DNA detection approaches
 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