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https://www.readbyqxmd.com/read/28285111/modeling-aerobic-biotransformation-of-vinyl-chloride-by-vinyl-chloride-assimilating-bacteria-methanotrophs-and-ethenotrophs
#1
Yiwen Liu, Huu Hao Ngo, Wenshan Guo, Jing Sun, Dongbo Wang, Lai Peng, Bing-Jie Ni
Recent studies have investigated the potential of enhanced groundwater Vinyl Chloride (VC) remediation in the presence of methane and ethene through the interactions of VC-assimilating bacteria, methanotrophs and ethenotrophs. In this study, a mathematical model was developed to describe aerobic biotransformation of VC in the presence of methane and ethene for the first time. It examines the metabolism of VC by VC-assimilating bacteria as well as cometabolism of VC by both methanotrophs and ethenotrophs, using methane and ethene respectively, under aerobic conditions...
March 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28276244/recent-developments-in-the-synthesis-of-biomacromolecules-and-their-conjugates-by-set-lrp
#2
Gerard Lligadas, Silvia Grama, Virgil Percec
Single Electron Transfer-Living Radical Polymerization (SET-LRP) represents a robust and versatile tool for the synthesis of vinyl polymers with well-defined topology and chain end functionality. The crucial step in SET-LRP is the disproportionation of the Cu(I)X generated by activation with Cu(0) wire, powder, or nascent Cu(0) generated in situ into nascent, extremely reactive Cu(0) atoms and nanoparticles, and Cu(II)X2. Nascent Cu(0) activates the initiator and dormant chains via a homogeneous or heterogeneous outer-sphere single-electron transfer (SET-LRP) mechanism...
March 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28273579/novel-modified-poly-vinyl-chloride-blend-membranes-for-removal-of-heavy-metals-from-mixed-ion-feed-sample
#3
Vignesh Nayak, M S Jyothi, R Geetha Balakrishna, Mahesh Padaki, Sebastien Deon
Herein, an attempt has been made to prepare a novel membrane with good efficiency for removal of heavy metal ions namely lead (Pb), cadmium (Cd) and chromium (Cr). 4-amino benzoic acid (ABA) was covalently grafted onto the poly vinyl chloride (PVC) backbone by CN bond to enhance the hydrophilicity. (1)H NMR and ATR-IR spectroscopy analysis confirmed the chemical modification of PVC. Further the modified polymer was blended in different compositions with polysulfone (PSf) for optimization. Morphological changes that occurred in blend membranes, due to the incorporation of modified PVC was studied by AFM and SEM techniques...
February 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273571/detoxification-of-1-1-2-trichloroethane-to-ethene-in-a-bioreactor-co-culture-of-dehalogenimonas-and-dehalococcoides-mccartyi-strains
#4
Siti Hatijah Mortan, Lucía Martín-González, Teresa Vicent, Gloria Caminal, Ivonne Nijenhuis, Lorenz Adrian, Ernest Marco-Urrea
1,1,2-Trichloroethane (1,1,2-TCA) is a non-flammable organic solvent and common environmental contaminant in groundwater. Organohalide-respiring bacteria are key microorganisms to remediate 1,1,2-TCA because they can gain metabolic energy during its dechlorination under anaerobic conditions. However, all current isolates produce hazardous end products such as vinyl chloride, monochloroethane or 1,2-dichloroethane that accumulate in the medium. Here, we constructed a syntrophic co-culture of Dehalogenimonas and Dehalococcoides mccartyi strains to achieve complete detoxification of 1,1,2-TCA to ethene...
February 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28266849/palladium-ii-catalyzed-directed-anti-hydrochlorination-of-unactivated-alkynes-with-hcl
#5
Joseph Derosa, Annabelle L Cantu, Mark N Boulous, Miriam L O'Duill, Joshua L Turnbull, Zhen Liu, Daizy M De La Torre, Keary M Engle
A regioselective anti-hydrochlorination of unactivated alkynes is reported. The reaction utilizes in situ generated HCl as the source of both the Cl(-) and H(+) and is catalyzed by palladium(II) acetate, with loadings as low as 25 ppm. Removable picolinamide and 8-aminoquinoline bidentate directing groups are used to control the regioselectivity of the chloropalladation step and stabilize the resulting vinylpalladium(II) intermediate for subsequent protodepalladation. This method provides access to a broad array of substituted vinyl chlorides in excellent yields and with high regioselectivity...
March 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28263175/the-purified-vepoloxamer-prevents-haemolysis-in-42-day-stored-dehp-pvc-free-red-blood-cell-units
#6
Jose A Cancelas, Neeta Rugg, Shawnagay Nestheide, Sarah E Hill, R Martin Emanuele, Douglas S Mckenzie
BACKGROUND: Use of the plasticiser di(2-ethylhexyl) phthalate (DEHP) in polyvinyl chloride (PVC) blood bags poses a potential dilemma. The presence of DEHP in blood bags has been shown to be beneficial to red blood cells during storage by diminishing haemolysis. However, DEHP use in PVC may be carcinogenic or estrogenising. Vepoloxamer is a poloxamer with rheological and cytoprotective rheological properties and a favourable toxicity profile in clinical trials. We hypothesised that vepoloxamer may be sufficient to replace the plasticiser DEHP to prevent elevated haemolysis while conserving the biochemical and redox potential++ in RBCs stored for up to 42 days...
March 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/28260558/medical-response-to-a-vinyl-chloride-release-from-a-train-derailment-new-jersey-2012
#7
Alice M Shumate, Jamille Taylor, Elizabeth McFarland, Christina Tan, Mary Anne Duncan
OBJECTIVE: The objective of this investigation was to examine the health impact of and medical response to a mass casualty chemical incident caused by a vinyl chloride release. METHODS: Key staff at area hospitals were interviewed about communication during the response, the number of patients treated and care required, and lessons learned. Clinical information related to the incident and medical history were abstracted from hospital charts. RESULTS: Hospital interviews identified a desire for more thorough and timely incident-specific information and an under-utilization of regionally available resources...
March 6, 2017: Disaster Medicine and Public Health Preparedness
https://www.readbyqxmd.com/read/28241685/-investigation-on-a-case-of-acute-vinyl-chloride-poisoning
#8
X G Wang
No abstract text is available yet for this article.
December 20, 2016: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28208993/preliminary-sem-observations-on-the-surface-of-elastomeric-impression-materials-after-immersion-or-ozone-disinfection
#9
Nikolas Poulis, Anthony Prombonas, Stavros Yannikakis, Thanasis Karampotsos, Martha-Spyridoula Katsarou, Nikolaos Drakoulis
INTRODUCTION: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations. AIM: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials. MATERIALS AND METHODS: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28192935/pre-polarized-hydrophobic-conducting-polymer-solid-contact-ion-selective-electrodes-with-improved-potential-reproducibility
#10
Ning He, Soma Papp, Tom Lindfors, Lajos Höfler, Rose-Marie Latonen, Róbert E Gyurcsányi
Electrically conducting polymers (ECPs) are one of the most popular types of materials to interface ion-selective membranes (ISMs) with electron-conducting substrates to construct solid-contact ion-selective electrodes (SCISEs). For optimal ion-to-electron transduction and potential stability, the p-doped ECPs with low oxidation potentials such as PPy need to be generally in their conducting form along with providing a sufficiently hydrophobic interface to counteract the aqueous layer formation. The first criterion requires that the ECPs are in their oxidized state, but the high charge density of this state is detrimental for the prevention of the aqueous layer formation...
February 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28178216/highly-sensitive-sensors-based-on-metal-oxide-nanocolumns-for-fire-detection
#11
Kwangjae Lee, Young-Seok Shim, Young Geun Song, Soo Deok Han, Youn-Sung Lee, Chong-Yun Kang
A fire detector is the most important component in a fire alarm system. Herein, we present the feasibility of a highly sensitive and rapid response gas sensor based on metal oxides as a high performance fire detector. The glancing angle deposition (GLAD) technique is used to make the highly porous structure such as nanocolumns (NCs) of various metal oxides for enhancing the gas-sensing performance. To measure the fire detection, the interface circuitry for our sensors (NiO, SnO₂, WO₃ and In₂O₃ NCs) is designed...
February 7, 2017: Sensors
https://www.readbyqxmd.com/read/28164705/metal-organic-framework-chitosan-hybrid-materials-promote-nitric-oxide-release-from-s-nitrosoglutathione-in-aqueous-solution
#12
Megan J Neufeld, Alec Lutzke, Jesus B Tapia, Melissa M Reynolds
It has been previously demonstrated that copper-based metal-organic frameworks (MOFs) accelerate formation of the therapeutically active molecule nitric oxide (NO) from S-nitrosothiols (RSNOs). Because RSNOs are naturally present in blood, this function is hypothesized to permit the controlled production of NO through use of MOF-based blood-contacting materials. The practical implementation of MOFs in this application typically requires incorporation within a polymer support, yet this immobilization has been shown to impair the ability of the MOF to interact with the NO-forming RSNO substrate...
February 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28164193/long-time-and-distance-self-propelling-of-a-pvc-sphere-on-a-water-surface-with-an-embedded-zno-micro-nano-structured-hollow-sphere
#13
Lei Wang, Lujia Yu, Liting Yi, Bin Yuan, Yongping Hou, Xiangfu Meng, Jing Liu
In this research, a zinc oxide micro-/nano-structured hollow sphere (MNHS) with a large specific surface area is applied as energy storage material to encapsulate poly(vinyl chloride) solution and control the fuel release. The sustained release effect of MNHS not only makes the motion more controllable, but enhances the motion time and distance.
February 6, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28160361/nonmigrating-equivalent-substitutes-for-pvc-dop-formulations-as-shown-by-a-tg-study-of-pvc-with-covalently-bound-peo-ppo-oligomers
#14
Rodrigo Navarro, Tülin Gacal, Melike Ocakoglu, Carolina García, Carlos Elvira, Alberto Gallardo, Helmut Reinecke
Monoamino functionalized ethylenoxide (EO)/propylenoxide oligomers (Jeffamine) are linked chemically to poly(vinyl chloride) (PVC) using trichlorotriazine chemistry in order to prepare nonmigrating internally plasticized materials. The dependence of the plasticizer efficiency on both the number of anchoring points to the chains and the PVC/plasticizer compatibility is investigated using oligomers of different molecular weight and hydrophilic-hydrophobic balance. Hydrophilic oligomers (containing predominantly EO) of molecular weights between 2000 and 5000 g mol(-1) exhibit excellent plasticizer efficiency, nearly identical to di-2-ethylhexylphthalate (DOP) in conventional PVC/DOP mixtures and may therefore be used as nonmigrating equivalents for DOP...
February 3, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28126048/dehalogenimonas-formicexedens-sp-nov-a-chlorinated-alkane-respiring-bacterium-isolated-from-contaminated-groundwater
#15
Trent A Key, Kimberly S Bowman, Imchang Lee, Jongsik Chun, Milton da Costa, Luciana Albuquerque, Fred A Rainey, William M Moe
A strictly anaerobic, Gram-stain-negative, non-spore-forming bacterium designated NSZ-14T, isolated from contaminated groundwater in Louisiana (USA), was characterized using a polyphasic approach. Strain NSZ-14T reductively dehalogenated a variety of polychlorinated aliphatic alkanes, producing ethene from 1,2-dichloroethane, propene from 1,2-dichloropropane, a mixture of cis- and trans-1,2-dichloroethene from 1,1,2,2-tetrachloroethane, vinyl chloride from 1,1,2-trichloroethane, and allyl chloride (3-chloro-1-propene) from 1,2,3-trichloropropane...
January 23, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28124265/sources-and-fate-of-microplastics-in-marine-and-beach-sediments-of-the-southern-baltic-sea-a-preliminary-study
#16
Bożena Graca, Karolina Szewc, Danuta Zakrzewska, Anna Dołęga, Magdalena Szczerbowska-Boruchowska
Microplastics' (particles size ≤5 mm) sources and fate in marine bottom and beach sediments of the brackish are strongly polluted Baltic Sea have been investigated. Microplastics were extracted using sodium chloride (1.2 g cm(-3)). Their qualitative identification was conducted using micro-Fourier-transform infrared spectroscopy (μFT-IR). Concentration of microplastics varied from 25 particles kg(-1) d.w. at the open sea beach to 53 particles kg(-1) d.w. at beaches of strongly urbanized bay. In bottom sediments, microplastics concentration was visibly lower compared to beach sediments (0-27 particles kg(-1) d...
January 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28107950/label-free-potentiometric-biosensor-based-on-solid-contact-for-determination-of-total-phenols-in-honey-and-propolis
#17
Patrícia Ferrante Draghi, Julio Cesar Bastos Fernandes
We developed a label-free potentiometric biosensor using tyrosinase extracted from Musa acuminata and immobilized by covalent bond on a surface of a solid-contact transducer. The transducer was manufactured containing two layers. The first layer contained a blend of poly(vinyl) chloride carboxylated (PVC-COOH), graphite and potassium permanganate. On this layer, we deposited a second layer containing just a mixture of poly(vinyl chloride) carboxylated and graphite. On the last layer of the transducer, we immobilized the tyrosinase enzyme by reaction with N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28088371/a-quality-by-design-qbd-study-on-enoxaparin-sodium-loaded-polymeric-microspheres-for-colon-specific-delivery
#18
Dana Hales, Laurian Vlase, Sebastian Alin Porav, Andreea Bodoki, Lucian Barbu-Tudoran, Marcela Achim, Ioan Tomuță
The aim of this study was to apply quality by design (QbD) for pharmaceutical development of enoxaparin sodium microspheres for colon-specific delivery. The Process Parameters (CPPs) and Critical Quality Attributes (CQAs) were identified. A central composite experimental design was used in order to develop the design space of microspheres for colon-specific delivery that have the desired Quality Target Product Profile (QTPP). The CPPs studied were Eudragit® FS-30D/Eudragit® RS-PO ratio, poly(vinyl alcohol) (PVA) concentration and sodium chloride (NaCl) concentration...
March 30, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28088360/hollow-porous-ionic-liquids-composite-polymers-based-solid-phase-extraction-coupled-online-with-high-performance-liquid-chromatography-for-selective-analysis-of-hydrophilic-hydroxybenzoic-acids-from-complex-samples
#19
Xingping Dai, Dongsheng Wang, Hui Li, Yanyi Chen, Zhicheng Gong, Haiyan Xiang, Shuyun Shi, Xiaoqing Chen
Polar and hydrophilic properties of hydroxybenzoic acids usually made them coelute with interferences in high performance liquid chromatography (HPLC) analysis. Then selective analysis of them was necessary. Herein, hollow porous ionic liquids composite polymers (PILs) based solid phase extraction (SPE) was firstly fabricated and coupled online with HPLC for selective analysis of hydroxybenzoic acids from complex matrices. Hollow porous PILs were firstly synthesized using Mobil Composition of Matter No. 48 (MCM-48) spheres as sacrificial support, 1-vinyl-3-methylimidazolium chloride (VMIM(+)Cl(-)) as monomer, and ethylene glycol dimethacrylate (EGDMA) as cross-linker...
February 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28066982/visible-light-promoted-nickel-and-organic-dye-cocatalyzed-formylation-reaction-of-aryl-halides-and-triflates-and-vinyl-bromides-with-diethoxyacetic-acid-as-a-formyl-equivalent
#20
He Huang, Xiangmin Li, Chenguang Yu, Yueteng Zhang, Patrick S Mariano, Wei Wang
A simple formylation reaction of aryl halides, aryl triflates, and vinyl bromides under synergistic nickel- and organic-dye-mediated photoredox catalysis is reported. Distinct from widely used palladium-catalyzed formylation processes, this reaction proceeds by a two-step mechanistic sequence involving initial in situ generation of the diethoxymethyl radical from diethoxyacetic acid by a 4CzIPN-mediated photoredox reaction. The formyl-radical equivalent then undergoes nickel-catalyzed substitution reactions with aryl halides and triflates and vinyl bromides to form the corresponding aldehyde products...
January 9, 2017: Angewandte Chemie
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