Ref ID : 384
Hill, R.J.; The temperature-dependent emission of low frequency sound by motile cultures of the ciliate Tetrahymena thermophilia. Biochem.Biophys.Res.Commun. 117:190-195, 1983
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When a sensitive condenser microphone is appropriately sealed and immersed into a motile suspension of Tetrahymena, a characteristic sound spectrum can be recorded. The spectrum of cells cultured at 25 degrees C and measured at 20 degrees C contains three main components, centred around 40, 55 and 80 Hz. Both the intensity and distribution of the sound emission are altered when the cells are cooled to 12 degrees C or warmed to 33 degrees C. No such sound emission is detectable from suspensions of sessile organisms.