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Bistability In Fluorescence From A Purple Non-Sulfur Bacteria

Anirban Bose, Sufi O. Raja, Sanhita Ray, Anjan Kr. Dasgupta
doi: https://doi.org/10.1101/132498
Anirban Bose
Calcutta University;
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Sufi O. Raja
Institute for Stem Cell Biology and Regenerative Medicine (inStem);
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Sanhita Ray
University of Calcutta
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Anjan Kr. Dasgupta
University of Calcutta
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  • For correspondence: adgcal@gmail.com
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Abstract

Bistable optical emission has been observed for photosynthetic purple non-sulfur bacteria \textit{Rhodobacter capsulatus} SB1003. The microbes respond to UV excitation (at 395nm) in a bifurcating way one branch corresponding to increase and the other corresponding to diminishing fluorescent emission in the range 590-685nm.This switching between this bifurcating branches can be observed when parameters like concentration , temperature are varied or static magnetic field is applied. Thus switching from amplification to reduction occurs if fluorophore concentration lowered. Again if temperature is lowered a steady quenching (instead of amplification) of fluorescence is observed. However presence of magnetic field of the order of 0.5 T reverts this and once again the systems resumes its fluoresence amplifying state. We propose that aggregation of bacterial porphyrin and regulation of such aggregation by photon excitation may explain this bistablity. Possible ecological implication of the photosynthetic bistability is suggested.

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Posted June 05, 2017.
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Bistability In Fluorescence From A Purple Non-Sulfur Bacteria
Anirban Bose, Sufi O. Raja, Sanhita Ray, Anjan Kr. Dasgupta
bioRxiv 132498; doi: https://doi.org/10.1101/132498
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Bistability In Fluorescence From A Purple Non-Sulfur Bacteria
Anirban Bose, Sufi O. Raja, Sanhita Ray, Anjan Kr. Dasgupta
bioRxiv 132498; doi: https://doi.org/10.1101/132498

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