Fig. 4From: Isolation of axenic cyanobacterium and the promoting effect of associated bacterium on axenic cyanobacteriumEffects of heterotroph-cyanobacterium ratio on axenic Microcystis 905A (a, b, c and d showed the initial cyanobacterial cell number of 3.0 × 102, 3.0 × 103, 3.0 × 104 and 3.0 × 105 cell mL− 1, respectively). * and ** represented a statistically significant difference of p < 0.05 and p < 0.01 when compared to the controlBack to article page