The utilization of dentifrices with low fluorine concentration, for children under 6 years of age, has been suggested to reduce the risks of dental fluorosis. However, in order to have anticariogenic potential, the dentifrice should form loosely-bound fluorine (CaF2) on dental enamel. Considering that the formation of CaF2 is a function inversely related to pH, dentifrices with pH 5.5, with 275...

In the Centro de Ingeniería Sanitaria a process named ARCIS-UNR was developed for arsenic and fluorine removal from groundwater by means of coagulation with polyaluminium chloride (PACl) and double filtration. A treatment plant for 11,200 inhabitants was designed. During monitoring of the plant it was needed to get more data regarding removal mechanisms and relevant variables in coagulation-ads...

Chocolate bars and chocolate cookies are foodstuffs highly appreciated by children. The possibility of having fluorine (F) among their components, associated with an excessive consumption, may make them decisive contributors to the total daily F intake. Thus, they could participate in the establishment of dental fluorosis. The aim of this study was to analyze the fluorine concentration [F] of t...

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BACKGROUND/AIMS Rubbing the skin may influence the persistence of pustulosis over time. The aim of this study was to assess the impact of a new fabric made with fluorine-synthetic fiber in improving plantar pustulosis. METHODS A total of 17 patients were randomized to receive on one side a sock made of fluorine-synthetic fiber and on the other a sock made of cotton fabric for 4 weeks. The mai...

For various fluorocarbon processing chemistries in an inductively coupled plasma reactor, we have observed relatively thick ~2–7 nm! fluorocarbon layers that exist on the surface during steady state etching of silicon. In steady state, the etch rate and the surface modifications of silicon do not change as a function of time. The surface modifications were characterized by in situ ellipsometry ...

The aim in this project was to synthesize and to study fluorine-18 labeled analogues of l-deprenyl which bind selectively to the enzyme monoamine oxidase B (MAO-B). Three fluorinated l-deprenyl analogues have been generated in multistep organic syntheses. The most promising fluorine-18 compound N-[(2S)-1-[(18)F]fluoro-3-phenylpropan-2-yl]-N-methylprop-2-yn-1-amine (4c) was synthesized by a one-...

Borates M[C6F5BF3] (M = K, Li, Bu4N) react with organolithium compounds, RLi (R = Me, Bu, Ph), in 1,2-dimethoxyethane or diglyme to give M[4-RC6F4BF3] and M[2-RC6F4BF3]. When R is Me or Bu, the nucleophilic substitution of the fluorine atom at the para position to boron is the predominant route. When R = Ph, the ratio M[4-RC6F4BF3]/M[2-RC6F4BF3] is ca. 1:1. Substitution of the fluorine atom at ...

11. GWIRTSMAN, J., R. MAVRODINEAU, AND R. R. COE. 1957. Determination of fluorides in plant tissue, air, and water. Anal Chem. 29: 887-92. 12. HANDLEY, R. AND R. OVERSTREET. 1961. Uptake of calcium and chlorine in roots of Zea mays. Plant Physiol. 36: 766-69. 13. MACINTIRE, W. H. 1951. Report on fluorine. The direct double distillation procedure for the determination of the fluorine content of ...

Ando, et a!., Direct interaction of elemental fluorine with diamond surfaces, Diamond and Related Materials 1996; 5: 1021-1025.* Kealey, et a!., Fluorination of polycrystalline diamond films and powders. An investigation using FTIR spectroscopy, SEM, energyfiltered TEM, XPS and fluorine-IS radiotracer methods, J. Mater. Chern. 2001; 11: 879-886.* Liu, et a!., Functionalization of Nanoscale Diam...