| http://www.w3.org/ns/prov#value | - A qualitative concentration in the range 0.5-60%, by weight of the composition may also be suitable (see U.S. Pat. No. 5,366,140, the disclosure of which is hereby expressly incorporated herein by reference, particularly column 2, lines 24-28 which describes average densities of about 600-6,000,000 microbeads/cm2, such as 160,000-6,000,000 beads/cm2).
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