Unknown

Dataset Information

0

Structure and fluctuations of a single floating lipid bilayer.


ABSTRACT: A single lipid molecular bilayer of 17 or 18 carbon chain phosphocholines, floating in water near a flat wall, is prepared in the bilayer gel phase and then heated to the fluid phase. Its structure (electron density profile) and height fluctuations are determined by using x-ray reflectivity and non-specular scattering. By fitting the off-specular signal to that calculated for a two-dimensional membrane using a Helfrich Hamiltonian, we determine the three main physical quantities that govern the bilayer height fluctuations: The wall attraction potential is unexpectedly low; the surface tension, roughly independent on chain length and temperature, is moderate (approximately 5 x 10(-4) J.m(-2)) but large enough to dominate the intermediate range of the fluctuation spectrum; and the bending modulus abruptly decreases by an order-of-magnitude from 10(-18) J to 10(-19) J at the bilayer gel-to-fluid transition.

SUBMITTER: Daillant J 

PROVIDER: S-EPMC1183447 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC2941019 | biostudies-literature
| S-EPMC4303532 | biostudies-literature
| S-EPMC9279222 | biostudies-literature
| S-EPMC2713560 | biostudies-literature
| S-EPMC2800963 | biostudies-literature
| S-EPMC6304963 | biostudies-literature
| S-EPMC5708646 | biostudies-literature
| S-EPMC4458879 | biostudies-literature
| S-EPMC4124872 | biostudies-literature
| S-EPMC9417616 | biostudies-literature