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Submitted on: 27 January 2002.
Revised on: 14 March 2002.
Accepted on: 06 April 2002.
___________________CANADIAN JOURNAL OF MICROBIOLOGY
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Submitted on: 22 February 2002.
Revised on: 16 June 2002.
Accepted on: 05 August 2002.
___________________CANADIAN JOURNAL OF MICROBIOLOGY
Submitted on: 20 March 1999.
Revised on: 14 May 1999.
Accepted on: 28 June 1999.
___________________CANADIAN JOURNAL OF MICROBIOLOGY