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https://www.readbyqxmd.com/read/28527388/abiotic-transformation-of-hexabromocyclododecane-by-sulfidated-nanoscale-zerovalent-iron-kinetics-mechanism-and-influencing-factors
#1
Dan Li, Xifen Zhu, Yin Zhong, Weilin Huang, Ping'an Peng
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(-1)) was almost completely transformed by S-nZVI (0...
May 9, 2017: Water Research
https://www.readbyqxmd.com/read/28525874/less-studied-tce-are-their-environmental-concentrations-increasing-due-to-their-use-in-new-technologies
#2
M Filella, J C Rodríguez-Murillo
The possible environmental impact of the recent increase in use of a group of technology-critical elements (Nb, Ta, Ga, In, Ge and Te) is analysed by reviewing published concentration profiles in environmental archives (ice cores, ombrotrophic peat bogs, freshwater sediments and moss surveys) and evaluating temporal trends in surface waters. No increase has so far been recorded. The low potential direct emissions of these elements, resulting from their absolute low production levels, make it unlikely that the increasing use of these elements in modern technology has any noticeable effect on their environmental concentrations on a global scale...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28511297/-the-effect-of-complement-c3a-receptor-antagonist-in-the-kidney-immune-injury-in-trichloroethylene-sensitized-mice
#3
P Yang, D D Zang, X D Yang, B D Li, X Wang, J X Zhang, Q X Zhu
Objective: To explore the effect of complement C3 a-C3a receptor in the kidney immune inju-ry in trichloroethylene-sensitized mice by using C3a receptor specific antagonist C3aRA and discuss the patho-genesis of kidney injury in occupational dermatitis medicamentosa-like of trichloroethylene (ODMLT) . Methods: 42 female 6~8 weeks old BALB/c mice of specific pathogen free were randomly divided into blank control group (5) , solvent control group (5) , TCE treatment group (16) and TCE+C3aRA treatment group (16) ...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28500890/effect-of-static-magnetic-field-on-trichloroethylene-removal-in-a-biotrickling-filter
#4
Yue Quan, Hao Wu, Zhenhao Yin, Yingyu Fang, Chengri Yin
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(3) 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...
May 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28494362/transformation-of-carbon-tetrachloride-and-chloroform-by-trichloroethene-respiring-anaerobic-mixed-cultures-and-supernatant
#5
Kyle E Vickstrom, Mohammad F Azizian, Lewis Semprini
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...
April 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28479186/dissolution-enhancement-and-mathematical-modeling-of-removal-of-residual-trichloroethene-in-sands-by-ozonation-during-flushing-with-micro-nano-bubble-solution
#6
Menghau Sung, Chun-Hao Teng, Tsung-Hsien Yang
Soil flushing using micro-nano-sized bubbles (MNB) in water as the flushing solution was tested in laboratory sand columns for the cleanup of residual trichloroethene (TCE) non-aqueous-phase-liquid (NAPL). Experiments considering flushing with MNB as well as ozone MNB (OZMNB) in water to treat soils contaminated with residual TCE liquid were conducted to examine effects of ozone on dissolution enhancement. The degrees of residual TCE saturation in soils, ranging from 0.44% to 7.6%, were tested. During flushings, aqueous TCE concentrations at the column exit were monitored and TCE masses remained in the columns after flushing were determined...
April 6, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28463483/a-field-trial-of-tce-phytoremediation-by-genetically-modified-poplars-expressing-cytochrome-p450-2e1
#7
Emily K Legault, C Andrew James, Keith Stewart, Indulis Muiznieks, Sharon L Doty, Stuart E Strand
A controlled field study was performed to evaluate the effectiveness of transgenic poplars for phytoremediation in a field setting. Three hydraulically contained test beds were planted with twelve transgenic poplars, twelve wild type (WT) poplars, or left unplanted, and dosed with equivalent amounts of trichloroethylene (TCE). Degradation 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...
May 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28431360/contrasting-dual-c-cl-isotope-fractionation-offers-potential-to-distinguish-reductive-chloroethene-transformation-from-breakdown-by-permanganate
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
Anita Luethy, James D Boghosian, Rithu Srikantha, Joseph F Cotten
The TWIK-related acid-sensitive potassium channel 3 (TASK-3; KCNK9) tandem pore potassium channel function is activated by halogenated anesthetics through binding at a putative anesthetic-binding cavity. To understand the pharmacologic 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...
June 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
#16
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
#17
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
#18
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
#19
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
#20
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
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