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https://www.readbyqxmd.com/read/28645085/extending-the-functionality-of-the-slurry-ferrihydrite-dgt-method-performance-evaluation-for-the-measurement-of-vanadate-arsenate-antimonate-and-molybdate-in-water
#1
Shu Zhang, Paul N Williams, Chun-Yang Zhou, Lena Q Ma, Jun Luo
The monitoring of oxyanions in waters, presents significant challenges due to their relatively low concentrations, and a characteristically changeable/unstable/reactive geochemistry with high spatial and temporal turnover. This results in a very heterogeneous pattern of mobility and bioavailability, which is difficult to capture reliably and in a cost effective manner. The diffusive gradients in thin-films (DGT) technique is a popular analytical tool for testing water quality, primarily because it provides a time-integrated measurement...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28645021/development-a-validated-highly-sensitive-lc-ms-ms-method-for-simultaneous-quantification-of-ledipasvir-sofosbuvir-and-its-major-metabolite-gs-331007-in-human-plasma-application-to-a-human-pharmacokinetic-study
#2
Ola M Abdallah, Ahmed M Abdel-Megied, Amira S Gouda
A highly sensitive and rapid LC-MS/MS method was developed, fully optimized and validated for the simultaneous determination of Ledipasvir (LED) and Sofosbuvir (SOF) in the presence of its major metabolite GS-331007 in human plasma using Daclatasvir as internal standard (IS). The extraction of analytes and IS from plasma was performed using liquid-liquid extraction with ethyl acetate. The chromatographic separation of these prepared samples was achieved on Xterra MS C8 column (4.6×50mm,5μm) using gradient elution with a mobile phase of ammonium formate buffer (pH 3...
June 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28644924/intravenous-thrombolysis-for-acute-ischemic-stroke-a-bridge-between-two-centuries
#3
Georgios Tsivgoulis, Odysseas Kargiotis, Andrei Alexandrov
Intravenous tissue-plasminogen activator (tPA) remains the only approved systemic reperfusion therapy suitable for most patients presenting timely with acute ischemic stroke. Accumulating real-word experience for over 20 years regarding tPA safety and effectiveness lead to re-appraisal of original contraindications for intravenous thrombolysis (IVT). Areas covered: This narrative review focuses on fast yet appropriate selection of patients for safe administration of tPA per recently expanded indications. Novel strategies for rapid patient assessment will be discussed...
June 23, 2017: Expert Review of Neurotherapeutics
https://www.readbyqxmd.com/read/28644399/effects-of-biochar-derived-sewage-sludge-on-heavy-metal-adsorption-and-immobilization-in-soils
#4
Dan Zhou, Dan Liu, Fengxiang Gao, Mengke Li, Xianping Luo
The object of this study was to evaluate the effect of sewage sludge biochar on adsorption and mobility of Cr, Mn, Cu, and Zn. Biochar (BC400) was produced via pyrolysis of municipal sewage sludge at 400 °C. Maximum adsorption capacities (qm) for Zn, Cr, Mn, and Cu were 5.905, 5.724, 5.681, and 5.342 mg·g(-1), respectively, in the mono-metal solution and 2.475, 8.204, 1.01, and 5.415 mg·g(-1), respectively, in the multi-metal solution. The adsorption capacities for Mn, Cu, and Zn decreased in the multi-metal solution due to competitive adsorption, whereas the capacity for Cr increased...
June 23, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28644378/an-energy-efficient-multi-tier-architecture-for-fall-detection-using-smartphones
#5
M Amac Guvensan, A Oguz Kansiz, N Cihan Camgoz, H Irem Turkmen, A Gokhan Yavuz, M Elif Karsligil
Automatic detection of fall events is vital to providing fast medical assistance to the causality, particularly when the injury causes loss of consciousness. Optimization of the energy consumption of mobile applications, especially those which run 24/7 in the background, is essential for longer use of smartphones. In order to improve energy-efficiency without compromising on the fall detection performance, we propose a novel 3-tier architecture that combines simple thresholding methods with machine learning algorithms...
June 23, 2017: Sensors
https://www.readbyqxmd.com/read/28644375/gaden-a-3d-gas-dispersion-simulator-for-mobile-robot-olfaction-in-realistic-environments
#6
Javier Monroy, Victor Hernandez-Bennets, Han Fan, Achim Lilienthal, Javier Gonzalez-Jimenez
This work presents a simulation framework developed under the widely used Robot Operating System (ROS) to enable the validation of robotics systems and gas sensing algorithms under realistic environments. The framework is rooted in the principles of computational fluid dynamics and filament dispersion theory, modeling wind flow and gas dispersion in 3D real-world scenarios (i.e., accounting for walls, furniture, etc.). Moreover, it integrates the simulation of different environmental sensors, such as metal oxide gas sensors, photo ionization detectors, or anemometers...
June 23, 2017: Sensors
https://www.readbyqxmd.com/read/28644149/thermal-transport-in-monolayer-inse
#7
Arun Nissimagoudar, Jinlong Ma, Yani Chen, Wu Li
Two-dimensional InSe, a recently synthesized semiconductor having a moderate band gap, has gained attention due to its ultra high mobility and high photo-responsivity. In this work, we calculate the lattice thermal conductivity (κ) of monolayer InSe by solving the phonon Boltzmann transport equation (BTE) with first-principles calculated inter atomic force constants. κ of monolayer InSe is isotropic and found to be around 27.6 W/m-K at room temperature along the in-plane direction. The size dependence of κ shows the size effect can persist up-to 20 μm...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28644042/a-review-on-recent-applications-of-high-performance-liquid-chromatography-in-metal-determination-and-speciation-analysis
#8
Susheela Rani, Neha Sharma, Ashok Kumar Malik
High performance liquid chromatography has several advantages over the conventional methods due to their operational simplicity. It is a vital tool to determine metal ions having same mass but different electronic configuration, to separate complex mixtures and to resolve ions that may be indistinguishable by mass spectrometry alone. Metal ions play vital role in many biological processes and involved in setting up of many diseases. Therefore the development of simple methods for the detection and quantification of metals in real samples might serve as diagnostic tools for various diseases...
June 23, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28644010/atomic-layer-deposition-of-indium-gallium-oxide-thin-film-for-thin-film-transistor-applications
#9
Jiazhen Sheng, Eun Jung Park, Bonggeun Shong, Jin-Seong Park
Indium gallium oxide (IGO) thin films were deposited via atomic layer deposition (ALD) using [1,1,1-trimethyl-N-(trimethylsilyl)silanaminato]indium (InCA-1) and trimethylgallium (TMGa) as indium and gallium precursors, respectively, and hydrogen peroxide (H2O2) as the reactant. In order to clearly understand the mechanism of multicomponent ALD growth of oxide semiconductor materials, several variations in the precursor-reactant deposition cycles were evaluated. Gallium could be doped into oxide film at 200°C when accompanied by an InCA-1 pulse, and no growth of gallium oxide was observed without the simultaneous deposition of indium oxide...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28643882/the-history-and-current-status-of-glyphosate
#10
Stephen O Duke
Glyphosate is the only herbicide to target the enzyme 5-enolpyruvyl-3-shikimate phosphate synthase (EPSPS). It is a high use rate, non-selective herbicide that translocates primarily to metabolic sinks, killing meristematic tissues away from the application site. Its phloem-mobile properties and slow action in killing weeds allows the herbicide to move throughout the plant to kill all meristems, making it effective for perennial weed control. Since commercialization in 1974, its use has grown to dominate the herbicide market...
June 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28641675/the-application-of-solar-cells-in-the-electrokinetic-remediation-of-metal-contaminated-sediments
#11
Natasa S Varga, Bozo D Dalmacija, Miljana Dj Prica, Djurdja V Kerkez, Milena Dj Becelic-Tomin, Jelena M Spasojevic, Dejan S Krcmar
  In this study, solar cells were used to generate an electric field for the electrokinetic remediation of metal contaminated sediment (Nickel, Cadmium, Zinc). For determination of metals mobility, bioavailability and potential toxicity, sequential extraction procedure, simultaneously extracted metals (SEM) and acid-volatile sulphide ratios (AVS) were performed before, during and after treatment.After 21 days of treatment, 63% Ni, 82% Cd and 58% Zn was removed from the anode region. The application of the electric field changed the chemical composition of the sediments...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28641609/a-systematic-review-of-the-psychometric-properties-usability-and-clinical-impacts-of-mobile-mood-monitoring-applications-in-young-people
#12
M Dubad, C Winsper, C Meyer, M Livanou, S Marwaha
BACKGROUND: Mobile mood-monitoring applications are increasingly used by mental health providers, widely advocated within research, and a potentially effective method to engage young people. However, little is known about their efficacy and usability in young populations. METHOD: A systematic review addressing three research questions focused on young people: (1) what are the psychometric properties of mobile mood-monitoring applications; (2) what is their usability; and (3) what are their positive and negative clinical impacts? Findings were synthesised narratively, study quality assessed and compared with evidence from adult studies...
June 23, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28641422/structure-and-mobility-of-water-confined-in-alpo4-54-nanotubes
#13
Cristina Gavazzoni, Nicolas Giovambattista, Paulo A Netz, Marcia C Barbosa
We performed molecular dynamics simulations of water confined within AlPO4-54 nanotubes. AlPO4-54 is an artificial material made of AlO4 and of PO4 in tetrahedra arranged in a periodic structure forming pores of approximately 1.3 nm in diameter. This makes AlPO4-54 an excellent candidate for practical applications, such as for water filtration and desalination. In this work, the structural and dynamical properties of the confined water are analyzed for various temperatures and water loadings. We find that the water structure is controlled by the heterogeneity of the nanopore surface with the water molecules located preferentially next to the surface of oxygens of AlPO4-54; consequently, at very low densities, water forms helicoidal structures in string-like arrangements...
June 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28641252/an-embedded-marked-point-process-framework-for-three-level-object-population-analysis
#14
Csaba Benedek
In this paper we introduce a probabilistic approach for extracting complex hierarchical object structures from digital images used by various vision applications. The proposed framework extends conventional Marked Point Process (MPP) models by (i) admitting object-subobject ensembles in parent-child relationships and (ii) allowing corresponding objects to form coherent object groups, by a Bayesian segmentation of the population. Different from earlier, highly domain specific attempts on MPP generalization, the proposed model is defined at an abstract level, providing clear interfaces for applications in various domains...
June 15, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28641225/investigation-of-dissociation-constants-for-individual-and-total-naphthenic-acids-species-using-ultra-performance-liquid-chromatography-ion-mobility-time-of-flight-mass-spectrometry-analysis
#15
Rongfu Huang, Pamela Chelme-Ayala, Yanyan Zhang, Mohamed Changalov, Mohamed Gamal El-Din
Ultra-performance liquid chromatography ion mobility time-of-flight mass spectrometry (UPLC-IM-TOFMS) was utilized for the analysis of naphthenic acids (NAs) in fractions of pH-dependent sequential liquid-liquid extractions from oil sands process-affected water. Ion-mobility separation technique allowed the differentiation of OyS-NAs (2 ≤ y ≤ 4) from Ox-NAs (2 ≤ x ≤ 5) via drift time versus retention time separations. The results indicated that the addition of S atom to the O2-NA molecule led to a lower increase in the dissociation constant (pKa) compared to that caused by the addition of O atom...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28639401/van-der-waals-epitaxial-growth-of-atomic-layered-hfs2-crystals-for-ultrasensitive-near-infrared-phototransistors
#16
Lei Fu, Feng Wang, Bin Wu, Nian Wu, Wei Huang, Hanlin Wang, Chuanhong Jin, Lin Zhuang, Jun He, Lei Fu, Yunqi Liu
As a member of the group IVB transition metal dichalcogenides (TMDs) family, hafnium disulfide (HfS2 ) is recently predicted to exhibit higher carrier mobility and higher tunneling current density than group VIB (Mo and W) TMDs. However, the synthesis of high-quality HfS2 crystals, sparsely reported, has greatly hindered the development of this new field. Here, a facile strategy for controlled synthesis of high-quality atomic layered HfS2 crystals by van der Waals epitaxy is reported. Density functional theory calculations are applied to elucidate the systematic epitaxial growth process of the S-edge and Hf-edge...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28639331/top-down-integration-of-molybdenum-disulfide-transistors-with-wafer-scale-uniformity-and-layer-controllability
#17
Mao-Lin Shi, Lin Chen, Tian-Bao Zhang, Jing Xu, Hao Zhu, Qing-Qing Sun, David Wei Zhang
The lack of stable and efficient techniques to synthesize high-quality large-area thin films is one of the major bottlenecks for the real-world application of the 2D transition metal dichalcogenides. In this work, the growth of molybdenum disulfide (MoS2 ) on sapphire substrates by sulfurizing the MoO3 film deposited by atomic layer deposition (ALD) is reported. The advantages of the ALD method can be well inherited, and the synthesized MoS2 films exhibit excellent layer controllability, wafer-scale uniformity, and homogeneity...
June 22, 2017: Small
https://www.readbyqxmd.com/read/28638406/an-html5-based-pure-website-solution-for-rapidly-viewing-and-processing-large-scale-3d-medical-volume-reconstruction-on-mobile-internet
#18
Liang Qiao, Xin Chen, Ye Zhang, Jingna Zhang, Yi Wu, Ying Li, Xuemei Mo, Wei Chen, Bing Xie, Mingguo Qiu
This study aimed to propose a pure web-based solution to serve users to access large-scale 3D medical volume anywhere with good user experience and complete details. A novel solution of the Master-Slave interaction mode was proposed, which absorbed advantages of remote volume rendering and surface rendering. On server side, we designed a message-responding mechanism to listen to interactive requests from clients (Slave model) and to guide Master volume rendering. On client side, we used HTML5 to normalize user-interactive behaviors on Slave model and enhance the accuracy of behavior request and user-friendly experience...
2017: International Journal of Telemedicine and Applications
https://www.readbyqxmd.com/read/28637597/effects-of-lower-body-quadrant-neural-mobilization-in-healthy-and-low-back-pain-populations-a-systematic-review-and-meta-analysis
#19
REVIEW
Tiago Neto, Sandro R Freitas, Marta Marques, Luis Gomes, Ricardo Andrade, Raúl Oliveira
BACKGROUND: Neural mobilization (NM) is widely used to assess and treat several neuromuscular disorders. However, information regarding the NM effects targeting the lower body quadrant is scarce. OBJECTIVES: To determine the effects of NM techniques targeting the lower body quadrant in healthy and low back pain (LBP) populations. DESIGN: Systematic review with meta-analysis. METHOD: Randomized controlled trials were included if any form of NM was applied to the lower body quadrant...
February 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28637356/-footsnap-a-new-mobile-application-for-standardizing-diabetic-foot-images
#20
Moi Hoon Yap, Katie E Chatwin, Choon-Ching Ng, Caroline A Abbott, Frank L Bowling, Satyan Rajbhandari, Andrew J M Boulton, Neil D Reeves
BACKGROUND: We describe the development of a new mobile app called "FootSnap," to standardize photographs of diabetic feet and test its reliability on different occasions and between different operators. METHODS: FootSnap was developed by a multidisciplinary team for use with the iPad. The plantar surface of 30 diabetic feet and 30 nondiabetic control feet were imaged using FootSnap on two separate occasions by two different operators. Reproducibility of foot images was determined using the Jaccard similarity index (JSI)...
June 1, 2017: Journal of Diabetes Science and Technology
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