【摘要】 <正> 利用质子核磁共振自旋回波波谱仪测定胚胎各个发育阶段的纵向核磁弛豫时间可提供生物样品中能量交换规律的信息。1980年我们曾对蟾蜍及鱼类等动物胚胎进行了研究,取得了纵向弛豫时间T₁在神经管期发生突变的信息,在此基础上,我们对蟾更多还原

【Abstract】 This paper includes two contents, one is to get the relation between the different growing stages of the toad’s embryo and longitudinal relaxation time using the NMR spin echo spectrometer. There is a maximum value of the relaxation time, which is able to give us the very useful information. Another is the effect of the various physical stimulations on the different growing stages of the toad’s embryo. We found that the growing period is reduced after the stimulation in these stages, which have the small relaxation time.更多还原