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Xiu-Li Luo, Gang-Ling He, Yue-Ping Fang, Yue-Hua Xu
NiS/g-C3 N4 /SrTiO3 (NS/CN/STO) composites were prepared using a facile hydrothermal method. The synergistic effect of g-C3 N4 /SrTiO3 (CN/STO) heterojunction and NiS cocatalyst enhanced the photocatalytic hydrogen evolution activity of NS/CN/STO. A hydrogen production rate of 1722.7 μmol h-1 g-1 was obtained when the 2%NiS/20%g-C3 N4 /SrTiO3 (2NS/20CN/STO) was used for the photocatalytic hydrogen evolution in the presence of methanol used as a sacrificial agent under UV-vis light irradiation; the photocatalytic hydrogen production rate of 2NS/20CN/STO is 32...
February 13, 2018: Journal of Colloid and Interface Science
Daria Handkiewicz-Junak, Thorsten D Poeppel, Lisa Bodei, Cumali Aktolun, Samer Ezziddin, Francesco Giammarile, Roberto C Delgado-Bolton, Michael Gabriel
The skeleton is the most common metastatic site in patients with advanced cancer. Pain is a major healthcare problem in patients with bone metastases. Bone-seeking radionuclides that selectively accumulate in the bone are used to treat cancer-induced bone pain and to prolong survival in selected groups of cancer patients. The goals of these guidelines are to assist nuclear medicine practitioners in: (a) evaluating patients who might be candidates for radionuclide treatment of bone metastases using beta-emitting radionuclides such as strontium-89 ( 89 Sr), samarium-153 ( 153 Sm) lexidronam ( 153 Sm-EDTMP), and phosphorus-32 ( 32 P) sodium phosphate; (b) performing the treatments; and...
February 16, 2018: European Journal of Nuclear Medicine and Molecular Imaging
Kang Lee, Yeong-Mu Ko, Han-Cheol Choe
In the present study, electrochemical deposition of hydroxyapatite substituted with magnesium and strontium on Ti-6Al-4V alloy have investigated. Mg and Sr-doped HAp was coated using subsequently pulsed electrochemical deposition process at 85 °C in the solution contained Ca, Mg, Sr, and P ion. The morphology of Mg/Sr-HAp formed on implant was investigated using scanning electron microscopy and X-ray diffraction. HAp grain size and XRD intensity decreased with Mg2+ and Sr2+ ions. The initial current density was changed with addition of Mg and Sr ion concentration when the constant voltage was applied to specimens...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Rasika Kulkarni, Deepti Deobagkar, Smita Zinjarde
Mangrove forests prevalent along the intertidal regions of tropical and sub-tropical coastlines are inimitable and dynamic ecosystems. They protect and stabilize coastal areas from deleterious consequences of natural disasters such as hurricanes and tsunamis. Although there are reviews on ecological aspects, industrial uses of mangrove-associated microorganisms and occurrence of pollutants in a region-specific manner, there is no exclusive review detailing the incidence of metals in mangrove sediments and associated biota in these ecosystems on a global level...
February 12, 2018: Ecotoxicology and Environmental Safety
Andrew Sillen, Vincent Balter
The strontium isotopic ratio 87 Sr/ 86 Sr has been studied in the Sterkfontein Valley of South Africa to infer both habitat usage and residence for a number of early hominins. This paper examines the existing 87 Sr/ 86 Sr data collectively derived from three studies of Paranthropus robustus teeth with the aim of exploring whether the dataset as a whole may provide deeper insight into habitat, mobility, and growth for this species. 87 Sr/ 86 Sr from seven Swartkrans Member I third molars varies in a well defined narrow range, and while some canines were consistent with this range, a number of P...
January 2018: Journal of Human Evolution
Tiancheng Lv, Wei Liang, Li Li, Xu Cui, Xiaomou Wei, Haobo Pan, Bing Li
Bone cement materials have some disadvantages, including slow degradation and no biological activity, which greatly weakens their clinical application. Therefore, the search for a multifunctional bioactive bone cement has become urgent. In this study, a novel bone cement sample of calcitonin gene-related peptide (CGRP)/chitosan-strontium (Sr)-calcium phosphate cement (CPC) was developed. The structure and morphology were observed by scanning electron microscope (SEM). The cytotoxicity and proliferation of CGRP/chitosan-Sr-CPC were also measured...
February 15, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Ja Yang Koo, Hyunguk Kwon, Minwoo Ahn, Mingi Choi, Ji-Won Son, Jeong Woo Han, Wonyoung Lee
Strontium segregation at perovskite surfaces deteriorates the oxygen reduction reaction kinetics of cathodes and therefore the long-term stability of solid oxide fuel cells (SOFCs). For the systematic and quantitative assessment of the elastic energy in perovskite oxides, which is known to be one of the main origins for dopant segregation, we report the fractional free volume as a new descriptor for the elastic energy in the perovskite oxide system. To verify the fractional free volume model, three samples were prepared with different A-site dopants: La0...
February 14, 2018: ACS Applied Materials & Interfaces
R Jayasree, K Madhumathi, Deepti Rana, Murugan Ramalingam, Rakesh P Nankar, Mukesh Doble, T S Sampath Kumar
Carbonated apatite has a chemical composition quite similar to biological apatite found in native bone. The incorporation of carbonate (CO2-3) ions groups into the apatitic crystal structure can tailor its crystallinity, solubility and biological activity that benefit the bone repair and regeneration. In this study, we report a simple and elegant method of synthesizing carbonated calcium deficient hydroxyapatite (ECCDHA) nanoparticles from egg shell wastes and its efficacy has been compared with synthetic calcium deficient hydroxyapatite (SCDHA) nanoparticles...
April 1, 2018: Journal of Nanoscience and Nanotechnology
V Jeseentharani, B Jeyaraj, A Dayalan, K S Nagaraja
The nanocrystalline strontium cobalt molybdate composites of Sr1-xCoxMoO4 (x = 0, 0.3, 0.5, 0.7, 1) were prepared by mixing various mole ratios (SrM-1, SrCM-2, SrCM-3, SrCM-4 and CoM-5) and investigated for their humidity sensing properties. The composites were characterized by thermal analysis (TG/DTA), X-ray powder diffraction (XRD), Fourier Transform-Infrared spectroscopy (FT-IR), Fourier Transform Raman (FT-Raman) spectroscopy, Scanning Electron Microscopy (SEM/EDAX), Transmission Electron Microscopy (TEM) and UV-Visible absorption spectroscopy...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Yong Huang, Xue Shen, Haixia Qiao, Hao Yang, Xuejiao Zhang, Yiyao Liu, Hejie Yang
Background: Two frequent problems associated with titanium (Ti) surfaces of bone/dental implants are their corrosion and lack of native tissue integration. Methods: Here, we present an anodization-hydrothermal method for coating Ti surfaces with a layer of silicon (Si)- and strontium (Sr)-loaded titania nanotubes (TNs). The Ti surfaces coated with such a layer (Si-Sr-TNs) were characterized with different techniques. Results: The results indicate that the Si 4+ and Sr 2+ ions were evenly incorporated into the TNs and that the Si-Sr-TN layer provides good protection against corrosive media like simulated body fluid...
2018: International Journal of Nanomedicine
M N Müller, A Krabbenhöft, H Vollstaedt, F P Brandini, A Eisenhauer
Marine calcifying eukaryotic phytoplankton (coccolithophores) is a major contributor to the pelagic production of CaCO3 and plays an important role in the biogeochemical cycles of C, Ca and other divalent cations present in the crystal structure of calcite. The geochemical signature of coccolithophore calcite is used as palaeoproxy to reconstruct past environmental conditions and to understand the underlying physiological mechanisms (vital effects) and precipitation kinetics. Here, we present the stable Sr isotope fractionation between seawater and calcite (Δ88/86 Sr) of laboratory cultured coccolithophores in individual dependence of temperature and seawater carbonate chemistry...
February 12, 2018: Geobiology
Vincent Offermanns, Ole Z Andersen, Gregor Riede, Michael Sillassen, Christian S Jeppesen, Klaus P Almtoft, Heribert Talasz, Caroline Öhman-Magi, Bernd Lethaus, Rene Tolba, Frank Kloss, Morten Foss
Numerous in vivo, in vitro and clinical studies report on beneficial effects of strontium with respect to increased bone growth. Based on this knowledge the aim of this study was to evaluate early and late osseointegration stages of functionalized titanium implants showing sustained release of strontium (Sr) and further investigate its potential systemic effect. Strontium functionalized (Ti-Sr-O) and Grade 4 (Control) titanium implants were inserted in the femoral condyle of New Zealand White rabbits. The Ti-Sr-O coating was characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDX) for structure, coating thickness and chemical composition...
February 6, 2018: Acta Biomaterialia
Chen Li, Noel W Solomons, Marilyn E Scott, Kristine G Koski
The possibility that either subclinical mastitis (SCM), an inflammatory condition of the breast, or elevations in breast milk proinflammatory cytokines alter breast milk mineral and trace element composition in humans has not been investigated. In this cross-sectional study, breast milk samples (n=108) were collected from Guatemalan Mam-Mayan mothers at one of three stages of lactation (transitional, early and established), and categorized as SCM (Na:K >0.6) or non-SCM (Na:K ≤0.6). Milk concentrations of 12 minerals (calcium, copper, iron, magnesium, manganese, phosphorus, potassium, rubidium, selenium, sodium, strontium, and zinc) and 4 proinflammatory cytokines (IL-1β, IL-6, IL-8, TNF-α) were measured by inductively coupled plasma mass spectrometry (ICP-MS), Lachat analyzer or Luminex multiplex bead cytokine assay...
March 2018: Journal of Trace Elements in Medicine and Biology
Sven Wach, Katrin Weigelt, Bernhard Michalke, Verena Lieb, Robert Stoehr, Bastian Keck, Arndt Hartmann, Bernd Wullich, Helge Taubert, Anwar Chaudhri
Major and trace elements may play a role in the diagnosis of diseases. In this study, we investigated the concentration of 26 major and trace elements in the serum by inductively coupled plasma (ICP) - optical emission spectrometry (OES) and ICP-sector field-mass spectrometry (sf-MS). We analyzed the serum from a discovery cohort of 6 bladder cancer (BCa) patients and 12 healthy controls as well as from a validation cohort of 21 BCa patients, 29 non-tumor bladder patients (with acute and chronic inflammation) and 18 healthy controls...
March 2018: Journal of Trace Elements in Medicine and Biology
Debabrata Mukherjee, Thomas Höllerhage, Valeri Leich, Thomas P Spaniol, Ulli Englert, Laurent Maron, Jun Okuda
The molecular strontium hydride complex [(Me3TACD)3Sr3(μ3-H)2][SiPh3] (2) was isolated in 69% yield as dark red crystals of the benzene solvate 2•C6H6 from the reaction of [Sr(SiPh3)2(thf)3] (1') with (Me3TACD)H (1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane). This transformation can be considered a redox process with the Brønsted acidic amine proton in (Me3TACD)H acting as the hydride source. Trace amounts of water gave 2 co-crystallized with [(Me3TACD)3Sr3(μ3-H)(μ3-OH)]¬[SiPh3] (2*). Substitutional disorder of a bridging hydride by a hydroxide was detected because the bulky Me3TACD ligands efficiently shield the Sr3H2 fragment in 2...
February 7, 2018: Journal of the American Chemical Society
Panagiotis Anagnostis, Stavroula A Paschou, Nifon N Gkekas, Aikaterini-Maria Artzouchaltzi, Konstantinos Christou, Dimitrios Stogiannou, Andromachi Vryonidou, Michael Potoupnis, Dimitrios G Goulis
PURPOSE: Both type 1 (T1DM) and type 2 diabetes mellitus (T2DM) have been associated with bone fragility and increased fracture risk. However, little is known regarding the effect of anti-osteoporotic treatment on bone mineral density (BMD) and/or fracture risk in these patients. We aimed to systematically investigate the efficacy of anti-osteoporotic medications in patients with diabetes in comparison with non-diabetic subjects. METHODS: MEDLINE and Scopus databases were searched (up to 31st October 2017)...
February 6, 2018: Endocrine
M du Preez, R Nel, H Bouwman
Bio-monitoring of pollutants in long-lived animals such as sea turtles is an important tool in ecotoxicology. We present the first report on metallic elements in sea turtle eggs from the Indian Ocean. Eggs of the leatherback and loggerhead turtle that breed on the Indian Ocean coast of South Africa were analysed for 30 elements. The eggshells and egg contents of the loggerhead turtle, the smaller of the two species, had higher or significantly higher concentrations than leatherbacks, except for strontium - the reason is unknown...
February 2, 2018: Chemosphere
Zi Ye, Valentina Prigiobbe
Hydraulic fracturing (or fracking) is a well stimulation technique used to extract resources from a low permeability formation. Currently, the most common application of fracking is for the extraction of oil and gas from shale. During the operation, a large volume of brine, rich in hazardous chemicals, is produced. Spills of brine from wells or pits might negatively impact underground water resources and, in particular, one of the major concerns is the migration of radionuclides, such as radium (Ra2+), into the shallow subsurface...
February 2, 2018: Journal of Contaminant Hydrology
B Wang, K Switowski, C Cojocaru, V Roppo, Y Sheng, M Scalora, J Kisielewski, D Pawlak, R Vilaseca, H Akhouayri, W Krolikowski, J Trull
We present an indirect, non-destructive optical method for domain statistic characterization in disordered nonlinear crystals having homogeneous refractive index and spatially random distribution of ferroelectric domains. This method relies on the analysis of the wave-dependent spatial distribution of the second harmonic, in the plane perpendicular to the optical axis in combination with numerical simulations. We apply this technique to the characterization of two different media, Calcium Barium Niobate and Strontium Barium Niobate, with drastically different statistical distributions of ferroelectric domains...
January 22, 2018: Optics Express
Guoping Lin, Rémi Henriet, Aurélien Coillet, Maxime Jacquot, Luca Furfaro, Gilles Cibiel, Laurent Larger, Yanne K Chembo
We present an experimental study of the variation of quality factor (Q-factor) of WGM resonators as a function of surface roughness. We consider mm-size whispering-gallery mode resonators manufactured with fluoride crystals, featuring Q-factors of the order of 1 billion at 1550 nm. The experimental procedure consists of repeated polishing steps, after which the surface roughness is evaluated using profilometry by white-light phase-shifting interferometry, while the Q-factors are determined using the cavity-ring-down method...
February 1, 2018: Optics Letters
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