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https://www.readbyqxmd.com/read/29320155/transparent-and-waterproof-ionic-liquids-based-fibers-for-highly-durable-multifunctional-sensors-and-strain-insensitive-stretchable-conductors
#1
Song Chen, Haizhou Liu, Shuqi Liu, Pingping Wang, Songshan Zeng, Luyi Sun, Lan Liu
Ionic liquids (ILs) are regarded as ideal components in the next generation of strain sensors because their ultralow modulus can commendably circumvent or manage the mechanical mismatch in traditional strain sensors. In addition to strain sensors, stretchable conductors with strain-insensitive conductance are also indispensable in artificial systems for connecting and transporting electrons, similar to the function of blood vessels in the human body. In this work, two types of ILs-based conductive fibers were fabricated by developing hollow fibers with specific micro-scale channels which were then filled with ILs...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29311751/measurement-and-correlation-of-the-viscosity-of-1-1-1-2-2-4-5-5-5-nonafluoro-4-trifluoromethyl-3-pentanone
#2
Chenyang Wen, Xianyang Meng, Marcia L Huber, Jiangtao Wu
The Paris Agreement on climate change, in which many nations have agreed to limit greenhouse gas emissions, has spurred interest in developing working fluids with low global warming potential (GWP) that can satisfy environmental concerns and have thermophysical properties that can meet engineering performance requirements. One such fluid is 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone (also known as Novec-649 and Novec-1230), which has potential applications in organic Rankine cycles (ORC), electronics cooling, computer/data center cooling and fire extinguishing...
October 12, 2017: Journal of Chemical and Engineering Data
https://www.readbyqxmd.com/read/29273907/comparison-of-the-atmospheric-and-reduced-pressure-hs-spme-strategies-for-analysis-of-residual-solvents-in-commercial-antibiotics-using-a-steel-fiber-coated-with-a-multiwalled-carbon-nanotube-polyaniline-nanocomposite
#3
Ali Reza Ghiasvand, Kolsoum Nouriasl, Fatemeh Yazdankhah
A low-cost, sensitive and reliable reduced-pressure headspace solid-phase microextraction (HS-SPME) setup was developed and evaluated for direct extraction of residual solvents in commercial antibiotics, followed by determination by gas chromatography with flame ionization detection (GC-FID). A stainless steel narrow wire was made porous and adhesive by platinization by a modified electrophoretic deposition method and coated with a polyaniline/multiwalled carbon nanotube nanocomposite. All experimental variables affecting the extraction efficiency were investigated for both atmospheric-pressure and reduced-pressure conditions...
December 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29246917/acist-ffr-study-assessment-of-catheter-based-interrogation-and-standard-techniques-for-fractional-flow-reserve-measurement
#4
William F Fearon, Jeffrey W Chambers, Arnold H Seto, Ian J Sarembock, Ganesh Raveendran, Charlotte Sakarovitch, Lingyao Yang, Manisha Desai, Allen Jeremias, Matthew J Price
BACKGROUND: Measurement of fractional flow reserve (FFR) to guide coronary revascularization lags despite robust supportive data, partly because of the handling characteristics of traditional coronary pressure wires. An optical pressure-monitoring microcatheter, which can be advanced over a traditional coronary guidewire, facilitates FFR assessment but may underestimate pressure wire-derived FFR. METHODS AND RESULTS: In this prospective, multicenter trial, 169 patients underwent FFR assessment with a pressure wire alone and with a pressure microcatheter over the pressure wire...
December 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29229263/the-hemodynamic-effects-of-different-pacing-modalities-after-cardiopulmonary-bypass-in-patients-with-reduced-left-ventricular-function
#5
R C W Gielgens, I H F Herold, A H M van Straten, B M van Gelder, F A Bracke, H H M Korsten, M A Soliman Hamad, R A Bouwman
OBJECTIVES: Patients with decreased left ventricular function undergoing cardiac surgery have a greater chance of difficult weaning from cardiopulmonary bypass and a poorer clinical outcome. Directly after weaning, interventricular dyssynchrony, paradoxical septal motion, and even temporary bundle-branch block might be observed. In this study, the authors measured arterial dP/dtmax, mean arterial pressure (MAP), and cardiac index using transpulmonary thermodilution, pulse contour analysis, and femoral artery catheter and compared the effects between right ventricular (A-RV) and biventricular (A-BiV) pacing on these parameters...
July 8, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29228086/new-methods-to-study-the-microcirculation
#6
Damiano Rizzoni, Claudia Agabiti Rosei, Carolina De Ciuceis, Francesco Semeraro, Marco Rizzoni, Franco Docchio
Essential hypertension is associated with structural alterations in the microvessels; in particular, an increase in the media thickness to internal lumen ratio of small resistance arteries (MLR) and a reduction in capillary density have been observed. The evaluation of the morphological characteristics of small resistance arteries in humans is challenging. The gold standard method is generally considered to be the measurement by wire or pressure micromyography of MLR of subcutaneous small vessels obtained by local biopsies...
December 7, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29224304/-method-for-recording-tension-changes-of-small-pulmonary-artery-and-vein-using-the-isolated-vessel-tension-measurement-system
#7
X T Wu, M D Kuang, X Ouyang, Y Li, M M Yuan, W J Lu, J Wang, Y Q Chen
Objective: To establish a standardized method for isolated pulmonary artery and vein rings with different diameter, pressure and length, which could provide a more scientific method for in vitro study of pulmonary vessel diseases. Methods: Male SD rats were anesthetized, and the right ventricular systolic pressure were measured. Small pulmonary artery and vein rings with 200-400 μm in diameter and 2 mm in length were prepared by dissecting pulmonary arteries and veins. The pulmonary vessel rings were mounted in the organ bath by 2 stainless steel wires with diameter of 40 μm...
December 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29212858/decreased-edhf-mediated-relaxation-is-a-major-mechanism-in-endothelial-dysfunction-in-resistance-arteries-in-aged-mice-on-prolonged-high-fat-sucrose-diet
#8
Shannon M Dunn, Kumuda C Das
High-fat sucrose (HFS) diet in aged individuals causes severe weight gain (obesity) with much higher risk of cardiovascular diseases such as hypertension or atherosclerosis. Endothelial dysfunction is a major contributor for these vascular disorders. We hypothesize that prolonged ingestion of HFS diet by aged mice would accentuate endothelial dysfunction in the small resistance arteries. Male C57BL/6J mice at 12 weeks of age were divided into four groups and fed either normal chow (NC) or high-fat sucrose diet (HFS)...
December 2017: Physiological Reports
https://www.readbyqxmd.com/read/29141949/microvascular-insulin-resistance-in-skeletal-muscle-and-brain-occurs-early-in-the-development-of-juvenile-obesity-in-pigs
#9
T Dylan Olver, Zachary Ian Grunewald, Thomas J Jurrissen, Rebecca Ek MacPherson, Paul J LeBlanc, Teagan R Schnurbusch, Alana M Czajkowski, Maurice Harold Laughlin, R Scott Rector, Shawn B Bender, Eric M Walters, Craig A Emter, Jaume Padilla
BACKGROUND: Impaired microvascular insulin signaling may develop prior to overt indices of microvascular endothelial dysfunction and represent an early pathological feature of adolescent obesity. Using a translational porcine model of juvenile obesity, we tested the hypotheses that in the early stages of obesity development, impaired insulin signaling manifests in skeletal muscle (triceps), brain (prefrontal cortex) and corresponding vasculatures, and that depressed insulin-induced vasodilation is reversible with acute inhibition of protein kinase C beta (PKCβ)...
November 15, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29128827/a-comparison-study-on-a-sulfonated-graphene-polyaniline-nanocomposite-coated-fiber-for-analysis-of-nicotine-in-solid-samples-through-the-traditional-and-vacuum-assisted-hs-spme
#10
Alireza Ghiasvand, Samira Koonani, Fatemeh Yazdankhah, Saeid Farhadi
A simple, rapid, and reliable headspace solid-phase microextraction (HS-SPME) procedure, reinforced by applying vacuum in the extraction vial, was developed. It was applied for the extraction of nicotine in solid samples prior to determination by gas chromatography-flame ionization detection (GC-FID). First, the surface of a narrow stainless steel wire was made porous and adhesive by platinization to obtain a durable, higher surface area, and resistant fiber. Then, a thin film of sulfonated graphene/polyaniline (Sulf-G/PANI) nanocomposite was synthesized and simultaneously coated on the platinized fiber using the electrophoretic deposition (EPD) method...
November 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29124264/laser-structured-janus-wire-mesh-for-efficient-oil-water-separation
#11
Yu-Qing Liu, Dong-Dong Han, Zhi-Zhen Jiao, Yan Liu, Hao-Bo Jiang, Xuan-Hang Wu, Hong Ding, Yong-Lai Zhang, Hong-Bo Sun
We report here the fabrication of a Janus wire mesh by a combined process of laser structuring and fluorosilane/graphene oxide (GO) modification of the two sides of the mesh, respectively, toward its applications in efficient oil/water separation. Femtosecond laser processing has been employed to make different laser-induced periodic surface structures (LIPSS) on each side of the mesh. Surface modification with fluorosilane on one side and GO on the other side endows the two sides of the Janus mesh with distinct wettability...
November 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/29114011/albuterol-delivery-efficiency-in-a-pediatric-model-of-noninvasive-ventilation-with-double-limb-circuit
#12
Jeanne Velasco, Ariel Berlinski
BACKGROUND: Noninvasive ventilation (NIV) is used to treat respiratory failure in patients with concomitant need for aerosol delivery. Limited pediatric data are available on aerosol delivery efficiency, and none at all regarding aerosol delivery efficiency with a double-limb circuit. We compared the effect of position in the double-limb ventilator circuit, types of nebulizer, and ventilator settings on aerosol delivery efficiency in a pediatric model of NIV. We hypothesized that placing a vibrating mesh nebulizer at the ventilator and using the highest inspiratory pressures would increase aerosol delivery efficiency...
November 7, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29113999/index-of-microcirculatory-resistance-at-the-time-of-primary-percutaneous-coronary-intervention-predicts-early-cardiac-complications-insights-from-the-oxami-oxford-study-in-acute-myocardial-infarction-cohort
#13
Gregor Fahrni, Mathias Wolfrum, Giovanni Luigi De Maria, Florim Cuculi, Sam Dawkins, Mohammad Alkhalil, Niket Patel, John C Forfar, Bernard D Prendergast, Robin P Choudhury, Keith M Channon, Adrian P Banning, Rajesh K Kharbanda
BACKGROUND: Early risk stratification after primary percutaneous coronary intervention (PPCI) for ST-segment-elevation myocardial infarction is currently challenging. Identification of a low-risk group may improve triage of patients to alternative clinical pathways and support early hospital discharge. Our aim was to assess whether the index of microcirculatory resistance (IMR) at the time of PPCI can identify patients at low risk of early major cardiac complications and to compare its performance against guideline-recommended risk scores...
November 7, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29113864/observations-from-a-real-time-ifr-ffr-hybrid-approach-in-patients-with-severe-aortic-stenosis-and-coronary-artery-disease-undergoing-tavi
#14
Roberto Scarsini, Gabriele Pesarini, Mattia Lunardi, Anna Piccoli, Claudia Zanetti, Rosaria Cantone, Michele Bellamoli, Valeria Ferrero, Leonardo Gottin, Giuseppe Faggian, Flavio Ribichini
BACKGROUND: The complexity of coronary physiology in presence of severe aortic stenosis (AS) raises concerns about the reliability of pressure-derived indexes in this clinical setting. Furthermore, neither fractional flow reserve (FFR) nor instantaneous wave-free period (iFR) has been validated in AS. Combining iFR and FFR in a tailored decision-making strategy may help to increase simplicity, accuracy and safety of physiology-guided revascularization in AS. METHODS: In this prospective observational study iFR and FFR were measured before and after TAVI during the same procedure in patients with severe AS and concomitant coronary artery disease (CAD)...
October 3, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29112510/prediction-of-postpercutaneous-coronary-intervention-myocardial-infarction-insights-from-intravascular-imaging-coronary-flow-and-biomarker-evaluation
#15
Stephen P Hoole, Jules Hernández-Sánchez, Adam J Brown, Joel P Giblett, Martin R Bennett, Nick E J West
BACKGROUND: Percutaneous coronary intervention-induced myocardial infarction (PMI) has prognostic significance. Identifying patients at high risk for PMI is desirable as it may alter strategy and facilitate early preventative therapy. We therefore sought to establish whether preprocedural demographic, interventional (plaque characteristics and coronary microcirculatory function), and inflammatory, endothelial damage, and platelet-derived biomarker data could predict the risk of PMI. PATIENTS AND METHODS: We performed target vessel pressure wire to assess fractional flow reserve, index of microcirculatory resistance (IMR) and coronary flow reserve, plaque characterization by virtual histology intravascular ultrasound, and assayed peripheral biomarkers before uncomplicated PCI in 88 patients...
November 6, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/29103656/percutaneous-coronary-intervention-in-stable-angina-orbita-a-double-blind-randomised-controlled-trial
#16
Rasha Al-Lamee, David Thompson, Hakim-Moulay Dehbi, Sayan Sen, Kare Tang, John Davies, Thomas Keeble, Michael Mielewczik, Raffi Kaprielian, Iqbal S Malik, Sukhjinder S Nijjer, Ricardo Petraco, Christopher Cook, Yousif Ahmad, James Howard, Christopher Baker, Andrew Sharp, Robert Gerber, Suneel Talwar, Ravi Assomull, Jamil Mayet, Roland Wensel, David Collier, Matthew Shun-Shin, Simon A Thom, Justin E Davies, Darrel P Francis
BACKGROUND: Symptomatic relief is the primary goal of percutaneous coronary intervention (PCI) in stable angina and is commonly observed clinically. However, there is no evidence from blinded, placebo-controlled randomised trials to show its efficacy. METHODS: ORBITA is a blinded, multicentre randomised trial of PCI versus a placebo procedure for angina relief that was done at five study sites in the UK. We enrolled patients with severe (≥70%) single-vessel stenoses...
November 1, 2017: Lancet
https://www.readbyqxmd.com/read/29101020/angiography-based-quantitative-flow-ratio-for-online-assessment-of-coronary-stenosis-favor-ii-china-study
#17
Bo Xu, Shengxian Tu, Shubin Qiao, Xinkai Qu, Yundai Chen, Junqing Yang, Lijun Guo, Zhongwei Sun, Zehang Li, Feng Tian, Weiyi Fang, Jiyan Chen, Wei Li, Changdong Guan, Niels R Holm, William Wijns, Shengshou Hu
OBJECTIVES: To assess the diagnostic performance of quantitative flow ratio (QFR) for diagnosis of hemodynamically-significant coronary stenosis defined by fractional flow reserve (FFR) ≤0.80. BACKGROUND: QFR is a novel angiography-based method for deriving FFR without pressure wire or induction of hyperemia. The accuracy of QFR when assessed online in the catheterization laboratory has not been adequately examined to date. METHODS: This prospective, multicenter trial enrolled patients who had at least one lesion with diameter stenosis of 30-90% and reference diameter ≥ 2mm by visual estimation...
October 20, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29092495/a-platform-for-exploding-wires-in-different-media
#18
Ruoyu Han, Jiawei Wu, Aici Qiu, Haibin Zhou, Yanan Wang, Jiaqi Yan, Weidong Ding
A platform SWE-2 used for single wire explosion experiments has been designed, established, and commissioned. This paper describes the design and initial experiments of SWE-2. In summary, two pulsed current sources based on pulse capacitors and spark gaps are adopted to drive sub-microsecond and microsecond time scale wire explosions in a gaseous/liquid medium, respectively. In the initial experiments, a single copper wire was exploded in air, helium, and argon with a 0.1-0.3 MPa ambient pressure as well as tap water with a 283-323 K temperature, 184-11 000 μS/cm conductivity, or 0...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29092480/development-of-a-spectro-electrochemical-cell-for-soft-x-ray-photon-in-photon-out-spectroscopy
#19
Tomoko Ishihara, Takashi Tokushima, Yuka Horikawa, Masaru Kato, Ichizo Yagi
We developed a spectro-electrochemical cell for X-ray absorption and X-ray emission spectroscopy, which are element-specific methods to study local electronic structures in the soft X-ray region. In the usual electrochemical measurement setup, the electrode is placed in solution, and the surface/interface region of the electrode is not normally accessible by soft X-rays that have low penetration depth in liquids. To realize soft X-ray observation of electrochemical reactions, a 15-nm-thick Pt layer was deposited on a 150-nm-thick film window with an adhesive 3-nm-thick Ti layer for use as both the working electrode and the separator window between vacuum and a sample liquid under atmospheric pressure...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29075013/fibrin-glue-as-agent-for-sealing-corneal-and-conjunctival-wound-leaks
#20
C Scalcione, D Ortiz-Vaquerizas, D G Said, H S Dua
PurposeTo describe a novel use of fibrin glue in managing leaking blebs and leaking wounds following trauma or surgery.MethodsInterventional case series.ResultsWe report eight patients, including three where intra-operative or immediate post-penetrating keratoplasty recalcitrant leaks from the graft-host junction and/or openings created by the needle pass, were noted. All three had thin recipient beds in the sector of leak. This was managed by intra-cameral injection of fibrin glue in the affected quadrant...
October 27, 2017: Eye
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