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高等学校化学研究 ›› 2009, Vol. 25 ›› Issue (6): 945-949.

• Articles • 上一篇    下一篇

Biopolymer Entering into and Escaping from a Nanometer Pore

DING Ke-jian1, ZHENG Yan-peng1, GUAN Wei-jun2* and MA Yue-hui2*   

  1. 1. College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China;
    2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China
  • 收稿日期:2008-10-17 修回日期:2009-03-10 出版日期:2009-11-25 发布日期:2010-01-25
  • 通讯作者: MA Yue-hui, E-mail: yuehui.ma@263.net; GUAN Wei-jun, E-mail: wjguan86@iascaas.net.cn
  • 基金资助:

    Supported by the National Natural Science Foundation of China(No.10704007), National Infrastructure of Natural Science and Technology Program(No.2005DKA21101) and the Chinese National Science and Technology Pillar Program for the Eleventh Five-year Plan(No.2006BAD13B08).

Biopolymer Entering into and Escaping from a Nanometer Pore

DING Ke-jian1, ZHENG Yan-peng1, GUAN Wei-jun2* and MA Yue-hui2*   

  1. 1. College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China;
    2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China
  • Received:2008-10-17 Revised:2009-03-10 Online:2009-11-25 Published:2010-01-25
  • Contact: MA Yue-hui, E-mail: yuehui.ma@263.net; GUAN Wei-jun, E-mail: wjguan86@iascaas.net.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.10704007), National Infrastructure of Natural Science and Technology Program(No.2005DKA21101) and the Chinese National Science and Technology Pillar Program for the Eleventh Five-year Plan(No.2006BAD13B08).

Abstract:

We theoretically investigated negative entropy S of biopolymer which passes through a nanometer pore(such as α-hemolysin), especially entering process and escaping process, on the basis of which we also studied biopolymer entering-pore time τent, biopolymer entering mean velocity vent, biopolymer escaping-pore time τesc, and biopolymer escaping mean velocity vesc, respectively. Our results illustrate that the entering and escaping processes of biopolymer depend on its negative entropy, and entering process is more difficult than escaping process for biopolymer translocation. This tremendous difference between the two processes will offer a useful engineering hint for single macromolecule identification.

Key words: Biopolymer; Nanometer pore; Negative entropy; Entering; Escaping