| http://www.w3.org/ns/prov#value | - Q3 is a reactive group capable of reacting to provide covalent binding to a surface such as an aldehyde group or a silane or siloxane group containing one or more reactive substituents such as halogen, for example chlorine, or alkoxy, generally containing from 1 to 4 carbon atoms, for example methoxy or ethoxy, or, more preferably Q3 is a hydroxyl, amino, carboxyl, epoxy, ???CHOHCH2Hal, (in which
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