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https://www.readbyqxmd.com/read/28801216/a-novel-process-for-separation-of-hazardous-poly-vinyl-chloride-from-mixed-plastic-wastes-by-froth-flotation
#1
Jianchao Wang, Hui Wang, Chongqing Wang, Lingling Zhang, Tao Wang, Long Zheng
A novel method, calcium hypochlorite (CHC) treatment, was proposed for separation of hazardous poly(vinyl chloride) (PVC) plastic from mixed plastic wastes (MPWs) by froth flotation. Flotation behavior of single plastic indicates that PVC can be separated from poly(ethylene terephthalate) (PET), poly(acrylonitrile-co-butadiene-co-styrene) (ABS), polystyrene (PS), polycarbonate (PC) and poly(methyl methacrylate) (PMMA) by froth flotation combined with CHC treatment. Mechanism of CHC treatment was examined by contact angle measurement, scanning electron microscopy, Fourier transform infrared and X-ray photoelectron spectroscopy...
August 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28796279/withdrawn-intermittent-catheterisation-for-long-term-bladder-management
#2
REVIEW
Jacqui Prieto, Catherine L Murphy, Katherine N Moore, Mandy Fader
BACKGROUND: Intermittent catheterisation is a commonly recommended procedure for people with incomplete bladder emptying. There are now several designs of intermittent catheter (e.g. different lengths, 'ready to use' presentation) with different materials (e.g. PVC-free) and coatings (e.g. hydrophilic). The most frequent complication of intermittent catheterisation is urinary tract infection (UTI), but satisfaction, preference and ease of use are also important to users. It is unclear which catheter designs, techniques or strategies affect the incidence of UTI, which are preferable to users and which are most cost effective...
August 8, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28792195/can-hydrophilic-coated-catheters-be-beneficial-for-the-public-healthcare-system-in-brazil-a-cost-effectiveness-analysis-in-patients-with-spinal-cord-injuries
#3
José Carlos Truzzi, Vanessa Teich, Camila Pepe
INTRODUCTION: Detrusor sphincter dyssynergia affects 70% to 80% of all spinal cord injury patients, resulting in increased risk of urinary tract infections (UTIs) and potential exposure to antimicrobial resistance. In Brazil, local guidelines recommend intermittent catheterization as the best method for bladder emptying, and two catheter types are available: the conventional uncoated PVC and the hydrophilic coated catheters. OBJECTIVE: To evaluate the cost-effectiveness of two types of catheters for intermittent catheterization from the perspective of the Brazilian public healthcare system...
August 8, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28752278/predictors-and-therapy-of-cardiomyopathy-caused-by-frequent-ventricular-ectopy
#4
REVIEW
Ghaith Sharaf Dabbagh, Frank Bogun
PURPOSE OF REVIEW: The aim of this review is to describe predictors and therapeutic principles for PVC-induced cardiomyopathy. RECENT FINDINGS: PVC-induced cardiomyopathy is a treatable condition resulting in a reversible form of cardiomyopathy. PVC-induced cardiomyopathy has only recently been recognized as an entity that causes a reversible form of cardiomyopathy. The mechanism of development of PVC-induced cardiomyopathy has not yet been elucidated, although dyssynchrony appears to play a major role...
September 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28745465/premature-ventricular-complexes-in-children-with-structurally-normal-hearts-clinical-review-and-recommendations-for-diagnosis-and-treatment
#5
Fabrizio Drago, Loira Leoni, Gabriele Bronzetti, Berardo Sarubbi, Giulio Porcedda
Premature ventricular complexes (PVCs) have always been a matter of debate among physicians and a cause for concern for family members of affected patients. The available literature on isolated PVCs in children is limited to case reports and small single-center retrospective series that are consistent in demonstrating the benign course of PVCs and their frequent disappearance during childhood, though many questions remain unanswered. Nevertheless, two key actions should be undertaken in pediatric patients with documented PVCs: 1) to rule out the presence of structural heart disease; 2) to determine whether symptoms are due to PVCs, or whether PVC frequency is responsible for left ventricular dysfunction...
October 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28732984/ultrasonic-assisted-biosurface-modification-of-multi-walled-carbon-nanotubes-with-thiamine-and-its-influence-on-the-properties-of-pvc-tm-mwcnts-nanocomposite-films
#6
Shadpour Mallakpour, Amir Abdolmaleki, Faezeh Azimi
The present paper represents a simple and efficient technique via ultrasonic irradiation, which utilized for chemical treatment of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) with Thiamine (Tm). Poly(vinyl chloride) (PVC) based nanocomposites (NC)s were prepared by the incorporation of various amounts of modified MWCNTs (4, 8, and 12wt%) within the PVC matrix by blending solution and ultrasonic distribution methods. The morphological, chemical structure and thermal stability of the PVC/Tm-MWCNT NCs were identified via Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, and thermogravimetric analysis...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28728505/in-vitro-comparison-of-stone-fragmentation-when-using-various-settings-with-modern-variable-pulse-holmium-lasers
#7
John Roger Bell, Kristina L Penniston, Stephen Y Nakada
INTRODUCTION AND OBJECTIVE There is limited data regarding optimal laser and energy settings during stone fragmentation. We assessed effects on fragmentation using a variety of energy and frequency settings with two laser systems. METHODS Artificial stones were created using BegoStone (Streeper et al 2016). A clear PVC tube with an inner diameter of 13mm was closed at one end with a removable plug to create the in vitro ureteral and calyceal environments. The Lumenis Pulse 120H and the Cook Rhapsody H-30 holmium lasers were studied in the calyceal and ureteral models...
July 20, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28713001/comparison-of-the-properties-of-implantable-matrices-prepared-from-degradable-and-non-degradable-polymers-for-bisphosphonate-delivery
#8
Tamás Sovány, Anna Csüllög, Ernő Benkő, Géza Regdon, Klára Pintye-Hódi
The aim of the present study was the development of directly compressed tablets for implantable delivery of risedronate sodium for osteoporosis treatment and the comparison of the mechanism and kinetics of drug release from biogradable (chitosan) and non-degradable (PVC) polymer matrices. The compositions and process parameters were optimized in accordance to a mixed 2 and 3 level full factorial design. Critical Quality Attributes (CQA), such as diametral breaking hardness, porosity and speed of drug dissolution were investigated...
July 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28710187/utility-of-microscope-integrated-optical-coherence-tomography-mioct-in-the-treatment-of-myopic-macular-hole-retinal-detachment
#9
Atul Kumar, Prateek Kakkar, Raghav Dinesh Ravani, Ashish Markan
Macular hole-associated retinal detachment in high myopia is described as a final stage in progression of myopic traction maculopathy (MTM).(1â€"3) Shimada et al(4) described the progressive stages of MTM from macular retinoschisis to serous retinal detachment in high myopia. Stage 4 MTM is characterised as disappearance of retinoschisis with progression to retinal detachment due to macular hole formation. It is hypothesised that vitreoschisis and abnormal vitreo-retinal interface create the premacular tangential traction...
July 14, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28696102/release-and-gas-particle-partitioning-behaviors-of-short-chain-chlorinated-paraffins-sccps-during-the-thermal-treatment-of-polyvinyl-chloride-flooring
#10
Faqiang Zhan, Haijun Zhang, Jing Wang, Jiazhi Xu, Heping Yuan, Yuan Gao, Fan Su, Jiping Chen
Chlorinated paraffin (CP) mixture is a common additive in polyvinyl chloride (PVC) products as a plasticizer and flame retardant. During the PVC plastic life cycle, intentional or incidental thermal processes inevitably cause an abrupt release of short-chain CPs (SCCPs). In this study, the thermal processing of PVC plastics was simulated by heating PVC flooring at 100-200 °C in a chamber. The 1 h thermal treatment caused the release of 1.9-10.7% of the embedded SCCPs. A developed emission model indicated that SCCP release was mainly controlled by material-gas partitioning at 100 °C...
July 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28647563/in-vitro-comparison-of-holmium-lasers-evidence-for-shorter-fragmentation-time-and-decreased-retropulsion-using-a-modern-variable-pulse-laser
#11
John Roger Bell, Kristina L Penniston, Stephen Y Nakada
OBJECTIVE: To compare the performance of variable and fixed pulse lasers on stone phantoms in vitro. METHODS: Seven millimeter stone phantoms were made to simulate calcium oxalate monohydrate stones using BegoStone Plus. The in vitro setting was created with a clear PVC tube. For each trial, a stone phantom was placed at the open end of the tubing. The Cook Rhapsody H-30 variable pulse laser was tested on both long and short pulse settings and compared to the Dornier H-20 fixed pulse laser, five trials were conducted for each trial arm...
June 21, 2017: Urology
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#12
Xiaoyang Shi, Qibin Li, Tao Wang, Klaus S Lackner
This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28623882/peripheral-venous-catheter-related-bloodstream-infection-is-associated-with-severe-complications-and-potential-death-a-retrospective-observational-study
#13
Akihiro Sato, Itaru Nakamura, Hiroaki Fujita, Ayaka Tsukimori, Takehito Kobayashi, Shinji Fukushima, Takeshi Fujii, Tetsuya Matsumoto
BACKGROUND: The purpose of this study was to identify the clinical characteristics and outcomes of peripheral vascular catheter-related bloodstream infections (PVC-BSIs) and determine the risk of severe complications or death. METHODS: We performed a retrospective observational study from June 2010 to April 2015 at two regional university-affiliated hospitals in Tokyo. We studied the clinical manifestations, underlying diseases, laboratory results, treatment methods, recurrence rates, and complications in 62 hospitalized patients diagnosed with PVC-BSIs by positive blood cultures...
June 17, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28614916/gestational-diabetes-affects-the-growth-and-functions-of-perivascular-stem-cells
#14
Borim An, Eunbi Kim, Haengseok Song, Kwon-Soo Ha, Eun-Taek Han, Won Sun Park, Tae Gyu Ahn, Se-Ran Yang, Sunghun Na, Seok-Ho Hong
Gestational diabetes mellitus (GDM), one of the common metabolic disorders of pregnancy, leads to functional alterations in various cells including stem cells as well as some abnormalities in fetal development. Perivascular stem cells (PVCs) have gained more attention in recent years, for the treatment of various diseases. However, the effect of GDM on PVC function has not been investigated. In our study, we isolated PVCs from umbilical cord of normal pregnant women and GDM patients and compared their phenotypes and function...
June 30, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28602304/an-umeclidinium-membrane-sensor-two-step-optimization-strategy-for-improved-responses
#15
Ali M Yehia, Hany H Monir
In the scientific context of membrane sensors and improved experimentation, we devised an experimentally designed protocol for sensor optimization. Two-step strategy was implemented for Umeclidinium bromide (UMEC) analysis which is a novel quinuclidine-based muscarinic antagonist used for maintenance treatment of symptoms accompanied with chronic obstructive pulmonary disease. In the first place, membrane components were screened for ideal ion exchanger, ionophore and plasticizer using three categorical factors at three levels in Taguchi design...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28597763/open-label-study-of-ambrisentan-in-patients-with-exercise-pulmonary-hypertension
#16
Sergio A Segrera, Laurie Lawler, Alexander R Opotowsky, David Systrom, Aaron B Waxman
A growing body of evidence suggests that exercise pulmonary hypertension (ePH) is an early form of pulmonary arterial hypertension (PAH). Identifying the disease at an early, potentially more responsive phase, and initiating treatment may improve functional status and prevent progression to severe forms of PAH. This was a single-center, open-label six-month treatment trial to evaluate the effect of ambrisentan on pulmonary hemodynamics and exercise capacity in ePH utilizing invasive cardiopulmonary exercise testing (iCPET)...
April 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28587792/breaking-fat-how-mycobacteria-and-other-intracellular-pathogens-manipulate-host-lipid-droplets
#17
REVIEW
Caroline Barisch, Thierry Soldati
Tuberculosis (Tb) is a lung infection caused by Mycobacterium tuberculosis (Mtb). With one third of the world population latently infected, it represents the most prevalent bacterial infectious diseases worldwide. Typically, persistence is linked to so-called "dormant" slow-growing bacteria, which have a low metabolic rate and a reduced response to antibiotic treatments. However, dormant bacteria regain growth and virulence when the immune system is weakened, leading again to the active form of the disease...
June 3, 2017: Biochimie
https://www.readbyqxmd.com/read/28578857/surface-treatment-with-fenton-for-separation-of-acrylonitrile-butadiene-styrene-and-polyvinylchloride-waste-plastics-by-flotation
#18
Jian-Chao Wang, Hui Wang, Luo-Luo Huang, Chong-Qing Wang
Surface treatment with Fenton was applied to flotation separation of acrylonitrile-butadienestyrene (ABS) and polyvinylchloride (PVC). After treatment, the floatability of ABS has a dramatic decrease, while the floatability of PVC is not affected. Fourier transform infrared spectroscopy (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS) spectra were recorded to ascertain the mechanism of Fenton treatment. FT-IR and XPS analysis confirms that the introduction of oxygen-containing group occurs on the surface of ABS...
June 1, 2017: Waste Management
https://www.readbyqxmd.com/read/28555399/assessing-demineralization-treatments-for-pvc-effluent-reuse-in-the-resin-polymerization-step
#19
Laura Blanco, Daphne Hermosilla, Carlos Negro, Nathalie Swinnen, David Prieto, Ángeles Blanco
To reduce fresh water consumption in a polyvinyl chloride (PVC) plant, the effluent from a biological treatment must be demineralized to be re-used in the resin polymerization process. Demineralization is a critical process, since the quality and the stability of the PVC resins are highly influenced by the water quality used in the process. The main target values for water parameters are the following: conductivity <10 μScm(-1), TOC < 10 mg L(-1), and Al < 0.1 mg L(-1). To achieve this quality, several reverse osmosis membranes from different materials and suppliers were tested and compared in the demineralization treatment...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28542320/the-ik1-kir2-1-channel-agonist-zacopride-prevents-and-cures-acute-ischemic-arrhythmias-in-the-rat
#20
Xu-Wen Zhai, Li Zhang, Yun-Fei Guo, Ying Yang, Dong-Ming Wang, Yan Zhang, Pan Li, Yi-Fan Niu, Qi-Long Feng, Bo-Wei Wu, Ji-Min Cao, Qing-Hua Liu
Arrhythmogenesis in acute myocardial infarction (MI) is associated with depolarization of resting membraine potential (RMP) and decrease of inward rectifier potassium current (IK1) in cardiomyocytes. However, clinical anti-arrhythmic agents that primarily act on RMP by enhancing the IK1 channel are not currently available. We hypothesized that zacopride, a selective and moderate agonist of the IK1/Kir2.1 channels, prevents and cures acute ischemic arrhythmias. To test this viewpoint, adult Sprague-Dawley (SD) rats were subjected to MI by ligating the left main coronary artery...
2017: PloS One
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