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https://www.readbyqxmd.com/read/28927165/air-and-surface-sampling-method-for-assessing-exposures-to-quaternary-ammonium-compounds-using-liquid-chromatography-tandem-mass-spectrometry
#1
Ryan F LeBouf, Mohammed Abbas Virji, Anand Ranpara, Aleksandr B Stefaniak
This method was designed for sampling select quaternary ammonium (quat) compounds in air or on surfaces followed by analysis using ultraperformance liquid chromatography tandem mass spectrometry. Target quats were benzethonium chloride, didecyldimethylammonium bromide, benzyldimethyldodecylammonium chloride, benzyldimethyltetradecylammonium chloride, and benzyldimethylhexadecylammonium chloride. For air sampling, polytetrafluoroethylene (PTFE) filters are recommended for 15-min to 24-hour sampling. For surface sampling, Pro-wipe® 880 (PW) media was chosen...
July 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28924998/pulmonary-vein-stenosis-with-collateralization-via-esophageal-varices-long-term-follow-up-after-successful-treatment-with-drug-eluting-stent
#2
Jason F Goldberg, Craig L Jensen, Rajesh Krishnamurthy, Nidhy P Varghese, Henri Justino
OBJECTIVE: We describe the long-term follow-up of a child with recurrent hemoptysis due to severe pulmonary vein stenosis decompressing via collaterals to esophageal varices. DESIGN: Case report SETTING: Tertiary children's hospital PATIENT: Single child through ages 2- to 11-year old INTERVENTIONS: The child underwent cutting balloon angioplasty, bare metal stenting, and implantation of a PTFE-covered stent, all of which failed rapidly. Only after placement of a paclitaxel drug eluting stent did he have prolonged relief from hemoptysis and long-term patency of the treated vein...
September 18, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28921812/evaluation-of-air-samplers-and-filter-materials-for-collection-and-recovery-of-airborne-norovirus
#3
Katrine Uhrbrand, Ismo K Koponen, Anna Charlotte Schultz, Anne Mette Madsen
AIMS: The aim of this study was to identify the most efficient sampling method for quantitative PCR-based detection of airborne human norovirus (NoV). METHODS AND RESULTS: A comparative experiment was conducted in an aerosol chamber using aerosolised murine norovirus (MNV) as a surrogate for NoV. Sampling was performed using a nylon (NY) filter in conjunction with four kinds of personal samplers; Gesamtstaubprobenahme sampler (GSP), Triplex-cyclone sampler (TC), 3-piece closed-faced Millipore cassette (3P) and a 2-stage NIOSH cyclone sampler (NIO)...
September 18, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28920636/politetrafluorene-suture-used-as-artificial-mitral-chord-mechanical-properties-and-surgical-implications
#4
Philippe P Caimmi, Maurizio Sabbatini, Luca Fusaro, Mario Cannas
BACKGROUND: Novel surgical approach to repair degenerative mitral regurgitation such as transapical chordae tendineae replacement and "loop in loop" in loop techniques, need of artificial chordae longer than that used in the older techniques of chordae tendineae replacement. This difference in length has been reported as potential critical point for durability of artificial chordae. In the present paper we have investigated the elastic behavior of different diameter and length politetrafluorene (PTFE) suture threads as substitute of native chordae, to identify their reliability to use as long artificial chordae...
December 2017: Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/28917788/glass-polytetrafluoroethylene-glass-based-sandwich-microdevice-for-continuous-flow-polymerase-chain-reaction-and-its-application-for-fast-identification-of-foodborne-pathogens
#5
Kieu The Loan Trinh, Nae Yoon Lee
A uniquely fabricated microdevice with a glass-polytetrafluoroethylene (PTFE)-glass (GPG) sandwich configuration was developed for the fast identification of foodborne pathogens by using continuous-flow polymerase chain reaction (PCR) followed by on-site fluorescence detection of PCR products. A PTFE tube was simply folded into a serpentine configuration and sandwiched between two glass slides to maintain a 2D planar structure. By using a PTFE tube, the microchannel has the advantage of seamlessness without the need for photolithography methods, and is less expensive and less time-consuming to fabricate than alternative devices...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28913736/ptfe-coated-non-stick-cookware-and-toxicity-concerns-a-perspective
#6
Muhammad Sajid, Muhammad Ilyas
PTFE is used as an inner coating material in non-stick cookware. This unique polymer coating prevents food from sticking in the pans during the cooking process. Such cookware is also easy to wash. At normal cooking temperatures, PTFE-coated cookware releases various gases and chemicals that present mild to severe toxicity. Only few studies describe the toxicity of PTFE but without solid conclusions. The toxicity and fate of ingested PTFE coatings are also not understood. Moreover, the emerging, persistent, and well-known toxic environmental pollutant PFOA is also used in the synthesis of PTFA...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28893465/recurrent-benign-urethral-strictures-treated-with-covered-retrievable-self-expandable-metallic-stents-long-term-outcomes-over-an-18-year-period
#7
Min Tae Kim, Kun Yung Kim, Ho-Young Song, Jung-Hoon Park, Jiaywei Tsauo, Zhe Wang, Pyeong Hwa Kim
PURPOSE: To assess the long-term outcomes of covered retrievable self-expandable metallic stent (REMS) placement for recurrent benign urethral stricture and to compare the outcomes associated with 3 types of covered REMSs. MATERIALS AND METHODS: A retrospective study was performed in 54 male patients in whom 114 REMSs were placed between November 1998 and December 2016. These included 26 polyurethane-covered REMSs in 13 patients (group A), 47 internally polytetrafluoroethylene (PTFE)-covered REMSs in 21 patients (group B), and 41 externally PTFE-covered REMSs in 20 patients (group C)...
September 8, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28887261/stenting-of-subclavian-artery-true-and-false-aneurysms-a-systematic-review
#8
REVIEW
Anastasios Maskanakis, Nikolaos Patelis, Demetrios Moris, Diamantis I Tsilimigras, Dimitrios Schizas, Maria Diakomi, Chris Bakoyiannis, Sotirios Georgopoulos, Chris Klonaris, Theodoros Liakakos
BACKGROUND: Aneurysms of the subclavian artery are usually the result of trauma, atherosclerosis or thoracic outlet syndrome. Until the 90s, open surgical repair was considered the only therapeutic choice, exhibiting high complication rates. Since the first report of endovascular repair of subclavian aneurysms in 1991, promising results have been published. OBJECTIVES: To summarize all available data on SA true and false aneurysm stenting in order to reach conclusions regarding morbidity, mortality and other procedure-related characteristics...
September 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28883662/analyzing-the-molecular-kinetics-of-water-spreading-on-hydrophobic-surfaces-via-molecular-dynamics-simulation
#9
Lei Zhao, Jiangtao Cheng
In this paper, we report molecular kinetic analyses of water spreading on hydrophobic surfaces via molecular dynamics simulation. The hydrophobic surfaces are composed of amorphous polytetrafluoroethylene (PTFE) with a static contact angle of ~112.4° for water. On the basis of the molecular kinetic theory (MKT), the influences of both viscous damping and solid-liquid retarding were analyzed in evaluating contact line friction, which characterizes the frictional force on the contact line. The unit displacement length on PTFE was estimated to be ~0...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28869158/re-bleeding-rates-and-survival-after-early-transjugular-intrahepatic-portosystemic-shunt-tips-in-clinical-practice
#10
Theresa Bucsics, Maria Schoder, Nicolas Goeschl, Philipp Schwabl, Mattias Mandorfer, Magdalena Diermayr, Maria Feldner, Florian Riedl, David Bauer, Bernhard Angermayr, Manfred Cejna, Arnulf Ferlitsch, Wolfgang Sieghart, Michael Trauner, Markus Peck-Radosavljevic, Josef Karner, Franz Karnel, Thomas Reiberger
BACKGROUND: Early implantation (<72h) of a transjugular intrahepatic portosystemic shunt (TIPS) after acute variceal bleeding (AVB) improves survival in highly selected patients. METHODS: We retrospectively assessed bleeding control and survival of unselected cirrhotic patients undergoing early TIPS implantation within 72h. We compared the outcomes to patients meeting early TIPS criteria but receiving late TIPS within 3-28days after AVB and endoscopic/medical treatment...
August 8, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/28865977/safety-and-efficacy-of-polyurethane-vascular-grafts-for-early-hemodialysis-access
#11
John D Kakisis, Constantine Antonopoulos, George Mantas, Evaggelos Alexiou, Konstantina Katseni, George Sfyroeras, Konstantinos Moulakakis, George Geroulakos
BACKGROUND: Arteriovenous grafts made of polyurethane (PU) have the advantage of early cannulation obviating the placement of a central vein catheter in patients with an acute need for long-term hemodialysis. The aim of the present study was to evaluate the safety, efficacy and complication rate of PU vascular grafts for dialysis access in patients in whom early cannulation was performed. METHODS: Between January 2007 and December 2015, 125 straight brachial-axillary grafts were placed in patients with an acute thrombosis of a previous arteriovenous access...
August 30, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28861425/single-incision-video-assisted-thoracoscopic-evaluation-and-emergent-surgery-for-severe-lung-and-chest-wall-injury-after-thoracic-trauma-in-a-water-park
#12
Julio Sesma, Melodie Alvarez, Francisco Lirio, Carlos Galvez, Maria Galiana, Benno Baschwitz, Francisca Fornes, Sergio Bolufer
Thoracic trauma is a challenging situation with potential severe chest wall and intrathoracic organ injuries. We present a case of emergent surgery in a 23-year-old man with hemorrhagic shock due to massive lung and chest wall injury after thoracic trauma in a water slide. We performed a SI-VATS approach in order to define intrathoracic and chest wall injuries, and once checked the extension of the chest wall injury, we added a middle size thoracotomy just over the affected area in order to stabilize rib fractures with Judet plates, that had caused massive laceration in left lower lobe (LLL) and injured the pericardium causing myocardical tear...
August 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28859519/intraoperative-measurement-of-pressure-gradient-in-median-arcuate-ligament-syndrome-as-a-rationale-for-radical-surgical-approach
#13
Tomas Grus, Lukas Lambert, Tomas Vidim, Gabriela Grusova, Tomas Klika
BACKGROUND: Median arcuate ligament syndrome (MALS) describes clinical symptoms in patients with stenosis of the celiac artery due to external compression by the ligament. There is an ongoing debate, whether sole release of the median arcuate ligament warrants long-term relief of the symptoms. MATERIALS AND METHODS: Eight patients diagnosed with MALS underwent open surgical treatment beginning with the release of the ligament. Systemic pressure and pressure in the left gastric artery were measured before and after division of the median arcuate ligament and release of the celiac artery...
August 31, 2017: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/28857292/ion-suppression-effect-in-desi-mass-spectrometry-and-esi-mass-spectrometry
#14
Zheng Wang, Haijing Zhu, Guangming Huang
RATIONALE: Although desorption electrospray ionization (DESI) is claimed to have less ion suppression effect than electrospray ionization (ESI), related investigation with quantification measurement of ion suppression effect is absent. Herein, comparative analysis of ion suppression effect between DESI and ESI was conducted, aiming to quantitatively study the ion suppression effect. METHODS: CTVA mixtures, constant concentration of tioconazole with varied concentrations of atenolol, were detected for ESI and DESI...
August 31, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28854491/in-vitro-evaluation-of-collagen-immobilization-on-polytetrafluoroethylene-through-nh3-plasma-treatment-to-enhance-endothelial-cell-adhesion-and-growth
#15
Mahboobeh Mahmoodi, Mohammad Zamanifard, Mina Safarzadeh, Shahin Bonakdar
BACKGROUND: Polytetrafluoroethylene (PTFE) is poorly biocompatible due to its low surface energy and hydrophobicity, which cause weak cell attachment and proliferation and complicate its use in implants. OBJECTIVE: NH3 plasma was used for surface modification and binding of amine groups on the PTFE surface. Collagen was immobilized on the plasma-treated PTFE in order to enable it to support enhanced cell adhesion and growth. METHODS: PTFE was exposed to NH3 plasma and collagen was immobilized on the NH3 plasma-treated surface...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28842701/drastic-improvement-in-adhesion-property-of-polytetrafluoroethylene-ptfe-via-heat-assisted-plasma-treatment-using-a-heater
#16
Yuji Ohkubo, Kento Ishihara, Masafumi Shibahara, Asahiro Nagatani, Koji Honda, Katsuyoshi Endo, Kazuya Yamamura
The heating effect on the adhesion property of plasma-treated polytetrafluoroethylene (PTFE) was examined. For this purpose, a PTFE sheet was plasma-treated at atmospheric pressure while heating using a halogen heater. When plasma-treated at 8.3 W/cm(2) without using the heater (Low-P), the surface temperature of Low-P was about 95 °C. In contrast, when plasma-treated at 8.3 W/cm(2) while using the heater (Low-P+Heater), the surface temperature of Low-P+Heater was controlled to about 260 °C. Thermal compression of the plasma-treated PTFE with or without heating and isobutylene-isoprene rubber (IIR) was performed, and the adhesion strength of the IIR/PTFE assembly was measured via the T-peel test...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28841004/nanoporous-ptfe-nanoparticles-supported-on-n-doped-porous-carbon-sheets-derived-from-metal-organic-frameworks-as-highly-efficient-and-durable-oxygen-reduction-reaction-catalysts
#17
Kang Yang, Peng Jiang, Jitang Chen, Qianwang Chen
Designing and exploring catalysts with high activity and stability for oxygen reduction reaction (ORR) at the cathode in acidic environments is imperative for the industrialization of proton exchange membrane fuel cells (PEMFCs). Theoretical calculations and experiments have demonstrated that alloying Pt with a transition metal can not only cut down the usage of scarce Pt metal but also improve performance of mass activity compared with pure Pt. Herein, we exhibit the preparation of nanoporous PtFe nanoparticles (np-PtFe NPs) supported on N-doped porous carbon sheets (NPCS) via facile in situ thermolysis of a Pt-modified Fe-based metal-organic framework (MOF)...
September 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28836427/embedded-triboelectric-active-sensors-for-real-time-pneumatic-monitoring
#18
Xianpeng Fu, Tianzhao Bu, Fengben Xi, Tinghai Cheng, Chi Zhang, Zhong Lin Wang
Pneumatic monitoring sensors have great demands for power supply in cylinder systems. Here we present an embedded sliding triboelectric nanogenerator (TENG) in air cylinder as active sensors for position and velocity monitoring. The embedded TENG is composed of a circular PTFE polymer and the triangular copper electrode. The working mechanism as triboelectric active sensors and electric output performance are systematically investigated. By integrating into the pneumatic system, the embedded triboelectric active sensors have been used for real-time air pressure/flow monitoring and energy storage...
August 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28822048/evaluation-of-methods-to-determine-adsorption-of-polycyclic-aromatic-hydrocarbons-to-dispersed-carbon-nanotubes
#19
Berit Glomstad, Lisbet Sørensen, Jingfu Liu, Mohai Shen, Florian Zindler, Bjørn M Jenssen, Andy M Booth
A number of methods have been reported for determining hydrophobic organic compound adsorption to dispersed carbon nanotubes (CNTs), but their accuracy and reliability remain uncertain. We have evaluated three methods to investigate the adsorption of phenanthrene (a model polycyclic aromatic hydrocarbon, PAH) to CNTs with different physicochemical properties: dialysis tube (DT) protected negligible depletion solid phase microextraction (DT-nd-SPME), ultracentrifugation, and filtration using various types of filters...
August 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28820359/clinical-outcomes-of-direct-oral-anticoagulants-after-lower-extremity-arterial-procedures
#20
Afsha Aurshina, Pavel Kibrik, Justin Eisenberg, Ahmad Alsheekh, Anil Hingorani, Natalie Marks, Enrico Ascher
Objectives The use of postoperative anticoagulation is not uncommon for patients undergoing lower extremity arterial procedures as adjunctive therapy. Longer postoperative length of stay is necessary to achieve adequate therapeutic international normalized ratio with traditional protocols that call for the use of unfractionated heparin and warfarin therapy. We hypothesized the direct oral anticoagulants are an attractive alternative to provide adequate anticoagulation in patients who undergo lower extremity arterial procedures...
January 1, 2017: Vascular
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