The experimental studies on the microbial flotation of a pure pyrite sample using Thiobacillus ferrooxidans was conducted in the laboratory.The results indicate
Both pofyanhydrides and polyethers are new types of biodegradble polymers. They are of particular interest as materials for controlled drug release systems duo
By employing different forms and amounts of materials , many kinds of ettringite type expansive agents had been prepared. The relationship between the compositi