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

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タイトル: Marked differences in volume phase transitions between gel and single molecule in DNA
著者: Mayama, H. 著作を一覧する
Nakai, T. 著作を一覧する
Takushi, E. 著作を一覧する
Tsujii, K. 著作を一覧する
Yoshikawa, K. 著作を一覧する
発行日: 2007年 7月21日
出版者: American Institute of Physics
誌名: The Journal of Chemical Physics
巻: 127
号: 3
開始ページ: 034901
出版社 DOI: 10.1063/1.2748767
抄録: 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
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 眞山 博幸


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