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strontium citrate

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https://www.readbyqxmd.com/read/26910208/modeling-elemental-strontium-in-human-bone-based-on-in-vivo-x-ray-fluorescence-measurements-in-osteoporotic-females-self-supplementing-with-strontium-citrate
#1
H Moise, D R Chettle, A Pejović-Milić
An in-house custom I-125 excited in vivo x-ray fluorescence (IVXRF) system was used to perform bone strontium (Sr) measurements in individuals suffering from osteoporosis and/or osteopenia. These individuals, who were self-administering with Sr supplements of their choice, were measured frequently, ranging from weekly to biweekly to monthly, over four years, as part of the Ryerson and McMaster Sr in Bone Research Study. Based on these data collected, data from eight subjects were used to perform kinetic modeling of Sr in human bone...
March 2016: Physiological Measurement
https://www.readbyqxmd.com/read/24434614/monitoring-bone-strontium-intake-in-osteoporotic-females-self-supplementing-with-strontium-citrate-with-a-novel-in-vivo-x-ray-fluorescence-based-diagnostic-tool
#2
Helen Moise, David R Chettle, Ana Pejović-Milić
Ten female volunteers were recruited as part of the Ryerson and McMaster University Strontium (Sr) in Bone Research Study to have their bone Sr levels measured as they self-supplemented with Sr supplements of their choice. Of the ten volunteers, nine were suffering from osteopenia and/or osteoporosis. Non-invasive bone Sr measurements were performed using an in vivo x-ray fluorescence (IVXRF) I-125 based system. Thirty minute measurements were taken at the finger and ankle, representing primarily cortical and trabecular bone, respectively...
April 2014: Bone
https://www.readbyqxmd.com/read/23646784/well-defined-strontium-tungstate-hierarchical-microspheres-synthesis-and-photoluminescence-properties
#3
Guang Jia, Cuimiao Huang, Cuimiao Zhang, Shiwen Ding, Liyong Wang
Uniform and well-dispersed SrWO4 microspheres have been successfully synthesized through a hydrothermal method by using trisodium citrate and SDS as surfactants. XRD and SEM results demonstrate that the as-synthesized SrWO4 particles are high purity well crystallized and exhibit a relatively uniform spherical morphology. The as-obtained SrWO4:Ln3+ (Ln = Tb, Eu, Dy, and Sm) microspheres show intense light emissions with different colors coming from different Ln3+ ions under ultraviolet excitation, which might find potential applications in the fields such as light emitting phosphors, advanced flat panel displays, and light-emitting diodes (LEDs)...
January 2013: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/23018228/effect-of-desensitizing-toothpastes-on-dentin
#4
Shelon Cristina Souza Pinto, Camila Maggi Maia Silveira, Márcia Thaís Pochapski, Gibson Luiz Pilatt, Fábio André Santos
The objective of this study was to analyze the effects of toothbrushing with desensitizing toothpastes on dentin permeability and dentinal tubule occlusion. Fifty rats provided two hundred incisor teeth divided into five groups: DW, brushed with distilled water (control); FT, brushed with fluoride toothpaste; SCT, brushed with strontium chloride toothpaste; PCT, brushed with potassium citrate toothpaste; and PNT, brushed with potassium nitrate toothpaste. Cavities were prepared to expose the dentinal tubules, and the incisor teeth were brushed using the experimental agents...
September 2012: Brazilian Oral Research
https://www.readbyqxmd.com/read/22995463/accumulation-of-bone-strontium-measured-by-in-vivo-xrf-in-rats-supplemented-with-strontium-citrate-and-strontium-ranelate
#5
COMPARATIVE STUDY
Gregory R Wohl, David R Chettle, Ana Pejović-Milić, Cheryl Druchok, Colin E Webber, Jonathan D Adachi, Karen A Beattie
Strontium ranelate is an approved pharmacotherapy for osteoporosis in Europe and Australia, but not in Canada or the United States. Strontium citrate, an alternative strontium salt, however, is available for purchase over-the-counter as a nutritional supplement. The effects of strontium citrate on bone are largely unknown. The study's objectives were 1) to quantify bone strontium accumulation in female Sprague Dawley rats administered strontium citrate (N=7) and compare these levels to rats administered strontium ranelate (N=6) and vehicle (N=6) over 8 weeks, and 2) to verify an in vivo X-ray fluorescence spectroscopy (XRF) system for measurement of bone strontium in the rat...
January 2013: Bone
https://www.readbyqxmd.com/read/22791570/ethylene-production-by-odhe-in-catalytically-modified-ba-0-5-sr-0-5-co-0-8-fe-0-2-o-3-%C3%AE-membrane-reactors
#6
M Pilar Lobera, Sonia Escolástico, Julio Garcia-Fayos, José M Serra
Process intensification by the integration of membranes and high-temperature reactors offers several advantages with regard to conventional process schemes, that is, energy saving, safe operation, reduced plant/unit size, and higher process performance, for example, higher productivity, catalytic activity, selectivity, or stability. We present the study of oxidative dehydrogenation of ethane at 850 °C on a catalytic membrane reactor based on a mixed ionic-electronic conducting membrane. The surface of the membrane made of Ba(0...
August 2012: ChemSusChem
https://www.readbyqxmd.com/read/22732245/up-regulation-of-a-magnesium-transporter-gene-osmgt1-is-required-for-conferring-aluminum-tolerance-in-rice
#7
Zhi Chang Chen, Naoki Yamaji, Ritsuko Motoyama, Yoshiaki Nagamura, Jian Feng Ma
Magnesium (Mg)-mediated alleviation of aluminum (Al) toxicity has been observed in a number of plant species, but the mechanisms underlying the alleviation are still poorly understood. When a putative rice (Oryza sativa) Mg transporter gene, Oryza sativa MAGNESIUM TRANSPORTER1 (OsMGT1), was knocked out, the tolerance to Al, but not to cadmium and lanthanum, was decreased. However, this inhibition could be rescued by addition of 10 μm Mg, but not by the same concentration of barium or strontium. OsMGT1 was expressed in both the roots and shoots in the absence of Al, but the expression only in the roots was rapidly up-regulated by Al...
August 2012: Plant Physiology
https://www.readbyqxmd.com/read/22549020/monitoring-bone-strontium-levels-of-an-osteoporotic-subject-due-to-self-administration-of-strontium-citrate-with-a-novel-diagnostic-tool-in-vivo-xrf-a-case-study
#8
H Moise, J D Adachi, D R Chettle, A Pejović-Milić
A previously developed in vivo X-ray fluorescence (IVXRF) I-125 based system was used to measure bone strontium levels non-invasively in an osteoporotic female volunteer. The volunteer was recruited in December 2008, as part of the Ryerson and McMaster University Strontium in Bone Research Study and measured at twice weekly, weekly and monthly intervals. Thirty minute measurements were taken at the finger and ankle bone sites, representing primarily cortical and trabecular bone, respectively and the strontium K-alpha X-ray peak at 14...
July 2012: Bone
https://www.readbyqxmd.com/read/21405146/calcium-citrate-and-vitamin-d-in-the-treatment-of-osteoporosis
#9
REVIEW
José Manuel Quesada Gómez, Josep Blanch Rubió, Manuel Díaz Curiel, Adolfo Díez Pérez
The combination of calcium with vitamin D (vitamin D(3) [colecalciferol]) forms the basis of preventive and therapeutic regimens for osteoporosis. A number of studies have suggested that the combination of calcium and vitamin D is effective when administered at respective dosages of at least 1200 mg and 800 IU per day, although efficacy is, as expected, affected by patient compliance. Overall, treatment with this combination appears to be effective in reducing the incidence of non-vertebral and hip fractures...
2011: Clinical Drug Investigation
https://www.readbyqxmd.com/read/20936226/functionalization-of-manganite-nanoparticles-and-their-interaction-with-biologically-relevant-small-ligands-picosecond-time-resolved-fret-studies
#10
Anupam Giri, Abhinandan Makhal, Barnali Ghosh, A K Raychaudhuri, Samir Kumar Pal
We report molecular functionalization of the promising manganite nanoparticles La0.67Sr0.33MnO3 (LSMO) for their solubilization in aqueous environments. The functionalization of individual NPs with the biocompatible citrate ligand, as confirmed by Fourier transform infrared (FTIR) spectroscopy, reveals that citrates are covalently attached to the surface of the NPs. UV-VIS spectroscopic studies on the citrate functionalized NPs reveals an optical band in the visible region. Uniform size selectivity (2.6 nm) of the functionalization process is confirmed from high resolution transmission electron microscope (HRTEM)...
December 2010: Nanoscale
https://www.readbyqxmd.com/read/20874492/dietary-strontium-increases-bone-mineral-density-in-intact-zebrafish-danio-rerio-a-potential-model-system-for-bone-research
#11
Anthony J Siccardi, Steve Padgett-Vasquez, Heath W Garris, Tim R Nagy, Louis R D'Abramo, Stephen A Watts
Zebrafish (Danio rerio) skeletal bone possesses properties similar to human bone, which suggests that they may be used as a model to study mineralization characteristics of the human Haversian system, as well as human bone diseases. One prerequisite for the use of zebrafish as an alternative osteoporotic bone model is to determine whether their bone displays functional plasticity similar to that observed in other bone models. Strontium citrate was supplemented into a laboratory-prepared diet (45% crude protein) to produce dietary strontium levels of 0%, 0...
September 2010: Zebrafish
https://www.readbyqxmd.com/read/20145397/preventive-effect-of-commercial-desensitizing-toothpastes-on-bovine-enamel-erosion-in-vitro
#12
COMPARATIVE STUDY
M T Kato, M Lancia, S H C Sales-Peres, M A R Buzalaf
This study evaluated in vitro commercial desensitizing toothpastes with respect to the prevention of erosion and explored the effect of their agents alone or in combination with fluoride. Bovine enamel blocks were randomly allocated to five groups of 20 and exposed to: Sensodyne ProNamel (1,425 ppm F as NaF, 5% KNO(3)), Sensodyne Original (no fluoride, 10% SrCl(2)), Colgate Sensitive (1,450 ppm F as sodium monofluorophosphate, 5% K citrate), Crest (fluoride-only toothpaste, 1,100 ppm F as NaF) and water (negative control)...
2010: Caries Research
https://www.readbyqxmd.com/read/20122726/self-activated-luminescent-and-mesoporous-strontium-hydroxyapatite-nanorods-for-drug-delivery
#13
Cuimiao Zhang, Chunxia Li, Shanshan Huang, Zhiyao Hou, Ziyong Cheng, Piaoping Yang, Chong Peng, Jun Lin
Multifunctional strontium hydroxyapatite (SrHAp) nanorods with luminescent and mesoporous properties have been successfully synthesized by a hydrothermal method. SEM and TEM images indicate that the mesoporous SrHAp samples consist of monodiperse nanorods with lengths of 120-150 nm, diameters of around 20 nm, and the mesopore size of 3-5 nm. The as-obtained SrHAp nanorods show an intense bright blue emission (centered at 432 nm, lifetime 11.6 ns, quantum efficiency: 22%), which might arise from CO(2)(*-) radical impurities in the crystal lattice under long-wavelength UV-light irradiation...
April 2010: Biomaterials
https://www.readbyqxmd.com/read/19873258/the-effect-of-calcium-and-other-ions-on-the-autocatalytic-formation-of-trypsin-from-trypsinogen
#14
M R McDonald, M Kunitz
Crystalline trypsinogen is completely transformed into trypsin by means of trypsin in the presence of calcium salts. The process follows the course of a pure autocatalytic unimolecular reaction. In the absence of calcium salts, the autocatalytic formation of trypsin from trypsinogen is complicated by the transformation of part of the trypsinogen into an inert protein which cannot be changed into trypsin by any known means. Salts increase or decrease the rate of both reactions so that the ultimate amount of trypsin formed varies with the nature and concentration of the salt used...
September 20, 1941: Journal of General Physiology
https://www.readbyqxmd.com/read/19868742/experimental-studies-on-inflammation-ii-experimental-chemical-inflammation-in-vivo
#15
E P Wolf
1. None of the salts tested produce a marked inflammation in vivo in concentrations under 10 per cent. Potassium salts and the different citrates produced atypical inflammatory reactions in mice, but not in frogs. There was no true inflammation, however, characterized by blood vessel changes, migration of polymorphonuclear leucocytes and erythrocytes, and fluid exudation. 2. Synergistic action occurs when equal parts of strontium and magnesium salts are employed. There is a change in the appearance of the mesentery without a true inflammation, and this change does not occur with either salt alone...
March 31, 1923: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/19868564/experimental-studies-on-inflammation-i-the-influence-of-chemicals-upon-the-chemotaxis-of-leucocytes-in-vitro
#16
E P Wolf
1. Wright's method for the study of chemotaxis of leucocytes in vitro, slightly modified, has been found to be most satisfactory in the estimation of the degree of chemotaxis of various substances, because it is possible to make an exact quantitative determination of the leucocytes that have migrated from the blood clot and adhere to the surfaces containing the tested substance. 2. The calcium ion is the only inorganic ion per se which is found to be positively chemotactic under the conditions of these experiments...
September 30, 1921: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/19670837/architectures-of-strontium-hydroxyapatite-microspheres-solvothermal-synthesis-and-luminescence-properties
#17
Cuimiao Zhang, Ziyong Cheng, Piaoping Yang, Zhenhe Xu, Chong Peng, Guogang Li, Jun Lin
Strontium hydroxyapatite (Sr(5)(PO(4))(3)OH, SrHAp) microspheres with 3D architectures have been successfully prepared through a efficient and facile solvothermal process. The experimental results indicate that the SrHAP microspheres are composed of a large amount of nanosheets, which are assembled in a radial form from the center to the surface of the microspheres. The as-obtained SrHAp samples show an intense and bright blue emission from 350 to 570 nm centered at 427 nm (CIE coordinates: x = 0.153, y = 0...
December 1, 2009: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/19455835/-adsorption-behavior-of-immobilized-nanometer-barium-strontium-titanate-for-cadmium-ion-in-water
#18
Dong Zhang, Wen-Jie Zhang, Xin Guan, Hong Gao, Hong-Bo He
Nanometer barium-strontium titanate immobilized on silica gel G was successfully prepared by the citrate acid sol-gel method and characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared spectrophotometer (FTIR). By means of the determination of flame atomic absorption spectrometry (FAAS), the adsorption behavior of immobilized nanometer-barium strontium titanate for cadmium ion was investigated. The results showed that the nanometer barium-strontium titanate was immobilized on the silica gel G firmly, gaining a new sort of adsorbent...
March 2009: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
https://www.readbyqxmd.com/read/19214713/comparison-of-an-experimental-bone-cement-with-a-commercial-control-hydroset
#19
COMPARATIVE STUDY
O M Clarkin, D Boyd, S Madigan, M R Towler
Glass polyalkenoate cements based on strontium calcium zinc silicate glasses (Zn-GPCs) and high molecular weight polyacrylic acids (PAA) (MW; 52,000-210,000) have been shown to exhibit mechanical properties and in vitro bioactivity suitable for arthroplasty applications. Unfortunately, these formulations exhibit working times and setting times which are too short for invasive surgical applications such as bone void filling and fracture fixation. In this study, Zn-GPCs were formulated using a low molecular weight PAA (MW; 12,700) and a modifying agent, trisodium citrate dihydrate (TSC), with the aim of improving the rheological properties of Zn-GPCs...
July 2009: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/19213053/antibacterial-properties-of-a-tri-sodium-citrate-modified-glass-polyalkenoate-cement
#20
A W Wren, D Boyd, R Thornton, J C Cooney, M R Towler
Primary deep infection following joint replacement surgery accounts for 7% of all revisions. Glass polyalkenoate cements (GPCs) have previously been shown to exhibit antibacterial properties. The present study had two objectives. The first was to determine if addition of tri-sodium citrate (TSC) to the powder phase of an Al-free GPC (0.04 SrO-0.12 CaO-0.36 ZnO-0.48 SiO2, by mole fraction) enhanced the resultant cement's antibacterial properties against three strains of bacteria that are commonly found in periprosthetic sites following total joint replacements (TJRs); namely, E...
August 2009: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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