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https://www.readbyqxmd.com/read/28106988/factors-governing-the-performance-of-bauxite-for-fluoride-remediation-of-groundwater
#1
Aruna Kirani Katyayani Cherukumilli, Caroline Delaire, Susan E Amrose, Ashok J Gadgil
Globally, 200 million people drink groundwater contaminated with fluoride concentrations exceeding the World Health Organization's recommended level (WHO-MCL =1.5 mg F-/L). This study investigates the use of minimally-processed (dried/milled) bauxite ore as an inexpensive adsorbent for remediating fluoride-contaminated groundwater in resource-constrained areas. Adsorption experiments in synthetic groundwater using bauxites from Guinea, Ghana, USA, and India as single-use batch dispersive media demonstrated that doses of ~10-23 g/L could effectively remediate 10 mg F-/L...
January 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28099871/fluoride-and-arsenic-exposure-affects-spatial-memory-and-activates-the-erk-creb-signaling-pathway-in-offspring-rats
#2
Yu-Peng Zhu, Shu-Hua Xi, Ming-Yan Li, Ting-Ting Ding, Nan Liu, Fu-Yuan Cao, Yang Zeng, Xiao-Jing Liu, Jun-Wang Tong, Shou-Fang Jiang
Fluoride and arsenic are inorganic contaminants that occur in the natural environment. Chronic fluoride and/or arsenic exposure can induce developmental neurotoxicity and negatively influence intelligence in children, although the underlying molecular mechanisms are poorly understood. This study explored the effects of fluoride and arsenic exposure in drinking water on spatial learning, memory and key protein expression in the ERK/CREB signaling pathway in hippocampal and cerebral cortex tissue in rat offspring...
January 15, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28094471/cleanable-air-filter-transferring-moisture-and-effectively-capturing-pm2-5
#3
Xinglei Zhao, Yuyao Li, Ting Hua, Pan Jiang, Xia Yin, Jianyong Yu, Bin Ding
The lethal danger of particulate matter (PM) pollution on health leads to the development of challenging individual protection materials that should ideally exhibit a high PM2.5 purification efficiency, low air resistance, an important moisture-vapor transmission rate (MVTR), and an easy-to-clean property. Herein, a cleanable air filter able to rapidly transfer moisture and efficiently capture PM2.5 is designed by electrospinning superhydrophilic polyacrylonitrile/silicon-dioxide fibers as the adsorption-desorption vector for moisture-vapor, and hydrophobic polyvinylidene fluoride fibers as the repellent components to avoid the formation of capillary water under high humidity...
January 17, 2017: Small
https://www.readbyqxmd.com/read/28092105/effectiveness-of-water-fluoridation-in-the-prevention-of-dental-caries-across-adult-age-groups
#4
Loc Do, Diep Ha, Marco A Peres, John Skinner, Roy Byun, A John Spencer
BACKGROUND: Lifetime access to fluoridated water (FW) is associated with lower caries experience. However, assessing this association in adults is likely affected by age. Cohort stratification and categorization of per cent lifetime access to fluoridated water (% LAFW) within cohorts are current approaches to this assessment. These approaches require an examination of the % LAFW and caries experience variation within and across age groups and their association to inform future analyses...
January 16, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28088154/vibrational-properties-of-anhydrous-and-partially-hydrated-uranyl-fluoride
#5
M C Kirkegaard, J Langford, J Steill, B Anderson, A Miskowiec
Uranyl fluoride (UO2F2) is a hygroscopic powder with two main structural phases: an anhydrous crystal and a partially hydrated crystal of the same R3¯m symmetry. The formally closed-shell electron structure of anhydrous UO2F2 is amenable to density functional theory calculations. We use density functional perturbation theory (DFPT) to calculate the vibrational frequencies of the anhydrous crystal structure and employ complementary inelastic neutron scattering and temperature-dependent Raman scattering to validate those frequencies...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28088117/adsorption-of-phosphate-from-aqueous-solution-using-iron-zirconium-modified-activated-carbon-nanofiber-performance-and-mechanism
#6
Weiping Xiong, Jing Tong, Zhaohui Yang, Guangming Zeng, Yaoyu Zhou, Dongbo Wang, Peipei Song, Rui Xu, Chen Zhang, Min Cheng
Phosphate (P) removal is significant for the prevention of eutrophication in natural waters. In this paper, a novel adsorbent for the removal of P from aqueous solution was synthesized by loading zirconium oxide and iron oxide onto activated carbon nanofiber (ACF-ZrFe) simultaneously. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The results showed that P adsorption was highly pH dependent and the optimum pH was found to be 4...
January 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088017/co-delivery-of-ibuprofen-and-gentamicin-from-nanoporous-anodic-titanium-dioxide-layers
#7
Anna Pawlik, Magdalena Jarosz, Karolina Syrek, Grzegorz D Sulka
Although single-drug therapy may prove insufficient in treating bacterial infections or inflammation after orthopaedic surgeries, complex therapy (using both an antibiotic and an anti-inflammatory drug) is thought to address the problem. Among drug delivery systems (DDSs) with prolonged drug release profiles, nanoporous anodic titanium dioxide (ATO) layers on Ti foil are very promising. In the discussed research, ATO samples were synthesized via a three-step anodization process in an ethylene glycol-based electrolyte with fluoride ions...
January 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28086862/management-of-dentin-hypersensitivity-by-national-dental-practice-based-research-network-practitioners-results-from-a-questionnaire-administered-prior-to-initiation-of-a-clinical-study-on-this-topic
#8
Dorota T Kopycka-Kedzierawski, Cyril Meyerowitz, Mark S Litaker, Sidney Chonowski, Marc W Heft, Valeria V Gordan, Robin L Yardic, Theresa E Madden, Stephanie C Reyes, Gregg H Gilbert
BACKGROUND: Dentin hypersensitivity (DH) is a common problem encountered in clinical practice. The purpose of this study was to identify the management approaches for DH among United States dentists. METHODS: One hundred eighty five National Dental Practice-Based Research Network clinicians completed a questionnaire regarding their preferred methods to diagnose and manage DH in the practice setting, and their beliefs about DH predisposing factors. RESULTS: Almost all dentists (99%) reported using more than one method to diagnose DH...
January 13, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28077305/in-utero-exposure-to-fluoride-and-cognitive-development-delay-in-infants
#9
L Valdez Jiménez, O D López Guzmán, M Cervantes Flores, R Costilla-Salazar, J Calderón Hernández, Y Alcaraz Contreras, D O Rocha-Amador
The objective of this study was to evaluate the association between in utero exposure to fluoride (F) and Mental and Psychomotor Development (MDI and PDI) evaluated through the Bayley Scale of Infant Development II (BSDI-II) in infants. The sample included 65 mother-infant pairs. Environmental exposure to F was quantified in tap and bottled water samples and F in maternal urine was the biological exposure indicator; samples were collected during the 1st, 2nd and 3rd trimester of pregnancy. The mean values of F in tap water for the 1st, 2nd and 3rd trimester were 2...
January 8, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28076495/antimicrobial-activity-of-ozone-and-naf-chlorhexidine-on-early-childhood-caries
#10
Marcos Ximenes, Mariane Cardoso, Fernando Astorga, Roland Arnold, Luiz André Pimenta, Ricardo de Sousa Viera
An early childhood carie (ECC) is an extremely destructive form of tooth decay. The aim of this study was to investigate the action of ozone (O3), and the association of sodium fluoride (NaF) with chlorhexidine (CHX) on bacteria related to ECC. Overnight culture of the bacteria was performed. On exponential phase the suspension was adjusted (101-108 CFU/mL). A drop (10μL) of each concentration of bacteria was applied on sheep blood agar plates and treated with O3 (2, 20, 200, and 2,000 ppm); after 18 hours, recovery analysis of CFU verified the reduction of bacterial activity...
January 5, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28073813/association-between-the-healthy-eating-index-2010-and-nutrient-and-energy-densities-of-german-households-food-purchases
#11
Jonas Peltner, Silke Thiele
BACKGROUND: The USDA Healthy Eating Index (HEI) is used widely to measure diet quality because it allows a number of different applications. Although several evaluations of the HEI-2010 have already been carried out, there is lack of those which focus on associations between the HEI and nutrient intakes. This study updates and expands upon previous findings on these associations. METHODS: Using German consumption data, where ∼12 million purchases from 13 131 households are recorded, HEI-2010 total and individual scores, as well as several energy and nutrient densities were calculated...
January 9, 2017: European Journal of Public Health
https://www.readbyqxmd.com/read/28070588/a-silica-based-sers-chip-for-rapid-and-ultrasensitive-detection-of-fluoride-ions-triggered-by-a-cyclic-boronate-ester-cleavage-reaction
#12
Jian Zhang, Lifang He, Peirong Chen, Chao Tian, Jianping Wang, Bianhua Liu, Changlong Jiang, Zhongping Zhang
Chemical sensing for the convenient detection of trace aqueous fluoride ions (F(-)) has been widely explored with the use of various sensing materials and techniques. It still remains a challenge to achieve ultrasensitive but simple, rapid, and inexpensive detection of F(-) for environmental monitoring and protection. Here we reported a novel surface-enhanced Raman scattering (SERS) nanosensor, fluorescein phenylboronic acid covalently linked to 1,4-dimercapto-2,3-butanediol modified Au@Ag NPs by a cyclic boronate ester (Flu-PBA-Diol-Au@Ag NPs), for the rapid and ultrasensitive detection of F(-)...
January 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28067453/fluoride-anion-complexation-by-a-triptycene-based-distiborane-taking-advantage-of-a-weak-but-observable-c-h%C3%A2-%C3%A2-%C3%A2-f-interaction
#13
Chang-Hong Chen, François P Gabbaï
Fluoride anion complexation impacts a number of areas ranging from sensing to nucleophilic fluorination chemistry. Described here is a new bidentate Lewis acid consisting of two stiborane units connected by a 1,8-triptycenediyl backbone. This neutral derivative captures fluoride with an unprecedented affinity for a neutral, water-compatible Lewis acid. Structural, spectroscopic and computational studies demonstrate that fluoride anion binding is assisted by the formation of a C-H⋅⋅⋅F hydrogen bond which involves a methine group of the 1,8-triptycenediyl backbone...
January 9, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28064417/the-mmp-9-timp-1-system-is-involved-in-fluoride-induced-reproductive-dysfunctions-in-female-mice
#14
Hong-Wei Wang, Wen-Peng Zhao, Pan-Pan Tan, Jing Liu, Jing Zhao, Bian-Hua Zhou
A total of 84 healthy female mice were kept with various concentrations of sodium fluoride (F) (0, 50, 100, 150 mg F(-)/L in drinking water for 90 days) and were then mated with healthy male mice for 1 week to study the effect of excessive fluoride on female reproductive function, particularly in embryo implantation. The rate of pregnancy, litter size, and the birth weight of female mice were evaluated. Ultrastructural changes of uteri tissues were observed by transmission electron microscopy (TEM). The mRNA expression levels of MMP-9 and TIMP-1 were determined by quantitative real-time PCR...
January 7, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28063715/probabilistic-risk-assessment-of-chinese-residents-exposure-to-fluoride-in-improved-drinking-water-in-endemic-fluorosis-areas
#15
Li E Zhang, Daizheng Huang, Jie Yang, Xiao Wei, Jian Qin, Songfeng Ou, Zhiyong Zhang, Yunfeng Zou
Studies have yet to evaluate the effects of water improvement on fluoride concentrations in drinking water and the corresponding health risks to Chinese residents in endemic fluorosis areas (EFAs) at a national level. This paper summarized available data in the published literature (2008-2016) on water fluoride from the EFAs in China before and after water quality was improved. Based on these obtained data, health risk assessment of Chinese residents' exposure to fluoride in improved drinking water was performed by means of a probabilistic approach...
January 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28054272/enhanced-bacterial-affinity-of-pvdf-membrane-its-application-as-improved-sea-water-sampling-tool-for-environmental-monitoring
#16
Sweta Binod Kumar, Preeti Sharnagat, Paramita Manna, Amit Bhattacharya, Soumya Haldar
Isolation of diversified bacteria from seawater is a major challenge in the field of environmental microbiology. In the present study, an attempt has been made to select specific membrane with improved property of attaching diversified bacteria. Initially, different concentrations (15, 18, and 20% W/W) of polysulfone (PSF) were used to check their affinity for the attachment of selected gram-positive (Bacillus subtilis) and gram-negative (Escherichia coli) bacteria. Among these, 20% W/W PSF showed maximum attachment...
January 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28052211/cpp-acp-effect-on-dental-plaque-acidity-after-water-rinsing-following-topical-fluoride-therapy
#17
Mazhari Fatemeh, Sharifi Marjan, Noorollahian Homa, Sharifi Mahsa
OBJECTIVES: There is some evidence that water rinsing immediately after topical fluoride therapy has the potential to reduce the effectiveness of fluoride. The aim was to determine if covering fluoridated teeth with a layer of mousse containing CPP-ACP could prevent the adverse effect of rinsing on fluoride and consequently its buffering effect on dental plaque pH during cariogenic challenge. STUDY DESIGN: This randomized, controlled, crossover, in situ study was conducted on 25 participants...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28050995/anaemia-in-adolescent-girls-an-intervention-of-diet-editing-and-counselling
#18
Andezhath K Susheela, Rashmi Gupta, Nisith K Mondal
BACKGROUND: Though a major public health problem of nutritional anaemia in schoolchildren is being addressed by iron supplementation and/or fortified food, they continue to be anaemic. We aimed to study the effect of fluoride consumption on haemoglobin levels and whether elimination of fluoride from the diet would correct anaemia in children. METHODS: Two hundred and fifty adolescent girls, 10-17 years of age, from a government senior secondary girls school in East Delhi, participated in the programme...
July 2016: National Medical Journal of India
https://www.readbyqxmd.com/read/28042447/effectiveness-of-two-different-desensitizing-varnishes-in-reducing-tooth-sensitivity-a-randomized-double-blind-clinical-trial
#19
G M Nardi, S Sabatini, D Lauritano, F Silvestre, M Petruzzi
PURPOSE: The aim of this study is to evaluate and compare the effectiveness of two different desensitizing varnishes. MATERIALS AND METHODS: Ninety healthy adults suffering from tooth sensitivity were divided into three groups. Two different varnishes were used for the study: Fluor Protector S, containing 7700 ppm fluoride (group I), and Cervitec F, containing 1400 ppm fluoride and 0.3% chlorhexidine (group II). A placebo containing water and ethanol was applied for the third group...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28040586/simultaneous-arsenic-and-fluoride-removal-from-synthetic-and-real-groundwater-by-electrocoagulation-process-parametric-and-cost-evaluation
#20
Lokendra Singh Thakur, Prasenjit Mondal
Co-existence of arsenic and fluoride in groundwater has raised severe health issues to living being. Thus, the present research has been conducted for simultaneous removal of arsenic and fluoride from synthetic groundwater by using electrocoagulation process with aluminum electrode. Effects of initial pH, current density, run time, inter electrode distance and NaCl concentration over percentage removal of arsenic and fluoride as well as operating cost have been studied. The optimum experimental conditions are found to be initial pH: 7, current density: 10 A/m(2), run time: 95 min, inter electrode distance: 1 cm, NaCl concentration: 0...
December 29, 2016: Journal of Environmental Management
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