Hydrocarbon chain segmental motion

Figure 8. Schematic of the thermal motion of the upper segments of hydrocarbon chains at the air-water interface. The cones shown by broken lines represent the time-average space occupied by the thermal motion of the segments.

It reduced the segmental motion of lipid molecules especially of the hydrocarbon chains of the lipidf which brough about an increase in the hydrophobic property of the inner region of the liposome bilayer. This hybrid liposome/heme gave a stable oxygen adduct. The incorporation of natural membrane proteins not only physically reinforces the liposome/heme in vitro but also increases its bio-compatibility. 

Here the R 1 values provided in the Supplementary Content (Leftin and Brown 2011) for the (CH2) segments of DLPC and the liquid hydrocarbon -dodecane are compared. Whereas scaling of the relaxation rates for the lipid depends on segmental motion, anisotropic molecular motion, and collective membrane motion, the relaxation rate of the alkane depends on isotropic, fast segmental, and molecular motions only. The frequency dispersion for the liquid is linear with a slope nearly equal to zero at all frequencies. However, for DLPC the slopes of the dispersion depend significantly on temperature. This shows that the phase behavior of the membrane contributes to the structural dynamics observed, and that the rate of the acyl chain motion becomes more like the isotropic alkane with increasing temperature, thereby highlighting the contribution of order fluctuations to... 

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