DNA fragments obtained from Sau 3AI partially digested total DNA of Bacillus circulans c- 2 were cloned into Bam HI site of pSUPV1, a promoter- probe vector.The recombinantDNA was transformed into Escherichia coli cells and 50 Kan clones were obtained,from which 29clones were randomly picked up for plasmid DNA isolation,The results from agarose gelelectrophoresis and kanamycin-resistant experiment showed that all plasmids contained insertedfragments,and that the highest kanamycin- resistant level was beyo...