Submitted on: 28 April 2000.
Revised on: 20 June 2000.
Accepted on: 10 August 2000.
___________________BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
Submitted on: 08 January 2013.
Revised on: 06 May 2013.
Accepted on: 09 June 2013.
___________________BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
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