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Dielectric spectroscopy is used to investigate fundamental length scales of146 bp short-fragment (nucleosomal) dilute Na-DNA solutions. Two relaxationmodes are detected: the high- and the low-frequency mode. Dependence of thecorresponding length scales on the DNA and on the (uni-valent) saltconcentration is studied in detail, being different from the case of long,genomic DNA, investigated before. In low added salt regime, the length scale ofthe high-frequency mode scales as the average separation between DNAs, thoughit is smaller in absolute magnitude, whereas the length scale of thelow-frequency mode is equal to the contour length of DNA. These fundamentallength scales in low added salt regime do not depend on whether DNA is in adouble stranded or single stranded form. On the other hand, with increasingadded salt, the characteristic length scale of low-frequency mode diminishes atlow DNA concentrations probably due to dynamical formation of denaturationbubbles and/or fraying in the vicinity of DNA denaturation threshold.

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