Cohn G E, Keith A D, Snipes W
Biophys J. 1974 Mar;14(3):178-88. doi: 10.1016/S0006-3495(74)85905-9.
Translational diffusion of the intermediate chain length spin label 7N14 has been detected and studied in a lipid environment which is in the bulk solid state. Under favorable circumstances this can occur at temperatures as much as 50 degrees C below the optical melting point. Translational diffusion allows 7N14 molecules to coalesce into impurity pools of high spin label concentration. Two other spin labels, 2N3 and 14N27, do not show a tendency to form such impurity pools. While 2N3 undergoes rapid tumbling at temperatures far below the melting point of the tristearin matrix, the molecules remain in an isolated state with no evidence of spin exchange. 14N27 is restricted in rotational motion in the solid matrix and also does not form impurity pools.
在处于块状固态的脂质环境中，已检测并研究了中等链长自旋标记物7N14的平移扩散。在有利的情况下，这种扩散可在比光学熔点低多达50摄氏度的温度下发生。平移扩散使7N14分子聚集成高自旋标记物浓度的杂质池。另外两种自旋标记物2N3和14N27没有形成这种杂质池的倾向。虽然2N3在远低于三硬脂酸甘油酯基质熔点的温度下快速翻滚，但分子保持孤立状态，没有自旋交换的迹象。14N27在固体基质中的旋转运动受到限制，也不形成杂质池。
