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https://www.readbyqxmd.com/read/28535064/ten-fold-enhancement-of-inas-nanowire-photoluminescence-emission-with-an-inp-passivation-layer
#1
Pamela Jurczak, Yunyan Zhang, Jiang Wu, Ana M Sanchez, Martin Aagesen, Huiyun Liu
In this letter, we demonstrate that a significant improvement of optical performance of InAs nanowires can be achieved by capping the core InAs nanowires with a thin InP shell, which successfully passivates the surface states reducing the rate of non-radiative recombination. The improvements have been confirmed by detailed photoluminescence measurements, which showed up to ten-fold increase in the intensity of room-temperature photoluminescence from the capped InAs/InP nanowires compared to the sample with core-only InAs nanowires...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534286/development-of-a-novel-resin-based-dental-material-with-dual-biocidal-modes-and-sustained-release-of-ag-ions-based-on-photocurable-core-shell-agbr-cationic-polymer-nanocomposites
#2
Weiwei Cao, Yu Zhang, Xi Wang, Yinyan Chen, Qiang Li, Xiaodong Xing, Yuhong Xiao, Xuefeng Peng, Zhiwen Ye
Research on the incorporation of cutting-edge nano-antibacterial agent for designing dental materials with potent and long-lasting antibacterial property is demanding and provoking work. In this study, a novel resin-based dental material containing photocurable core-shell AgBr/cationic polymer nanocomposite (AgBr/BHPVP) was designed and developed. The shell of polymerizable cationic polymer not only provided non-releasing antibacterial capability for dental resins, but also had the potential to polymerize with other methacrylate monomers and prevented nanoparticles from aggregating in the resin matrix...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28533406/spatiotemporal-dynamics-of-word-retrieval-in-speech-production-revealed-by-cortical-high-frequency-band-activity
#3
Stephanie K Riès, Rummit K Dhillon, Alex Clarke, David King-Stephens, Kenneth D Laxer, Peter B Weber, Rachel A Kuperman, Kurtis I Auguste, Peter Brunner, Gerwin Schalk, Jack J Lin, Josef Parvizi, Nathan E Crone, Nina F Dronkers, Robert T Knight
Word retrieval is core to language production and relies on complementary processes: the rapid activation of lexical and conceptual representations and word selection, which chooses the correct word among semantically related competitors. Lexical and conceptual activation is measured by semantic priming. In contrast, word selection is indexed by semantic interference and is hampered in semantically homogeneous (HOM) contexts. We examined the spatiotemporal dynamics of these complementary processes in a picture naming task with blocks of semantically heterogeneous (HET) or HOM stimuli...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28529196/the-usage-of-mock-oral-examinations-for-program-improvement
#4
Shari L Meyerson, Stuart Lipnick, Edward Hollinger
OBJECTIVE: Mock oral examinations are often used to prepare residents for the American Board of Surgery certifying examination. Another potential use of these examinations is to identify programmatic weaknesses. Results from a multi-institutional mock oral examination were evaluated to determine if specific areas of weakness within each of the participating programs could be identified to facilitate program development. DESIGN: A mock oral examination was administered annually consisting of 3 examination rooms per resident with 3 cases in each room...
May 18, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28529116/italian-consensus-guidelines-for-the-management-of-hepatitis-b-virus-infections-in-patients-with-rheumatoid-arthritis
#5
Marco Sebastiani, Fabiola Atzeni, Laura Milazzo, Luca Quartuccio, Carlo Scirè, Giovanni Battista Gaeta, Giovanni Lapadula, Orlando Armignacco, Marcello Tavio, Ignazio Olivieri, Pierluigi Meroni, Laura Bazzichi, Walter Grassi, Alessandro Mathieu, Claudio Mastroianni, Evangelista Sagnelli, Teresa Santantonio, Caterina Uberti Foppa, Massimo Puoti, Loredana Sarmati, Paolo Airò, Oscar Massimiliano Epis, Rossana Scrivo, Miriam Gargiulo, Agostino Riva, Andreina Manfredi, Giovanni Ciancio, Gianguglielmo Zehender, Gloria Taliani, Luca Meroni, Salvatore Sollima, Piercarlo Sarzi-Puttini, Massimo Galli
OBJECTIVES: Hepatitis B (HBV) infection, which is prevalent worldwide, is also frequently seen in patients with rheumatoid arthritis (RA). The Italian Society of Rheumatology (SIR) and the Italian Society of Infectious and Tropical Diseases (SIMIT) endorsed a national consensus process to review the available evidence on HBV management in RA patients and to produce practical, hospital-wide recommendations. METHODS: The consensus panel consisted of infectious disease consultants, rheumatologists and epidemiologists and used the criteria of the Oxford Centre for Evidence-based Medicine to assess the quality of the evidence and the strength of their recommendations...
May 18, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/28528907/widespread-biological-response-to-rapid-warming-on-the-antarctic-peninsula
#6
Matthew J Amesbury, Thomas P Roland, Jessica Royles, Dominic A Hodgson, Peter Convey, Howard Griffiths, Dan J Charman
Recent climate change on the Antarctic Peninsula is well documented [1-5], with warming, alongside increases in precipitation, wind strength, and melt season length [1, 6, 7], driving environmental change [8, 9]. However, meteorological records mostly began in the 1950s, and paleoenvironmental datasets that provide a longer-term context to recent climate change are limited in number and often from single sites [7] and/or discontinuous in time [10, 11]. Here we use moss bank cores from a 600-km transect from Green Island (65...
May 17, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28527477/secular-trends-in-anthropometrics-and-physical-fitness-of-young-portuguese-school-aged-children
#7
Aldo Matos Costa, Mário Jorge Costa, António Antunes Reis, Sandra Ferreira, Júlio Martins, Ana Pereira
INTRODUCTION: The purpose of this study was to analyze secular trends in anthropometrics and physical fitness of Portuguese children. MATERIAL AND METHODS: A group of 1819 students (881 boys and 938 girls) between 10 and 11 years old was assessed in their 5th and 6th scholar grade throughout a 20 years' time-frame. ANCOVA models were used to analyze variations in anthropometrics (height, weight and body mass index) and physical fitness (sit and reach, curl-up, horizontal jump and sprint time) across four quinquennials (1993 - 1998; 1998 - 2003; 2003 - 2008; 2008 - 2013)...
February 27, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28521087/assessment-of-electron-propagator-methods-for-the-simulation-of-vibrationally-resolved-valence-and-core-photoionization-spectra
#8
Alberto Baiardi, Lorenzo Paoloni, Vincenzo Barone, Viatcheslav G Zakrzewski, Joseph Vincent Ortiz
The analysis of photoelectron spectra is usually facilitated by quantum mechanical simulations. Due to the recent improvement of experimental techniques, the resolution of experimental spectra is rapidly increasing, and the inclusion of vibrational effects is usually mandatory to obtain a reliable reproduction of the spectra. With the aim of defining a robust computational protocol, a general time-independent formulation to compute different kinds of vibrationally-resolved electronic spectra has been generalized to support also photoelectron spectroscopy...
May 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28515197/models-for-estimating-and-projecting-global-regional-and-national-prevalence-and-disease-burden-of-asthma-protocol-for-a-systematic-review
#9
Mohammad Romel Bhuia, Bright I Nwaru, Christopher J Weir, Aziz Sheikh
INTRODUCTION: Models that have so far been used to estimate and project the prevalence and disease burden of asthma are in most cases inadequately described and irreproducible. We aim systematically to describe and critique the existing models in relation to their strengths, limitations and reproducibility, and to determine the appropriate models for estimating and projecting the prevalence and disease burden of asthma. METHODS: We will search the following electronic databases to identify relevant literature published from 1980 to 2017: Medline, Embase, WHO Library and Information Services and Web of Science Core Collection...
May 17, 2017: BMJ Open
https://www.readbyqxmd.com/read/28514854/a-new-approach-for-the-synthesis-of-nano-zirconia-fortified-microcapsules
#10
Chia-Chen Li, Dzu-How Yu, Shinn-Jen Chang, Jia-Wei Chen
Robust poly(urea-formaldehyde) (PUF) microcapsules with composite shells comprising zirconia (ZrO2) nanopowder incorporated in PUF were fabricated via a novel and facile one-pot synthesis. ZrO2 nanopowder was chosen because it owns one of the highest mechanical strength among ceramics. The nanopowder was pre-dispersed in the core material to combine encapsulation and fortification into a single process. In the core, the well-dispersed nanopowder migrated to the interface, where PUF polymerization took place...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28514452/isotopic-evidence-of-multiple-controls-on-atmospheric-oxidants-over-climate-transitions
#11
Lei Geng, Lee T Murray, Loretta J Mickley, Pu Lin, Qiang Fu, Andrew J Schauer, Becky Alexander
The abundance of tropospheric oxidants, such as ozone (O3) and hydroxyl (OH) and peroxy radicals (HO2 + RO2), determines the lifetimes of reduced trace gases such as methane and the production of particulate matter important for climate and human health. The response of tropospheric oxidants to climate change is poorly constrained owing to large uncertainties in the degree to which processes that influence oxidants may change with climate and owing to a lack of palaeo-records with which to constrain levels of atmospheric oxidants during past climate transitions...
May 17, 2017: Nature
https://www.readbyqxmd.com/read/28513691/conformational-behavior-and-stacking-interactions-of-contorted-polycyclic-aromatics
#12
Yanfei Guan, Matthew L Jones, Alyssa E Miller, Steven E Wheeler
We present a systematic computational analysis of the conformations and stacking interactions of a set of 18 saddle-shaped, contorted polycyclic aromatic compounds at the B97-D3M(BJ)/TZV(2d,2p)//B97-D/TZV(2d,2p) level of theory. These doubly-concave systems offer a means of tuning the strength of stacking interactions through variations in molecular curvature, and understanding the intermolecular non-covalent interactions exhibited by these systems will aid the design of contorted polycyclic systems with precisely defined packing in the solid state...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28505708/decomposition-of-strongly-charged-topological-defects
#13
Samo Kralj, Bryce S Murray, Charles Rosenblatt
We study decomposition of geometrically enforced nematic topological defects bearing relatively large defect strengths m in effectively two-dimensional planar systems. Theoretically, defect cores are analyzed within the mesoscopic Landau-de Gennes approach in terms of the tensor nematic order parameter. We demonstrate a robust tendency of defect decomposition into elementary units where two qualitatively different scenarios imposing total defect strengths on a nematic region are employed. Some theoretical predictions are verified experimentally, where arrays of defects bearing charges m=±1 and even m=±2 are enforced within a plane-parallel nematic cell using an atomic force microscopy scribing method...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28503654/protective-processes-underlying-the-links-between-marital-quality-and-physical-health
#14
Richard B Slatcher, Dominik Schoebi
Although the links between marital quality and physical health are now well established, the psychological processes through which marriage impacts health remain unclear. Additionally, prior research on the links between marriage and health has focused mainly on how negative aspects of relationships (e.g., conflict, hostility) can be damaging to one's physical health. In this article, we describe the strength and strain model of marital quality and health, which provides a roadmap for studying protective factors underlying marriage-health links...
February 2017: Current Opinion in Psychology
https://www.readbyqxmd.com/read/28503541/effects-of-12-week-core-stabilization-exercise-on-the-cobb-angle-and-lumbar-muscle-strength-of-adolescents-with-idiopathic-scoliosis
#15
Kwang-Jun Ko, Seol-Jung Kang
To identify the effects of core stabilization exercise on the Cobb angle and lumbar muscle strength of adolescent patients with idiopathic scoliosis. Subjects in the present study consisted of primary school students who were confirmed to have scoliosis on radiologic examination performed during their visit to the National Fitness Center in Seoul, Korea. Depending on whether they participated in a 12-week core stabilization exercise program, subjects were divided into the exercise (n=14, age 12.71±0.72 years) or control (n=15, age 12...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28503478/the-effects-of-non-thermal-plasma-and-conventional-treatments-on-the-bond-strength-of-fiber-posts-to-resin-cement
#16
Maíra do Prado, Eduardo Moreira da Silva, Juliana das Neves Marques, Caroline Brum Gonzalez, Renata Antoun Simão
OBJECTIVES: This study compared the effect of hexamethyldisiloxane (HMDSO) and ammonia (NH3) plasmas on the bond strength of resin cement to fiber posts with conventional treatments. MATERIALS AND METHODS: Sixty-five fiber posts were divided into 5 groups: Control (no surface treatment); H2O2 (24% hydrogen peroxide for 1 min); Blasting (blasting with aluminum oxide for 30 sec); NH3 (NH3 plasma treatment for 3 min); HMDSO (HMDSO plasma treatment for 15 min). After the treatments, the Ambar adhesive (FGM Dental Products) was applied to the post surface (n = 10)...
May 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28503215/fast-determination-of-structurally-cohesive-subgroups-in-large-networks
#17
Robert S Sinkovits, James Moody, B Tolga Oztan, Douglas R White
Structurally cohesive subgroups are a powerful and mathematically rigorous way to characterize network robustness. Their strength lies in the ability to detect strong connections among vertices that not only have no neighbors in common, but that may be distantly separated in the graph. Unfortunately, identifying cohesive subgroups is a computationally intensive problem, which has limited empirical assessments of cohesion to relatively small graphs of at most a few thousand vertices. We describe here an approach that exploits the properties of cliques, k-cores and vertex separators to iteratively reduce the complexity of the graph to the point where standard algorithms can be used to complete the analysis...
November 2016: Journal of Computational Science
https://www.readbyqxmd.com/read/28502475/cyst-like-osteolytic-formations-in-recombinant-human-bone-morphogenetic-protein-2-rhbmp-2-augments-sheep-spinal-fusion
#18
Hsin Chuan Pan, Soonchul Lee, Kang Ting, Jia Shen, Chenchao Wang, Alan Nguyen, Emily A Berthiaume, Janette N Zara, A Simon Turner, Howard B Seim, Jin Hee Kwak, Xinli Zhang, Chia Soo
Multiple case reports using recombinant human bone morphogenetic protein-2 (rhBMP-2) have reported complications. However, the local adverse effects of rhBMP-2 application are not well documented. In this report we show that, in addition to promoting lumbar spinal fusion through potent osteogenic effects, rhBMP-2 augmentation promotes local cyst-like osteolytic formations in sheep trabecular bones that have undergone anterior lumbar interbody fusion. Three months after operation, conventional computed tomography showed that the trabecular bones of the rhBMP-2 application groups could fuse, whereas no fusion was observed in the control group...
May 11, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28501638/nitrogen-rich-core-shell-magnetic-mesoporous-silica-as-an-effective-adsorbent-for-removal-of-silver-nanoparticles-from-water
#19
Xiaoye Zhang, Yao Zhang, Xiaodan Zhang, Siqi Li, Yuming Huang
The production and increasing use of silver nanoparticles (AgNPs) obviously results in their release into the environment, leading to a risk to the environment due to their toxic effects. Thus, the removal of AgNPs from water is highly needed. Here, we demonstrate that nitrogen rich (∼10% nitrogen content) core-shell magnetic mesoporous silica is a promising adsorbent for the removal of AgNPs. For this, the poly(ethylenimine) functionalized core-shell magnetic mesoporous silica composites (Fe3O4@SiO2-PEI) were prepared, and characterized by TEM, FT-IR, XRD, TG and N2 adsorption-desorption...
May 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28501340/epitendinous-first-repair-of-zone-ii-flexor-digitorum-profundus-results-in-decreased-gliding-resistance
#20
Michael G Galvez, Garet C Comer, Arhana Chattopadhyay, Chao Long, Anthony W Behn, James Chang
PURPOSE: The importance of flexor tendon repair with both core and epitendinous suture placement has been well established. The objective of this study was to determine whether suture placement order affects gliding resistance and bunching in flexor digitorum profundus tendons in a human ex vivo model. METHODS: The flexor digitorum profundus tendons of the index, middle, ring, and little fingers of paired cadaver forearms were tested intact for excursion and mean gliding resistance in flexion and extension across the A2 pulley...
May 11, 2017: Journal of Hand Surgery
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