Muyzer et al. (1995) used DGGE analysis of PCR-
amplified rDNA fragments to provide information on
the genetic diversity of microbial communities found
around hydrothermal vents. Denaturing gradient gel
electrophoresis of DNA fragments obtained after enzy-
matic amplification of the 16S rDNA using genom-
ic DNA extracted from 2 different hydrothermal vent
samples and bacterial primers, showed only 1 band for