Hydration dynamics of oriented DNA films investigated by time-domain terahertz spectroscopy

The B to A conformational transition of highly oriented DNA films due to a hydration change is observed with time-domain terahertz spectroscopy. Wet-spun films of calf thymus and salmon DNA are investigated for different film thicknesses and for different polarizations of the terahertz radiation relative to the DNA orientation. A clear polarization dependence is observed. Asynchronous optical sampling allows recording of terahertz absorption and background spectra in a few 10 s, permitting the tracking of the dehydration dynamics on a time scale of minutes. The observation of a phase transition is corroborated by Raman spectroscopy.

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KISTNER, Caroline, Alexander ANDRÉ, Theo FISCHER, Arne THOMA, Christof JANKE, Albrecht BARTELS, Thomas GISLER, Georg MARET, Thomas DEKORSY, 2007. Hydration dynamics of oriented DNA films investigated by time-domain terahertz spectroscopy. In: Applied Physics Letters. 2007, 90, 233902. Available under: doi: 10.1063/1.2743401

BibTex

@article{Kistner2007Hydra-4673,
  year={2007},
  doi={10.1063/1.2743401},
  title={Hydration dynamics of oriented DNA films investigated by time-domain terahertz spectroscopy},
  volume={90},
  journal={Applied Physics Letters},
  author={Kistner, Caroline and André, Alexander and Fischer, Theo and Thoma, Arne and Janke, Christof and Bartels, Albrecht and Gisler, Thomas and Maret, Georg and Dekorsy, Thomas},
  note={Article Number: 233902}
}

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    <dcterms:abstract xml:lang="eng">The B to A conformational transition of highly oriented DNA films due to a hydration change is observed with time-domain terahertz spectroscopy. Wet-spun films of calf thymus and salmon DNA are investigated for different film thicknesses and for different polarizations of the terahertz radiation relative to the DNA orientation. A clear polarization dependence is observed. Asynchronous optical sampling allows recording of terahertz absorption and background spectra in a few 10 s, permitting the tracking of the dehydration dynamics on a time scale of minutes. The observation of a phase transition is corroborated by Raman spectroscopy.</dcterms:abstract>
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