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[PMID]:28571111
[Au] Autor:Talibov M; Auvinen A; Weiderpass E; Hansen J; Martinsen JI; Kjaerheim K; Tryggvadottir L; Pukkala E
[Ad] Endereço:Faculty of Social Sciences, University of Tampere, Tampere, Finland.
[Ti] Título:Occupational solvent exposure and adult chronic lymphocytic leukemia: No risk in a population-based case-control study in four Nordic countries.
[So] Source:Int J Cancer;141(6):1140-1147, 2017 Sep 15.
[Is] ISSN:1097-0215
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The aim of this study was to assess the effect of occupational solvent exposure on the risk of adult chronic lymphocytic leukemia (CLL). The current case-control study was nested in the Nordic Occupational Cancer Study (NOCCA) cohort. 20,615 CLL cases diagnosed in 1961-2005 in Finland, Iceland, Norway, and Sweden, and 103,075 population-based controls matched by year of birth, sex, and country were included. Occupational histories for cases and controls were obtained from census records in 1960, 1970, 1980/1981, and 1990. Exposure to selected solvents was estimated by using the NOCCA job-exposure matrix (NOCCA-JEM). Odds ratios (OR) and 95% confidence intervals (95% CI) were estimated by using conditional logistic regression models. Overall, nonsignificant CLL risk elevations were observed for methylene chloride, perchloroethylene, and 1,1,1-trichloroethane. Compared to unexposed, significantly increased risks were observed for cumulative perchloroethylene exposure ≤13.3 ppm-years (OR = 1.85, 95% CI 1.16-2.96) and average life-time perchloroethylene exposure ≤2.5 ppm (1.61, 95% CI 1.01-2.56) among women, and cumulative methylene chloride exposure ≤12.5 ppm-years (OR = 1.19, 95% CI 1.01-1.41) and 12.5-74.8 ppm-years (OR = 1.23, 95% CI 1.01-1.51) among men in an analysis with 5 years lag-time, though without dose-response pattern. Decreased CLL risk was observed for aliphatic and alicyclic hydrocarbon solvents and toluene. This study did not support associations for solvent exposure and CLL. Observed weak associations for methylene chloride, perchloroethylene, 1,1,1-trichloroethane exposures, aliphatic and alicyclic hydrocarbons and toluene were not consistent across sexes, and showed no gradient with amount of exposure.
[Mh] Termos MeSH primário: Hidrocarbonetos Clorados/envenenamento
Leucemia Linfocítica Crônica de Células B/epidemiologia
Doenças Profissionais/epidemiologia
Exposição Ocupacional/estatística & dados numéricos
[Mh] Termos MeSH secundário: Idoso
Estudos de Casos e Controles
Estudos de Coortes
Feminino
Seres Humanos
Leucemia Linfocítica Crônica de Células B/induzido quimicamente
Masculino
Cloreto de Metileno/envenenamento
Doenças Profissionais/induzido quimicamente
Exposição Ocupacional/efeitos adversos
Risco
Países Escandinavos e Nórdicos/epidemiologia
Tetracloroetileno/envenenamento
Tricloroetanos/envenenamento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons, Chlorinated); 0 (Trichloroethanes); 113C650IR1 (1,1,1-trichloroethane); 588X2YUY0A (Methylene Chloride); TJ904HH8SN (Tetrachloroethylene)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171002
[Lr] Data última revisão:
171002
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170602
[St] Status:MEDLINE
[do] DOI:10.1002/ijc.30814


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[PMID]:28126048
[Au] Autor:Key TA; Bowman KS; Lee I; Chun J; Albuquerque L; da Costa MS; Rainey FA; Moe WM
[Ad] Endereço:1​Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
[Ti] Título:Dehalogenimonas formicexedens sp. nov., a chlorinated alkane-respiring bacterium isolated from contaminated groundwater.
[So] Source:Int J Syst Evol Microbiol;67(5):1366-1373, 2017 May.
[Is] ISSN:1466-5034
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A strictly anaerobic, Gram-stain-negative, non-spore-forming bacterium designated NSZ-14T, isolated from contaminated groundwater in Louisiana (USA), was characterized using a polyphasic approach. Strain NSZ-14T reductively dehalogenated a variety of polychlorinated aliphatic alkanes, producing ethene from 1,2-dichloroethane, propene from 1,2-dichloropropane, a mixture of cis- and trans-1,2-dichloroethene from 1,1,2,2-tetrachloroethane, vinyl chloride from 1,1,2-trichloroethane and allyl chloride (3-chloro-1-propene) from 1,2,3-trichloropropane. Formate or hydrogen could both serve as electron donors. Dechlorination occurred between pH 5.5 and 7.5 and over a temperature range of 20-37 °C. Major cellular fatty acids included C18 : 1ω9c, C14 : 0 and C16 : 0. 16S rRNA gene sequence-based phylogenetic analysis indicated that the strain clusters within the class Dehalococcoidia of the phylum Chloroflexi, most closely related to but distinct from type strains of the species Dehalogenimonas alkenigignens (97.63 % similarity) and Dehalogenimonas lykanthroporepellens (95.05 %). A complete genome sequence determined for strain NSZ-14T revealed a DNA G+C content of 53.96 mol%, which was corroborated by HPLC (54.1±0.2 mol% G+C). Genome-wide comparisons based on average nucleotide identity by orthology and estimated DNA-DNA hybridization values combined with phenotypic and chemotaxonomic traits and phylogenetic analysis indicate that strain NSZ-14T represents a novel species within the genus Dehalogenimonas, for which the name Dehalogenimonas formicexedens sp. nov. is proposed. The type strain is NSZ-14T (=HAMBI 3672T=JCM 19277T=VKM B-3058T). An emended description of Dehalogenimonas alkenigignens is also provided.
[Mh] Termos MeSH primário: Chloroflexi/classificação
Água Subterrânea/microbiologia
Filogenia
[Mh] Termos MeSH secundário: Alcanos
Técnicas de Tipagem Bacteriana
Composição de Bases
Chloroflexi/genética
Chloroflexi/isolamento & purificação
DNA Bacteriano/genética
Etano/análogos & derivados
Dicloretos de Etileno
Ácidos Graxos/química
Halogenação
Hidrocarbonetos Clorados
Louisiana
Propano/análogos & derivados
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Tricloroetanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alkanes); 0 (DNA, Bacterial); 0 (Ethylene Dichlorides); 0 (Fatty Acids); 0 (Hydrocarbons, Chlorinated); 0 (RNA, Ribosomal, 16S); 0 (Trichloroethanes); 113C650IR1 (1,1,1-trichloroethane); 1L6BI049XV (1,1,2,2-tetrachloroethane); 28E9ERN9WU (1,1,2-trichloroethane); 31UK5E8W7C (tetrachloroethane); 3MJ7QCK0Z0 (1,2,3-trichloropropane); 55163IJI47 (ethylene dichloride); L99N5N533T (Ethane); RRZ023OFWL (propylene dichloride); T75W9911L6 (Propane)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170128
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.001819


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[PMID]:27898326
[Au] Autor:Li H; Qiu YF; Wang XL; Yang J; Yu YJ; Chen YQ; Liu YD
[Ad] Endereço:State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, State Key Laboratory of Bioreactor Engineering, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
[Ti] Título:Biochar supported Ni/Fe bimetallic nanoparticles to remove 1,1,1-trichloroethane under various reaction conditions.
[So] Source:Chemosphere;169:534-541, 2017 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, Ni/Fe nanoparticles supported by biochar to stimulate the reduction of 1,1,1-trichloroethane (1,1,1-TCA) in groundwater remediation was investigated. In order to enhance the reactivity of ZVI (zero valent iron) nanoparticles, surface modification of ZVI was performed using nickel and biochar. The removal efficiency of 1,1,1-TCA increased from 42.3% to 99.3% as the biochar-to-Ni/Fe mass ratio increased from 0 to 1.0. However a higher biochar-to-Ni/Fe ratio showed little difference in the 1,1,1-TCA degradation efficiency. In the presence of Ni, atomic hydrogen generated by ZVI corrosion could be absorbed in the metal additive's lattice and then produce a hydride-like species (H) that represented the primary redox-active entity. The effects of various factors were evaluated, including pH, humic acid (HA) and inorganic matters (Cl , CO , HCO , NO and SO ). The degradation of 1,1,1-TCA was greatly affected by pH. The presence of Cl , CO , HCO and SO had negligible effects, but NO and HA showed a significant inhibitory effects on 1,1,1-TCA degradation. In conclusion, biochar supported Ni/Fe nanoparticles could be highly effective for 1,1,1-TCA degradation.
[Mh] Termos MeSH primário: Carvão Vegetal/química
Ferro/química
Nanopartículas/química
Níquel/química
Tricloroetanos/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Adsorção
Cromatografia Gasosa
Recuperação e Remediação Ambiental
Água Subterrânea/química
Substâncias Húmicas/análise
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Humic Substances); 0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 0 (biochar); 113C650IR1 (1,1,1-trichloroethane); 16291-96-6 (Charcoal); 7OV03QG267 (Nickel); E1UOL152H7 (Iron)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170123
[Lr] Data última revisão:
170123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161130
[St] Status:MEDLINE


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[PMID]:27830359
[Au] Autor:Wang W; Wu Y; Zhang C
[Ad] Endereço:School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
[Ti] Título:High-density natural luffa sponge as anaerobic microorganisms carrier for degrading 1,1,1-TCA in groundwater.
[So] Source:Bioprocess Biosyst Eng;40(3):383-393, 2017 Mar.
[Is] ISSN:1615-7605
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Anaerobic microorganisms were applied to degrade organic contaminants in groundwater with permeable reactive barriers (PRBs). However, anaerobic microorganisms need to select optimal immobilizing material as carrier. The potential of high-density natural luffa sponge (HDLS) (a new variety of luffa) for the immobilization and protection of anaerobic microorganisms was investigated. The HDLS has a dense structure composed of a complicated interwoven fibrous network. Therefore, the abrasion rate of HDLS (0.0068 g s ) was the smallest among the four carriers [HDLS, ordinary natural luffa sponge (OLS), polyurethane sponge (PS), and gel carrier AQUAPOROUSGEL (APG)]. The results suggest that it also had the greatest water retention (10.26 H O-g dry carrier-g ) and SS retention (0.21 g dry carrier-g ). In comparison to well-established commercialized gel carrier APG, HDLS was of much better mechanical strength, hydrophilicity and stability. Microbial-immobilized HDLS also had the best performance for the remediation of 1,1,1-TCA simulated groundwater. Analysis of the clone libraries from microorganism-immobilized HDLS showed the HDLS could protect microorganisms from the toxicity of 1,1,1-TCA and maintain the stability of microbial community diversity. The mechanism of HDLS immobilizing and protecting microorganisms was proposed as follows. The HDLS had a micron-scale honeycomb structure (30-40 µm) and an irregular ravine structure (4-20 µm), which facilitate the immobilization of anaerobic microorganisms and protect the anaerobic microorganisms.
[Mh] Termos MeSH primário: Enzimas Imobilizadas/química
Água Subterrânea
Tricloroetanos/química
Microbiologia da Água
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Anaerobiose
Biodegradação Ambiental
Interações Hidrofóbicas e Hidrofílicas
Luffa
Microbiota
Microscopia Eletrônica de Varredura
Poliuretanos/química
Água/química
Poluentes Químicos da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Enzymes, Immobilized); 0 (Polyurethanes); 0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 113C650IR1 (1,1,1-trichloroethane)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170317
[Lr] Data última revisão:
170317
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161111
[St] Status:MEDLINE
[do] DOI:10.1007/s00449-016-1706-6


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[PMID]:27783109
[Au] Autor:Wang W; Wu Y
[Ad] Endereço:School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
[Ti] Título:Combination of zero-valent iron and anaerobic microorganisms immobilized in luffa sponge for degrading 1,1,1-trichloroethane and the relevant microbial community analysis.
[So] Source:Appl Microbiol Biotechnol;101(2):783-796, 2017 Jan.
[Is] ISSN:1432-0614
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:1,1,1-Trichloroethane (1,1,1-TCA), a dense non-aqueous phase liquid (DNAPL), is relatively slow to remediate naturally; combination of zero-valent iron and immobilized microorganism is a potential means to accelerate DNAPL biodegradation. We first adopted high density luffa sponge (HDLS) as immobilized microorganism carrier. The experimental results demonstrated that (1) the supernatant liquid microorganisms were the optimal immobilized microorganisms for HDLS and (2) the combination of zero-valent iron and immobilized microorganisms accelerated 1,1,1-TCA transformation. Furthermore, in the long-term remediation process, anaerobic microorganisms produced reductant H S which was beneficial to zero-valent iron PRBs. Through further study of the microbial community, we found that majority of the sulfate-reducing bacteria (SRB) perfectly adapted to the process of 1,1,1-TCA co-metabolism dechlorination. Desulfobulbus and Desulfococcus potentially were the special SRB that contributed significantly to TCA co-metabolism. Additionally, 1,1,1-TCA induced the generation of new SRB and stimulated the growth of majority of dominating methanogens. The results indicated that they played a constructive role in accelerating the dechlorination of 1,1,1-TCA, reduction of sulfate, and improving the production of CH . Consequently, combination of zero-valent iron and immobilized microorganisms for remediating groundwater by contaminated 1,1,1-TCA is a sustainable and green remediation technology. Especially for groundwater of SO type contaminated by 1,1,1-TCA, in the long-term course of combination degradation, cyclic utilization of H S to prolong the service life of zero-valent iron PRBs. H and CH generated to capture as potential energy resource. Based on this, a tentative reaction mechanism for Fe biodegradation of 1,1,1-TCA was proposed.
[Mh] Termos MeSH primário: Bactérias Anaeróbias/metabolismo
Biota
Células Imobilizadas/metabolismo
Água Subterrânea/química
Água Subterrânea/microbiologia
Ferro/metabolismo
Tricloroetanos/metabolismo
[Mh] Termos MeSH secundário: Anaerobiose
Biotransformação
Recuperação e Remediação Ambiental/métodos
Sulfeto de Hidrogênio/metabolismo
Metano/metabolismo
Poluentes Químicos da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 113C650IR1 (1,1,1-trichloroethane); E1UOL152H7 (Iron); OP0UW79H66 (Methane); YY9FVM7NSN (Hydrogen Sulfide)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170117
[Lr] Data última revisão:
170117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161027
[St] Status:MEDLINE
[do] DOI:10.1007/s00253-016-7933-6


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[PMID]:27023817
[Au] Autor:Danish M; Gu X; Lu S; Naqvi M
[Ad] Endereço:State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
[Ti] Título:Degradation of chlorinated organic solvents in aqueous percarbonate system using zeolite supported nano zero valent iron (Z-nZVI) composite.
[So] Source:Environ Sci Pollut Res Int;23(13):13298-307, 2016 Jul.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Chlorinated organic solvents (COSs) are extensively detected in contaminated soil and groundwater that pose long-term threats to human life and environment. In order to degrade COSs effectively, a novel catalytic composite of natural zeolite-supported nano zero valent iron (Z-nZVI) was synthesized in this study. The performance of Z-nZVI-catalyzed sodium percarbonate (SPC) in a heterogeneous Fenton-like system was investigated for the degradation of COSs such as 1,1,1-trichloroethane (1,1,1-TCA) and trichloroethylene (TCE). The surface characteristics and morphology of the Z-nZVI composite were tested using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Total pore volume, specific surface area, and pore size of the natural zeolite and the Z-nZVI composite were measured using Brunauer-Emmett-Teller (BET) method. SEM and TEM analysis showed significant elimination of aggregation and well dispersion of iron nano particles on the framework of natural zeolite. The BET N2 measurement analysis indicated that the surface area of the Z-nZVI composite was 72.3 m(2)/g, much larger than that of the natural zeolite (0.61 m(2)/g). For the contaminant analysis, the samples were extracted with n-hexane and analyzed through gas chromatograph. The degradation of 1,1,1-TCA and TCE in the Z-nZVI-catalyzed percarbonate system were 48 and 39 % respectively, while strong augmentation was observed up to 83 and 99 %, respectively, by adding the reducing agent (RA), hydroxyl amine (NH2OH•HCl). Probe tests validated the presence of OH(●) and O2 (●-) which were responsible for 1,1,1-TCA and TCE degradation, whereas both free radicals were strengthened with the addition of RA. In conclusion, the Z-nZVI/SPC oxidation with reducing agent shows potential technique for degradation of groundwater contaminated by 1,1,1-TCA and TCE.
[Mh] Termos MeSH primário: Carbonatos/química
Ferro/química
Tricloroetanos/química
Tricloroetileno/química
Poluentes Químicos da Água/química
Zeolitas/química
[Mh] Termos MeSH secundário: Recuperação e Remediação Ambiental
Água Subterrânea
Hexanos/química
Microscopia Eletrônica de Varredura
Microscopia Eletrônica de Transmissão
Solventes/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbonates); 0 (Hexanes); 0 (Solvents); 0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 113C650IR1 (1,1,1-trichloroethane); 1318-02-1 (Zeolites); 290YE8AR51 (Trichloroethylene); 2DDG612ED8 (n-hexane); E1UOL152H7 (Iron); Z7G82NV92P (sodium percarbonate)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:171103
[Lr] Data última revisão:
171103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160330
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-016-6488-5


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[PMID]:27016888
[Au] Autor:Fang SM; Zhang X; Bao LJ; Zeng EY
[Ad] Endereço:State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
[Ti] Título:Modeling the fate of p,p'-DDT in water and sediment of two typical estuarine bays in South China: Importance of fishing vessels' inputs.
[So] Source:Environ Pollut;212:598-604, 2016 May.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Antifouling paint applied to fishing vessels is the primary source of dichloro-diphenyl-trichloroethane (DDT) to the coastal marine environments of China. With the aim to provide science-based support of potential regulations on DDT use in antifouling paint, we utilized a fugacity-based model to evaluate the fate and impact of p,p'-DDT, the dominant component of DDT mixture, in Daya Bay and Hailing Bay, two typical estuarine bays in South China. The emissions of p,p'-DDT from fishing vessels to the aquatic environments of Hailing Bay and Daya Bay were estimated as 9.3 and 7.7 kg yr(-1), respectively. Uncertainty analysis indicated that the temporal variability of p,p'-DDT was well described by the model if fishing vessels were considered as the only direct source, i.e., fishing vessels should be the dominant source of p,p'-DDT in coastal bay areas of China. Estimated hazard quotients indicated that sediment in Hailing Bay posed high risk to the aquatic system, and it would take at least 21 years to reduce the hazards to a safe level. Moreover, p,p'-DDT tends to migrate from water to sediment in the entire Hailing Bay and Daya Bay. On the other hand, our previous research indicated that p,p'-DDT was more likely to migrate from sediment to water in the maricultured zones located in shallow waters of these two bays, where fishing vessels frequently remain. These findings suggest that relocating mariculture zones to deeper waters would reduce the likelihood of farmed fish contamination by p,p'-DDT.
[Mh] Termos MeSH primário: Baías
DDT/química
Monitoramento Ambiental
Estuários
Poluentes Químicos da Água/química
[Mh] Termos MeSH secundário: Animais
China
Peixes
Sedimentos Geológicos/análise
Pintura/análise
Tricloroetanos
Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 113C650IR1 (1,1,1-trichloroethane); CIW5S16655 (DDT)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170904
[Lr] Data última revisão:
170904
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160328
[St] Status:MEDLINE


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[PMID]:26970344
[Au] Autor:Wong YK; Holland SI; Ertan H; Manefield M; Lee M
[Ad] Endereço:School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, Australia.
[Ti] Título:Isolation and characterization of Dehalobacter sp. strain UNSWDHB capable of chloroform and chlorinated ethane respiration.
[So] Source:Environ Microbiol;18(9):3092-105, 2016 Sep.
[Is] ISSN:1462-2920
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Dehalobacter sp. strain UNSWDHB can dechlorinate up to 4 mM trichloromethane at a rate of 0.1 mM per day to dichloromethane and 1,1,2-trichloroethane (1 mM, 0.1 mM per day) with the unprecedented product profile of 1,2-dichloroethane and vinyl chloride. 1,1,1-trichloroethane and 1,1-dichloroethane were slowly utilized by strain UNSWDHB and were not completely removed, with minimum threshold concentrations of 0.12 mM and 0.07 mM respectively under growth conditions. Enzyme kinetic experiments confirmed strong substrate affinity for trichloromethane and 1,1,2-trichloroethane (Km = 30 and 62 µM respectively) and poor substrate affinity for 1,1,1-trichloroethane and 1,1-dichloroethane (Km = 238 and 837 µM respectively). Comparison of enzyme kinetic and growth data with other trichloromethane respiring organisms (Dehalobacter sp. strain CF and Desulfitobacterium sp. strain PR) suggests an adaptation of strain UNSWDHB to trichloromethane. The trichloromethane RDase (TmrA) expressed by strain UNSWDHB was identified by BN-PAGE and functionally characterized. Amino acid comparison of homologous RDases from all three organisms revealed only six significant amino acid substitutions/deletions, which are likely to be crucial for substrate specificity. Furthermore, strain UNSWDHB was shown to grow without exogenous supply of cobalamin confirming genomic-based predictions of a fully functional cobalamin synthetic pathway.
[Mh] Termos MeSH primário: Clorofórmio/metabolismo
Etano/metabolismo
Peptococcaceae/metabolismo
[Mh] Termos MeSH secundário: Dicloretos de Etileno/metabolismo
Halogenação
Cloreto de Metileno/metabolismo
Peptococcaceae/genética
Peptococcaceae/isolamento & purificação
Tricloroetanos/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethylene Dichlorides); 0 (Trichloroethanes); 113C650IR1 (1,1,1-trichloroethane); 28E9ERN9WU (1,1,2-trichloroethane); 55163IJI47 (ethylene dichloride); 588X2YUY0A (Methylene Chloride); 7V31YC746X (Chloroform); L99N5N533T (Ethane)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160313
[St] Status:MEDLINE
[do] DOI:10.1111/1462-2920.13287


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[PMID]:26934432
[Au] Autor:Patterson BM; Lee M; Bastow TP; Wilson JT; Donn MJ; Furness A; Goodwin B; Manefield M
[Ad] Endereço:CSIRO Land and Water Flagship, Private Bag No. 5, Wembley, WA 6913, Australia; School of Chemistry and Biochemistry, University of Western Australia, Crawley, WA 6009, Australia. Electronic address: bradley.patterson@csiro.au.
[Ti] Título:Concentration effects on biotic and abiotic processes in the removal of 1,1,2-trichloroethane and vinyl chloride using carbon-amended ZVI.
[So] Source:J Contam Hydrol;188:1-11, 2016 May.
[Is] ISSN:1873-6009
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A permeable reactive barrier, consisting of both zero valent iron (ZVI) and a biodegradable organic carbon, was evaluated for the remediation of 1,1,2-trichloroethane (1,1,2-TCA) contaminated groundwater. During an 888 day laboratory column study, degradation rates initially stabilized with a degradation half-life of 4.4±0.4 days. Based on the accumulation of vinyl chloride (VC) and limited production of 1,1-dichloroethene (1,1-DCE) and 1,2-dichloroethane (1,2-DCA), the dominant degradation pathway was likely abiotic dichloroelimination to form VC. Degradation of VC was not observed based on the accumulation of VC and limited ethene production. After a step reduction in the influent concentration of 1,1,2-TCA from 170±20 mg L(-1) to 39±11 mg L(-1), the degradation half-life decreased 5-fold to 0.83±0.17 days. The isotopic enrichment factor of 1,1,2-TCA also changed after the step reduction from -14.6±0.7‰ to -0.72±0.12‰, suggesting a possible change in the degradation mechanism from abiotic reductive degradation to biodegradation. Microbiological data suggested a co-culture of Desulfitobacterium and Dehalococcoides was responsible for the biodegradation of 1,1,2-TCA to ethene.
[Mh] Termos MeSH primário: Carbono/química
Ferro/química
Tricloroetanos/análise
Cloreto de Vinil/análise
Poluentes Químicos da Água/análise
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Chloroflexi/crescimento & desenvolvimento
Desulfitobacterium/crescimento & desenvolvimento
Água Subterrânea/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 28E9ERN9WU (1,1,2-trichloroethane); 7440-44-0 (Carbon); E1UOL152H7 (Iron); WD06X94M2D (Vinyl Chloride)
[Em] Mês de entrada:1611
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160303
[St] Status:MEDLINE


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[PMID]:26874254
[Au] Autor:Palau J; Jamin P; Badin A; Vanhecke N; Haerens B; Brouyère S; Hunkeler D
[Ad] Endereço:University of Neuchâtel, Centre for Hydrogeology and Geothermics (CHYN), Building UniMail, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland; Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Jordi Girona 18-26, Barcelona 08034, Spain. Electronic address: jordi.palau@ub.edu.
[Ti] Título:Use of dual carbon-chlorine isotope analysis to assess the degradation pathways of 1,1,1-trichloroethane in groundwater.
[So] Source:Water Res;92:235-43, 2016 Apr 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Compound-specific isotope analysis (CSIA) is a powerful tool to track contaminant fate in groundwater. However, the application of CSIA to chlorinated ethanes has received little attention so far. These compounds are toxic and prevalent groundwater contaminants of environmental concern. The high susceptibility of chlorinated ethanes like 1,1,1-trichloroethane (1,1,1-TCA) to be transformed via different competing pathways (biotic and abiotic) complicates the assessment of their fate in the subsurface. In this study, the use of a dual C-Cl isotope approach to identify the active degradation pathways of 1,1,1-TCA is evaluated for the first time in an aerobic aquifer impacted by 1,1,1-TCA and trichloroethylene (TCE) with concentrations of up to 20 mg/L and 3.4 mg/L, respectively. The reaction-specific dual carbon-chlorine (C-Cl) isotope trends determined in a recent laboratory study illustrated the potential of a dual isotope approach to identify contaminant degradation pathways of 1,1,1-TCA. Compared to the dual isotope slopes (Δδ(13)C/Δδ(37)Cl) previously determined in the laboratory for dehydrohalogenation/hydrolysis (DH/HY, 0.33 ± 0.04) and oxidation by persulfate (∞), the slope determined from field samples (0.6 ± 0.2, r(2) = 0.75) is closer to the one observed for DH/HY, pointing to DH/HY as the predominant degradation pathway of 1,1,1-TCA in the aquifer. The observed deviation could be explained by a minor contribution of additional degradation processes. This result, along with the little degradation of TCE determined from isotope measurements, confirmed that 1,1,1-TCA is the main source of the 1,1-dichlorethylene (1,1-DCE) detected in the aquifer with concentrations of up to 10 mg/L. This study demonstrates that a dual C-Cl isotope approach can strongly improve the qualitative and quantitative assessment of 1,1,1-TCA degradation processes in the field.
[Mh] Termos MeSH primário: Cloro/química
Água Subterrânea/química
Marcação por Isótopo/métodos
Tricloroetanos/química
[Mh] Termos MeSH secundário: Isótopos de Carbono
Halogenação
Hidrocarbonetos/análise
Tricloroetileno/análise
Poluentes Químicos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Carbon Isotopes); 0 (Hydrocarbons); 0 (Trichloroethanes); 0 (Water Pollutants, Chemical); 113C650IR1 (1,1,1-trichloroethane); 290YE8AR51 (Trichloroethylene); 4R7X1O2820 (Chlorine)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160214
[St] Status:MEDLINE



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