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Fluoridation

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https://www.readbyqxmd.com/read/28345925/metal-insertion-in-a-methylamine-functionalized-zirconium-metal-organic-framework-for-enhanced-carbon-dioxide-capture
#1
A Paulina Gómora-Figueroa, Jarad A Mason, Miguel I Gonzalez, Eric D Bloch, Katie R Meihaus
The reaction of ZrCl4 with 2',3',5',6'-tetramethylamino-p-terphenyl-4,4″-dicarboxylic acid (H2tpdc-4CH2NH2·3HCl) in the presence of NaF affords Zr6O4(OH)2.1F1.9(tpdc-4CH2NH2·3HCl)6 (1), which is a new member of the Zr6O4(OH)4(dicarboxylate linker)12 or UiO-68 family, and exhibits high porosity with BET and Langmuir surface areas of 1910 m(2)/g and 2220 m(2)/g, respectively. Remarkably, fluoride ion incorporation in the zirconium clusters results in increased thermal stability, marking the first example of enhancement in the stability of a UiO framework by this defect-restoration approach...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28345870/ultra-fast-separation-and-analysis-of-monoclonal-antibody-aggregates-using-membrane-chromatography
#2
Pedram Madadkar, Umatheny Umatheva, Geoff Hale, Yves Durocher, Raja Ghosh
We discuss a method for rapid and cost-effective analysis of monoclonal antibody (mAb) aggregates. Hydrophobic interaction membrane chromatography, which was previously shown to be highly suitable for such separation and analysis, was used in a recently developed format referred to as laterally-fed membrane chromatography (or LFMC). A stack of rectangular polyvinylidene fluoride (or PVDF) membranes having 0.22 µm pores housed within a modified analytical-scale LFMC device was used for analyzing aggregate types and content in different monoclonal antibody samples...
March 27, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28345213/caries-experience-of-children-in-primary-schools-with-long-term-tooth-brushing-programs-a-pilot-australian-study
#3
T Cakar, L Harrison-Barry, M L Pukallus, S Kazoullis, W K Seow
OBJECTIVE: The aim of this study was to evaluate a primary school-based tooth brushing (TB) program conducted in a low socio-economic area of Queensland, Australia, to determine its effectiveness in reducing caries. METHODS: Records kept at the central dental clinic of the district were used to analyse the caries experience (decayed, missing, filled teeth [dmft/DMFT]) and caries prevalence in children from two schools with long-term TB programs (TB) (N=1191) and three Non-TB schools (N=553)...
March 26, 2017: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/28342024/towards-optimization-of-odonto-osteogenic-bioengineering-in-vitro-comparison-of-simvastatin-sodium-fluoride-melanocyte-stimulating-hormone
#4
Vahid Zijah, Roya Salehi, Marziyeh Aghazadeh, Mohammad Samiei, Effat Alizadeh, Soodabeh Davaran
Tissue engineering has emerged as a potential therapeutic option for dental problems in recent years. One of the policies in tissue engineering is to use both scaffolds and additive factors for enhancing cell responses. This study aims to evaluate and compare the effect of three types of biofactors on poly-caprolactone-poly-ethylene glycol-poly caprolactone (PCL-PEG-PCL) nanofibrous scaffold on human dental pulp stem cell (hDPSCs) engineering. The PCL-PEG-PCL copolymer was synthesized with ring opening polymerization method, and its nanofiber scaffold was prepared by electrospinning method...
March 25, 2017: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/28340462/assessment-of-arsenic-and-fluorine-in-surface-soil-to-determine-environmental-and-health-risk-factors-in-the-comarca-lagunera-mexico
#5
Yareli A Sariñana-Ruiz, Jorge Vazquez-Arenas, Fabiola S Sosa-Rodríguez, Israel Labastida, Ma Aurora Armienta, Antonio Aragón-Piña, Miguel A Escobedo-Bretado, Laura S González-Valdez, Patricia Ponce-Peña, Hugo Ramírez-Aldaba, René H Lara
Total, bioaccessible and mobile concentrations of arsenic and fluorine are determined in polluted surface soil within the Comarca Lagunera region using standardized protocols to obtain a full description of the environmental behavior for these elements. The composition of mineral phases associated with them is evaluated with microscopic and spectroscopic techniques. Mineralogical characterizations indicate that ultra-fine particles (<1-5 μm) including mimetite-vanadite (Pb5(AsO4)3Cl, Pb5(AsO4, VO4)3Cl)-like, lead arseniate (Pb3(AsO4)2)-like and complex arsenic-bearing compounds are main arsenic-bearing phases, while fluorite (CaF2) is the only fluorine-bearing phase...
March 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340151/effect-of-excess-dietary-fluoride-on-laying-performance-and-antioxidant-capacity-of-laying-hens
#6
L P Miao, M Y Zhou, X Y Zhang, C Yuan, X Y Dong, X T Zou
The objective of this study was to investigate the effects of excess dietary fluoride (F) on laying performance and antioxidant capacity of laying hens. A total of 576 laying hens, 51 wk old, was randomly divided into 6 groups, each of which included 6 replicates of 16 hens. Graded amounts of sodium fluoride (NaF) were added to the basal diet to achieve concentrations of 16 (control), 200, 400, 600, 800, and 1,000 mg/kg F, respectively. Dietary F at 1,000 mg/kg significantly decreased ADFI, laying rate, and average egg weight, and increased feed conversion ratio (FCR) (P < 0...
March 11, 2017: Poultry Science
https://www.readbyqxmd.com/read/28340098/effect-of-fluoride-releasing-resin-composite-in-white-spot-lesions-prevention-a-single-centre-split-mouth-randomized-controlled-trial
#7
Mohannad M Alabdullah, Alaa Nabawia, Mowaffak A Ajaj, Humam Saltaji
Introduction: The objective of this two-arm split-mouth randomized trial, was to evaluate the ability of fluoride-releasing resin composite to prevent demineralization and white spot lesion (WSL) formation, during orthodontic treatment with fixed appliances. Methods: Patients needing comprehensive orthodontic treatment were randomly allocated into two groups, according to the half split-mouth technique. This trial examined a total of 300 teeth in each group: the control group, in which brackets were fixed with a non-fluoride-containing adhesive resin; and the intervention group, in which brackets were fixed with a fluoride-containing adhesive resin...
March 2, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28339032/clc-7-ostm1-contribute-to-the-ability-of-tea-polyphenols-to-maintain-bone-homeostasis-in-c57bl-6-mice-protecting-against-fluorosis
#8
Bing-Yun Li, Yan-Hui Gao, Jun-Rui Pei, Yan-Mei Yang, Wei Zhang, Dian-Jun Sun
Epidemiological investigations indicate that certain ingredients in tea bricks can antagonize the adverse effects of fluoride. Tea polyphenols (TPs), the most bioactive ingredient in tea bricks, have been demonstrated to be potent bone-supporting agents. ClC‑7 is known to be crucial for osteoclast (OC) bone resorption. Thus, in this study, we investigated the potential protective effects of TPs against fluorosis using a mouse model and explored the underlying mechanisms with particular focus on ClC‑7...
March 22, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28338040/regular-supervised-fluoride-mouthrinse-use-by-children-and-adolescents-associated-with-caries-reduction
#9
Mishel Shahid
Data sourcesCochrane Oral Health Group's Trials Register, the Cochrane Central Register of Controlled Trials (CENTRAL), Medline, Embase, CINAHL, LILACS, BBO, Proquest Dissertations and Theses, Web of Science Conference Proceedings, ClinicalTrials.gov and the WHO International Clinical Trials Registry Platform.Study selectionRandomised or quasi-randomised controlled trials where blind outcome assessment was stated or indicated, comparing fluoride mouthrinse with placebo or no treatment in children up to 16 years of age with a duration of at least 12 months...
March 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28338038/school-based-dental-sealant-programmes-may-be-effective-in-caries-prevention
#10
Tarek Himida, Ucheka Promise
DesignSplit-mouth randomised controlled clinical trial.InterventionSchool-based dental sealant (SBDS) programme. The study population that was selected from 67-year-old pupils of 16 elementary schools in areas of low socioeconomic status within Nice, France. Children with first permanent molar pairs sufficiently erupted for sealing with no caries (ICDAS [International Caries Detection and Assessment System] 0) or initial enamel lesions (ICDAS 1-2) were included. Children were randomised to either the intervention group (light polymerised resin-based sealant with fluoride) or the control group (no treatment)...
March 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28337586/the-role-of-fluoride-and-chlorhexidine-in-preserving-hardness-and-mineralization-of-enamel-and-cementum-after-gamma-irradiation
#11
Rowida Abdalla, Maha A Niazy, Wael E Jamil, Hala A Hazzaa, Amal A Elbatouti
The purpose of this study was to evaluate the effect of 0.05% sodium fluoride and 0.12% chlorhexidine mouthwashes on the micro-hardness of tooth enamel and cementum that was exposed to therapeutic doses of gamma radiation. Sixty extracted human teeth were divided into two groups, one was irradiated, the other was not irradiated. The two groups were further subdivided into three subgroups, which were each treated either with 0.05% sodium fluoride or with 0.12% chlorhexidine; the third subgroup served as a control...
March 23, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28336949/induction-of-apoptosis-and-ganoderic-acid-biosynthesis-by-camp-signaling-in-ganoderma-lucidum
#12
Bang-Jau You, Ni Tien, Miin-Huey Lee, Bo-Ying Bao, Yih-Shyuan Wu, Tsung-Chi Hu, Hong-Zin Lee
Apoptosis is an essential physiological process that controls many important biological functions. However, apoptosis signaling in relation to secondary metabolite biosynthesis in plants and fungi remains a mystery. The fungus Ganoderma lucidum is a popular herbal medicine worldwide, but the biosynthetic regulation of its active ingredients (ganoderic acids, GAs) is poorly understood. We investigated the role of 3',5'-cyclic adenosine monophosphate (cAMP) signaling in fungal apoptosis and GA biosynthesis in G...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336867/synthesis-of-multicolor-core-shell-naluf%C3%A2-yb-3-ln-3-caf%C3%A2-upconversion-nanocrystals
#13
Hui Li, Shuwei Hao, Chunhui Yang, Guanying Chen
The ability to synthesize high-quality hierarchical core/shell nanocrystals from an efficient host lattice is important to realize efficacious photon upconversion for applications ranging from bioimaging to solar cells. Here, we describe a strategy to fabricate multicolor core @ shell α-NaLuF₄:Yb(3+)/Ln(3+)@CaF₂ (Ln = Er, Ho, Tm) upconversion nanocrystals (UCNCs) based on the newly established host lattice of sodium lutetium fluoride (NaLuF₄). We exploited the liquid-solid-solution method to synthesize the NaLuF₄ core of pure cubic phase and the thermal decomposition approach to expitaxially grow the calcium fluoride (CaF₂) shell onto the core UCNCs, yielding cubic core/shell nanocrystals with a size of 15...
February 7, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335279/a-novel-polyvinylidene-fluoride-tree-like-nanofiber-membrane-for-microfiltration
#14
Zongjie Li, Weimin Kang, Huihui Zhao, Min Hu, Na Wei, Jiuan Qiu, Bowen Cheng
A novel polyvinylidene fluoride (PVDF) tree-like nanofiber membrane (PVDF-TLNM) was fabricated by adding tetrabutylammonium chloride (TBAC) into a PVDF spinning solution via one-step electrospinning. The structure of the prepared membranes was characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and pore size analysis, and the hydrophilic property and microfiltration performance were also evaluated. The results showed that the tree-like nanofiber was composed of trunk fibers and branch fibers with diameters of 100-500 nm and 5-100 nm, respectively...
August 19, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335195/pmn-pt-pvdf-nanocomposite-for-high-output-nanogenerator-applications
#15
Chuan Li, Wenbo Luo, Xingzhao Liu, Dong Xu, Kai He
The 0.7Pb(Mg1/3Nb2/3)O₃-0.3PbTiO₃(0.7PMN-0.3PT) nanorods were obtained via hydrothermal method with high yield (over 78%). Then, new piezoelectric nanocomposites based on (1-x)Pb(Mg1/3Nb2/3)O₃-xPbTiO₃ (PMN-PT) nanorods were fabricated by dispersing the 0.7PMN-0.3PT nanorods into piezoelectric poly(vinylidene fluoride) (PVDF) polymer. The mechanical behaviors of the nanocomposites were investigated. The voltage and current generation of PMN-PT/PVDF nanocomposites were also measured. The results showed that the tensile strength, yield strength, and Young's modulus of nanocomposites were enhanced as compared to that of the pure PVDF...
April 11, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334646/defluoridation-of-drinking-water-using-a-new-flow-column-electrocoagulation-reactor-fcer-experimental-statistical-and-economic-approach
#16
Khalid S Hashim, Andy Shaw, Rafid Al Khaddar, Montserrat Ortoneda Pedrola, David Phipps
A new batch, flow column electrocoagulation reactor (FCER) that utilises a perforated plate flow column as a mixer has been used to remove fluoride from drinking water. A comprehensive study has been carried out to assess its performance. The efficiency of fluoride removal (R%) as a function of key operational parameters such as initial pH, detention time (t), current density (CD), inter-electrode distance (ID) and initial concentration (C0) has been examined and an empirical model has been developed. A scanning electron microscopy (SEM) investigation of the influence of the EC process on morphology of the surface of the aluminium electrodes, showed the erosion caused by aluminium loss...
March 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28333598/achieving-health-equity-through-community-engagement-in-translating-evidence-to-policy-the-san-francisco-health-improvement-partnership-2010-2016
#17
Kevin Grumbach, Roberto A Vargas, Paula Fleisher, Tomás J Aragón, Lisa Chung, Colleen Chawla, Abbie Yant, Estela R Garcia, Amor Santiago, Perry L Lang, Paula Jones, Wylie Liu, Laura A Schmidt
BACKGROUND: The San Francisco Health Improvement Partnership (SFHIP) promotes health equity by using a novel collective impact model that blends community engagement with evidence-to-policy translational science. The model involves diverse stakeholders, including ethnic-based community health equity coalitions, the local public health department, hospitals and health systems, a health sciences university, a school district, the faith community, and others sectors. COMMUNITY CONTEXT: We report on 3 SFHIP prevention initiatives: reducing consumption of sugar sweetened beverages (SSBs), regulating retail alcohol sales, and eliminating disparities in children's oral health...
March 23, 2017: Preventing Chronic Disease
https://www.readbyqxmd.com/read/28332978/structural-reorganization-of-the-chromatin-remodeling-enzyme-chd1-upon-engagement-with-nucleosomes
#18
Ramasubramanian Sundaramoorthy, Amanda L Hughes, Vijender Singh, Nicola Wiechens, Daniel P Ryan, Hassane El-Mkami, Maxim Petoukhov, Dmitri I Svergun, Barbara Treutlein, Salina Quack, Monika Fischer, Jens Michaelis, Bettina Böttcher, David G Norman, Tom Owen-Hughes
The yeast Chd1 protein acts to position nucleosomes across genomes. Here we model the structure of the Chd1 protein in solution and when bound to nucleosomes. In the apo state the DNA binding domain contacts the edge of the nucleosome while in the presence of the non-hydrolyzable ATP analog, ADP-beryllium fluoride, we observe additional interactions between the ATPase domain and the adjacent DNA gyre 1.5 helical turns from the dyad axis of symmetry. Binding in this conformation involves unravelling the outer turn of nucleosomal DNA and requires substantial reorientation of the DNA binding domain with respect to the ATPase domains...
March 23, 2017: ELife
https://www.readbyqxmd.com/read/28332844/aryl-fluorosulfate-trapped-staudinger-reduction
#19
Gerui Ren, Qinheng Zheng, Hua Wang
A chemoselective Staudinger reduction/sulfur(VI) fluoride exchange cascade has been developed to join two chemical segments through an aryl sulfamate ester (RNH-SO2-OAr) linkage. Aryl fluorosulfate is exploited in this work as the first tetrahedral electrophilic trap for the in situ generated iminophosphorane. Ten examples using azide-containing compounds are presented.
March 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28332397/base-catalysis-enables-access-to-%C3%AE-%C3%AE-difluoroalkylthioethers
#20
Douglas L Orsi, Brandon J Easley, Ashley M Lick, Ryan A Altman
A nucleophilic addition reaction of aryl thiols to readily available β,β-difluorostyrenes provides α,α-difluoroalkylthioethers. The reaction proceeds through an unstable anionic intermediate, prone to eliminate fluoride and generate α-fluorovinylthioethers. However, the use of base catalysis overcomes the facile β-fluoride elimination, generating α,α-difluoroalkylthioethers in excellent yields and selectivities.
March 23, 2017: Organic Letters
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