Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.248102
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Funding
- National Institute of General Medical Sciences of the National Institutes of Health [R01GM44976]
- National Science Foundation (NSF)
- NIH/NIGMS under NSF [DMR-0936384]
- Cornell High Energy Synchrotron Source (CHESS)
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Recent simulations have indicated that the traditional model for topographical fluctuations in biomembranes should be enriched to include molecular tilt. Here we report the first experimental data supporting this enrichment. Utilizing a previously posited tilt-dependent model, a height-height correlation function was derived. The x-ray scattering from a liquid crystalline stack of oriented fluid phase lipid bilayers was calculated and compared with experiment. By fitting the measured scattering intensity, both the bending modulus K-c = 8.3 +/- 0.6 x 10(-20) J and the tilt modulus K-theta = 95 +/- 7 mN/m were determined for DOPC lipid bilayers at 30 degrees C.
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