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https://www.readbyqxmd.com/read/28645037/slip-additive-migration-surface-morphology-and-performance-on-injection-moulded-high-density-polyethylene-closures
#1
Nabeen Dulal, Robert Shanks, Thomas Gengenbach, Harsharn Gill, David Chalmers, Benu Adhikari, Isaac Pardo Martinez
HYPOTHESIS: The amount and distribution of slip agents, erucamide, and behenamide, on the surface of high-density polyethene, is determined by integral characteristics of slip agent structure and polymer morphology. A suite of surface analysis techniques was applied to correlate physicochemical properties with slip-additive migration behaviour and their surface morphology. The migration, surface morphology and physicochemical properties of the slip additives, crystallinity and orientation of polyethene spherulites and interaction between slip additives and high-density polyethene influence the surface characteristics...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28644800/online-combination-of-epid-cherenkov-imaging-for-3d-dosimetry-in-a-liquid-phantom
#2
Petr Bruza, Jacqueline M Andreozzi, David J Gladstone, Lesley A Jarvis, Joerg Rottmann, Brian W Pogue
Online acquisition of Cherenkov and portal imaging data was combined with a reconstruction scheme called EC3D, providing a full 3D dosimetry of megavoltage X-ray beams in a water tank. The methodology was demonstrated and quantified in a single static beam. Furthermore, the dynamics and visualization of the 3D dose reconstruction were demonstrated with a volumetric modulated arc therapy (VMAT) plan for TG-119 C-Shape geometry. The developed algorithm combines depth dose information, provided by Cherenkov images, with the lateral dose distribution, provided by the electronic portal imaging device (EPID)...
June 20, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28644667/nuclear-resonant-surface-diffraction-of-synchrotron-radiation
#3
Kai Schlage, Liudmila Dzemiantsova, Lars Bocklage, Hans-Christian Wille, Matthias Pues, Guido Meier, Ralf Röhlsberger
Nuclear resonant x-ray diffraction in grazing incidence geometry is used to determine the lateral magnetic configuration in a one-dimensional lattice of ferromagnetic nanostripes. During magnetic reversal, strong nuclear superstructure diffraction peaks appear in addition to the electronic ones due to an antiferromagnetic order in the nanostripe lattice. We show that the analysis of the angular distribution together with the time dependence of the resonantly diffracted x rays reveals surface spin structures with very high sensitivity...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644612/suppressing-isomerization-of-phosphine-protected-au9-cluster-by-bond-stiffening-induced-by-a-single-pd-atom-substitution
#4
Seiji Yamazoe, Shota Matsuo, Satoru Muramatsu, Shinjiro Takano, Kiyofumi Nitta, Tatsuya Tsukuda
The fluxional nature of small gold clusters has been exemplified by reversible isomerization between [Au9(PPh3)8](3+) with a crown motif (Au9(C)) and that with a butterfly motif (Au9(B)) induced by association and dissociation with compact counteranions (NO3(-), Cl(-)). However, structural isomerization was suppressed by substitution of the central Au atom of the Au9 core in [Au9(PPh3)8](3+) with a Pd atom: [PdAu8(PPh3)8](2+) with a crown motif (PdAu8(C)) did not isomerize to that with a butterfly motif (PdAu8(B)) upon association with the counteranions...
June 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28643923/micro-anatomical-responses-in-periodontal-complexes-of-mice-to-calibrated-orthodontic-forces-on-the-crown
#5
A Pal, L Chen, L Yang, F Yang, B Meng, A H Jheon, S P Ho
OBJECTIVE: Correlating mechanical forces with quantifiable physical changes in the dentoalveolar complex. SETTING AND SAMPLE POPULATION: Male 6-week C57BL/6 mice (N=3), micro X-ray-computed tomography; post-analysis software to extract physical changes in periodontal ligament (PDL)-space. MATERIALS AND METHODS: Silicone-elastic bands were placed between maxillary molars for 1 week, with the contralateral side as internal control. Average displacements between crowns and roots, and changes in PDL-spaces were evaluated by registering X-ray tomograms of experimental and control hemi-maxillae...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28643834/understanding-the-remarkable-luminescence-enhancement-via-sio2-coating-on-tio2-eu-3-nanofibers
#6
Meiqi Chang, Yanhua Song, Ye Sheng, Jie Chen, Haifeng Zou
TiO2:Eu(3+) nanofibers diameters can be tuned by changing the mixed solvent ratio are synthesized via the electrospinning technique. Concentration quenching phenomena and the relationship of the PL intensity ratio I((5)D0-(7)F2)/I((5)D0-(7)F1) with the Eu doping concentration are discussed. Notably, the luminescence intensity is enhanced by about 7.8 fold by coating SiO2 gel layer on the TiO2:Eu(3+) nanofibers, which is successfully performed via a sol-gel process followed by calcination. Furthermore, these fibers are characterized systematically via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy...
June 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28643780/voltage-controlled-interfacial-magnetism-through-platinum-orbits
#7
Shinji Miwa, Motohiro Suzuki, Masahito Tsujikawa, Kensho Matsuda, Takayuki Nozaki, Kazuhito Tanaka, Takuya Tsukahara, Kohei Nawaoka, Minori Goto, Yoshinori Kotani, Tadakatsu Ohkubo, Frédéric Bonell, Eiiti Tamura, Kazuhiro Hono, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki
Electric fields at interfaces exhibit useful phenomena, such as switching functions in transistors, through electron accumulations and/or electric dipole inductions. We find one potentially unique situation in a metal-dielectric interface in which the electric field is atomically inhomogeneous because of the strong electrostatic screening effect in metals. Such electric fields enable us to access electric quadrupoles of the electron shell. Here we show, by synchrotron X-ray absorption spectroscopy, electric field induction of magnetic dipole moments in a platinum monatomic layer placed on ferromagnetic iron...
June 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28643695/highly-fluorescent-and-superparamagnetic-nanosystem-for-biomedical-applications
#8
Mariana P Cabrera, Paulo E Cabral Filho, Camila M C M Silva, Rita M Oliveira, Carlos F G C Geraldes, M Margarida C A Castro, Benilde F O Costa, Marta S C Henriques, José A Paixão, Luiz B Carvalho, Beate S Santos, Fernando Hallwass, Adriana Fontes, Giovannia A L Pereira
This work reports on highly fluorescent and superparamagnetic bimodal nanoparticles (BNPs) obtained by a simple and efficient method as probes for fluorescence analysis and/or contrast agents for MRI. These promising BNPs with small dimensions (ca. 17 nm) consist of superparamagnetic iron oxide nanoparticles (SPIONs) covalently bound with CdTe quantum dots (ca. 3 nm). The chemical structure of the magnetic part of BNPs is predominantly magnetite, with minor goethite and maghemite contributions, as shown by Mössbauer spectroscopy, which is compatible with the x-ray diffraction data...
July 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28643678/prevalence-of-factors-related-to-vascular-calcifications-in-patients-with-chronic-kidney-disease-on-dialysis
#9
Guillermo Rosa-Diez, Griselda Bratti, Graciela Filannino, Adriana Peñalba, Fabián Otreras, Miriam Ledesma, Martín Ortemberg, Gustavo Laham, Mariana Vásquez-Durand, Soledad Crucelegui, Mariano Forrester, Carlos Musso, Marcelo Orias, Ricardo Heguilen, Carlos Díaz, Ricardo García-Mónaco, Oscar Velan, Hernán Trimarchi
The main aim of the study was to determine the prevalence of vascular calcifications in patients with chronic kidney disease on dialysis in our population assessed by X-ray. The secondary objectives were to determine the cardiovascular risk factors associated with the presence of vascular calcifications and to evaluate the complementary use of the echocardiogram in a cross-sectional, observational, multicentric study. We included patients with chronic kidney disease on dialysis, age =18 years with at least 3 months of renal replacement therapy in 8 dialysis centres in Argentina...
2017: Medicina
https://www.readbyqxmd.com/read/28643279/highly-efficient-biosorptive-removal-of-lead-from-industrial-effluent
#10
Kajal Sao, Madhurima Pandey, Piyush Kant Pandey, Fahmida Khan
This study has been focused on the efficient removal of Pb (II) from contaminated waters by biosorption using plant derived material. Accordingly an indigenous shrub, Tinospora cordifolia has been identified as the most suitable biosorbent. The plant biomass was subjected to optimization of various parameters such as the pH, equilibrium time, dosage, concentration, temperature and the applicable adsorption models. The optimum pH identified was 4.0 with a contact time of 60 min at room temperature (27 ± 2 °C)...
June 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28643272/prevalence-and-risk-factors-for-low-bone-mineral-density-in-ulcerative-colitis
#11
Ram Pratap Singh Bundela, Prachis Ashdhir, Kumar Shwetanshu Narayan, Mukesh Jain, Rupesh Kumar Pokharna, Sandeep Nijhawan
BACKGROUND: Inflammatory bowel disease (IBD) has been associated with increased risk of osteopenia and osteoporosis. Several risk factors contribute to this; however, studies evaluating their association have conflicting results. METHODS: We conducted a cross-sectional study with prospective enrollment of adult ulcerative colitis patients attending the Gastroenterology Department of Sawai Man Singh Hospital, Jaipur Rajasthan between June 2015 and December 2015. Demographic data including age, gender, body mass index (BMI), disease duration, type of disease, prior steroid use and vitamin D levels were recorded and compared with bone mineral density (BMD) using dual-energy X-ray absorptiometry (DEXA)...
June 23, 2017: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/28642879/aortic-arch-calcification-as-a-predictor-of-repeated-arteriovenous-fistula-failure-within-1-year-in-hemodialysis-patients
#12
Yit-Sheung Yap, Kai-Ting Ting, Wen-Che Chi, Cheng-Hao Lin, Yi-Chun Liu, Po-Lin Kuo, Wan-Long Chuang
OBJECTIVES: The aim of the study was to identify the factors associated with repeated arteriovenous fistula (AVF) failure within 1-year, especially the impact of aortic arch calcification (AAC) on patency of AVF. MATERIALS AND METHODS: We retrospectively assessed chest radiography in hemodialysis patients who had undergone initial AVF. The extent of AAC was categorized into four grades (0-3). The association between AAC grade, other clinical variables, and repeated failure of AVF was then analyzed by binary logistic regression analysis...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28642854/measurement-uncertainty-in-spine-bone-mineral-density-by-dual-energy-x-ray-absorptiometry
#13
Ae-Ja Park, Jun-Il Yoo, Jee-Hye Choi, Kyun Shik Chae, Chang Geun Kim, Dal Sik Kim
BACKGROUND: The purpose of this study was to calculate the measurement uncertainty of the process of bone mineral density (BMD) analysis using dual energy X-ray absorptiometry with traceability. METHODS: Between March 2015 and October 2016, among healthy participants in their 20s and 30s, the study included those who had not taken calcium, vitamin D supplements and steroids and were without a history of osteoporosis, osteopenia and diseases related to osteoporosis...
May 2017: Journal of Bone Metabolism
https://www.readbyqxmd.com/read/28642718/irinotecan-induced-gastrointestinal-dysfunction-is-associated-with-enteric-neuropathy-but-increased-numbers-of-cholinergic-myenteric-neurons
#14
Rachel M McQuade, Vanesa Stojanovska, Elizabeth L Donald, Ahmed A Rahman, Dean G Campelj, Raquel Abalo, Emma Rybalka, Joel C Bornstein, Kulmira Nurgali
Gastrointestinal dysfunction is a common side-effect of chemotherapy leading to dose reductions and treatment delays. These side-effects may persist up to 10 years post-treatment. A topoisomerase I inhibitor, irinotecan (IRI), commonly used for the treatment of colorectal cancer, is associated with severe acute and delayed-onset diarrhea. The long-term effects of IRI may be due to damage to enteric neurons innervating the gastrointestinal tract and controlling its functions. Balb/c mice received intraperitoneal injections of IRI (30 mg/kg(-1)) 3 times a week for 14 days, sham-treated mice received sterile water (vehicle) injections...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28642618/physalins-v-ix-16-24-cyclo-13-14-seco-withanolides-from-physalis-angulata-and-their-antiproliferative-and-anti-inflammatory-activities
#15
Cheng-Peng Sun, Chong-Yue Qiu, Feng Zhao, Ning Kang, Li-Xia Chen, Feng Qiu
Five new physalins, including a novel 1,10-seco one, physalin V (1), a tricarboxylic acid cycle one, physalin VIII (5), a rare 11,15-cyclo one, physalin IX (6), and two new ones, physalins VI (2) and VII (4) were isolated from stems and leaves of Physalis angulata together with eleven known analogues (3 and 7-16). Their structures were established by MS, IR, UV, and NMR spectroscopic analysis, together with the X-ray diffraction analysis of neophysalin, physalin P (12), and the structure of physalin D1 (3) has been revised here...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642465/structural-basis-for-biologically-relevant-mechanical-stiffening-of-a-virus-capsid-by-cavity-creating-or-spacefilling-mutations
#16
Pablo Guerra, Alejandro Valbuena, Jordi Querol-Audí, Cristina Silva, Milagros Castellanos, Alicia Rodríguez-Huete, Damià Garriga, Mauricio G Mateu, Nuria Verdaguer
Recent studies reveal that the mechanical properties of virus particles may have been shaped by evolution to facilitate virus survival. Manipulation of the mechanical behavior of virus capsids is leading to a better understanding of viral infection, and to the development of virus-based nanoparticles with improved mechanical properties for nanotechnological applications. In the minute virus of mice (MVM), deleterious mutations around capsid pores involved in infection-related translocation events invariably increased local mechanical stiffness and interfered with pore-associated dynamics...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28641972/equal-primary-fixation-of-resurfacing-stem-but-inferior-cup-fixation%C3%A2-with-anterolateral-vs-posterior-surgical-approach-a-2-year-blinded-randomized-radiostereometric-and-dual-energy-x-ray-absorptiometry-study-of-metal-on-metal-hip-resurfacing-arthroplasty
#17
Mette H Hjorth, Nina D Lorenzen, Kjeld Søballe, Stig S Jakobsen, Maiken Stilling
BACKGROUND: The anterolateral (AntLat) surgical approach may spare the blood supply to the femoral head and improve the accuracy of cup positioning in metal-on-metal hip resurfacing arthroplasty. Thereby, potentially lessen complications such as avascular head necrosis, femoral neck narrowing and fracture, improve implant fixation, and lessen periprosthetic bone mineral density (BMD) loss. METHODS: Between November 2008 and January 2012, a randomized clinical trial was performed at Aarhus University Hospital...
May 25, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28641969/determining-3d-kinematics-of-the-hip-using-video-fluoroscopy-guidelines-for-balancing-radiation-dose-and-registration-accuracy
#18
Fabio D'Isidoro, Patrik Eschle, Thomas Zumbrunn, Christian Sommer, Stephan Scheidegger, Stephen J Ferguson
BACKGROUND: Video fluoroscopy is a technique currently used to retrieve the in vivo three-dimensional kinematics of human joints during activities of daily living. Minimization of the radiation dose absorbed by the subject during the measurement is a priority and has not been thoroughly addressed so far. This issue is critical for the motion analysis of the hip joint, because of the proximity of the gonads. The aims of this study were to determine the x-ray voltage and the irradiation angle that minimize the effective dose and to achieve the best compromise between delivered dose and accuracy in motion retrieval...
May 25, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28641944/effect-of-antimony-oxide-on-the-shielding-properties-of-some-sodium-boro-silicate-glasses
#19
A M Zoulfakar, A M Abdel-Ghany, T Z Abou-Elnasr, A G Mostafa, S M Salem, H H El-Bahnaswy
Some sodium-silicate-boro-antimonate glasses having the molecular composition [(20) Na2O - (20) SiO2 - (60-x) B2O3 - (x) Sb2O3 (where x takes the values 0, 5 … or 20)] have been prepared by the melt quenching method. The melting and annealing temperatures were 1500 and 650K respectively. The amorphous nature of the prepared samples was confirmed by using X-ray diffraction analysis. Both the experimental and empirical density and molar volume values showed gradual increase with increasing Sb2O3 content. The empirical densities showed higher values than those obtained experimentally, while the empirical molar volume values appeared lower than those obtained experimentally, which confirm the amorphous nature and randomness character of the studied samples...
June 19, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28641673/renewable-modified-cellulose-bearing-chelating-schiff-base-for-adsorptive-removal-of-heavy-metal-ions-and-antibacterial-action
#20
R Saravanan, L Ravikumar
  A novel approach toward chemically modified cellulose bearing active chelating Schiff base with hydroxyl group (Cell-Hy) was synthesized. The modified cellulose was examined for its heavy metal ion uptake potential from aqueous solution. The chemical and structural features of the adsorbent were characterized by Fourier transform infrared spectroscopy (FT-IR), solid state 13C-NMR, Scanning Electron Microscopy (SEM), and energy dispersive analysis of X-ray (EDAX) observations. The experimental conditions and adsorption parameters, including pH, initial metal ion concentration, adsorbent dosage, temperature, and contact time were optimized for the removal of Cu(II) and Pb(II) ions...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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