Fig. 1
From: Iron concentrations in neurons and glial cells with estimates on ferritin concentrations
PIXE spectra of subcellular fractions. Particle induced X-ray emission spectra (charged-normalized) acquired from equal amounts of subcellular brain fractions of a neocortex from one rat. X-ray energy (\(E_{\mathrm {X}}\)) is specific for each element and thus used for elemental identification (\(E_{\mathrm {X}}\) of Fe: K\(_\alpha \)-line: 6.4 keV, \(\hbox {K}_\beta \)-line: 7.1 keV). The PIXE intensity peak area is a measure for the element concentration. The iron concentration of the microsome fraction is much higher than of the other fractions (peak height of \(\approx \)Â 800 vs. \(\approx \)Â 100). The pie chart inset gives the relative contribution of each fraction to the total iron content of the neocortex homogenate