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Andrea Buffa, Yigal Erel, Daniel Mandler
A flow-through electrode made of a carbon nanotubes (CNT) film deposited on a polytetrafluoroethylene (PTFE) membrane was assembled and employed for the determination of low concentration of copper as a model system by linear sweep anodic stripping voltammetry (LSASV). CNT films with areal mass ranging from 0.12 to 0.72 mg cm-2 were characterized by measurement of sheet resistance, water permeation flux and capacitance. Moreover, CNT with two different sizes and PTFE membrane with two different pore diameters (0...
October 17, 2016: Analytical Chemistry
Filippo Benedetto, Domenico Spinelli, Narayana Pipitò, Giambattista Gagliardo, Alberto Noto, Simona Villari, Antonio David, Francesco Spinelli
OBJECTIVE: The purpose of this study was to examine the outcomes of a vascular hybrid polytetrafluoroethylene (PTFE) graft, provided with a nitinol-reinforced section (NRS) on one end, in hemodialysis vascular access placement. METHODS: A retrospective study was conducted including all the consecutive patients who underwent Gore Hybrid Vascular Graft (GHVG; W. L. Gore & Associates, Flagstaff, Ariz) implantation for hemodialysis access placement between October 2013 and November 2015...
October 12, 2016: Journal of Vascular Surgery
Domenico Laurito, Riccardo Cugnetto, Marco Lollobrigida, Fabrizio Guerra, Annarita Vestri, Francesca Gianno, Sandro Bosco, Luca Lamazza, Alberto De Biase
This study aimed to evaluate the efficacy of an exposed high-density polytetrafluoroethylene (d-PTFE) membrane in preventing epithelial migration in postextraction sockets. For this purpose, a histologic description of the newly formed soft tissue underlying the membrane is presented. The periodontal status of the adjacent teeth was also evaluated to assess the gingival response. Ten premolar extraction sockets were treated. After tooth extraction, the sockets were filled with nanocrystalline hydroxyapatite and covered with d-PTFE membranes...
November 2016: International Journal of Periodontics & Restorative Dentistry
Pierpaolo Cortellini, Jacopo Buti, Giovanpaolo Pini Prato, Maurizio S Tonetti
AIM: compare the long-term outcomes and costs of 3 treatment modalities in intrabony defects. MATERIALS AND METHODS: 45 intrabony defects in 45 patients had been randomly allocated to receive: modified papilla preservation technique with titanium reinforced e-polytetrafluoroethylene (ePTFE) membranes (MPPT Tit, N=15); access flap with e-PTFE membranes (Flap-ePTFE, N=15); access flap alone (Flap, N=15). Supportive periodontal care (SPC) was provided monthly for 1 year, then every 3 months for 20 years...
October 13, 2016: Journal of Clinical Periodontology
Qingmei Wang, Siguo Chen, Feng Shi, Ke Chen, Yao Nie, Yao Wang, Rui Wu, Jia Li, Yun Zhang, Wei Ding, Yang Li, Li Li, Zidong Wei
A space-confined interfacial conversion approach is developed to directly transform 3 nm solid Pt nanoparticles into a 5 nm hollow PtFe alloy featuring a Pt-skin surface. The approach presented for the structural evolution from solid Pt NPs to hollow PtFe alloy with controlled size, structure, and composition can be applied to other multimetallic electrocatalysts.
October 13, 2016: Advanced Materials
A Veloso, J R Leiza
Cross-contamination from the polymeric material of the vial caps used in size exclusion chromatography (SEC) and high-performance liquid chromatography autosamplers in the low molar mass (LMM) range (<2000 Da) of polymer samples was demonstrated with the help of matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) analysis. It is shown that polyethylene (PE) caps, if exposed to either short or long periods in tetrahydrofuran solvent, might extract oligomers that contaminate the LMM end of the SEC chromatograms...
October 12, 2016: Journal of Chromatographic Science
Michael Woolman, Alessandra Tata, Emma Bluemke, Delaram Dara, Howard J Ginsberg, Arash Zarrine-Afsar
Mass spectrometry imaging with desorption electrospray ionization mass spectrometry (DESI-MS) is used to characterize cancer from ex vivo slices of tissues. The process is time-consuming. The use of tissue smears for DESI-MS analysis has been proposed as it eliminates the time required to snap-freeze and section the tissue. To assess the utility of tissue smears for rapid cancer characterization, principal component analysis (PCA) was performed to evaluate the concordance between DESI-MS profiles of breast cancer from tissue slices and smears prepared on various surfaces...
October 11, 2016: Journal of the American Society for Mass Spectrometry
Lucio Urbani, Riccardo Balestri, Francesco Sidoti, Juri Riccardo Bernardini, Francesco Arces, Gabriella Licitra, Chiara Leoni, Francesco Forfori, Piero Colombatto, Piero Boraschi, Maura Castagna, Piero Buccianti
BACKGROUND: Parenchyma-sparing liver surgery allows resecting hepatic veins (HV) at the hepatocaval confluence with minor (<3 adjacent segments) liver resections. PTFE graft can be used as a bridge to communicating-veins maturation to ensure the correct outflow of the spared liver. We present a video of an intrahepatic cholangiocarcinoma (IC) involving the three HV at the hepatocaval confluence treated with this approach. METHODS: In a 50-year old obese (BMI 44...
October 11, 2016: Annals of Surgical Oncology
Tom Hughes, Nikolaos A Chatzizacharias, James Richards, Simon Harper
INTRODUCTION: Inferior pancreatico-duodenal artery (IPDA) aneurysms are very rare and commonly associated with coeliac axis stenosis or occlusion due to atherosclerosis, thrombosis or median arcuate ligament syndrome. We present a case of a surgical repair of an IPDA aneurysm with the use of a supra-coeliac aorto-hepatic bypass with a polytetrafluoroethylene (PTFE) graft, following a failed initial attempt at an endovascular repair. PRESENTATION: A 75 year old female, who was under investigation for night sweats, was referred to our team with an incidental finding of a 19mm fusiform IPDA aneurysm...
September 26, 2016: International Journal of Surgery Case Reports
Moses Oguntoye, Michael Johnson, Lawrence R Pratt, Noshir S Pesika
We explore the use of vertically aligned carbon nanotube (VACNT) arrays as an electrode in a triboelectric nanogenerator (TENG) that harvests mechanical energy and converts it to electrical energy. When VACNT arrays, 1 cm2 in area, are mechanically contacted with PET and PTFE counter electrodes in vertical contact-separation mode, currents up to 0.16 µA and 0.21 µA, and voltages up to 1.42 V and 3.20 V are obtained, respectively. The VACNT TENG output remains stable even after over 20,000 continuous contact cycles...
October 4, 2016: ACS Applied Materials & Interfaces
Shivali Jindal, Sanjeev Anand, Kang Huang, Julie Goddard, Lloyd Metzger, Jayendra Amamcharla
The development of bacterial biofilms on stainless steel (SS) surfaces poses a great threat to the quality of milk and other dairy products as the biofilm-embedded bacteria can survive thermal processing. Established biofilms offer cleaning challenges because they are resistant to most of the regular cleaning protocols. Sporeforming thermoduric organisms entrapped within biofilm matrix can also form heat-resistant spores, and may result in a long-term persistent contamination. The main objective of this study was to evaluate the efficacy of different nonfouling coatings [AMC 18 (Advanced Materials Components Express, Lemont, PA), Dursan (SilcoTek Corporation, Bellefonte, PA), Ni-P-polytetrafluoroethylene (PTFE, Avtec Finishing Systems, New Hope, MN), and Lectrofluor 641 (General Magnaplate Corporation, Linden, NJ)] on SS plate heat exchanger surfaces, to resist the formation of bacterial biofilms...
September 28, 2016: Journal of Dairy Science
William Deasy, Tom Shepherd, Colin J Alexander, A Nicholas E Birch, K Andrew Evans
INTRODUCTION: Collection of volatiles from plant roots poses technical challenges due to difficulties accessing the soil environment without damaging the roots. OBJECTIVES: To validate a new non-invasive method for passive sampling of root volatiles in situ, from plants grown under field conditions, using solid phase micro-extraction (SPME). METHODS: SPME fibres were inserted into perforated polytetrafluoroethene (PTFE) tubes positioned in the soil next to broccoli plants for collection of root volatiles pre- and post-infestation with Delia radicum larvae...
September 30, 2016: Phytochemical Analysis: PCA
William Deasy, Tom Shepherd, Colin J Alexander, A Nicholas E Birch, K Andrew Evans
INTRODUCTION: Research on plant root chemical ecology has benefited greatly from recent developments in analytical chemistry. Numerous reports document techniques for sampling root volatiles, although only a limited number describe in situ collection. OBJECTIVES: To demonstrate a new method for non-invasive in situ passive sampling using solid phase micro extraction (SPME), from the immediate vicinity of growing roots. METHODS: SPME fibres inserted into polyfluorotetrafluoroethylene (PTFE) sampling tubes located in situ which were either perforated, covered with stainless steel mesh or with microporous PTFE tubing, were used for non-invasive sub-surface sampling of root volatiles from glasshouse-grown broccoli...
September 30, 2016: Phytochemical Analysis: PCA
Sami Al-Nawaiseh, Fabian Thieltges, Zengping Liu, Claudine Strack, Ralf Brinken, Norbert Braun, Marc Wolschendorf, Arvydas Maminishkis, Nicole Eter, Boris V Stanzel
Age related macular degeneration (AMD), retinitis pigmentosa, and other RPE related diseases are the most common causes for irreversible loss of vision in adults in industrially developed countries. RPE transplantation appears to be a promising therapy, as it may replace dysfunctional RPE, restore its function, and thereby vision. Here we describe a method for transplanting a cultured RPE monolayer on a scaffold into the subretinal space (SRS) of rabbits. After vitrectomy xenotransplants were delivered into the SRS using a custom made shooter consisting of a 20-gauge metallic nozzle with a polytetrafluoroethylene (PTFE) coated plunger...
2016: Journal of Visualized Experiments: JoVE
Y-C Li, H-H Kuo, M-H Cheng, C-L Li
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
Jae-Myung Shin, Chena Lee, Jo-Eun Kim, Kyung-Hoe Huh, Won-Jin Yi, Min-Suk Heo, Soon-Chul Choi, Sam-Sun Lee
PURPOSE: The purpose of this study was to investigate appropriate contrast reference values (CRVs) by comparing the contrast in phantom and clinical images. MATERIALS AND METHODS: Phantom contrast was measured using two methods: (1) counting the number of visible pits of different depths in an aluminum plate, and (2) obtaining the contrast-to-noise ratio (CNR) for 5 tissue-equivalent materials (porcelain, aluminum, polytetrafluoroethylene [PTFE], polyoxymethylene [POM], and polymethylmethacrylate [PMMA])...
September 2016: Imaging Science in Dentistry
Daisy Chou, Allan Tulloch, David Cossman, J Louis Cohen, Rajeev Rao, Galinos Barmparas, James Mirocha, Willis Wagner
OBJECTIVES: In selected populations, carotid endarterectomy (CEA) reduces long-term stroke risk. Studies have shown increased risk of restenosis with use of a collagen-impregnated Dacron patch compared to a PTFE patch. There is concern that collagen-impregnation may initiate thrombosis or promote restenosis due to platelet activation. We performed a retrospective analysis of our CEA experience with routine patching using knitted Dacron patches with (Hemashield) and without (Sauvage) collagen-impregnation...
September 22, 2016: Annals of Vascular Surgery
P Dueppers, M Duran, K Grabitz, H Schelzig
BACKGROUND: Abdominal aortic aneurysms (AAA) are a very rare in pediatric patients and can rarely be associated with tuberous sclerosis (TS). Open surgery is the first-line-therapy. We report our experience added by a review on current literature. REPORT: A 9-year old boy with TS and history of two earlier open repairs for AAA presented to our department with a recurrent juxtarenal aortic aneurysm. We performed a PTFE patch plasty. Postoperative course was uneventful...
September 22, 2016: Annals of Vascular Surgery
Ulrich Schneider, Christopher Hofmann, Diana Aicher, Hiroaki Takahashi, Yujiro Miura, Hans-Joachim Schäfers
BACKGROUND: Isolated repair of the regurgitant bicuspid aortic valve (BAV) has yielded suboptimal durability, with annular dilatation being important risk factor for recurrent aortic regurgitation. We hypothesized that adding a suture annuloplasty (SA) should lead to improved repair stability. METHODS: Between July 1999 and September 2014, 268 patients (mean age, 41 ± 13 years, 249 male) underwent isolated BAV repair. From January 2009 to September 2014, 164 consecutive patients (study group) underwent SA using either braided polyester (n = 37) or expanded polytetrafluorethylene (PTFE) (n = 127)...
September 20, 2016: Annals of Thoracic Surgery
Jiaojiao Ren, Lijuan Li, Dandan Zhang, Xiaoli Qiao, Qiongying Lv, Guohua Cao
With the wide use of high-temperature-resistant ceramic matrix composites (CMCs) in aviation and space flight, it is important to detect the quality of the bonding. This paper used terahertz (THz) time-domain spectroscopy nondestructive testing technology to inspect the bonding defects of the CMC. This paper puts forward a method-extraction method, which is applied to make samples to simulate the bonding defect of CMC by embedding polytetrafluoroethylene (PTFE) sheets with 0.12 mm thickness into the adhesive layer and extracting it after curing and presetting the bonding defects...
September 10, 2016: Applied Optics
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