Total bacteria (16S rDNA) and δ-Proteobacteria [complementary to many iron- and sulfate-reducing genera
including Geobacter, Pelobacter(including fermentative species), Desulfovibrio, Desulfomicrobium, Desulfuromusa,
and Desulfuromonas (including dissimilatory S reducers)] concentration profiles along the inoculated columns fed
synthetic seawater without nitrate (a) or amended nitrate (b). Data obtained after 121 days of continuous water
injection. Nitrate-reducing bacteria were not detected (detection limit was ≥102 gene copies/ mL)