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https://www.readbyqxmd.com/read/28918378/enhanced-fluoride-removal-by-la-doped-li-al-layered-double-hydroxides
#1
Jianguo Cai, Xin Zhao, Yanyang Zhang, Quanxing Zhang, Bingcai Pan
In this study La intercalated Li/Al layered double hydroxide (LDH) was developed for efficient water defluoridation. The La-modified material, i.e., La doped Li/Al-LDH, exhibits more preferable fluoride adsorption than Li/Al-LDH in a broad pH range of 5-9, with the working capacity twice of the latter and seven times of magnitude higher than activated alumina. The fluoride removal kinetics is well fitted by pseudo-second order model, and the adsorption isotherm is well described by Freundlich model. Effect of pH and competing ions was examined during fluoride sequestration...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915476/microbial-remediation-of-fluoride-contaminated-water-via-a-novel-bacterium-providencia-vermicola-kx926492
#2
Shraboni Mukherjee, Priyanka Sahu, Gopinath Halder
The present study emphasizes on the isolation, identification and characterization of a fluoride-resistant bacteria from contaminated groundwater of a severely affected rural area. The isolate was investigated for its possible role towards bioremediation of fluoride. Bacterial growth was determined by various carbon and nitrogen sources. Influence of parameters like initial fluoride concentration (5-25 mg L(-1)), pH (3-9) and temperature (15-42 °C) on fluoride removal by Providencia sp. KX926492 were also examined...
September 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28913781/effects-of-fluoride-and-or-sulfur-dioxide-on-morphology-and-dna-integrity-in-rats-hepatic-tissue
#3
Chen Liang, Yan Gao, Yangfei Zhao, Ram Kumar Manthari, Junjie Ma, Ruiyan Niu, Jinming Wang, Jianhai Zhang, Jundong Wang
This study was aimed to evaluate the toxic effects of fluoride (F) and/or sulfur dioxide (SO2) on morphology and DNA integrity in liver of male rats. For this, 96 Wistar rats (12-week-old) were randomly divided into four groups after 1-week adaptive breeding: the control group, treated with deionized water; the NaF group, administered high F (100 mg NaF/L in the drinking water); the SO2 group, with sulfur dioxide in ambient air (15 ppm SO2, 4 h/day); and NaF + SO2 group, treated with high F and sulfur dioxide together for 8 consecutive weeks...
September 14, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28910727/gene-environment-interaction-does-fluoride-influence-the-reproductive-hormones-in-male-farmers-modified-by-er%C3%AE-gene-polymorphisms
#4
Qiang Ma, Hui Huang, Long Sun, Tong Zhou, Jingyuan Zhu, Xuemin Cheng, Lijv Duan, Zhiyuan Li, Liuxin Cui, Yue Ba
The occurrence of endemic fluorosis is derived from high fluoride levels in drinking water and industrial fumes or dust. Reproductive disruption is also a major harm caused by fluoride exposure besides dental and skeletal lesions. However, few studies focus on the mechanism of fluoride exposure on male reproductive function, especially the possible interaction of fluoride exposure and gene polymorphism on male reproductive hormones. Therefore, we conducted a cross-sectional study in rural areas of Henan province in China to explore the interaction between the estrogen receptor alpha (ERα) gene and fluoride exposure on reproductive hormone levels in male farmers living in the endemic fluorosis villages...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910243/fluoride-exposure-and-reported-learning-disability-diagnosis-among-canadian-children-implications-for-community-water-fluoridation
#5
Amanda M Barberio, Carlos Quiñonez, F Shaun Hosein, Lindsay McLaren
OBJECTIVES: Recent studies have connected increased fluoride exposure with increased risk of neurodevelopmental-related outcomes, such as ADHD (attention deficit hyperactivity disorder) and lower IQ in children. Our primary objective was to examine the association between fluoride exposure and reported diagnosis of a learning disability among a population-based sample of Canadian children aged 3-12 years. METHODS: We analyzed data from Cycles 2 and 3 of the Canadian Health Measures Survey...
September 14, 2017: Canadian Journal of Public Health. Revue Canadienne de Santé Publique
https://www.readbyqxmd.com/read/28904314/effects-of-tannin-fluoride-and-milk-fluoride-mixture-on-human-enamel-erosion-from-inappropriately-chlorinated-pool-water
#6
Sumalee Boonviriya, Sissada Tannukit, Suwanna Jitpukdeebodintra
This in vitro study aimed to investigate the efficacy of tannin-fluoride and milk-fluoride mixtures on human enamel erosion after exposure to inappropriately chlorinated pool water. Enamel specimens were immersed in swimming pool water (pH 2.7) for 30 min and in each test reagent for 4 min once a day for 60 consecutive days (group I: control, group II: tannin-fluoride, group III: milk-fluoride, group IV: tannin-fluoride before and milk-fluoride after erosive challenge, and group V: milk containing tannin-fluoride before and after erosive exposure)...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28902318/prevalence-of-dental-fluorosis-in-mexico-2005-2015-a-literature-review
#7
Fátima Del Carmen Aguilar-Díaz, Federico Morales-Corona, Aline Cristina Cintra-Viveiro, Javier de la Fuente-Hernández
Objective: To perform a literature review regarding current dental fluorosis prevalence in Mexico reported from 2005 to 2015. Materials and methods: A comprehensive scientific literature review, in both English and Spanish, was performed in four databases up to June 2015. Search terms: fluorosis or dental fluorosis (mesh), prevalence (mesh), distribution (mesh), cases (mesh), epidemiology (mesh), Mexico. Results: 17 publications were included...
May 2017: Salud Pública de México
https://www.readbyqxmd.com/read/28900226/a-controllable-and-integrated-pump-enabled-microfluidic-chip-and-its-application-in-droplets-generating
#8
Bei Zhao, Xingye Cui, Wei Ren, Feng Xu, Ming Liu, Zuo-Guang Ye
A microfluidic chip with a controllable and integrated piezoelectric pump was proposed and demonstrated, where the pump was designed as a micro-actuator based on polyvinylidene fluoride (PVDF) organic piezoelectric film. In this case, the pump should integrate with the microfluidics device very well into one chip. The flow rate can be precisely controlled in the range of 0-300 µl/min for water by tuning the Vpp and frequency of Alternating Current (AC) voltage applied on the diaphragm. To analyze the relationship between the flow rate and the deflection of diaphragm, the deformations of diaphragm at different voltages were researched...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898583/electronic-structures-of-small-ruo2-n-n-1-to-4-nanoclusters-and-their-anions-and-the-hydrolysis-reactions-with-water
#9
Zongtang Fang, Michael A Outlaw, David A Dixon
Group 8 (RuO2)n (n= 1 to 4) nanoclusters, their anions and the hydrolysis reactions of the neutral clusters have been studied with the density functional theory (DFT) as well as coupled cluster CCSD(T) theory. The ground state is predicted to be a singlet and a doublet for the neutral RuO2 clusters and anionic clusters, respectively. The CCSD(T) method is required to predict the correct ground state. The calculated singlet-triplet gaps ( < 15 kcal/mol) and fluoride affinities ( < 95 kcal/mol) are smaller than those of the Group 4 (MO2)n and Group 6 (MO3)n metal oxide clusters...
September 12, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28895677/can-babies-oral-wipes-with-fluoride-and-or-calcium-glycerophosphate-prevent-cariogenic-demineralization-an-in-vitro-study
#10
Karla M Rezende, Juliana P Zuim, Thiago S Carvalho, Maria S Côrrea, Marcelo Bönecker
BACKGROUND: The difficulties in reaching a good level of oral hygiene in young babies can be partly overcome with the use of baby oral wipes, which have been shown to effectively remove plaque from deciduous teeth. The presence of fluoride and calcium in these wipes could also prevent further demineralisation of the teeth, as well as promote remineralisation. The aim of this study is, therefore, was to analyze the preventive effect of OW containing F and CaGP on cariogenic demineralization in vitro...
September 12, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28895192/prevalence-and-extent-of-enamel-defects-in-the-permanent-teeth-of-8-year-old-nigerian-children
#11
Olushola Ibiyemi, Fatemeh V Zohoori, Ruth A Valentine, Simon Kometa, Anne Maguire
OBJECTIVES: Enamel formation is a vulnerable developmental process, susceptible to environmental influences such as excessive systemic fluoride (F) exposure and infant/childhood disease. This study determined prevalence and extent of developmental enamel defects (DDE) and dental fluorosis in 8-year-old Nigerians and explored associations with key predictors. METHODS: A sample of 322 healthy 8-year-olds (155 males, 167 females) from primary schools in lower and higher water F areas of (i) rural and (ii) urban parts of Oyo State in south-west Nigeria (n = 4 areas) (in which the mean (SD) F concentration of community water supplies ranged from 0...
September 11, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28891804/detection-of-suspended-nanoparticles-with-near-ambient-pressure-x-ray-photoelectron-spectroscopy
#12
Marit Kjærvik, Anja Hermanns, Paul Dietrich, Andreas Thissen, Stephan Bahr, Benjamin Ritter, Erhard Kemnitz, Wolfgang Unger
Two systems of suspended nanoparticles have been studied with near-ambient pressure XPS: silver nanoparticles in water and strontium fluoride - calcium fluoride core-shell nanoparticles in ethylene glycol. The corresponding dry samples were measured under ultra high vacuum for comparison. The results obtained under near-ambient pressure were overall comparable to those obtained under ultra high vacuum, although measuring silver nanoparticles in water requires a high pass energy and a long acquisition time. A shift towards higher binding energies was found for the silver nanoparticles in aqueous suspension compared to the corresponding dry sample, which can be assigned to a change of surface potential at the water-nanoparticle interface...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28890611/comparison-of-antimicrobial-activity-of-child-formula-dentifrices-at-different-concentrations-an-in-vitro-study
#13
Ritika Malhotra, Shilpy Singla, N D Shashikiran
AIM: The aim of the present in vitro study is to evaluate and compare antimicrobial efficacy of commercially available child's dental formulas in reduced concentrations containing different forms of fluoride against Streptococcus mutans activity. MATERIALS AND METHODS: The selected dentifrices were prepared in dilutions of 1:1, 1:2, 1:4, 1:8, and 1:16 using sterile pyrogen-free distilled water. Various dilutions of the selected toothpaste slurries were incubated in the agar plate containing pure strains of S...
April 2017: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28888861/development-of-nanohybrid-adsorbent-for-defluoridation-from-aqueous-systems
#14
Vicky Dhongde, Kailas L Wasewar, Biswajit S De
The objective of present study is advancement of an efficient nanomaterial which was investigated to substantiate its efficiency, using kinetic studies to ensnare fluoride in order to make water potable. A new crystalline ZrAlCa nanohybrid adsorbent for fluoride removal was successfully synthesized by a co-precipitation method in this study. The prepared adsorbents were characterized by XRD, FT-IR, TGA, BET and FESEM and EDX. The adsorption properties of the developed adsorbent were studied using batch adsorption method which shown the noticeable fluoride removal efficiency up to 99% at near neutral pH as well as in acidic pH range...
September 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28881552/-analysis-on-the-exposure-level-and-geographic-distribution-trend-of-toxicological-indicators-in-rural-drinking-water-shandong-province-in-2015
#15
F Shi, S P Lyu, F L Kong, X T Yang, J Y Zhou
Objective: To analyze the exposure level and the geographical distribution trend of toxicological indicators of rural drinking water in Shandong Province. Methods: The drawing method was used to randomly select no less than 60% villages and towns from 137 counties (cities, districts) of 17 cities in Shandong Province in 2015, and then 1-3 rural centralized water supply units were selected according to the circumstance of rural centralized water supply units in each village and town. In total, 735 villages and towns, 1 473 rural centralized water supply units were selected, and 1 473 water samples were collected...
September 6, 2017: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28881405/fabrication-of-photocontrolled-surfaces-for-oil-water-separation-via-sulfur-vi-fluoride-exchange
#16
Haiguang Zhu, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Hua Wang, Peng Wu, Jian-Mei Lu
Smart surfaces with controllable wettability have attracted substantial interest owing to the potential use of these materials for the separation of oil from oily water caused by frequent oil spill accidents. Because there are few separation materials on the market that are capable of switching between hydrophobicity and hydrophilicity, we report an efficient and low-cost method to fabricate a photoresponsive membrane via the sulfur (VI) fluoride exchange reaction (SuFEx) between poly(4-vinylphenol sulfofluoridate) and (E)-1-(4-(tert-butoxy)phenyl)-2-(4-(trifluoromethoxy)phenyl)diazene...
September 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28872107/soft-lithographic-procedure-for-producing-plastic-microfluidic-devices-with-view-ports-transparent-to-visible-and-infrared-light
#17
Mona Suryana, Jegan V Shanmugarajah, Sivakumar M Maniam, Gianluca Grenci
Infrared (IR) spectro-microscopy of living biological samples is hampered by the absorption of water in the mid-IR range and by the lack of suitable microfluidic devices. Here, a protocol for the fabrication of plastic microfluidic devices is demonstrated, where soft lithographic techniques are used to embed transparent Calcium Fluoride (CaF2) view-ports in connection with observation chamber(s). The method is based on a replica casting approach, where a polydimethylsiloxane (PDMS) mold is produced through standard lithographic procedures and then used as the template to produce a plastic device...
August 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28869054/onsite-defluoridation-system-for-drinking-water-treatment-using-calcium-carbonate
#18
Elaine Y Wong, Michael K Stenstrom
Fluoride in drinking water has several effects on teeth and bones. At concentrations of 1-1.5 mg/L, fluoride can strengthen enamel, improving dental health, but at concentrations above 1.5 to 4 mg/L can cause dental fluorosis. At concentrations of 4-10 mg/L, skeletal fluorosis can occur. There are many areas of the world that have excessive fluoride in drinking water, such as China, India, Sri Lanka, and the Rift Valley countries in Africa. Treatment solutions are needed, especially in poor areas where drinking water treatment plants are not available...
August 28, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28866468/topical-silver-diamine-fluoride-for-dental-caries-arrest-in-preschool-children-a-randomized-controlled-trial-and-microbiological-analysis-of-caries-associated-microbes-and-resistance-gene-expression
#19
Peter Milgrom, Jeremy A Horst, Sharity Ludwig, Marilynn Rothen, Benjamin W Chaffee, Svetlana Lyalina, Katherine S Pollard, Joseph L DeRisi, Lloyd Mancl
OBJECTIVES: The Stopping Cavities Trial investigated effectiveness and safety of 38% silver diamine fluoride in arresting caries lesions. MATERIALS AND METHODS: The study was a double-blind randomized placebo-controlled superiority trial with 2 parallel groups. The sites were Oregon preschools. Sixty-six preschool children with ≥1 lesion were enrolled. Silver diamine fluoride (38%) or placebo (blue-tinted water), applied topically to the lesion. The primary endpoint was caries arrest (lesion inactivity, Nyvad criteria) 14-21days post intervention...
August 30, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28865383/fluoride-concentrations-in-traditional-and-herbal-teas-health-risk-assessment
#20
Suchismita Das, Letuzia M de Oliveira, Evandro da Silva, Yungen Liu, Lena Q Ma
Traditional tea (Camellia sinensis) and herbal tea are being consumed across the world. However, long term consumption of tea can increase the chances of fluorosis owing to the presence of fluoride (F) in teas. Therefore, it is imperative to assess the health risk associated with tea consumption. The main objectives of this study were to: 1) estimate total F in 47 popular teas, including traditional and herbal teas and F concentrations in 1% (w/v) infusion of 5 min, and 2) assess the exposure risks of F from tea consumption in children and adults...
August 30, 2017: Environmental Pollution
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