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https://www.readbyqxmd.com/read/28524666/on-the-possible-formation-of-h3o-cations-due-to-the-aluminum-fluoride-interactions-with-water
#1
Dorota Wileńska, Piotr Skurski, Iwona Anusiewicz
The isomeric structures formed by the aluminum fluoride (AlF3) system and surrounding water molecules were theoretically examined by employing MP2 and CCSD(T) methods and the aug-cc-pVDZ basis set together with the polarized continuum solvation model within a self-consistent reaction field treatment. The calculations performed for the AlF3∙n(H2O) systems (n=1 6) revealed that facial and meridional octahedral structures correspond to the lowest energy isomers for the AlF3∙4H2O, AlF3∙5H2O, and AlF3∙6H2O systems, whereas the isomers containing the H3O+ and AlF3OH- fragments were predicted to be less stable by only 5 7 kcal/mol which indicates the possible formation of the hydronium cations in such systems even at room temperature...
May 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28523795/efficacy-of-an-oral-health-literacy-intervention-among-indigenous-australian-adults
#2
Xiangqun Ju, David Brennan, Eleanor Parker, Helen Mills, Kostas Kapellas, Lisa Jamieson
OBJECTIVE: To determine the effect of an oral health literacy intervention on oral health literacy-related outcomes among rural-dwelling Indigenous Australian adults. METHODS: A total of 400 Indigenous adults (203 intervention and 197 control participants) were recruited into a randomized controlled trial; a functional, context-specific oral health literacy interventions were developed and implemented by Indigenous staff. The intervention comprised five sessions, each lasting 1...
May 19, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28523621/ecotoxicological-assessment-of-the-impact-of-fluoride-f-and-turbidity-on-the-freshwater-snail-physella-acuta-in-a-polluted-river-receiving-an-industrial-effluent
#3
Julio A Camargo, Álvaro Alonso
We carried out field studies and laboratory experiments to assess the impact of fluoride (F(-)) and turbidity on the freshwater snail Physella acuta in a polluted river receiving an industrial effluent (the middle Duraton River, Central Spain). Fluoride concentrations and turbidity levels significantly increased downstream from the industrial effluent (with the highest values being 0.6 mg F(-)/L and 55.2 nephelometric turbidity unit). In addition, higher deposition of fine inorganic matter was evident at polluted sampling sites...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28517028/aic-identifies-optimal-representation-of-longitudinal-dietary-variables
#4
John VanBuren, Joseph Cavanaugh, Teresa Marshall, John Warren, Steven M Levy
OBJECTIVES: The Akaike Information Criterion (AIC) is a well-known tool for variable selection in multivariable modeling as well as a tool to help identify the optimal representation of explanatory variables. However, it has been discussed infrequently in the dental literature. The purpose of this paper is to demonstrate the use of AIC in determining the optimal representation of dietary variables in a longitudinal dental study. METHODS: The Iowa Fluoride Study enrolled children at birth and dental examinations were conducted at ages 5, 9, 13, and 17...
May 18, 2017: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/28514080/methane-emission-from-feather-moss-stands
#5
Dheeraj Kanaparthi, Andreas Reim, Guntars O Martinson, Bianca Pommerenke, Ralf Conrad
Data from remote sensing and Eddy towers indicate that forests are not always net sinks for atmospheric CH4 . However, studies describing specific sources within forests and functional analysis of microorganisms on sites with CH4 turnover are scarce. Feather moss stands were considered to be net sinks for carbon dioxide, but received little attention to their role in CH4 cycling. Therefore, we investigated methanogenic rates and pathways together with the methanogenic microbial community composition in feather moss stands from temperate and boreal forests...
May 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28513762/water-fluoridation-in-brazilian-cities-at-the-first-decade-of-the-21st-century
#6
Paulo Frazão, Paulo Capel Narvai
OBJECTIVE: To assess the coverage of the fluoridation of the public water supply in Brazilian municipalities at the first decade of the 21st century, according to population size and municipal human development index (MHDI). METHODS: We have used data produced by national information agencies and the United Nations Development Programme. Population size was separated into < 10,000, 10,000-50,000, and > 50,000 inhabitants. The MHDI was classified into < 0...
May 15, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28513723/amphiphilic-coatings-for-the-protection-of-upconverting-nanoparticles-against-dissolution-in-aqueous-media
#7
Olivija Plohl, Slavko Kralj, Boris Majaron, Eleonore Fröhlich, Maja Ponikvar-Svet, Darko Makovec, Darja Lisjak
Upconverting nanoparticles (UCNPs) of β-NaYF4, co-doped with Yb(3+) and Tm(3+) and 21-36 nm large, were synthesized using a modified thermal decomposition method. The as-synthesized UCNPs were coated with oleic acid and dispersed in nonpolar media. Their morphology, size and crystal structure were analysed with transmission electron microscopy and X-ray diffraction. The UCNPs showed a fluorescence emission spectrum characteristic of Tm(3+). Their dissolution in water (pH ∼ 4-5) and phosphate buffered saline (PBS, pH = 7...
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28512707/geochemistry-and-sources-of-fluoride-and-nitrate-contamination-of-groundwater-in-lar-area-south-iran
#8
Mohsen Rezaei, Masume Nikbakht, Ata Shakeri
Groundwater quality in bone-dry and semiarid areas of Iran is decreasing because of contaminants from natural origins and anthropogenic sources. Among many harmful contaminants, nitrate and fluoride ions are more common. This study was carried out with the aim of determining geochemical processes controlling chemistry of groundwater with special reference to nitrate and fluoride enrichment in groundwater in Lar plain aquifer, south of Iran. Groundwater samples were collected from 17 sites and analyzed for main constituents (Na, K, Ca, Mg, Cl, SO4(2-), HCO3(-), F(-), and NO3(-))...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28508026/fluoride-ion-adsorption-onto-palm-stone-optimization-through-response-surface-methodology-isotherm-and-adsorbent-characteristics-data
#9
Masoumeh Ravanipour, Raheleh Kafaei, Mozhgan Keshtkar, Soghra Tajalli, Narjes Mirzaei, Bahman Ramavandi
In some part of the world, groundwater source can become unsafe for drinking due to the high concentration of fluoride ions [1]. The low cost and facile-produced adsorbent like palm stone could effectively removed fluoride ions through adsorption process. In this dataset, the influence of fluoride ion concentration, solution pH, adsorbent dosage, and contact time on fluoride ion adsorption by palm stones was tested by central composite design (CCD) under response surface methodology (RSM). The data stone carbonized adsorbent was prepared by a simple and facile method at relatively low temperature of 250 °C during 3 h...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28503953/effect-of-deltamethrin-and-fluoride-co-exposure-on-the-brain-antioxidant-status-and-cholinesterase-activity-in-wistar-rats
#10
Adil Mehraj Khan, Rajinder Raina, Nitin Dubey, Pawan Kumar Verma
The study evaluated the effect of commercial preparation of deltamethrin, Butox(®), and fluoride (F(-)) co-exposure on the brain antioxidant status and cholinesterase activity in rats. Group A was untreated. Group B was gavaged Butox(®), providing deltamethrin at the dose rate of 1.28 mg per kg body weight per day. Group C was administered F(-), as NaF, in drinking water providing 20 ppm F(-). Group D received both deltamethrin and F(-) at the same dosages as groups B and C, respectively. Although, glutathione S-transferase activity was induced only in Butox(®) alone treated group, the activities of superoxide dismutase and catalase were inhibited in all treatment groups when compared to the control group...
May 15, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/28502097/oral-health-related-quality-of-life-and-risk-factors-associated-with-traumatic-dental-injuries-in-brazilian-children-a-multilevel-approach
#11
Rafael Aiello Bomfim, Daniel Rodrigo Herrera, Alessandro Diogo De-Carli
Among the diseases related to oral health, such as caries and oral cancer, dental trauma stands out as one of the major public health problems worldwide. The aim of this study was to verify the occurrence of factors associated with traumatic dental injuries (TDI), including oral health-related quality of life (OHRQoL), sociodemographic characteristics, untreated caries, occlusal problems, and contextual variables in 12-year-old Brazilian children METHODS: This study assessed a complex sample of the National Research in Oral Health (SBbrasil 2010) data on 7240 twelve-year-old children and contextual features of the municipalities where they lived RESULTS: TDI prevalence in 12-year-old schoolchildren was 23...
May 14, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28499151/biphenyl-based-stationary-phases-for-improved-selectivity-in-complex-steroid-assays
#12
Johanna M Lindner, Michael Vogeser, Stefanie H Grimm
The measurement of steroid hormones and their corticoid precursors is an important aspect in endocrinology since these analytes are biomarkers for several endocrine disorders. Over the last few years, HPLC-MS/MS has become the method of choice to analyze these compounds. There are already several methods using stationary phases modified with C18 groups. However, since these columns sometimes do not enable sufficient separation of some isobaric steroids, we investigated the potential of a different RP modification using biphenyl groups for the separation of challenging isobars such as corticosterone, 11- and 21-deoxycortisol...
April 19, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28497649/lanthanide-complexes-that-respond-to-changes-in-cyanide-concentration-in-water
#13
Stephen Faulkner, Jack Routledge, Xuejian Zhang, Michael Connolly, Manuel Tropiano, Octavia Blackburn, Alan Kenwright, Paul Beer, Simon Aldridge
Cyanide ions are shown to interact with lanthanide complexes of phenacylDO3A derivatives in aqueous solution, giving rise to changes in the luminescence and NMR spectra. These changes are the consequence of cyanohydrin formation, favoured by the coordination of the phenacyl carbonyl group to the lanthanide centre. These complexes display minimal affinity for fluoride and can detect cyanide at <1 μM concentrations. By contrast, lanthanide complexes with DOTAM derivatives display no affinity for cyanide in water, but respond to changes in fluoride concentration...
May 11, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28497034/comparison-of-fluoride-levels-in-tap-and-bottled-water-and-reported-use-of-fluoride-supplementation-in-a-united-states-mexico-border-community
#14
Kerton R Victory, Nolan L Cabrera, Daniela Larson, Kelly A Reynolds, Joyce Latura, Cynthia A Thomson, Paloma I Beamer
BACKGROUND: Compared to the general United States (U.S.) population, Arizona counties along the U.S.-Mexico border have a higher prevalence of dental caries, which can be reduced with adequate fluoride exposure. Because of concern regarding local tap water quality, fluoride-free bottled water consumption is common in this region, raising concern that families are not receiving adequate fluoride to promote dental health. OBJECTIVE: To evaluate the levels of fluoride in tap and bottled water as well as the use of fluoride supplements in an Arizona border community...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/28496234/water-fluoridation-it-really-is-this-simple
#15
(no author information available yet)
No abstract text is available yet for this article.
May 12, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28493183/geochemical-characterization-of-fluoride-in-water-table-salt-active-sediment-rock-and-soil-samples-and-its-possible-relationship-with-the-prevalence-of-enamel-fluorosis-in-children-in-four-municipalities-of-the-department-of-huila-colombia
#16
Stefania Martignon, Mario Omar Opazo-Gutiérrez, Möritz Velásquez-Riaño, Iván Rodrigo Orjuela-Osorio, Viviana Avila, Esperanza Angeles Martinez-Mier, María Clara González-Carrera, Jaime Alberto Ruiz-Carrizosa, Blanca Cecilia Silva-Hermida
Fluoride is an element that affects teeth and bone formation in animals and humans. Though the use of systemic fluoride is an evidence-based caries preventive measure, excessive ingestion can impair tooth development, mainly the mineralization of tooth enamel, leading to a condition known as enamel fluorosis. In this study, we investigated the geochemical characterization of fluoride in water, table salt, active sediment, rock and soil samples in four endemic enamel fluorosis sentinel municipalities of the department of Huila, Colombia (Pitalito, Altamira, El Agrado and Rivera), and its possible relationship with the prevalence of enamel fluorosis in children...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28489344/in-situ-engineering-toward-core-regions-a-smart-way-to-make-applicable-fef3-carbon-nanoreactor-cathodes-for-li-ion-batteries
#17
Linpo Li, Jianhui Zhu, Maowen Xu, Jian Jiang, Chang Ming Li
Iron fluorides (FeFx) have attracted great interest in Li-ion batteries due to their high theoretical capacity, low cost, and preferable cell safety. However, their practical utilization is severely impeded by inferior electrode kinetics, leading to poor electrode cyclability and rate capabilities. The major bottleneck should be lack of any effective engineering techniques to make reliable encapsulation and conducting matrix on soluble FeFx species. Herein, we propose an applicable synthetic strategy where the massive production of FeF3@carbon nanoreactors (total size: ∼60 nm) can be easily achieved by in situ engineering toward the core regions in hybrids, with the iron rust wastes and common solvents as raw materials...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28487521/efficient-antibacterial-membrane-based-on-two-dimensional-ti3c2tx-mxene-nanosheets
#18
Kashif Rasool, Khaled A Mahmoud, Daniel J Johnson, Mohamed Helal, Golibjon R Berdiyorov, Yury Gogotsi
Advanced membranes that enable ultrafast water flux while demonstrating anti-biofouling characteristics can facilitate sustainable water/wastewater treatment processes. MXenes, two-dimensional (2D) metal carbides and nitrides, have attracted attention for applications in water/wastewater treatment. In this work, we reported the antibacterial properties of micrometer-thick titanium carbide (Ti3C2Tx) MXene membranes prepared by filtration on a polyvinylidene fluoride (PVDF) support. The bactericidal properties of Ti3C2Tx modified membranes were tested against Escherichia coli (E...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28485571/development-of-an-inner-filter-effects-based-upconversion-nanoparticles-curcumin-nanosystem-for-the-sensitive-sensing-of-fluoride-ion
#19
Yan Liu, Qin Ouyang, Huanhuan Li, Zhengzhu Zhang, Quansheng Chen
This paper developed a novel ratiometric fluorescence based sensor for the detection of fluoride ion. Yb(3+), Er(3+) and Tm(3+) co-doped NaYF4 upconversion nanoparticles (UCNPs), which can emit fluorescence at 546 nm, 657 nm, 758 nm and 812 nm under the 980 nm single wavelength excitation, was synthesized, amino-modified and applied as the fluorescent signal indicator. The natural chemical curcumin was served as specific recognition element and mixed with UCNPs to make a nanosystem. In this nanosystem, the absorption peak of curcumin shows bathochromic shift when F(-) was added, causing a upconversion fluorescence quenching at 546 nm and 657 nm through inner filter effects (IFE), while the upconversion emission at 758 nm and 812 nm were essentially unchanged...
May 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28482152/hybrid-li-ion-conducting-membrane-as-protection-for-the-li-anode-in-an-aqueous-li-air-battery-coupling-sol-gel-chemistry-and-electrospinning
#20
Gilles Lancel, Philippe Stevens, Gwenaëlle Toussaint, Manuel Maréchal, Natacha Krins, Damien Bregiroux, Christel Laberty-Robert
Aqueous lithium-air batteries have very high theoretical energy densities, which potentially makes this technology very interesting for energy storage in electric mobility applications. However, the aqueous electrolyte requires the use of a watertight layer to protect the lithium metal, typically a thick NASICON glass-ceramic layer, which adds ohmic resistance and penalizes performance. This article deals with the replacement of this ceramic electrolyte by a hybrid organic-inorganic membrane. This new membrane combines an ionically conducting inorganic phase for Li ion transport (Li1...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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