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AParametrizedModel toSimulateCT inDNA
Figure7.5: Transmission function calculatedwith the LandauerâBĂźttikermodel. Av-
eraged transmission function for aMDsimulation of 20ns of a sequence
of three adenines (red) and for themodeledCTparameters (black)
7.4 ChargeTransferExtensions
Inorder tosimulatechargetransferwithnon-adiabaticmulti-scaleschemes, certain
additions to theCTmodelHamiltoniandescribed so far arenecessary.
TheEnvironmentalEffect
Until now, the Hamiltonian was created for "neutral" systems, unaffected by a
charge residing in the system. The introduction of a charge has several effects
on the systemand thereforeon theCTHamiltonian.
Previous work showed that the charge (hole) is stabilized by the polarization of
the surroundingwatermolecules. This canbedescribedas apolaron [96â99]. The
stabilizationcanbeseen in the lowered IPof thenucleobases carryingacharge. To
quantify thedecrease of IP of a chargednucleobase, simulationswith a stationary
charge (hole) introduced into the systemwereperformed. ApolyA sequencewas
equilibratedwitha charge residing completely localizedononenucleobase. Then,
anMDsimulation of 1nswasperformed, and theHamiltonianwas calculated in
every time step. During this simulation, the chargewas restricted to resideonone
nucleobase and did not transfer. The resulting IP time series were recorded for
everynucleobase, andmeanvalueswere calculated. Thesemeanvalues showthat
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Charge Transport in DNA
Insights from Simulations
- Title
- Charge Transport in DNA
- Subtitle
- Insights from Simulations
- Author
- Mario Wolter
- Publisher
- KIT Scientific Publishing
- Date
- 2013
- Language
- English
- License
- CC BY-SA 3.0
- ISBN
- 978-3-7315-0082-7
- Size
- 17.0 x 24.0 cm
- Pages
- 156
- Keywords
- Charge Transport, Charge Transfer, DNA, Molecular Dynamics, Quantum Mechanics
- Categories
- Naturwissenschaften Chemie
Table of contents
- Zusammenfassung 1
- Summary 3
- 1 Introduction 5
- 2 TheoreticalBackground 11
- 3 SimulationSetup 39
- 4 DNAUnderExperimentalConditions 49
- 5 ChargeTransport inStretchedDNA 69
- 6 ChargeTransport inMicrohydratedDNA 79
- 7 AParametrizedModel toSimulateCT inDNA 89
- 8 Conclusion 105
- Appendix 111
- A DNAUnderExperimentalConditions 111
- B CTinMicrohydratedDNA 117
- List ofPublications 137