RT Journal Article
SR Electronic
T1 Influence of a mono-frequency sound on bacteria can be a function of the sound-level
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 071746
DO 10.1101/071746
A1 Vijay Kothari
A1 Chinmayi Joshi
A1 Pooja Patel
A1 Milan Mehta
A1 Shashikant Dubey
A1 Brijesh Mishra
A1 Niral Sarvaiya
YR 2016
UL http://biorxiv.org/content/early/2016/08/26/071746.abstract
AB Chromobacterium violaceum was subjected to sonic stimulation with 300 Hz sound, at five different levels of loudness in the range of 70 – 89.5 dB. Sonic stimulation was found to affect bacterial growth and quorum sensing regulated pigment (violacein) production significantly. Magnitude of this effect was found to be dependent on sound-level. The minimum critical difference required to cause any statistically significant change in bacterial response with respect to sound-level was found to be 13 dB. Growth of C. violaceum was affected more at lower sound intensity, whereas pigment production was affected more at higher sound intensity. Additional experiments with C. violaceum and Serratia marcescens indicated that even a silent speaker emitting no sound can alter bacterial growth and/or pigment production upto a minor extent. Size of the test tube in which bacteria are exposed to sonic stimulation, was not found to affect the results much.