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Barua, Anurup Gohain
- Steady-State and Time-Resolved Bioluminescence of the Firefly Asymmetricata circumdata (Motschulsky)
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PDF Views:105
Authors
Angana Goswami
1,
Upamanyu Sharma
1,
Mana Mohan Rabha
1,
Subhash Chandra Rajbongshi
2,
Anurup Gohain Barua
1
Affiliations
1 Department of Physics, Gauhati University, Guwahati 781 014, IN
2 Department of Electronics and Communication Engineering, Institute of Science and Technology, Gauhati University, Guwahati 781 014, IN
1 Department of Physics, Gauhati University, Guwahati 781 014, IN
2 Department of Electronics and Communication Engineering, Institute of Science and Technology, Gauhati University, Guwahati 781 014, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1838-1842Abstract
After Luciola praeusta Kiesenwetter 1874, Asymmetricata circumdata (Motschulsky) is the second Indian species of firefly identified recently. Here we present steady-state and time-resolved measurements of bioluminescence emissions of male specimens of this new-found species. Steady-state spectra recorded in a high-resolution spectrometer show the peak wavelength at 570 nm, while the same on a colour film in a glass spectrograph show the peak at 579 nm between green and red bands, which prompts speculation that a sharp, laser-like line might exist in the emission spectrum of this species just as the one in L. praeusta. The diffraction pattern produced by a grating consolidates this proposition. Flashes recorded in an oscilloscope reveal the appearance of a small pulse in combination with the main one, which becomes prominent both at low and high temperatures.Keywords
Asymmetricata circumdata (Motsch.), Bimodal Flash, Emission Spectrum, Peak Wavelength.Full Text
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- Coherence of the Light of Firefly Luciola praeusta
Abstract Views :215 |
PDF Views:88
Authors
Affiliations
1 Department of Physics, Gauhati University, Guwahati 781 014, IN
1 Department of Physics, Gauhati University, Guwahati 781 014, IN
Source
Current Science, Vol 114, No 03 (2018), Pagination: 637-643Abstract
Firefly bioluminescence has given rise to several curiosity-driven as well as application-oriented studies. The emission spectrum of the Indian species of firefly Luciola praeusta Kiesenwetter 1874 (Coleoptera : Lampyridae : Luciolinae) has been shown to consist of two broad green- and red-coloured sectors, with a narrow yellow one in between. Here we present interference patterns of light of this firefly species using a Michelson interferometer for different positions of the two reflecting mirrors, up to a path difference of 11.5 cm. Next we employ Young’s double-slit method with the lantern of the firefly as the source at pinhole separations of 160, 170 and 180 m. From the fringes obtained in these two sets of experiments, we conclude that the light of the firefly exhibits excellent temporal as well as good spatial coherence properties.Keywords
Bioluminescence, Firefly, Interference Patterns, Temporal and Spatial Coherence.Full Text
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- Goswami, A., Sharma, U., Rabha, M. M., Rajbongshi, S. C. and Gohain Barua, A., Steady-state and time-resolved bioluminescence of the firefly Asymmetricata circumdata (Motschulsky). Curr. Sci., 2015, 109, 1838–1842.
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