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Insulating Behavior of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>λ</mml:mi></mml:math>-DNA on the Micron Scale
We have investigated the electrical conductivity of lambda-DNA using DNA covalently bonded to Au electrodes. Thiol-modified dTTP was incorporated into the `sticky' ends of bacteriophage lambda-DNA using DNA polymerase. Two-probe measurements on such molecules provide a hard lower bound for the resistivity \rho>10^6 (Ohm cm) at bias potentials up to …