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Submitted on: 04 April 2009.
Revised on: 23 July 2009.
Accepted on: 15 August 2009.
___________________JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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Submitted on: 31 January 2011.
Revised on: 17 March 2011.
Accepted on: 06 May 2011.
___________________JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY