FIG. 4.

Comparison of 16S rDNA fragments of the strains isolated with fingerprints of the natural bacterial community in the chemocline by DGGE fingerprinting. Negative images of ethidium bromide-stained gels are shown. (A) Anaerobically isolated strains; (B) aerobically isolated strains. Strains were assigned to species and to genera if sequence identities were >97 and >93%, respectively. Strains marked by shading had 16S rDNA sequences identical to those of band A1, A2, or A7. CFB-group, Cytophaga-Flexibacter-Bacteroides group.