Submitted on: 21 September 2006.
Revised on: 10 January 2007.
Accepted on: 20 January 2007.
___________________ANNALS OF MICROBIOLOGY---BMC
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Submitted on: 17 November 2004.
Revised on: 18 January 2005.
Accepted on: 09 February 2005.
___________________ANNALS OF MICROBIOLOGY---BMC
Submitted on: 21 October 2009.
Revised on: 06 February 2010.
Accepted on: 17 March 2010.
___________________ANNALS OF MICROBIOLOGY---BMC
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