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Fluoridation

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https://www.readbyqxmd.com/read/28922027/further-evidence-of-how-unbuffered-starvation-at-4%C3%A2-c-influences-listeria-monocytogenes-egd-e-hcc23-f2365-and-scott-a
#1
Nathan A Jarvis, Corliss A O'Bryan, Elizabeth M Martin, Steven C Ricke, Michael G Johnson, Philip G Crandall
The soilborne pathogen Listeria monocytogenes frequently contaminates food products and food processing environments and is able to survive desiccation, high osmotic pressures, and starvation. However, little is known about how this pathogen survives starvation at 4°C. This study provides evidence that L. monocytogenes is able to survive total nutrient starvation for 4 weeks. L. monocytogenes strains EGD-e, Scott A, F2365, and HCC23 were starved individually in sterile water. Colony counts declined over 4 weeks, with Scott A declining the most rapidly...
September 18, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28921710/non-stick-properties-of-thin-film-coatings-on-dental-restorative-instruments
#2
Jarmo Leppäniemi, Sasha Hoshian, Kimmo Suomalainen, Toni Luoto, Ville Jokinen, Jari Koskinen
The non-stick properties of thin-film coatings on dental-restorative instruments were investigated by static contact-angle measurement using dental filler resin as well as by scanning electron microscopy of the amount of sticking dental restorative material. Furthermore, using a customized dipping measurement set-up, non-stick properties were evaluated by measuring force-by-time when the instrument was pulled out of restorative material. Minor improvements in non-stick properties were obtained with commercial diamond-like carbon and commercial polytetrafluoroethylene-based coatings...
September 18, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28921703/poly-vinylidene-fluoride-co-chlorotrifluoroethylene-modification-via-organocatalyzed-atom-transfer-radical-polymerization
#3
Xin Hu, Yajun Zhang, Guopeng Cui, Ning Zhu, Kai Guo
To address the challenge of metal contamination, a "graft from" approach via organocatalyzed atom transfer radical polymerization (O-ATRP) is developed to synthesize poly(vinylidene fluoride-co-chlorotrifluoroethylene) (P(VDF-co-CTFE)) graft copolymers. N-phenylphenothiazine is utilized as a model organic photoredox catalyst for catalyzing the (co)polymerization of methyl methacrylate (MMA), methacrylate (MA), and n-butyl acrylate (BA). By employing this technique, high temporal control of polymerization and graft content are achieved...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28921685/four-year-incidence-rate-and-predictors-of-root-caries-among-community-dwelling-south-brazilian-older-adults
#4
Augusto B Bidinotto, Aline B Martins, Camila M Dos Santos, Fernando N Hugo, Juliana B Hilgert, Roger Keller Celeste, Dalva Maria Padilha, Renato José De Marchi
OBJECTIVE: This study aimed to assess the incidence density (ID) of new root caries lesions and restorations among community-living south Brazilian older adults and to assess its association with predictor variables. METHODS: We conducted a prospective cohort with a random sample of elders from the municipality of Carlos Barbosa, in south Brazil. Trained dentists performed interviews and oral examinations in 388 individuals at baseline, of which 273 were retained at follow-up 4 years later...
September 18, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28920187/sub-ablative-er-cr-ysgg-laser-irradiation-under-all-ceramic-restorations-effects-on-demineralization-and-shear-bond-strength
#5
Serdar Bağlar
This study evaluated the caries resistant effects of sub-ablative Er,Cr:YSGG laser irradiation alone and combined with fluoride in comparison with fluoride application alone on enamel prepared for veneer restorations. And also, evaluated these treatments' effects on the shear bond strength of all-ceramic veneer restorations. One hundred and thirty-five human maxillary central teeth were assigned to groups of 1a-control, 1b-laser treated, 1c-fluoride treated, 1d-laser + fluoride treated for shear bond testing and to groups of 2a-positive control(non-demineralised), 2b-laser treated, 2c-fluoride treated, 2d-laser + fluoride treated, 2e-negative control (demineralised) for microhardness testing (n = 15, N = 135)...
September 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28918635/optimization-of-the-determination-method-for-dissolved-cyanobacterial-toxin-bmaa-in-natural-water
#6
Boyin Yan, Zhiquan Liu, Rui Huang, Yongpeng Xu, Dongmei Liu, Tsair-Fuh Lin, Fuyi Cui
There is a serious dispute on the existence of β-N-methylamino-L-alanine (BMAA) in water, which is a neurotoxin that may cause Amyotrophic lateral sclerosis/Parkinson's disease (ALS/PDC) and Alzheimer' disease. It is believed that a reliable and sensitive analytical method for the determination of BMAA is urgently required to resolve this dispute. In the present study, the solid phase extraction (SPE) procedure and the analytical method for dissolved BMAA in water were investigated and optimized. The results showed both derivatized and underivatized methods were qualified for the measurement of BMAA and its isomer in natural water, and the limit of detection and the precision of the two methods were comparable...
September 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28918527/alterations-in-epididymal-proteomics-and-antioxidant-activity-of-mice-exposed-to-fluoride
#7
Zilong Sun, Sujuan Li, Yuxiang Yu, Hongyu Chen, Mohammad Mehdi Ommati, Ram Kumar Manthari, Ruiyan Niu, Jundong Wang
It is well known that high fluoride results in low fertility. Epididymis is the important place for spermatozoa maturation, which is essential for successful fertilization. In the previous studies, fluoride was reported to damage the epididymal structure of mouse and rabbit. However, the mechanism underlying sodium fluoride (NaF)-induced epididymal toxicity has not yet been well elucidated. The aim of this study is to explore the global protein alterations in epididymis of mice exposed to NaF using the iTRAQ technique...
September 16, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28918449/immunochemical-study-of-the-effect-of-f2glc-on-glycogen-synthase-translocation-and-glycogen-synthesis-in-isolated-rat-hepatocytes
#8
J M Fernández-Novell, M Díaz-Lobo
The compound 2-deoxy-2-fluoro-α-D-glucopyranosyl fluoride (F2Glc), which is a nonmetabolized superior glucose analogue, is a potent inhibitor of glycogen phosphorylase and pharmacological properties are reported. Glycogen phosphorylase (GP) and glycogen synthase (GS) are responsible of the degradation and synthesis, respectively, of glycogen which is a polymer of glucose units that provides a readily available source of energy in mammals. GP and GS are two key enzymes that modulate cellular glucose and glycogen levels; therefore, these proteins are suggested as potential targets for the treatment of diseases related to glycogen metabolism disorders...
September 16, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28918378/enhanced-fluoride-removal-by-la-doped-li-al-layered-double-hydroxides
#9
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/28918101/silver-diamine-fluoride-remineralized-artificial-incipient-caries-in-permanent-teeth-after-bacterial-ph-cycling-in-vitro
#10
Kulnipa Punyanirun, Thanida Yospiboonwong, Thansinee Kunapinun, Panida Thanyasrisung, Chutima Trairatvorakul
OBJECTIVES: To investigate the remineralizing effect of 38% silver diamine fluoride (SDF) application on enamel artificial caries in adjunct to 1000ppm fluoride toothpaste compared with fluoride toothpaste alone by analyzing the mineral density, depth of remineralization, and remineralization percentage of the lesions. METHODS: Eighteen artificial caries slabs were created from the proximal surfaces of nine chemically demineralized premolars. The slabs were scanned by Micro-Computed Tomography (Micro-CT) to determine the baseline mineral density of the initial lesions and randomly allocated into 2 groups...
September 13, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28917943/chronic-fluoride-exposure-exacerbates-headkidney-pathology-and-causes-immune-commotion-in-clarias-gariepinus
#11
Rashmi Singh, Md Arafat Hussain, Jai Kumar, Manmohan Kumar, Usha Kumari, Shibnath Mazumder
The current study was aimed to understand the effects of chronic fluoride exposure on fish immune system. African sharp tooth catfish (Clarias gariepinus) were exposed to 73.45mg/L of fluoride corresponding to 1/10 96h LC50 for 30 d and the effects on general fish health and several immune parameters were studied. Chronic fluoride exposure led to significant alteration in serum biochemical parameters including alkaline phosphatase, alanine transaminase, aspartate transaminase, triglycerides, cholesterol and blood urea nitrogen levels revealing the detrimental effect of fluoride on general fish health...
September 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28916465/corrosive-effects-of-fluoride-on-titanium-under-artificial-biofilm
#12
Azusa Fukushima, Gen Mayanagi, Keiichi Sasaki, Nobuhiro Takahashi
PURPOSE: This study aimed to investigate the effect of sodium fluoride (NaF) on titanium corrosion using a biofilm model, taking environmental pH into account. METHODS: Streptococcus mutans cells were used as the artificial biofilm, and pH at the bacteria-titanium interface was monitored after the addition of 1% glucose with NaF (0, 225 or 900ppmF) at 37°C for 90min. In an immersion test, the titanium samples were immersed in the NaF solution (0, 225 or 900ppm F; pH 4...
September 12, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28916162/fluoride-concentration-and-amount-of-dentifrice-influence-enamel-demineralization-in-situ
#13
M F Paiva, A C B Delbem, M Danelona, M E Nagata, F R N Moraes, G E G Coclete, R F Cunha, M A R Buzalaf, J P Pessan
OBJECTIVES: This study evaluated the effect of conventional (CD, 1100ppm F) and low-fluoride (LFD, 550ppm F) dentifrices, applied in different quantities, on enamel demineralization, and on fluoride (F) concentrations in the dental biofilm formed in situ. METHODS: Five combinations of dentifrices and quantities were tested: placebo (P-F-free) applied on all brush bristles; LFD applied by the transversal technique (0.3g-T1) or on all bristles (0.6g-T2); and CD applied in a pea-sized amount (0...
September 12, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28915476/microbial-remediation-of-fluoride-contaminated-water-via-a-novel-bacterium-providencia-vermicola-kx926492
#14
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/28914243/an-in-vitro-comparison-of-casein-phosphopeptide-amorphous-calcium-phosphate-paste-casein-phosphopeptide-amorphous-calcium-phosphate-paste-with-fluoride-and-casein-phosphopeptide-amorphous-calcium-phosphate-varnish-on-the-inhibition-of-demineralization-and-promotion
#15
Prachi Jayesh Thakkar, Chandrashekhar M Badakar, Shivayogi M Hugar, Seema Hallikerimath, Punit M Patel, Parin Shah
AIM: This study aims to determine and compare the extent of inhibition of demineralization and promotion of remineralization of permanent molar enamel with and without application of three remineralizing agents. MATERIALS AND METHODS: Forty extracted permanent molars were randomly divided into two groups 1 and 2, longitudinally sectioned into four and divided into subgroups A, B, C, and D. The sections were coated with nail varnish leaving a window of 3 mm × 3 mm...
October 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28914114/shining-dead-bone-cause-for-cautious-interpretation-of-18-f-naf-pet-scans
#16
Magnus Bernhardsson, Olof Sandberg, Marcus Ressner, Jacek Koziorowski, Jonas Malmquist, Per Aspenberg
Background and purpose - [(18)F]Fluoride ([(18)F]NaF) PET scan is frequently used for estimation of bone healing rate and extent in cases of bone allografting and fracture healing. Some authors claim that [(18)F]NaF uptake is a measure of osteoblastic activity, calcium metabolism, or bone turnover. Based on the known affinity of fluoride to hydroxyapatite, we challenged this view. Methods - 10 male rats received crushed, frozen allogeneic cortical bone fragments in a pouch in the abdominal wall on the right side, and hydroxyapatite granules on left side...
September 15, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28913943/bimetallic-co-mn-perovskite-fluorides-as-high-stable-electrode-materials-for-supercapacitors
#17
Wei Shi, Rui Ding, Xudong Li, Qilei Xu, Danfeng Ying, Yongfa Huang, Enhui Liu
Bimetallic Co-Mn perovskite fluorides (KCoxMn1-xF3, denoted as K-Co-Mn-F) with various Co/Mn ratios (1:0, 12:1, 6:1, 3:1, 1:1, 1:3, 0:1) were prepared via one-pot solvothermal strategy and further used as electrode materials for supercapacitors. The optimal K-Co-Mn-F (Co/Mn=6:1) candidate showed size range of 0.1-1 μm and uniform element distribution, exhibiting the light changes in XRD diffraction peaks and XPS binding energy in comparison for the bare K-Co-F and K-Mn-F due to the structural/electronic effects...
September 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28913781/effects-of-fluoride-and-or-sulfur-dioxide-on-morphology-and-dna-integrity-in-rats-hepatic-tissue
#18
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/28913374/comparison-of-the-nutritional-values-of-infant-formulas-available-in-saudi-arabia
#19
Abdulhadi Hesn Almazrooy, Abdulrahman Mohammad Alturki, Afaf Mubarak Aljohani, Abeer Alraddadi, Abdulrahman Muslim Allogmani
Introduction. Optimum growth and development are best achieved by breastfeeding, which is the safest source for infant feeding. Mothers in Saudi Arabia start to breastfeed their infants but soon introduce formula brands. Objective. To assess the safety and nutritional adequacy of the oldest formula brands available in the Saudi market. Methods. An observational study has compared between 5 types of infant formula brands; they were chosen based on their international popularity. Also, they are considered as the oldest formula brands available in the Saudi market...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/28912953/psychological-effects-of-a-disastrous-hydrogen-fluoride-spillage-on-the-local-community
#20
Seung-Hyun Yoo, Seong-Yong Yoon, Kuck-Hyun Woo, Jin-Seok Kim, Seong-Yong Cho, Sung-Soo Lee, Hyun-Sul Lim, Yeon-Soon Ahn, Won-Ho Yang
BACKGROUND: On September 27, 2012, at 3:43 pm, a hydrogen fluoride spill occurred in a manufacturing plant located at the 4th complex of the Gumi National Industrial Complex in Gumi City, South Korea. The present study aimed to evaluate the psychological effects of the hydrogen fluoride spill on the members of the community and to investigate their relationships with physical symptoms and changes in psychological effects occurring as time passed after the accident. METHODS: The 1st phase involved a survey of 1359 individuals that was conducted 1 month after the spill, and the 2nd phase involved a survey of 711 individuals that was conducted 7 months after the accident...
2017: Annals of Occupational and Environmental Medicine
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