Fig. 9From: Investigation of the optimum conditions for electricity generation by haloalkaliphilic archaeon Natrialba sp. GHMN55 using the Plackett–Burman design: single and stacked MFCsSEM of free and electrode-coating Natrialba sp. GHMN55 after three and six days of incubation. a Free Natrialba sp. GHMN55 cells after three days of incubation, b Free Natrialba sp. GHMN55 cells after six days of incubation, c Archaeal cells–free graphite anodic electrode, and d Archaeal cells–bounded graphite anodic electrodeBack to article page