The toxic effect of fluorides upon the teeth and bones of animals has been demonstrated. In 1925 McCollum, Simmonds, Becker, and Bunting (1)) also Schulz and Lamb (2)) reported a disturbance in the quality and structure of the teet,h of albino rats, produced by amounts of fluorides only slightly above that occurring in natural foods. Since then the observed harmful effects of the feeding of roc...

The mononuclear Mn(CO)(5)X and binuclear Mn(2)(CO)(8)(μ-X)(2) manganese carbonyl halides have long been known for the halogens Cl, Br, and I. However, the corresponding manganese carbonyl fluorides (X = F) remain unknown. The structures and thermochemistry of such manganese carbonyl fluorides and their decarbonylation products have now been investigated using density functional theory. In all c...

In October 2005, the Australian Research Centre for Population Oral Health (ARCPOH) hosted a Workshop on the Use of Fluorides in Australia. The workshop was attended by 35 experts, university, jurisdictional and peak-body representatives from all states and territories of Australia. ARCPOH hosted the workshop at the request of the National Advisory Committee on Oral Health (NACOH) which had con...

nanocrystals of zno were prepared by microwave irradiation using zn (ii) acetate and triethanol amin (tea) as the starting materials and water as solvent. the nanocrystals of zno with hexagonal (wurtzite) structure were characterized by x-ray powder diffraction (xrd), transmission electron microscopy (tem), scanning electron microscopy (sem), uv-vis absorption and ftir spectroscopy techniques.

The discovery during the first half of the 20th century of the link between natural fluoride, adjusted fluoride levels in drinking water and reduced dental caries prevalence proved to be a stimulus for worldwide on-going research into the role of fluoride in improving oral health. Epidemiological studies of fluoridation programmes have confirmed their safety and their effectiveness in controlli...

The letters to the Editor of the International Journal of Occupational and Environmental Health by Phyllis Mullenix and Donald Taves on setting appropriate safety standards for industrial levels of fluorides and fluorine are considered as if they were a debate. The participants’ views on gaseous fluorides, hydrofluoric acid and particulate fluoride are summarized. It is concluded that in the en...

Actinide nitrides, in particular UN, are being considered as fuel types for advanced reactor systems. Here, we demonstrate a low-temperature synthesis route on uranium that could be developed into a commercial fabrication process for UN and mixed actinide nitride fuels. UN was successfully synthesized from UO2 by first reacting with NH4HF2 in a ball mill at 20 C to form tetravalent ammonium ura...

The fluoride content in the urine, hair, and nails of 106 workers employed in a phosphate fertiliser plant was significantly raised above the control level. Positive correlations were found between the group means for concentrations of fluorides in urine and hair (r = 0.77), urine and nails (r = 0.99), and hair and nails (r = 0.70). Individual values in the whole population gave significant cor...

The KF, sucrose (table sugar) exploited as quenching system in solution phase parallel synthesis. Excess of electrophiles were covalently trapped with hydroxyl functionality of sucrose and due to polar nature of sucrose derivative was solubilize in water. Potassium fluoride used to convert various excess electrophilic reagents such as acid chlorides, sulfonyl chlorides, isocyanates to correspon...

Introduction Recently, /3-disulphones wrere synthesised in high yields from sulphonyl fluorides by interaction with alkylmagnesium bromides [1]. It is assumed that this reaction proceeds through the formation of a monosulphone which undergoes a-metallation followed by further reaction with the sulphonyl fluoride to produce /?-disulphone. Since aromatic sulphones cannot be metallated at the a-po...