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Huijia Yang, Minghua Zhou, Weilu Yang, Gengbo Ren, Liang Ma
H2 O2 production plays an important role in electro-Fenton process for pharmaceutical and personal care products (PPCPs) degradation. In this work, carbon nanotube (CNT) was attempted to make a gas diffusion electrode (GDE) by rolling method to achieve a high H2 O2 production and current efficiency, and it was further used as electro-Fenton cathode for the degradation of acetylsalicylic acid (ASA) as one kind of PPCPs. The optimal amount of catalyst layer was 0.15 g CNT and 93.75 μL PTFE, obtaining the production of H2 O2 of 805 mg L-1 in 0...
May 4, 2018: Chemosphere
Amir Hossein Alinoori, Saeed Masoum
A unique metal oxide semiconductor sensor (MOS) array detector with eight sensors was designed and fabricated in a PTFE chamber as an interface for coupling with multicapillary gas chromatography. This design consists of eight transfer lines with equal length between the multicapillary columns (MCC) and sensors. The deactivated capillary columns were passed through each transfer line and homemade flow splitter to distribute the same gas flow on each sensor. Using eight ports flow splitter design helps us to equal the length of carrier gas path and flow for each sensor, minimizing the dead volume of the sensor's chamber and increasing chromatographic resolution...
May 14, 2018: Analytical Chemistry
Xavier Alexis Walter, John Greenman, Ioannis Ieropoulos
The recently developed self-stratifying membraneless microbial fuel cell (SSM-MFC) has been shown as a promising concept for urine treatment. The first prototypes employed cathodes made of activated carbon (AC) and polytetrafluoroethylene (PTFE) mixture. Here, we explored the possibility to substitute PTFE with either polyvinyl-alcohol (PVA) or PlastiDip (CPD; i.e. synthetic rubber) as binder for AC-based cathode in SSM-MFC. Sintered activated carbon (SAC) was also tested due to its ease of manufacturing and the fact that no stainless steel collector is needed...
April 19, 2018: Bioelectrochemistry
Siti Noor Idora Syafinaz Zulkepli, Nor Hisham Hamid, Vineeta Shukla
In recent years, the number of interdisciplinary research works related to the development of miniaturized systems with integrated chemical and biological analyses is increasing. Digital microfluidic biochips (DMFBs) are one kind of miniaturized systems designed for conducting inexpensive, fast, convenient and reliable biochemical assay procedures focusing on basic scientific research and medical diagnostics. The role of a dielectric layer in the digital microfluidic biochips is prominent as it helps in actuating microliter droplets based on the electrowetting-on-dielectric (EWOD) technique...
May 8, 2018: Biosensors
K Memon, Y Cheng, F Panhwar, Z R Chen, Z Haider, S Afridi, P Hu, G Zhao
  BACKGROUND: Osmotic shock upon the addition and removal of cryoprotectant agent (CPA) is a major source of cell damage during cryopreservation. OBJECTIVE: Microfluidic device offers a new platform for CPA loading and unloading. The micro scale dimension makes possible to perform a detailed analysis and controllable removal of CPA with many advantages. MATERIALS AND METHODS: A microfluidic device was developed for extracting dimethyl sulfoxide (DMSO) from the sample streamline...
January 2018: Cryo Letters
Johannes Nordmeyer, Peter Kramer, Felix Berger, Stephan Schubert
Treatment of aneurysmal lesions in the context of coarctation of the aorta (CoA) is a challenging task and these lesions are rare in children. An 11-year-old boy was incidentally diagnosed with native CoA and concomitant complex aneurysmal lesions during medical check-up for arterial hypertension. Pre-catheterization imaging was performed with computed tomography (CT), which showed a mild CoA and two native aneurysms that were juxtaposed to the origin of the left subclavian artery. For planning and guidance of the catheter procedure, image fusion software was used with an overlay from pre-registered three-dimensional reconstruction images on live fluoroscopy...
May 4, 2018: Catheterization and Cardiovascular Interventions
R Kurnaz, M Ikizler, M Ozbayburtlu, T Gunes
Proximal humerus fracture is a common arm trauma and rarely occurs with vascular injury which however is a serious complication. In this case report, we present a long segment dissection of the axillary and brachial arteries as a rare complication due to fragmented proximal humerus fracture and shoulder dislocation. An 80-year old female patient was seen at the emergency department. Radiograph examination has revealed a fragmented proximal humerus fracture besides dislocation of the head of humerus towards the axillary area...
March 2018: Malaysian Orthopaedic Journal
Wenlu Zhang, Fengyi Chen, Wenwen Ma, Qiangzhou Rong, Xueguang Qiao, Ruohui Wang
A fringe visibility enhanced fiber-optic Fabry-Perot interferometer based ultrasonic sensor is proposed and experimentally demonstrated for seismic physical model imaging. The sensor consists of a graded index multimode fiber collimator and a PTFE (polytetrafluoroethylene) diaphragm to form a Fabry-Perot interferometer. Owing to the increase of the sensor's spectral sideband slope and the smaller Young's modulus of the PTFE diaphragm, a high response to both continuous and pulsed ultrasound with a high SNR of 42...
April 16, 2018: Optics Express
Saqib A Gowani, Brett Hiendlmayr, Amged Abdelaziz, Robert Gallagher, Immad Sadiq, Jeffrey Hirst
A 60-year-old male presented 12 months after CABG surgery with a large pulsatile sternal mass. CT scan of the chest demonstrated a pseudoaneurysm originating from the mid saphenous vein graft to the PDA measuring 7.7 x 7.2 x 6.0 cm. After a multidisciplinary consultation, a decision was made to place a Jostent GraftMaster to completely seal the communication of the extravasation.
May 2018: Journal of Invasive Cardiology
Khashayar Kordbacheh Changi, Gary Greenstein
In type II sockets, the soft-tissue level is at or coronal to the cementoenamel junction, and part of the buccal plate is missing. In the esthetic zone, a patient with this type of situation often is not a good candidate for immediate implant placement until the osseous defect is repaired. Therefore, use of a conservative regenerative procedure to repair such a defective socket would be advantageous. The Cytocone procedure utilizes a nonresorbable dense polytetrafluorethylene (d-PTFE) barrier and modifies the classic "ice cream cone" technique to restore a buccal osseous defect without raising a labial flap...
May 2018: Compendium of Continuing Education in Dentistry
M I Ramírez-Romero, L García-Salinas, M Villicaña-Méndez, R Huirache-Acuña, J Apolinar-Cortés, P R González
This work presents the results obtained from the dosimetric properties of the new radiation detectors of KMgF3 :Tb + PTFE. The thermoluminescent material was obtained by microwave technique. The polycrystalline powder obtained was mixed with polytetrafluoroethylene resin powder in the ratio 2:3 to make dosimeters in pellet form. The thermoluminescent response of these new detectors presented a linear behavior, in the dose range between 1 and 1000 Gy 60 Co gamma radiation, the repeatability test in the measurements, during ten cycles of heat treatment, irradiation and readouts, showed ± 3...
April 6, 2018: Applied Radiation and Isotopes
Michael J Ramdass, Alyssa Muddeen, Patrick Harnarayan, Richard Spence, David Milne
Popliteal artery trauma is uncommon but is associated with a high risk of limb loss depending on the scenario involving blunt or penetrating trauma as well as the severity and extent of injury that has occurred. In our setting there is a significant amount of gang and civilian warfare resulting in Vascular Trauma. There were 32 patients over a decade who sustained traumatic injury to the popliteal artery consisting of 30 males (94%) and 2 females with an age range 16-59 years with a mean of 32. There were 20 cases of penetrating trauma (63%) and 12 cases of blunt trauma (37%)...
April 24, 2018: Injury
Qian Zhang, Lei Li, Yanxiang Li, Lixia Cao, Chuanfang Yang
Four fluorocarbon polymers including PTFE and PVDF were coated respectively on a stainless steel felt to separate emulsified water droplets from ultralow sulfur diesel fuels (ULSD). The original fuel treated with clay to remove additives was additized again with four known surfactants including Pentaerythrityoleate, (octadecadienoic acid) dipolymer, (octadecadienoic acid) tripolymer and monoolein individually. The different surfactants adsorbed on the fuel-water interface reduce the interfacial intension with different intensity...
April 27, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Mafalda Correia, André Marinho, Carolina Mendes, Luís Antunes, Óscar Gonçalves
INTRODUCTION: True brachial artery aneurysms are rare and some of them have been described as a late complication in patients with vascular access for haemodialysis and kidney graft. The purpose of this paper is to present a clinical case of a patient with a true brachial artery aneurysm and its following treatment. METHODS: This case concerns a caucasian male patient with 43 years old who had vesicoureteral reflux at 7 years old, and subsequent end-stage renal disease, and started on haemodialysis at the age of twelve...
July 2017: Revista Portuguesa de Cirurgia Cardio-torácica e Vascular
Tiago Soares, João Rocha Neves, Ricardo Castro Ferreira, Pedro Almeida, Paulo Dias, Sérgio Sampaio, José Fernando Teixeira
INTRODUCTION: The aim of this study is to evaluate the outcome of catheter directed thrombolysis (CDT) in acute lower limb ischaemia depending on the underlying etiology. METHODS: Retrospective single center analysis of electronic clinical data on patients with acute lower limb ischaemia treated with CDT. Between January 2011 and September 2017, 128 procedures in 106 patients were included. The etiology of ischaemia was native artery thrombosis in 39 procedures (30,5%), PTFE graft thrombosis in 56 (43,8%), intra-stent thrombosis in 11 (8,6%), emboly in 9 (7%), popliteal aneurysm thrombosis in 9 (7%), vein graft thrombosis in 2 (1,6%) and popliteal artery entrapment in 2 (1,6%)...
July 2017: Revista Portuguesa de Cirurgia Cardio-torácica e Vascular
Diego R V Guelfi, Fábio Gozzi, Ignasi Sirés, Enric Brillas, Amílcar Machulek, Silvio César de Oliveira
Solutions with 0.65 mM of the antituberculosis drug isoniazid (INH) in 0.050 M Na2 SO4 at pH 3.0 were treated by electro-Fenton (EF) and UVA photoelectro-Fenton (PEF) processes using a cell with a BDD anode and a carbon-PTFE air-diffusion cathode. The influence of current density on degradation, mineralization rate, and current efficiency has been thoroughly evaluated in EF. The effect of the metallic catalyst (Fe2+ or Fe3+ ) and the formation of products like short-chain linear aliphatic carboxylic acids were assessed in PEF...
April 27, 2018: Environmental Science and Pollution Research International
Benjamin Moulin, Olivier Chevallier, Gilles Abdulmalak, Maxime Luu, Marianne Latournerie, Anne Minello, Sophie Gehin, Jean-Pierre Cercueil, Marco Midulla, Romaric Loffroy
Background: To assess the association between final polytetrafluoroethylene (PTFE)-covered stent transjugular intrahepatic portosystemic shunt (TIPS) angiographic parameters and free shunt revision survey. Methods: Series of two comparison groups were generated with persistence of varices or not, the 25th , 50th , and 75th percentile as cutoff for each angle and a 15-mm distance as cutoff for distance D. Kaplan Meier free shunt revision curves were then created and compared with Log Rank test...
March 2018: Quantitative Imaging in Medicine and Surgery
Michael Wleklinski, Bradley P Loren, Christina R Ferreira, Zinia Jaman, Larisa Avramova, Tiago J P Sobreira, David H Thompson, R Graham Cooks
We report the high throughput analysis of reaction mixture arrays using methods and data handling routines that were originally developed for biological tissue imaging. Desorption electrospray ionization (DESI) mass spectrometry (MS) is applied in a continuous on-line process at rates that approach 104 reactions per h at area densities of up to 1 spot per mm2 (6144 spots per standard microtiter plate) with the sprayer moving at ca. 104 microns per s. Data are analyzed automatically by MS using in-house software to create ion images of selected reagents and products as intensity plots in standard array format...
February 14, 2018: Chemical Science
Ravil Sharifulin, Alexander Bogachev-Prokophiev, Igor Demin, Sergey Zheleznev, Alexey Pivkin, Alexander Afanasyev, Alexander Karaskov
OBJECTIVES: The type of conduit used for right ventricular outflow tract (RVOT) reconstruction during the Ross procedure remains problematic because of the limited availability of pulmonary allografts and the unsatisfactory long-term results associated with the use of xenografts. Polytetrafluoroethylene (PTFE) conduits have been proposed as an alternative. This study evaluated the results of RVOT reconstruction using a PTFE conduit during the Ross procedure. METHODS: Between 2007 and 2015, 28 patients underwent RVOT reconstruction using PTFE conduits...
April 5, 2018: European Journal of Cardio-thoracic Surgery
Seth N Lyman, Marc L Mansfield
Solid or sludgy hydrocarbon waste is a byproduct of oil and gas exploration and production. One commonly-used method of disposing of this waste is landfarming. Landfarming involves spreading hydrocarbon waste on soils, tilling it into the soil, and allowing it to biodegrade. We used a dynamic flux chamber to measure fluxes of methane, a suite of 54 non-methane hydrocarbons, and light alcohols from an active and a remediated landfarm in eastern Utah, U.S.A. Fluxes from the remediated landfarm were not different from a PTFE sheet or from undisturbed soils in the region...
April 13, 2018: Journal of the Air & Waste Management Association
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