Submitted on: 22 February 2000.
Revised on: 01 June 2000.
Accepted on: 21 June 2000.
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Submitted on: 20 August 2001.
Revised on: 03 December 2001.
Accepted on: 08 January 2002.
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Submitted on: 05 January 2012.
Revised on: 29 March 2012.
Accepted on: 27 April 2012.
___________________JOURNAL OF MEMBRANE SCIENCE---ELSEVIER
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