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Huw Davies, Liangbing Fu, Jeffrey Mighion, Eric Voight
An efficient and convenient synthesis of 2,2,2-trichloroethyl (TCE) aryl- and vinyldiazoacetates was achieved by palladium-catalyzed cross-coupling reactions between TCE diazoacetates and aryl or vinyl iodides. The broad substrate scope allows for rapid and facile formation of TCE aryl- and vinyl-diazoacetates, which recently have emerged as versatile reagents for rhodium-carbene chemistry.
January 17, 2017: Chemistry: a European Journal
Xinwei Mao, Ronald S Oremland, Tong Liu, Sara Gushgari, Abigail Amanda Landers, Shaun M Baesman, Lisa Alvarez-Cohen
Acetylene (C2H2) can be generated in contaminated groundwater sites as a consequence of chemical degradation of trichloroethene (TCE) by in situ minerals, and C2H2 is known to inhibit bacterial dechlorination. In this study, we show that while high C2H2 (1.3 mM) concentrations reversibly inhibit reductive dechlorination of TCE by Dehalococcoides mccartyi isolates as well as enrichment cultures containing D. mccartyi sp., low C2H2 (0.4 mM) concentrations do not inhibit growth or metabolism of D. mccartyi. Co-cultures of Pelobacter SFB93, a C2H2-fermenting bacterium, with D...
January 11, 2017: Environmental Science & Technology
Edward A Lock, Paul Keane, Philip H Rowe, John R Foster, Daniel Antoine, Christopher M Morris
1, 1, 2-Trichloroethylene (TCE) is of environmental concern, due to evaporation while handling, chemical processing and leakage from chemical waste sites, leading to its contamination of ground water and air. For several decades there has been issues about possible long term health effects of TCE but recently the International Agency for Research on Cancer (IARC) and the US Environmental Protection Agency classified TCE as a human carcinogen. Links having been established between occupational exposures and kidney cancer and possible links to non-Hodgkin lymphoma and liver cancer, but there is more still more to learn...
January 4, 2017: Toxicology
Miho Yoshikawa, Ming Zhang, Koki Toyota
Complete bioremediation of soils containing multiple volatile organic compounds (VOCs) remains a challenge. To explore the possibility of complete bioremediation through integrated anaerobic-aerobic biodegradation, laboratory feasibility tests followed by alternate anaerobic-aerobic and aerobic-anaerobic biodegradation tests were performed. Chlorinated ethylenes, including tetrachloroethylene (PCE), trichloroethylene (TCE), cis-dichloroethylene (cis-DCE), and vinyl chloride (VC), and dichloromethane (DCM) were used for anaerobic biodegradation, whereas benzene, toluene, and DCM were used for aerobic biodegradation tests...
2017: Water, Air, and Soil Pollution
D J Ryan, T M O'Connor, M M Murphy, A P Brady
AIM: To investigate the natural history of untreated small (<3 mm) and microscopic pulmonary arteriovenous malformations (PAVMs) in hereditary haemorrhagic telangiectasia (HHT) in order to discern the optimal frequency of follow-up thoracic computed tomography (CT). MATERIALS AND METHODS: A retrospective analysis was performed on the follow-up data for definite and suspected HHT patients with untreated PAVMs. RESULTS: For small PAVMs in definite HHT (n=13), PAVM enlargement was identified in one patient (1/13, 7...
December 29, 2016: Clinical Radiology
Lu Han, Linbo Qian, Jingchun Yan, Mengfang Chen
Adsorption behaviors of the chlorinated organic compounds (COCs) (i.e., trichloroethylene (TCE), 1,2,4-trichlorobenzene (1,2,4-TCB); 1,2-dichlorobenzene (1,2-DCB); and monochlorobenzene (MCB)) by the commercial rice husk-based biochar (RH500) and the laboratory-prepared biochars from corn stalks under different pyrolytic temperatures (i.e., CS300, CS500, CS700) were examined and interpreted by the pseudo-first-order kinetic model, the double layer model with two energies, and the Freundlich model. It is identified that the first-order adsorption rate constants (k 1 = 0...
December 28, 2016: Environmental Science and Pollution Research International
Jingyu Sun, Zhaolong Chen, Long Yuan, Yubin Chen, Jing Ning, Shuwei Liu, Donglin Ma, Xiuju Song, Manish K Priydarshi, Alicja Bachmatiuk, Mark H Rümmeli, Tianbao Ma, Linjie Zhi, Libai Huang, Yanfeng Zhang, Zhongfan Liu
In this work, we report the transfer-free measurement of carrier dynamics and transport of direct chemical vapor deposition (CVD) grown graphene on glass with the aid of ultrafast transient absorption microscopy (TAM) and demonstrate the use of such graphene glass for high-performance touch panel applications. The 4.5 in.-sized graphene glass was produced by an optimized CVD procedure, which can readily serve as transparent conducting electrode (TCE) without further treatment. The graphene glass exhibited an intriguing optical transmittance and electrical conductance concurrently, presenting a sheet resistance of 370-510 Ω·sq(-1) at a transmittance of 82%, much improved from our previous achievements...
December 27, 2016: ACS Nano
Yan Jiang, Jiahong Chen, Cong Yue, Hang Zhang, Jian Tong, Jianxiang Li, Tao Chen
Trichloroethylene (TCE), commonly used as an industrial solvent, is ubiquitous in our living environment. TCE exposure can induce hepatocellular carcinoma (HCC) in mice, but the underlying mechanisms remain elusive. To understand the role of miRNA in the hepatocarcinogenesis of TCE, we examined the miRNA expression profiles by microarray in the liver of B6C3F1 male mice exposed to TCE at 0 or 1000 mg/kg b.w.. Nine differentially expressed miRNAs were identified, out of which miR-182-5p exhibited the highest increase in expression...
December 24, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
Koshlan Mayer-Blackwell, Mohammad F Azizian, Jennifer K Green, Alfred M Spormann, Lewis Semprini
In anoxic groundwater aquifers, the long-term survival of Dehalococcoides mccartyi populations expressing the gene vcrA (or bvcA) encoding reductive vinyl chloride dehalogenases are important for complete dechlorination of tetrachloroethene (PCE) and trichloroethene (TCE) to non-chlorinated ethene. The absence or inactivity of vcrA-containing Dehalococcoides results in the accumulation of the harmful chlorinated intermediates dichloroethene (DCE) and vinyl chloride (VC). While vcrA-containing Dehalococcoides subpopulations depend on synergistic interaction with other organohalide-respiring populations generating their metabolic electron acceptors (DCE and VC), their survival requires successful competition for electron donor within the entire organohalide-respiring microbial community...
December 21, 2016: Environmental Science & Technology
Mojtaba G Mahmoodlu, Elizabeth M Pontedeiro, Jesús S Pérez Guerrero, Amir Raoof, S Majid Hassanizadeh, Martinus Th van Genuchten
In this study we performed batch experiments to investigate the dissolution kinetics of trichloroethylene (TCE) and toluene vapors in water at room temperature and atmospheric pressure. The batch systems consisted of a water reservoir and a connected headspace, the latter containing a small glass cylinder filled with pure volatile organic compound (VOC). Results showed that air phase concentrations of both TCE and toluene increased relatively quickly to their maximum values and then became constant. We considered subsequent dissolution into both stirred and unstirred water reservoirs...
January 2017: Journal of Contaminant Hydrology
Tae Ho Lee, Kyeong Heon Kim, Byeong Ryong Lee, Ju Hyun Park, E Fred Schubert, Tae Geun Kim
Nitride-based ultraviolet light-emitting diodes (UV LEDs) are promising replacements for conventional UV lamps. However, the external quantum efficiency of UV LEDs is much lower than for visible LEDs due to light absorption in the p-GaN contact and electrode layers, along with p-AlGaN growth and doping issues. To minimize such absorption, we should obtain direct ohmic contact to p-AlGaN using UV-transparent ohmic electrodes and not use p-GaN as a contact layer. Here, we propose a glass-based transparent conductive electrode (TCE) produced using electrical breakdown (EBD) of an AlN thin film, and we apply the thin film to four (Al)GaN-based visible and UV LEDs with thin buffer layers for current spreading and damage protection...
December 28, 2016: ACS Applied Materials & Interfaces
Kevin Tram, Gretta Stritesky, Kim Wadsworth, Jennifer Ng, Claudio Anasetti, Jason Dehn
HLA-DPB1 permissive matching based on T cell epitope (TCE) groups should be considered when selecting among equally matched HLA-A, -B, -C, -DRB1 unrelated hematopoietic stem cell donors to improve patient survival. Previous studies have defined 3 TCE groups based on functional assays of alloreactivity. Combinations of donor and recipient DPB1 alleles with low immunogenic potential identify permissive donors, who provide no increased risk of mortality compared with DPB1-matched donors. To determine the likelihood of identifying a DPB1 permissive-matched (includes both allele-matched and DPB1-permissive mismatched) unrelated donor for patients with high-resolution matches at 10/10 HLA-A, -B,- C, -DRB1, and -DQB1 in the Be The Match Registry, preliminary search requests from United States' transplant centers for 595 DPB1-typed patients were evaluated for existence of a DPB1 permissive-matched donor, identified either among already typed donors or by prospective DPB1 typing...
January 2017: Biology of Blood and Marrow Transplantation
Baixin Wang, Kung-Hui Chu
1,2,3-Trichloropropane (TCP) is an emerging groundwater pollutant and suspected human carcinogen. TCP, a recalcitrant contaminant, has been detected in the subsurface near TCP manufacture facilities and many superfund sites. Considering the toxicity and the occurence of TCP, there is a need to seek for cost-effective treatment technologies for TCP-contaminated sites. This paper investigated TCP biodegradation by propane-oxidizing bacteria (PrOB) which are known to express propane monooxygenase (PrMO). PrMO can cometabolically degrade many different contaminants...
February 2017: Chemosphere
Yanlai Han, Weile Yan
Zero-valent iron nanoparticles (nZVI) synthesized in the presence of reduced sulfur compounds have been shown to degrade trichloroethene (TCE) at significantly higher rates. However, the applicability of sulfidation as a general means to enhance nZVI reactivity under different particle preparation conditions and the underlying cause for this enhancement effect are not well understood. In this study, the effects of sulfidation reagent, time point of sulfidation, and sulfur loading on the resultant particles were assessed through TCE degradation experiments...
December 6, 2016: Environmental Science & Technology
Linda K Larkey, Denise J Roe, Lisa Smith, Denise Millstine
OBJECTIVE: Breast cancer survivors (BCSs) experience symptoms affecting overall quality of life (QOL), often for a prolonged period post-treatment. Meditative Movement (MM), including Qigong and Tai Chi Easy (QG/TCE), has demonstrated benefit for improving QOL issues such as fatigue and sleep, but there is limited evidence of its impact on cognitive function, overall physical activity, and body weight for BCSs. DESIGN: This double-blind, randomized controlled pilot study with 87 female BCSs explored effects of QG/TCE on mental and physical QOL (Medical Outcomes Survey, Short Form), cognitive function (Functional Assessment of Cancer Therapy-Cognitive Function and two cognitive performance tests from the WAIS III), overall levels of physical activity (PA)(Brief Physical Activity Questionnaire) and body mass index (BMI)...
December 2016: Complementary Therapies in Medicine
Agnese Lai, Federico Aulenta, Marina Mingazzini, Maria Teresa Palumbo, Marco Petrangeli Papini, Roberta Verdini, Mauro Majone
A sequential reductive-oxidative treatment was developed in this study in a continuous-flow bioelectrochemical reactor to address bioremediation of groundwater contaminated by trichloroethene (TCE) and less-chlorinated but still harmful intermediates, such as vinyl chloride. In order to optimize the anodic compartment, whereby the oxygen-driven microbial oxidation of TCE-daughter products occurs, abiotic batch experiments were performed with various anode materials poised at +1.20 V vs. SHE (i.e., graphite rods and titanium mesh anode coated with mixed metal oxides (MMO)) and setups (i...
February 2017: Chemosphere
Siyan Zhao, Chang Ding, Jianzhong He
Dehalococcoides mccartyi exhibits versatile capabilities to respire halogenated compounds under anaerobic conditions. In this study, we report the assembly and annotation of the complete genome of a chloroethene dechlorinating D. mccartyi strain 11a5. Bearing a 1,461,973 base-pair chromosome, strain 11a5 distinguishes itself from other D. mccartyi strains by possessing a 5,940 base-pair circular extrachromosomal genetic element which contains a reductive dehalogenase homolog. The whole genome of strain 11a5 harbors 31 putative reductive dehalogenase genes...
November 16, 2016: FEMS Microbiology Ecology
Wenxiong Shi
The super-saturated surfactant monolayer collapses with the nanoparticles (NPs) at the water/trichloroethylene (TCE) interface are investigated using molecular dynamics (MD) simulations. The results show that sodium alkyl sulfate (SDS) monolayer collapse is initiated by buckling and followed primarily by budding and the bud encapsulating the NPs and oil molecules. The developed bud detaches from the monolayer into a water phase and forms the swollen micelle emulsion with NPs and oil molecules. We investigate the wavelength of the initial budding and the theoretical description of the budding process...
November 17, 2016: Scientific Reports
Yanhua Liu, Su Shen, Jin Hu, Linsen Chen
An embedded Ag mesh transparent conductive electrode (TCE) on flexible substrate, which is suitable for polymer dispersed liquid crystal (PDLC) device, is demonstrated. With the combination of soft ultra-violet nanoimprinting lithography and scrape technique, it offers parallel processing with high resolution (10000dpi), as well as remarkable simplicity and fully controllable flexibility to tailor the transmittance and sheet resistance. While being able to achieve maximum transmittance 60% in the on state and the minimum 0...
October 31, 2016: Optics Express
Won-Yong Jin, Riski Titian Ginting, Keum-Jin Ko, Jae-Wook Kang
A novel approach for the fabrication of ultra-smooth and highly bendable substrates consisting of metal grid-conducting polymers that are fully embedded into transparent substrates (ME-TCEs) was successfully demonstrated. The fully printed ME-TCEs exhibited ultra-smooth surfaces (surface roughness ~1.0 nm), were highly transparent (~90% transmittance at a wavelength of 550 nm), highly conductive (sheet resistance ~4 Ω ◻(-1)), and relatively stable under ambient air (retaining ~96% initial resistance up to 30 days)...
November 3, 2016: Scientific Reports
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