| http://www.w3.org/ns/prov#value | - Beads which may be employed include cellulose beads, pore-glass beads, silica gel, polystyrene beads, particularly polystyrene beads cross-linked with divinylbenzene, grafted co-polymer beads such as polyethyleneglycol/polystyrene, polyacrylamide beads, latex beads, dimethylacrylamide beads, particularly cross-linked with N,N'-bis-acryloyl ethylene diamine and comprising N-t-butoxycarbonyl-??-alan
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