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Submitted on: 01 September 2006.
Revised on: 27 September 2006.
Accepted on: 16 October 2006.
RESEARCH IN MICROBIOLOGY---ELSEVIER
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Submitted on: 13 May 1999.
Revised on: 28 May 1999.
Accepted on: 14 June 1999.
RESEARCH IN MICROBIOLOGY
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