Figure 6
HAADF-STEM images and EELS microanalysis of magnetosomes after heating until 500 °C and exposure to O2, showing the irregular contrast on magnetosomes and the presence of large cavities. (A) HAADF-STEM image of magnetosomes with cavities. Non-altered regions represented by the red line segment (number 1) and a cavity indicated by the black line segment (number 2) were selected for EELS analysis showed in (B); (B) EELS spectra and relative quantification of regions indicated by red line 1 and black line 2 in (A) for oxygen 540 eV and iron 710 eV; (C) HAADF-STEM image of magnetosomes with cavities. Non-altered regions represented by the red line (number 1) and a cavity indicated by the black line (number 2) were selected for EELS analysis showed in (D); (D) EELS spectra and relative quantification of regions indicated by red line segment 1 and black line segment 2 in (C) for oxygen 540 eV and iron 710 eV.
