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Submitted on: 27 July 2014.
Revised on: 15 October 2014.
Accepted on: 03 November 2014.
___________________ANNALS OF MICROBIOLOGY---BMC
Submitted on: 19 February 2002.
Revised on: 27 April 2002.
Accepted on: 08 May 2002.
___________________ANNALS OF MICROBIOLOGY---BMC
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Submitted on: 17 September 2003.
Revised on: 21 November 2003.
Accepted on: 10 December 2003.
___________________ANNALS OF MICROBIOLOGY---BMC