title: Study of DNA internal dynamics by quasi-elastic light scattering.
abstract: We have studied the large-scale internal fluctuations in DNA coils by using quasi-elastic light-scattering spectroscopy. We have measured the angular dependence of the first cumulant of the scattered-light autocorrelation function. Within the q (3) domain of this dependence, we observed the transition from the asymptotic behavior predicted for good solvents to the asymptotic behavior predicted for ? conditions. This allowed us to determine the screening length of volume interactions in DNA chains. Analysis of the autocorrelation functions by a regularization procedure allowed us to reconstruct the mode composition of the scattered light and to determine the relaxation time of the fluctuations in the coil size.
authors.forename: M A
authors.initials: MA
authors.lastname: Ivanova
authors.forename: A V
authors.initials: AV
authors.lastname: Arutyunyan
authors.forename: A V
authors.initials: AV
authors.lastname: Lomakin
authors.forename: V A
authors.initials: VA
authors.lastname: Noskin