FIG. 6.

XRF maps of the qualitative distribution and concentration gradients of manganese and iron in D. radiodurans. Transparent image overlay assembled from XRF microspectroscopy analyses (top) and transmission electron microscopy (not shown) of a single desiccated D. radiodurans diplococcus (22). Depth-average abundance of Mn (green, 200 ppm: 2 mM; dark blue, 150 ppm: 1.5 mM; mauve, 100 ppm: 1 mM; light blue, 50 ppm: 0.5 mM) and Fe (red, 50 ppm: 0.5 mM) are shown [data from ref. (24)]. XRF, X-ray fluorescence.