Submitted on: 23 May 2010.
Revised on: 18 July 2010.
Accepted on: 30 August 2010.
___________________JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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Submitted on: 21 January 2011.
Revised on: 12 March 2011.
Accepted on: 31 March 2011.
___________________JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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