Fig. 3
From: Adaptation of a microbial community to demand-oriented biological methanation
Protein profiles of the biological methanation reactor during discontinuous H2-feeding (A) Protein extracts (25 µg) of the third sample were loaded for sodium dodecyl sulphate–polyacrylamide gel electrophoresis. 12/12* shows the experiment with 20% of nominal H2-feeding (BM-12/12–20%). The white dashed lines enclose areas of visible variations in protein profiles. B Principal component analysis (PCA) plot of the 1000 most abundant metaproteins based on the Euclidean similarity index. The PCA plot reflects the development of microbial communities over the experiment period. See details of PCA plot generation in Additional file 4