DNA electrochemistry
Agilent,
Motorola, others in use,
not sensitive enough
Nanotube electrochemistry
NASA
Nanowire-based
Lieber,
Williams (HP) 25 pM
Nanoparticle aggregation
Mirkin Nothwestern 100 pM
Cantilever based detection
Guntherodt, Basel, etc 30 pM
Nanopore technologyunproven