Short-fragment Na-DNA dilute aqueous solutions: fundamental length scales and screening

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dc.creatorTomic, S.
dc.creatorBabic, S. Dolanski
dc.creatorIvek, T.
dc.creatorVuletic, T.
dc.creatorKrca, S.
dc.creatorLivolant, F.
dc.creatorPodgornik, R.
dc.date2008-01-31
dc.date.accessioned2026-07-07T09:41:46Z
dc.date.available2026-07-07T09:41:46Z
dc.descriptionDielectric spectroscopy is used to investigate fundamental length scales of 146 bp short-fragment (nucleosomal) dilute Na-DNA solutions. Two relaxation modes are detected: the high- and the low-frequency mode. Dependence of the corresponding length scales on the DNA and on the (uni-valent) salt concentration is studied in detail, being different from the case of long, genomic DNA, investigated before. In low added salt regime, the length scale of the high-frequency mode scales as the average separation between DNAs, though it is smaller in absolute magnitude, whereas the length scale of the low-frequency mode is equal to the contour length of DNA. These fundamental length scales in low added salt regime do not depend on whether DNA is in a double stranded or single stranded form. On the other hand, with increasing added salt, the characteristic length scale of low-frequency mode diminishes at low DNA concentrations probably due to dynamical formation of denaturation bubbles and/or fraying in the vicinity of DNA denaturation threshold.
dc.descriptionAccepted for publication in Europhysics Letters. 5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0801.4885
dc.identifierhttp://arxiv.org/abs/0801.4885
dc.identifierEurophys. Lett. 81, 68003 (2008)
dc.identifierdoi:10.1209/0295-5075/81/68003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/161948
dc.subjectSoft Condensed Matter
dc.titleShort-fragment Na-DNA dilute aqueous solutions: fundamental length scales and screening
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