Read by QxMD icon Read


Hyungsub Park, Kwangmin Kim
The incidence of an isolated femoral vessel injury in the absence of fractures or other organ injury is extremely rare. A 20-yr-old male Korean soldier was taken to the hospital with a common femoral artery (CFA) obstruction. Injured CFA segment was resected and replaced by using 7-mm PTFE (polytetrafluoroethylene) graft. Two months after the surgical treatment, the patient discharged from the hospital without any complaints or postoperative complications. We report an unusual case of isolated femoral artery injury due to blunt trauma during military service with following review of literature...
March 14, 2018: Military Medicine
Huijuan Guo, Xueting Jia, Lu Liu, Xia Cao, Ning Wang, Zhong Lin Wang
Recent development of interactive motion-tracking and positioning technologies is attracting increased interests in the many areas, such as wearable electronics, intelligent electronic and internet of things. For example, the so-called somatosensory technology can afford users strong empathy of immersion and realism due to their consistent interaction with the game. Here, we report a noncontact self-powered positioning and motion-tracking system based on freestanding triboelectric nanogenerator (TENG). The TENG was fabricated by nano-engineered surface in the contact-separation mode with the use of a free moving human body (hands or foot) as the trigger...
March 14, 2018: ACS Nano
K Michael Salerno, Noam Bernstein
Coarse-grained (CG) polymer simulations can access longer times and larger lengths than all-atom (AA) molecular dynamics simulations, however not all CG models correctly reproduce polymer properties on all length scales. Here we coarse grain atomistic position data from polyethylene (PE) and polytetrafluoroethylene (PTFE) melt simulations by combining λ backbone carbon atoms in a single CG bead. Resulting CG variables have correlations along the chain backbone that depend on the coarse-graining scale λ, and are generally not reproduced by independent bond-length, bond-angle and torsion-angle distributions...
March 12, 2018: Journal of Chemical Theory and Computation
Jerzy Wloch, Artur Piotr Terzyk, Marek Wiśniewski, Piotr Kowalczyk
The aim of this study is to link polytetrafluoroethylene (PTFE) surface characteristics with its wetting properties in the nanoscale. To do this using Molecular Dynamics (MD) simulation three series of rough PTFE surfaces were generated by the annealing and compressing, and next characterized by the application of the MD version of the Atomic Force Microscopy (AFM) method. The values of specific surface areas were additionally calculated. The TIP4P/2005 water model was used to the study of wetting properties of obtained PTFE samples...
March 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Po-Hsun Lin, Ren-Yang Horng, Shu-Fang Hsu, Shiao-Shing Chen, Chia-Hua Ho
More than 80% of ammonia (NH₃) in the steel manufacturing process wastewater is contributed from the coking wastewater, which is usually treated by biological processes. However, the NH₃ in the coking wastewater is typically too high for biological treatment due to its inhibitory concentration. Therefore, a two-stage process including a hollow fiber membrane contactor (HFMC) and a modified membrane distillation (MD) system was developed and applied to reduce and recover NH₃ from coking wastewater. The objectives of this paper are to evaluate different membrane materials, receiving solutions, and operation parameters for the system, remove NH₃ from the coking wastewater to less than 300 mg N/L, which is amenable to the biological process, and recover ammonia solution for reuse...
March 3, 2018: International Journal of Environmental Research and Public Health
Peng Zhao, Jun Xie, Fu Gu, Nusrat Sharmin, Philip Hall, Jianzhong Fu
Separation becomes a bottleneck of dealing with the enormous stream of waste plastics, as most of the extant methods can only handle binary mixtures. In this paper, a novel method that based on magnetic levitation was proposed for separating multiple mixed plastics. Six types of plastics, i.e., polypropylene (PP), acrylonitrile butadiene styrene (ABS), polyamide 6 (PA6), polycarbonate (PC), polyethylene terephthalate (PET), and polytetrafluoroethylene (PTFE), were used to simulate the mixed waste plastics. The samples were mixed and immersed into paramagnetic medium that placed into a magnetic levitation configuration with two identical NdFeB magnets with like-poles facing each other, and Fourier transform infrared (FTIR) spectroscopy was employed to verify the separation outputs...
March 2, 2018: Waste Management
Hamid Reza Mahdavi, Mehran Arzani, Mojgan Isanejad, Toraj Mohammadi
Cationic dyes mixture pertraction experiments of Rhodamine B (RhB) and Methylene Blue (MB) using a flat sheet supported liquid membrane (SLM) were performed. Mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) mixture was used as carrier and Sesame oil to dilute the carrier due to its very high viscosity. Acetic acid (AA) was also used as stripper phase. Influences of hydrophobic and hydrophilic nanoparticles were loaded in a carrier at different loadings (from 0 to 6 mg mL-1 ) on dyes pertraction at constant operating conditions were investigated...
March 1, 2018: Journal of Environmental Management
Mathieu van Steenberghe, Thomas Schubert, Caroline Bouzin, Carlo Caravaggio, Yves Guiot, Daela Xhema, Pierre Gianello
BACKGROUND: There is a need for small caliber vascular prosthesis. Synthetic grafts are hindered by thrombogenicity and rapid occlusion. Decellularized matrices could be an alternative. We assessed in vitro and in vivo the biocompatibility of porcine artery treated with a chemical/physical process for decellularization and graft securization with non/conventional pathogens inactivation. METHODS: Porcine carotid arteries (PCA) were treated. First, biopsies (n=4/tissue) were performed before/after treatment to assess decellularization (HE / DAPI / DNA / Miller)...
February 28, 2018: Annals of Vascular Surgery
Simon Vergnaud, Valéry-Pierre Riche, Philippe Tessier, Nicolas Mauduit, Adrien Kaladji, Yann Gouëffic
OBJECTIVES: To evaluate the budget impact of progressive replacement of standard polytetrafluoroethylene (PTFE) grafts by heparin-bound PTFE (Propaten) for below-the-knee (BTK) bypass in patients with critical limb ischaemia (CLI). DESIGN: From a review of the scientific literature, we calculated a theoretical BTK primary patency for Propaten grafts. Using the French hospital expenditure database (PMSI), we retrospectively estimated a rehospitalisation rate for standard PTFE grafts...
February 28, 2018: BMJ Open
P R González, D Mendoza-Anaya, H J Virafuentes-Chávez, J Azorín
A new α-Al2 O3 doped with Tm3+ ions was obtained by combustion method; doped α-Al2 O3 in the powder form was mixed with polytetrafluoroethylene resin (PTFE) to obtain dosimeters in pellet form, in order to be used as radiation dosimeter. The glow curve, linearity, lower detection limit, repeatability and fading, were studied. The kinetic parameters were determined by deconvolution method. Morphological characteristics were studied by low vacuum scanning electron microscopy and X-ray diffraction. Results showed that α-Al2 O3 +PTFE obtained is a promising material to radiation dosimetry...
February 13, 2018: Applied Radiation and Isotopes
F Oldhafer, K I Ringe, K Timrott, M Kleine, O Beetz, W Ramackers, S Cammann, J Klempnauer, F W R Vondran, H Bektas
PURPOSE: Treatment of malignancies invading the hepatic veins/inferior vena cava is a surgical challenge. An ante situm technique allows luxation of the liver in front of the situs to perform tumor resection. Usually, cold perfusion and veno-venous bypass are applied. Our experience with modified ante situm resection relying only on total vascular occlusion is reported. METHODS: Retrospective analysis on an almost 15-year experience with ante situm resection without application of cold perfusion or veno-venous bypass RESULTS: The ante situm technique was applied on eight patients...
February 22, 2018: Langenbeck's Archives of Surgery
Yifei Gu, Wenxin Yu, Yunbo Jin, Hui Chen, Gang Ma, Shih-Jen Chang, Xiaoxi Lin
Importance: Expanded polytetrafluoroethylene (ePTFE) is a widely used alloplast, but studies of augmentation of the nasal tip and nasal dorsum with ePTFE are lacking. Objective: To investigate whether attaching the conchal cartilage as shield grafts at the distal end of the graft can prevent extrusion and whether the use of ePTFE in the nasal tip can achieve a stable aesthetic outcome. Design, Setting, and Participants: A randomized clinical trial was performed from April 1, 2006, to October 31, 2008...
February 22, 2018: JAMA Facial Plastic Surgery
Thomas A Heafner, Clayton Lewis, Graham Baluh, Michael Clemens, Brandon Propper, Zachary M Arthurs
BACKGROUND: Despite improved peri-operative care, prosthetic graft infections continue to cause substantial morbidity and mortality. Contemporary graft infection models have tested a conduit's infectability using varying concentrations without standardization. Using a static assay in vitro model, we sought to evaluate the impact of inoculation concentration on vascular conduit attachment. METHODS: The 2-hour and 24-hour attachment of Staphylococcus aureus TCH1516 and Pseudomonas aeruginosa PA01-UW were determined on polytetrafluoroethylene (PTFE), Dacron® , nitinol, cobalt chromium, and Viabahn® (W...
February 21, 2018: Surgical Infections
Yanfei Liu, Tonghu Xiao, Chenghuan Bao, Jifei Zhang, Xing Yang
This study proposes using membrane distillation (MD) as an alternative to the conventional multi-stage flushing (MSF) process to concentrate a semi-product of organic fertilizer. By applying a unique asymmetric polyvinylidene fluoride (PVDF) membrane, which was specifically designed for MD applications using a nonsolvent thermally induced phase separation (NTIPS) method, the direct contact membrane distillation (DCMD) performance was investigated in terms of its sustainability in permeation flux, fouling resistance, and anti-wetting properties...
February 16, 2018: Membranes
Htoo W Paing, R Kenneth Marcus
A practical method for preparation of solution residue samples for analysis utilizing the ambient desorption liquid sampling-atmospheric pressure glow discharge optical emission spectroscopy (AD-LS-APGD-OES) microplasma is described. Initial efforts involving placement of solution aliquots in wells drilled into copper substrates, proved unsuccessful. A design-of-experiment (DOE) approach was carried out to determine influential factors during sample deposition including solution volume, solute concentration, number of droplets deposited, and the solution matrix...
February 20, 2018: Analyst
Christopher W Mercer, Shawn C West, Mahesh S Sharma, Masahiro Yoshida, Victor O Morell
OBJECTIVE: Our institution uses a valved polytetrafluoroethylene conduit as an alternative to homografts. The objective of this study was to investigate the performance of bicuspid valved polytetrafluoroethylene conduits used for right ventricular outflow tract reconstruction in children aged less than 2 years and to evaluate risk factors for earlier conduit explant. METHODS: We performed an Institutional Review Board-approved retrospective chart review of all patients aged less than 2 years who underwent surgical right ventricular outflow tract reconstruction with a bicuspid valved polytetrafluoroethylene conduit or homograft conduit from July 2004 to December 2014...
January 31, 2018: Journal of Thoracic and Cardiovascular Surgery
Katharina Schoene, Philipp Sommer, Arash Arya, Martin Kostelka, Friedrich W Mohr, Martin Misfeld, Marcel Vollroth, Andreas Bollmann, Julia Lurz, Gerhard Hindricks, Joerg Seeburger
Aims: Results of catheter based interventional treatment for pulmonary vein stenosis (PVS) following radiofrequency ablation (RFA) for atrial fibrillation remain suboptimal. Surgical repair may represent an alternative therapy, though long-term results have not been thoroughly investigated. Methods and results: We retrospectively assessed all patients in our centre undergoing surgical repair for radiofrequency-induced PVS. Data regarding surgical technique, clinical outcome, and rate of pulmonary vein (PV) restenosis were collected and analysed...
February 12, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Hendrik Woehlk, Jan Steinkoenig, Christiane Lang, Lukas Michalek, Vanessa Trouillet, Peter Krolla-Sidenstein, Anja S Goldmann, Leonie Barner, James P Blinco, Christopher Barner-Kowollik, Kathryn E Fairfull-Smith
We pioneer a versatile surface modification strategy based on mussel inspired oxidative catecholamine polymerization for the design of nitroxide containing thin polymer films. A 3,4-dihydroxy-L-phenylalanine (L-DOPA) monomer equipped with a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derived oxidation-labile hydroxylamine functional group is employed as a universal coating agent to generate polymer scaffolds with persistent radical character. Various types of materials including silicon, titanium, ceramic alumina and inert poly(tetrafluoroethylene) (PTFE) were successfully coated with poly(DOPA-TEMPO) thin films in a one-step dip-coating procedure under aerobic, slightly alkaline (pH 8...
February 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Graeme K Ambler, Christopher P Twine
BACKGROUND: Femoro-popliteal bypass is implemented to save limbs that might otherwise require amputation, in patients with ischaemic rest pain or tissue loss; and to improve walking distance in patients with severe life-limiting claudication. Contemporary practice involves grafts using autologous vein, polytetrafluoroethylene (PTFE) or Dacron as a bypass conduit. This is the second update of a Cochrane review first published in 1999 and last updated in 2010. OBJECTIVES: To assess the effects of bypass graft type in the treatment of stenosis or occlusion of the femoro-popliteal arterial segment, for above- and below-knee femoro-popliteal bypass grafts...
February 11, 2018: Cochrane Database of Systematic Reviews
Andrey Shishov, Marcin Wieczorek, Paweł Kościelniak, Danuta Dudek-Adamska, Anna Telk, Leonid Moskvin, Andrey Bulatov
An automated continuous homogeneous microextraction approach based on a flow system has been developed and coupled with a hydride generation atomic fluorescence spectrometry system (HG-AFS). The developed approach was applied for the determination of trace arsenic and selenium in environmental water and liver samples. The nonanoic acid was investigated as a switchable hydrophilicity solvent (SHS) for homogeneous microextraction of As(III) and Se(IV) complexes with pyrrolidinedithiocarbamate (PDC). The procedure involved on-line mixing ammonium PDC (aqueous phase), sodium nonanoate (aqueous phase) and acid sample solution resulting in the formation of SHS (nonanoic acid) dispersed into the acid aqueous phase...
May 1, 2018: Talanta
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"