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Gabriela T Niño de Guzmán, Cathleen J Hapeman, Patricia D Millner, Laura L McConnell, Dana Jackson, David Kindig, Alba Torrents
Trichloroethylene (TCE) is a highly effective industrial degreasing agent and known carcinogen. It was frequently buried improperly in landfills and has subsequently become one of the most common groundwater and soil contaminants in the USA. A common strategy to remediate TCE-contaminated sites and to prevent movement of the TCE plumes into waterways is to construct biowalls which consist of biomaterials and amendments to enhance biodegradation. This approach was chosen to contain a TCE plume emanating from a closed landfill in Maryland...
January 11, 2018: Environmental Science and Pollution Research International
Alondra P Harris, Kareem A Ismail, Martha Nunez, Ira Martopullo, Alejandro Lencinas, Ornella I Selmin, Raymond B Runyan
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...
January 3, 2018: Toxicology Letters
H P Ye, J Shao, S W Tan, X Y Shan, Y P Shi
Objective: To establish a method for determing the trichloroethylene(TCE)and trichloroethanol(TCOH)in blood samples by liquid-liquid extraction-gas chromatography with electron capture detector. Methods: With this method,ether was used as extraction solvent and trichloromethane was used as an internal standard. The whole blood sample was extracted with ether, and dehydrated by anhydrous sodium sulfate. Then the analytes were separated on HP-5 capillary column(30m×0.32mm×0.15μm)and detected byECD.The retention time was for qualitative analysis and the internal standard was for quantitation...
October 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
William James Blanford, Michael Philip Pecoraro, Rebecca Heinrichs, Thomas Bernhard Boving
In a field study, aqueous cyclodextrin (CD) was investigated for its ability to extract chlorinated volatile organic compounds (cVOC), such as trichloroethylene (TCE), 1,1,1-trichloroethane (TCA), and dichloroethene (DCE) through in-situ flushing of a sandy aquifer. After cessation of aquifer flushing, a plume of CD was left. Changes in CD, cVOC, and inorganic terminal electron acceptors (TEAs) (DO, nitrate, sulfate, iron) were monitored in four rounds of wellwater sampling (20, 210, 342, and 425days after cessation of active pumping)...
November 14, 2017: Journal of Contaminant Hydrology
R Firdous, J F Devlin
To gain insight into the processes of transformations in zero-valent iron systems, electrolytic iron (EI) has been used as a surrogate for the commercial products actually used in barriers. This substitution facilitates mechanistic studies, but may not be fully representative of all the relevant processes at work in groundwater remediation. To address this concern, the kinetic iron model (KIM) was used to investigate sorption and reactivity differences between EI and Connelly brand GI, using TCE as a probe compound...
December 17, 2017: Journal of Hazardous Materials
Si-Hyun Do, Se-Hee Jo, Ji Soo Roh, Hye Jin Im, Ho Bum Park, Bill Batchelor
A kinetic model for the competitions was applied to understand the reductive dechlorination of tertiary DNAPL mixtures containing PCE, TCE, and 1,1,1-TCA. The model assumed that the mass transfer rates were sufficiently rapid that the target compounds in the solution and the DNAPL mixture were in phase equilibrium. Dechlorination was achieved using either a mixture of Fe(II), Fe(III), and Ca(OH)2 (Fe(II/III)-L) or a mixture of Fe(II) and Portland cement (Fe(II)-C). PCE in the DNAPL mixtures was gradually reduced and it was reduced more rapidly using Fe(II)-C than Fe(II/III)-L...
December 20, 2017: Science of the Total Environment
Satoko Morishima, Takashi Shiina, Shingo Suzuki, Seishi Ogawa, Aiko Sato-Otsubo, Koichi Kashiwase, Fumihiro Azuma, Toshio Yabe, Masahiro Satake, Shunichi Kato, Yoshihisa Kodera, Takehiko Sasazuki, Yasuo Morishima
HLA-DPB1 T-cell epitope (TCE) mismatching algorithm and rs9277534 SNP at the 3' untranslated region (3' UTR) in the HLA-DPB1 gene are key factors for transplant-related events in unrelated hematopoietic cell transplantation (UR-HCT). However, the association of these two mechanisms has not been elucidated. We analyzed 19 frequent HLA-DPB1 alleles derived from Japanese healthy subjects by next-generation sequencing (NGS) of the entire HLA-DPB1 gene region and multi-SNP data of the HLA region in 1589 UR-HCT pairs...
December 15, 2017: Blood
Ilia Rodushkin, Cora Paulukat, Simon Pontér, Emma Engström, Douglas C Baxter, Dieke Sörlin, Nicola Pallavicini, Katerina Rodushkina
The performance of double focusing, sector field mass spectrometry (ICP-SFMS) for determination of analytes, including technology critical elements (TCE), at ultra-trace levels in environmental and clinical matrices was critically evaluated. Different configurations of the ICP-SFMS introduction system as well as various sample preparations, pre-concentration and matrix separation methods were employed and compared. Factors affecting detection capabilities and accuracy of data produced (instrumental sensitivity, contamination risks, purity of reagents, spectral interferences, matrix effects, analyte recovery and losses) were discussed...
December 4, 2017: Science of the Total Environment
Ju Young Kim, Hyeong Min Jin, Seong-Jun Jeong, Taeyong Chang, Bong Hoon Kim, Seung Keun Cha, Jun Soo Kim, Dong Ok Shin, Jin Young Choi, Jang Hwan Kim, Geon Gug Yang, Suwan Jeon, Young-Gi Lee, Kwang Man Kim, Jonghwa Shin, Sang Ouk Kim
Transparent conducting electrodes (TCEs) are essential components in various optoelectronic devices. Nanostructured metallic thin film is one of the promising candidates to complement current metal oxide films, such as ITO, where high cost rare earth elements have been a longstanding issue. Herein, we present that multiscale porous metal nanomesh thin films prepared by bimodal self-assembly of block copolymer (BCP)/homopolymer blends may offer a new opportunity for TCE. This hierarchical concurrent self-assembly consists of macrophase separation between BCP and homopolymer as well as microphase separation of BCP, and thus provides a straightforward spontaneous production of a highly porous multiscale pattern over an arbitrary large area...
December 6, 2017: Nanoscale
Chih-Ping Tso, Yang-Hsin Shih
Zerovalent iron (ZVI) based technology has been applied to remediate contaminated groundwater and has been paid great attention as an economic alternative. But it is still remains highly challenging to remove chlorinated pollutants such as trichloroethylene (TCE) with ZVI. Low molecular weight carboxylic ligands (formic acid (FA), oxalic acid (OA), and citric acid (CA)) were chosen to study the influence on the performance of ZVI in groundwater, including the morphology of Fe surface and the Fe dissolution...
November 30, 2017: Journal of Environmental Management
Wei Wang, Xingyu Liu, Kerui Li, Tielong Li
Dehalococcoides spp. were extensively studied and applied to in-situ trichloroethylene (TCE) remediation since it is the only genus that can reduce TCE to harmless ethene completely. However, this technology was hindered because of the requirement of electron donor (i.e. hydrogen or fermentable organic substrate). Considering the spontaneous electric field and in-situ hydrogen production capacity of tourmaline, this mineral was used as an environmental-friendly bio-promoter for dechlorinating mixed culture containing Dehalococcoides spp...
November 20, 2017: Chemosphere
Yu-Syuan Luo, Shinji Furuya, Weihsueh Chiu, Ivan Rusyn
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...
November 30, 2017: Journal of Toxicology and Environmental Health. Part A
Suhrit Ghosh, Goutam Ghosh, Mithun Paul, Tsuneaki Sakurai, Wakana Matsuda, Shu Seki
Self-assembly of a few 1,3-dihydroxyl functionalized naphthalene diimide (NDI) derivatives is reported with particular emphasis on the impact of chirality on gelation and effect of self-assembly on electrical conductivity. (R)-NDI, devoid of any alkyl chains, exhibits gelation in TCE by a ladder like H-bonded chain formation between the 1,3-dihydroxyl group leading to the fibrillar structures with preferential helicity. The (S)- isomer also exhibits identical gelation but produces fibrils with the opposite handedness...
November 27, 2017: Chemistry: a European Journal
Ursula Karges, Johannes Becker, Wilhelm Püttmann
An effective and sensitive method for the analysis of 1,4-dioxane in water has been available since 2008 (EPA 522). This method is increasingly being applied to investigate the distribution of 1,4-dioxane in the aquatic environment. However, there is a need for more information about the possible occurrence of 1,4-dioxane in groundwater in Europe in general, and in Germany in particular, where virtually no data have been collected so far. The possible contamination of groundwater with 1,4-dioxane is of relevance to Germany because up to 70% of Germany's drinking water is obtained from groundwater and about 17% from river bank filtrate, which contains variable proportions of groundwater...
November 19, 2017: Science of the Total Environment
Mohammadyousef Roghani, Olivia P Jacobs, Anthony Miller, Evan J Willett, James A Jacobs, C Ricardo Viteri, Elham Shirazi, Kelly G Pennell
Sewer systems have been recently recognized as potentially important exposure pathways to consider during vapor intrusion assessments; however, this pathway has not been well-characterized and there is need for additional information about the occurrence of volatile organic compounds (VOCs) in sewer systems. This paper reports the results of sewer gas sampling conducted in a sanitary sewer over the years of 2014-2017. Sewer gas samples were collected and analyzed using several different techniques, including TO-15 (grab), TO-17 (passive), Radiello® (passive) and a novel continuous monitoring technique, the Autonomous Rugged Optical Multigas Analyzer (AROMA)...
November 13, 2017: Science of the Total Environment
Kathleen M Gilbert, Sarah J Blossom, Brad Reisfeld, Stephen W Erickson, Kanan Vyas, Mary Maher, Brannon Broadfoot, Kirk West, Shasha Bai, Craig A Cooney, Sudeepa Bhattacharyya
Exposure to industrial solvent and water pollutant trichloroethylene (TCE) can promote autoimmunity, and expand effector/memory (CD62L) CD4(+) T cells. In order to better understand etiology reduced representation bisulfite sequencing was used to study how a 40-week exposure to TCE in drinking water altered methylation of ∼337 770 CpG sites across the entire genome of effector/memory CD4(+) T cells from MRL+/+ mice. Regardless of TCE exposure, 62% of CpG sites in autosomal chromosomes were hypomethylated (0-15% methylation), and 25% were hypermethylated (85-100% methylation)...
July 2017: Environmental Epigenetics
Elana R Elkin, Sean M Harris, Rita Loch-Caruso
Trichloroethylene (TCE), a prevalent environmental contaminant, is a potent renal and hepatic toxicant through metabolites such as S-(1, 2-dichlorovinyl)-l-cysteine (DCVC). However, effects of TCE on other target organs such as the placenta have been minimally explored. Because elevated apoptosis and lipid peroxidation in placenta have been observed in pregnancy morbidities involving poor placentation, we evaluated the effects of DCVC exposure on apoptosis and lipid peroxidation in a human extravillous trophoblast cell line, HTR-8/SVneo...
November 10, 2017: Toxicology and Applied Pharmacology
Li-Zhi Huang, Zhou Yin, Nicola G A Cooper, Weizhao Yin, Emil Tveden Bjerglund, Bjarne W Strobel, Hans Christian B Hansen
A layered Fe(II)-Fe(III) hydroxide (green rust, GR) was intercalated with dodecanoate (known as GRC12) and then amended with Cu(II) (GRC12(Cu)) before reaction with chloroform (CF), carbon tetrachloride (CT), trichloroethylene (TCE) or tetrachloroethylene (PCE). Reduction of CT by GRC12(Cu) was 37 times faster than with GRC12 alone before the active Cu species was consumed. The Cu mediated reaction followed the dichloroelimination pathway as observed for GRC12 alone, with carbon monoxide (82.5%) and formate (26...
November 6, 2017: Journal of Hazardous Materials
Milica Velimirovic, Melanie Auffan, Luca Carniato, Vesna Micić Batka, Doris Schmid, Stephan Wagner, Daniel Borschneck, Olivier Proux, Frank von der Kammer, Thilo Hofmann
Milled zerovalent iron (milled ZVI) particles have been recognized as a promising agent for groundwater remediation because of (1) their high reactivity with chlorinated aliphatic hydrocarbons, organochlorine pesticides, organic dyes, and a number of inorganic contaminants, and (2) a possible greater persistance than the more extensively investigated nanoscale zerovalent iron. We have used laboratory-scale batch degradation experiments to investigate the effect that hydrogeochemical conditions have on the corrosion of milled ZVI and on its ability to degrade trichloroethene (TCE)...
October 27, 2017: Science of the Total Environment
Peng-Na Zhao, Yan-Ping Wang, Fei-Fei Gu, Chao-Zheng Li, Yu-Long Wei, Guang-Jun Wang, Wei-Bo Zhang
OBJECTIVE: To lay a foundation for meridian diagnosis by measuring the blood perfusion (BP) on yuan-source points of twelve meridians and calculating the normal range of imbalance degree (IBD) of left and right meridian (IBD-LRM), IBD of exterior-interior meridian (IBD-EIM) and IBD of hand-foot of the same name meridians (IBD-HFM) in healthy subjects. METHODS: BP at yuan-source points of twelve meridians was measured on 31 healthy volunteers by a Laser Doppler Line Scanner (LDLS)...
October 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
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