Anisotropic Electric Conductivity in an Aligned DNA Cast Film

Okahata, Yoshio; Kobayashi, Takuya; Tanaka, Kentaro; Shimomura, Masatsugu

doi:10.1021/ja980165w

Cited by 362 publications

(252 citation statements)

References 10 publications

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“…1,2 Experiments on electric transport through dry and wet DNA molecules revealed a variety of results ranging from proximity-induced superconducting, 3 Ohmic-type, [4][5][6][7] semiconducting, [8][9][10][11][12] and insulating 13,14 behaviors. It is believed that the environment of the molecule, the sequence of nucleotides, and lead effects play an outstanding role in the observed differences.…”

Section: Introductionmentioning

confidence: 99%

Bloch-like oscillations in the Peyrard-Bishop-Holstein model

2008

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The Peyrard-Bishop-Holstein model has been previously introduced as an appropriate framework for the description of polaronic effects for charge migration in DNA. We study numerically the Peyrard-BishopHolstein model when the charge carrier is also subjected to an applied uniform electric field. We find that the polaron undergoes coherent oscillations when the electric field is applied along the stacking direction. The frequency of the oscillations is the same as in the rigid lattice ͑Bloch frequency͒ provided that the carrier-lattice coupling is not large. Increasing the coupling the single peak of the Fourier spectrum splits into side peaks around the Bloch frequency.

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Section: Introductionmentioning

confidence: 99%

Bloch-like oscillations in the Peyrard-Bishop-Holstein model

2008

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“…Experiments on electrical transport through dry and wet DNA molecules revealed a variety of results: DNA has been reported to demonstrate proximity-induced superconducting, 5 metallic, [6][7][8][9] semiconducting, 1,10-13 and insulating 14,15 behavior. The observed differences are believed to be related to contact effects, the environment of the DNA molecule and the sequence of nucleotides.…”

Section: Introductionmentioning

confidence: 99%

Interband optical transitions in DNA-like systems

2007

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The underlying band structure of the uniform DNA suggests the allowance of interband optical transitions. We consider such transitions in the uniform synthetic DNA, such as the poly͑G͒-poly͑C͒ DNA, within a simple tight-binding model with a minimum set of parameters. We demonstrate that the helical conformation of the DNA strands results in unusual interband optical transitions all of which appear to be indirect in k space although the system has a direct band gap energy structure. Simple relationships of the optical gap and absorption linewidth to tight-binding model parameters are found. We study also the effect of disorder in base levels ͑relevant for the wet form of the DNA͒ on interband optical transitions.

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“…Previous studies by direct measurements of electric current in DNA fibers have produced various conclusions from no conductivity [1,2], semi-conductivity [3], good conductivity [4], to superconductivity of a DNA molecule [5]. By appending a photo-oxidant to one end of a DNA duplex and measuring the oxidative damage of a guanine doublet site at various distances, recent biochemical studies of DNA charge transfer have provided more convincing results.…”

Section: Introductionmentioning

confidence: 99%

Stepwise oscillatory circuits of a DNA molecule

2009

J Biol Phys

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A DNA molecule is characterized by a stepwise oscillatory circuit where every base pair is a capacitor, every phosphate bridge is an inductance, and every deoxyribose is a charge router. The circuitry accounts for DNA conductivity through both short and long distances in good agreement with experimental evidence that has led to the identification of the so-called super-exchange and multiple-step hopping mechanisms. However, in contrast to the haphazard hopping and super-exchanging events, the circuitry is a well-defined charge transport mechanism reflecting the great reliability of the genetic substance in delivering electrons. Stepwise oscillatory charge transport through a nucleotide sequence that directly modulates the oscillation frequency may have significant biological implications.

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Anisotropic Electric Conductivity in an Aligned DNA Cast Film

Cited by 362 publications

References 10 publications

Bloch-like oscillations in the Peyrard-Bishop-Holstein model

Bloch-like oscillations in the Peyrard-Bishop-Holstein model

Interband optical transitions in DNA-like systems

Stepwise oscillatory circuits of a DNA molecule

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