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Ghim, Cheol-Min
Physical Biology & Biological Physics
Research Interests
  • Control of complex networks, Stochastic fluctuations in a cell, Biochemical information processing, Human microbiome, Ecological inference, Nonequilibrium active system

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Orientational dependence of fluctuation-induced interactions in biological membranes

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Title
Orientational dependence of fluctuation-induced interactions in biological membranes
Author
Ghim, Cheol-MinPark, JN
Issue Date
2002-06
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.40, no.6, pp.1077 - 1081
Abstract
We study fluctuation-induced interactions between inclusions, such as membrane proteins, on a fluctuating membrane by using the functional integral formulation. Thermal fluctuations of the membrane are modified by the existence of inclusions, and those modified fluctuations lead to a force between them. Expanding the bending stiffness of membrane inclusions in multipoles and using symmetry to determine the coupling between the inclusion's multipole moments and membrane curvature, we find that the fluctuation-induced interactions fall off as 1/R4 with the separation R. In addition, we obtain a novel behavior for the orientational dependence between noncircular inclusions: For a small ratio of the monopole to the quadrupole moments, the stable configuration is given by θ1 + θ2 = (2n + 1)π/4, where θ1 and θ2 are the angles between the principal axes of inclusions and the separation vector, whereas for large ratio, the free energy is minimized when each angle is respectively (2n + 1)π/4 with n being an integer.
URI
https://scholarworks.unist.ac.kr/handle/201301/7127
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0035998245
DOI
10.3938/jkps.40.1077
ISSN
0374-4884
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PHY_Journal Papers
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