| http://www.w3.org/ns/prov#value | - In this respect, separator element 20 should preferably be constructed of a hydrophobic, porous material, such as, for example, the hydrophobic, porous non-woven rayon material disclosed in U.S. Pat. No. 4,246,339 or the porous polyethylene or other material which does not bind receptor non-specifically, such as is disclosed in International Publication No. WO85/05451 (International Application No
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