Fig. 2From: Microbial activity response to hydrogen injection in thermophilic anaerobic digesters revealed by genome-centric metatranscriptomicsCH4 yield of the two configurations (a), pH and VFAs trends in R1 (b), R2 (c) and R3 (d), before (phase I) and after (phase II) H2 injection. The orange and green arrows highlight the DNA/RNA sampling points for the single and the two-stage configuration, respectivelyBack to article page