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M T Camci, P Aydogan, B Ulgut, C Kocabas, S Suzer
We present an X-ray photoelectron spectroscopic (XPS) investigation of potential screening across two gold electrodes fabricated on a porous polymer surface which is impregnated with the ionic liquid (IL) N-N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide [DEME-TFSI]. The IL provides a sheet of conducting layers to the insulating polymer film, and allows monitoring charging and screening dynamics at the polymer + IL/vacuum interface in a laterally resolved fashion across the electrodes...
October 19, 2016: Physical Chemistry Chemical Physics: PCCP
Toshihiro Shoji, Sho Okada, Yuji Ohno, Atsushi Nakagomi, Yoshihide Fujimoto, Yosihio Kobayashi
OBJECTIVE: Pulse wave velocity is a non-invasive method that is useful not only for estimating arterial stiffness but also screening cardiovascular events in the general population. Upstroke time (UT) and % mean artery pressure (% MAP) are novel, adjunctive indices for arterial stiffness that are derived from morphology analysis of the pulse wave during brachial-ankle pulse wave velocity (baPWV) measurement. Several studies have shown the association between UT and coronary artery calcification score as assessed by multi-detector computed tomography (MDCT)...
September 2016: Journal of Hypertension
Toshihiro Shoji, Sho Okada, Yuji Ohno, Atsushi Nakagomi, Yoshihide Fujimoto, Yosihio Kobayashi
OBJECTIVE: Pulse wave velocity is a non-invasive method that is useful not only for estimating arterial stiffness but also screening cardiovascular events in the general population. Upstroke time (UT) and % mean artery pressure (% MAP) are novel, adjunctive indices for arterial stiffness that are derived from morphology analysis of the pulse wave during brachial-ankle pulse wave velocity (baPWV) measurement. Several studies have shown the association between UT and coronary artery calcification score as assessed by multi-detector computed tomography (MDCT)...
September 2016: Journal of Hypertension
Archana Srinivasan, Nicolas G Biro, Ann P Murchison, Robert C Sergott, Mark L Moster, Pascal M Jabbour, Jurij R Bilyk
PURPOSE: To evaluate the diagnostic sensitivity and specificity of orbital color Doppler imaging (CDI) and conventional neuroimaging (CT/MRI) compared with cerebral angiography in patients with carotid-cavernous fistulas (CCFs). METHODS: The study design was a retrospective patient chart and imaging review. The authors reviewed 655 charts of all patients who underwent CDI and neuroimaging (CT/MRI) between 2006 and 2015 at one institution. Sixty patients had a presumptive diagnosis of CCF without thrombosis...
September 6, 2016: Ophthalmic Plastic and Reconstructive Surgery
J C L Rodrigues, T Erdei, A G Dastidar, B McIntyre, A E Burchell, L E K Ratcliffe, E C Hart, M C K Hamilton, J F R Paton, A K Nightingale, N E Manghat
Left atrial enlargement (LAE) has adverse prognostic implications in hypertension. We sought to determine the accuracy of five electrocardiogram (ECG) criteria for LAE in hypertension relative to cardiac magnetic resonance (CMR) gold standard and investigate the effect of concomitant obesity. One hundred and thirty consecutive patients (age: 51.4±15.1 years, 47% male, 51% obese, systolic blood pressure (BP): 171±29 mm Hg, diastolic BP: 97±15 mm Hg) referred for CMR (1.5 T) from a tertiary hypertension clinic were included...
September 8, 2016: Journal of Human Hypertension
Tianlong Li, Jinxing Li, Hongtao Zhang, Xiaocong Chang, Wenping Song, Yanan Hu, Guangbin Shao, Elodie Sandraz, Guangyu Zhang, Longqiu Li, Joseph Wang
The swimming locomotion of fish involves a complex interplay between a deformable body and induced flow in the surrounding fluid. While innovative robotic devices, inspired by physicomechanical designs evolved in fish, have been created for underwater propulsion of large swimmers, scaling such powerful locomotion into micro-/nanoscale propulsion remains challenging. Here, a magnetically propelled fish-like artificial nanoswimmer is demonstrated that emulates the body and caudal fin propulsion swimming mechanism displayed by fish...
September 7, 2016: Small
Michael Gonsior, Frank Ramsthaler, Christoph Birngruber, Martin Obert, Marcel A Verhoff
The assessment of ossification of the medial clavicular epiphysis plays a decisive role in the forensic age estimation of living subjects. Primarily for reasons of minimizing the radiation exposure currently associated with such evaluations, non-ionizing methods would be an advance.This study pursued the question whether full union of the medial clavicular epiphysis, visualized by high-frequency sonography, is a reliable criterion for age-threshold determinations. The ossification stage of the medial clavicular epiphysis of 215 female and 195 male volunteers, aged between 14 and 26 years, was evaluated in bilateral sonograms...
November 2016: International Journal of Legal Medicine
Luigi Di Serafino, Gabriella Scognamiglio, Maurizio Turturo, Giovanni Esposito, Riccardo Savastano, Saverio Lanzone, Bruno Trimarco, Carlo D'Agostino
BACKGROUND: Coronary angiography has poor predictive value for functionally significant coronary artery stenosis. The Fractional Flow Reserve (FFR) currently represents the gold standard to define the ischemic potential of epicardial stenosis and, recently, the instantaneous wave-free ratio (iFR), has also been introduced as alternative to the FFR, but it still remains an invasive procedure. We aimed this study in order to evaluate the accuracy of the "Angiography-DeriveD hEmoDynamic index" (ADDED index) to predict the FFR as compared with the iFR...
November 15, 2016: International Journal of Cardiology
Dingwen He, Jiawei Yan, Feng Zhu, Yongliang Zhou, Bingwei Mao, Alexander Oleinick, Irina Svir, Christian Amatore
The individual electrochemical anodic responses of dopamine (DA), epinephrine (EP), and pyrocatechol (CT) were investigated at arrays of recessed gold disk-microelectrodes arrays (MEAs) covered by a gold plane electrode and compared to those of their binary mixture (CT and EP) when the top-plane electrode was operated as a bipolar electrode or as a collector. The interferent species (EP) displays a chemically irreversible wave over the same potential range as the chemically reversible ones of DA or CT. As expected, in the generator-collector (GC) mode, EP did not contribute to the redox cycling amplification that occurred only for DA or CT...
September 6, 2016: Analytical Chemistry
Monica Ecobici, M Voiculescu
INTRODUCTION: Cardiovascular events represent an important cause of morbidity and mortality in the entire population. Arterial stiffness is currently considered one of the most important risk factors for the development of cardiovascular events. The gold-standard for evaluating arterial stiffness is pulse wave velocity (PWV). Recent studies have demonstrated that PWV is an independent risk factor regarding the development of cardiovascular events, especially in certain categories of patients...
August 4, 2016: Romanian Journal of Internal Medicine, Revue Roumaine de Médecine Interne
Naoki Kanazawa, Taichi Goto, Koji Sekiguchi, Alexander B Granovsky, Caroline A Ross, Hiroyuki Takagi, Yuichi Nakamura, Mitsuteru Inoue
Magnonics is an emerging field dealing with ultralow power consumption logic circuits, in which the flow of spin waves, rather than electric charges, transmits and processes information. Waves, including spin waves, excel at encoding information via their phase using interference. This enables a number of inputs to be processed in one device, which offers the promise of multi-input multi-output logic gates. To realize such an integrated device, it is essential to demonstrate spin wave interferometers using spatially isotropic spin waves with high operational stability...
2016: Scientific Reports
Anna S Emelina, Mikhail Yu Emelin, Rashid A Ganeev, Masayuki Suzuki, Hiroto Kuroda, Vasily V Strelkov
The high-order harmonic generation (HHG) in silver, gold, and zinc plasma plumes irradiated by orthogonally polarized two-color field is studied theoretically and experimentally. We find an increase of the HHG efficiency in comparison with the single-color case, which essentially depends on the plasma species and harmonic order. An increase of more than an order of magnitude is observed for silver plasma, whereas for gold and zinc it is lower; these results are reproduced in our calculations that include both propagation and microscopic response studies...
June 27, 2016: Optics Express
Victoria García-Espinosa, Santiago Curcio, Marco Marotta, Juan M Castro, Maite Arana, Gonzalo Peluso, Pedro Chiesa, Gustavo Giachetto, Daniel Bia, Yanina Zócalo
The aims were to determine whether children's high peripheral blood pressure states (HBP) are associated with increased central aortic blood pressure (BP) and to characterize hemodynamic and vascular changes associated with HBP in terms of changes in cardiac output (stroke volume, SV), arterial stiffness (aortic pulse wave velocity, PWV), peripheral vascular resistances (PVR) and net and relative contributions of reflected waves to the aortic pulse amplitude. We included 154 subjects (mean age 11; range 4-16 years) assigned to one of two groups: normal peripheral BP (NBP, n = 101), defined as systolic and diastolic BP < 90th percentile, or high BP (HBP, n = 53), defined as average systolic and/or diastolic BP levels ≥90th percentile (curves for sex, age and body height)...
October 2016: Pediatric Cardiology
Jinfen Yu, Yanfei Du, Yong Lu, Weidong Zhang, Dongsheng Zhang, Guangbin Wang, Chuanting Li
OBJECTIVES: To explore the utility of diffusion tensor imaging (DTI) and acoustic radiation force impulse (ARFI) imaging in the diagnosis of parotid tumours. METHODS: 51 patients with parotid tumours were examined with DTI on 3.0-T MRI and ARFI imaging on an ultrasound scanner before surgery. Values of apparent diffusion coefficient (ADC), fractional anisotropy (FA) and shear-wave velocity (SWV) were calculated and analyzed with independent samples Wilcoxon-Mann-Whitney test...
2016: Dento Maxillo Facial Radiology
Chris L de Korte, Stein Fekkes, Aart J Nederveen, Rashindra Manniesing, Hendrik Rik H G Hansen
Cardiovascular disease (CVD) is a leading cause of death and is in the majority of cases due to the formation of atherosclerotic plaques in arteries. Initially, thickening of the inner layer of the arterial wall occurs. Continuation of this process leads to plaque formation. The risk of a plaque to rupture and thus to induce an ischemic event is directly related to its composition. Consequently, characterization of the plaque composition and its proneness to rupture are of crucial importance for risk assessment and treatment strategies...
October 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Hassan A Chami, Ramachandran S Vasan, Martin G Larson, Emelia J Benjamin, Gary F Mitchell, Daniel J Gottlieb
OBJECTIVE: Sleep-disordered breathing is associated with hypertension and cardiovascular disease. Increased aortic stiffness is one possible linking mechanism. We evaluated the association between sleep-disordered breathing and aortic stiffness in a community-based sample. METHODS: Our community-based cross-sectional observational study included 381 participants from the Framingham Heart Study (55% women, mean age 58.0 S.D. = 9.4 years, 51% ethnic minorities)...
March 2016: Sleep Medicine
D G Kotsifaki, M Kandyla, P G Lagoudakis
Plasmonic optical tweezers are a ubiquitous tool for the precise manipulation of nanoparticles and biomolecules at low photon flux, while femtosecond-laser optical tweezers can probe the nonlinear optical properties of the trapped species with applications in biological diagnostics. In order to adopt plasmonic optical tweezers in real-world applications, it is essential to develop large-scale fabrication processes without compromising the trapping efficiency. Here, we develop a novel platform for continuous wave (CW) and femtosecond plasmonic optical tweezers, based on gold-coated black silicon...
2016: Scientific Reports
Christina Lambertz, Ariadna Martos, Andreas Henkel, Andreas Neiser, Torben-Tobias Kliesch, Andreas Janshoff, Petra Schwille, Carsten Sönnichsen
We use individual gold nanorods as pointlike detectors for the intrinsic dynamics of an oscillating biological system. We chose the pattern forming MinDE protein system from Escherichia coli (E. coli), a prominent example for self-organized chemical oscillations of membrane-associated proteins that are involved in the bacterial cell division process. Similar to surface plasmon resonance (SPR), the gold nanorods report changes in their protein surface coverage without the need for fluorescence labeling, a technique we refer to as NanoSPR...
June 8, 2016: Nano Letters
Cigdem Ozsoy-Keskinbora, Chris B Boothroyd, Rafal E Dunin-Borkowski, Peter A van Aken, Christoph T Koch
Electron holography is a powerful technique for characterizing electrostatic potentials, charge distributions, electric and magnetic fields, strain distributions and semiconductor dopant distributions with sub-nm spatial resolution. Mapping internal electrostatic and magnetic fields within nanoparticles and other low-dimensional materials by TEM requires both high spatial resolution and high phase sensitivity. Carrying out such an analysis fully quantitatively is even more challenging, since artefacts such as dynamical electron scattering may strongly affect the measurement...
June 2016: Ultramicroscopy
P Vitry, E Bourillot, L Tétard, C Plassard, Y Lacroute, E Lesniewska
Atomic force microscopy (AFM) and other techniques derived from AFM have revolutionized the understanding of materials and biology at the nanoscale, but mostly provide surface properties. The observation of subsurface nanoscale features and properties remains a great challenge in nanometrology. The operating principle of the mode-synthesizing AFM (MSAFM) is based on the interaction of two ultrasonic waves, one launched by the AFM probe fp , a second launched by the sample fs , and their resulting nonlinear frequency mixing...
September 2016: Journal of Microscopy
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