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Fluoridation

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https://www.readbyqxmd.com/read/28738594/optical-sensor-for-fluoride-determination-in-tea-sample-based-on-evanescent-wave-interaction-and-fiber-optic-integration
#1
Yan Xiong, Jiayi Wu, Qing Wang, Jing Xu, Shenwen Fang, Jie Chen, Ming Duan
In this work, a miniaturized optical sensor was developed for fluoride determination in tea samples to evaluate their specific risks of fluorosis for public health based on evanescent-wave interaction. The sensor design was integrated on the optical fiber by utilizing the evanescent wave produced on the fiber surface to react with sensing reagents. According to the absorption change at 575nm, fluoride could be determined by colorimetric method and evaluated by Beer's law. With improved performances of small detection volume (1...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737927/a-facile-non-reactive-hydrogen-peroxide-h2o2-detection-method-enabled-by-ion-chromatography-with-uv-detector
#2
Mingrui Song, Junli Wang, Baiyang Chen, Lei Wang
Hydrogen peroxide (H2O2) is present ubiquitously in natural environment and nowadays widely used in water and wastewater treatment processes for pollutant control. However, current analytical methods for H2O2 inevitably require reactions between H2O2 and other reactants to yield signals, thus likely subjective to interferences of coexisting colored, oxidative, and reductive compounds. In order to overcome these barriers, we herein for the first time propose to analyze H2O2 by ion chromatography (IC) equipped with ultraviolet (UV) detector...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28737337/-salt-fluoridation-and-dental-caries-state-of-the-question
#3
Solveig Vautey, Eva Ranivoharilanto, Bernard Decroix, Stéphanie Tubert-Jeannin
Today, a salt fluoridation programme could be useful in areas in which fluoridated toothpastes are not widely used. The communication policy promoting the consumption of fluoridated salt is crucial to ensure the effectiveness of such a programme.</ce:para>.
April 27, 2017: Santé Publique: Revue Multidisciplinaire Pour la Recherche et L'action
https://www.readbyqxmd.com/read/28735734/variation-of-high-intensity-therapeutic-ultrasound-hitu-pressure-field-characterization-effects-of-hydrophone-choice-nonlinearity-spatial-averaging-and-complex-deconvolution
#4
Yunbo Liu, Keith A Wear, Gerald R Harris
Reliable acoustic characterization is fundamental for patient safety and clinical efficacy during high-intensity therapeutic ultrasound (HITU) treatment. Technical challenges, such as measurement variation and signal analysis, still exist for HITU exposimetry using ultrasound hydrophones. In this work, four hydrophones were compared for pressure measurement: a robust needle hydrophone, a small polyvinylidene fluoride capsule hydrophone and two fiberoptic hydrophones. The focal waveform and beam distribution of a single-element HITU transducer (1...
July 20, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28735355/a-systematic-review-of-dental-disease-management-in-cancer-patients
#5
Catherine H L Hong, Shijia Hu, Thijs Haverman, Monique Stokman, Joel J Napeñas, Jacolien Bos-den Braber, Erich Gerber, Margot Geuke, Emmanouil Vardas, Tuomas Waltimo, Siri Beier Jensen, Deborah P Saunders
INTRODUCTION: This systematic review aims to update on the prevalence of odontogenic-related infections and the efficacy of dental strategies in preventing dental-related complications in cancer patients since the 2010 systematic review. REVIEW METHOD: A literature search was conducted in the databases MEDLINE/PubMed and EMBASE for articles published between 1 January 2009 and 30 June 2016. Each study was assessed by 2 reviewers and the body of evidence for each intervention was assigned an evidence level...
July 22, 2017: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
https://www.readbyqxmd.com/read/28734665/potential-peptidic-proteasome-inhibitors-by-incorporation-of-an-electrophilic-trap-based-on-amino-acid-derived-%C3%AE-substituted-sulfonyl-fluorides
#6
Natalia Herrero Alvarez, Helmus van de Langemheen, Arwin J Brouwer, Rob M J Liskamp
Peptido sulfonyl fluoride derivatives were designed and synthesized containing a substituent on the alpha position (αPSFs) with respect to the sulfonyl fluoride electrophilic trap. The chemical reactivity of these α-substituted amino sulfonyl fluorides was studied and compared with the previously described β-substituted amino sulfonyl fluorides in order to get a deeper insight into the importance of the immediate structural environment of the sulfonyl fluoride moiety. Unfortunately, the poor solubility of the resulting αPSFs precluded a proper evaluation of their biological activity...
July 12, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28732998/effects-of-dissolution-conditions-on-the-properties-of-pvdf-ultrafiltration-membranes
#7
Ikechukwu A Ike, Jianhua Zhang, Andrew Groth, John D Orbell, Mikel Duke
Poly (vinylidene fluoride) (PVDF) is an important membrane forming material for water treatment. Earlier works have shown that major morphological changes can be achieved when PVDF is dissolved under different conditions with practical applications in membrane distillation and protein attachment. However, no previous report has discussed the effects of dissolution conditions on the performance of PVDF under ultrafiltration, which is one of the most important applications of the polymer. In this work, four different PVDF ultrafiltration membranes were produced from dopes dissolved either by stirring at 24°C, 90°C, 120°C or by sonication...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732885/fouling-resistant-pvdf-carboxymethyl-chitosan-composite-nanofiltration-membranes-for-humic-acid-removal
#8
Kavitha Ekambaram, Mohan Doraisamy
In this work, carboxymethyl chitosan without a crosslinking agent was blended with polyvinylidene fluoride using non solvent induced phase inversion process. Carboxymethyl chitosan was synthesized using monochloroacetic acid and isopropanol and its structural elucidation was done. Synthesized carboxymethyl chitosan was incorporated with PVDF and investigated for its casting dope viscosity, x-ray photoelectron spectroscopy, thermal gravimetric analysis, mechanical properties, contact angle, scanning electron microscopy, atomic force microscopy and filtration studies...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28731769/first-principles-prediction-of-spin-polarized-multiple-dirac-rings-in-manganese-fluoride
#9
Yalong Jiao, Fengxian Ma, Chunmei Zhang, John Bell, Stefano Sanvito, Aijun Du
Spin-polarized materials with Dirac features have sparked great scientific interest due to their potential applications in spintronics. But such a type of structure is very rare and none has been fabricated. Here, we investigate the already experimentally synthesized manganese fluoride (MnF_{3}) as a novel spin-polarized Dirac material by using first-principles calculations. MnF_{3} exhibits multiple Dirac cones in one spin orientation, while it behaves like a large gap semiconductor in the other spin channel...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731482/radiofluorination-of-a-nhc-pf5-adduct-toward-new-probes-for-18-f-pet-imaging
#10
Boris Vabre, Kantapat Chansaenpak, Mengzhe Wang, Hui Wang, Zibo Li, François P Gabbaï
The radiofluorination of N-heterocyclic carbene (NHC) phosphorus(v) fluoride adducts has been investigated. The results show that the IMe-PF5 derivative (IMe = 1,3-dimethylimidazol-2-ylidene) undergoes a Lewis acid promoted (18)F-(19)F isotopic exchange. The resulting radiofluorinated probe is remarkably resistant to hydrolysis both in vitro as well as in vivo.
July 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28731093/rapid-and-selective-synthesis-of-spiropyrazolines-and-pyrazolylphthalides-employing-seyferth-gilbert-reagent
#11
Ashis Kumar Gupta, Narendra Kumar Vaishanv, Ruchir Kant, Kishor Mohanan
An unexpected product-selectivity in the reaction of 2-arylideneindane-1,3-dione with dimethyl diazomethylphosphonate leading to the formation of two different types of products is reported. The reaction carried out in acetone in the presence of catalytic amount of cesium fluoride afforded spiropyrazoline phosphonates via 1,3-dipolar cycloaddition reaction, whereas the reaction in methanol yielded an interesting class of pyrazolylphthalides. This strategy provides an efficient alternative method for the construction of pyrazolylphthalides, and moreover, the process is general, works under mild conditions, and exhibits high functional group compatibility...
July 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28730928/feasibility-of-na-18-f-pet-ct-and-mri-for-noninvasive-in-vivo-quantification-of-knee-pathophysiological-bone-metabolism-in-a-canine-model-of-post-traumatic-osteoarthritis
#12
Maria I Menendez, Bianca Hettlich, Lai Wei, Michael V Knopp
PURPOSE: To assess and quantify by molecular imaging knee osseous metabolic changes serially in an in vivo canine model of posttraumatic osteoarthritis (PTOA) of the knee utilizing sodium fluoride (Na(18)F) positron emission tomography (PET)/computed tomography (CT) coregistered with magnetic resonance imaging (MRI). MATERIALS AND METHODS: Sodium fluoride PET imaging of 5 canines was performed prior to anterior cruciate ligament transection (ACLT) and 2 times post-ACLT (3 and 12 weeks)...
January 2017: Molecular Imaging
https://www.readbyqxmd.com/read/28730623/effects-of-fluoride-modified-titanium-surfaces-with-the-similar-roughness-on-runx2-gene-expression-of-osteoblast-like-mg63-cells
#13
Ji-Hyoun Lee, Jai-Young Koak, Young-Jun Lim, Ho-Beom Kwon, Hyunjoon Kong, Myung-Joo Kim
Chemical modification of titanium surfaces by hydrofluoric acid (HF) is an effective method to improve bone responses on titanium implant surfaces. In the present study, titanium disks were sandblasted with titanium oxide grits and modified with 0.2% and 0.4% of diluted HF under different exposure times of 40 and 60 s. Surface characteristics, such as surface chemical composition, surface topography, and surface wettability, were investigated. To examine MG63 osteoblast-like cell responses to fluoride-modified titanium surfaces with roughness similar to that of nonmodified surfaces, a cell proliferation assay was performed and gene expression levels of Runx2 were evaluated using real-time PCR...
July 21, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28730575/the-effect-of-chronic-fluorosis-on-calcium-ions-and-camkii%C3%AE-and-c-fos-expression-in-the-rat-hippocampus
#14
Yao Teng, Jing Zhang, Zigui Zhang, Juan Feng
This study investigated neurotoxicity of chronic fluorosis in the rat hippocampus. Newly weaning, male, Sprague-Dawley (SD) rats were administered 15, 30, and 60 mg/L sodium fluoride (NaF) solution (fluorine ion concentration 8.25, 16.50, and 33.00 mg/L, respectively), and tap water, for 18 months. The neurotoxicological mechanism was examined with a focus on intracellular calcium overload. Results showed that as the fluoride concentration increased, calcium ion concentration [Ca(2+)], the expression of calcium/calmodulin-dependent protein kinase II α (CaMKIIα), and the expression of catus proto-oncogene protein c-fos (c-fos) all tend to increase...
July 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28730358/hydrogeochemical-characterization-and-groundwater-quality-assessment-in-intruded-coastal-brine-aquifers-laizhou-bay-china
#15
Xiaoying Zhang, Jinjie Miao, Bill X Hu, Hongwei Liu, Hanxiong Zhang, Zhen Ma
The aquifer in the coastal area of the Laizhou Bay is affected by salinization processes related to intense groundwater exploitation for brine resource and for agriculture irrigation during the last three decades. As a result, the dynamic balances among freshwater, brine, and seawater have been disturbed and the quality of groundwater has deteriorated. To fully understand the groundwater chemical distribution and evolution in the regional aquifers, hydrogeochemical and isotopic studies have been conducted based on the water samples from 102 observation wells...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28730190/comparison-of-halide-receptors-based-on-h-halogen-chalcogen-pnicogen-and-tetrel-bonds
#16
Steve Scheiner
A series of halide receptors are constructed and the geometries and energetics of their binding to F(-), Cl(-), and Br(-) assessed by quantum calculations. The dicationic receptors are based on a pair of imidazolium units, connected via a benzene spacer. The imidazoliums each donate a proton to a halide in a pair of H-bonds. Replacement of the two bonding protons by Br leads to binding via a pair of halogen bonds. Likewise, chalcogen, pnicogen, and tetrel bonds occur when the protons are replaced, respectively, by Se, As, and Ge...
July 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28729788/a-comparative-in-vitro-study-on-fluoride-release-and-water-sorption-of-different-flowable-esthetic-restorative-materials
#17
Asmaa Youssif Harhash, Iman Ibrahim ElSayad, Ahmad G S Zaghloul
OBJECTIVES: The objective of the study was to evaluate fluoride release and water sorption of three flowable esthetic restorative materials: a giomer, a fluoride-releasing resin composite, and a nonfluoridated resin composite. MATERIALS AND METHODS: Ten samples from a giomer, a fluoride releasing nano-hybrid, and a nonfluoridated nano-hybrid composite were prepared and immersed in deionized water. Fluoride measurements were done using an ion-specific electrode attached to a microprocessor-based fluoride meter after 1 day, 1 week, and 4 weeks...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28728132/melatonin-protect-the-development-of-preimplantation-mouse-embryos-from-sodium-fluoride-induced-oxidative-injury
#18
Jiamin Zhao, Beibei Fu, Wei Peng, Tingchao Mao, Haibo Wu, Yong Zhang
Recently study shows that melatonin can protect embryos from the culture environment oxidative stress. However, the protective effect of melatonin on the mouse development of preimplantation embryos under sodium fluoride (NaF) induced oxidative stress is still unclear. Here, we showed that exposure to NaF significantly increased the reactive oxygen species (ROS) level, decreased the blastocyst formation rates, and increased the fragmentation, apoptosis and retardation of blastocysts in the development of mouse preimplantation embryos...
June 29, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28728112/reductive-defluorination-of-perfluorooctanoic-acid-by-titanium-iii-citrate-with-vitamin-b12-and-copper-nanoparticles
#19
Yu-Chi Lee, Yi-Pei Chen, Meng-Jia Chen, Jeff Kuo, Shang-Lien Lo
Perfluorooctanoic acid (PFOA) is widespread in the environment, which causes serious health and safety concerns. A mechanistic study on reductive defluorination of PFOA by titanium(III) citrate in the presence of catalysts was conducted. Vitamin B12 was used to catalyze reduction reactions by shuttling electrons from a reducing agent (electron donor) to PFOA to produce a Co-carbon bond intermediates. In the presence of copper nanoparticles, a precursor complex, B12-C7F14COOH, adsorbed on the metal surface, followed by a hydrogenolytic reaction to form less-fluorinated products...
June 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28727988/environmental-exposures-and-pediatric-kidney-function-and-disease-a-systematic-review
#20
REVIEW
Laura Y Zheng, Alison P Sanders, Jeffrey M Saland, Robert O Wright, Manish Arora
BACKGROUND: Environmental chemical exposures have been implicated in pediatric kidney disease. No appraisal of the available evidence has been conducted on this topic. METHODS: We performed a systematic review of the epidemiologic studies that assessed association of environmental exposures with measures of kidney function and disease in pediatric populations. The search period went through July 2016. RESULTS: We found 50 studies that met the search criteria and were included in this systematic review...
July 17, 2017: Environmental Research
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