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https://www.readbyqxmd.com/read/28099813/photoactive-donor-acceptor-composite-nanoparticles-dispersed-in-water
#1
Laurie Parrenin, Gildas Laurans, Eleni Pavlopoulou, Guillaume Fleury, Gilles Pecastaings, Cyril Brochon, Laurence Vignau, Georges Hadziioannou, Eric Cloutet
A major issue that inhibits large-scale fabrication of organic solar modules is the use of chlorinated solvents considered as toxic and hazardous. In this work, composite particles of poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2',1',3'-benzothiadiazole] (PCDTBT) and [6,6]-Phenyl C71 butyric acid methyl ester (PC71BM) were obtained in water from a versatile and a ready-to-market methodology based on miniemulsion post-polymerization. Depending on experimental conditions, size-controlled particles comprising both the electron-donor and the electron-acceptor were obtained and characterized using transmission electron microscopy (TEM), atomic force microscopic (AFM), small-angle neutron scattering (SANS), UV-visible absorption and fluorescence spectroscopies...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098448/new-insights-into-trihalomethane-and-haloacetic-acid-formation-potentials-correlation-with-the-molecular-composition-of-natural-organic-matter-in-source-water
#2
Xin Wang, Haifeng Zhang, Yahe Zhang, Quan Shi, Juan Wang, Jianwei Yu, Min Yang
Natural organic matter (NOM) represents the major source of precursors for disinfection byproducts (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs), formed during disinfection of drinking water, but the molecular composition and reactivity of NOM remain not well understood. In this study, electrospray ionization coupled to Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to characterize the molecular composition of NOM of twenty source waters taken across China for the purpose of determining the major precursors of THMs and HAAs at molecular level...
January 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28095695/frontier-molecular-orbital-contributions-to-chlorination-versus-hydroxylation-selectivity-in-the-non-heme-iron-halogenase-syrb2
#3
Martin Srnec, Edward I Solomon
The ability of an Fe(IV)=O intermediate in SyrB2 to perform chlorination vs. hydroxylation was computationally evaluated for different substrates that had been studied experimentally. The π-trajectory for H-atom abstraction (Fe(IV)=O oriented perpendicular to the C-H bond of substrate) was found to lead to the S = 2 five-coordinate HO-Fe(III)-Cl complex with the C• of the substrate, π-oriented relative to both the Cl(-) and OH(-) ligands. From this ferric intermediate, hydroxylation is thermodynamically favored, but chlorination is intrinsically more reactive due to the energy splitting between two key redox-active dπ* frontier molecular orbitals (FMOs)...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28094923/effect-of-e-waste-recycling-on-urinary-metabolites-of-organophosphate-flame-retardants-and-plasticizers-and-their-association-with-oxidative-stress
#4
Shaoyou Lu, Yanxi Li, Tao Zhang, Dan Cai, Jujun Ruan, Mingzhi Huang, Lei Wang, JianQing Zhang, Rong-Liang Qiu
In this study, three chlorinated (Cl-mOPs) and five nonchlorinated (NCl-mOPs) organophosphate metabolites were determined in urine samples collected from participants living in electronic waste (e-waste) dismantling area (n = 175) and two reference areas (rural: n = 29; urban: n = 17) in southern China. Bis(2-chloroethyl) phosphate [BCEP, geometric mean (GM): 0.72 ng/mL] was the most abundant Cl-mOP, and diphenyl phosphate (DPHP, 0.55 ng/mL) was the most abundant NCl-mOP. The GM concentrations of mOPs in the e-waste dismantling sites were higher than those in the rural control site...
January 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28093121/phenyltrichlorosilane-functionalized-magnesium-oxide-microspheres-preparation-characterization-and-application-for-the-selective-extraction-of-dioxin-like-polycyclic-aromatic-hydrocarbons-in-soils-with-matrix-solid-phase-dispersion
#5
Dongqin Tan, Jing Jin, Fang Li, Xiaoli Sun, Dhanjai, Yuwen Ni, Jiping Chen
Magnesium oxide microspheres functionalized with phenyltrichlorosilane (PTS-MgO) were synthesized by surface modification through silanization reaction, which was confirmed by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetry analysis (TGA) and N2 adsorption-desorption. The result indicated that PTS-MgO not only possessed the ability of enhancing the retention with PAHs, but also weakening the interference from chlorinated compounds. As a sorbent for the matrix solid-phase dispersion (MSPD) extraction, PTS-MgO was used to selectively extract seven dioxin-like polycyclic aromatic hydrocarbons (DL-PAHs) from soil samples...
March 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28092936/the-effect-of-ozonation-and-biological-activated-carbon-treatment-of-wastewater-effluents-on-formation-of-n-nitrosamines-and-halogenated-disinfection-byproducts
#6
Yi-Hsueh Chuang, William A Mitch
Ozonation followed by biological activated carbon (O3/BAC) is being considered as a key component of reverse osmosis-free advanced treatment trains for potable wastewater reuse. Using a laboratory-scale O3/BAC system treating two nitrified wastewater effluents, this study characterized the effect of different ozone dosages (0-1.0 mg O3/mg dissolved organic carbon) and BAC empty bed contact times (EBCT; 15-60 minutes) on the formation after chlorination or chloramination of 35 regulated and unregulated halogenated disinfection byproducts (DBPs), 8 N-nitrosamines, and bromate...
January 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28092761/chlorinated-and-ultraviolet-radiation-treated-reclaimed-irrigation-water-is-the-source-of-aeromonas-found-in-vegetables-used-for-human-consumption
#7
Fadua Latif-Eugenín, Roxana Beaz-Hidalgo, Carolina Silvera-Simón, Xavi Fernandez-Cassi, María J Figueras
Wastewater is increasingly being recognized as a key water resource, and reclaimed water (or treated wastewater) is used for irrigating vegetables destined for human consumption. The aim of the present study was to determine the diversity and prevalence of Aeromonas spp. both in reclaimed water used for irrigation and in the three types of vegetables irrigated with that water. Seven of the 11 (63.6%) samples of reclaimed water and all samples of vegetables were positive for the presence of Aeromonas. A total of 216 Aeromonas isolates were genotyped and corresponded to 132 different strains that after identification by sequencing the rpoD gene belonged to 10 different species...
January 13, 2017: Environmental Research
https://www.readbyqxmd.com/read/28091540/retraction-heavy-metal-removal-from-mss-fly-ash-by-thermal-and-chlorination-treatments
#8
Jingyong Liu, Jiacong Chen, Limao Huang
No abstract text is available yet for this article.
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088529/effect-of-water-chemistry-on-disinfection-by-product-formation-in-the-complex-surface-water-system
#9
Rongjie Hao, Yan Zhang, Tingting Du, Li Yang, Adeyemi S Adeleye, Yao Li
The relationship between the disinfection by-products (DBPs) formed with chlorination and chloramination techniques and the water chemistry of Haihe River was compared. Samples were collected at 28 different points within the mainstream and tributaries of the river. The DBPs investigated include trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), haloketones (HKs), and trichloronitromethane. THMs formed when the samples were chlorinated mostly exceeded 100 and 600 μg/L in the mainstream and tributaries and in the estuary, respectively...
December 8, 2016: Chemosphere
https://www.readbyqxmd.com/read/28088023/a-novel-model-to-predict-gas-phase-hydroxyl-radical-oxidation-kinetics-of-polychlorinated-compounds
#10
Shuang Luo, Zongsu Wei, Richard Spinney, Zhihui Yang, Liyuan Chai, Ruiyang Xiao
In this study, a novel model based on aromatic meta-substituent grouping was presented to predict the second-order rate constants (k) for OH oxidation of PCBs in gas-phase. Since the oxidation kinetics are dependent on the chlorination degree and position, we hypothesized that it may be more accurate for k value prediction if we group PCB congeners based on substitution positions (i.e., ortho (o), meta (m), and para (p)). To test this hypothesis, we examined the correlation of polarizability (α), a quantum chemical based descriptor for k values, with an empirical Hammett constant (σ(+)) on each substitution position...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28087526/rapid-enrichment-of-dehalococcoides-like-bacteria-by-partial-hydrophobic-separation
#11
Hanna R Temme, Kipp Sande, Tao Yan, Paige J Novak
: Organohalide respiring bacteria can be difficult to enrich and isolate, which can limit research on these important organisms. The goal of this research was to develop a method to rapidly (minutes to days) enrich these organisms from a mixed community. The method presented is based on the hypothesis that organohalide respiring bacteria would be more hydrophobic than other bacteria as they dehalogenate hydrophobic compounds. The developed method tests this hypothesis by separating a portion of putative organohalide respiring bacteria, those phylogenetically related to Dehalococcoides mccartyi, at the interface between a hydrophobic organic solvent and aqueous media...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28087479/synthesis-and-characterization-of-gold-nanostructured-chorin-e6-for-photodynamic-therapy
#12
L Vieira, M L Castilho, I Ferreira, J Ferreira-Strixino, K C Hewitt, L Raniero
Photodynamic therapy is an alternative treatment for cancer based on cellular uptake of a photosensitizer, illuminated with an appropriate wavelength in the presence of oxygen. A cascade of reactions generates reactive oxygen species leading to cell death. Using carbodiimide chemistry, chlorin e6 (Ce6) was covalently bonded to thiourea, and (via the sulphur end group) to gold nanoparticles (AuNPs), forming the Ce6-AuNP complex. Ce6 absorbs in the range 650-680nm, where the coefficient of biological tissue absorption is low (part of the therapeutic window), which is ideal for biological application...
January 10, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28075568/reaction-pathways-and-kinetics-of-a-cyanobacterial-neurotoxin-%C3%AE-n-methylamino-l-alanine-bmaa-during-chlorination
#13
Yiting Chen, Wan-Ru Chen, Zhiquan Liu, Tsair-Fuh Lin
β-N-Methylamino-L-alanine (BMAA), a probable cause of the amyotrophic lateral sclerosis/parkinsonism-dementia complex (ALS/PDC), or Alzheimer's disease, has been identified in more than 20 cyanobacterial genera. However, its removal and fate in drinking water has never been reported before. In this study, the reaction of BMAA with chlorine, a common drinking-water oxidant/disinfectant, was investigated. A liquid chromatograph coupled with a triple quadrupole mass spectrometer was employed to quantify BMAA and its intermediates...
January 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28074362/the-determination-and-fate-of-disinfection-by-products-from-ozonation-chlorination-of-fulvic-acid
#14
Xin Zhong, Chongwei Cui, Shuili Yu
Ozonation of fulvic acid (FA) can result in diverse intermediate oxidation by-products, significantly affecting disinfection by-product (DBP) formation following chlorination. The objective of this study was to provide insight into ozone reaction intermediates and reveal the possible formation pathway of DBPs from ozonation of FA due to the formation of intermediate oxidation by-products. Aldehydes, aromatic acids, short-chain acids, chloroform, and dichloroacetic acid were detected at various ozone dosage additions...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28074342/the-presence-of-modified-nucleosides-in-extracellular-fluids-leads-to-the-specific-incorporation-of-5-chlorocytidine-into-rna-and-modulates-the-transcription-and-translation
#15
Caroline Noyon, Thierry Roumeguère, Cédric Delporte, Damien Dufour, Melissa Cortese, Jean-Marc Desmet, Christophe Lelubre, Alexandre Rousseau, Philippe Poelvoorde, Jean Nève, Luc Vanhamme, Karim Zouaoui Boudjeltia, Pierre Van Antwerpen
Myeloperoxidase (MPO) is able to promote several kinds of damage and is involved in mechanisms leading to various diseases such as atherosclerosis or cancers. An example of these damages is the chlorination of nucleic acids, which is considered as a specific marker of the MPO activity. Since 5-chlorocytidine has been recently shown in healthy donor plasmas, this study aimed at discovering if these circulating modified nucleosides could be incorporated into RNA and DNA and if their presence impacts the ability of enzymes involved in the incorporation, transcription, and translation processes...
January 10, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28073485/spatial-distribution-and-sources-of-organic-matter-and-pollutants-in-the-se-mediterranean-levantine-basin-deep-water-sediments
#16
P Astrahan, J Silverman, Y Gertner, B Herut
A study of deep sea sediment quality was conducted at 52 stations off the Mediterranean coast of Israel (50-1900m depth). Total Organic Carbon (TOC), Polycyclic Aromatic Hydrocarbons (∑PAHs), Poly Chlorinated Biphenyls (∑PCBs) ranged between 0.58 and 1.44%, 12-190 and <0.3-7.7μgkg(-1), respectively. The TOC distribution indicated the Nile delta as an important source of organic matter and the important effect of topography on deposition patterns in this region. PCBs and PAHs quantitative levels were associated with nearby gas well drilling and dredge-material dumping sites...
January 8, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28070573/nanoparticle-delivery-of-wnt-1-sirna-enhances-photodynamic-therapy-by-inhibiting-epithelial-mesenchymal-transition-for-oral-cancer
#17
Chuan Ma, Leilei Shi, Yu Huang, Lingyue Shen, Hao Peng, Xinyuan Zhu, Guoyu Zhou
Activation of the epithelial to mesenchymal transition (EMT) in photodynamic therapy (PDT) can lead to the recurrence and progression of tumors. To enhance the effects of PDT, it is essential to inhibit the Wnt/β-catenin signaling pathway involved in EMT progression. Herein, we used polyethylene glycol-polyethyleneimine-chlorin e6 (PEG-PEI-Ce6) nanoparticles to efficiently deliver Wnt-1 small interfering RNA (siRNA) to the cytoplasm of KB cells (oral squamous cell carcinoma) that were subjected to PDT. Wnt-1 siRNA effectively inhibited the Wnt/β-catenin signaling pathway, reducing the expression of Wnt-1, β-catenin and vimentin that are crucial to the EMT...
January 10, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28070104/comparative-photodynamic-therapy-cytotoxicity-of-mannose-conjugated-chlorin-and-talaporfin-sodium-in-cultured-human-and-rat-cells
#18
Yo Shinoda, Tsutomu Takahashi, Jiro Akimoto, Megumi Ichikawa, Hiromi Yamazaki, Atsushi Narumi, Shigenobu Yano, Yasuyuki Fujiwara
Photodynamic therapy (PDT) is a Food and Drug Administration authorized method for cancer treatment, which uses photosensitizer and laser photo-irradiation to generate reactive oxygen species to induce cell death in tumors. Photosensitizers have been progressively developed, from first to third generation, with improvements in cell specificity, reduced side effects and toxicity, increased sensitivity for irradiation and reduced persistence of photosensitizer in healthy cells. These improvements have been achieved by basic comparative experiments between current and novel photosensitizers using cell lines; however, photosensitizers should be carefully evaluated because they may have cell type specificity...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28070075/electrocatalytic-reduction-of-free-chlorine-at-an-n-n-diethylaniline-grafted-carbon-electrode-for-improved-sensitivity-in-amperometric-detection
#19
Kotaro Morita, Naoki Hirayama
The electrocatalytic activity of an N,N-diethylaniline-grafted carbon (DEA/PFC) electrode was utilized to improve the sensitivity in the cathodic detection of free chlorine. Voltammetric curves showed a well-defined cathodic peak of free chlorine on DEA/PFC, lowering the overlap with that of dissolved oxygen. Amperometric measurements were applied for the determination of free chlorine for a concentration range of 4 orders of magnitude. The results showed that measurements of the amperometric response with DEA/PFC can be used as the basis for a simple, accurate, and rapid method to determine free chlorine...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28069619/occupational-exposure-to-solvents-and-risk-of-head-and-neck-cancer-in-women-a-population-based-case-control-study-in-france
#20
Matthieu Carton, Christine Barul, Gwenn Menvielle, Diane Cyr, Marie Sanchez, Corinne Pilorget, Brigitte Trétarre, Isabelle Stücker, Danièle Luce
OBJECTIVE: Our objective was to investigate the association between head and neck cancer and occupational exposure to chlorinated, oxygenated and petroleum solvents in women. METHODS: Investigation of occupational and environmental CAuses of REspiratory cancers (ICARE), a French population-based case-control study, included 296 squamous cell carcinomas of the head and neck (HNSCC) in women and 775 female controls. Lifelong occupational history was collected. Job-exposure matrices allowed to assess exposure to 5 chlorinated solvents (carbon tetrachloride; chloroform; methylene chloride; perchloroethylene; trichloroethylene), 5 petroleum solvents (benzene; special petroleum product; gasoline; white spirits and other light aromatic mixtures; diesel, fuels and kerosene) and 5 oxygenated solvents (alcohols; ketones and esters; ethylene glycol; diethyl ether; tetrahydrofuran)...
January 9, 2017: BMJ Open
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