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Mathew D Anker, Merle Arrowsmith, Rory L Arrowsmith, Michael S Hill, Mary F Mahon
The β-diketiminato magnesium amidoboranes [HC{(Me)CNDipp}2Mg(NMe2BH2NMe2·BH3)] and [HC{(t-Bu)CNDipp}2Mg(NMe2·BH3)] are readily converted to the corresponding derivatives of the [HB(C6F5)3](-) anion by treatment with B(C6F5)3. The bis(borohydride) derivatives of the heaviest alkaline-earth elements, strontium and barium, may be similarly synthesized by reaction of strontium or barium dimethylamidoboranes and B(C6F5)3 and by metathesis reactions of either SrI2 or BaI2 and 2 molar equiv of K(HB(C6F5)3). The strontium and barium compounds have been fully characterized in solution and in the solid state as the respective tris(diethyl ether) and tetrakis(tetrahydrofuran) adducts...
April 27, 2017: Inorganic Chemistry
Tzu-Chiao Wei, Hsin-Ping Wang, Heng-Jui Liu, Dung-Sheng Tsai, Jr-Jian Ke, Chung-Lun Wu, Yu-Peng Yin, Qian Zhan, Gong-Ru Lin, Ying-Hao Chu, Jr-Hau He
Transition metal oxides with a perovskite crystal structure exhibit a variety of physical properties associated with the lattice. Among these materials, strontium ruthenate (SrRuO3) displays unusually strong coupling of charge, spin and lattice degrees of freedom that can give rise to the photostriction, that is, changes in the dimensions of material due to the absorption of light. In this study, we observe a photon-induced strain as high as 1.12% in single domain SrRuO3, which we attribute to a nonequilibrium of phonons that are a result of the strong interaction between the crystalline lattice and electrons excited by light...
April 24, 2017: Nature Communications
Bin Wang, Lailai Yan, Ying Sun, Jingjing Yan, Qun Lu, Jingxu Zhang, Zhiwen Li
The relationship between population intakes of alkaline-earth elements (AEEs) and hypertension risk remains under discussion. Hair AEE concentrations can indicate their intake levels into human body. Thus, we aimed to investigate an association of hair AEE concentrations with hypertension risk, and the potential effect of dietary habit on this association. We recruited 398 housewives [163 subjects with hypertension (case group) and 235 subjects without hypertension (control group)] in Shanxi Province of north China...
April 6, 2017: Chemosphere
D Y Wan, Y L Zhao, Y Cai, T C Asmara, Z Huang, J Q Chen, J Hong, S M Yin, C T Nelson, M R Motapothula, B X Yan, D Xiang, X Chi, H Zheng, W Chen, R Xu, Ariando, A Rusydi, A M Minor, M B H Breese, M Sherburne, M Asta, Q-H Xu, T Venkatesan
Semiconductor compounds are widely used for photocatalytic hydrogen production applications, where photogenerated electron-hole pairs are exploited to induce catalysis. Recently, powders of a metallic oxide (Sr1-xNbO3, 0.03<x<0.20) were reported to show competitive photocatalytic efficiencies under visible light, which was attributed to interband absorption. This discovery expanded the range of materials available for optimized performance as photocatalysts. Here we study epitaxial thin films of SrNbO3+δ and find that their bandgaps are ∼4...
April 19, 2017: Nature Communications
Thaqif El Khassawna, Diaa Eldin S Daghma, Sabine Stoetzel, Seemun Ray, Stefanie Kern, Deeksha Malhan, Volker Alt, Ulrich Thormann, Anja Henß, Marcus Rohnke, Annette Stengel, Fathi Hassan, Stefan Maenz, Klaus D Jandt, Michael Diefenbeck, Matthias Schumacher, Michael Gelinsky, Katrin Susanne Lips, Christian Heiss
Bone histology of decalcified or undecalcified samples depends on the investigation. However, in research each method provides different information to answer the scientific question. Decalcification is the first step after sample fixation and governs what analysis is later feasible on the sections. Besides, decalcification is favored for immunostaining and in situ hybridization. Otherwise, sample decalcification can be damaging to bone biomaterials implants that contains calcium or strontium. On the other hand, after decalcification mineralization cannot be assessed using histology or imaging mass spectrometry...
2017: BioMed Research International
R S Bradley, Y Liu, T L Burnett, X Zhou, S B Lyon, P J Withers, A Gholinia, T Hashimoto, D Graham, S R Gibbon, B Hornberger
An experimental protocol (workflow) has been developed for time-lapse x-ray nanotomography (nano-CT) imaging of environmentally driven morphological changes to materials. Two case studies are presented. First, the leaching of nanoparticle corrosion inhibitor pigment from a polymer coating was followed over 14 days, while in the second case the corrosion damage to an AA2099 aluminium alloy was imaged over 12 hours. The protocol includes several novel aspects relevant to nano-CT with the use of a combination of x-ray absorption and phase contrast data to provide enhanced morphological and composition information, and hence reveal the best information to provide new insights into the changes of different phases over time...
April 17, 2017: Journal of Microscopy
Yannan Shen, P G Kevrekidis, G P Veldes, D J Frantzeskakis, D DiMarzio, X Lan, V Radisic
In the present work, we explore soliton and roguelike wave solutions in the transmission line analog of a nonlinear left-handed metamaterial. The nonlinearity is expressed through a voltage-dependent, symmetric capacitance motivated by recently developed ferroelectric barium strontium titanate thin-film capacitor designs. We develop both the corresponding nonlinear dynamical lattice and its reduction via a multiple scales expansion to a nonlinear Schrödinger (NLS) model for the envelope of a given carrier wave...
March 2017: Physical Review. E
Zhanjun Guo, Bridgette A Barry
A redox-active tyrosine, YZ (Y161 in the D1 polypeptide), is essential in photosystem II (PSII), which conducts photosynthetic oxygen evolution. On each step of the light-driven oxygen evolving reaction, YZ radical is formed by a chlorophyll cation radical. YZ radical is then reduced by a Mn4CaO5 cluster in a proton coupled electron transfer (PCET) reaction. YZ is hydrogen bonded to His190-D1 and to water molecules in a hydrogen-bonding network, involving calcium. This network is sensitive to disruption with ammonia and to removal and replacement of calcium...
April 14, 2017: Journal of Physical Chemistry. B
Elisa Martín-Merino, Consuelo Huerta-Álvarez, Daniel Prieto-Alhambra, Dolores Montero-Corominas
Among 95,057 patients ≥50 years with new anti-osteoporosis medications (AOM) (2001-2013) in primary care, 1-year cessation was 51% (28%-68%), higher in men, smokers, patients with missing lifestyle data, and out normal BMI, and lower in those aged 60-79, with recent fractures or other anti-osteoporotics, suggesting non-severe osteoporosis and less risk awareness. PURPOSE: Low compliance to anti-osteoporosis medications (AOM) has been previously reported. We aimed to estimate 1-year cessation rates of different AOMs as used in Spanish healthcare settings, and to identify associated risk factors...
December 2017: Archives of Osteoporosis
Maria Anastasopoulou, Konstantinos C Vasilopoulos, Dimitrios F Anagnostopoulos, Ioannis Koutselas, Demetrios K Papayannis, Michael A Karakassides
Strontium borophosphate glasses of composition xSrO•(1-x)•[0.68B2O3•0.32P2O5], 0.40 ≤ x ≤ 0.68, have been prepared by fast quenching of high temperature melts and studied using Raman spectroscopy. In order to comprehend and confirm the obtained spectroscopic Raman data, crystalline compounds and glass-ceramics of analogous compositions were also prepared and studied. Also, ab initio molecular electronic structure theory was used to predict and confirm the experimental vibrational spectra The comparison between theoretical and experimental results showed a good overall agreement...
April 11, 2017: Journal of Physical Chemistry. B
Chuandao Wang, Linhua Hu, Kenneth Poeppelmeier, Peter C Stair, Laurence Marks
Uniform, well-dispersed platinum nanoparticles were grown on SrTiO3 nanocuboids via atomic layer deposition (ALD) using (methylcyclopentadienyl)trimethylplatinum (MeCpPt(Me)3) and water. For the first half-cycle of the deposition particles formed through two sequential processes: initial nucleation and growth. The final particle size after a single complete ALD cycle was dependent on the reaction temperature which alters the net Pt deposition per cycle. Additional cycles resulted in further growth of previously formed particles...
May 5, 2017: Nanotechnology
Peng Zang, David Shaw
OBJECTIVES: To evaluate the clinical efficacy of a dentifrice containing 8% strontium acetate in the relief of dentinal hypersensitivity (DH), compared with that of a standard fluoride dentifrice, in a Chinese population. METHODS: This was an eight-week, single-center, randomized, controlled, examiner-blind, parallel-group study in healthy adult volunteers with DH. After an initial acclimatization period, subjects were randomized to receive either a test dentifrice containing 8% strontium acetate with 1040 ppm fluoride as sodium fluoride, or a commercially available regular fluoride dentifrice containing 1400 ppm fluoride as sodium monofluorophosphate with no known anti-sensitivity activity (negative control)...
December 2016: Journal of Clinical Dentistry
Yuka Takahashi, Masahiro Ito
Many bacteria can swim using their flagella, which are filamentous organelles that extend from the cell surface. The flagellar motor is energized by either a proton (H(+)) or sodium ion (Na(+)) as the motive force. MotAB-type stators use protons, whereas MotPS- and PomAB-type stators use Na(+) as the coupling ions. Recently, alkaliphilic Bacillus alcalophilus was shown to use potassium ions (K(+)) and rubidium ions (Rb(+)) for flagellar rotation, and the flagellar motor from Paenibacillus sp. TCA-20 uses divalent cations such as magnesium ions (Mg(2+)), calcium ions (Ca(2+)), and strontium ions (Sr(2+)) for coupling...
2017: Methods in Molecular Biology
Hanh H Nguyen, Frances Milat, Peter R Ebeling
Atypical femoral fractures (AFFs) are a rare association of anti-resorptive therapy for osteoporosis. Limited evidence-based management guidelines on their optimal treatment exist, with observational studies suggesting a role for teriparatide (TPTD) in AFF healing. We report a case of a 65-year-old woman with postmenopausal osteoporosis who sustained an AFF following long-term bisphosphonate therapy, and who subsequently developed a new contralateral AFF after completion of TPTD therapy and initiation of strontium ranelate (SR) treatment...
June 2017: Bone Reports
Bader A Alfarraj, Chet R Bhatt, Fang Yu Yueh, Jagdish P Singh
Laser-induced breakdown spectroscopy (LIBS) is a widely used laser spectroscopic technique in various fields, such as material science, forensic science, biological science, and the chemical and pharmaceutical industries. In most LIBS work, the analysis is performed using radiative transitions from atomic emissions. In this study, the plasma temperature and the product [Formula: see text] (the number density N and the absorption path length [Formula: see text]) were determined to evaluate the optical depths and the self-absorption of Sr and Al lines...
April 2017: Applied Spectroscopy
Gunjan Verma, Chetan Vishwakarma, C V Dharmadhikari, Umakant D Rapol
We report the construction of a simple, light weight, and compact atomic beam spectroscopy cell for strontium atoms. The cell is built using glass blowing technique and includes a simple titanium sublimation pump for the active pumping of residual and background gases to maintain ultra-high vacuum. A commercially available and electrically heated dispenser source is used to generate the beam of Sr atoms. We perform spectroscopy on the 5s(2)S01→5s 5pP11 transition to obtain a well resolved Doppler free spectroscopic signal for frequency stabilization of the laser source...
March 2017: Review of Scientific Instruments
S Hurtado-Bermudez, J L Mas, M Villa-Alfageme
The latest EU Council Regulation 2016/52/Euratom updates the emergency limits on radionuclides in foods including (210)Po and (90)Sr, two of the most important radionuclides for radiological dose from the ingestion pathway. A novel and straightforward method has been developed for sequential determination of (90)Sr and (210)Po in food samples using ultra low-level liquid scintillation counting and alpha-particle spectrometry. For (90)Sr analysis, the method makes use of stable strontium as yield tracer, and (210)Po is determined through self-deposition using (209)Po as a yield tracer...
August 15, 2017: Food Chemistry
Christian Reitz, Di Wang, Daniela Stoeckel, Andre Beck, Thomas Leichtweiß, Horst Hahn, Torsten Brezesinski
Mesostructured non-silicate materials, particularly mixed-metal oxides, are receiving much attention in recent years due to their potential for numerous applications. Via polymer-templating method, perovskite-type lanthanum strontium manganese oxide (La1-xSrxMnO3, LSMO, with x ≈ 0.15 to 0.30) with a continuous 3D cubic network of 23 nm pores is prepared in thin film form for the first time. Characterization results from grazing incidence X-ray scattering, X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and electron microscopy and tomography show that the dip-coated sol-gel-derived films are of high quality in terms of composition and morphology, and that they are stable to over 700 °C...
April 3, 2017: ACS Applied Materials & Interfaces
Chao Zhao, Kunli Luo, Yajun Du, Yuan Tian, Jie Long, Xiaofeng Zhao, Shixi Zhang
The Northern Daba Mountains (NDM) of Shaanxi Province, China, are a well-known selenium (Se)-rich area, and the area is also known for endemic fluorine (F) and arsenic (As) poisoning. In order to study the hydrochemical characteristics and trace element contents of the natural waters of this region, 62 water samples were collected from Lan'gao area in the NDM. The hydrochemical composition was principally characterized by Ca·Mg-HCO3·SO4. F and As concentrations ranged from 0.01 to 0.67 mg/L and from 0.33 to 6...
April 2017: Journal of Water and Health
Che-Yuan Yang, Sudipta Som, Subrata Das, Chung-Hsin Lu
Novel chemical vapor deposition (CVD) process was successfully developed for the growth of Sr2Si5N8:Ce(3+) phosphors with elevated luminescent properties. Metallic strontium was used as a vapor source for producing Sr3N2 vapor to react with Si3N4 powder via a homogeneous gas-solid reaction. The phosphors prepared via the CVD process showed high crystallinity, homogeneous particle size ranging from 8 to 10 μm, and high luminescence properties. In contrast, the phosphors prepared via the conventional solid-state reaction process exhibited relative low crystallinity, non-uniform particle size in the range of 0...
March 31, 2017: Scientific Reports
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