NDLI: Verifying scalings for bending rigidity of bilayer membranes using mesoscale models

Content Provider	Royal Society of Chemistry (RSC)
Author	Ayappa, K. G. Kumaran, V. Thakkar, Foram M. Maiti, Prabal K.
Copyright Year	2011
Abstract	The bending rigidity κ of bilayer membranes was studied with coarse grained soft repulsive potentials using dissipative particle dynamics (DPD) simulations. Using a modified Andersen barostat to maintain the bilayers in a tensionless state, the bending rigidity was obtained from a Fourier analysis of the height fluctuations. From simulations carried out over a wide range of membrane thickness, the continuum scaling relation κ ∝ d2 was captured for both the Lα and Lβ phases. For membranes with 4 to 6 tail beads, the bending rigidity in the Lβ phase was found to be 10–15 times higher than that observed for the Lα phase. From the quadratic scalings obtained, a six fold increase in the area stretch modulus, kA was observed across the transition. The magnitude of increase in both κ and kA from the Lα to the Lβ phase is consistent with current experimental observations in lipid bilayers and to our knowledge provides for the first time a direct evaluation of the mechanical properties in the Lβ phase.
Starting Page	3963
Ending Page	3966
Page Count	4
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	7
Issue Number	8
Journal	Soft Matter
DOI	10.1039/c0sm00876a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dissipative particle dynamics Fourier analysis Andersen Lipid
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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