Liver: 11 ± 1% (written communication from H. Hansen and P. Bohley, Halle/ Saale, GDR).-Bacteria: 13.7%, cf. Luria, S.E., in: The Bacteria, Vol. I, p. 1 (Gunsalus, I.C., Stanier, R.Y., eds.). New York-London: Academic Press 1960
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The overall thickness of an EPM is 9–10 nm, the thickness of a lipid bilayer roughly half that value. About 1/5 of the bilayer area is occupied by membranespanning protein particles
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For example, bovine pancreas RNase has a mol. weight of 13700 or 22.75×10−21 g, and an estimated particle volume of 17×10−21 cm3, its density therefore being ca. 1.34 g/cm3
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80 S ribosomes: about 0.3 g protein/cm3
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