Articles you may be interested inFlexibility of phospholipids with saturated and unsaturated chains studied by Raman scattering: The effect of cholesterol on dynamical and phase transitions Amorphous-amorphous transition in glassy polymers subjected to cold rolling studied by means of positron annihilation lifetime spectroscopy Positron-lifetime measurements have been made on the anhydrous crystalline form of DPPC (DL-adipalmitoylphosphatidylcholine) and on bilayer aggregates of 40% water-DPPC systems in the temperature range 23 to 63 ·C. The lifetimes of oops atoms for 40% water-DPPC systems vary slowly with respect to temperature starting before the pretransition temperature of the system. The increase of ooPs lifetime is associated with the pretransition as well as with the main transition of the lipid aggregates. The determination of the phase-transition temperature in terms of the onset temperature and the differential lifetime methods is discussed and compared with the known results obtained by the differential-scanning-calorimetry and the positron Doppler-broadening methods.5836

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