Figure 6.

(a) Normalized Mn K-edge XANES spectra of control bacteria, bacteria grown in a Mn supplemented medium (Mn-bacteria) and magnetosomes isolated from Mn-bacteria (Mn-magnetosomes). (b) Mn K-edge normalized XANES spectra of Mn-bacteria and the control together with Mn references: ${\text{MnO}}_2$ (${\text{Mn}}^{4+}$), ${\text{Mn}}_2{\text{O}}_3$ (${\text{Mn}}^{3+}$), MnO (${\text{Mn}}^{2+}$). (c) Comparison of the XANES spectra of Mn-bacteria and ${\text{Mn}}_3{({\text{PO}}_4)}_2$ and (d) Mn-magnetosomes and ${\text{Mn}}_{0.5}{\text{Fe}}_{2.5}{\text{O}}_4$²³. The inset in (d) highlights the edge position of the Mn-magnetosomes with respect to the references