| http://www.w3.org/ns/prov#value | - In a particularly preferred embodiment, the membrane is a semi-permeable multilayered membrane having at least one layer formed of a nonporous block copolymer having hydrophobic segments (such as silicone polymer segments, aromatic and aliphatic polymer segments, polypropylene oxide segments, polytetra-methylene oxide segments and the like) and hydrophilic segments (such as polyoxyethylene segment
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