Optical properties and orientational order of deoxyribonucleic acid molecules at interfaces |
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Authors: | A E Grishchenko A I Kononov L B Naumova B A Dribinskii N A Kas’yanenko |
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Affiliation: | 1.Fock Institute of Physics,St. Petersburg State University,Petrodvorets, St. Petersburg,Russia |
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Abstract: | A high degree of planar orientational order of DNA molecules in thin films has been discovered by the oblique-polarized-beam
method. The coefficients of surface birefringence of films with different thicknesses are measured. The thickness of optically
anisotropic surface layers, which are characterized by macroscopic values higher than the diameter of DNA molecules by three
orders of magnitude in terms of thickness, is determined. A difference in the main polarizabilities of the monomer unit of
DNA, which is estimated for the films, is compared with the corresponding value for the solution measured by flow birefringence.
The effect of temperature on the coefficient of birefringence of the films is examined. A comparison of the data on the native
and denatured DNA shows that the degree of orientational order for the single-helix structure is smaller than that for the
double helix. |
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