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Chaima Djebbi, Fredj Chaabani, Oriol Font, Ignasi Queralt, Xavier Querol
The present study focuses on the eolian dispersion and dust deposition, of major and trace elements in soils in a semi-arid climate, around an old fluorite (CaF2) and barite (BaSO4) mine, located in Hammam Zriba in Northern Tunisia. Ore deposits from this site contain a high amount of metal sulphides constituting heavy metal pollution in the surrounding environment. Samples of waste from the surface of mine tailings and agricultural topsoil samples in the vicinity of the mine were collected. The soil samples and a control sample from unpolluted area, were taken in the direction of prevailing northwest and west winds...
June 19, 2017: Environmental Research
Isabelle Denry, Ourania-Menti Goudouri, Jeffrey D Harless, E M Hubbard, Julie A Holloway
The purpose of this work was to investigate the effect of strontium partial replacement for calcium on the crystallization behavior, microstructure and solubility of fluorapatite glass-ceramics. Four glass compositions were prepared with increasing amounts of strontium partially replacing calcium. The crystallization behavior was analyzed by differential scanning calorimetry and X-ray diffraction (XRD). The microstructure was investigated by scanning electron microscopy. The chemical solubility was quantified according to ISO standard 10993-14...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Ramiro Barberena, Víctor A Durán, Paula Novellino, Diego Winocur, Anahí Benítez, Augusto Tessone, María N Quiroga, Erik J Marsh, Alejandra Gasco, Valeria Cortegoso, Gustavo Lucero, Carina Llano, Kelly J Knudson
OBJECTIVES: The goal of this article is to assess the scale of human paleomobility and ecological complementarity between the lowlands and highlands in the southern Andes during the last 2,300 years. By providing isotope results for human bone and teeth samples, we assess a hypothesis of "high residential mobility" suggested on the basis of oxygen isotopes from human remains. METHODS: We develop an isotopic assessment of human mobility in a mountain landscape combining strontium and oxygen isotopes...
June 20, 2017: American Journal of Physical Anthropology
Luisa A Scudeller, Elena Mavropoulos, Marcelo N Tanaka, Andrea M Costa, Carolina A C Braga, Elvis O López, Alexandre Mello, Alexandre M Rossi
Insulin-loaded calcium phosphate nanoparticles have been proposed as a potential drug delivery system for the oral treatment of diabetes and to stimulate bone cell proliferation and bone mineralization. The kinetics of insulin incorporation onto hydroxyapatite (HA) and Sr (SrHA)- and Zn (ZnHA)-substituted hydroxyapatite nanoparticles was investigated using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, zeta potential measurements and circular dichroism (CD) spectroscopy...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Joanna Kolmas, Frédéric Velard, Aneta Jaguszewska, Flora Lemaire, Halima Kerdjoudj, Sophie C Gangloff, Agnieszka Kaflak
Hydroxyapatite (HA) enriched with strontium and boron ions was synthesized using two different methods: the precipitation method (Sr,B-HAw) and the dry method (Sr,B-HAd). Additionally, for the sake of comparison, the "pure" unsubstituted HA was prepared together with HAs substituted only with one type of a foreign ion. The obtained materials were subjected to physicochemical analysis with the use of various analytical methods, such as powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), Fourier transform infrared spectroscopy (FT-IR) and solid-state proton nuclear magnetic resonance ((1)H ssNMR)...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Debabrata Mukherjee, Satoru Shirase, Klaus Beckerle, Thomas P Spaniol, Kazushi Mashima, Jun Okuda
Heteroleptic bis(silyl)amides of magnesium and calcium [(L)M{N(SiMe3)2}] [M = Mg, Ca; LH = 1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane; (Me3TACD)H] were previously synthesized from LH and [M{N(SiMe3)2}2]. Strontium bis(silyl)amides [Sr{N(SiMe3)2}2(thf)2] and [Sr{N(SiHMe2)2}2(thf)2/3] reacted with LH to give different types of products, depending on the presence of the β-SiH function. While the former underwent protonolysis to give the amido-bridged dimer [(L)Sr{N(SiMe3)2}]2 (1), the latter gave the adduct [(LH)Sr{N(SiHMe2)2}2] (2) as a stable solid...
June 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Saeid Kargozar, Nasrin Lotfibakhshaiesh, Jafar Ai, Masoud Mozafari, Peiman Brouki Milan, Sepideh Hamzehlou, Mahmoud Barati, Francesco Baino, Robert G Hill, Mohammad Taghi Joghataei
Designing and developing new biomaterials to accelerate bone healing are currently under progress. In this study, we attempted to promote osteogenesis using strontium- and cobalt- substituted bioactive glasses (BGs) seeded with human umbilical cord perivascular cells (HUCPVCs) in a critical size defect in the distal femur of rabbit animal model. The BG particles were successfully synthesized in the form of granules using the melt-derived route. After being isolated, HUCPVCs were expanded and then characterized to use during in vitro and in vivo procedures...
June 14, 2017: Acta Biomaterialia
P Delva, J Lodewyck, S Bilicki, E Bookjans, G Vallet, R Le Targat, P-E Pottie, C Guerlin, F Meynadier, C Le Poncin-Lafitte, O Lopez, A Amy-Klein, W-K Lee, N Quintin, C Lisdat, A Al-Masoudi, S Dörscher, C Grebing, G Grosche, A Kuhl, S Raupach, U Sterr, I R Hill, R Hobson, W Bowden, J Kronjäger, G Marra, A Rolland, F N Baynes, H S Margolis, P Gill
Phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. By searching for a daily variation of the frequency difference between four strontium optical lattice clocks in different locations throughout Europe connected by such links, we improve upon previous tests of time dilation predicted by special relativity. We obtain a constraint on the Robertson-Mansouri-Sexl parameter |α|≲1.1×10^{-8}, quantifying a violation of time dilation, thus improving by a factor of around 2 the best known constraint obtained with Ives-Stilwell type experiments, and by 2 orders of magnitude the best constraint obtained by comparing atomic clocks...
June 2, 2017: Physical Review Letters
Piao He, Le Wu, Jin-Ting Wu, Xin Yin, Michael Gozin, Jian-Guo Zhang
Tetrazolone (5-oxotetrazole) was synthesized by a moderate strategy through three steps (addition, cyclization and catalytic hydrogenation) avoiding the unstable intermediate diazonium, as reported during the previous preparation. Alkali and alkaline earth metal salts with lithium (1), sodium (2), potassium (3), rubidium (4) caesium (5), magnesium (6), calcium (7), strontium (8) and barium (9) were prepared and fully characterized using elemental analysis, IR and NMR spectroscopy, DSC and TG analysis. All metal salts were characterized via single-crystal X-ray diffraction...
June 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Luong H V Thanh, J C Liu
Flotation separation of strontium (Sr) from wastewater via phosphate precipitation was investigated. While 37.33% of Sr precipitated at highly alkaline pH in the absence of PO4(3-), it completely precipitated as Sr3(PO4)2 at a molar ratio ([PO4(3-)]:[Sr(2+)]) of 0.62 at a lower pH value. The presence of Ca(2+) hindered Sr precipitation, yet it could be overcome by increasing the PO4(3-) dose. Sodium dodecyl sulfate (SDS) was a better collector for dispersed air flotation of Sr3(PO4)2 than cetyl trimethyl ammonium bromide, or mixed collector systems of SDS and saponin...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Marcos Maynar, Francisco Llerena, Francisco J Grijota, Javier Alves, María C Robles, Ignacio Bartolomé, Diego Muñoz
BACKGROUND: The aim of this study was to observe the concentrations of trace metals boron, lithium, rubidium, antimony, tin and strontium in the serum of athletes from different modalities and sedentary subjects and the possible influence that different energy sports training modalities can have on their concentration. METHODS: Eighty professional athletes and 31 sedentary males participated in the present survey. All of them were living in Cáceres (Spain). Serum boron, lithium, rubidium, antimony, tin and strontium analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
2017: Journal of the International Society of Sports Nutrition
Xu Cui, Chengcheng Huang, Meng Zhang, Changshun Ruan, Songlin Peng, Li Li, Wenlong Liu, Ting Wang, Bing Li, Wenhai Huang, Mohamed N Rahaman, William W Lu, Haobo Pan
Although poly(methylmethacrylate) (PMMA) cements are widely used in orthopaedics, they have numerous drawbacks. This study aimed to improve their bioactivity and osseointegration by incorporating strontium-containing borate bioactive glass (SrBG) as the reinforcement phase and bioactive filler of PMMA cement. The prepared SrBG/PMMA composite cements showed significantly decreased polymerization temperature when compared with PMMA and retained properties of appropriate setting time and high mechanical strength...
June 2017: Journal of the Royal Society, Interface
Qiuyue Yang, Wei Yuan, Xiangmei Liu, Yufeng Zheng, Zhenduo Cui, Xianjin Yang, Haobo Pan, Shuilin Wu
The biodegradability and good mechanical property of magnesium alloys make them potential biomedical materials. However, their rapid corrosion rate in the human body's environment impairs these advantages and limits their clinical use. In this work, a compact zirconia (ZrO2) nanofilm was fabricated on the surface of a magnesium-strontium (Mg-Sr) alloy by the atomic layer deposition (ALD) method, which can regulate the thickness of the film precisely and thus also control the corrosion rate. Corrosion tests reveal that the ZrO2 film can effectively reduce the corrosion rate of Mg-Sr alloys that is closely related to the thickness of the film...
June 10, 2017: Acta Biomaterialia
Tamás Malina, László Krecsák, Alexander Westerström, Gábor Szemán-Nagy, Gyöngyi Gyémánt, Márta M-Hamvas, Edward G Rowan, Alan L Harvey, David A Warrell, Balázs Pál, Zoltán Rusznák, Gábor Vasas
We have revealed intra-population variability among venom samples from several individual European adders (Vipera berus berus) within a defined population in Eastern Hungary. Individual differences in venom pattern were noticed, both gender-specific and age-related, by one-dimensional electrophoresis. Gelatin zymography demonstrated that these individual venoms have different degradation profiles indicating varying protease activity in the specimens from adders of different ages and genders. Some specimens shared a conserved region of substrate degradation, while others had lower or extremely low protease activity...
June 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
F F Krause, A Rosenauer, J Barthel, J Mayer, K Urban, R E Dunin-Borkowski, H G Brown, B D Forbes, L J Allen
This paper addresses a novel approach to atomic resolution elemental mapping, demonstrating a method that produces elemental maps with a similar resolution to the established method of electron energy-loss spectroscopy in scanning transmission electron microscopy. Dubbed energy-filtered imaging scanning transmission electron microscopy (EFISTEM) this mode of imaging is, by the quantum mechanical principle of reciprocity, equivalent to tilting the probe in energy-filtered transmission electron microscopy (EFTEM) through a cone and incoherently averaging the results...
June 2, 2017: Ultramicroscopy
N Neves, D Linhares, G Costa, C C Ribeiro, M A Barbosa
OBJECTIVES: This systematic review aimed to assess the in vivo and clinical effect of strontium (Sr)-enriched biomaterials in bone formation and/or remodelling. METHODS: A systematic search was performed in Pubmed, followed by a two-step selection process. We included in vivo original studies on Sr-containing biomaterials used for bone support or regeneration, comparing at least two groups that only differ in Sr addition in the experimental group. RESULTS: A total of 572 references were retrieved and 27 were included...
June 2017: Bone & Joint Research
Yanchao Wang, Sheng Wang, Yunwei Zhang, Jian Lv, Yue Chen, Weitao Zheng, Yanming Ma
It has been widely believed that SrO2, a typical alkaline earth metal peroxide, should adopt the tetrahedral CaC2-type structure (space group I4/mmm) at ambient pressure. Here we report a monoclinic structure (space group C2c), as predicted from first-principles swarm structure searching simulations, is energetically more favorable than the CaC2-type structure at ambient pressure and low temperature, while the I4/mmm structure is only stable at high pressure (>20 GPa) or elevated temperature conditions. A key difference between these structures is the distinct orientation of peroxide ions...
June 9, 2017: Inorganic Chemistry
Yajun Du, Kunli Luo, Rahib Hussain
There is an obvious regional longevity phenomenon in China and many longevity counties are located in South China. This study was carried out to find the characteristics of elemental contents of drinking water in longevity areas in South China and the differences to non-longevity areas in China. A total of 128 drinking water samples were collected from longevity areas in South China (n = 40), non-longevity areas in South China (n = 74) and non-longevity areas in North China (n = 14) and 46 parameters of water were determined or calculated...
June 2017: Journal of Water and Health
J Prejac, V Višnjević, A A Skalny, A R Grabeklis, N Mimica, B Momčilović
Strontium (Sr) is a trace element that closely resembles calcium metabolism. At the present time there is no available long-term biological indicator tissue for assessing the human Sr nutritional status. Here we have presented a novel concept on how to assess the Sr nutritional status by studying the frequency distribution properties of hair Sr ((Sr)H) concentration. In this prospective, observational, cross-sectional, and exploratory epidemiological study, we analyzed (Sr)H in 311 apparently healthy adult Croatians (123 men, 188 women)...
July 2017: Journal of Trace Elements in Medicine and Biology
Sheila Moreira Alves, Susana Capistrano Abreu, Jonas Cavalcante Lemos, Francisco Isaac Fernandes Gomes, Shirley Moreira Alves, Danielle Rocha do Val, Raul Sousa Freitas, Karuza Maria Alves Pereira, Vicente de Paulo Teixeira Pinto, Gerly Anne de Castro Brito, Mirna Marques Bezerra, Gerardo Cristino-Filho, Hellíada Vasconcelos Chaves
BACKGROUND: Temporomandibular joint (TMJ) disorders show inflammatory components, heavily impacting on quality of life. Strontium ranelate has previously shown anti-inflammatory and antinociceptive effects on other experimental inflammatory pain models. Thus, we aim to investigate the strontium ranelate efficacy in reducing the zymosan-induced inflammatory hypernociception in the TMJ of rats by evaluating the TNF-α, IL-1β, and hemeoxygenase-1 (HO-1) involvement. METHODS: Wistar rats were treated with strontium ranelate (0...
March 12, 2017: Pharmacological Reports: PR
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