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Extra resources for Biological Horizons in Surface Science
The main conclusions from these studies are listed below. ( a ) Even in the saturated phospholipid, some molecular motion oc- D. 38 Chapman curs in the solid state at room temperature. This is evident from the nuclear magnetic resonance ( N M R ) spectra, and from the IR spectra taken at room temperature and at the boiling point of liquid nitrogen. ( b ) When the phospholipid is heated to higher temperature, it reaches a transition point, a marked endothermic change occurs, and the aliphatic chains "melt" and exhibit a very high degree of molecular motion.
The experimental line width and second moments shown have been discussed in terms of rotational motions of the lipid chain groups. Wide-line PMR studies of phosphatidylcholine-water systems demonstrate the changes in molecular reorientation caused by increasing hydration (Veksli et al, 1969). With dipalmitoyl phosphatidylcholine the various lines which occur in the gel and liquid crystalline phases have been assigned. This system will be a useful model system for studies of membrane systems such as Mycoplasma laidlawii that undergo a phase transition.
This area per surfactant molecule at the highest surface pressure approximates the area of closest packing which the molecules of the surfactant can achieve. It was this area, when determined for different chain length hydrocarbons, that indicated that the molecules were oriented nearly vertical to the surface. Thus, for long-chain alcohols or 2 fatty acids, the area of 20 Â per molecule was obtained independent of the length of the hydrocarbon chain. The explanation was that all the molecules were oriented perpendicular to the surface.
Biological Horizons in Surface Science by L. M. Prince