Corrosive Effect of Wood Ash Produced by Biomass Combustion on Refractory Materials in a Binary Al-Si System.

In terms of its chemical composition, biomass is a very complex type of fuel. Its combustion leads to the formation of materials such as alkaline ash and gases, and there is evidence of the corrosive effect this process has on refractory linings, thus shortening the service life of the combustion unit. This frequently encountered process is known as "alkaline oxidative bursting".

[Prevalence of mineralization disorders in dental tissues in children in fluoridated regions of Kladno].

The authors subjected to dental examinations a group of children aged 12-13 years from the Kladno area and surrounding rural communities. The children from Kladno drank from birth fluoridated water from the water mains, while the rural children, where well water had a minimum fluoride content, had to rely on sodium fluoride tablets. In all children the prevalence of non-carious changes of dental tissues was assessed, the cariosity (DMF), oral hygiene (OHI) and the state of the gingiva (PI).