Abstract:As a new DNA fingerprinting technique, denaturing g radient gel electrophoresis (DGGE) was used to analyze the microbial diversity i n different environmental samples, which has given people new ideas of studying the microbial community in soil. This technique is based on the direct extractio n of genomic DNA from soil samples, the amplification of 16S rRNA genes (V3 regi on) by using the specific primers and the separation of the PCR products by DGGE . Three strains (Escherichia coli DH 5α, Staphylococcus ...