Alias, M .F., Hashim, A.J ., AND Kareem, T . A .. " Synthesis and Characterization of Some Inorganic Compounds and Study their Effect in activity of Laccase Produced by Fungal isolate Pleurotus ostreatus" Ibn AL- Haitham Journal For Pure and Applied Science [Online], Volume 21 Number 2 (22 September 2017)