in addition , the t1 values evaluated at various temperatures in dipalmitoyl phosphatidylcholine vesicles incorporated with either 2h-labeled or unlabeled palmitic acid chains indicated that the average intermolecular contribution to the spin-lattice relaxation rate of the proton groups of the phosphatidylcholine chains appears comparable to the intramolecular term at temperatures moderately higher than tm , but becomes less and less important as the temperature is further increased above the thermal transition .
C0000039
dipalmitoyl phosphatidylcholine
C1959616
phosphatidylcholine