Effects of ultrasound on Drosophila—II. The heating mechanism
1980; Elsevier BV; Volume: 6; Issue: 3 Linguagem: Inglês
10.1016/0301-5629(80)90021-6
ISSN1879-291X
AutoresEdwin L. Carstensen, S.Z. Child,
Tópico(s)Physiological and biochemical adaptations
ResumoAn exposure of the eggs of Drosophila melanogaster to a traveling wave of 1 MHz ultrasound at 5 W/cm2 for 30 sec has been found to kill approximately 70% of the population. To determine whether heating could be responsible for this effect, the sensitivity of the eggs to heat alone was tested. Temperature increments attributable to ultrasound were estimated by treating the eggs as heat sources in a thermally conducting medium. The absorption coefficient of the eggs was found to be very large but estimated to be less than 5 nepers/cm. The corresponding maximum temperature increments were calculated to be less than 3°C. This value is far too low to account for the observed effects on the basis of heating.
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