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Horn Dewaynna D a Texas Woman's - - 2014
ABSTRACT Prior research has explored how employees' perceptions of their leaders impact their work attitudes and behaviors. Studies have shown that charismatic leaders motivate individuals to be more engaged and to exhibit more organizational citizenship behaviors. This study considers how a moderator, citizenship pressure, affects how charismatic leaders might inspire ...
Machon Denis D Institut Lumière Matière, UMR 5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France. - - 2014
Below a critical particle size, some pressurized compounds (e.g. TiO2, Y2O3, PbTe) undergo a crystal-to-amorphous transformation instead of a polymorphic transition. This effect reflects the greater propensity of nanomaterials for amorphization. In this work, a panorama of thermodynamic interpretations is given: first, a descriptive analysis based on the energy landscape ...
Murienne Barbara J BJ Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA. Electronic address: - - 2014
Pathological changes in scleral glycosaminoglycan (GAG) content and in scleral mechanical properties have been observed in eyes with glaucoma and myopia. The purpose of this study is to investigate the effect of GAG removal on the scleral mechanical properties to better understand the impact of GAG content variations in the ...
Kim Donghwan D Microelectronics Research Center and Department of Electrical and Computer Engineering, The University of Texas at Austin, 10100 Burnet Road, Building 160, Austin, Texas - - 2014
Pressure-differential microphones inspired by the hearing mechanism of a special parasitoid fly have been described previously. The designs employ a beam structure that rotates about two pivots over an enclosed back volume. The back volume is only partially enclosed due to open slits around the perimeter of the beam. The ...
Gilioli Edmondo E IMEM-CNR, Area delle Scienze 37/A, Parma 43124, - - 2014
The community of material scientists is strongly committed to the research area of multiferroic materials, both for the understanding of the complex mechanisms supporting the multiferroism and for the fabrication of new compounds, potentially suitable for technological applications. The use of high pressure is a powerful tool in synthesizing new ...
Cohen-Tanugi David D Department of Materials Science and Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United - - 2014
Recent advances in the development of nanoporous graphene (NPG) hold promise for the future of water supply by reverse osmosis (RO) desalination. But while previous studies have highlighted the potential of NPG as an RO membrane, there is less understanding as to whether NPG is strong enough to maintain its ...
Popescu Catalin C CELLS-ALBA Synchrotron Light Facility , 08290 Cerdanyola, Barcelona, - - 2014
The high-pressure structural behavior of 30 nm nanoparticles of anatase TiO2 was studied under hydrostatic and quasi-hydrostatic conditions up to 25 GPa. We found that the structural sequence is not sensitive to the use of different pressure transmitting media. Anatase-type nanoparticles exhibit a phase transition beyond 12 GPa toward a ...
Tadashi Ishida - - 2014
Originally discovered by Leonard da Vinci in the 15th century, the force of friction is directly proportional to the applied load (known as Amontons' first law of friction). Furthermore, kinetic friction is independent of the sliding speed (known as Coulomb's law of friction). These empirical laws break down at high ...
Souza Natalie N NN Department of Communication Sciences and Disorders and Knowles Hearing Center, Northwestern University, 2240 Campus Drive, Evanston, Illinois - - 2014
The reliability of nine measures of the stimulus level in the human ear canal was compared by measuring the sensitivity of behavioral hearing thresholds to changes in the depth of insertion of an otoacoustic emission probe. Four measures were the ear-canal pressure, the eardrum pressure estimated from it and the ...
Pantelić Filip F University of Belgrade, Bulevar kralja Aleksandra 73, Belgrade, Serbia - - 2014
The possibility of identifying vibration modes of a double bass bow, with a non-contact measurement of sound pressure in the Very Near Field (VNF) was investigated. This paper shows the application of this cost-effective method for vibroacoustic testings of the bow. The spectra of generated tones do not give sufficient ...
Korcha Rachael A RA Alcohol Research Group, 6475 Christie Ave. Ste. #400, Emeryville, CA 94608, - - 2014
General population studies have shown that pressure from others to change drinking can come from different sources. Receipt of informal pressure (IP) and formal pressure (FP) is known to vary by quantity and consequences of drinking, but less is known about how pressure varies among subgroups of the population. This ...
Imani S Misagh SM Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran - - 2014
In this article, finite element method is used to investigate the mechanical behavior of a stent and to determine the biomechanical interaction between the stent and the artery in a stenting procedure. The main objective of this study is to reach to a model close to a real condition of ...
Pahlevan Niema M NM Medical Engineering, Division of Engineering and Applied Sciences, California Institute of Technology, 1200 East California Boulevard, MC 301-46, Pasadena, CA 91125, - - 2014
The reductionist approach has dominated the fields of biology and medicine for nearly a century. Here, we present a systems science approach to the analysis of physiological waveforms in the context of a specific case, cardiovascular physiology. Our goal in this study is to introduce a methodology that allows for ...
Guardiola Juan J Robley Rex VA Medical Center, University of Louisville, Louisville, Ky., - - 2014
Background: Positive end-expiratory pressure (PEEP) is commonly used in clinical settings. It is expected to affect the input from slowly adapting pulmonary stretch receptors (SARs), leading to altered cardiopulmonary functions. However, we know little about how SARs behave during PEEP application. Objectives: Our study aimed to characterize the behavior of ...
James Gary D GD Department of Anthropology, Binghamton University, Binghamton, New York, 13902; Decker School of Nursing, Department of Bioengineering, Binghamton University, Binghamton, New York, - - 2014
As daily environments change, behavior and activity also change and as blood pressure (BP) and heart rate (HR) are allostatically tied to these factors, one might expect that environments that elicit the greatest behavioral/activity variation should also evince the highest BP and HR variability [standard deviation (SD) or coefficient of ...
Abbas Amr E AE Department of Cardiovascular Medicine, Beaumont Health Systems, Royal Oak, - - 2014
In patients with aortic stenosis (AS) and eccentric transaortic flow, greater pressure loss occurs as the jet collides with the aortic wall together with delayed and diminished pressure recovery. This leads to the elevated transaortic valve pressure gradients noted on both Doppler and cardiac catheterization. Such situations may present a ...
Kim Hack-Lyoung HL Division of Cardiology, Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, - - 2014
Because of the invasive nature of catheterization, limited information is available on hemodynamic interaction between the left ventricle and aorta using invasive aortic pressure monitoring. Our aim was to investigate whether parameters of invasively measured central aortic pressure waveform were related with those of left ventricular (LV) diastolic function. A ...
Lacy Peter S PS University College London and the National Institute for Health Research University College London Hospitals Biomedical Research Centre, - - 2014
Brachial blood pressure increases with exercise and an excessive rise predicts increased cardiovascular risk. Measurement of brachial blood pressure alone may exaggerate the true blood pressure elevation due to exercise-induced change to pressure amplification. Whether blood pressure-lowering treatment modulates pressure amplification during exercise is unknown. Thirty-two participants with stage 1-2 ...
Kim Jeong Yeon JY Department of Neurology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, - - 2014
We investigated the relationship between transcranial Doppler (TCD) pulsatility index (PI) and central aortic pressure by measurement of the aortic augmentation index (AIx). We enrolled 148 consecutive patients with a diagnosis of acute ischemic stroke. Patients were eligible for the study if they experienced their first ischemic stroke within the ...
Hermans Hadewich H KULeuven - - 2014
Transverse aortic constriction (TAC) and Angiotensin II (AngII)subcutaneous osmotic pump infusion are frequently used murine models of pressure overload hypertrophy. The aim of this paper is to investigate time- and stressor dependent functional and structural changes using echocardiographic B-mode, M-mode and Doppler characterization. Ten weeks old male C57BL6/J wild-type mice ...
Ahn Hyo-Suk HS Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, South - - 2014
Pulmonary hypertension (PHT) is not uncommon in patients with aortic stenosis (AS) and portends a dismal prognosis. We attempted to determine the prevalence of PHT and to identify contributors to its development in patients with moderate or severe AS. A total of 189 patients were enrolled. Patients were divided into ...
Mishima Akira A Department of Cardiovascular Surgery, Graduate School of Medical Sciences, Nagoya City University, Nagoya, - - 2014
The aim of this study was to evaluate the mid-term outcomes of a strategy for repair of coarctation of the aorta (CoA) and hypoplastic aortic arch (HAA) with a modified, extended end-to-end repair that preserves the lesser curvature of the aortic arch in neonates with intracardiac defects. We studied 21 ...
van Riel Annelieke C M J AC Department of Cardiology, Academic Medical Center, Amsterdam, The Netherlands; ICIN - Netherlands Heart Institute, Utrecht, The - - 2014
Chronic mitral regurgitation (MR) often leads to diminished right ventricular (RV) function due to long-standing pressure and volume overload. Surgical intervention often adds to the preexisting RV dysfunction. Percutaneous mitral valve (MV) repair can reduce MR, but to what extent this affects the right ventricle is unknown. Consecutive patients scheduled ...
Rateri Debra L DL Saha Cardiovascular Research Center, University of Kentucky, Lexington, - - 2014
Angiotensin II (Ang II) promotes development of ascending aortic aneurysms (AAs), but progression of this pathology is undefined. We evaluated factors potentially involved in progression, and determined the temporal sequence of tissue changes during development of Ang II-induced ascending AAs. Ang II infusion into C57BL/6J mice promoted rapid expansion of the ascending aorta, ...
Torjesen Alyssa A AA From the Cardiovascular Engineering, Inc, Norwood, MA (A.A.T., J.D.G., V.B.); Icelandic Heart Association, Kopavogur, Iceland (S.S., T.A., V.G.); Leiden University Medical Center, Leiden, The Netherlands (J.J.M.W., A.d.R.); University of Iceland, Reykjavik, Iceland (T.A., V.G.); and National Institute on Aging, National Institutes of Health, Bethesda, MD (L.J.L., - - 2014
High pulse pressure, a major cardiovascular risk factor, has been attributed to medial elastic fiber degeneration and aortic dilation, which transfers hemodynamic load to stiffer collagen. However, recent studies suggest higher pulse pressure is instead associated with smaller aortic diameter. Thus, we sought to elucidate relations of pulse pressure with ...
Benito-Lopez Fernando F CIC microGUNE, Arrasate-Mondragón, Spain. fbenito@cicmicrogune.es - - 2014
This paper reports for the first time the use of a cross-linked poly(N-isopropylacrylamide) ionogel encapsulating the ionic liquid 1-ethyl-3-methylimidazolium ethyl sulphate as a thermoresponsive and modular microfluidic valve. The ionogel presents superior actuation behaviour to its equivalent hydrogel. Ionogel swelling and shrinking mechanisms and kinetics are investigated as well as ...
Hua D M DM Guangzhou Institute of Respiratory Disease, State Key Laboratory of Respiratory Disease, the First Affiliated Hospital of Guangzhou Medical University, No. 151 Yanjiang Road, Guangzhou, - - 2014
Controlled twitch mouth pressure (Tw Pmo) via the use of a two-way non-rebreathing valve is a new method to assess diaphragm contractility. The optimal trigger threshold was confirmed. We sought to determine the optimal trigger threshold for 17 healthy subjects (29±4 years) and 17 COPD patients (64±10 years). The Tw ...
Protogerou Athanase D AD aHypertension Center and Cardiovascular Research Laboratory, 1st Department of Propaedeutic Medicine, 'Laiko' Hospital, Medical School bBiomedical Engineering Unit, 1st Department of Cardiology, 'Hippokration' Hospital, Medical School, National and Kapodistrian University of Athens cHypertension Center, 3rd University Department of Medicine, 'Sotiria' Hospital, Athens, Greece dParis Descartes University, AP-HP, Diagnosis and Therapeutic Center, Hôtel-Dieu, Paris, - - 2014
To test the hypothesis that left-ventricular hypertrophy (LVH) is better associated with aortic, than brachial, 24-h average blood pressure (BP) in individuals with hypertension. The office aortic BP is associated better with organ damage, such as LVH, than the office brachial BP; whether the 24-h average aortic BP associates better ...
Abid Leila L Cardiology Department, University Hedi Chaker Hospital, Medicine University of Sfax, - - 2014
Conventional echocardiographic (ECHO) parameters of systolic and diastolic func-tion of the left ventricular (LV) have been shown to be load dependent. However, the impact of pre-load reduction on tissue Doppler (TD) parameters of LV function is incompletely understood. To evaluate the effect of a single hemodialysis (HD) session on LV ...
Oyri Karl K The Intervention Centre, Oslo University Hospital, Oslo, Norway and Institute of Clinical Medicine, University of Oslo , Oslo , - - 2014
Abstract Objectives: To evaluate the level of agreement of simulated wired and Wi-Fi vital signs output from an intra-aortic balloon pump during exposure to electromagnetic interference from frequency overlapping ZigBee sensors. Material and methods: A series of experiments with interference from single and multiple ZigBee sensors were benchmarked with wired ...
Murakami Tomoaki T Department of Cardiology, Chiba Children's Hospital, Japan. Electronic address: - - 2014
Excessive aortic pressure wave reflection is one of the risk factors of cardiovascular diseases. In some clinical course of congenital heart diseases, the elevated pressure wave reflection has been reported. The purpose of this study is to elucidate the risk factors of the enhanced pressure wave reflection in adult patients ...
Covella Michele M aDivision of Internal Medicine and Hypertension Unit, Department of Medical Sciences, University of Torino bDepartment of Health Science, University of Milano-Bicocca and Istituto Auxologico Italiano, Italy *Michele Covella and Alberto Milan contributed equally to the writing of this - - 2014
The risk of thoracic aortic dissection is strictly related to the diameter of the ascending aorta. Arterial hypertension represents a major risk factor for the development of aortic dissection and is thought to be directly involved in the pathogenesis of aortic aneurysms. Recent studies have suggested a high prevalence of ...
Seibert Felix S FS Charité - Campus Benjamin Franklin, Dept. of Nephrology, Berlin, Germany; Universitätsklinik Marienhospital, Ruhr-University Bochum, Medizinische Klinik I, Herne, - - 2014
Calcineurin inhibitors (CNI) are potent vasoconstrictors and induce an acceleration of arteriosclerosis, thus contributing to the cardiovascular risk after renal transplantation. The present study compares the impact of belatacept and cyclosporine A (CsA) on arterial stiffness and central aortic blood pressure. We performed a case-control study in 46 patients (23 ...
Hachiya Kenta K Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, - - 2014
The present study tested the hypothesis that epicardial fat may be associated with augmented central aortic pressure and impaired left ventricular (LV) function. We studied 134 consecutive patients undergoing left-sided cardiac catheterization for coronary artery disease (CAD) and examined the relation of epicardial fat volume measured by multi-detector computed tomography ...
De Groote Katya K Division of Paediatric Cardiology, Department of Paediatrics, Ghent University Hospital, De Pintelaan 185, 3K12D, Administratie pediatrie, B-9000, Ghent, Belgium, - - 2014
Hypertension in Turner syndrome (TS) is a multifactorial, highly prevalent and significant problem that warrants timely diagnosis and rigorous treatment. The objective of this study was to investigate the association between abnormal aortic arch morphology and hypertension in adult TS patients. This was a single centre retrospective study in 74 ...
Roetker Nicholas S NS Division of Epidemiology & Community Health, School of Public Health, University of Minnesota, Minneapolis, - - 2014
Previous research suggests that elevated pulse pressure (PP) is a risk factor for atrial fibrillation (AF) independently of mean arterial pressure (MAP). PP may serve as an indirect measure of aortic stiffness (reduced distensibility), but whether directly measured aortic distensibility is related to risk for AF has not yet been ...
Hashimoto Junichiro J aDepartment of Blood Pressure Research bDivision of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, - - 2014
A pathological connection between the heart and kidney is well recognized as a cardiorenal syndrome, but the underlying mechanism remains undetermined. We hypothesized that this connection is attributable to central haemodynamic alterations. In 386 patients with hypertension, the radial, carotid and femoral pressure waveforms were recorded with applanation tonometry to ...
Mohammadi Mohammad Taghi MT Department of Physiology and Biophysics, School of Medicine, Baqiyatallah University of Medical Sciences, Tehran, Iran. Electronic address: - - 2014
The present study examined genes transcription of tight junction (TJs) proteins of the blood-brain barrier (BBB) and detrimental effects on the brain tissue after acute hypertension.The experiment was performed in two groups of rats, sham and hypertensive. Rats were made acutely hypertensive by aortic constriction above the renal arteries. After ...
Davis Margot K MK Divisions of *Cardiovascular Medicine and †Cardiovascular Surgery, Stanford University School of Medicine, Stanford, - - 2014
Microbubbles formed by cavitation have been frequently reported in patients with mechanical heart valves (MHVs), but have not previously been described in patients with continuous-flow left ventricular assist devices (LVADs). Obstruction of the LVAD circuit by thrombus, outflow graft kinking, or cannula malposition may cause high pressure gradients and turbulent ...
Burgoyne Steven - - 2014
We intended to determine if acute baroreflex activation therapy (BAT) increases venous capacitance and aortic conductance. BAT is effective in resistant hypertension but its effect on the systemic vasculature is poorly understood. Left ventricular (LV) and aortic pressures and sub-diaphragmatic aortic and caval flows (ultrasonic) were measured in 6 anesthetized ...
Schultz Martin G MG From the Menzies Research Institute Tasmania, University of Tasmania, Hobart, Tasmania, Australia (M.G.S., A.H., J.E.S.); International Centre for Circulatory Health, Imperial College London, London, United Kingdom (J.E.D., M.M, M.D.); Royal Hobart Hospital, Hobart, Tasmania, Australia (S.P.); and Institute of Cardiovascular Science, University College London, London, United Kingdom - - 2014
Aortic reservoir pressure indices independently predict cardiovascular events and mortality. Despite this, there has never been a study in humans to determine whether the theoretical principles of the mathematically derived aortic reservoir pressure (RPderived) and excess pressure (XPderived) model have a real physiological basis. This study aimed to directly measure ...
Vukicevic M M 1Mechanical and Bioengineering Engineering, Clemson University, Clemson, SC, USA 2Laboratory of Biological Structure Mechanics, Politecnico di Milano, Milan, Italy 3Cardiothoracic Surgery, Great Ormond Street Hospital for Children, London, United - - 2014
Respiration influences the subdiaphragmatic venous return in the total cavopulmonary connection (TCPC) of the Fontan circulation whereby both the inferior vena cava (IVC) and hepatic vein flows can experience retrograde motion. Controlling retrograde flows could improve patient outcomes. Using a patient-specific model within a Fontan mock circulatory system with respiration, ...
Wybraniec Maciej T MT First Department of Cardiology, Medical University of Silesia, Upper Silesia Medical Center, Katowice, Poland. Electronic address: - - 2014
The study aimed to evaluate plasma renalase level, a recently discovered kidney-derived catecholamine-metabolizing enzyme in patients after successful repair of aortic coarctation, with special consideration of arterial hypertension in the context of underlying process of arterial remodeling. This case-control study covered 50 consecutive patients after Dacron patch repair of aortic ...
Trudeau Luc L Cardiovascular Prevention Centre, Department of Internal Medicine, Jewish General Hospital, McGill University, Montreal, Québec, Canada. Electronic address: - - 2014
The measurement of central blood pressure has generated interest as a tool in predicting cardiovascular events. The purpose of this article is to review the meaning and measurement of the central blood pressure and consider its potential value as an index of the antihypertensive response. Indirect estimation of central aortic ...
Chaudhury Kaustav K Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur-721302, - - 2014
We study the influence of disjoining pressure for moving long bubbles inside cylindrical capillaries. Towards that end, consistent thin-film equations, for the annular region separating the bubble from the channel surface, are presented with specific emphasis on three different attributes: (a) the van der Waals interaction, formalized by the classical ...
Wang Jingtao J School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of - - 2014
When a globule with a complete symmetry (such as simple spherical droplets and concentric double emulsions) is transiting in a constriction tube, there is only one pattern of the transition. However, for a multiple-emulsion globule with asymmetric internal structures, there are many possible patterns with different pressure drops Δp due ...
Mutabaruka Patrick P LMGC, UMR 5508, Université Montpellier 2, CNRS, Place E. Bataillon, 34095 Montpellier, - - 2014
By means of coupled molecular dynamics-computational fluid dynamics simulations, we analyze the initiation of avalanches in a granular bed of spherical particles immersed in a viscous fluid and inclined above its angle of repose. In quantitative agreement with experiments, we find that the bed is unstable for a packing fraction ...
Alós Josep J Instituto Mediterráneo de Estudios Avanzados, IMEDEA (CSIC-UIB) C/Miquel Marqués 21, 07190, Esporles, Illes Balears, Spain ; Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Müggelseedamm 310, 12587, Berlin, - - 2014
Harvesting wild animals may exert size-independent selection pressures on a range of morphological, life history, and behavioral traits. Most work so far has focused on selection pressures on life history traits and body size as morphological trait. We studied here how recreational fishing selects for morphological traits related to body ...
Lennon-Edwards Shannon - - 2014
Increased potassium intake has been shown to lower blood pressure (BP) even in the presence of high sodium consumption however the role of dietary potassium on vascular function has received less attention. The aim of this study was to evaluate the relationship between habitual intake of sodium (Na) and potassium ...
Yu Danyang D School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, - - 2014
In previous research, time-delay (Δt) was a more important parameter than the reflection coefficient in the individual transfer function of central aortic pressure reconstruction. The Δt can be obtained by electrocardiography (ECG) or phonocardiography (PCG). Because the pre-ejection period remains an uncertain factor, the present study used ECG and PCG ...
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