| http://www.w3.org/ns/prov#value | - d passes and, thus, contacts the porous medium. [0012] A similar approach is described in U.S. Pat. No. 5,639,376 which discloses a filter for removing leukocytes and a viral inactivating agent such as methylene blue, its metabolites and photodecomposition products, from plasma or other blood fractions.
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