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Agarose gel electrophoresis of crude DNA (H1, I1) and universal PCR (H2, I2) using universal primer set 27f and 1525r. H1 & H2: Procedure H (Tabatabaei). I1 & I2: Procedure I (Tresse). Lane declaration for all crude DNA and universal PCR gel images: lane 1 to 3 activated sludge; lane 4 to 6 Havel River sediment; lane 7 to 9 anaerobic digestion sludge; lane 10 to 12 nitrifying sludge; M in all gel images: 10 kb MassRuler DNA ladder.
