Using range-restricted electrons as probes it was possible to show that the catalase of B. megaterium 14581 (ATCC) spores lies just inside a permeability barrier approximately 275 Å thick, the outer limit of which is about 350 Å from the spore's surface. The catalase itself appears to be separated into two fractions by a second barrier to permeability at about 1000 Å from the cell's surface.
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Gerald M. Lefebvre; The Effect of Low-Energy Electron Bombardment on Bacterial Spore Catalase. Radiat Res 1 May 1973; 54 (2): 234–238. doi: https://doi.org/10.2307/3573701
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