تحضير وتشخيص بعض المركبات اللاعضوية ودراسة تاثيرها في فعالية انزيم Laccase المنتج من العزلة الفطرية Pleurotus ostreatus == Synthesis and characterization of some Inorganic compounds and study their Effect in Activity of Laccase produced by fungal isolate Pleurotus ostreatus