“…The bioengineered aptamers provide some advantages over natural host-guest systems, including higher packing density and improved structural flexibility. Another bio-inspired host-guest system studied extensively is based on molecular imprinting of polymer films (Greene et al, 2005, Levit et al, 2002, Perez et al, 2000, Piletsky et al, 2001, Priego-Capote et al, 2008, Yan et al, 2005, Ye et al, 2000 whereby the polymerization of a polymer is carried out in the presence of guest molecules. The latter are then released from the template, e.g.…”