| http://www.w3.org/ns/prov#value | - The electron acceptor moiety (A1, A2) may be for example the following (a) an aldehyde (???CO???H); (b) a ketone (???CO???R) where R may be for example a straight chain alkyl group having for example 1 to about 20 carbon atoms, particularly 1 to about 12 carbon atoms, such as methyl, ethyl, pentyl, decyl and dodecyl; a branched alkyl group having for example 3 to about 40 carbon atoms, particularl
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