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Results 301 - 350 of 1976
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Swiety-Pospiech A - - 2013
Broadband dielectric spectroscopy and pressure-temperature-volume methods are employed to investigate the effect of hydrostatic pressure on the conductivity relaxation time (τσ), both in the supercooled and glassy states of protic ionic liquid lidocaine hydrochloride monohydrate. Due to the decoupling between the ion conductivity and structural dynamics, the characteristic change in ...
McCarthy B M - - 2013
Pulse transit time (PTT) is defined as the time it takes the blood pressure (BP) wave to propagate from the heart to a specified point on the body. After an initial BP measurement, PTT can track BP over short periods of time. This paper evaluates two PTT algorithms: Chen's and ...
Ng Kim-Gau - - 2013
Standardized protocols for validating the clinical accuracy of noninvasive blood pressure (NIBP) monitors have been available since 1987. Some of them were developed by standards bodies and others by professional organizations. They have been well-tested through use and progressively improved through multiple revisions; however, many methodological differences exist between them. ...
Mathern Ryan Michael - - 2013
Abstract This paper presents the designs of four low-cost and ruggedized biomedical devices, including a blood pressure monitor, thermometer, weighing scale and spirometer, designed for the East African context. The design constraints included a mass-production price point of $10, accuracy and precision comparable to commercial devices and ruggedness to function ...
Miller Scott F - - 2013
The model-based, rapid-prototyping-enabled design and manufacture of a pulsatile blood vessel (PBV) for high-fidelity mannequin-based clinical simulations is presented. The PBV presented here is a pressurized, flexible tube with alternating fluid pressure created by a pump to mimic the behavior of a human vessel in response to pulsatile pressure. The ...
Muntner Paul - - 2013
Blood pressure (BP) is known to vary over time within individuals. Although variability between office visits has traditionally been regarded as a barrier to the accurate measurement of BP, several recent studies have reported strong associations between visit-to-visit variability (VVV) of BP and increased risk for cardiovascular outcomes. In this ...
Basiri Parsa Jalal - - 2013
A low pressure pilot scale hydrodynamic cavitation (HC) reactor with 30L volume, using fixed scrap iron sheets, as the heterogeneous catalyst, with no external source of H2O2 was devised to investigate the effects of operating parameters of the HC reactor performance. In situ generation of Fenton reagents suggested an induced ...
Loubeyre Louis - - 2013
Brillouin and Raman scattering experiments on methanol through its glass transition under pressure are reported. The Brillouin scattering data were analyzed using viscoelastic theory and a fit to the Vinet equation of state. The variation in the linewidth of the longitudinal acoustic mode with pressure shows a broad maximum centered ...
Yedukondalu N - - 2013
High pressure behavior of potassium chlorate (KClO3) has been investigated from 0 to 10 GPa by means of first principles density functional theory calculations. The calculated ground state parameters, transition pressure, and phonon frequencies using semiempirical dispersion correction scheme are in excellent agreement with experiment. It is found that KClO3 ...
Reynolds A M - - 2013
Composite correlated random walks have been posited has a strong alternative to Lévy walks as models of multi-scale forager movement patterns. Here it is shown that if plastic then intrinsic composite correlated random walks will under selection pressures evolve to resemble optimal Lévy walks when foraging is non-destructive. The fittest ...
Schlabs Thomas T Department of Orthopedic Surgery, University of California-San Diego Medical Center, San Diego, California, USA. - - 2013
For future space exploration missions, it is important to determine the best method of simulating on Earth cardiovascular and biomechanical conditions for lunar and Martian gravities. For this purpose, we compared exercise performed within a lower body negative pressure (LBNP) and a lower body positive pressure (LBPP) chamber. Twelve subjects ...
Burtch Nicholas C - - 2013
Fundamental insight into how low pressure adsorption properties are affected by chemical functionalization is critical to the development of next-generation porous materials for postcombustion CO2 capture. In this work, we present a systematic approach to understanding low pressure CO2 affinity in isostructural metal-organic frameworks (MOFs) using molecular simulations and apply ...
de Groot Sonja - - 2013
The purpose of this study was to evaluate the effect of wheelchair mass, solid vs. pneumatic tires and tire pressure on physical strain and wheelchair propulsion technique. 11 Able-bodied participants performed 14 submaximal exercise blocks on a treadmill with a fixed speed (1.11m/s) within 3 weeks to determine the effect ...
Ji Fu-Hai - - 2013
Stroke volume variation (SVV) is a robust indicator of fluid responsiveness during volume change. We compared the sensibility of SVV by Vigileo/Flotrac to central venous pressure (CVP) when volume changes in patients undergoing intraoperative acute normovolemic hemodilution (ANH) and acute hypervolemic hemodilution (AHH). Forty patients were randomly divided into an ...
Becerro de Bengoa Vallejo Ricardo - - 2013
Background: Abnormal plantar pressures are the hallmark characteristic of several conditions and pathologic abnormalities. Pressure platforms allow for quick and accurate screening of patients and help guide clinical treatment. However, it is essential to evaluate the reliability and repeatability of these devices before making clinical decisions. The purpose of this ...
Chatzichristodoulou C - - 2013
An electrochemical test station capable of operating at pressures up to 100 bars and temperatures up to 400 °C has been established. It enables control of the partial pressures and mass flow of O2, N2, H2, CO2, and H2O in a single or dual environment arrangement, measurements with highly corrosive media, ...
Chen Li - - 2013
A sharp-interface immersed boundary lattice Boltzmann method (IBLBM) is developed to reduce spurious-pressure oscillations in moving boundary problems. We adopt a cut-cell-based method, i.e., the partially saturated computational cell method, because the primary cause of spurious-pressure oscillations is the failure to obey the geometric conservation law near the boundary in ...
Schmiedeberg Michael - - 2013
By using molecular-dynamics simulations, we determine the jamming phase diagrams at high densities for a bidisperse mixture of soft spheres that interact according to repulsive power-law pair potentials. We observe that the relaxation time varies nonmonotonically as a function of density at constant temperature. Therefore, the jamming phase diagrams contain ...
Sun Hui - - 2013
Growing environmental concerns and the need for better power balancing and frequency control have increased attention in renewable energy sources such as the reversible pump-turbine which can provide both power generation and energy storage. Pump-turbine operation along the S-shaped curve can lead to difficulties in loading the rejection process with ...
Habibi Ehsanollah - - 2013
Among the most important and effective factors affecting the efficiency of the human workforce are accuracy, promptness, and ability. In the context of promoting levels and quality of productivity, the aim of this study was to investigate the effects of exposure to noise on the rate of errors, speed of ...
Ford Michael T - - 2013
By drawing from theoretical perspectives suggesting that unfair conditions threaten fundamental psychological needs, perceived unfairness at work was proposed and tested as a predictor of resting blood pressure. As part of the Midlife Development in the United States Biomarkers project, participants completed questionnaires measuring perceived unfairness, self-esteem and coworker support. ...
Veríssimo Helena - - 2013
The concept of Ecological Potential was explored using the macrobenthic communities of the Mondego estuary (Portugal). Different scenarios (loss of a primary producer and intertidal habitat, and habitat modification due to hydromorphological changes and continued press perturbation) were tested to predict changes in the biology if hydromorphological pressures could be ...
De Somer F - - 2013
Based on their design, all membrane oxygenators generate a certain resistance to flow. In clinical practice, this resistance is calculated by measuring both blood flow and the pressure drop over the oxygenator. Historically, some designs, such as the Kolobow spiral coil oxygenator and the Cobe flat sheet oxygenator, had quite ...
Amaraesekera Bernard - - 2013
A robust, modular, semi-automated synthesis unit useful for conducting radiochemical reactions under pressurized conditions (up to ∼200psi [1.4MPa]) for the production of PET biomarkers has been developed. This compact unit (7.6cm×33.0cm×58.4cm) is capable of performing any single step reaction that is generally encountered in radiochemical syntheses, and multiple units can ...
Prigozhin Maxim B MB Department of Chemistry, Center for the Physics of Living Cells and Beckman Institute, University of Illinois, Urbana, IL 61801, - - 2013
Using a newly developed microsecond pressure-jump apparatus, we monitor the refolding kinetics of the helix-stabilized five-helix bundle protein λ*YA, the Y22W/Q33Y/G46,48A mutant of λ-repressor fragment 6-85, from 3 μs to 5 ms after a 1,200-bar P-drop. In addition to a microsecond phase, we observe a slower 1.4-ms phase during refolding ...
Dellarole Mariano - - 2013
The 2/2 hemoglobin of the cyanobacterium Synechococcus sp. PCC 7002, GlbN, coordinates the heme iron with two histidines and exists either with a b heme or with a covalently attached heme. The binding of exogenous ligands displaces the distal histidine and induces a conformational rearrangement involving the reorganization of internal ...
Brook Robert D - - 2013
Many antihypertensive medications and lifestyle changes are proven to reduce blood pressure. Over the past few decades, numerous additional modalities have been evaluated in regard to their potential blood pressure-lowering abilities. However, these nondietary, nondrug treatments, collectively called alternative approaches, have generally undergone fewer and less rigorous trials. This American ...
Fallas Morgane M - - 2013
The influence of pressure on the retention of several types of solute, including acids, bases and neutrals, was studied by the use of restriction capillaries added to the end of various monomeric and polymeric octadecylsilyl-modified 5μm particle size columns. Although it appeared that certain polymeric columns could give somewhat greater ...
Pedrueza Esteban - - 2013
A study based on photoluminescence and absorption measurements as a function of temperature and pressure for PbSe nanocrystals with sizes in the range 3-13 nm reveals the influence of size quantum confinement on the observed variation. In the case of the temperature variation, the effective bandgap changes from showing a positive ...
Hikal Walid M - - 2013
We report the direct determination of vapor pressures and optical and thermodynamic parameters of powders of low-volatile materials in their vapor phase using a commercial UV/Vis spectrometer. This methodology is based on the linear proportionality between the density of the saturated gas of the material and the absorbance of the ...
Starr D E - - 2013
Heterogeneous chemical reactions at vapor/solid interfaces play an important role in many processes in the environment and technology. Ambient pressure X-ray photoelectron spectroscopy (APXPS) is a valuable tool to investigate the elemental composition and chemical specificity of surfaces and adsorbates on the molecular scale at pressures of up to 130 ...
Errandonea Daniel - - 2013
Zircon-type PrVO4 and SmVO4 have been studied by high-pressure Raman spectroscopy up to 17 GPa. The occurrence of phase transitions has been detected when compression exceeds 6 GPa. The transformations are not reversible. Raman spectra of the high-pressure phases show similarities with those expected for a monazite-type phase in PrVO4 ...
Liang Yang-Min - - 2013
Due to granule size, substrate and oxygen become limited in the core of granules leading to cell lysis at the core. Loss of granule stability is still a major barrier for practical application of AG. Compared to ambient pressure condition (AP), operation of AG under high pressure (HP) is a ...
Zhan Xiancheng - - 2013
Abstract Objective: To establish a new osmotic pressure measuring method with a wide measuring range. Method: The osmotic pressure of drug solutions is determined by measuring the relative air humidity in equilibrium with the solution. The freezing point osmometry is used as a control. Results: The data obtained by the ...
Yokokawa Fumiaki - - 2013
Introduction: The renin-angiotensin-aldosterone system (RAAS) has long been established as a key pathway in the regulation of blood pressure and body fluid volume. The aspartic protease renin is responsible for the initial and rate-limiting step of the RAAS; hence inhibition of renin would favor an upstream blockade or modulation of ...
Wang Qiong - - 2013
How underwater diving effects the function of the arterial wall and the activities of endothelial cells is the focus of recent studies on decompression sickness. Here we describe an in vitro diving system constructed to achieve real-time monitoring of cell activity during simulated dives under fluorescent microscopy and confocal microscopy. ...
Ikeyama Kazuyuki - - 2013
BACKGROUND: We previously showed that application of hydraulic pressure to cultured human keratinocytes induced elevation of intracellular calcium concentration ([Ca(2+) ]i ), but the absolute value of the pressure could not be determined. PURPOSE: To evaluate the effect of the absolute value of pressure on keratinocytes and other skin cells. ...
Badrov Mark B - - 2013
Isometric handgrip (IHG) training lowers resting blood pressure (BP) in both hypertensives and normotensives, yet the effect of training dose on the magnitude of reduction and the mechanisms associated with the hypotensive response are elusive. We investigated, in normotensive women, the effects of two different doses of IHG training on ...
Kuruppu Dulanji - - 2013
OBJECTIVE: Se is an antioxidant micronutrient and has been studied for its potential role in CVD prevention. The purpose of the present study was to conduct a systematic review of the literature on the relationship between Se and hypertension. DESIGN: We conducted a systematic literature search in PubMed and OVID ...
Nelson Joan M - - 2013
AIMS AND OBJECTIVES: To evaluate constructs from the theory of planned behavior (TPB, Ajzen 2002) - attitudes, sense of control, subjective norms and intentions - as predictors of accuracy in blood pressure monitoring. BACKGROUND: Despite numerous initiatives aimed at teaching blood pressure measurement techniques, many healthcare providers measure blood pressures ...
Kolling William M - - 2013
Objective. To assess the effectiveness of using a vapor pressure osmometer to measure the accuracy of pharmacy students' compounding skills. Design. Students calculated the theoretical osmotic pressure (mmol/kg) of a solution as a pre-laboratory exercise, compared their calculations with actual values, and then attempted to determine the cause of any ...
Chen Hongzhang - - 2013
A self-designed novel solid-state fermentation (SSF) bioreactor named "gas double-dynamic solid-state fermentation bioreactor (GDSFB)" showed great success in processes for the production of several valuable products. For the present study, a simple GDSFB (2 L in volume) was designed to investigate the impact of exhaust time on SSF performance. Both air ...
Cheng Tian-Le - - 2013
The self-assembly behavior of shape-anisotropic particles at curved fluid interfaces is computationally investigated by diffuse interface field approach (DIFA). A Gibbs-Duhem-type thermodynamic formalism is introduced to treat heterogeneous pressure within the phenomenological model, in agreement with Young-Laplace equation. Computer simulations are performed to study the effects of capillary forces (interfacial ...
Elliott William J - - 2013
Hypertension is an important public health problem both in the United States and worldwide, contributing to many forms of cardiovascular and renal diseases. Although great strides have been made in the proportion of the US population that achieves recommended blood pressure targets, many Americans still have undertreated and uncontrolled blood ...
Swann Alan C AC Department of Psychiatry and Behavioral Sciences, The University of Texas Health Science Center at Houston, 1941 East Road, Room 3216, Houston, TX 77054, USA. - - 2013
Rapid-response impulsivity, characterized by inability to withhold response to a stimulus until it is adequately appraised, is associated with risky behavior and may be increased in a state-dependent manner by norepinephrine. We assessed effects of yohimbine, which increases norepinephrine release by blocking alpha-2 noradrenergic receptors, on plasma catecholamine metabolites, blood ...
Joyner Michael J - - 2013
This focused review serves to explore relevant issues in regard to blood pressure regulation and by doing so, provides the initial stimulus paper for the Thematic Review series "Blood Pressure Regulation" to be published in the European Journal of Applied Physiology over the coming months. In this introduction, we highlight ...
Roskes Marieke - - 2013
Four experiments were designed to test the hypothesis that performance is particularly undermined by time pressure when people are avoidance motivated. The results supported this hypothesis across three different types of tasks, including those well suited and those ill suited to the type of information processing evoked by avoidance motivation. ...
Dey Zita Ranajoy - - 2013
Abstract Pressure mapping techniques are used in wheelchair and seating services to assess posture and assist in the prevention and treatment of pressure ulcers. The Force Sensitive Application (FSA) pressure mapping systems in Wales have a high clinical use and frequent calibration is required. This project aimed to assess the ...
Chicote Juan C - - 2013
Principal component analysis and functional regression are combined in a model to analyze a time series of pressure maps. The model is tested measuring the pressures over a chair seat while a subject performs a combination of simple movements. A sampling rate of 3 Hz is adequate for applying the ...
Bapat Prasad N - - 2013
We report the effect of applied pressure on the dielectric properties of the B2 phase of a bent-core liquid crystal. This study on bent-core banana-shaped molecules shows that while the dielectric anisotropy hardly varies with pressure, the relaxation parameters associated with the rotation around the long axes of the molecules ...
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