GSH) leads to formation of nepthrotoxic and mutagenic metabolites postulated to be critical for kidney cancerdevelopment; however, relatively little is known regarding their tissue levels as previous analytical methods for their detection lacked sensitivity. Here, an LC-MS/MS-based method for simultaneous detection of S-(1,2-dichlorovinyl)-glutathione (DCVG), S-(1,2-dichlorovinyl)-L-cysteine (DCVC), and N-acetyl-S-(1,2-dichlorovinyl)-L-cysteine (NAcDCVC) in multiple mouse tissues was developed. This analytical method is rapid, sensitive (limits of detection (LOD) 3-30 fmol across metabolites and tissues), and robust to quantify all three metabolites in liver, kidneys, and serum. The method was used to characterize inter-tissue and inter-strain variability in formation of conjugative metabolites of TCE. Single oral dose of TCE (24, 240 or 800 mg/kg) was administered to male mice from 20 inbred strains of Collaborative Cross. Inter-strain variability in the levels of DCVG, DCVC, and NAcDCVC (GSD = 1.6-2.9) was observed. Whereas NAcDCVC was distributed equally among analyzed tissues, highest levels of DCVG were detected in liver and DCVC in kidneys. Evidence indicated that inter-strain variability in conjugative metabolite formation of TCE might affect susceptibility to adverse health effects and that this method might aid in filling data gaps in human health assessment of TCE.
[Mh] Termos MeSH primário: Acetilcisteína/análogos & derivados
Cisteína/análogos & derivados
Glutationa/análogos & derivados
Glutationa/metabolismo
Glutationa/toxicidade
Tricloroetileno/metabolismo
Tricloroetileno/toxicidade
[Mh] Termos MeSH secundário: Acetilcisteína/metabolismo
Acetilcisteína/toxicidade
Animais
Cisteína/metabolismo
Cisteína/toxicidade
Fígado/metabolismo
Masculino
Camundongos
Camundongos Endogâmicos
Razão Sinal-Ruído
Distribuição Tecidual
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
104713-70-4 (S-1,2-dichlorovinyl-N-acetylcysteine); 290YE8AR51 (Trichloroethylene); 627-72-5 (S-(1,2-dichlorovinyl)cysteine); 96614-59-4 (S-(1,2-dichlorovinyl)glutathione); GAN16C9B8O (Glutathione); K848JZ4886 (Cysteine); WYQ7N0BPYC (Acetylcysteine)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171219
[Lr] Data última revisão:
171219
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE
[do] DOI:10.1080/15287394.2017.1408512


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[PMID]:28463483
[Au] Autor:Legault EK; James CA; Stewart K; Muiznieks I; Doty SL; Strand SE
[Ad] Endereço:Department of Civil and Environmental Engineering, UW Box 355014, University of Washington , Seattle, Washington, United States.
[Ti] Título:A Field Trial of TCE Phytoremediation by Genetically Modified Poplars Expressing Cytochrome P450 2E1.
[So] Source:Environ Sci Technol;51(11):6090-6099, 2017 Jun 06.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A controlled field study was performed to evaluate the effectiveness of transgenic poplars for phytoremediation. Three hydraulically contained test beds were planted with 12 transgenic poplars, 12 wild type (WT) poplars, or left unplanted, and dosed with equivalent concentrations of trichloroethylene (TCE). Removal of TCE was enhanced in the transgenic tree bed, but not to the extent of the enhanced removal observed in laboratory studies. Total chlorinated ethene removal was 87% in the CYP2E1 bed, 85% in the WT bed, and 34% in the unplanted bed in 2012. Evapotranspiration of TCE from transgenic leaves was reduced by 80% and diffusion of TCE from transgenic stems was reduced by 90% compared to WT. Cis-dichloroethene and vinyl chloride levels were reduced in the transgenic tree bed. Chloride ion accumulated in the planted beds corresponding to the TCE loss, suggesting that contaminant dehalogenation was the primary loss fate.
[Mh] Termos MeSH primário: Biodegradação Ambiental
Populus/enzimologia
Tricloroetileno
[Mh] Termos MeSH secundário: Citocromo P-450 CYP2E1/metabolismo
Árvores
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
290YE8AR51 (Trichloroethylene); EC 1.14.13.- (Cytochrome P-450 CYP2E1)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171211
[Lr] Data última revisão:
171211
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.5b04758


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[PMID]:28891786
[Au] Autor:Ginsberg G; Vulimiri SV; Lin YS; Kancherla J; Foos B; Sonawane B
[Ad] Endereço:a Partnership in Pediatric and Environmental Health , Hartford , CT , USA.
[Ti] Título:A framework and case studies for evaluation of enzyme ontogeny in children's health risk evaluation.
[So] Source:J Toxicol Environ Health A;80(10-12):569-593, 2017.
[Is] ISSN:1528-7394
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Knowledge of the ontogeny of Phase I and Phase II metabolizing enzymes may be used to inform children's vulnerability based upon likely differences in internal dose from xenobiotic exposure. This might provide a qualitative assessment of toxicokinetic (TK) variability and uncertainty pertinent to early lifestages and help scope a more quantitative physiologically based toxicokinetic (PBTK) assessment. Although much is known regarding the ontogeny of metabolizing systems, this is not commonly utilized in scoping and problem formulation stage of human health risk evaluation. A framework is proposed for introducing this information into problem formulation which combines data on enzyme ontogeny and chemical-specific TK to explore potential child/adult differences in internal dose and whether such metabolic differences may be important factors in risk evaluation. The framework is illustrated with five case study chemicals, including some which are data rich and provide proof of concept, while others are data poor. Case studies for toluene and chlorpyrifos indicate potentially important child/adult TK differences while scoping for acetaminophen suggests enzyme ontogeny is unlikely to increase early-life risks. Scoping for trichloroethylene and aromatic amines indicates numerous ways that enzyme ontogeny may affect internal dose which necessitates further evaluation. PBTK modeling is a critical and feasible next step to further evaluate child-adult differences in internal dose for a number of these chemicals.
[Mh] Termos MeSH primário: Saúde da Criança
Enzimas/metabolismo
Modelos Teóricos
[Mh] Termos MeSH secundário: Acetaminofen/toxicidade
Aminas/toxicidade
Criança
Clorpirifos/toxicidade
Poluentes Ambientais/toxicidade
Seres Humanos
Projetos de Pesquisa
Medição de Risco
Tolueno/toxicidade
Toxicocinética
Tricloroetileno/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amines); 0 (Environmental Pollutants); 0 (Enzymes); 290YE8AR51 (Trichloroethylene); 362O9ITL9D (Acetaminophen); 3FPU23BG52 (Toluene); JCS58I644W (Chlorpyrifos)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170912
[St] Status:MEDLINE
[do] DOI:10.1080/15287394.2017.1369915


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[PMID]:28693899
[Au] Autor:Shapiro AM; Evans CE; Hayes EC
[Ad] Endereço:U.S. Geological Survey, 12201 Sunrise Valley Drive, Mail Stop 431, Reston, VA, USA. Electronic address: ashapiro@usgs.gov.
[Ti] Título:Porosity and pore size distribution in a sedimentary rock: Implications for the distribution of chlorinated solvents.
[So] Source:J Contam Hydrol;203:70-84, 2017 Aug.
[Is] ISSN:1873-6009
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Characterizing properties of the rock matrix that control retention and release of chlorinated solvents is essential in evaluating the extent of contamination and the application of remediation technologies in fractured rock. Core samples from seven closely spaced boreholes in a mudstone subject to trichloroethene (TCE) contamination were analyzed using Mercury Intrusion Porosimetry to investigate porosity and pore size distribution as a function of mudstone characteristics, and depth and lateral extent in the aquifer; organic carbon content was also evaluated to identify the potential for adsorption. Porosity and retardation factor varied over two orders of magnitude, with the largest porosities and largest retardation factors associated with carbon-rich mudstone layers. Larger porosities were also measured in the shallow rock that has been subject to enhanced groundwater flow. Porosity also varied over more than an order of magnitude in spatially continuous mudstone layers. The analyses of the rock cores indicated that the largest pore diameters may be accessible to entry of the nonaqueous form of TCE. Although the porosity associated with the largest pore diameters is small (~0.1%), that volume of TCE can significantly affect the total TCE that is retained in the rock matrix. The dimensions of the largest pore diameters may also be accessible to microbes responsible for reductive dechlorination; however, the small percentage of the pore space that can accommodate microbes may limit the extent of reductive dechlorination in the rock matrix.
[Mh] Termos MeSH primário: Água Subterrânea
Tricloroetileno/análise
Poluentes Químicos da Água
[Mh] Termos MeSH secundário: Adsorção
Água Subterrânea/análise
Halogenação
New Jersey
Porosidade
Solventes/análise
Poluentes Químicos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Solvents); 0 (Water Pollutants, Chemical); 290YE8AR51 (Trichloroethylene)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170712
[St] Status:MEDLINE


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[PMID]:28647265
[Au] Autor:Chheda D; Sorial GA
[Ad] Endereço:Department of Biomedical, Chemical, and Environmental Engineering, College of Engineering and Applied Science, University of Cincinnati, 701 Engineering Research Center, 2901 Woodside Drive, Cincinnati, OH 45221-0012, USA.
[Ti] Título:Evaluation of co-metabolic removal of trichloroethylene in a biotrickling filter under acidic conditions.
[So] Source:J Environ Sci (China);57:54-61, 2017 Jul.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:This study investigated the removal of hydrophobic trichloroethylene (TCE) in the presence of methanol (co-metabolite) in a biotrickling filter, which was seeded with fungi at pH4. Starvation was chosen as the biomass control strategy. Two systems, Biofilter I (methanol:TCE 70:30) and Biofilter II (methanol:TCE 80:20) were run in parallel, each with varying composition ratios. The TCE loading rates for both biofilters ranged from 3.22 to 12.88g/m /hr. Depending on the ratio, methanol concentrations varied from 4.08 to 27.95g/m /hr. The performance of the systems was evaluated and compared by calculating removal kinetics, carbon mass balance, efficiencies and elimination capacities. Methanol was observed to enhance TCE removal during the initial loading rate. However, methanol later inhibited TCE degradation above 6.44g TCE/m /hr (Biofilter I) and 3.22g TCE/m /hr (Biofilter II). Conversely, TCE did not impede methanol removal because over 95% methanol elimination was consistently achieved. Overall, Biofilter I was able to outperform Biofilter II due to its greater resistance towards methanol competition.
[Mh] Termos MeSH primário: Filtração/métodos
Tricloroetileno/metabolismo
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Fungos/metabolismo
Concentração de Íons de Hidrogênio
Tricloroetileno/análise
Poluentes Químicos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 290YE8AR51 (Trichloroethylene)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170714
[Lr] Data última revisão:
170714
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170626
[St] Status:MEDLINE


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[PMID]:28551209
[Au] Autor:Srirattana S; Piaowan K; Lowry GV; Phenrat T
[Ad] Endereço:Research Unit for Integrated Natural Resources Remediation and Reclamation (IN3R), Department of Civil Engineering, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand; Center of Excellence for Sustainability of Health, Environment and Industry (SHEI), Faculty of Engineering, N
[Ti] Título:Electromagnetic induction of foam-based nanoscale zerovalent iron (NZVI) particles to thermally enhance non-aqueous phase liquid (NAPL) volatilization in unsaturated porous media: Proof of concept.
[So] Source:Chemosphere;183:323-331, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Nanoscale zerovalent iron (NZVI) is a promising remediation agent for volatile organic compound (VOC) contamination in saturated sub-surfaces, but is rarely applied to the vadose zone as there are not enough water molecules in the unsaturated zone to participate in reductive dechlorination. In this study, we evaluated the possibility of using foam as a carrying vehicle to emplace NZVI in unsaturated porous media followed by the application of low frequency-electromagnetic field (LF-EMF) to enhance VOC volatilization in laboratory batch reactors. We found that the optimal condition for generating foam-based NZVI (F-NZVI) was using sodium lauryl ether sulfate (SLES) at a concentration of 3% (w/w) and a N flow rate of 500 mL/min. Also, F-NZVI could carry as much as 41.31 g/L of NZVI in the liquid phase of the foam and generate heat to raise ΔT to 77 °C in 15 min under an applied LF-EMF (150 kHz and 13 A). Under these conditions, F-NZVI together with LF-EMF enhanced trichloroethylene (TCE) volatilization from TCE-dense non-aqueous phase liquid (DNAPL) in unsaturated sand by 39.51 ± 6.59-fold compared to reactors without LF-EMF application. This suggested that using F-NZVI together with LF-EMF could theoretically be an alternative to radio frequency heating (RFH) as it requires a much lower irradiation frequency (336-fold lower), which should result in significantly lower capital and operational costs compared to RFH.
[Mh] Termos MeSH primário: Fenômenos Eletromagnéticos
Recuperação e Remediação Ambiental/métodos
Ferro/farmacologia
Poluentes Químicos da Água/isolamento & purificação
[Mh] Termos MeSH secundário: Halogenação
Calefação/economia
Calefação/métodos
Compostos Orgânicos/química
Polietilenoglicóis
Tricloroetileno
Volatilização
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Organic Chemicals); 0 (Water Pollutants, Chemical); 26183-44-8 (dodecyl polyoxyethylene sulfuric acid); 290YE8AR51 (Trichloroethylene); 30IQX730WE (Polyethylene Glycols); E1UOL152H7 (Iron)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170929
[Lr] Data última revisão:
170929
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170529
[St] Status:MEDLINE


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[PMID]:28527388
[Au] Autor:Li D; Zhu X; Zhong Y; Huang W; Peng P
[Ad] Endereço:State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
[Ti] Título:Abiotic transformation of hexabromocyclododecane by sulfidated nanoscale zerovalent iron: Kinetics, mechanism and influencing factors.
[So] Source:Water Res;121:140-149, 2017 Sep 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Recent studies showed that sulfidated nanoscale zerovalent iron (S-nZVI) is a better reducing agent than nanoscale zerovalen iron (nZVI) alone for reductive dechlorination of several organic solvents such as trichloroethylene (TCE) due to the catalytic role of iron sulfide (FeS). We measured the rates of transformation of hexabromocyclododecane (HBCD) by S-nZVI and compared them to those by FeS, nZVI, and reduced sulfur species. The results showed that: i) HBCD (20 mg L ) was almost completely transformed by S-nZVI (0.5 g L ) within 12 h; ii) the reaction with ß-HBCD was much faster than with α- and γ-HBCD, suggesting the diastereoisomeric selectivity for the reaction by S-nZVI; and iii) the reaction with S-nZVI was 1.4-9.3 times faster than with FeS, S and nZVI, respectively. The study further showed that the HBCD reaction by S-nZVI was likely endothermic, with the optimal solution pH of 5.0, and could be slowed in the presence of Ca , Mg , NO , HCO and Cl , and by increasing ionic strength, solvent content and initial HBCD concentration, or decreasing the S-nZVI dosage. GC-MS analysis showed that tetrabromocyclododecene and dibromocyclododecadiene were the products. XPS spectra indicated that both Fe(II) and S(-II) on the S-nZVI surface were oxidized during the reaction, suggesting that FeS might act as both catalyst and reactant. The study not only demonstrated the superiority of S-nZVI over other well-known reactive reagents, but also provided insight to the mechanisms of the reaction.
[Mh] Termos MeSH primário: Hidrocarbonetos Bromados
Ferro
[Mh] Termos MeSH secundário: Cinética
Tricloroetileno
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons, Brominated); 290YE8AR51 (Trichloroethylene); 5I9835JO3M (hexabromocyclododecane); E1UOL152H7 (Iron)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170521
[St] Status:MEDLINE


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[PMID]:28500890
[Au] Autor:Quan Y; Wu H; Yin Z; Fang Y; Yin C
[Ad] Endereço:Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji 133002, China; Department of Environmental Science, Agricultural College, Yanbian University, Yanji 133002, China.
[Ti] Título:Effect of static magnetic field on trichloroethylene removal in a biotrickling filter.
[So] Source:Bioresour Technol;239:7-16, 2017 Sep.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A laboratory-scale biotrickling filter combined with a magnetic field (MF-BTF) and a single BTF (S-BTF) were set up to treat trichloroethylene (TCE) gas. The influences of phenol alone and NaAc-phenol as co-substrates and different MF intensities were investigated. At low MF intensity, MF-BTF displayed better performance with 0.20g/L of phenol, 53.6-337.1mg/m of TCE, and empty bed residence times of 202.5s. The performances followed the order MF-BTF (60.0mT)>MF-BTF (30.0mT)>S-BTF (0mT)>MF-BTF (130.0mT), and the removal efficiencies (REs) and maximum elimination capacities (ECs) corresponded to: 92.2%-45.5%, 2656.8mg/m h; 89.8%-37.2%, 2169.1mg/m h; 89.8%-29.8%, 1967.7mg/m h; 76.0%-20.8%, 1697.1mg/m h, respectively. High-throughput sequencing indicated that the bacterial diversity was lower, whereas the relative abundances of Acinetobacter, Chryseobacterium, and Acidovorax were higher in MF-BTF. Results confirmed that a proper MF could improve TCE removal performance in BTF.
[Mh] Termos MeSH primário: Reatores Biológicos
Campos Magnéticos
Tricloroetileno
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Filtração
Luz
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
290YE8AR51 (Trichloroethylene)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170514
[St] Status:MEDLINE


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[PMID]:28494362
[Au] Autor:Vickstrom KE; Azizian MF; Semprini L
[Ad] Endereço:School of Chemical, Biological, and Environmental Engineering, 102 Gleeson Hall, Oregon State University, Corvallis, OR 97331, United States.
[Ti] Título:Transformation of carbon tetrachloride and chloroform by trichloroethene respiring anaerobic mixed cultures and supernatant.
[So] Source:Chemosphere;182:65-75, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Carbon tetrachloride (CT) and chloroform (CF) were transformed in batch reactor experiments conducted with anaerobic dechlorinating cultures and supernatant (ADC + S) harvested from continuous flow reactors. The Evanite (EV) and Victoria/Stanford (VS) cultures, capable of respiring trichloroethene (TCE), 1,2-cis-dichloroethene (cDCE), and vinyl chloride (VC) to ethene (ETH), were grown in continuous flow reactors receiving an influent feed of saturated TCE (10 mM; 60 mEq) and formate (45 mM; 90 mEq) but no CT or CF. Cells and supernatant were harvested from the chemostats and inoculated into batch reactors at the onset of each experiment. CT transformation was complete following first order kinetics with CF, DCM and CS as the measurable transformation products, representing 20-40% of the original mass of CT, with CO likely the unknown transformation product. CF was transformed to DCM and likely CO at an order of magnitude rate lower than CT, while DCM was not further transformed. An analytical first order model including multiple key reactions effectively simulated CT transformation, product formation and transformation, and provided reasonable estimates of transformation rate coefficients. Biotic and abiotic treatments indicated that CT was mainly transformed via abiotic processes. However, the presence of live cells was associated with the transformation of CF to DCM. In biotic tests both TCE and CT were simultaneously transformed, with TCE transformed to ETH and approximately 15-53% less CF formed via CT transformation. A 14-day exposure to CF (CF = 1.4 µM) reduced all rates of chlorinated ethene respiration by a factor of 10 or greater.
[Mh] Termos MeSH primário: Bactérias Anaeróbias/metabolismo
Tetracloreto de Carbono/metabolismo
Clorofórmio/metabolismo
Halogenação
Tricloroetileno/metabolismo
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Reatores Biológicos
Etilenos
Formiatos
Cinética
Taxa Respiratória
Cloreto de Vinil
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethylenes); 0 (Formates); 0YIW783RG1 (formic acid); 290YE8AR51 (Trichloroethylene); 7V31YC746X (Chloroform); 91GW059KN7 (ethylene); CL2T97X0V0 (Carbon Tetrachloride); WD06X94M2D (Vinyl Chloride)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170921
[Lr] Data última revisão:
170921
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170512
[St] Status:MEDLINE



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