Urabe T, Asher S A, Pershan P S
Proc Natl Acad Sci U S A. 1981 Aug;78(8):4941-5. doi: 10.1073/pnas.78.8.4941.
Optical birefringence and x-ray measurements are reported for single crystals (0.5 mm X 2 mm X 5 micrometers) of dipalmitoylphosphatidylcholine as a function of temperature and relative humidity. Large single crystals grown in CHCl3/acetone at a low water concentration undergo an irreversible phase transformation at 20 degrees C and 70% relative humidity or at 60 degrees C and 65% relative humidity. After this transformation occurs, the crystals can be made to undergo a reversible transformation into and out of the L alpha phase. The x-ray-determined mosaic spread in the hydrated crystal is less than approximately 0.04 degrees both above and below the main transition.
报道了二棕榈酰磷脂酰胆碱单晶（0.5毫米×2毫米×5微米）的光学双折射和X射线测量结果，作为温度和相对湿度的函数。在低水浓度的CHCl₃/丙酮中生长的大单晶在20℃和70%相对湿度或60℃和65%相对湿度下经历不可逆的相变。这种相变发生后，晶体可以可逆地转变为Lα相和从Lα相转变出来。在主要转变温度之上和之下，水合晶体中由X射线测定的镶嵌角展宽均小于约0.04度。
