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Electron paramagnetic resonance spectroscopy was used to examine changes in the distance between two spin-labels on hen egg lysozyme (HEL, 45 Å × 30 Å × 30 Å, 14,600 Da) when interacting with membranes during ultrafiltration (UF). Membranes with nominal molecular weight cutoff (MWCO) values ranging from 10,000 to 300,000 Da were used. Both cellulosic (hydrophilic) and polysulfone (hydrophobic) membranes...
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