keyword
MENU ▼
Read by QxMD icon Read
search

ptfe

keyword
https://www.readbyqxmd.com/read/28633677/surveillance-of-endoscopes-comparison-of-different-sampling-techniques
#1
Lien Cattoir, Thomas Vanzieleghem, Lisa Florin, Tania Helleputte, Martine De Vos, Bruno Verhasselt, Jerina Boelens, Isabel Leroux-Roels
OBJECTIVE To compare different techniques of endoscope sampling to assess residual bacterial contamination. DESIGN Diagnostic study. SETTING The endoscopy unit of an 1,100-bed university hospital performing ~13,000 endoscopic procedures annually. METHODS In total, 4 sampling techniques, combining flushing fluid with or without a commercial endoscope brush, were compared in an endoscope model. Based on these results, sterile physiological saline flushing with or without PULL THRU brush was selected for evaluation on 40 flexible endoscopes by adenosine triphosphate (ATP) measurement and bacterial culture...
June 21, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28609786/gravimetric-measurements-of-filtering-facepiece-respirators-challenged-with-diesel-exhaust
#2
Swathi Satish, Jacob J Swanson, Kai Xiao, Andrew S Viner, David B Kittelson, David Y H Pui
Elevated concentrations of diesel exhaust have been linked to adverse health effects. Filtering facepiece respirators (FFRs) are widely used as a form of respiratory protection against diesel particulate matter (DPM) in occupational settings. Previous results (Penconek A, Drążyk P, Moskal A. (2013) Penetration of diesel exhaust particles through commercially available dust half masks. Ann Occup Hyg; 57: 360-73.) have suggested that common FFRs are less efficient than would be expected for this purpose based on their certification approvals...
June 13, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28601403/-activity-of-amphotericin-b-and-anidulafungin-alone-and-combined-against-candida-tropicalis-biofilms-developed-on-teflon-%C3%A2-and-titanium
#3
Marcelo Ernesto Fernández-Rivero, José L Del Pozo, Amparo Valentín, Victoria Fornes, Araceli Molina de Diego, Javier Pemán, Emilia Cantón
BACKGROUND: Current therapeutic strategies have a limited efficacy against Candida biofilms that form on the surfaces of biomedical devices. Few studies have evaluated the activity of antifungal agents against Candida tropicalis biofilms. OBJECTIVES: To evaluate the activity of amphotericin B (AMB) and anidulafungin (AND), alone and in combination, against C. tropicalis biofilms developed on polytetrafluoroethylene (teflon -PTFE) and titanium surfaces using time-kill assays...
June 14, 2017: Revista Iberoamericana de Micología
https://www.readbyqxmd.com/read/28597392/packaging-of-implantable-accelerometers-to-monitor-epicardial-and-endocardial-wall-motion
#4
Luigi Brancato, Tristan Weydts, Wouter Oosterlinck, Paul Herijgers, Robert Puers
Acceleration signals, collected from the inner and the outer heart wall, offer a mean of assessing cardiac function during surgery. Accelerometric measurements can also provide detailed insights into myocardial motion during exploratory investigations. Two different implantable accelerometers to respectively record endocardial and epicardial vibrations, have been developed by packaging a commercially available capacitive transducer. The same coating materials have been deposited on the two devices to ensure biocompatibility of the implants: Parylene-C, medical epoxy and Polydimethylsiloxane (PDMS)...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28551128/on-line-identification-of-chiral-ofloxacin-in-milk-with-an-extraction-ionization-device-coupled-to-electrospray-mass-spectrometry
#5
Jiang Wang, Xiao-Xiao Jiang, Wei Zhao, Jun Hu, Qi-Yuan Guan, Jing-Juan Xu, Hong-Yuan Chen
The direct separation and analysis of chiral drugs in the complex matrix systems are meaningful and challenging. As the most common broad-spectrum antibiotic, levofloxacin has a strong antibacterial ability, but its enantiomer, dextrofloxacin can cause serious harm to human health. In this work, we reported a rapid on-line extraction/ionization device coupled with Electrospray Mass Spectrometry (ESI-MS) for chiral analysis of ofloxacin enantiomers in complex matrix of milk. Since ofloxacin is difficult to dissolve in water and most organic solvents, the procedure of separating ofloxacin in complex system is often complicated...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28537269/in-situ-dynamic-tracking-of-heterogeneous-nanocatalytic-processes-by-shell-isolated-nanoparticle-enhanced-raman-spectroscopy
#6
Hua Zhang, Chen Wang, Han-Lei Sun, Gang Fu, Shu Chen, Yue-Jiao Zhang, Bing-Hui Chen, Jason R Anema, Zhi-Lin Yang, Jian-Feng Li, Zhong-Qun Tian
Surface molecular information acquired in situ from a catalytic process can greatly promote the rational design of highly efficient catalysts by revealing structure-activity relationships and reaction mechanisms. Raman spectroscopy can provide this rich structural information, but normal Raman is not sensitive enough to detect trace active species adsorbed on the surface of catalysts. Here we develop a general method for in situ monitoring of heterogeneous catalytic processes through shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) satellite nanocomposites (Au-core silica-shell nanocatalyst-satellite structures), which are stable and have extremely high surface Raman sensitivity...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28537051/artificial-ureter-in-patients-with-extensive-ureteral-damage
#7
Mohammad Yazdani, Amir Javid, Mehrdad Mohammadi Sichani, Mohammad Reza Gharaati, Emad Yazdani
PURPOSE: loss of significant lengths of ureter when substitution with bowel or bladder fails is a disaster in urology. This study is conducted to evaluate the results of subcutaneous nephron-vesical bypass (SNVB) in ureteral damage of different etiologies. MATERIALS AND METHODS: Seventeen SNVB were employed in patients with ureteral injuries. We employed a device consisted of an internal silicone tube covered by a coiled PTFE tube to replace the ureter. This is called artificial ureter (AU)...
May 23, 2017: Urology Journal
https://www.readbyqxmd.com/read/28535591/effect-of-water-stage-and-tree-stand-composition-on-spatiotemporal-differentiation-of-spring-water-chemistry-draining-carpathian-flysch-slopes-gorce-mts
#8
Michał Jasik, Stanisław Małek, Mirosław Żelazny
The purpose of this study was to identify the factors affecting spring water chemistry in different tree stands and to measure the influence of water stage on the physicochemical parameters of spring waters in a small Carpathian catchment. Water samples were collected three times per year at various stages of the water: after the spring thaw, after a period of heavy rain and after a dry period in 2011 and 2012. Water samples were left in the laboratory to reach room temperature (19-20°C) and analyzed for EC (reference T=25°C) and pH...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28534055/experimental-determination-of-surface-heat-transfer-coefficient-in-a-dry-ice-ethanol-cooling-bath-using-a-numerical-approach
#9
M V Santos, M Sansinena, N Zaritzky, J Chirife
BACKGROUND: Dry ice-ethanol bath (-78 degree C) have been widely used in low temperature biological research to attain rapid cooling of samples below freezing temperature. The prediction of cooling rates of biological samples immersed in dry ice-ethanol bath is of practical interest in cryopreservation. The cooling rate can be obtained using mathematical models representing the heat conduction equation in transient state. Additionally, at the solid cryogenic-fluid interface, the knowledge of the surface heat transfer coefficient (h) is necessary for the convective boundary condition in order to correctly establish the mathematical problem...
March 2017: Cryo Letters
https://www.readbyqxmd.com/read/28525273/directional-fluid-gating-by-janus-membranes-with-heterogeneous-wetting-properties-for-selective-oil-water-separation
#10
Prashant Gupta, Balasubramanian Kandasubramanian
The rising oil seepage accidents evolved into a global issue necessitating immediate counter measure to abridge its catastrophic repercussions on sensitive marine ecosystem urging innovative techniques for effective oil/water separation. Here, we report surface tailored wettability modified superhydrophobic/superoleophilic Janus membrane by impregnating nonionic surfactant stabilized nanosized polytetrafluoroethylene (PTFE) dispersion polymerized via nonfluorinated processing aid onto cotton substrate using the Meyer rod-coating technique, exhibiting excellent separation efficiency up to 98% with various petroleum products and retaining its intrinsic properties for at least 30 recurrences...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28523174/rupture-of-gore-tex-neochordae-10-years-after-mitral-valve-repair
#11
Makoto Mori, Philip Y K Pang, Sabet W Hashim
The current non-resectional paradigm in mitral valve (MV) repair emphasizes the use of polytetrafluoroethylene (PTFE) for artificial chordal replacement. While excellent long-term durability of repair using PTFE neochordae has been established, there have been rare reports of neochordal rupture at various times after surgery. We report a case of artificial chordal rupture 10 years after anterior mitral leaflet repair, necessitating reoperation. This complication may have been precipitated by maldistributed intracardiac tensile forces as a consequence of a malpositioned annuloplasty band...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28521218/the-effect-of-temperature-on-contact-angles-and-wetting-transitions-for-n-alkanes-on-ptfe
#12
M Elena Diaz, Michael D Savage, Ramon L Cerro
The aim of this paper is to present a method for predicting the effect of temperature on contact angles and wetting transitions for n-alkanes on PTFE. The analysis is based on the effect of temperature on two closely related phenomena, which are critical in the determination of contact angles: intermolecular forces and the thickness of an adsorbed film in the region adjacent to the three-phase contact. Considering solely van der Waals forces, it is possible to reproduce the experimental temperature dependence of contact angles...
October 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28515572/a-family-of-fe-n-c-oxygen-reduction-electrocatalysts-for-microbial-fuel-cell-mfc-application-relationships-between-surface-chemistry-and-performances
#13
Carlo Santoro, Alexey Serov, Rohan Gokhale, Santiago Rojas-Carbonell, Lydia Stariha, Jonathan Gordon, Kateryna Artyushkova, Plamen Atanassov
Different iron-based cathode catalysts have been studied for oxygen reduction reaction (ORR) in neutral media and then applied into microbial fuel cells (MFC). The catalysts have been synthesized using sacrificial support method (SSM) using eight different organic precursors named Niclosamide, Ricobendazole, Guanosine, Succinylsulfathiazole, Sulfacetamide, Quinine, Sulfadiazine and Pyrazinamide. Linear Sweep Voltammetry (LSV) curves were obtained for the catalysts using a O2 saturated in 0.1 M potassium phosphate buffer and 0...
May 15, 2017: Applied Catalysis. B, Environmental
https://www.readbyqxmd.com/read/28512687/added-value-of-covered-stents-in-transjugular-intrahepatic-portosystemic-shunt-a-large-single-center-experience
#14
Amar C Gupta, Weiping Wang, Chintan Shah, Mark J Sands, Jennifer Bullen, Erick M Remer, Pilar M Bayona, William Carey, Baljendra Kapoor
PURPOSE: Transjugular intrahepatic portosystemic shunts (TIPS) were historically placed using uncovered bare-metal stents. Current practice has now shifted toward the use of polytetrafluoroethylene (PTFE)-covered stents, given the improved primary patency seen with these stents. The aim of this study was to determine whether there is any added value, such as overall survival or stent patency, when using covered stents versus uncovered stents in TIPS placement in a large cohort. MATERIALS AND METHODS: From April 1995 to June 2012, a total of 744 consecutive adult patients underwent de novo TIPS placement (378 receiving uncovered stents, 366 receiving covered stents)...
May 16, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28512304/nearly-perfect-durable-superhydrophobic-surfaces-fabricated-by-a-simple-one-step-plasma-treatment
#15
Jeongeun Ryu, Kiwoong Kim, JooYoung Park, Bae Geun Hwang, YoungChul Ko, HyunJoo Kim, JeongSu Han, EungRyeol Seo, YongJong Park, Sang Joon Lee
Fabrication of superhydrophobic surfaces is an area of great interest because it can be applicable to various engineering fields. A simple, safe and inexpensive fabrication process is required to fabricate applicable superhydrophobic surfaces. In this study, we developed a facile fabrication method of nearly perfect superhydrophobic surfaces through plasma treatment with argon and oxygen gases. A polytetrafluoroethylene (PTFE) sheet was selected as a substrate material. We optimized the fabrication parameters to produce superhydrophobic surfaces of superior performance using the Taguchi method...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28506101/evaluation-of-personal-inhalable-aerosol-samplers-with-different-filters-for-use-during-anthrax-responses
#16
Sergey A Grinshpun, Angela M Weber, Michael Yermakov, Reshmi Indugula, Yousef Elmashae, Tiina Reponen, Laura Rose
Risk of inhalation exposure to viable Bacillus anthracis (B. anthracis) spores has primarily been assessed using short-term, stationary sampling methods which may not accurately characterize the concentration of inhalable-sized spores reaching a person's breathing zone. While a variety of aerosol sampling methods have been utilized during previous anthrax responses, no consensus has yet been established for personal air sampling. The goal of this study was to determine the best sampler-filter combination(s) for the collection and extraction of B...
May 16, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28503009/performance-of-metal-and-polymeric-o-ring-seals-during-beyond-design-basis-thermal-conditions
#17
Jiann C Yang, Edward Hnetkovsky, Doris Rinehart, Marco Fernandez, Felix Gonzalez, Joseph Borowsky
This paper summarizes the small scale thermal exposure test results of the performance of metallic and polymeric O-ring seals typically used in radioactive material transportation packages. Five different O-ring materials were evaluated: Inconel/silver, ethylene-propylene diene monomer (EPDM), polytetrafluoroethylene (PTFE), silicone, butyl, and Viton. The overall objective of this study is to provide test data and insights to the performance of these Oring seals when exposed to beyond-design-basis temperature conditions due to a severe fire...
April 2017: Polymer Testing
https://www.readbyqxmd.com/read/28502428/non-proximate-mass-spectrometry-using-a-heated-1-m-long-ptfe-tube-and-an-air-tight-apci-ion-source
#18
Dilshadbek T Usmanov, Kenzo Hiraoka, Hiroshi Wada, Masaya Matsumura, Sachiyo Sanada-Morimura, Hiroshi Nonami, Shinichi Yamabe
Direct and rapid trace-level gas analysis is highly needed in various fields such as safety and security, quality control, food analysis, and forensic medicine. In many cases, the real samples are bulky and are not accessible to the space-limited ion source of the mass spectrometer. In order to circumvent this problem, we developed an airtight atmospheric-pressure chemical ionization (APCI) ion source equipped with a flexible 1-m-long, 2-mm-i.d. PTFE sniffing tube. The ambient air bearing sample gas was sucked into the heated PTFE tube (130 °C) and was transported to the air-tight ion source without using any extra pumping system or a Venturi device...
June 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28487112/outcomes-of-self-expanding-ptfe-covered-stent-versus-bare-metal-stent-for-chronic-iliac-artery-occlusion-in-matched-cohorts-using-propensity-score-modelling
#19
M Piazza, F Squizzato, A Dall'Antonia, S Lepidi, M Menegolo, F Grego, M Antonello
OBJECTIVES: The aim was to compare outcomes of self expanding PTFE covered stents (CSs) with bare metal stents (BMSs) in the treatment of iliac artery occlusions (IAOs). METHODS: Between January 2009 and December 2015, 128 iliac arteries were stented for IAO. A CS was implanted in 78 iliac arteries (61%) and a BMS in 50 (49%). After propensity score matching, 94 limbs were selected and underwent stenting (47 for each group). Thirty day outcomes and midterm patency were compared; follow-up results were analysed with Kaplan-Meier curves...
May 6, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28479468/a-ten-year-experience-using-a-hybrid-endovascular-approach-to-treat-aberrant-subclavian-arterial-aneurysms
#20
Mathew Wooster, Martin Back, Danielle Sutzko, Hollie Gaeto, Paul Armstrong, Murray Shames
BACKGROUND: To describe a single center experience using combined extra-anatomic open arch branch revascularization with aortic arch endovascular exclusion for treatment of aberrant subclavian artery aneurysms. METHODS: All patients undergoing management of aberrant subclavian aneurysms were identified from a prospective patient registry. Means of revascularization included carotid-subclavian bypass or subclavian transposition and origin occlusion was performed by surgical ligation or endovascular embolization at surgeon discretion...
May 4, 2017: Annals of Vascular Surgery
keyword
keyword
88013
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"