Magnetization of circular DNA.
We investigate the orbital magnetization of DNA molecules in the relaxed circular structure. It is shown that DNA of homogeneous sequence exhibits paramagnetic responses to external magnetic fields and, surprisingly, the magnetism of circular DNA is equivalent to that of linear DNA. This turns out to result from the fact that the electron population is localized largely on one of the strands. More intriguingly, the magnetic susceptibility is observed to depend on the ring topology defined by the linking number. We also consider sequence heterogeneity and find that the magnetization displays characteristic oscillations, the pattern of which depends crucially on the sequence and the base content.
Department of Physics, Pusan National University, Busan 609-735, Korea.
Seongjin
S
Kim
Juyeon
J
Yi
M Y
MY
Choi
D003198:Computer Simulation; D004270:DNA, Circular / Q000737:chemistry* / Q000648:ultrastructure*; D008280:Magnetics; D008956:Models, Chemical; D008958:Models, Molecular
D004270:DNA, Circular