Download Bioeffect: Literature Reviews 1980–1987 by Professor Hans-Dieter Rott MD (auth.), Professor Hans-Dieter PDF

By Professor Hans-Dieter Rott MD (auth.), Professor Hans-Dieter Rott MD (eds.)

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W. L. Nyborg and D. L. Miller assess the various mechanisms whereby the energy of MHz acoustic waves could be converted into forces capable of modifying biological tissues. They conclude that at the low timeaveraged intensity levels commonly encountered in diagnostic exposures, most of the positive in vitro bioeffect observations reported to date are associated with the presence of small gas bubbles within the irradiated cells, tissues or suspensions ("Physical mechanisms for biological effects of ultrasound at low intensity levels").

Further investigations using improved measurement techniques would be of interest. In a concluding section on ultrasound bioeffects, the author reports on the different survival rates of haemolytic streptococci and staphylococci after "sonification" at different turbine rotation rates. In order to avoid adverse bioeffects, he recommends that the turbine rotation rate be kept below 100000 rpm, and that adequate amounts of spray be applied. Erlangen, May 1986. 29 Ultrasonic induction of sister chromatid exchange in human lymphocytes M.

Martin, B. M. l. 78 MHz ultrasound. Rotation of blood cells was observed inside the small blood vessels which lie alongside the branching cartilaginous rods supporting the tail. Peak acoustic intensities greater than about 1 W/ cm2 (i. e. spatially averaged intensities greater than about 120 mW/cm2) caused rotation of red blood cells within the 5-10 ~m diameter capillary branches which traversed the cartilaginous rods, whereas higher intensities were required to cause rotation inside the 15-30 ~m diameter vessels running parallel to the rods.

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