Martin C J, Pratt B M, Watmough D J
Br J Cancer Suppl. 1982 Mar;5:161-4.
Tails of the tropical fish Xiphophorous maculatus have been studied by light microscopy during irradiation with continuous wave 780 kHz ultrasound. Acoustically-induced microstreaming was observed in blood vessels during irradiation with peak intensities above 1 Wcm-2. The microstreaming took the form of rotation of single blood cells and clusters of a few cells and occurred at positions close to the edges of cartilage rods supporting the tail. Streaming was detected initially in vessels 5-10 micrometers across where it impeded blood flow, and as the blood velocity fell it was also observed in larger vessels 15-30 micrometers across. Measurements of rotation speed showed that streaming velocity increased with intensity. The microstreaming is thought to result from radiation torque created by the complex standing wave field produced by reflection from the irradiation tank window and the cartilage rods, or by vibration of the rods in the sound field.
在连续波780kHz超声照射下，利用光学显微镜对热带鱼剑尾鱼的尾巴进行了研究。当峰值强度高于1W/cm²照射时，在血管中观察到了声致微流。微流表现为单个血细胞和几个细胞簇的旋转，发生在支撑尾巴的软骨棒边缘附近的位置。最初在直径5 - 10微米的血管中检测到微流，此时它阻碍了血液流动，随着血流速度下降，在直径15 - 30微米的较大血管中也观察到了微流。转速测量表明，微流速度随强度增加。微流被认为是由照射槽窗口和软骨棒反射产生的复杂驻波场产生的辐射扭矩，或者是由声场中软骨棒的振动引起的。
