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https://www.readbyqxmd.com/read/29903205/-tumor-markers-of-workers-exposed-to-vinyl-chloride
#1
Xiaoxing Zhang, Guiyun Zhang, Jingwei Xiao, Zhimin Chang, Yujie Yan, Ling Xue, Nan Liu, Bin Li, Weijun Guan
OBJECTIVE: To detect the changes of serum tumor markers of vinyl chloride, and find the influencing factors of tumor markers. METHODS: Two hundred and twenty-three workers exposed to vinyl chloride from a chlor alkali plant and one hundred and forty-nine workers without occupational exposure to vinyl chloride were recruited into this study. Detected 11 tumor markers in serum of the objective. RESULTS: The contentsof carcino-embryonic antigen( CEA), alpha-fetoprotein( AFP), CA-199 and CA72-4 in exposed group increased with the length of service, while the content of neuron-specific enolase( NSE) decreased with the length of service, but there was no correlation between contents of tumor markers and the length of service, which had no statistical significance( P > 0...
November 2017: Wei Sheng Yan Jiu, Journal of Hygiene Research
https://www.readbyqxmd.com/read/29897649/pd-catalyzed-vinylation-of-aryl-halides-with-inexpensive-organosilicon-reagents-under-mild-conditions
#2
Chu-Ting Yang, Jun Han, Jun Liu, Yi Li, Fan Zhang, Hai-Zhu Yu, Sheng Hu, Xiaolin Wang
Pd-catalyzed Hiyama vinylation reaction of non-activated aryl chlorides and bromides under mild conditions was developed. The use of efficient vinyl donors and electron-rich sterically hindered phosphine ligands was critical for the success of the reaction. The products of this transformation can be used for Am/Cm separation, an important challenge in nuclear fuel reprocessing. The substituent effect on Am/Cm separating property was also achieved, which contributes to the development of new chromatographic materials for the separation of Am and Cm...
June 13, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29895798/a-general-aqueous-silanization-protocol-to-introduce-vinyl-mercapto-or-azido-functionalities-onto-cellulose-fibers-and-nanocelluloses
#3
Marco Beaumont, Markus Bacher, Martina Opietnik, Wolfgang Gindl-Altmutter, Antje Potthast, Thomas Rosenau
The effective and straight-forward modification of nanostructured celluloses under aqueous conditions or as “never-dried” materials is challenging. We report a silanization protocol in water using catalytic amounts of hydrogen chloride and then sodium hydroxide in a two-step protocol. The acidic step hydrolyzes the alkoxysilane to obtain water-soluble silanols and the subsequent addition of catalytic amounts of NaOH induces a covalent reaction between cellulose surficial hydroxyl groups and the respective silanols...
June 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29883562/gold-nanoparticle-modified-poly-vinyl-chloride-surface-with-improved-antimicrobial-properties-for-medical-devices
#4
Angelika Kwiatkowska, Ludomira H Granicka, Anna Grzeczkowicz, Radosław Stachowiak, Paweł Bącal, Kamil Sobczak, Marek Darowski, Maciej Kozarski, Jacek Bielecki
Despite the significant technological progress achieved in the past decades in the medical field, device-related infections carry a heavy social and economic burden. Surface modification of medical equipment is one of the most interesting approaches employed to improve the antibacterial activity of a material. Herein, we developed a process for the gold nanoparticle modification of a poly(vinyl chloride) laryngeal tube, which typically serves as an airway management device. In our study, we focused specifically on increasing the antimicrobial properties of the material while maintaining its biocompatibility...
May 1, 2018: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29869491/one-pot-domino-friedel-crafts-acylation-annulation-between-alkynes-and-2-methoxybenzoyl-chlorides-synthesis-of-2-3-disubstituted-chromen-4-one-derivatives
#5
Radha Bam, Wesley A Chalifoux
A highly regioselective synthesis of 2,3-disubstituted chromen-4-one derivatives is accomplished from readily available internal alkynes and 2-methoxybenzoyl chlorides. The reaction proceeds via a domino intermolecular Friedel-Crafts acylation/intramolecular vinyl carbocation trapping (or oxa-Michael addition)/demethylation reaction sequence. This Lewis acid promoted method features relatively mild reaction conditions to synthesize a variety of 2,3-disubstituted chromen-4-one derivatives in one-pot with up to 93% yield...
June 5, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29867784/chlorinated-electron-acceptor-abundance-drives-selection-of-dehalococcoides-mccartyi-d-mccartyi-strains-in-dechlorinating-enrichment-cultures-and-groundwater-environments
#6
Alfredo Pérez-de-Mora, Anna Lacourt, Michaye L McMaster, Xiaoming Liang, Sandra M Dworatzek, Elizabeth A Edwards
Dehalococcoides mccartyi ( D. mccartyi ) strains differ primarily from one another by the number and identity of the reductive dehalogenase homologous catalytic subunit A ( rdhA ) genes within their respective genomes. While multiple rdhA genes have been sequenced, the activity of the corresponding proteins has been identified in only a few cases. Examples include the enzymes whose substrates are groundwater contaminants such as trichloroethene (TCE), cis -dichloroethene (cDCE) and vinyl chloride (VC). The associated rdhA genes, namely tceA, bvcA , and vcrA , along with the D...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29860842/unlocking-structural-diversity-in-gold-iii-hydrides-unexpected-interplay-of-cis-trans-influence-on-stability-insertion-chemistry-and-nmr-chemical-shifts
#7
Luca Rocchigiani, Julio Fernandez-Cestau, Isabelle Chambrier, Peter Hrobárik, Manfred Bochmann
The synthesis of new families of stable or at least spectroscopically observable gold(III) hydride complexes is reported, including anionic cis-hydrido chloride, hydrido aryl and cis-dihydride complexes. Reactions between (C^C)AuCl(PR3) and LiHBEt3 afford the first examples of gold(III) phosphino hydrides (C^C)AuH(PR3) (R = Me, Ph, p-tolyl; C^C = 4,4'-di-tert-butylbiphenyl-2,2'-diyl). The X-ray structure of (C^C)AuH(PMe3) was determined. LiHBEt3 reacts with (C^C)AuCl(py) to give [(C^C)Au(H)Cl] , whereas (C^C)AuH(PR3) undergoes phosphine displacement, generating the dihydride [(C^C)AuH2] ...
June 4, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29783661/analysis-of-short-term-smoking-effects-in-pbmc-of-healthy-subjects-preliminary-study
#8
Joanna Wieczfinska, Tomasz Kowalczyk, Przemyslaw Sitarek, Ewa Skała, Rafal Pawliczak
Early structural changes exist in the small airways before the establishment of Chronic Obstructive Pulmonary Disease (COPD). These changes are believed to be induced by oxidation. The aim of this study was to analyze the influence of short-term smoking on the expression of the genes contributing to airway remodeling and their relationship with the oxidative status of human blood cells. Blood mononuclear cells were isolated from 16 healthy volunteers and treated with cigarette smoke ingredients (CSI): nicotine, 1-Nitrosodimethylamine, N-Nitrosopyrrolidyne, vinyl chloride, acetone, and acrolein...
May 18, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29768398/urinary-metabolites-of-volatile-organic-compounds-of-infants-in-the-neonatal-intensive-care-unit
#9
Dina El-Metwally, Krista Chain, Matthew P Stefanak, Udeni Alwis, Benjamin C Blount, Judy S LaKind, Cynthia F Bearer
BackgroundPreterm infants (PTI) in the NICU are often placed in incubators that may increase their exposure to volatile organic chemicals (VOCs). To determine whether PTI in incubators have higher urinary concentrations of VOC metabolites compared with infants in cribs.MethodsUrine from 40 PTI in incubators and 40 infants in cribs was collected and analyzed for 28 urinary VOC biomarkers. Differences in metabolite concentrations between the two groups were compared.ResultsTwenty two of the VOC metabolites were detected in at least one urine sample...
May 16, 2018: Pediatric Research
https://www.readbyqxmd.com/read/29763549/development-of-positron-emission-tomography-pet-radiotracers-for-the-gaba-transporter-1-gat-1
#10
Alexandra R Sowa, Allen F Brooks, Xia Shao, Bradford D Henderson, Phillip S Sherman, Janna Arteaga, Jenelle Stauff, Adam C Lee, Robert A Koeppe, Peter J H Scott, Michael R Kilbourn
In vivo PET imaging of the γ-aminobutyric acid (GABA) receptor complex has been accomplished using radiolabeled benzodiazepine derivatives, but development of specific presynaptic radioligands targeting the neuronal membrane GABA transporter type 1 (GAT-1) has been less successful. The availability of new structure-activity studies of GAT-1 inhibitors and the introduction of a GAT-1 inhibitor (tiagabine, Gabatril® ) into clinical use prompted us to reinvestigate the syntheses of PET ligands for this transporter...
May 15, 2018: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29755967/metal-mediated-halogen-exchange-in-aryl-and-vinyl-halides-a-review
#11
REVIEW
Gwilherm Evano, Antoine Nitelet, Pierre Thilmany, Damien F Dewez
Halogenated arenes and alkenes are of prime importance in many areas of science, especially in the pharmaceutical, agrochemical, and chemical industries. While the simplest ones are commercially available, some of them are still hardly accessible depending on their substitution patterns and the nature of the halogen atom. Reactions enabling the selective and efficient replacement of the halogen atom of an aryl or alkenyl halide by another one, lighter, or heavier, are therefore of major importance since they can be used for example to turn a less reactive aryl/alkenyl chloride into the more reactive iodinated derivatives or, in a reversed sense, to block an undesired reactivity, for late-stage modifications or for the introduction of a radionuclide...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29743426/extracellular-bio-imaging-of-acetylcholine-stimulated-pc12-cells-using-a-calcium-and-potassium-multi-ion-image-sensor
#12
Sota Matsuba, Ryo Kato, Koichi Okumura, Kazuaki Sawada, Toshiaki Hattori
In biochemistry, Ca2+ and K+ play essential roles to control signal transduction. Much interest has been focused on ion-imaging, which facilitates understanding of their ion flux dynamics. In this paper, we report a calcium and potassium multi-ion image sensor and its application to living cells (PC12). The multi-ion sensor had two selective plasticized poly(vinyl chloride) membranes containing ionophores. Each region on the sensor responded to only the corresponding ion. The multi-ion sensor has many advantages including not only label-free and real-time measurement but also simultaneous detection of Ca2+ and K+ ...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29734110/calixarene-doped-pvc-polymeric-films-as-size-selective-optical-sensors-monitoring-of-salicylate-in-real-samples
#13
Fatehy M Abdel-Haleem, Rasha M El Nashar
Preparation of novel salicylate-selective optical sensors (bulk optodes) was performed and applied successfully for salicylate determination in pharmaceutical formulations, Aspirin® and Aspocid®. t-butyl calix[4]arene ionophore was incorporated in a plasticized poly (vinyl-chloride) membrane containing the chromoionophore ETH5294 (O1 ) or ETH7075 (O5 ). The optical response to salicylate was due to size-selective extraction of salicylate from the aqueous solution to the optode bulk through formation of hydrogen bond accompanied by chromoionophore protonation, that resulted in the optical response at 680 or 540 nm for O1 or O5 , respectively...
May 1, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29727174/exposure-to-vinyl-chloride-and-its-influence-on-western-diet-induced-cardiac-remodeling
#14
Yaqin Liang, Anna L Lang, Jian Zhang, Jing Chen, Kai Wang, Liya Chen, Juliane I Beier, Yan Qian, Lu Cai
Obesity, usually caused by high fat diets (HFD), is a major public health issue worldwide, causing obesity associated cardiomyopathy. Moreover, the environmental toxicant vinyl chloride (VC) can exacerbate HFD-induced fatty liver disease. However, whether VC serves to enhance obesity-associated cardiomyopathy remains unclear. This study aims to investigate the interaction of western diet (WD) containing relatively low fat (42%) with VC on cardiac remodeling and its underling mechanisms. Adult male C57BL/6J mice were exposed to WD coinhalation of low-dose VC (<1 ppm/d) for 12 weeks...
May 10, 2018: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29726308/influence-of-acrylonitrile-butadiene-rubber-on-recyclability-of-blends-prepared-from-poly-vinyl-chloride-and-poly-methyl-methacrylate
#15
Sunil S Suresh, Smita Mohanty, Sanjay K Nayak
The current investigation deals with the recycling possibilities of poly(vinyl chloride) and poly(methyl methacrylate) in the presence of acrylonitrile butadiene rubber. Recycled blends of poly(vinyl chloride)/poly(methyl methacrylate) are successfully formed from the plastic constituents, those are recovered from waste computer products. However, lower impact performance of the blend and lower stability of the poly(vinyl chloride) phase in the recycled blend restricts its further usage in industrial purposes...
May 1, 2018: Waste Management & Research
https://www.readbyqxmd.com/read/29719576/chlorination-of-phenylallene-derivatives-with-1-chloro-1-2-benziodoxol-3-one-synthesis-of-vicinal-dichlorides-and-chlorodienes
#16
Zhensheng Zhao, Graham K Murphy
Allyl and vinyl chlorides represent important structural motifs in organic chemistry. Herein is described the chemoselective and regioselective reaction of aryl- and α-substituted phenylallenes with the hypervalent iodine (HVI) reagent 1-chloro-1,2-benziodoxol-3-one. The reaction typically results in vicinal dichlorides, except with proton-containing α-alkyl substituents, which instead give chlorinated dienes as the major product. Experimental evidence suggests that a radical mechanism is involved.
2018: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29717310/stereodynamic-insight-into-the-thermal-history-effects-on-poly-vinyl-chloride-calorimetric-sub-glass-and-glass-transitions-as-a-fragile-glass-model
#17
Jean-Mathieu Pin, Ehsan Behazin, Manjusri Misra, Amar Mohanty
The dynamic thermal history impact of poly(vinyl chloride) (PVC) has been explored for a wide range of pre-cooling rates, from 1 to 30 °C min-1. A first macroscopic insight into the dynamic thermal history influence has been highlighted through a decrease in the apparent activation energy (Eapp) in the first stage of the glass transition. The overall glass transition Eapp surface was successfully modeled in a polynomial fashion regarding the pre-cooling range. Raman scattering was used to associate the Eapp variations along the glass transition conversion with the stereochemistry evolution during the polymeric relaxation...
May 2, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29694937/migration-of-plasticizers-from-poly-vinyl-chloride-and-multilayer-infusion-bags-using-selective-extraction-and-gc-ms
#18
Zohra Haned, Saad Moulay, Silvia Lacorte
Flexible poly(vinyl chloride) (PVC) is widely used in the pharmaceutical industry for the manufacture of medical devices (tubes, probes, bags, primary packaging, etc.). The objective of the present study was to develop a procedure to evaluate the migration potential of nine plastic additives in aqueous infusion bags (NaCl 0.9% and glucose 5%): five phthalates, one adipate, two alkylphenols, and benzophenone. Two types of materials were analyzed: (i) new and outdated plasticized PVC (containing 40% of diethylhexyl phthalate DEHP); and (ii) tri-laminate polyethylene-polyamide-polypropylene, a multilayer material presumably exempt from DEHP...
April 12, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29684738/characterization-and-flux-assessment-of-airborne-phthalates-released-from-polyvinyl-chloride-consumer-goods
#19
Sang-Hee Jo, Min-Hee Lee, Ki-Hyun Kim, Pawan Kumar
The concentrations and fluxes of airborne phthalates were measured from five types of polyvinyl chloride (PVC) consumer products (vinyl flooring, wallcovering, child's toy, yoga mat, and edge protector) using a small chamber (impinger) system. Airborne phthalates released from each of those PVC samples were collected using sorbent (Tenax TA) tubes at three temperature control intervals (0, 3, and 6 h) under varying temperature conditions (25, 40, and 90 °C). A total of 11 phthalate compounds were quantified in the five PVC products examined in this study...
August 2018: Environmental Research
https://www.readbyqxmd.com/read/29666852/methylene-bridged-bimetallic-bis-imino-pyridine-cobaltous-chlorides-as-precatalysts-for-vinyl-terminated-polyethylene-waxes
#20
Qiang Chen, Wenjuan Zhang, Gregory A Solan, Tongling Liang, Wen-Hua Sun
Four examples of phenol-substituted methylene-bridged bis(imino)pyridines, CH(C6H4-4-OH){2'-(4-C6H2-2,6-R22N[double bond, length as m-dash]CMe)-6'-(2'',6''-R12C6H3N[double bond, length as m-dash]CMe)C5H3N}2 [R1 = R2 = Me L1, R1 = R2 = Et L2, R1 = Et, R2 = Me L3, R1 = iPr, R2 = Me L4], have been synthesized and fully characterized. Treatment of L1-L4 with two equivalents of cobaltous chloride affords the bimetallic complexes, [(L)Co2Cl4] (L = L1Co1, L2Co2, L3Co3, L4Co4), in good yield. The molecular structure of Co1 shows the two metal centers to be separated by a distance of 13...
May 1, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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