0006-3207/$ - see front matter 2008 Elsevier Ltd. All rights reserved.
doi:10.1016/j.biocon.2008.06.015
* Corresponding author: Tel.: +1 612 626 1213.
E-mail addresses: knr_hkk@hotmail.com (S. Simcharoen), barl0048@umn.edu (A.C.D. Barlow), knr_hkk@hotmail.com (A. Simcharoen).