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CHAPTER7
AParametrizedModel toSimulateCT inDNA
In this chapter, aparametrizedmodel for the charge transfer inDNAispresented.
Asshowninthepreviouschapters, theCTinDNAissensitive toseveralquantities:
theelectronic couplings (EC), the ionizationpotentials (IP) and the influenceof the
environment. In the shownQM/MMsetup, theseparameters are obtainedwith a
combinationof classicalMDsimulationsandQCcalculations. Bothof these canbe
very timeconsuming,particularlywhen it comes to largesystemsizesorextended
periodsof time.
The idea of the parametrized approach is tomodel these parameterswithout the
need of MM or QC calculations. To do so, data acquired from QM/MM simu-
lations are analyzed extensively in order tomodel the CT quantitieswith simple
algorithms. As a first step, the EC and IP are parametrized and an appropriate
Hamiltonian ismodeled, which already can be used in charge transport calcula-
tions in theLandauer–Büttikerpicture. Thenext step is to include theenvironmen-
tal effects in themodel approach.
Here, the charge is introduced into the CT model, and the resulting polaron is
modeled. Relaxationeffects of the environment are taken intoaccount inaddition.
Finally, first test calculations of the charge transfer in theDNAsequenceGAGare
performed.
89
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