Rhythmic pore dynamics in a shrinking lipid vesicle

Tsutomu Hamada, Yuichi Hirabayashi, Takao Ohta, and Masahiro Takagi
Phys. Rev. E 80, 051921 – Published 24 November 2009
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Abstract

The rhythmic motion of membrane pore behavior under nonequilibrium conditions was studied. Application of the surfactant triton X-100 (TX-100) caused lipid vesicles to exhibit two types of shrinking dynamics with pore generation, which depended on both the size of the vesicles and the concentration of added TX-100. Small vesicles and the addition of a low concentration of TX-100 resulted in rhythmic-pore dynamics, where a transient pore was generated within a vesicle in a repetitive manner. In contrast, large vesicles and a high concentration of TX-100 led to continuous-pore dynamics, where the vesicle maintained an open pore during the shrinking process. In the rhythmic-pore membrane, long-cycle oscillation was observed with large vesicles and a low concentration TX-100. The period of one cycle decreased with a decrease in the vesicle size and an increase in the TX-100 concentration. We discuss the mechanism of these trends by considering the elastic free energy of the membrane.

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  • Received 27 August 2009

DOI:https://doi.org/10.1103/PhysRevE.80.051921

©2009 American Physical Society

Authors & Affiliations

Tsutomu Hamada1,*, Yuichi Hirabayashi1, Takao Ohta2, and Masahiro Takagi1

  • 1School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
  • 2Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

  • *Author to whom correspondence should be addressed; t-hamada@jaist.ac.jp; http://www.jaist.ac.jp/~t-hamada/index.html

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Issue

Vol. 80, Iss. 5 — November 2009

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