Journal ArticleDOI
Dynamics of photoinduced charge transfer and hole transport in synthetic DNA hairpins.
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The dynamics of photoinduced charge separation and charge recombination processes in synthetic DNA hairpins have been investigated by means of femtosecond transient absorption spectroscopy and it is established that these sequences are very shallow hole traps.Abstract:
The dynamics of photoinduced charge separation and charge recombination processes in synthetic DNA hairpins have been investigated by means of femtosecond transient absorption spectroscopy. The driving force and distance dependence of charge-transfer processes involving singlet acceptors and nucleobase donors are consistent with a single-step superexchange mechanism in which the electronic coupling between the donor and acceptor is strongly distance dependent. The dynamics of reversible hole transport between a primary guanine donor and nearby GG or GGG sequences has also been determined and establishes that these sequences are very shallow hole traps.read more
Citations
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About Supramolecular Assemblies of π-Conjugated Systems
Journal ArticleDOI
Direct observation of hole transfer through DNA by hopping between adenine bases and by tunnelling
TL;DR: It is shown experimentally that the rate of charge transfer between two guanine bases decreases with increasing separation only if the guanines are separated by no more than three base pairs; if more bridging base pairs are present, the transfer rates exhibit only a weak distance dependence.
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Radical Initiation in the Class I Ribonucleotide Reductase: Long-Range Proton-Coupled Electron Transfer?
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DNA--metal base pairs.
TL;DR: This review summarizes research which started almost 45 years ago with the investigation of how metal ions interact with unmodified DNA and recently culminated in the development of artificial ligand-like nucleobases so far able to coordinate up to ten metal ions inside a single DNA duplex in a programmable fashion.
Journal ArticleDOI
Electron-transfer state of 9-mesityl-10-methylacridinium ion with a much longer lifetime and higher energy than that of the natural photosynthetic reaction center.
Shunichi Fukuzumi,Hiroaki Kotani,Kei Ohkubo,Seiji Ogo,Nikolai V. Tkachenko,Helge Lemmetyinen +5 more
TL;DR: The electron-transfer state of 9-mesityl-10-methylacridinium ion is achieved by a single step photoinduced electron transfer, which has a much longer lifetime and higher energy than that of the natural system without loss of energy due to multistep electron- transfer processes.
References
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Journal ArticleDOI
Photoinduced electron transfer in supramolecular systems for artificial photosynthesis
Journal ArticleDOI
Emergent Properties of Networks of Biological Signaling Pathways
Upinder S. Bhalla,Ravi Iyengar +1 more
TL;DR: Biochemical signaling networks were constructed with experimentally obtained constants and analyzed by computational methods to understand their role in complex biological processes and raise the possibility that information for "learned behavior" of biological systems may be stored within intracellular biochemical reactions that comprise signaling pathways.
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Oxidative Nucleobase Modifications Leading to Strand Scission
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Direct measurement of electrical transport through DNA molecules
TL;DR: Measurements of electrical transport through individual 10.4-nm-long, double-stranded poly(G)-poly(C) DNA molecules connected to two metal nanoelectrodes that indicate, by contrast, large-bandgap semiconducting behaviour are presented.
Journal ArticleDOI
Intramolecular Long-Distance Electron Transfer in Organic Molecules
Gerhard L. Closs,John R. Miller +1 more
TL;DR: Theoretical predictions of an "inverted region," where increasing the driving force of the reaction will decrease its rate, have begun to be experimentally confirmed and a predicted nonlinear dependence of ET rates on the polarity of the solvent has also been confirmed.