Fig. 1From: Effects of freezing storage on the DNA extraction and microbial evaluation from anaerobic digested sludgesTotal bacteria (triangles) and methanogens (dots) in the four fresh and frozen sample types. Black and grey colours indicate DNA extraction from fresh sample (first extraction) and from 10 days-frozen storage samples, respectively. (A samples input secondary WWTP sludge; B samples output secondary WWTP sludge; C samples input mixed WWTP sludge; D samples output mixed WWTP sludge)Back to article page