Fig. 2 | Nature Communications

Fig. 2

From: High pCO2-induced exopolysaccharide-rich ballasted aggregates of planktonic cyanobacteria could explain Paleoproterozoic carbon burial

Fig. 2

Cell surface electronegativity and ion retention capacity of S. 8806 cells. a The ζ-potential (mV) of cells suspended in DDW was significantly more negative for the Proterozoic model cultures compared to cultures of the PAL control. The differential ζ-potential in the Proterozoic model cells could be screened by either CaCl2 or MgCl2 solutions but not by NaCl. Data are mean ± s.d., n = 3 (biological replicates). * indicates statistically significant difference as compared to the PAL control (t-test, p < 0.05, Supplementary Table 2). b High cell surface electronegativity conferred cells from the Proterozoic model cultures with capacity to retain more ions compared to cells of the PAL control. Data are mean ± s.d., n = 3 (biological replicates). AFDW ash-free dry weight; * indicates statistically significant difference as compared to the PAL control (t-test, p < 0.05, Supplementary Tables 1 and 3)

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