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Mahroo Khaleghi, Khadijeh Didehban, Meisam Shabanian
Melamine terephthaldehyde modified graphene oxide (MTR-GO) with optimum content was easily prepared via ultrasonication method and used as anti-corrosion additive for Poly (vinyl chloride) (PVC). The effects of ultrasonicated MTR-GO on the mechanical, chemical and thermal resistance of the PVC were thoroughly studied. Change percentage of tensile strength and weight change percentage of PVC (P) and PVC/MTR-GO nanocomposite (PN) in acetone and sodium hypochlorite (NaClO) media at two different exposure temperature (20 °C and 50 °C) were examined...
May 2018: Ultrasonics Sonochemistry
Ruilong Li, Huadong Tan, Linlin Zhang, Shaopeng Wang, Yinghui Wang, Kefu Yu
Microplastics sorption of persistent organic pollutants (POPs) was the core processes that cause negative effects to biota, and their influencing factors and related mechanisms are poorly understood. In this study, we explored the impacts of water extractable organic matter (WEOM), an important source of endogenous dissolved organic matter in mangrove sediment, on the sorption coefficients of typical parent, alkyl and N/O/S-containing polycyclic aromatic hydrocarbons (PAHs) by microplastics. The presence of L-WEOM (D) impeded the PAHs sorption as the coefficients (Kf ) decreased to 10...
March 15, 2018: Ecotoxicology and Environmental Safety
Edel Jannecke Svendsen, Anne Moen, Reidar Pedersen, Ida Torunn Bjørk
PURPOSE: The purpose of this study was to provide a better understanding of how parents experience the use of restraint during the performance of peripheral vein cannulation (PVC) on their child. DESIGN/METHODS: Qualitative, semi-structured interviews were performed with seven parents and one close relative who had accompanied their 3-5-year-old child while the child resisted the medical procedure of PVC. The analysis was guided by symbolic interactionism and resulted in two themes...
March 13, 2018: Journal of Pediatric Nursing
Leila Ibrahimi Ghavamabadi, Behzad Fouladi Dehaghi, Morteza Hesampour, Kambiz Ahmadi Angali
BACKGROUND: Use of hearing protection devices (HPDs) has become necessary when other control measures cannot reduce noise to a safe and standard level. In most countries, more effective hearing protection devices are in demand. OBJECTIVE: The aim of this study was to examine the effects of titanium dioxide (TiO2 ) nanoparticles on noise reduction efficiency in a polyvinyl chloride (PVC) earplug. METHODS: An S-60 type PVC polymer as main matrix and TiO2 with 30 nm size were used...
March 13, 2018: International Journal of Occupational Safety and Ergonomics: JOSE
Giuseppe Bonifazi, Giuseppe Capobianco, Silvia Serranti
The aim of this work was to recognize different polymer flakes from mixed plastic waste through an innovative hierarchical classification strategy based on hyperspectral imaging, with particular reference to low density polyethylene (LDPE) and high-density polyethylene (HDPE). A plastic waste composition assessment, including also LDPE and HDPE identification, may help to define optimal recycling strategies for product quality control. Correct handling of plastic waste is essential for its further "sustainable" recovery, maximizing the sorting performance in particular for plastics with similar characteristics as LDPE and HDPE...
March 3, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jia Li, Kaina Zhang, Hua Zhang
Microplastics and antibiotics are two classes of emerging contaminants with proposed negative impacts to aqueous ecosystems. Adsorption of antibiotics on microplastics may result in their long-range transport and may cause compound combination effects. In this study, we investigated the adsorption of 5 antibiotics [sulfadiazine (SDZ), amoxicillin (AMX), tetracycline (TC), ciprofloxacin (CIP), and trimethoprim (TMP)] on 5 types of microplastics [polyethylene (PE), polystyrene (PS), polypropylene (PP), polyamide (PA), and polyvinyl chloride (PVC)] in the freshwater and seawater systems...
March 3, 2018: Environmental Pollution
Katherine S Carlos, Lowri S deJager, Timothy H Begley
PVC is a common food contact material that is usually plasticized to increase its flexibility. Phthalates are one class of chemical compounds that are often used as plasticizers in PVC in a wide range of industries. They may be used in packaging materials for foods and can also be found in components of certain food processing equipment such as conveyor belts and tubing. Transfer of plasticizers from packaging to foods can occur. In recent years, there has been increased interest in understanding the health effects of phthalates, as well as the possible human exposure levels...
March 6, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
B J Klehm, D A King, A C Dilger, S D Shackelford, D D Boler
The objective was to determine the interactions between packaging type and degree of doneness on sensory traits of pork loins classified based on the newly proposed USDA quality grades. A total of 144 loins were selected from 2 groups of pigs (lean growth or meat quality production focus) to represent as much variation in visual color and marbling as possible. Selection was achieved with a VQG grading camera. The ventral surface of the loins were evaluated for loin quality traits at 1 d postmortem. At 2 d postmortem loins were sliced into 28 mm thick chops...
March 2, 2018: Journal of Animal Science
Prabhpreet Singh, Amit Noheria
Invasive electrophysiology (EP) mapping and catheter ablation has increasingly become the standard of care for many cardiac arrhythmias like supraventricular tachycardias, atrial fibrillation, premature ventricular complexes (PVC), and monomorphic ventricular tachycardia. In this review, we discuss the recent progress made in the mapping and ablation of ventricular fibrillation (VF). Ventricular activation during VF is apparently disorganized, making mapping and interpretation difficult. Prolonged mapping during VF would require mechanical circulatory support as VF causes complete hemodynamic collapse...
March 6, 2018: Current Treatment Options in Cardiovascular Medicine
Zongkui Chen, Xianping Tao, Aziz Khan, Daniel K Y Tan, Honghai Luo
Limitations of soil water and nitrogen (N) are factors which cause a substantial reduction in cotton ( Gossypium hirsutum L.) yield, especially in an arid environment. Suitable management decisions like irrigation method and nitrogen fertilization are the key yield improvement technologies in cotton production systems. Therefore, we hypothesized that optimal water-N supply can increase cotton plant biomass accumulation by maintaining leaf photosynthetic capacity and improving root growth. An outdoor polyvinyl chloride (PVC) tube study was conducted to investigate the effects of two water-N application depths, i...
2018: Frontiers in Plant Science
Rafael Batista Rebouças, Rodrigo Campos Monteiro, João Paulo Pereira Lima, Filipe Pádua B F Almeida, Cesar Araujo Britto, Marcos Tobias-Machado, Carlo Passerotti
INTRODUCTION: Preservation of urinary continence is a great challenge in Radical Prostatectomy. In order to improve functional results, Asimakopoulos et al. (2010) described a robot-assisted surgical technique with preservation of the pubovesical complex (PVC). We present a pure laparoscopic execution. PRESENTATION: A 61-year-old male patient with a diagnosis of prostate cancer, with PSA 6.54ng/ml, DRE: T1C and Gleason 6 (3+3) 1/12 fragments. All therapeutic possibilities were discussed, including active surveillance...
March 1, 2018: International Braz J Urol: Official Journal of the Brazilian Society of Urology
Choon Ok Kim, Jeongyun Song, Ji Young Min, Su Jung Park, Hye Mi Lee, Hyo-Jin Byon
BACKGROUND: There is a risk of drug sorption into an intravenous administration set composed of polyvinyl chloride (PVC), polyurethane (PU), or polyolefin (PO). This has implications on the dose of the active ingredient the patient receives, and thus therapeutic success. This study aimed to determine the plasma concentration of nitroglycerin and the effect of nitroglycerin on patients based on the composition of the administration set. METHODS: Using a randomized, open-labeled, 3 × 3 crossover method, 9 volunteers were assigned to 3 groups...
March 2018: Medicine (Baltimore)
Adam Lee, Russell Denman, Haris M Haqqani
BACKGROUND: Ectopy-mediated cardiomyopathy (EMC) is a potentially reversible form of left ventricular systolic dysfunction. Various risk factors for the development of EMC have been proposed in the literature. We aim to assess medium term outcomes of focal ventricular arrhythmia (VA) ablation in the setting of cardiomyopathy (CMP) and to validate published risk factors for EMC. METHODS: Medium term recovery of left ventricular (LV) function and freedom from VA recurrence was assessed and compared between patients undergoing focal VA ablation in the setting of CMP and a control group with normal LV function...
February 12, 2018: Heart, Lung & Circulation
J Fedida, T Strisciuglio, M Sohal, M Wolf, K Van Beeumen, A Neyrinck, P Taghji, C Lepiece, A Almorad, Y Vandekerckhove, R Tavernier, M Duytschaever, S Knecht
PURPOSE: Catheter ablation is an effective treatment for premature ventricular complexes (PVCs). Activation mapping is accurate but requires PVCs at the time of the ablation. Pace-mapping correlation (PMC) is a supplemental tool recently developed as an integrated module for an electro-anatomical mapping platform. Our study sought to investigate whether pace-mapping technology provides similar ablation results in patients with low versus high idiopathic PVC burden at the time of ablation and the relationship between sites with the highest PMC and the earliest local activation time (LAT)...
February 24, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Mikaël Kedzierski, Mélanie D'Almeida, Anthony Magueresse, Adélaïde Le Grand, Hélène Duval, Guy César, Olivier Sire, Stéphane Bruzaud, Véronique Le Tilly
Ageing of various plastics in marine environment was monitored after immersion of two synthetic (polyvinylchloride, PVC, and polyethylene terephthalate, PET) and one biodegradable (poly(butylene adipate co-terephtalate), PBAT) plastics for 502days in the bay of Lorient (Brittany, France). Data analysis indicates that aged PVC rapidly releases estrogenic compounds in seawater with a later adsorption of heavy metals; PET undergoes a low weakening of the surface whereas no estrogenic activity is detected; PBAT ages faster in marine environment than PVC...
February 2018: Marine Pollution Bulletin
Lise Bernard, Teuta Eljezi, Hélène Clauson, Céline Lambert, Yassine Bouattour, Philip Chennell, Bruno Pereira, Valérie Sautou
Infusion medical devices (MDs) used in hospitals are often made of plasticized polyvinylchloride (PVC). These plasticizers may leach out into infused solutions during clinical practice, especially during risk-situations, e.g multiple infusions in Intensive Care Units and thus may enter into contact with the patients. The migrability of the plasticizers is dependent of several clinical parameters such as temperature, contact time, nature of the simulant, etc… However, no data is available about the influence of the flow rate at which drug solutions are administrated...
2018: PloS One
Calvin Tong, Marla Kiess, Marc William Deyell, Michael Qiu, Merav Orgad, Valerie Rychel, Ariel Claman, Emma Hardwick, Beverly McCarthy, Candice K Silversides, Jasmine Grewal
OBJECTIVES: To determine cardiac and fetal/neonatal event rates among pregnant women with premature ventricular contractions (PVCs) and compare with control groups. METHODS: Prospective case-control cohort study: 53 consecutive pregnancies in 49 women referred to the St. Paul's Hospital between 2010 and 2016 with PVC burden >1% in women without underlying cardiac disease. Maternal cardiac and fetal/neonatal outcomes were compared with two pregnant control groups: (1) supraventricular tachycardia (SVT) group of 53 women referred for a history of SVT/SVT in the current pregnancy and (2) low-risk group of 53 women with no cardiac disease...
February 20, 2018: Heart: Official Journal of the British Cardiac Society
Andrew Turner
Samples of plastic collected from two beaches in southwest England (n = 185) have been analysed by XRF spectrometry for elements that are hazardous or restricted in synthetic polymers (namely, As, Ba, Br, Cd, Cr, Hg, Pb, Sb and Se). Overall, one or more restricted element was detected in 151 samples, with 15 cases exhibiting non-compliance with respect to the Restriction of Hazardous Substances (RoHS) Directive. Twelve plastics that were RoHS-non-compliant were subsequently processed into microplastic-sized fragments and subjected to an avian physiologically-based extraction test (PBET) that simulates the chemical conditions in the gizzard-proventriculus of the northern fulmar...
February 15, 2018: Environmental Pollution
Ohidul Alam, Sijia Wang, Wentao Lu
One of the main worries for thermal treatment of plastic bag (PB) is the air pollution resulting from heavy metal (HM) evaporation and emission. The quest of the study was to investigate their fate during thermal treatment varying with temperature and atmosphere to explore the appropriate treatment technology. Four commonly consumed polymer bags such as PE, HDPE, LDPE and PVC were selected for the analysis. The elemental compositions, heating values and total metal contents of the samples were measured by an elemental analyzer, a sulphur/halogen analyzer, a bomb calorimeter and an ICP-OES, respectively...
February 14, 2018: Journal of Environmental Management
Jason S Bradfield, Olujimi A Ajijola, Marmar Vaseghi, Kalyanam Shivkumar
Ventricular arrhythmias are responsible for hundreds of thousands of deaths every year. Catheter ablation of ventricular tachycardia (VT) is an essential component of the management of these life-threatening arrhythmias. However, in many patients, despite medical and interventional therapy, VT recurs. Further, some VT substrates (mid-myocardial, left ventricular summit, intra-septal) are not easily targeted, due to limitations of currently available technology. In certain clinical settings, ventricular fibrillation (VF) episodes that have premature ventricular contraction (PVC) triggers can also be targeted with catheter ablation...
February 14, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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