1 Centre for Cellular and Molecular Biology, (CSIR), Hyderabad 500 007, India.
2 Molecular Microbiology Laboratory, Department of Biotechnology, University of North Bengal, Siliguri, West Bengal 734 430, India.
3 Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Alte Fischerhuette 2, 16775 Stechlin, Germany ; Institute of Biochemistry and Biology, Potsdam University, Am Neuen Palais 10, 14469 Potsdam, Germany.