| http://www.w3.org/ns/prov#value | - The core particle of the invention may be made of any material including silica, alumina, albumin, polymers, etc., and be of any size and shape, but are preferably polymeric, spherical, monodisperse (i.e., have polydispersities of ???0.1 ??2 /??2) and from 0.05 to 10.0 microns in size more preferably from 0.25 to 5.0 microns, and most preferably from 0.1 to 1.0 microns in size.
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