Submitted on: 15 February 2006.
Revised on: 22 March 2006.
Accepted on: 08 May 2006.
___________________Journal of Chemistry and Technologies
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Submitted on: 16 April 2011.
Revised on: 30 June 2011.
Accepted on: 16 August 2011.
___________________Journal of Chemistry and Technologies
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Submitted on: 01 November 2003.
Revised on: 31 December 2003.
Accepted on: 10 February 2004.
___________________Journal of Chemistry and Technologies