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Submitted on: 16 March 2001.
Revised on: 30 April 2001.
Accepted on: 19 June 2001.
___________________JOURNAL OF APPLIED PHYCOLOGY---SPRINGER
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Submitted on: 31 March 2007.
Revised on: 23 July 2007.
Accepted on: 09 August 2007.
___________________JOURNAL OF APPLIED PHYCOLOGY---SPRINGER