Acknowledgements
K. Das was the recipient of Senior Research Fellowship
from ONGC-Centre for Petroleum Biotechnology, Tezpur
University. This study was supported by Wnancial grant
from ONGC-Centre for Petroleum Biotechnology. Authors
thank Prof. P.C. Deka, Chairman of ONGC Centre for
Petroleum Biotechnology, and Vice-Chancellor, Tezpur
University for his kind support to pursue this work.