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https://www.readbyqxmd.com/read/28431360/contrasting-dual-c-cl-isotope-fractionation-offers-potential-to-distinguish-reductive-chloroethene-transformation-from-breakdown-by-permanganate
#1
Eylem Doğan-Subaşı, Martin Elsner, Shiran Qiu, Stefan Cretnik, Siavash Atashgahi, Orfan Shouakar-Stash, Nico Boon, Winnie Dejonghe, Leen Bastiaens
cis-1,2-Dichloroethene (cis-DCE) and trichloroethene (TCE) are persistent, toxic and mobile pollutants in groundwater systems. They are both conducive to reductive dehalogenation and to oxidation by permanganate. In this study, the potential of dual element (C, Cl) compound specific isotope analyses (CSIA) for distinguishing between chemical oxidation and anaerobic reductive dechlorination of cis-DCE and TCE was investigated. Well-controlled cis-DCE degradation batch tests gave similar carbon isotope enrichment factors εC (‰), but starkly contrasting dual element isotope slopes Δδ(13)C/Δδ(37)Cl for permanganate oxidation (εC=-26‰±6‰, Δδ(13)C/Δδ(37)Cl≈-125±47) compared to reductive dechlorination (εC=-18‰±4‰, Δδ(13)C/Δδ(37)Cl≈4...
April 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28402964/set-mediates-tce-induced-liver-cell-apoptosis-through-dephosphorylation-and-upregulation-of-nucleolin
#2
Xiaohu Ren, Xinfeng Huang, Xifei Yang, Yungang Liu, Wei Liu, Haiyan Huang, Desheng Wu, Fei Zou, Jianjun Liu
Trichloroethylene (TCE) is an occupational and environmental chemical that can cause severe hepatotoxicity. While our previous studies showed that the phosphatase inhibitor SET is a key mediator of TCE-induced liver cell apoptosis, the molecular mechanisms remain elusive. Using quantitative phosphoproteomic analysis, we report here that nucleolin is a SET-regulated phosphoprotein in human liver HL-7702 cells. Functional analysis suggested that SET promoted dephosphorylation of nucleolin, decreased its binding to its transcriptional activator, c-myc, and upregulated nucleolin expression in TCE-treated cells...
April 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28395470/-an-investigation-of-trichloroethylene-induced-effects-on-histone-methylation-in-l-02-hepatic-cells
#3
R X Deng, X H Ren, J W Ruan, J Zheng, J C Zhong, W X Lu, X Q Zou, J J Liu
Objective: To further explore TCE-induced hepatotoxicity and its mechanisms by identification of trichloroethylene (TCE) induced abnormal histone methylation in human liver cells. Methods: L-02 cells were treated with 0 and 8 mmol/L TCE for 24 h. Histones were extracted by acid. Liquid chromatography electrospray ionization tandem mass spectrometry (ESI-LC-MS/MS) were used to identify and quantify TCE related histone methylations. TCE induced abnormal methylation of H3K79 me2 and H3K79 me3 were validated by Western blot analysis...
April 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28391943/treatability-of-volatile-chlorinated-hydrocarbon-contaminated-soils-of-different-textures-along-a-vertical-profile-by-mechanical-soil-aeration-a-laboratory-test
#4
Yan Ma, Yi Shi, Deyi Hou, Xi Zhang, Jiaqi Chen, Zhifen Wang, Zhu Xu, Fasheng Li, Xiaoming Du
Mechanical soil aeration is a simple, effective, and low-cost soil remediation technology that is suitable for sites contaminated with volatile chlorinated hydrocarbons (VCHs). Conventionally, this technique is used to treat the mixed soil of a site without considering the diversity and treatability of different soils within the site. A laboratory test was conducted to evaluate the effectiveness of mechanical soil aeration for remediating soils of different textures (silty, clayey, and sandy soils) along a vertical profile at an abandoned chloro-alkali chemical site in China...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28369613/collaborative-cross-mouse-population-enables-refinements-to-characterization-of-the-variability-in-toxicokinetics-of-trichloroethylene-and-provides-genetic-evidence-for-the-role-of-ppar-pathway-in-its-oxidative-metabolism
#5
Abhishek Venkatratnam, Shinji Furuya, Oksana Kosyk, Avram Gold, Wanda Bodnar, Kranti Konganti, David W Threadgill, Kevin M Gillespie, David L Aylor, Fred A Wright, Weihsueh A Chiu, Ivan Rusyn
Background: Trichloroethylene (TCE) is a known carcinogen in humans and rodents. Previous studies of inter-strain variability in TCE metabolism were conducted in multi-strain panels of classical inbred mice with limited genetic diversity to identify gene-environment interactions associated with chemical exposure. Objectives: To evaluate inter-strain variability in TCE metabolism and identify genetic determinants that are associated with TCE metabolism and effects using Collaborative Cross (CC), a large panel of genetically diverse strains of mice...
March 27, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28369519/exposure-cessation-during-adulthood-did-not-prevent-immunotoxicity-caused-by-developmental-exposure-to-low-level-trichloroethylene-in-drinking-water
#6
Kathleen M Gilbert, Shasha Bai, Dustyn Barnette, Sarah J Blossom
Exposure to the water pollutant trichloroethylene (TCE) can promote autoimmunity in both humans and rodents. Using a mouse model we have shown that chronic adult exposure to TCE at 500 μg/ml in drinking water generates autoimmune hepatitis in female MRL+/+ mice. There is increasing evidence that developmental exposure to certain chemicals can be more toxic than adult exposure. This study was designed to test whether exposure to a much lower level of TCE (0.05 μg/ml) during gestation, lactation and early life generated autoimmunity similar to that found following adult exposure to higher concentrations of TCE...
March 24, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28366041/a-single-dose-of-trichloroethylene-given-during-development-does-not-substantially-alter-markers-of-neuroinflammation-in-brains-of-adult-mice
#7
Jacqueline R Meadows, Chevonne Parker, Kathleen M Gilbert, Sarah J Blossom, Jamie C DeWitt
Trichloroethylene (TCE) is a widespread environmental contaminant associated with developmental immunotoxicity and neurotoxicity. Previous studies have shown that MRL(+/+) mice exposed to TCE from gestation through early-life demonstrate robust increases in inflammatory markers in peripheral CD4(+) T-cells, as well as glutathione depletion and increased oxidative stress in cerebellum-associated with alterations in behavior. Since increased oxidative stress is associated with neuroinflammation, we hypothesized that neuroinflammatory markers could be altered relative to unexposed mice...
December 2017: Journal of Immunotoxicology
https://www.readbyqxmd.com/read/28325748/halogenated-ether-alcohol-and-alkane-anesthetics-activate-task-3-tandem-pore-potassium-channels-likely-through-a-common-mechanism
#8
Anita Luethy, James D Boghosian, Rithu Srikantha, Joseph Cotten
TASK-3 (KCNK9) tandem pore potassium channel function is activated by halogenated anesthetics through binding at a putative anesthetic binding cavity. To understand pharmacological requirements for TASK-3 activation, we studied the concentration-response of TASK-3 to several anesthetics (isoflurane, desflurane, sevoflurane, halothane, α-chloralose, 2,2,2-trichloroethanol(TCE), and chloral hydrate), to ethanol, and to a panel of halogenated methanes and alcohols. We used mutagenesis to probe the anesthetic binding cavity as observed in a TASK-3 homology model...
March 21, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/28291229/optimizing-ultrathin-ag-films-for-high-performance-oxide-metal-oxide-flexible-transparent-electrodes-through-surface-energy-modulation-and-template-stripping-procedures
#9
Xi Yang, Pingqi Gao, Zhenhai Yang, Juye Zhu, Feng Huang, Jichun Ye
Among new flexible transparent conductive electrode (TCE) candidates, ultrathin Ag film (UTAF) is attractive for its extremely low resistance and relatively high transparency. However, the performances of UTAF based TCEs critically depend on the threshold thickness for growth of continuous Ag films and the film morphologies. Here, we demonstrate that these two parameters could be strongly altered through the modulation of substrate surface energy. By minimizing the surface energy difference between the Ag film and substrate, a 9 nm UTAF with a sheet resistance down to 6...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28264061/wheat-straw-biochar-supported-nanoscale-zerovalent-iron-for-removal-of-trichloroethylene-from-groundwater
#10
Hui Li, Ya Qin Chen, Shuai Chen, Xiao Li Wang, Shu Guo, Yue Feng Qiu, Yong Di Liu, Xiao Li Duan, Yun Jiang Yu
This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH4 and biochar pyrolyzed at 600°C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-order rate constant of TCE removal by BC-nZVI (1.079 h-1) within 260 min was 1.4 times higher and 539.5 times higher than that of biochar and nZVI, respectively. TCE was 79% dechlorinated by BC-nZVI within 15 h, but only 11% dechlorinated by unsupported nZVI, and no TCE dechlorination occurred with unmodified biochar...
2017: PloS One
https://www.readbyqxmd.com/read/28230207/enhanced-fenton-like-degradation-of-trichloroethylene-by-hydrogen-peroxide-activated-with-nanoscale-zero-valent-iron-loaded-on-biochar
#11
Jingchun Yan, Linbo Qian, Weiguo Gao, Yun Chen, Da Ouyang, Mengfang Chen
Composite of nanoscale Zero Valent Iron (nZVI) loaded on Biochar (BC) was prepared and characterized as hydrogen peroxide (H2O2) activator for the degradation of trichloroethylene (TCE). nZVI is homogeneously loaded on lamellarly structured BC surfaces to form nZVI/BC with specific surface area (SBET) of 184.91 m(2) g(-1), which can efficiently activate H2O2 to achieve TCE degradation efficiency of 98.9% with TOC removal of 78.2% within 30 min under the conditions of 0.10 mmol L(-1) TCE, 1.13 g L(-1) nZVI/BC and 1...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28228027/ab-initio-state-specific-n2-o-dissociation-and-exchange-modeling-for-molecular-simulations
#12
Han Luo, Marat Kulakhmetov, Alina Alexeenko
Quasi-classical trajectory (QCT) calculations are used in this work to calculate state-specific N2(X(1)Σ)+O((3)P)→2N((4)S)+O((3)P) dissociation and N2(X(1)Σ)+O((3)P)→NO(X(2)Π)+N((4)S) exchange cross sections and rates based on the 1(3)A″ and 1(3)A' ab initio potential energy surface by Gamallo et al. [J. Chem. Phys. 119, 2545-2556 (2003)]. The calculations consider translational energies up to 23 eV and temperatures between 1000 K and 20 000 K. Vibrational favoring is observed for dissociation reaction at the whole range of collision energies and for exchange reaction around the dissociation limit...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28226295/effect-of-the-dedicated-education-unit-on-nursing-student-self-efficacy-a-quasi-experimental-research-study
#13
Lynn E George, Lisa W Locasto, Katrina A Pyo, Thomas W Cline
Although the Dedicated Education Unit (DEU) has shown initial promise related to satisfaction with the teaching/learning environment, few studies have examined student outcomes related to the use of the DEU as a clinical education model beyond student satisfaction. The purpose of this quantitative, quasi-experimental study was to compare student outcomes from the traditional clinical education (TCE) model with those from the DEU model. Participants were students enrolled in a four-year baccalaureate program in nursing (n = 193) who had clinical education activities in one of three clinical agencies...
March 2017: Nurse Education in Practice
https://www.readbyqxmd.com/read/28224341/enhanced-transportability-of-zero-valent-iron-nanoparticles-in-aquifer-sediments-surface-modifications-reactivity-and-particle-traveling-distances
#14
Naresh Kumar, Jérôme Labille, Nathan Bossa, Mélanie Auffan, Pierre Doumenq, Jérôme Rose, Jean-Yves Bottero
In this study, we assessed the transportability of zero valent iron nanoparticles (nano-Fe(0)) coated with different organics (carboxy methyl cellulose (CMC), poly acrylic acid (PAA), and xanthan gum) in standard porous sand and in real aquifer sediments. Our results suggest that the organic surface coatings optimized for nano-Fe(0) in porous sand media do not necessarily reflect the same transportability in real field aquifer sediment. Xanthan gum-coated nano-Fe(0) showed highest transportability in standard porous sand, but the performance was much lower in real aquifer sediment, whereas the PAA-coated nano-Fe(0) particle showed better transportability both in aquifer sediment and in porous sand media...
February 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28214394/electrokinetic-enhanced-permanganate-delivery-and-remediation-of-contaminated-low-permeability-porous-media
#15
Ahmed I A Chowdhury, Jason I Gerhard, David Reynolds, Brent E Sleep, Denis M O'Carroll
Back diffusion of contaminants from low permeability strata has inhibited site remediation and closure due to an inability to deliver remediants into these strata. This study demonstrates the potential of electrokinetics (EK) to significantly reduce back diffusion of chlorinated compounds from low permeability porous media. Experiments were conducted in a two-dimensional sandbox packed with vertical layers of coarse sand and silt contaminated with aqueous trichloroethene (TCE). Three experiments, each approximately 41 days in duration, compared EK-enhanced in situ chemical oxidation (EK-ISCO) to EK or ISCO alone...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28213734/dehalococcoides-and-general-bacterial-ecology-of-differentially-trichloroethene-dechlorinating-flow-through-columns
#16
Babur S Mirza, Darwin L Sorensen, Daniel J McGlinn, R Ryan Dupont, Joan E McLean
The diversity of Dehalococcoides mccartyi (Dhc) and/or other organohalide respiring or associated microorganisms in parallel, partial, or complete trichloroethene (TCE) dehalogenating systems has not been well described. The composition of Dhc populations and the associated bacterial community that developed over 7.5 years in the top layer (0-10 cm) of eight TCE-fed columns were examined using pyrosequencing. Columns biostimulated with one of three carbon sources, along with non-stimulated controls, developed into complete (ethene production, whey amended), partial (cis-dichloroethene (DCE) and VC, an emulsified oil with nonionic surfactant), limited (<5 % cis-DCE and 95 % TCE, an emulsified oil), and non- (controls) TCE dehalogenating systems...
February 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28202180/chemical-structure-influence-on-napl-mixture-nonideality-evolution-rate-limited-dissolution-and-contaminant-mass-flux
#17
Mark C Padgett, Geoffrey R Tick, Kenneth C Carroll, William R Burke
The influence of chemical structure on NAPL mixture nonideality evolution, rate-limited dissolution, and contaminant mass flux was examined. The variability of measured and UNIFAC modeled NAPL activity coefficients as a function of mole fraction was compared for two NAPL mixtures containing structurally-different contaminants of concern including toluene (TOL) or trichloroethene (TCE) within a hexadecane (HEXDEC) matrix. The results showed that dissolution from the NAPL mixtures transitioned from ideality for mole fractions >0...
February 3, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28199864/oxidation-of-trichloroethylene-by-the-hydroxyl-radicals-produced-from-oxygenation-of-reduced-nontronite
#18
Xixiang Liu, Songhu Yuan, Man Tong, Deng Liu
Reduction by Fe(II)-bearing silicate minerals has been proposed as an important mechanism for the attenuation of chlorinated hydrocarbons (CHCs) in anoxic subsurfaces. The redox condition of subsurface often changes from anoxic to oxic due to natural processes and human activities, but little is known about the transformation of CHCs induced by Fe(II)-bearing silicate minerals under oxic conditions. This study reveals that trichloroethylene (TCE) can be efficiently oxidized during the oxygenation of reduced nontronite at pH 7...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28188205/metagenomic-and-metatranscriptomic-analyses-reveal-the-structure-and-dynamics-of-a-dechlorinating-community-containing-dehalococcoides-mccartyi-and-corrinoid-providing-microorganisms-under-cobalamin-limited-conditions
#19
Yujie Men, Ke Yu, Jacob Bælum, Ying Gao, Julien Tremblay, Emmanuel Prestat, Ben Stenuit, Susannah G Tringe, Janet Jansson, Tong Zhang, Lisa Alvarez-Cohen
The aim of this study is to obtain a systems-level understanding of the interactions between Dehalococcoides and corrinoid-supplying microorganisms by analyzing community structures and functional compositions, activities, and dynamics in trichloroethene (TCE)-dechlorinating enrichments. Metagenomes and metatranscriptomes of the dechlorinating enrichments with and without exogenous cobalamin were compared. Seven putative draft genomes were binned from the metagenomes. At an early stage (2 days), more transcripts of genes in the Veillonellaceae bin-genome were detected in the metatranscriptome of the enrichment without exogenous cobalamin than in the one with the addition of cobalamin...
April 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28182522/the-effects-of-tarantula-cubensis-venom-on-open-wound-healing-in-rats
#20
N Y Gul Satar, I T Cangul, A Topal, H Kurt, V Ipek, G I Onel
OBJECTIVE: The aim of this study was to evaluate the clinical and histopathological effects of two different dosages of alcohol extract of Tarantula cubensis (Theranekron) on open wounds. METHOD: A total of 24 Sprague-Dawley rats were randomly divided into Tarantula cubensis extract (TCE1, n=8) 1/10 diluted, TCE (TCE2, n=8), and (3) vehicle-control (0.2 ml of 96 % ethanol, n=8) groups. Experimental full-thickness 1 x 1cm wounds were created on dorsum skin. TCE or vehicle were given systemically by subcutaneous injections on postoperative days 1 and 4...
February 2, 2017: Journal of Wound Care
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