植物组织中的[1H]自旋回波核磁共振。I. 锰（II）和小麦叶片含水量的影响
[1H]Spin-echo nuclear magnetic resonance in plant tissue. I. The effect of Mn(II) and water content in wheat leaves.
作者信息
van As H, van Vliet W P, Schaafsma T J
出版信息
Biophys J. 1980 Dec;32(3):1043-9. doi: 10.1016/S0006-3495(80)85035-1.
Abstract
The effect of age-dependent Mn(II)-gradients, as observed by electron paramagnetic resonance (EPR), on the [1H]NMR spin-spin relaxation time (T2) was studied in wheat leaves. A non-exponential T2 spin-echo decay was always observed, revealing the presence of at least two different fractions of non- (or slowly) exchanging water in the leaves. No effect of the Mn(II)-concentration on T2 of the separate water fractions (covering approximately 90% of the total water content) has been found. From these observations we conclude that Mn(II) is present in bound form. The dependence of T2 on water content can be explained with a two-state model, demonstrating the occurrence of fast exchange within each of the two slowly exchanging water fractions.
摘要
通过电子顺磁共振（EPR）观察到的年龄依赖性锰（II）梯度对小麦叶片中[1H]核磁共振自旋-自旋弛豫时间（T2）的影响进行了研究。总是观察到非指数型T2自旋回波衰减，这表明叶片中存在至少两种不同比例的非（或缓慢）交换水。未发现锰（II）浓度对单独水组分（占总含水量约90%）的T2有影响。从这些观察结果我们得出结论，锰（II）以结合形式存在。T2对含水量的依赖性可以用双态模型来解释，这表明在两个缓慢交换水组分中的每一个内部都发生了快速交换。
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