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Liang Qiu, Jundong Feng, Yaodong Dai, Shuquan Chang
As a new-emerging method for strontium disposal, biosorption has shown advantages such as high sorption capacity; low cost. In this study, we investigated the potential of Saccharomyces cerevisiae (S. cerevisiae) in strontium disposal under culture conditions and the effects of irradiation on their biosorption capabilities. We found that S. cerevisiae can survive irradiation and grow. Pre-exposure to irradiation rendered S. cerevisiae resistant to further irradiation. Surprisingly, the pre-exposure to irradiation can increase the biosorption capability of S...
March 17, 2017: Journal of Environmental Radioactivity
Kong Chao, Wang Xuxia, Wang Qianqian, Han Yuanyuan, Zhao Shuya, Zhang Jun
OBJECTIVE: This study investigated the effects of strontium ranelate (SrR) on the rats' palatal suture after rapid maxillary expansion (RME). METHODS: Thirty-six male 6-week-old Wistar rats were randomly divided into three groups: control group (A), expansion only group (B), and expansion plus SrR group (C). Each group comprised 12 rats. Neither expansion nor SrR was given to group A. Each rat in groups B and C was set an orthodontic appliance with an initial expansive force of 1 N...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
Asaf Durakovic
The modern military battlefields are characterized by the use of nonconventional weapons such as encountered in the conflicts of the Gulf War I and Gulf War II. Recent warfare in Iraq, Afghanistan, and the Balkans has introduced radioactive weapons to the modern war zone scenarios. This presents the military medicine with a new area of radioactive warfare with the potential large scale contamination of military and civilian targets with the variety of radioactive isotopes further enhanced by the clandestine use of radioactive materials in the terrorist radioactive warfare...
March 2017: Military Medicine
Lauren A Hughes, Klaus van Benthem
A spark plasma sintering apparatus was used as a novel method for diffusion bonding of two single crystals of strontium titanate to form bicrystals with one twist grain boundary. This apparatus utilizes high uniaxial pressure and a pulsed direct current for rapid consolidation of material. Diffusion bonding of strontium titanate bicrystals without fracture, in a spark plasma sintering apparatus, is possible at high pressures due to the unusual temperature dependent plasticity behavior of strontium titanate...
February 9, 2017: Journal of Visualized Experiments: JoVE
Zhe Nie, Nicolas Finck, Frank Heberling, Tim Prüßmann, Chunli Liu, Johannes Lutzenkirchen
The geochemical behavior of selenium and strontium is critical for the safe disposal of radioactive wastes. Goethite as one of the most thermodynamically stable and commonly occurring natural iron oxy-hydroxides promisingly retains these elements. This work comprehensively studies the adsorption of Se(IV) and Sr(II) on goethite. Starting from electrokinetic measurements, the binary and ternary adsorption systems are investigated and systematically compared via batch experiments, EXAFS analysis and CD-MUSIC modeling...
March 13, 2017: Environmental Science & Technology
David L Haskins, Matthew T Hamilton, Amanda L Jones, John W Finger, Robert B Bringolf, Tracey D Tuberville
Anthropogenic activities such as industrial processes often produce copious amounts of contaminants that have the potential to negatively impact growth, survival, and reproduction of exposed wildlife. Coal combustion residues (CCRs) represent a major source of pollutants globally, resulting in the release of potentially harmful trace elements such as arsenic (As), cadmium (Cd), and selenium (Se) into the environment. In the United States, CCRs are typically stored in aquatic settling basins that may become attractive nuisances to wildlife...
March 8, 2017: Environmental Pollution
Hiroji Uemura, Marco DiBonaventura, Ed Wang, Dianne Athene Ledesma, Kristen Concialdi, Yasuko Aitoku
BACKGROUND: Real-world treatment patterns of bone metastatic castration-resistant prostate cancer (mCRPC) in Japan were examined, focusing on treatment patterns and resource use differences attributed to symptomatic skeletal events (SSEs). METHODS: Urologists (N=176) provided retrospective chart data for patients with mCRPC (N=445) via online surveys. Descriptive analyses and chi-square tests evaluated treatment patterns and their differences by SSE presence; generalized linear mixed models examined healthcare resource utilization differences as a function of SSEs...
March 6, 2017: Expert Review of Pharmacoeconomics & Outcomes Research
Francisco D C Guerra Liberal, Adriana Alexandre S Tavares, João Manuel R S Tavares
PURPOSE: Computational simulation is a simple and practical way to study and to compare a variety of radioisotopes for different medical applications, including the palliative treatment of bone metastases. This study aimed to evaluate and compare cellular effects modelled for different radioisotopes currently in use or under research for treatment of bone metastases using computational methods. METHODS: Computational models were used to estimate the radiation-induced cellular effects (Virtual Cell Radiobiology algorithm) post-irradiation with selected particles emitted by Strontium-89 ((89)Sr), Samarium-153 ((153)Sm), Lutetium-177 ((177)Lu), and Radium-223 ((223)Ra)...
March 3, 2017: International Journal of Radiation Biology
Jiaying Wang, Satyan Choudhary, William L Harrigan, Alfred J Crosby, Kevin R Kittilstved, Stephen S Nonnenmann
Memristors, often comprising an insulating metal oxide film between two metal electrodes (MIM), constitute a class of two-terminal devices that possesses tunable variations in resistance based on the applied bias history. Intense research remains focused on the metal-insulator interface, which serves as the crux of coupled electronic-ionic interactions and dictates the underpinning transport mechanisms at either electrode. Top-down, ultrahigh-vacuum (UVH) deposition approaches for MIM nanostructures yield highly crystalline, heteroepitaxial interfaces but limit the number of electrode configurations due to a fixed bottom electrode...
March 16, 2017: ACS Applied Materials & Interfaces
Chao Xu, Xu-Xia Wang, Ying-Zi Wang, Pan-Pan Yang, Shu-Ya Zhao, Jun Zhang
PURPOSE: To investigate the effects of strontium ranelate on the expression of BMP-2 during rapid maxillary expansion. METHODS: Thirty-six male 6-week- old male Wistar rats were selected. They were randomly divided into 3 groups. Group A was designed as a control group. An expanded application producing 100 g force was fixed between the first and the second molar on both sides of the rats in group B and group C. 600 mg/kg strontium ranelate was given to the rats in group C daily via an orogastric route, while the equal normal saline was given to the rats in group B...
December 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Dandan Hu, Kai Li, Youtao Xie, Houhua Pan, Jun Zhao, Liping Huang, Xuebin Zheng
Both surface topography and chemistry have a significant influence on the biological performance of orthopedic implant coatings. In our study, a surface modification strategy embodying bioactive trace element incorporation and nanotopography construction was employed to enhance the osteogenic activity of calcium silicate (Ca-Si) coatings. We developed strontium-loaded nanolayer on plasma sprayed Ca-Si (CS) coating via hydrothermal treatment which was denoted as Sr-NT-CS. The original CS coating and the CS coating modified with similar nanotopography (NT-CS) were studied in parallel...
March 2017: Journal of Biomaterials Applications
V Ya Shur, V A Shikhova, D O Alikin, V A Lebedev, L I Ivleva, J Dec, D C Lupascu, V V Shvartsman
The stability of ferroelectric domain patterns at the nanoscale has been a topic of much interest for many years. We investigated the relaxation of the polarized state created by application of a local electric field using a conductive tip of a scanning probe microscope for the model uniaxial relaxor system SrxBa1-xNb2O6 (SBN) in its pure and Ce-doped form. The temporal relaxation of the induced PFM contrast was measured at various temperatures. The average value of the induced contrast decreases during heating for all investigated crystals...
December 2017: Scientific Reports
Markus Johannes Kalmutzki, Konstantin Dolabdjian, Nadja Wichtner, Markus Ströbele, Christoph Berthold, Hans-Jürgen Meyer
The low-temperature modification of Sr3(O3C3N3)2 was prepared and assigned as α-SCY after the high-temperature phase (now called β-SCY) and its frequency-doubling properties were reported recently. The crystal structure of α-SCY was solved and refined by single-crystal X-ray diffraction. Both modifications of SCY crystallize in noncentrosymmetric space groups, with the low-temperature phase (α-SCY) adopting the lower symmetry structure (Cc). Atomic positions in α-SCY (Cc) reveal only small deviations in comparison to those in the structure of β-SCY (R3c)...
March 7, 2017: Inorganic Chemistry
Dandan Shi, Xiaoting Liu, Shimin Shan, Haifeng Xu, Bing Yan
Ab initio calculations on low-lying electronic states of strontium hydride cations, SrH(+), have been performed using the internally contracted multi-reference configuration interaction (icMRCI) method with Davidson correction (+Q). Spin-orbit coupling (SOC) effect between the singlet and triplet states of SrH(+) has been investigated for the first time. The potential energy curves (PECs) of a total of 12 Λ-S states, as well as the 23 Ω states generated from the Λ-S states after considering the SOC effect, have been calculated...
February 24, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Cyril Martins, Markus Aichhorn, Silke Biermann
The interplay of spin-orbit coupling and Coulomb correlations has become a hot topic in condensed matter theory and is especially at stake in 4d and 5d transition metal oxides, like iridates or rhodates. Here, we review recent advances in dynamical mean-field theory(DMFT)-based electronic structure calculations for treating such compounds, introducing all necessary implementation details. We also discuss the evaluation of Hubbard interactions in spin-orbit materials. As an example, we perform DMFT calculations on insulating strontium iridate (Sr<sub>2</sub>IrO<sub>4</sub>) and its 4d metallic counterpart strontium rhodate (Sr<sub>2</sub>RhO<sub>4</sub>)...
March 6, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Arend Harms, Mai Khanh Pham, Oxana Blinova, Sandor Tarjan, Hartmut Nies, Iolanda Osvath
The International Atomic Energy Agency organised four proficiency tests between 2012 and 2015 to test the performance of participating laboratories in an analysis of radionuclides in sea water samples. These exercises were initiated to support IAEA Member States in sea water analyses of tritium, strontium-90 and caesium isotopes in relation to the accident at the Fukushima Daiichi nuclear power station, in March 2011, and subsequent contamination of the marine environment.
February 14, 2017: Applied Radiation and Isotopes
Eric Da Silva, Ana Pejovic-Milic
The calibration of <i>in vivo</i> X-ray fluorescence systems of bone strontium quantification, based on <sup>125</sup>I excitation, is dependent on a coherent normalization procedure. Application of this procedure with the use of plaster of Paris (poP) as a phantom material requires the application of a coherent conversion factor (CCF) to make the calibration functions transferable between the phantom material and human bone. In this work we evaluate, with the use of Monte Carlo simulation, the potential benefit of employing a newly developed hydroxyapatite phantom material into the calibration protocol...
March 1, 2017: Physiological Measurement
Alice Courties, Jérémie Sellam, Emmanuel Maheu, Christian Cadet, Yoann Barthe, Fabrice Carrat, Francis Berenbaum
OBJECTIVE: To determine whether cardiometabolic factors are associated with hand osteoarthritis (HOA) symptoms, radiographic severity and progression in a post hoc analysis of the phase III Strontium ranelate Efficacy in Knee OsteoarthrItis triAl (SEKOIA) trial, designed to determine the effect of strontium ranelate on knee osteoarthritis (OA). METHODS: Among the 1683 patients randomised in the SEKOIA study, 869 with radiographic HOA at baseline (rHOA≥2 joints with Kellgren-Lawrence grade ≥2) were included in a cross-sectional analysis...
2017: RMD Open
Natalia Ohon, Roman Stepchuk, Kostiantyn Blazhivskyi, Leonid Vasylechko
Single-phase mixed aluminates-titanates Nd1-x Sr x Al1-x Ti x O3 (x = 0.3 ÷ 0.9) were prepared from stoichiometric amounts of constituent oxides Nd2O3, Al2O3, TiO2 and strontium carbonate SrCO3 by solid-state reaction technique in air at 1773 K. Crystal structure parameters of Nd1-x Sr x Al1-x Ti x O3 were refined by full-profile Rietveld refinement in space groups R [Formula: see text] c (x = 0.3, 0.5, 0.7 and 0.8) and Pm [Formula: see text] m (x = 0.9). Comparison of the obtained structural parameters with the literature data for the end members of the system NdAlO3 and SrTiO3 revealed formation of two kinds of solid solutions Nd1-xSrxAl1-xTixO3 with the cubic and rhombohedral perovskite structure...
December 2017: Nanoscale Research Letters
Bote Zhao, Lei Zhang, Dongxing Zhen, Seonyoung Yoo, Yong Ding, Dongchang Chen, Yu Chen, Qiaobao Zhang, Brian Doyle, Xunhui Xiong, Meilin Liu
Rechargeable metal-air batteries and water splitting are highly competitive options for a sustainable energy future, but their commercialization is hindered by the absence of cost-effective, highly efficient and stable catalysts for the oxygen evolution reaction. Here we report the rational design and synthesis of a double perovskite PrBa0.5Sr0.5Co1.5Fe0.5O5+δ nanofiber as a highly efficient and robust catalyst for the oxygen evolution reaction. Co-doping of strontium and iron into PrBaCo2O5+δ is found to be very effective in enhancing intrinsic activity (normalized by the geometrical surface area, ∼4...
February 27, 2017: Nature Communications
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