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https://www.readbyqxmd.com/read/28214583/remediation-of-fluoride-from-drinking-water-using-magnetic-iron-oxide-coated-hydrotalcite-chitosan-composite
#1
Kalimuthu Pandi, Soodamani Periyasamy, Natrayasamy Viswanathan
The present study was performed to examine the probability of magnetic iron oxide fabricated hydrotalcite/chitosan (Fe3O4@HTCS) composite for the removal of excess fluoride content from drinking water. The developed Fe3O4@HTCS composite not only demonstrate the good separation ability but also display an extreme enhanced defluoridation capacity (DC) when compared to other base components and composite. The DCs of Fe3O4@HTCS composite, Fe3O4@HT composite, Fe3O4, HT and CS was found to be 5032, 3041, 1050, 1030 and 52 mgF(-)/kg respectively...
February 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28207232/oxidant-induced-high-efficient-mussel-inspired-modification-on-pvdf-membrane-with-superhydrophilicity-and-underwater-superoleophobicity-characteristics-for-oil-water-separation
#2
Chongdan Luo, Qingxia Liu
In this work, a facile one-step approach was developed to modify hydrophobic polyvinylidene fluoride (PVDF) microfiltration membrane with superhydrophilicity and underwater superoleophobicity properties via a high-efficient deposition of polydopamine (PDA) coating oxidized by sodium periodate in a slightly acidic environment (pH = 5.0). In contrast to the traditional PDA coating on hydrophobic membranes autoxidized by O2 in a weak basic buffer solution, the superhydrophilicity and ultra-high pure water permeability (about 11934 L m-2 h-1 under 0...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28199866/improved-pvdf-membrane-performance-by-doping-extracellular-polymeric-substances-of-activated-sludge
#3
Yan-Fang Guan, Bao-Cheng Huang, Chen Qian, Long-Fei Wang, Han-Qing Yu
Polyvinylidene fluoride (PVDF) membrane has been widely applied in water and wastewater treatment because of its high mechanical strength, thermal stability and chemical resistance. However, the hydrophobic nature of PVDF membrane makes it readily fouled, substantially reducing water flux and overall membrane rejection ability. In this work, an in-situ blending modifier, i.e., extracellular polymeric substances (EPS) from activated sludge, was used to enhance the anti-fouling ability of PVDF membrane. Results indicate that the pure water flux of the membrane and its anti-fouling performance were substantially improved by blending 8% EPS into the membrane...
February 8, 2017: Water Research
https://www.readbyqxmd.com/read/28197397/timing-considerations-on-the-shear-bond-strength-of-orthodontic-brackets-after-topical-fluoride-varnish-applications
#4
Gianguido Cossellu, Valentina Lanteri, Andrea Butera, Nicola Laffi, Alberto Merlini, Giampietro Farronato
OBJECTIVES: To assess the best temporal association between the application of a fluoride varnish on enamel and bonding procedures. MATERIALS AND METHODS: Eighty mandibular bovine incisors were used. Teeth were divided into 4 groups (20 per group); Groups 1-3 were treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent, Schaan, Liechtenstein), and Group 4 served as control with no pretreatment. Tooth were stored in deionized water (37°C) and subjected to thermal cycling for 400 (Group 1), 800 (Group 2), and 2500 (Group 3) cycles corresponding, respectively, to 15, 30, and 90 days in order to simulate the three different timing of bracket bonding...
January 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28195340/preventive-benefit-of-access-to-fluoridated-water-for-young-adults
#5
A John Spencer, Pingzhou Liu, Jason Mathew Armfield, Loc Giang Do
: Water fluoridation has been repeatedly associated with lower caries experience in children but uncertainty still exists on strength and extent of the association into adulthood. OBJECTIVE: To analyze the preventive effect of access to fluoridated water on dental caries among young adults. METHODS: In 1991/92 a cross-section of South Australian children aged 5-17 were recruited. Parents provided information on residential history, socioeconomic status, and behaviors...
February 13, 2017: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/28195172/who-water-quality-standards-vs-synergic-effect-s-of-fluoride-heavy-metals-and-hardness-in-drinking-water-on-kidney-tissues
#6
Hewa M S Wasana, Gamage D R K Perera, Panduka De S Gunawardena, Palika S Fernando, Jayasundera Bandara
Despite WHO standards, waterborne diseases among the human being are rising alarmingly. It is known that the prolong exposure to contaminated water has major impact on public health. The effect of chemical contaminations in drinking water on human being is found to be chronic rather than acute and hence can be defined "consumption of contaminated drinking water could be a silent killer". As the WHO recommended water quality standards are only for individual element and synergic effects of trace metals and anions have not been considered, investigation of synergic effects of trace metals and anions and their effect on human being is of prime important research...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193023/electrodialytic-capillary-suppressor-for-open-tubular-ion-chromatography
#7
Weixiong Huang, Purnendu K Dasgupta
We describe an electrodialytic capillary suppressor for suppressed conductometric open tubular ion chromatography (SC-OTIC). For practical eluent concentrations, suppressor active lengths less than ∼1 mm are adequate. In its preferred embodiment, the suppressor consists of a solid polymer ion exchanger block. Two 0.45-mm-diameter parallel cylindrical passages are provided: these provide for passage of regenerant water and placement of platinum wire electrodes. The suppression channel is made by making a crack in the soft polymer block, using a needle 0...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192657/durable-and-hydrophobic-organic-inorganic-hybrid-coatings-via-fluoride-rearrangement-of-phenyl-t12-silsesquioxane-and-siloxanes
#8
David James Krug, Richard M Laine
There have been many successful efforts to enhance the water shedding properties of hydro-phobic and superhydrophobic coatings, but durability is often a secondary concern. Here we de-scribe durable and hydrophobic coatings prepared via fluoride catalyzed rearrangement reaction of dodecaphenylsilsesquioxane [PhSiO1.5]12 (DDPS) with octamethylcyclotetrasiloxane (D4). Hydrophobic properties and wear resistance are maximized by incorporating both low surface energy moieties with crosslinkable moieties into the siloxane network...
February 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28189108/adsorbent-synthesis-of-polypyrrole-tio2-for-effective-fluoride-removal-from-aqueous-solution-for-drinking-water-purification-adsorbent-characterization-and-adsorption-mechanism
#9
Jie Chen, Chiajung Shu, Ning Wang, Jiangtao Feng, Hongyu Ma, Wei Yan
More than 20 countries are still suffering problems of excessive fluoride containing water, and greater than 8mg/L fluoride groundwater has been reported in some villages in China. In order to meet the challenge in the drinking water defluoridation engineering, a high efficiency and affinity defluoridation adsorbent PPy/TiO2 composite was designed and synthetized by in-situ chemical oxidative polymerization. Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction Investigator (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TG), N2 isotherm analysis, Scanning Electron Microscopy (SEM) and Zeta potential analysis were conducted to characterize surface and textural properties of the as-prepared PPy/TiO2, and the possibility of fluoride adsorption was carefully estimated by adsorption isotherm and kinetic studies...
January 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28183611/synergistic-effects-of-proanthocyanidin-tri-calcium-phosphate-and-fluoride-on-artificial-root-caries-and-dentine-collagen
#10
Don Jeevanie Epasinghe, Stephen Kwan, Dora Chu, May Mei Lei, Michael Frances Burrow, Cynthia Kar Yung Yiu
BACKGROUND: Proanthocyanidin has been shown to enhance dentine collagen stability and remineralization of artificial root caries. OBJECTIVES: To evaluate the effect of proanthocyanidin (PA) in combination with tri-calcium phosphate (TCP) and fluoride (F) on resistance to collagen degradation and remineralization of artificial caries lesions. METHODS: Demineralized root fragments (n=75) were randomly divided into five groups based on treatments: (i) 6...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28170338/association-between-vitamin-d-receptor-gene-foki-polymorphism-and-skeletal-fluorosis-of-the-brick-tea-type-fluorosis-a-cross-sectional-case-control-study
#11
Dan Yang, Yang Liu, Yanru Chu, Qing Yang, Wei Jiang, Fuxun Chen, Dandan Li, Ming Qin, Dianjun Sun, Yanmei Yang, Yanhui Gao
BACKGROUND: Brick-tea type fluorosis is a public health concern in the north west area of China. The vitamin D receptor (VDR)-FokI polymorphism is considered to be a regulator of bone metabolism and calcium resorption. However, the association of VDR-FokI polymorphism with the risk of brick-tea type fluorosis has not been reported. MATERIALS AND METHODS: A cross sectional, case control study was conducted in three provinces (Inner Mongolia, Qinghai and Sinkiang) in China...
November 10, 2016: BMJ Open
https://www.readbyqxmd.com/read/28167334/in-vitro-enamel-erosion-and-abrasion-inhibiting-effect-of-different-fluoride-varnishes
#12
Adílis Kalina Alexandria, Thiago Isidro Vieira, Matheus Melo Pithon, Tatiana Kelly da Silva Fidalgo, Andréa Fonseca-Gonçalves, Ana Maria Gondim Valença, Lúcio Mendes Cabral, Lucianne Cople Maia
OBJECTIVE: To investigate the erosion and abrasion inhibiting effect of CPP-ACP/NaF and xylitol/NaF varnishes. METHODS: Bovine enamel samples (n=40) were exposed to the following treatments (n=10): NaF varnish (Duraphat(®), positive control); CPP-ACP/NaF varnish (MI varnishTM); xylitol/NaF (Profluorid(®)) or distilled and deionized water (MilliQ(®), negative control). The samples were submitted for 3days to 4 cycles/day of erosion (5min in Sprite Zero) and 2 cycles of abrasion/day after the first and last erosive challenge, with a toothbrush machine and slurries of a placebo toothpaste for 15s (50 strokes/s)...
January 27, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28160723/a-selective-chemosensor-for-fluoride-ion-and-its-interaction-with-calf-thymus-dna
#13
Soumen Ghosh, Abdulla Al Masum, Aniruddha Ganguly, Md Maidul Islam, Md Akhtarul Alam, Nikhil Guchhait
The amido-Schiff base 1 (N(1), N(3)-bis (2-nitrobenzylidene)benzene-1,3-dicabohydrazide) containing a CONH group and CHN linkage has been synthesized by the condensation between isophthalic acid dihydrazide and o-nitrobenzaldehyde. This molecule can act as a fluoride ion sensor with high selectivity and sensitivity. Presence of nitro group in the phenyl ring may be responsible for the detection of fluoride ion visually with a dramatic color change from colorless to deep red in aqueous dimethyl sulphoxide solution...
January 24, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28157984/high-resolution-fluorescence-bio-imaging-upconversion-nanoparticles-in-insects
#14
Masfer Alkahtani, Yunyun Chen, Julie J Pedraza, Jorge M González, Dilworth Y Parkinson, Philip R Hemmer, Hong Liang
Imaging fluorescent markers with brightness, photostability, and continuous emission with auto fluorescence background suppression in biological samples has always been challenging due to limitations of available and economical techniques. Here we report a new approach, to achieve high contrast imaging inside small and difficult biological systems with special geometry such as fire ants, an important agricultural pest, using a homemade cost-effective optical system. Unlike the commonly used rare-earth doped fluoride nanoparticles, we utilized nanoparticles with a high upconversion efficiency in water...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28152004/prolactin-rs1341239-t-allele-may-have-protective-role-against-the-brick-tea-type-skeletal-fluorosis
#15
Bing-Yun Li, Yan-Mei Yang, Yang Liu, Jing Sun, Yan Ye, Xiao-Na Liu, Hong-Xu Liu, Zhen-Qi Sun, Mang Li, Jing Cui, Dian-Jun Sun, Yan-Hui Gao
OBJECTIVE: Prolactin (PRL) has been reported to be associated with increased bone turnover, and increased bone turnover is also a feature of skeletal fluorosis (SF). Autocrine/paracrine production of PRL is regulated by the extrapituitary promoter and a polymorphism in the extrapituitary PRL promoter at -1149 (rs1341239) is associated with disturbances of bone metabolism in other diseases. Here, we have investigated the possibility that the rs1341239 polymorphism is associated with SF, which results from the consumption of brick tea...
2017: PloS One
https://www.readbyqxmd.com/read/28149475/protective-effect-of-zinc-hydroxyapatite-toothpastes-on-enamel-erosion-an-in-vitro-study
#16
Claudio Poggio, Chiara Gulino, Maria Mirando, Marco Colombo, Giampiero Pietrocola
BACKGROUND: The aim of the present study was to test the impact of different toothpastes with Zinc-Hydroxyapatite (Zn-HAP) on preventing and repairing enamel erosion compared to toothpastes with and without fluoride. MATERIAL AND METHODS: The following four toothpastes were tested: two toothpastes with Zn-HAP, one toothpaste with fluoride and one toothpaste without fluoride. An additional control group was used in which enamel specimens were not treated with toothpaste...
January 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28149456/preventive-effects-of-different-protective-agents-on-dentin-erosion-an-in-vitro-investigation
#17
Claudio Poggio, Chiara Gulino, Maria Mirando, Marco Colombo, Giampiero Pietrocola
BACKGROUND: The purpose of this in vitro study was to evaluate the preventive effects of different protective agents on dentine erosion, measuring mean percentage weight loss. Dissolution of dentine under erosive challenges caused by soft drinks was analyzed: specimens were weighed following each immersion period, with mean percent weight losses calculated. MATERIAL AND METHODS: Extracted teeth were sectioned into uniform slabs. Seventy permanent enamel specimens were randomly distributed to seven groups...
January 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28144801/a-brief-and-critical-review-on-hydrofluorosis-in-diverse-species-of-domestic-animals-in-india
#18
REVIEW
Shanti Lal Choubisa
India is one of the fluoride-endemic countries where the maximum numbers of ground or drinking water sources are naturally fluoridated. In India, a total of 23, out of 36 states and union territories have drinking water contaminated with fluoride in varying concentration. In the present scenario, especially in rural India, besides the surface waters (perennial ponds, dams, rivers, etc.), bore wells and hand pumps are the principal drinking water sources for domestic animals such as cattle (Bos taurus), water buffaloes (Bubalus bubalis), sheep (Ovis aries), goats (Capra hircus), horses (Equus caballus), donkeys (Equus asinus) and dromedary camels (Camelus dromedarius)...
January 31, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28143540/improved-in-vitro-angiogenic-behavior-on-anodized-titanium-dioxide-nanotubes
#19
Ernesto Beltrán-Partida, Benjamín Valdéz-Salas, Aldo Moreno-Ulloa, Alan Escamilla, Mario A Curiel, Raúl Rosales-Ibáñez, Francisco Villarreal, David M Bastidas, José M Bastidas
BACKGROUND: Neovascularization over dental implants is an imperative requisite to achieve successful osseointegration onto implanted materials. The aim of this study was to investigate the effects on in vitro angiogenesis of anodized 70 nm diameter TiO2 nanotubes (NTs) on Ti6Al4V alloy synthesized and disinfected by means of a novel, facile, antibacterial and cost-effective method using super oxidized water (SOW). We also evaluated the role of the surface roughness and chemical composition of materials of materials on angiogenesis...
January 31, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28139487/comparative-evaluation-of-secondary-caries-formation-around-light-cured-fluoride-releasing-restorative-materials
#20
N Sathyajith Naik, V V Subba Reddy, N D Shashikiran
AIM: The aim of this study was to compare and evaluate secondary caries formation around light-cured fluoride-releasing restorative materials. METHODOLOGY: Standard Class V cavities were prepared on the buccal and lingual surfaces of forty extracted healthy premolars. The teeth were randomly divided into four groups of ten teeth each and labeled as Group I, II, III, and IV and restored with one of the following materials, namely, Fuji II LC (Group I), Vitremer (Group II), F-2000 (Group III), and Z-100 (Group IV; Control)...
January 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
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