| http://www.w3.org/ns/prov#value | - Surface modification: An active ingredient such as a specific polypeptide is deposited on the surface of the membrane 3 through coupling using a diamide, acid anhydride, epoxide or other bifunctional reagent capable of undergoing condensation with ???NH2, ???OH, ???COOH, etc., to form the active surface layer 4 on the surface of the membrane.
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