http://cmbi.bjmu.edu.cn/news/report/2010/pics/ngs_5.png
Nanopore Sequencing
Nucleic acids driven through a nanopore.
Oxford Nanopore
http://cmbi.bjmu.edu.cn/news/report/2010/pics/ngs_5.png
Differences in conductance of pore provide readout.
This diagram shows a protein nanopore set in an electrically resistant membrane bilayer.  An ionic current is passed through the nanopore by setting a voltage across this membrane.
 
If an analyte passes through the pore or near its aperture, this event creates a characteristic disruption in current. By measuring that current it is possible to identify the molecule in question. For example, this system can be used to distinguish the four standard DNA bases and G, A, T and C, and also modified bases.  It can be used to identify target proteins, small molecules, or to gain rich molecular information for example to distinguish the enantiomers of ibuprofen or molecular binding dynamics.