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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
#1
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
#2
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/28729788/a-comparative-in-vitro-study-on-fluoride-release-and-water-sorption-of-different-flowable-esthetic-restorative-materials
#3
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/28727415/hydrophobic-nanosized-all-silica-beta-zeolite-efficient-synthesis-and-adsorption-application
#4
Zhiguo Zhu, Hao Xu, Jingang Jiang, Hai-Hong Wu, Peng Wu
All-silica Beta zeolite, synthesized by conventional hydroxide route, usually possesses small crystal size of a few hundred nanometers but poor hydrophobicity, whereas the fluoride-mediated one exhibits to be highly hydrophobic but microsized. To obtain nanosized all-silica Beta zeolite with excellent hydrophobicity, an innovative and efficient hydrothermal route via interzeolite transformation for synthesizing all-silica Beta zeolite is proposed in present study. With the assistance of Beta seeds and tetraethylammonium hydroxide as the structure-directing agent, siliceous Beta zeolite is well crystallized at a high solid yield via dissolution-recrystallization of all-silica ITQ-1 crystals at an extremely low water content (H2O/SiO2 molar ratio of 1)...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726224/spatial-scale-and-seasonal-dependence-of-land-use-impacts-on-riverine-water-quality-in-the-huai-river-basin-china
#5
Jianfeng Liu, Xiang Zhang, Bi Wu, Guoyan Pan, Jing Xu, Shaofei Wu
Land use pattern is an effective reflection of anthropic activities, which are primarily responsible for water quality deterioration. A detailed understanding of relationship between water quality and land use is critical for effective land use management to improve water quality. Linear mixed effects and multiple regression models were applied to water quality data collected from 2003 to 2010 from 36 stations in the Huai River basin together with topography and climate data, to characterize the land use impacts on water quality and their spatial scale and seasonal dependence...
July 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28725129/estimation-of-fluoride-concentration-in-drinking-water-and-common-beverages-in-united-arab-emirates-uae
#6
Tarun Walia, Salem Abu Fanas, Madiha Akbar, Jamal Eddin, Mohamad Adnan
OBJECTIVE: To assess fluoride concentration in drinking water which include tap water of 4 emirates - Abu Dhabi, Dubai, Sharjah and Ajman plus bottled water, commonly available soft drinks & juices in United Arab Emirates. METHODS: Five different samples of tap water collected from each of the four emirates of UAE: Ajman, Sharjah, Abu Dhabi and Dubai; twenty-two brands of bottled water and fifteen brands of popular cold beverages, purchased from different supermarkets in U...
July 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/28715617/ionophore-based-anion-selective-optode-printed-on-cellulose-paper
#7
Xuewei Wang, Qi Zhang, Changwoo Nam, Michael Hickner, Mollie Mahoney, Mark Meyerhoff
We report a general anion sensing platform based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a "dry" hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28713433/black-tea-source-production-and-consumption-assessment-of-health-risks-of-fluoride-intake-in-new-zealand
#8
Declan T Waugh, Michael Godfrey, Hardy Limeback, William Potter
In countries with fluoridation of public water, it is imperative to determine other dietary sources of fluoride intake to reduce the public health risk of chronic exposure. New Zealand has one of the highest per capita consumption rates of black tea internationally and is one of the few countries to artificially fluoridate public water; yet no information is available to consumers on the fluoride levels in tea products. In this study, we determined the contribution of black tea as a source of dietary fluoride intake by measuring the fluoride content in 18 brands of commercially available products in New Zealand...
2017: Journal of Environmental and Public Health
https://www.readbyqxmd.com/read/28702918/assessment-of-potential-health-risk-of-fluoride-consumption-through-rice-pulses-and-vegetables-in-addition-to-consumption-of-fluoride-contaminated-drinking-water-of-west-bengal-india
#9
Piyal Bhattacharya, Alok Chandra Samal, Suman Banerjee, Jagadish Pyne, Subhas Chandra Santra
A study was conducted in fluoride-affected Bankura and Purulia districts of West Bengal to assess the potential health risk from fluoride exposure among children, teenagers, and adults due to consumption of rice, pulses, and vegetables in addition to drinking water and incidental ingestion of soil by children. Higher mean fluoride contents (13-63 mg/kg dry weight) were observed in radish, carrot, onion bulb, brinjal, potato tuber, cauliflower, cabbage, coriander, and pigeon pea. The combined influence of rice, pulses, and vegetables to cumulative estimated daily intake (EDI) of fluoride for the studied population was found to be 9...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28702056/prevalence-of-dental-caries-and-fluoride-concentration-of-drinking-water-a-systematic-review
#10
REVIEW
Fatemeh Goodarzi, Amir Hossein Mahvi, Mostafa Hosseini, Ramin Nabizadeh Nodehi, Mohammad Javad Kharazifard, Mina Parvizishad
BACKGROUND: The objective of this study was to systematically review prevalence of dental caries at different water fluoride levels and emphasize fluoride concentration of drinking water and prevalence of dental caries. MATERIALS AND METHODS: A comprehensive study was conducted using PubMed database. Inclusion criteria were predefined and some articles fulfilled these criteria. Study validity was assessed by some checklists. Surveys were conducted to determine prevalence of dental caries among individuals...
May 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28701639/synthesized-mesoporous-silica-and-calcium-aluminate-cement-fillers-increased-the-fluoride-recharge-and-lactic-acid-neutralizing-ability-of-a-resin-based-pit-and-fissure-sealant
#11
Atikom Surintanasarn, Krisana Siralertmukul, Niyom Thamrongananskul
This study evaluated the effect of different types of filler in a resin-based pit and fissure sealant on fluoride release, recharge, and lactic acid neutralization. Resin-based sealant was incorporated with 5% w/w of the following fillers: calcium aluminate cement (CAC), synthesized mesoporous silica (SI), a CAC and SI mixture (CAC+SI), glass-ionomer powder (GIC), and acetic acid-treated GIC (GICA). Sealant without filler served as control. The samples were immersed in deionized water or a lactic acid solution and the concentration of fluoride in the water, before and after fluoride recharge, and the lactic acid pH change, respectively, were determined...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701058/attitudes-and-behavioural-factors-relating-to-toothbrushing-and-the-use-of-fluoride-toothpaste-among-caries-active-swedish-adolescents-a-questionnaire-study
#12
Anna Nordström, Dowen Birkhed
OBJECTIVE: The aim of this study was to identify attitudes and behaviour relating to fluoride toothpaste and toothbrushing habits among caries-active Swedish adolescents. MATERIALS AND METHODS: This cross-sectional study is based on an earlier clinical, two-year toothpaste intervention study. At the last appointment, 206 adolescents (of 211) answered a questionnaire comprising nine semi-closed questions. RESULTS: The majority (93%) brushed their teeth every day, while 7% did so only occasionally...
July 12, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28699676/influence-of-multi-wavelength-laser-irradiation-of-enamel-and-dentin-surfaces-at-0-355-2-94-and-9-4%C3%A2-%C3%AE-m-on-surface-morphology-permeability-and-acid-resistance
#13
Nai-Yuan N Chang, Jamison M Jew, Jacob C Simon, Kenneth H Chen, Robert C Lee, William A Fried, Jinny Cho, Cynthia L Darling, Daniel Fried
OBJECTIVE: Ultraviolet (UV) and infrared (IR) lasers can be used to specifically target protein, water, and mineral, respectively, in dental hard tissues to produce varying changes in surface morphology, permeability, reflectivity, and acid resistance. The purpose of this study was to explore the influence of laser irradiation and topical fluoride application on the surface morphology, permeability, reflectivity, and acid resistance of enamel and dentin to shed light on the mechanism of interaction and develop more effective treatments...
July 12, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28697483/under-oil-superhydrophilic-wetted-pvdf-electrospun-modified-membrane-for-continuous-gravitational-oil-water-separation-with-outstanding-flux
#14
M Obaid, Hend Omar Mohamed, Ahmed S Yasin, Mohamed A Yassin, Olfat A Fadali, HakYong Kim, Nasser A M Barakat
Water in the world is becoming an increasingly scarce commodity and the membrane technology is a most effective strategy to address this issue. However, the fouling and low flux of the polymeric membrane remains the big challenges. Novel modified Polyvinylidene fluoride (PVDF) membrane was introduced, in this work, using a novel treatment technique for an electrospun polymeric PVDF membrane to be used in oil/water separation systems. The Characterizations of the modified and pristine membranes showed distinct changes in the phase and crystal structure of the membrane material as well as the wettability...
June 28, 2017: Water Research
https://www.readbyqxmd.com/read/28695953/triaminoborane-bridged-diphosphine-complexes-with-ni-and-pd-coordination-chemistry-structures-and-ligand-centered-reactivity
#15
Kyounghoon Lee, Courtney M Donahue, Scott R Daly
The synthesis, coordination chemistry, and reactivity of two diphosphines containing the cyclic triaminoborane 1,8,10,9-triazaboradecalin (TBD) are described. To evaluate the ligand-centered reactivity of (Ph)TBDPhos and (iPr)TBDPhos, the complexes ((Ph)TBDPhos)MCl2 and ((iPr)TBDPhos)MCl2, where M = Ni and Pd, were prepared and characterized by elemental analysis, multinuclear NMR spectroscopy ((1)H, (13)C, (31)P, and (11)B), and single-crystal X-ray diffraction (XRD). Despite very low boron Lewis acidity in the TBD backbone, ((Ph)TBDPhos)NiCl2 (1) and ((Ph)TBDPhos)PdCl2 (3) react with H2O, alcohols, and hydrated fluoride reagents in the presence of NEt3 to yield trans H-O or H-F addition across the bridgehead N-B bond...
July 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28694614/environmental-arsenic-contamination-and-its-effect-on-intelligence-quotient-of-school-children-in-a-historic-gold-mining-area-hutti-north-karnataka-india-a-pilot-study
#16
R Manju, Amitha M Hegde, Paul Parlees, Anisha Keshan
CONTEXT: Arsenic is a rare crystal element that naturally occurs in all environmental media. A combination of regional and site-specific biogeochemical and hydrological factors governs its dispersion in the environment. It has far reaching consequences on human health. Exposure to arsenic in drinking water has been associated with a decline in intellectual function in children. AIM: The aim of this study is to assess the relationship between exposure to arsenic by drinking water and children's intelligence in Karnataka state, India...
July 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28689018/optimizing-concentration-of-titanium-tetrafluoride-solution-for-human-dentine-remineralization
#17
Peng Wang, Jianghong Gao, Danyang Wang, Malcolm L Snead, Juedan Li, Jianping Ruan
OBJECTIVE: The aim of the present study was to select the optimal concentration of TiF4 solution to facilitate the remineralization of early dentine caries lesions. DESIGN: Sixty human dentine specimens were cut and randomly divided into 6 groups (1%, 2%, 3%, 4% TiF4 groups, 2.712% NaF group and distilled deionized water (DDW) control group). Artificial dentine caries-like lesions were created. After being subjected to fluoride treatment and immersed in remineralizing solution for 2weeks, the specimens were observed by microCT, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS)...
July 1, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28688368/-hydrous-18-f-fluoroethylation-leaving-off-the-azeotropic-drying
#18
Torsten Kniess, Markus Laube, Jörg Steinbach
The study describes the development of a simple and effective method for (18)F-fluoroethylation -omitting the azeotropic drying step- by elution of a [(18)F]fluoride loaded QMA column with a K2CO3/K222/acetonitrile solution containing 2-3% (v/v) water directly to the 1,2-ethylene glycol-bis-tosylate precursor. In acetonitrile containing 2-3% (v/v) water the labeling agent 2-[(18)F]fluoroethyl tosylate ([(18)F]FETs) was formed in 76-96% non-isolated radiochemical yield. The method was exemplified on the (18)F-fluoroethylation of three COX-2 inhibitors with different core structures...
June 15, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28685565/a-reversible-colorimetric-sensor-for-moisture-detection-in-organic-solvents-and-application-in-ink-less-writing
#19
Pawan Kumar, Rahul Sakla, Amrita Ghosh, D Amilan Jose
Colorimetric sensors based on Sudan- III (1) and Alizarin Red S (2) have been developed for the detection of a trace amount of water in organic solvents such as THF, acetone, acetonitrile and DMSO. The deprotonated (anionic) forms of 1 and 2 such as 1.F and 2.F are re-protonated by using a trace amount of water. Deprotonation of 1 and 2 were obtained by using fluoride anion. Test papers of 1.F and 2.F in organic solvents with and without moisture showed dramatic changes in color. Receptor 1.F exhibits high sensitivity for water in acetone and THF with the detection limit as low as 0...
July 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28680191/influence-of-multi-wavelength-laser-irradiation-of-enamel-and-dentin-surfaces-on-surface-morphology-and-permeability
#20
Nai-Yuan N Chang, Jamison Jew, Jacob C Simon, Kenneth H Chan, Robert C Lee, William A Fried, Jinny Cho, Cynthia L Darling, Daniel Fried
UV and IR lasers can be used to specifically target protein, water, and the mineral phase of dental hard tissues to produce varying changes in surface morphology. In this study, we irradiated enamel and dentin surfaces with various combinations of lasers operating at 0.355, 2.94, and 9.4 μm, exposed those surfaces to topical fluoride, and subsequently evaluated the influence of these changes on surface morphology and permeability. Digital microscopy and surface dehydration rate measurements were used to monitor changes in the samples overtime...
January 28, 2017: Proceedings of SPIE
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