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Marked differences in volume phase transitions between gel and single molecule in DNA

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Title: Marked differences in volume phase transitions between gel and single molecule in DNA
Authors: Mayama, H. Browse this author →KAKEN DB
Nakai, T. Browse this author
Takushi, E. Browse this author
Tsujii, K. Browse this author
Yoshikawa, K. Browse this author
Issue Date: 21-Jul-2007
Publisher: American Institute of Physics
Journal Title: The Journal of Chemical Physics
Volume: 127
Issue: 3
Start Page: 034901
Publisher DOI: 10.1063/1.2748767
PMID: 17655457
Abstract: Volume phase transitions of a DNA gel and a single giant DNA chain caused by spermidine3+ (SPD3+) were investigated. The change in volume for the single DNA (V/V0~10−5) was four orders of magnitude greater than that for the DNA gel (~10−1), while the critical SPD3+ concentration for the gel (1.8 mM) was one order of magnitude greater than that of the single DNA (0.12–0.25 mM) at the same pH 6.86. We tried to describe mean-field theories with virial expansion, which is valid for the coil-globule transition of a single polymer chain, for the volume phase transitions to explain the reason why such marked differences appeared. Considering the degree of the ordering of Kuhn segments arising from the gel network structure together with the chain length of cross-linked polymer chains, the volume phase transitions were described and then the significant differences were reproduced quantitatively. We concluded that the network structure plays a significant role in the volume phase transition of the gel. ©2007 American Institute of Physics
Rights: Copyright © 2007 American Institute of Physics
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 眞山 博幸

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