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    • Keywords


      Diaphanes sp.; emission peak red shift; continuous flash train; reaction speed

    • Abstract


      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.

    • Author Affiliations



      1. Department of Physics, Pandit Deendayal Upadhyaya Adarsha Mahavidyalaya, Behali 784 184, India
      2. Department of Physics, Gauhati University, Guwahati 781 014, India
    • Dates

    • Supplementary Material

  • Journal of Biosciences | News

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