Ferrimagnetic Particles in the Lung Part II: The Relaxation; Process
Ferrimagnetic Particles in the Lung Part II: The Relaxation; Process
复制标题
肺中的亚铁磁性粒子第二部分：放松；
DOI：
10.1109/tbme.1984.325266
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发表时间：
1984
影响因子：
4.6
通讯作者：
S. Arai
中科院分区：
文献类型：
--
作者：
D. Cohen;I. Nemoto;L. Kaufman;S. Arai
在肺中的亚铁磁性颗粒被磁化并通过外部磁场排列，然后被移除，它们经历弛豫。在这个过程中，由排列的粒子在胸部产生的增强磁场随时间减小，通常在第一个小时内减小五倍;这是随机生理脉冲引起的粒子错位的结果。这里的目的是巩固以前的和新的弛豫曲线（减少场与时间），由于Fe 3 O 4颗粒在人肺，并解释曲线。它们被示出为磁化场强度、灰尘在肺中的停留时间、吸烟和呼吸模式的函数。还提供了仓鼠肺中的<$Fe2O3曲线，显示了死亡引起的变化。曲线定性解释相同的物理模型中使用的第一部分，其中单域和多域粒子驻留在粘性流体受到随机脉冲。虽然这里没有直接考虑冲动的生理来源，但曲线表明松弛的原因之一是流体的弹性。此外，这些曲线间接支持了其他人的发现，即冲动的生理来源是巨噬细胞。
After ferrimagnetic particles in the lung have been magnetized and aligned by an external magnetic field which is then removed, they undergo relaxation. In this process the remanent magnetic field at the chest produced by the aligned particles decreases in time, typically by a factor of five in the first hour; this is the result of misalignments of the particles caused by random, physiological impulses. The purpose here is to consolidate previous and new relaxation curves (the decreasing field versus time), due to Fe3O4 particles in the human lung, and to interpret the curves. They are shown as a function of the magnetizing field strength, of the dust residence time in the lung, of smoking, and of the breathing pattern. Curves of ¿Fe2O3 in the hamster lung are also presented, showing the change due to death. The curves are qualitatively explained by the same physics model used in Part I, where single-domain and multidomain particles residing in a viscous fluid are subjected to random impulses. Although the physiological sources of the impulses are not directly considered here, the curves suggest that one cause of relaxation is elasticity of the fluid. Also, the curves indirectly support the findings by others that the physiological sources of the impulses are within macrophages.
磁性氧化铁颗粒在兔肺中的行为与吞噬作用的相关性。
影响因子：
1.7
作者：
Brain,JD;Bloom,SB;Valberg,PA;Gehr,P
通讯作者：
Gehr,P