Conflicting results for DNA conduction
Figure 4. (a) An image of the metal tip used by Fink and Schönenberger at Basel to probe a DNA bundle connected to a metal electrode on the left. The DNA is the thin strand connected between the electrode and the tip.
(b) The currentvoltage curve measured by the Basel team shows that DNA conducts well and has a resistance of about 1 M ohm.
(c) An arrangement of several single DNA molecules attached between two gold electrodes (top and bottom), as studied by Storm and co-workers at Delft.
(d) The typical currentvoltage curves obtained demonstrate that DNA is an insulator with a resistance greater than 1013 ohm. Note the very different scales in (b) and (d). (Picture credit: John van Noort/TU Delft)