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https://www.readbyqxmd.com/read/29148917/evaluation-of-antibacterial-activity-and-toxic-metal-removal-of-chemically-synthesized-magnetic-iron-oxide-titanium-coated-nanoparticles-and-application-in-bacterial-treatment
#1
Yasser A M Abdulhady, Mona M El-Shazly, Reham F El-Kased
Co-precipitation method was used for preparation of two types of iron oxide nanoparticles coated by titanium dioxide according to divalent salts used. The average size of iron oxide nanoparticles coated by titanium dioxide measured by particle size analyzer, ranged approximately between 20 nm and 100 nm with mean particle size of 60 nm. Characterization of the prepared nanoparticles was done by X-ray diffraction analysis and scanning electron microscope indicating the sole existence of inverse cubic spinel phase of magnetic iron oxide nanoparticles...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29143649/modelling-stunting-in-list-the-effect-of-applying-smoothing-to-linear-growth-data
#2
Simon Cousens, Jamie Perin, Parul Christian, Lee Shu-Fune Wu, Sajid Soofi, Zulfiqar Bhutta, Claudio Lanata, Richard L Guerrant, Aldo A M Lima, Kåre Mølbak, Palle Valentiner-Branth, William Checkley, Robert H Gilman, R Bradley Sack, Robert E Black, Jean Humphrey, Neff Walker
BACKGROUND: The Lives Saved Tool (LiST) is a widely used resource for evidence-based decision-making regarding health program scale-up in low- and middle-income countries. LiST estimates the impact of specified changes in intervention coverage on mortality and stunting among children under 5 years of age. We aimed to improve the estimates of the parameters in LiST that determine the rate at which the effects of interventions to prevent stunting attenuate as children get older. METHODS: We identified datasets with serial measurements of children's lengths or heights and used random effects models and restricted cubic splines to model the growth trajectories of children with at least six serial length/height measurements...
November 7, 2017: BMC Public Health
https://www.readbyqxmd.com/read/29143013/shape-dependent-effective-diffusivity-in-packings-of-hard-cubes-and-cuboids-compared-with-spheres-and-ellipsoids
#3
Magnus Röding
We performed computational screening of effective diffusivity in different configurations of cubes and cuboids compared with spheres and ellipsoids. In total, more than 1500 structures are generated and screened for effective diffusivity. We studied simple cubic and face-centered cubic lattices of spheres and cubes, random configurations of cubes and spheres as a function of volume fraction and polydispersity, and finally random configurations of ellipsoids and cuboids as a function of shape. We found some interesting shape-dependent differences in behavior, elucidating the impact of shape on the targeted design of granular materials...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29143000/parametric-amplification-in-mos2-drum-resonator
#4
Parmeshwar Prasad, Nishta Arora, A K Naik
Parametric amplification is widely used in diverse areas from optics to electronic circuits to enhance low level signals by varying relevant system parameters. Parametric amplification has also been performed in several micro-nano resonators including nano-electromechanical system (NEMS) resonators based on a two-dimensional (2D) material. Here, we report the enhancement of mechanical response in a MoS2 drum resonator using degenerate parametric amplification. We use parametric pumping to modulate the spring constant of the MoS2 resonator and achieve a 10 dB amplitude gain...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29139212/shape-controlled-surface-coating-to-pd-mesoporous-silica-core-shell-nanocatalysts-with-high-catalytic-activity-and-stability
#5
Jie Ying, Christoph Janiak, Yu-Xuan Xiao, Hao Wei, Xiao-Yu Yang, Bao-Lian Su
Cubic Pd nanocrystals with shape-controlled mesoporous silica shells have been theoretically designed and successfully synthesized for investigating the effect of a porous nanoshell on catalytic performance of the core. Cubic Pd@cubic mesoporous silica keeps activity of all facets and shows highest catalytic activity and enhanced reusability in the hydrogenation of nitrobenzene.
November 14, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29138776/photoelectron-spectroscopy-and-density-functional-theory-studies-of-fructose-h2o-n-n-1-5-anionic-clusters
#6
Zhen Zeng, Elliot R Bernstein
Photoelectron spectroscopy (PES) and density functional theory (DFT) based calculations are executed to characterize gas phase, isolated (fructose + (H2O)n)(-) (n = 1-5) anionic species produced using a matrix assisted laser desorption ionization (MALDI) method. Gas phase, isolated (fructose + (H2O)n)(-) (n = 1-5) cluster anions mainly exist as open chain structures with conformational and positional isomers in the present experiments. Some cyclic structures of (fructose + (H2O)n)(-) (n = 3, 4) are apparently present in the experiments and their VDEs can contribute to the lower energy shoulders of PES features observed for (fructose + (H2O)n)(-) (n = 3, 4)...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29137798/experimental-study-on-viscosity-reduction-for-residual-oil-by-ultrasonic
#7
Xintong Huang, Cuihong Zhou, Quanyu Suo, Lanting Zhang, Shihan Wang
Because of characteristics of large density, high viscosity and poor mobility, the processing and transportation of residual oil are difficult and challenging, viscosity reduction of residual oil is of great significance. In this paper, the effects of different placement forms of ultrasonic transducers on the sound pressure distribution of ultrasonic inside a cubic container have been simulated, the characteristics of oil bath heating and ultrasonic viscosity reduction were compared, viscosity reduction rule of residual oil was experimentally analyzed by utilizing Response Surface Method under conditions of changing ultrasonic exposure time, power and action mode, the mechanism of viscosity reduction was studied by applying Fourier transform infrared spectrometer, the viscosity retentivity experiment was carried out at last...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137773/ultrasonic-assisted-synthesis-of-batio3-nanoparticles-at-25%C3%A2-%C3%A2-c-and-atmospheric-pressure
#8
Songkot Utara, Sitchai Hunpratub
Barium titanate (BaTiO3) nanoparticles were successfully synthesized via a sonochemical method (25 kHz) at a constant temperature of 25 °C and atmospheric pressure without a calcination step. Barium hydroxide Ba(OH)2 and diisopropoxytitanium bis(acetylacetonate) (C12H28O6Ti) were used as the starting materials. The effects of the concentration of NaOH used and ultrasonic reaction time were investigated. The phase composition, functional groups and morphology of synthesized powders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Fourier transform Raman spectroscopy (FT-Raman) and transmission electron microscopy (TEM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136369/structure-determination-of-a-water-soluble-144-gold-atom-particle-at-atomic-resolution-by-aberration-corrected-electron-microscopy
#9
Maia Azubel, Ai Leen Koh, Kiichirou Koyasu, Tatsuya Tsukuda, Roger David Kornberg
Structure determination by transmission electron microscopy has revealed the long sought 144-gold atom particle. The structure exhibits deviations from face centered cubic (fcc) packing of the gold atoms, similar to the solution structure of another gold nanoparticle, and in contrast to a previous X-ray crystal structure. Evidence from analytical methods points to a low number of 3-mercaptobenzoic acid ligands covering the surface of the particle.
November 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/29134998/2d-molybdenum-and-vanadium-nitrides-synthesized-by-ammoniation-of-2d-transition-metal-carbides-mxenes
#10
Patrick Urbankowski, Babak Anasori, Kanit Hantanasirisakul, Long Yang, Lihua Zhang, Bernard Haines, Steven J May, Simon J L Billinge, Yury Gogotsi
MXenes are a rapidly growing class of 2D transition metal carbides and nitrides, finding applications in fields ranging from energy storage to electromagnetic interference shielding and transparent conductive coatings. However, while more than 20 carbide MXenes have already been synthesized, Ti4N3 and Ti2N are the only nitride MXenes reported so far. Here by ammoniation of Mo2CTx and V2CTx MXenes at 600 °C, we report on their transformation to 2D metal nitrides. Carbon atoms in the precursor MXenes are replaced with N atoms, resulting from the decomposition of ammonia molecules...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29134804/concurrent-la-and-a-site-vacancy-doping-modulates-the-thermoelectric-response-of-srtio3-experimental-and-computational-evidence
#11
Feridoon Azough, Samuel S Jackson, Dursun Ekren, Robert Freer, Marco Molinari, Stephen R Yeandel, Pooja M Panchmatia, Stephen C Parker, David Hernandez Maldonado, Demie M Kepaptsoglou, Quentin M Ramasse
To help understand the factors controlling the performance of one of the most promising n-type oxide thermoelectrics SrTiO3, we need to explore structural control at the atom level. In Sr1-xLa2x/3TiO3 ceramics (0.0 ≤ x ≤ 0.9), we determined that the thermal conductivity can be reduced and controlled through an interplay of La substitution and A-site vacancies and the formation of a layered structure. The decrease in thermal conductivity with La and A-site vacancy substitution dominates the trend in the overall thermoelectric response...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29133800/interfaces-between-hexagonal-and-cubic-oxides-and-their-structure-alternatives
#12
Hua Zhou, Lijun Wu, Hui-Qiong Wang, Jin-Cheng Zheng, Lihua Zhang, Kim Kisslinger, Yaping Li, Zhiqiang Wang, Hao Cheng, Shanming Ke, Yu Li, Junyong Kang, Yimei Zhu
Multi-layer structure of functional materials often involves the integration of different crystalline phases. The film growth orientation thus frequently exhibits a transformation, owing to multiple possibilities caused by incompatible in-plane structural symmetry. Nevertheless, the detailed mechanism of the transformation has not yet been fully explored. Here we thoroughly probe the heteroepitaxially grown hexagonal zinc oxide (ZnO) films on cubic (001)-magnesium oxide (MgO) substrates using advanced scanning transition electron microscopy, X-ray diffraction and first principles calculations, revealing two distinct interface models of (001) ZnO/(001) MgO and (100) ZnO/(001) MgO...
November 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/29132829/the-lipolytic-degradation-of-highly-structured-cubic-micellar-nanoparticles-of-soy-phosphatidylcholine-and-glycerol-dioleate-by-phospholipase-a2-and-triacylglycerol-lipase
#13
Maria Wadsäter, Justas Barauskas, Fredrik Tiberg, Tommy Nylander
The effects of different lipolytic enzymes on the structure of lipid liquid crystalline nano-particles (LCNP) have been investigated by cryogenic transmission electron microscopy (cryo-TEM) and synchrotron small angle X-ray diffraction (SAXD). Here we used highly structured cubic micellar (Fd3m) nanoparticles of 50/50 (wt%/wt%) soy phosphatidyl choline (SPC)/glycerol dioleate (GDO) as substrate. Two types of lipolytic enzymes were used, phospholipase A2 (PLA2) that catalysis degradation of the phospholipid component, SPC, and porcine pancreatic triacylglycerol lipase (TGL) that facilitate the hydrolysis of the diglyceride, GDO...
November 10, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29131898/association-of-maternal-obesity-with-longitudinal-ultrasonographic-measures-of-fetal-growth-findings-from-the-nichd-fetal-growth-studies-singletons
#14
Cuilin Zhang, Mary L Hediger, Paul S Albert, Jagteshwar Grewal, Anthony Sciscione, William A Grobman, Deborah A Wing, Roger B Newman, Ronald Wapner, Mary E D'Alton, Daniel Skupski, Michael P Nageotte, Angela C Ranzini, John Owen, Edward K Chien, Sabrina Craigo, Sungduk Kim, Katherine L Grantz, Germaine M Buck Louis
Importance: Despite the increasing prevalence of pregravid obesity, systematic evaluation of the association of maternal obesity with fetal growth trajectories is lacking. Objective: To characterize differences in fetal growth trajectories between obese and nonobese pregnant women, and to identify the timing of any observed differences. Design, Setting, and Participants: The Eunice Kennedy Shriver National Institute of Child Health and Human Development Fetal Growth Studies-Singletons study enrolled cohorts of pregnant women at 12 US health care institutions...
November 13, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/29131580/modular-self-assembly-of-protein-cage-lattices-for-multistep-catalysis
#15
Masaki Uchida, Kimberly McCoy, Masafumi Fukuto, Lin Yang, Hideyuki Yoshimura, Heini M Miettinen, Ben LaFrance, Dustin P Patterson, Benjamin Schwarz, Jonathan A Karty, Peter E Prevelige, Byeongdu Lee, Trevor Douglas
The assembly of individual molecules into hierarchical structures is a promising strategy for developing three-dimensional materials with properties arising from interaction between the individual building blocks. Virus capsids are elegant examples of biomolecular nanostructures, which are themselves hierarchically assembled from a limited number of protein subunits. Here we demonstrate the bio-inspired modular construction of materials with two levels of hierarchy; the formation of catalytically active individual virus-like particles (VLPs) through directed self-assembly of capsid subunits with enzyme encapsulation, and the assembly of these VLP building blocks into three-dimensional arrays...
November 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29130128/effect-of-cys-gsh-and-ph-on-mercury-release-from-tibetan-medicine-zuotai-%C3%AE-hgs-and-%C3%AE-hgs-in-artificial-gastrointestinal-juices
#16
Zhiyuan Zheng, Ming Zhang, Yuancan Xiao, Lixin Wei, Cen Li
Zuotai, also named as "gTso thal", a known Tibetan medicinal mixture containing insoluble cubic crystal mercuric sulfide (β-HgS), has been used to treat diseases with long history. The mercury release ratio from Zuotai in gastrointestinal environment is one determinant factor for its bioavailability and biological effect. However, the information is still scarce now. Therefore, the study was designed to investigate the effect of sulfhydryl biomolecules [L-cysteine (Cys) and glutathione (GSH)] and pH on mercury dissociation from Zuotai, β-HgS, and hexagonal crystal mercuric sulfide (α-HgS) in artificial gastrointestinal juices or pure water with a 1:100 solid-liquid ratio...
November 12, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/29130041/long-term-sleep-duration-as-a-risk-factor-for-breast-cancer-evidence-from-a-systematic-review-and-dose-response-meta-analysis
#17
REVIEW
Chunyang Lu, Hao Sun, Jinyu Huang, Songcheng Yin, Wenbin Hou, Junyan Zhang, Yanshi Wang, Yingying Xu, Huimian Xu
Sleep patterns have been associated with the development of cancers, although the association between sleep duration and breast cancer remains controversial. The purpose of our study was to explore the relationship between sleep duration and breast cancer risk. The PubMed and Web of Science databases were searched, and restricted cubic splines were used to explore the dose-response relationship. Data from 415,865 participants were derived from 10 studies. A J-shaped nonlinear trend was found between sleep duration and breast cancer incidence (Pnon-linear = 0...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29128298/cellobiose-dehydrogenase-hosted-in-lipidic-cubic-phase-to-improve-catalytic-activity-and-stability
#18
Valentina Grippo, Su Ma, Roland Ludwig, Lo Gorton, Renata Bilewicz
Lipidic cubic phase systems (LCPs) are excellent carriers for immobilized enzymes due to their biocompatibility and well-defined nanoporous structure. Lipidic cubic phases act as a convenient matrix to incorporate enzymes and hold them in the vicinity of electrode surfaces in their fully active forms. Corynascus thermophilus cellobiose dehydrogenase (CtCDH) was trapped in a monoolein cubic phase, which increased not only its stability, but also its catalytic performance with both enhanced mediated and direct electron transfer with electrodes...
October 13, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29128294/behavioral-depression-is-associated-with-increased-vagally-mediated-heart-rate-variability-in-adult-female-cynomolgus-monkeys-macaca-fascicularis
#19
Marc N Jarczok, Julian Koenig, Carol A Shively, Julian F Thayer
INTRODUCTION: Depressive symptoms (DS) in humans are associated with decreased resting state vagal activity, but sex seems to moderate this association. Recently, in human females DS have been associated with greater or similar cardiac vagal activity compared to men in both, clinical and non-clinical samples. A previously validated animal model of behavioral depression was used in the present study to investigate the association of DS and cardiac vagal activity in non-human primates. METHODS: The root mean square of successive differences between adjacent heart beats (RMSSD) was used as an indicator of vagally-mediated heart rate variability in 24h heart rate recordings collected via telemetry in 42 adult female cynomolgus monkeys (Macaca fascicularis)...
November 8, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29128119/sensitivity-of-water-energy-nexus-to-dam-operation-a-water-energy-productivity-concept
#20
Mohammed Basheer, Nadir Ahmed Elagib
Understanding and modelling the complex nature of interlinkages between water and energy are essential for efficient use of the two resources. Hydropower storage dams represent an interesting example of the water-energy interdependencies since they are often multipurpose. The concept of Water-Energy Productivity (WEP), defined as the amount of energy produced per unit of water lost in the process, is introduced in this study to illustrate the relationship between energy generation and water losses by examining the sensitivity of the Water-Energy Nexus (WEN) to changing dam operation policy...
November 8, 2017: Science of the Total Environment
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