Notice of RetractionA Preliminary Investigation on Microrheological Responses of Short ssDNA in Brownian Motion

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

Microrheological measurements were made to characterize the viscoelastic behavior of short single-stranded DNA (ssDNA) at room temperature using video particle tracking method. The linear shear moduli which consist of the elastic storage modulus (G´) and viscous loss modulus (G´) of ssDNA was obtained. The data show that when the frequency is relatively low(<;10 Hz), G´ is evolved with a rather small value, suggesting ssDNA solution is a kind of viscous fluid during the low frequency regime; however, when the frequency become larger (>;10 Hz), G´ rise abruptly and become comparable to G´, showing an obvious behavior of viscoelasticity. The microrheological responses of short ssDNA seem to be rather different from that of double-stranded DNA (dsDNA) reported in literatures. We suggest that the frequency-dependent microrheological responses of short ssDNA perhaps implicate some novel mechanical property of ssDNA presumable at nanoscale.