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A, Characteristic black colonies presenting the likelihood of sulfate-reducing bacteria (SRB). B, polymerase chain reaction (PCR) products from the pure culture showing the presence of Desulfovibrio genus by gel electrophoresis. The PCR product (Lane 3 and 5 showing Desulfovibrio spp specific product size of 135 bp. Lane 7: Positive control and M: 100 bp DNA Ladder.
