Fig. 6From: Optimization of soil microbial fuel cell for sustainable bio-electricity production: combined effects of electrode material, electrode spacing, and substrate feeding frequency on power generation and microbial community diversitya RPCA comparing samples taken on day 0 (control), day 40 (A), and day 90 (B) from the anode and cathode of the S-MFCs at the family level. The arrow vectors show the microbes that most significantly contributed to the observed variations. b Relative abundance of the most diverse microbial groups in the treatments. The patterned bars represent the Comamonadaceae family for the MPP groupBack to article page