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https://www.readbyqxmd.com/read/28918966/reactive-oxygen-species-and-associated-reactivity-of-peroxymonosulfate-activated-by-soluble-iron-species
#1
Richard J Watts, Miao Yu, Amy L Teel
The activation of peroxymonosulfate by iron (II), iron (III), and iron (III)-EDTA for in situ chemical oxidation (ISCO) was compared using nitrobenzene as a hydroxyl radical probe, anisole as a hydroxyl radical+sulfate radical probe, and hexachloroethane as a reductant+nucleophile probe. In addition, activated peroxymonosulfate was investigated for the treatment of the model groundwater contaminants perchloroethylene (PCE) and trichloroethylene (TCE). The relative activities of hydroxyl radical and sulfate radical in the degradation of the probe compounds and PCE and TCE were isolated using the radical scavengers tert-butanol and isopropanol...
September 8, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28903082/hesperidin-a-citrus-bioflavonoid-alleviates-trichloroethylene-induced-oxidative-stress-in-drosophila-melanogaster
#2
Amos Olalekan Abolaji, Oluwatoyin Victoria Babalola, Abimbola Kehinde Adegoke, Ebenezer Olatunde Farombi
Trichloroethylene (TCE) is a chlorinated organic pollutant of groundwater with diverse toxic effects in animals and humans. Here, we investigated the ameliorative role of hesperidin, a citrus bioflavonoid on TCE-induced toxicity in Drosophila melanogaster. Four groups of D. melanogaster (50 flies/vial, with 5 vials/group) were exposed to ethanol (2.5%, control), HSP (400mg/10g diet), TCE (10μM/10g diet) and TCE (10μM/10g diet)+HSP (400mg/10g diet) respectively in the diet for 5days. Then, selected oxidative stress and antioxidant markers were evaluated...
September 1, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28894752/identification-of-multiple-dehalogenase-genes-involved-in-tetrachloroethene-to-ethene-dechlorination-in-a-dehalococcoides-dominated-enrichment-culture
#3
Mohamed Ismaeil, Naoko Yoshida, Arata Katayama
Chloroethenes (CEs) are widespread groundwater toxicants that are reductively dechlorinated to nontoxic ethene (ETH) by members of Dehalococcoides. This study established a Dehalococcoides-dominated enrichment culture (designated "YN3") that dechlorinates tetrachloroethene (PCE) to ETH with high dechlorination activity, that is, complete dechlorination of 800 μM PCE to ETH within 14 days in the presence of Dehalococcoides species at 5.7 ± 1.9 × 10(7) copies of 16S rRNA gene/mL. The metagenome of YN3 harbored 18 rdhA genes (designated YN3rdhA1-18) encoding the catalytic subunit of reductive dehalogenase (RdhA), four of which were suggested to be involved in PCE-to-ETH dechlorination based on significant increases in their transcription in response to CE addition...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28893230/assessment-of-free-radical-scavenging-and-anti-proliferative-activities-of-tinospora-cordifolia-miers-willd
#4
Picheswara Rao Polu, Udupa Nayanbhirama, Saleemulla Khan, Rajlexmi Maheswari
BACKGROUND: Tinospora cordifolia (Guduchi or Amrita) is an important drug of Ayurvedic System of Medicine and found mention in various classical texts for the treatment of diseases such as jaundice, fever, diabetes, cancer and skin disease etc. In view of its traditional claims, antioxidant and anti-proliferative activities were evaluated in the present study. METHODS: Ethanol extract (TCE) and subsequent petroleum ether (TCP), dichloromethane (TCD), n-Butanol (TCB) and aqueous (TCA) fractions of were prepared from stems of T cordifolia...
September 11, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28889360/enhanced-effect-of-hah-on-citric-acid-chelated-fe-ii-catalyzed-percarbonate-for-trichloroethene-degradation
#5
Xiaori Fu, Mark L Brusseau, Xueke Zang, Shuguang Lu, Xiang Zhang, Usman Farooq, Zhaofu Qiu, Qian Sui
This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichloroethene (TCE) by the citric acid (CA)-chelated Fe(II)-catalyzed percarbonate (SPC) system. The results of a series of batch-reactor experiments show that TCE removal with HAH addition was increased from approximately 57 to 79% for a CA concentration of 0.1 mM and from 89 to 99.6% for a 0.5 mM concentration. Free-radical probe tests elucidated the existence of hydroxyl radical (HO(•)) and superoxide anion radical (O2(•-)) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems...
September 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28887054/hla-dpb1-matching-in-unrelated-hematopoietic-stem-cell-transplantation-program-contributes-to-a-higher-incidence-of-disease-relapse
#6
Marija Burek Kamenaric, Marija Maskalan, Zorana Grubic, Mirta Mikulić, Ranka Serventi Seiwerth, Nadira Duraković, Radovan Vrhovac, Katarina Stingl Jankovic, Renata Zunec
The impact of patient/donor matching for HLA-A, -B, -C, -DRB1 and -DQB1 genes in hematopoietic stem cell transplantation (HSCT) is well-recognized, but typing for additional genes, such as HLA-DPB1, is still controversial. Based on defined T-cell epitope (TCE) groups, all HLA-DPB1 mismatches can be classified as permissive or non-permissive. In this retrospective study we analysed 82 patient/matched unrelated donor (MUD) pairs who underwent HSCT, and explored the impact of HLA-DPB1 matches, permissive and non-permissive mismatches on transplantation outcomes...
September 5, 2017: Human Immunology
https://www.readbyqxmd.com/read/28884561/tanycytic-ependymoma-of-the-brain-stem-presentations-of-rare-cystic-disease-variants-and-review-of-literature
#7
Ekkehard M Kasper, Franziska M Ippen, Georgios A Maragkos, Matthew P Anderson, Rafael Rojas, Anand Mahadevan
BACKGROUND: Tanycytic ependymoma is a rare variant of ependymoma and management guidelines for patients with this disease are not established. METHODS: We performed a systematic search on Pubmed complimented by hand- searching citation lists to identify patients with pathologically confirmed tanycytic ependymoma. Signs and symptoms, radiological and specific pathological findings as well as reported treatment modalities and outcomes were recorded and analyzed. RESULTS: 51 studies involving a total of 77 patients were identified and included in this review...
September 7, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28884077/environmentally-toxicant-exposures-induced-intragenerational-transmission-of-liver-abnormalities-in-mice
#8
Mohamed A Al-Griw, Soad A Treesh, Rabia O Alghazeer, Sassia O Regeai
Environmental toxicants such as chemicals, heavy metals, and pesticides have been shown to promote transgenerational inheritance of abnormal phenotypes and/or diseases to multiple subsequent generations following parental and/or ancestral exposures. This study was designed to examine the potential transgenerational action of the environmental toxicant trichloroethane (TCE) on transmission of liver abnormality, and to elucidate the molecular etiology of hepatocyte cell damage. A total of thirty two healthy immature female albino mice were randomly divided into three equal groups as follows: a sham group, which did not receive any treatment; a vehicle group, which received corn oil alone, and TCE treated group (3 weeks, 100 μg/kg i...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/28873502/bioremediation-in-fractured-rock-1-modeling-to-inform-design-monitoring-and-expectations
#9
Claire R Tiedeman, Allen M Shapiro, Paul A Hsieh, Thomas E Imbrigiotta, Daniel J Goode, Pierre J Lacombe, Mary F DeFlaun, Scott R Drew, Carole D Johnson, John H Williams, Gary P Curtis
Field characterization of a trichloroethene (TCE) source area in fractured mudstones produced a detailed understanding of the geology, contaminant distribution in fractures and the rock matrix, and hydraulic and transport properties. Groundwater flow and chemical transport modeling that synthesized the field characterization information proved critical for designing bioremediation of the source area. The planned bioremediation involved injecting emulsified vegetable oil and bacteria to enhance the naturally occurring biodegradation of TCE...
September 5, 2017: Ground Water
https://www.readbyqxmd.com/read/28869789/subtle-changes-in-the-active-site-architecture-untangled-overlapping-substrate-ranges-and-mechanistic-differences-of-two-reductive-dehalogenases
#10
Cindy Kunze, Gabriele Diekert, Torsten Schubert
Reductive dehalogenases (RDases) of organohalide-respiring bacteria are cobamide-containing iron-sulfur proteins that catalyze different reductive dehalogenation reactions. Here, we report a functional analysis of two recombinant RDases, the tetrachloroethene (PCE) reductive dehalogenase (PceA) of Desulfitobacterium hafniense Y51 and the 1,2-dichloroethane (DCA) reductive dehalogenase (DcaA) of Desulfitobacterium dichloroeliminans DCA1. Both enzymes share 88% protein sequence identity, but appeared to have divergent mechanisms...
September 4, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28867961/potential-immunotoxic-effects-of-trichloroethylene-induced-iv-allergic-reaction-in-renal-impairment
#11
Jun-Feng Yu, Yan-Yan Feng, Xiao-Feng Shen
Trichloroethylene (TCE) is known to induce allergic contact dermatitis and subsequent occupational medicamentosa-like dermatitis (OMLD) with multi-system injuries, including liver, kidney, and skin injuries. However, the mechanisms underlying immune system dysfunction that result in organ injury have not yet been clearly elucidated. In the present study, we measured the levels of secreted cytokines by effect or T cells in TCE-treated guinea pigs to better understand the contribution of allergic disorders in renal injuries...
2017: Central-European Journal of Immunology
https://www.readbyqxmd.com/read/28863369/application-of-ozone-micro-nano-bubbles-to-groundwater-remediation
#12
Liming Hu, Zhiran Xia
Ozone is widely used for water treatment because of its strong oxidation ability. However, the efficiency of ozone in groundwater remediation is limited because of its relatively low solubility and rapid decomposition in the aqueous phase. Methods for increasing the stability of ozone within the subsurface are drawing increasing attention. Micro-nano-bubbles (MNBs), with diameters ranging from tens of nanometres to tens of micrometres, present rapid mass transfer rates, persist for a relatively long time in water, and transport with groundwater flow, which significantly improve gas concentration and provide a continuous gas supply...
August 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28847102/the-effect-of-nanoparticles-and-humic-acid-on-technology-critical-element-concentrations-in-aqueous-solutions-with-soil-and-sand
#13
Zane Stepka, Ishai Dror, Brian Berkowitz
As a consequence of their growing use in electronic and industrial products, increasing amounts of technology critical elements (TCEs) are being released to the environment. Currently little is known about the fate of many of these elements. Initial research on their potential environmental impact identifies TCEs as emerging contaminants. TCE movement in the environment is often governed by water systems. Research on "natural" waters so far demonstrates that TCEs tend to be associated with suspended particulate matter (SPM), which influences TCE aqueous concentrations (here: concentration of TCEs in dissolved form and attached to SPM) and transport...
August 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28830695/unintentional-contaminant-transfer-from-groundwater-to-the-vadose-zone-during-source-zone-remediation-of-volatile-organic-compounds
#14
Andrea D Chong, K Ulrich Mayer
Historical heavy use of chlorinated solvents in conjunction with improper disposal practices and accidental releases has resulted in widespread contamination of soils and groundwater in North America and worldwide. As a result, remediation of chlorinated solvents is required at many sites. For source zone treatment, common remediation strategies include in-situ chemical oxidation (ISCO) using potassium or sodium permanganate, and the enhancement of biodegradation by primary substrate addition. It is well known that these remediation methods tend to generate gas (carbon dioxide (CO2) in the case of ISCO using permanganate, CO2 and methane (CH4) in the case of bioremediation)...
September 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28830064/cometabolic-degradation-of-dichloroethenes-by-comamonas-testosteroni-rf2
#15
Michal Zalesak, Jan Ruzicka, Robert Vicha, Marie Dvorackova
An environmental isolate Comamonas testosteroni strain RF2, which has been found to cometabolize trichloroethene (TCE) in the presence of phenol and sodium lactate as growth substrates, was tested to investigate its capacity for degrading 1,2-cis-dichloroethene (cDCE), 1,2-trans-dichlorothene (tDCE), and 1,1-dichloroethene (1,1DCE). Degradation assays were performed for single DCEs, as well as for a mixture of DCEs with TCE, which resembled contaminated plume in groundwater. RF2 was capable of efficiently removing all three dichloroethenes (DCEs) at the initial aqueous concentrations of 6...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28828896/toxicological-effects-of-trichloroethylene-exposure-on-immune-disorders
#16
Josue D Ordaz, Nur P Damayanti, Joseph M K Irudayaraj
Trichloroethylene (TCE) is one of the most common ground water contaminants in USA. Even though recent regulation mandates restricted utilization of TCE, its use is not completely prohibited, especially in industrial and manufacturing processes. The risk of TCE on human health is an ongoing field of study and its implications on certain diseases such as cancer has been recognized and well-documented. However, the link between TCE and immune disorders is still an under-studied area. Studies on the risk of TCE on the immune system is usually focused on certain immune class disorders, but consensus on the impact of TCE on the immune system has not been established...
August 22, 2017: Immunopharmacology and Immunotoxicology
https://www.readbyqxmd.com/read/28820043/rapid-removal-of-chloroform-carbon-tetrachloride-and-trichloroethylene-in-water-by-aluminum-iron-alloy-particles
#17
Jie Xu, Yuan Pu, Xiao Jin Yang, Pingyu Wan, Rong Wang, Peng Song, Adrian Fisher
Water contamination with chlorinated hydrocarbons such as chloroform (CHCl3), carbon tetrachloride (CCl4) and trichloroethylene (TCE) is one of the major public health concerns. In this study, we explored the use of aluminum-iron alloys particles in millimeter scale for rapid removal of CHCl3, CCl4 and TCE from water. Three types of Al-Fe alloy particles containing 10, 20 and 58 wt% of Fe (termed as Al-Fe10, Al-Fe20 and Al-Fe58) were prepared and characterized by electrochemical polarization, X-ray diffraction and energy dispersive spectrometer...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28809851/grape-pomace-compost-harbors-organohalide-respiring-dehalogenimonas-species-with-novel-reductive-dehalogenase-genes
#18
Yi Yang, Steven A Higgins, Jun Yan, Burcu Şimşir, Karuna Chourey, Ramsunder Iyer, Robert L Hettich, Brett Baldwin, Dora M Ogles, Frank E Löffler
Organohalide-respiring bacteria have key roles in the natural chlorine cycle; however, most of the current knowledge is based on cultures from contaminated environments. We demonstrate that grape pomace compost without prior exposure to chlorinated solvents harbors a Dehalogenimonas (Dhgm) species capable of using chlorinated ethenes, including the human carcinogen and common groundwater pollutant vinyl chloride (VC) as electron acceptors. Grape pomace microcosms and derived solid-free enrichment cultures were able to dechlorinate trichloroethene (TCE) to less chlorinated daughter products including ethene...
August 15, 2017: ISME Journal
https://www.readbyqxmd.com/read/28797995/tinospora-cordifolia-induces-cell-cycle-arrest-in-human-oral-squamous-cell-carcinoma-cells
#19
Parveen Bansal, Manzoor Ahmad Malik, Satya N Das, Jasbir Kaur
Natural products with medicinal value are gradually gaining importance in clinical research due to their well-known property of no side effects as compared to drugs. Tinospora cordifolia (Guduchi) has been used for centuries in Ayurvedic system of medicine for treating various ailments including cancer. In present study, we found that the Tinospora cordifolia extracts (TCE) induced inhibition of proliferation of KB cells was associated with arrest of G0/G1-phase of cell cycle. The effectiveness of TCE in checking the growth of KB cells without altering the growth of normal peripheral blood mononuclear cells (PBMC) indicates that Tinospora cordifolia has differential effect on normal and malignant cells hence, it may have therapeutic potential in cancer...
May 2017: Gulf Journal of Oncology
https://www.readbyqxmd.com/read/28791967/highly-stable-and-flexible-graphene-cf3so2-2nh-graphene-transparent-conductive-electrodes-for-organic-solar-cells
#20
Sang Woo Seo, Ha Seung Lee, Dong Hee Shin, Ju Hwan Kim, Chan Wook Jang, Jong Min Kim, Sung Kim, Suk-Ho Choi
We first employ highly-stable and -flexible (CF3SO2)2NH-doped graphene (TFSA/GR) and GR-encapsulated TFSA/GR (GR/TFSA/GR) transparent conductive electrodes (TCEs) prepared on polyethylene terephthalate substrates for flexible organic solar cells (OSCs). Compared to conventional indium tin oxide (ITO) TCEs, the TFSA-doped-GR TCEs show higher optical transmittance and larger sheet resistance. The TFSA/GR and GR/TFSA/GR TCEs show work functions of 4.89 ± 0.16 and 4.97 ± 0.18 eV, respectively, which are not only larger than those of the ITO TCEs but also indicate p-type doping of GR, and are therefore more suitable for anode TCEs of OSCs...
August 9, 2017: Nanotechnology
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