• MANA MOHAN RABHA

      Articles written in Journal of Biosciences

    • Bioluminescence emissions from the Indian winter species of firefly Diaphanes sp.

      MANA MOHAN RABHA UPAMANYU SHARMA ANURUP GOHAIN BARUA

      More Details Abstract Fulltext PDF

      Numerous studies have been carried out on different aspects of the light from summer-active fireflies. Characteristicsof this light have led to very interesting conclusions on the chemiluminescence reaction as well as onthe nature of the light from live fireflies. Here we present a first report on bioluminescence emissions from anewly found winter-active Indian species of firefly Diaphanes sp. The steady-state emission spectrum from thisspecies comes out to be apparently similar to those from the other two Indian summer species, Luciolapraeusta and Asymmetricata circumdata: asymmetric in nature with a little bit of change in the position of thepeak wavelength and in the width of the full width at half maximum. An increase in temperature toapproximately 28 deg C causes a red-shift in the peak wavelength, which probably indicates denaturation of theenzyme luciferase in the live, flashing condition. Emissions in the time domain reveal that the light is nevercompletely off – it decreases in intensity to a low value, sometimes very close to zero, and then increases – acharacteristic unheard-of till date. Flash durations are considerably longer than those from the two Indiansummer species; those become shorter at about 28 deg C and increase to noticeably larger values at highertemperatures.

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