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https://www.readbyqxmd.com/read/29155574/mechanism-of-formation-of-chlorinated-pyrene-during-combustion-of-polyvinyl-chloride
#1
Yuichi Miyake, Masahiro Tokumura, Qi Wang, Takashi Amagai, Yuichi Horii, Kurunthachalam Kannan
Chlorinated polycyclic aromatic hydrocarbons (ClPAHs) are an emerging class of environmental contaminants, but the sources of ClPAHs in the environment are not well known. In this study, we developed a kinetic model describing the chlorination of PAHs to observe the mechanism of formation of ClPAHs during the combustion of organic waste containing chlorinated compounds and/or chloride in an incinerator. Pyrene (Pyr) and polyvinyl chloride (PVC) were selected as a model PAH and a model organic substrate, respectively...
November 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29154430/lower-than-expected-burden-of-premature-ventricular-contractions-impairs-myocardial-function
#2
Øyvind H Lie, Jørg Saberniak, Lars A Dejgaard, Mathis K Stokke, Finn Hegbom, Ole-Gunnar Anfinsen, Thor Edvardsen, Kristina H Haugaa
AIMS: We aimed to explore the burden of frequent premature ventricular contractions (PVCs) associated with myocardial dysfunction in patients with outflow tract arrhythmia (OTA). We hypothesized that this threshold is lower than the previously suggested threshold of 24 000 PVCs/24 h (24%PVC) when systolic function is assessed by strain echocardiography. Furthermore, we aimed to characterize OTA patients with malignant arrhythmic events. METHODS AND RESULTS: We included 52 patients referred for OTA ablation (46 ± 12 years, 58% female)...
November 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29154114/prevalence-and-predictors-of-phthalate-exposure-in-pregnant-women-in-charleston-sc
#3
Abby G Wenzel, John W Brock, Lori Cruze, Roger B Newman, Elizabeth R Unal, Bethany J Wolf, Stephen E Somerville, John R Kucklick
Phthalates are plasticizers commonly detected in human urine due to widespread exposure from PVC plastics, food packaging, and personal care products. Several phthalates are known antiandrogenic endocrine disruptors, which raises concern for prenatal exposure during critical windows of fetal development. While phthalate exposure is ubiquitous, certain demographics are subject to greater or lesser exposure. We sampled urine from 378 pregnant women during the second trimester of gestation living in Charleston, SC, and measured eight urinary phthalate metabolites as biomarkers of phthalate exposure: monobutyl phthalate (MBP), monobenzyl phthalate (MBzP), mono(2-ethylhexyl) phthalate (MEHP), mono(2-ethyl-5-oxohexyl) phthalate (MEOHP), mono(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), monoethyl phthalate (MEP), monoisobutyl phthalate (MiBP), and monomethyl phthalate (MMP)...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29149624/a-pvc-polypyrrole-sensor-designed-for-beef-taste-detection-using-electrochemical-methods-and-sensory-evaluation
#4
Lingtao Zhu, Xiaodan Wang, Yunxiu Han, Yingming Cai, Jiahui Jin, Hongmei Wang, Liping Xu, Ruijia Wu
An electrochemical sensor for detection of beef taste was designed in this study. This sensor was based on the structure of polyvinyl chloride/polypyrrole (PVC/PPy), which was polymerized onto the surface of a platinum (Pt) electrode to form a Pt-PPy-PVC film. Detecting by electrochemical methods, the sensor was well characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The sensor was applied to detect 10 rib-eye beef samples and the accuracy of the new sensor was validated by sensory evaluation and ion sensor detection...
November 4, 2017: Meat Science
https://www.readbyqxmd.com/read/29146274/effects-of-angiotensin-neprilysin-inhibition-as-compared-to-angiotensin-inhibition-on-ventricular-arrhythmias-in-reduced-ejection-fraction-patients-under-continuous-remote-monitoring-of-implantable-defibrillator-devices
#5
Carlos de Diego, Luis González-Torres, José María Núñez, Raúl Centurión Inda, David A Martin-Langerwerf, Antonio D Sangio, Piotr Chochowski, Pilar Casasnovas, Julio C Blazquéz, Jesús Almendral
BACKGROUND: Angiotensin-neprilysin inhibition as compared to angiotensin inhibition decreased sudden cardiac death in reduced ejection fraction heart failure (rEFHF). The precise mechanism remains unclear. OBJECTIVE: To explore the effect of angiotensin-neprilysin inhibition on ventricular arrhythmias as compared to angiotensin inhibition in rEFHF patients with an implantable cardiac defibrillator (ICD) and remote monitoring. METHODS: We prospectively included 120 patients with ICD and: 1) New York Heart Association functional class≥ II, 2) left ventricular ejection fraction (LVEF) ≤40%, 3) remote monitoring...
November 13, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29143829/spectral-properties-of-ionic-benzotristhiazole-based-donor-acceptor-nlo-phores-in-polymer-matrices-and-their-one-and-two-photon-cellular-imaging-ability
#6
M Danko, P Hrdlovič, A Martinická, A Benda, M Cigáň
A series of ionic benzotristhiazolium (BTT) push-pull chromophores, with different nitrogen donor groups and different lengths of conjugated bridges, was successfully doped in polar polymer matrices (PVC and PSS). The spectral (photophysical) properties of their low concentration thin polymeric films are compared with those in solution and are discussed in terms of matrix polarity/viscosity influence, specific polymer-chromophore interaction, structure-spectral property relationship and Twisted Intramolecular Charge-Transfer (TICT) state formation...
November 16, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29143792/polyphosphates-as-inhibitors-for-poly-vinyl-chloride-photodegradation
#7
Dina S Ahmed, Gamal A El-Hiti, Emad Yousif, Ayad S Hameed
Three polyphosphates were used as inhibitors for poly(vinyl chloride) (PVC) photodegradation. The polyphosphates were added to PVC at a concentration of 0.5% by weight. The PVC films (40 µm thickness) were irradiated at room temperature with ultraviolet (UV) light for up to 300 h. The changes in PVC films after irradiation were monitored by Fourier transform infrared spectroscopy, weight loss, viscosity-average molecular weight determination, and atomic force microscopy. These changes were very noticeable in the blank PVC films compared to the ones obtained when additives were used...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29137802/nanocomposite-materials-based-on-poly-vinyl-chloride-and-bovine-serum-albumin-modified-zno-through-ultrasonic-irradiation-as-a-green-technique-optical-thermal-mechanical-and-morphological-properties
#8
Shadpour Mallakpour, Marzieh Darvishzadeh
In this project, physicochemical properties of poly(vinyl chloride) (PVC) reinforced by ZnO nanoparticles (NPs) were studied. Firstly, ZnO NPs were modified with bovine serum albumin (BSA) as an organo-modifier and biocompatible substance through ultrasound irradiation as environmental friendly, low cost and rapid means. Nanocomposite (NC) films were prepared by loadings of various ratios of ZnO/BSA NPs (3, 6 and 9wt%) inside the PVC. Structural morphology and physical properties of the ZnO-BSA NPs and NC films were investigated via Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis (TGA), transmission electron microscopy and field emission scanning electron microscopy...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137762/ultrasonic-promoted-rapid-preparation-of-pvc-tio2-bsa-nanocomposites-characterization-and-photocatalytic-degradation-of-methylene-blue
#9
Shadpour Mallakpour, Sima Shamsaddinimotlagh
In the present project in order to prevent agglomeration and better dispersion of TiO2 nanoparticles (NPs) in the poly(vinyl chloride) (PVC) matrix, initially, the surface of TiO2 NPs was covered by bovine serum albumin protein (BSA) via sonication method. Then, the TiO2-BSA powders were embedded into the PVC matrix using ultrasonic irradiations. With mechanical and magnetic stirring homogenous mixture was not obtained. So sonication process was very essential and vital. Physical, chemical and structural properties of the samples were investigated with various tools...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137761/ultrasound-assisted-surface-treatment-of-zro2-with-bsa-and-incorporating-in-pvc-to-improve-the-properties-of-the-obtained-nanocomposites-fabrication-and-characterization
#10
Shadpour Mallakpour, Zahra Hajjari
This paper describes the preparation of poly(vinyl chloride) (PVC) nanocomposites (NCs) reinforced with modified zirconia (ZrO2) nanoparticles (NPs). The ZrO2 NPs were defined as efficient filler for PVC NCs. For achieving the best dispersion and improvement of properties, the surface of ZrO2 NPs was modified by Bovine Serum Albumin (BSA). Carboxylic acids and amines are important functional groups of BSA which handle the grafting BSA on the surface of ZrO2 NPs. The PVC/ZrO2-BSA NCs were fabricated by incorporation of various amounts of the ZrO2-BSA NPs (3, 6 and 9wt%) into PVC matrix...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137752/microwave-and-ultrasound-assisted-synthesis-of-poly-vinyl-chloride-riboflavin-modified-mwcnts-examination-of-thermal-mechanical-and-morphology-properties
#11
Amir Abdolmaleki, Shadpour Mallakpour, Faezeh Azimi
This study focused on the preparation and investigation of physicochemical features of new poly(vinyl chloride) (PVC) nanocomposites (NCs) including different amounts of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) functionalized with riboflavin (RIB). Firstly, to increase the hydrophilicity of MWCNTs, the surface of them was functionalized by incorporating and formation of ester groups with RIB as a low cost and environmentally friendly biomolecule through ultrasound and microwave irradiations...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137676/a-medium-invasiveness-multi-level-patient-s-specific-template-for-pedicle-screw-placement-in-the-scoliosis-surgery
#12
Farhad Azimifar, Kamran Hassani, Amir Hossein Saveh, Farhad Tabatabai Ghomsheh
BACKGROUND: Several methods including free-hand technique, fluoroscopic guidance, image-guided navigation, computer-assisted surgery system, robotic platform and patient's specific templates are being used for pedicle screw placement. These methods have screw misplacements and are not always easy to be applied. Furthermore, it is necessary to expose completely a large portions of the spine in order to access fit entirely around the vertebrae. METHODS: In this study, a multi-level patient's specific template with medium invasiveness was proposed for pedicle screw placement in the scoliosis surgery...
November 14, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29137158/chemically-modified-polyvinyl-chloride-for-removal-of-thionine-dye-lauth-s-violet
#13
Helena Ma A M M S Ali, Cleuzilene V Silva, Betina Royer, Guimes Rodrigues Filho, Daniel A Cerqueira, Rosana M N Assunção
The chemical modification of hydrophobic polymer matrices is an alternative way to elchange their surface properties. The introduction of sulfonic groups in the polymer changes the surface properties such as adhesion, wettability, catalytic ability, and adsorption capacity. This work describes the production and application of chemically modified polyvinyl chloride (PVC) as adsorbent for dyes removal. Chemical modification of PVC was evaluated by infrared spectroscopy and elemental analysis, which indicated the presence of sulfonic groups on PVC...
November 12, 2017: Materials
https://www.readbyqxmd.com/read/29136530/microplastic-particles-cause-intestinal-damage-and-other-adverse-effects-in-zebrafish-danio-rerio-and-nematode-caenorhabditis-elegans
#14
Lili Lei, Siyu Wu, Shibo Lu, Mengting Liu, Yang Song, Zhenhuan Fu, Huahong Shi, Kathleen M Raley-Susman, Defu He
Microplastics have been frequently detected in aquatic environments, and there are increasing concerns about potential effects on biota. In this study, zebrafish Danio rerio and nematode Caenorhabditis elegans were used as model organisms for microplastic exposure in freshwater pelagic (i.e. water column) and benthic (i.e. sediment) environments. We investigated the toxic effects of five common types of microplastics: polyamides (PA), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polystyrene (PS) particles...
November 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29130071/the-electrophysiological-substrate-of-early-repolarization-syndrome-noninvasive-mapping-in-patients
#15
Junjie Zhang, Mélèze Hocini, Maria Strom, Phillip S Cuculich, Daniel H Cooper, Frédéric Sacher, Michel Haïssaguerre, Yoram Rudy
Background: The early repolarization (ER) pattern is a common ECG finding. Recent studies established a definitive clinical association between ER and fatal ventricular arrhythmias. However, the arrhythmogenic substrate of ER in the intact human heart has not been characterized. Objectives: To map the epicardial electrophysiological (EP) substrate in ER syndrome patients using noninvasive Electrocardiographic Imaging (ECGI), and to characterize substrate properties that support arrhythmogenicity...
August 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29129863/origin-of-the-optical-response-of-a-dye-doped-plasticized-poly-vinyl-chloride-based-photonic-crystal-ion-sensor
#16
Shoma Aki, Kenji Sueyoshi, Hideaki Hisamoto, Tatsuro Endo
We investigated the origin of the optical responses of a two-dimensional photonic crystal (2D-PhC) optode membrane ion sensor based on plasticized poly(vinyl chloride) (PVC) containing lipophilic dye. We previously developed a highly sensitive potassium ion sensor. However, the contributions of various factors to the sensor's optical response could not be distinguished. Here, we synthesized a lipophilic dye with spectral changes that do not overlap with those of propagated light in the PhC. Using this synthesized dye excluded the contribution of light absorption by the dye to the peak intensity change of the ion sensor...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29129466/a-discrimination-model-in-waste-plastics-sorting-using-nir-hyperspectral-imaging-system
#17
Yan Zheng, Jiarui Bai, Jingna Xu, Xiayang Li, Yimin Zhang
Classification of plastics is important in the recycling industry. A plastic identification model in the near infrared spectroscopy wavelength range 1000-2500 nm is proposed for the characterization and sorting of waste plastics using acrylonitrile butadiene styrene (ABS), polystyrene (PS), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC). The model is built by the feature wavelengths of standard samples applying the principle component analysis (PCA), and the accuracy, property and cross-validation of the model were analyzed...
November 9, 2017: Waste Management
https://www.readbyqxmd.com/read/29126634/-antiepileptic-drugs-administration-by-nasogastric-tube-in-comatose-patients
#18
Rim Charfi, Ramla Mizouri, Mouna Ben Sassi, Emna Gaies, Hanene Eljebari, Nadia Jebabli, Sarrah Zereï, Fatma Ben Salem, Dorra Ben Said, Anis Klouz, Riadh Daghfous, Issam Salouage, Sameh Trabelsi
AIM: To evaluate the modalities of administration of antiepileptic drugs (AED) with nasogastric tube (NGT) by nurses and to draw up recommendations. METHODS: Our study consisted on investigating the modalities of administration of AED's with NGT by nurses during four months. We prepared 10 questions including demographic information. Participation was voluntary and anonymous. The questionnaire was distributed in seven intensive care departments after authorization of each head of the department...
October 12, 2017: Thérapie
https://www.readbyqxmd.com/read/29124088/considerations-and-code-for-partial-volume-correcting-18-f-av-1451-tau-pet-data
#19
Suzanne L Baker, Anne Maass, William J Jagust
[(18)F]-AV-1451 is a leading tracer used with positron emission tomography (PET) to quantify tau pathology. However, [(18)F]-AV-1451 shows "off target" or non-specific binding, which we define as binding of the tracer in unexpected areas unlikely to harbor aggregated tau based on autopsy literature [1]. Along with caudate, putamen, pallidum and thalamus non-specific binding [2], [3], we have found binding in the superior portion of the cerebellar gray matter, leading us to use inferior cerebellar gray as the reference region...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29114213/visually-evoked-visual-auditory-changes-associated-with-auditory-performance-in-children-with-cochlear-implants
#20
Maojin Liang, Junpeng Zhang, Jiahao Liu, Yuebo Chen, Yuexin Cai, Xianjun Wang, Junbo Wang, Xueyuan Zhang, Suijun Chen, Xianghui Li, Ling Chen, Yiqing Zheng
Activation of the auditory cortex by visual stimuli has been reported in deaf children. In cochlear implant (CI) patients, a residual, more intense cortical activation in the frontotemporal areas in response to photo stimuli was found to be positively associated with poor auditory performance. Our study aimed to investigate the mechanism by which visual processing in CI users activates the auditory-associated cortex during the period after cochlear implantation as well as its relation to CI outcomes. Twenty prelingually deaf children with CI were recruited...
2017: Frontiers in Human Neuroscience
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