Fig. 3From: Effects of freezing storage on the DNA extraction and microbial evaluation from anaerobic digested sludgesTotal bacteria (triangles) and methanogens (dots) enumeration in the two OFMSW samples, named E sample (grey line) anf F sample (black line). M The quantification of both the microbial targets was performed at regular intervals (meanly every 20 days) in order to monitor the effect of the storage at −20 °C along the timeBack to article page