Letter
Since it has been established that the dental disease in man known as “mottled enamel” is due to the drinking of water containing fluorine, the removal of fluorides by filtration has become an important problem.
I have found that a contact filter 15 cm high, made of river sand passing a screen 60 to the inch, to which has been added 2 per cent. by weight of powdered aluminium, will remove the fluoride from a solution containing 30 parts per million of sodium fluoride. The absence of fluoride in the filtrate was determined by the zirconium-alizarin colorimetic method.
S.P. Kramer
Ft. Thomas, KY.
*Read letter online at https://science.sciencemag.org/content/80/2086/593.1
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Factors influencing the spatial distribution and individual variation in urinary fluoride levels in Tibet, China
Nowadays, fluorosis is the most prevalent endemic disease in Tibet and one of the most concerned public health problems in China; urinary fluoride is a common diagnostic indicator of endemic fluorosis. However, the spatial distribution and influencing factors of urinary fluoride content in Tibet remain unclear. This study aims to
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New York State and U.S. Federal fluoride pollution standards do not protect cattle health.
Fluoride emissions from an aluminum plant in New York State just west to the bridge to Cornwall, Ontario, Canada, are in compliance with New York State and U.S. Federal standards. Ambient air fluoride virtually never exceeds New York State standards. In a New York State dairy farm, downwind from the
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Dental Fluorosis and Dental Caries.
FOR some 8 or 9 years past the presence of fluorine in water supplies has been attracting much attention, chiefly as a danger and as the cause of endemic dental fluorosis, or mottled enamel, which has been reported in some 300 communities in 23 states of the Union. According to Dean,1
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Dental caries and fluorosis experience of 8-12-year-old children by early-life exposure to fluoride.
BACKGROUND: It is important to evaluate concurrently the benefit for dental caries and the risk for dental fluorosis from early exposure to fluoride among children. AIM: To evaluate associations of different levels of exposure to fluoride in early childhood with dental caries and dental fluorosis experience in school children. METHODS: A Child
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Mechanism of toxic action of fluoride in dental fluorosis: whether trimeric G proteins participate in the disturbance of intracellular transport of secretory ameloblast exposed to fluoride.
In enamel fluorosis model rats treated with sodium fluoride, secretory ameloblasts of incisor tooth germs exhibited disruption of intracellular trafficking. We examined whether heterotrimeric G proteins participated in the disruption of vesicular trafficking of the secretory ameloblast exposed to fluoride, using immunoblotting and pertussis toxin (IAP)-induced adenosyl diphosphate (ADP)-ribosylation for
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