PHYSICAL FACTORS INVOLVED IN ULTRASONICALLY INDUCED CHANGES IN LIVING SYSTEMS - .2. AMPLITUDE DURATION RELATIONS AND THE EFFECT OF HYDROSTATIC PRESSURE FOR NERVE TISSUE
PHYSICAL FACTORS INVOLVED IN ULTRASONICALLY INDUCED CHANGES IN LIVING SYSTEMS - .2. AMPLITUDE DURATION RELATIONS AND THE EFFECT OF HYDROSTATIC PRESSURE FOR NERVE TISSUE
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DOI：
10.1121/1.1906774
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发表时间：
1951-01-01
影响因子：
2.4
通讯作者：
WULFF, VJ
中科院分区：
文献类型：
--
作者：
FRY, WJ;TUCKER, D;WULFF, VJ
expts的结果。青蛙在静水压力下的实验表明，空化不是通过在脊髓的腰膨大区域上的超声波辐射产生后腿麻痹的机制中的重要因素。麻痹的最小暴露时间的倒数与声幅之间存在线性关系。这一结果很容易用单因素速率过程来描述。根据实验确定的关系式，表明温度随时间的变化率。不能与观察结果联系起来。根据理论计算得出结论，脊髓中界面处的超声吸收不会导致微小的热区。进一步的工作总结亚麻痹剂量，间隔在不同的时间间隔，表明暴露于亚麻痹剂量的超声波辐射后的恢复过程可能不是时间的单调函数。
The results of expts. with frogs under a hydrostatic pressure demonstrate that cavitation is not an important factor in the mechanism of production of paralysis of the hind legs by ultrasonic irradiation over the lumbar enlargement region of the spinal cord. A linear relation exists between the reciprocal of the minimum exposure time for paralysis and the acoustic amplitude. This result is readily described in terms of a one factor rate process. On the basis of this experimentally determined relation, it is shown that time rate of change of temp. cannot be correlated with the observations. It is concluded on the basis of a theoretical calculation that absorption of ultrasound at interfaces in the spinal cord does not result in minute hot regions. Further work on summation of subparalytic doses, spaced apart at various time intervals, indicates that the recovery process following exposure to a subparalytic dose of ultrasonic radiation may not be a monotonic function of time.