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https://www.readbyqxmd.com/read/28108923/adsorption-of-nickel-ions-by-oleate-modified-magnetic-iron-oxide-nanoparticles
#1
Cécilia Magnet, Claire Lomenech, Charlotte Hurel, Pierre Reilhac, Françoise Giulieri, Anne-Marie Chaze, Jacques Persello, Pavel Kuzhir
In this work, magnetic nanoparticles of iron oxide (MNPs) were synthesized, and then the surface was recovered with an oleate double layer in order to investigate the ability of this material to adsorb nickel ions. First, the solution chemistry of oleate ions was investigated in order to determine the critical micellar concentration (CMC) value and the arrangements of ions above the CMC. Then, the synthesized oleate-modified MNP was characterized (TEM, DLS, XRD, FTIR, zeta potential, magnetometry). Finally, adsorption experiments were carried out as a function of pH and as a function of nickel concentration in 0...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28108412/deciphering-the-mechanistic-insight-into-the-stoichiometric-ratio-dependent-behavior-of-cu-ii-on-bsa-fibrillation
#2
Ajeet Singh, Poulami Datta, Lalit M Pandey
Various metal ions are recently implicated in protein aggregates and are associated with numerous neurodegenerative diseases. In the present work, we have scrutinized the effect of stoichiometric variation of Cu(II) on BSA fibrillation at physiological pH 7.4 through Thioflavin-T dye binding study, residual protein concentration, Fourier Transform Infrared spectroscopy (FTIR), Dynamic Light Scattering (DLS), Atomic Force Microscopy (AFM) and Isothermal Titration Calorimetry (ITC). Fibrillation kinetics was studied through ThT fluorescence, which illustrated dependency on stoichiometric ratio of Cu(II)...
January 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28107380/novel-tools-in-determining-the-physiological-demands-and-nutritional-practices-of-ontario-firerangers-during-fire-deployments
#3
A H Robertson, C Larivière, C R Leduc, Z McGillis, T Eger, A Godwin, M Larivière, S C Dorman
INTRODUCTION: The seasonal profession of wildland fire fighting in Canada requires individuals to work in harsh environmental conditions that are physically demanding. The purpose of this study was to use novel technologies to evaluate the physiological demands and nutritional practices of Canadian FireRangers during fire deployments. METHODS: Participants (n = 21) from a northern Ontario Fire Base volunteered for this study and data collection occurred during the 2014 fire season and included Initial Attack (IA), Project Fire (P), and Fire Base (B) deployments...
2017: PloS One
https://www.readbyqxmd.com/read/28106281/a-re-evaluation-of-petrotox-for-predicting-acute-and-chronic-toxicity-of-petroleum-substances
#4
Aaron D Redman, Thomas F Parkerton, M Leon Paumen, Josh D Butler, Daniel J Letinski, Klass den Haan
PETROTOX was developed to perform aquatic hazard assessment of petroleum substances (PS) based on substance composition. The model relies on the Hydrocarbon Block Method which is widely used for conducting PS risk assessments providing further justification for evaluating model performance. Previous work described this model and provided a preliminary calibration and validation using acute toxicity data for limited PS. The objective of this study is to re-evaluate PETROTOX using expanded data covering both acute and chronic toxicity endpoints on invertebrates, algae, and fish for a wider range of PS...
January 20, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28105478/the-need-for-strategic-development-of-safety-sciences
#5
Francois Busquet, Thomas Hartung
The practice of risk assessment and regulation of substances has largely developed as a patchwork of circumstantial additions to a nowadays more or less shared international toolbox. The dominant drivers from the US and Europe have pursued remarkably different approaches in the use of these tools for regulation, i.e., a more risk-based approach in the US and a more precautionary approach in Europe. We argue that there is need for scientific developments not only for the tools but also for their application, i...
2017: ALTEX
https://www.readbyqxmd.com/read/28104245/assessing-kinematics-and-kinetics-of-functional-electrical-stimulation-rowing
#6
Adina E Draghici, Glen Picard, J Andrew Taylor, Sandra J Shefelbine
Hybrid functional electrical stimulation (FES) rowing has positive effects on cardiovascular fitness, producing significantly greater aerobic power than either upper body or FES exercise alone. However, there is minimal information on the kinematics, kinetics, and mechanical efficiency of FES-rowing in the spinal cord injured (SCI) population. This study examined the biomechanics of FES-rowing to determine how motions, forces, and aerobic demand change with increasing intensity. Six individuals with SCI and six able-bodied subjects performed a progressive aerobic capacity rowing test...
January 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28103705/exploring-the-impact-of-dementia-friendly-ward-environments-on-the-provision-of-care-a-qualitative-thematic-analysis
#7
Joanne Brooke, Joanna Semlyen
Dementia-friendly wards are recent developments to improve care for patients with dementia in acute hospitals. This qualitative study used focus groups to understand the impact of dementia friendly ward environments on nurses experiences of caring for acutely unwell patients with dementia. Qualified nurses and health care assistants working in an acute NHS Trust in England discussed their perceptions and experiences of working in a dementia-friendly ward environment. Four themes developed from the thematic analysis: (1) 'It doesn't look like a hospital': A changed environment, (2) 'More options to provide person-centred care': No one size fits all, (3) 'Before you could not see the patients': A constant nurse presence and (4) 'The ward remains the same': Resistance to change...
January 1, 2017: Dementia
https://www.readbyqxmd.com/read/28102368/novel-electron-phonon-relaxation-pathway-in-graphite-revealed-by-time-resolved-raman-scattering-and-angle-resolved-photoemission-spectroscopy
#8
Jhih-An Yang, Stephen Parham, Daniel Dessau, Dmitry Reznik
Time dynamics of photoexcited electron-hole pairs is important for a number of technologies, in particular solar cells. We combined ultrafast pump-probe Raman scattering and photoemission to directly follow electron-hole excitations as well as the G-phonon in graphite after an excitation by an intense laser pulse. This phonon is known to couple relatively strongly to electrons. Cross-correlating effective electronic and phonon temperatures places new constraints on model-based fits. The accepted two-temperature model predicts that G-phonon population should start to increase as soon as excited electron-hole pairs are created and that the rate of increase should not depend strongly on the pump fluence...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100612/sex-dependent-intestinal-replication-of-an-enteric-virus
#9
Christopher M Robinson, Yao Wang, Julie K Pfeiffer
: Coxsackievirus is an enteric virus that initiates infection in the gastrointestinal tract before disseminating to peripheral tissues to cause disease, but intestinal factors that influence viral replication are understudied. Furthermore, a sex bias for severe sequelae from coxsackievirus infections has been observed in humans. While mouse models mimicking human pathogenesis have been well characterized, many of these experiments use intraperitoneal injection of coxsackievirus to infect mice, bypassing the intestine...
January 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28100186/influenza-epidemic-surveillance-and-prediction-based-on-electronic-health-record-data-from-an-out-of-hours-general-practitioner-cooperative-model-development-and-validation-on-2003-2015-data
#10
Barbara Michiels, Van Kinh Nguyen, Samuel Coenen, Philippe Ryckebosch, Nathalie Bossuyt, Niel Hens
BACKGROUND: Annual influenza epidemics significantly burden health care. Anticipating them allows for timely preparation. The Scientific Institute of Public Health in Belgium (WIV-ISP) monitors the incidence of influenza and influenza-like illnesses (ILIs) and reports on a weekly basis. General practitioners working in out-of-hour cooperatives (OOH GPCs) register diagnoses of ILIs in an instantly accessible electronic health record (EHR) system. This article has two objectives: to explore the possibility of modelling seasonal influenza epidemics using EHR ILI data from the OOH GPC Deurne-Borgerhout, Belgium, and to attempt to develop a model accurately predicting new epidemics to complement the national influenza surveillance by WIV-ISP...
January 18, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28099893/lead-binding-capacity-of-calcium-pectates-with-different-molecular-weight
#11
Maksim Khotimchenko, Ksenia Makarova, Elena Khozhaenko, Valeri Kovalev
Nowadays, heavy metal contamination of environment is considered as a serious threat to public health because of toxicity of these pollutants and the lack of effective materials with metal-binding properties. Some biopolymers such as pectins were proposed for removal of metal ions from industrial water disposals. Chemical structure of pectins is quite variable and substantially affects their metal binding properties. In this work, relationship between molecular weight and Pb(II)-binding capacity of calcium pectates was investigated in a batch sorption system...
January 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28098288/ag-au-bimetallic-nanoclusters-formed-from-a-homogeneous-gas-phase-a-new-thermodynamic-expression-confirmed-by-molecular-dynamics-simulation
#12
H Akbarzadeh, A N Shamkhali, E Mehrjouei
In this work, two probabilistic and thermodynamic limits for formation of a bimetallic nanocluster from a homogeneous gas phase were obtained in order to investigate the related phenomena using molecular dynamics simulation. Therefore, by application of some simple assumptions from thermodynamics and statistical mechanics, a new expression for composition of the nanocluster was derived which depends only on the initial conditions of the system and one adjustable parameter. This expression can be easily fitted to the results of molecular dynamics and can be used as a measure of the thermodynamic contribution in the cluster formation process...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28097387/all-dual-mobility-cups-are-not-the-same
#13
Thierry Aslanian
PURPOSE: Although the natural history of dual mobility has been exclusively borne for 20 years by a single company (due to industrial ownership), the concept has undeniably been very widely popularised with nearly 40 cups on the French market which should be regarded as a weight bearing surface, both broadly and in their own right. However, within the same original idea, these implants are not all identical (design, material, fixation ect.).The aim of this work is to propose a classification of different dual mobility cups by distinguishing between thegeneral characteristics of a conventional cup and those particular to this type of implant...
January 18, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28096340/evolution-of-antibiotic-resistance-is-linked-to-any-genetic-mechanism-affecting-bacterial-duration-of-carriage
#14
Sonja Lehtinen, François Blanquart, Nicholas J Croucher, Paul Turner, Marc Lipsitch, Christophe Fraser
Understanding how changes in antibiotic consumption affect the prevalence of antibiotic resistance in bacterial pathogens is important for public health. In a number of bacterial species, including Streptococcus pneumoniae, the prevalence of resistance has remained relatively stable despite prolonged selection pressure from antibiotics. The evolutionary processes allowing the robust coexistence of antibiotic sensitive and resistant strains are not fully understood. While allelic diversity can be maintained at a locus by direct balancing selection, there is no evidence for such selection acting in the case of resistance...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28095033/detection-of-the-toughest-pedestrian-injury-risk-as-a-smooth-function-of-age
#15
Tobias Niebuhr, Mirko Junge
OBJECTIVE: While it is common to regard age-specific groups (e.g. children, adults, elderly), smooth trends conditional on the age are mainly ignored in the literature. The present study examines the pedestrian injury risk in full-frontal pedestrian to passenger car accidents and incorporates the age -besides the collision speed and the injury severity- as a plug-in parameter. METHODS: Recent work introduced a model for pedestrian injury risk functions using explicit formulae with easily interpretable model parameters...
January 17, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28095002/the-personality-context-of-relational-aggression-a-five-factor-model-profile-analysis
#16
Kathleen W Reardon, Jennifer L Tackett, Don Lynam
Relational aggression (RAgg) is a form of behavior intended to damage the victim's social status or interpersonal relationships through the use of purposeful interpersonal manipulation or social exclusion (Archer & Coyne, 2005). RAgg is impairing, stable, and largely defined by dysfunctional patterns of interpersonal interactions-all of which invokes comparisons to personality and, more specifically, personality pathology. Leveraging research using the Five Factor Model (FFM) in personality disorder (PD) work, the present study aims to understand the personality context of RAgg by applying this FFM profile approach in 2 ways: (a) by compiling a personality profile of RAgg based on a thorough review of the relevant literature and (b) by compiling a personality profile of RAgg based on expert ratings (N = 19)...
January 16, 2017: Personality Disorders
https://www.readbyqxmd.com/read/28094853/high-dose-per-pulse-electron-beam-dosimetry-a-model-to-correct-for-the-ion-recombination-in-the-advanced-markus-ionization-chamber
#17
Kristoffer Petersson, Maud Jaccard, Jean-François Germond, Thierry Buchillier, François Bochud, Jean Bourhis, Marie-Catherine Vozenin, Claude Bailat
PURPOSE: The purpose of this work was to establish an empirical model of the ion recombination in the Advanced Markus ionization chamber for measurements in high dose rate/dose-per-pulse electron beams. In addition, we compared the observed ion recombination to calculations using the standard Boag two-voltage-analysis method, the more general theoretical Boag models, and the semi-empirical general equation presented by Burns and McEwen. METHODS: Two independent methods were used to investigate the ion recombination: 1) Varying the grid tension of the linear accelerator (linac) gun (controls the linac output) and measuring the relative effect the grid tension has on the chamber response at different source-to-surface distances (SSD)...
January 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28093637/exploring-differences-in-adverse-symptom-event-grading-thresholds-between-clinicians-and-patients-in-the-clinical-trial-setting
#18
Thomas M Atkinson, Lauren J Rogak, Narre Heon, Sean J Ryan, Mary Shaw, Liora P Stark, Antonia V Bennett, Ethan Basch, Yuelin Li
PURPOSE: Symptomatic adverse event (AE) monitoring is essential in cancer clinical trials to assess patient safety, as well as inform decisions related to treatment and continued trial participation. As prior research has demonstrated that conventional concordance metrics (e.g., intraclass correlation) may not capture nuanced aspects of the association between clinician and patient-graded AEs, we aimed to characterize differences in AE grading thresholds between doctors (MDs), registered nurses (RNs), and patients using the Bayesian Graded Item Response Model (GRM)...
January 16, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28093433/is-questionnaire-based-sitting-time-inaccurate-and-can-it-be-improved-a-cross-sectional-investigation-using-accelerometer-based-sitting-time
#19
Nidhi Gupta, Caroline Stordal Christiansen, Christiana Hanisch, Hans Bay, Hermann Burr, Andreas Holtermann
OBJECTIVES: To investigate the differences between a questionnaire-based and accelerometer-based sitting time, and develop a model for improving the accuracy of questionnaire-based sitting time for predicting accelerometer-based sitting time. METHODS: 183 workers in a cross-sectional study reported sitting time per day using a single question during the measurement period, and wore 2 Actigraph GT3X+ accelerometers on the thigh and trunk for 1-4 working days to determine their actual sitting time per day using the validated Acti4 software...
January 16, 2017: BMJ Open
https://www.readbyqxmd.com/read/28092635/evaluating-the-accuracy-of-a-three-term-pencil-beam-algorithm-in-heterogeneous-media
#20
J W Chapman, N C Knutson, J D Fontenot, W D Newhauser, K R Hogstrom
The goal of this work was to evaluate the accuracy of our in-house analytical dose calculation code against MCNPX data in heterogeneous phantoms. The analytical model utilizes a pencil beam model based on Fermi-Eyges theory to account for multiple Coulomb scattering and a least-squares fit to Monte Carlo data to account for nonelastic nuclear interactions as well as any remaining, uncharacterized scatter (the 'nuclear halo'). The model characterized dose accurately (up to 1% of maximum dose in broad fields (4  ×  4 cm(2) and 10  ×  10 cm(2)) and up to 0...
February 7, 2017: Physics in Medicine and Biology
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