Submitted on: 20 August 2002.
Revised on: 26 November 2002.
Accepted on: 08 January 2003.
___________________Journal of Agriculture and Food Research
http://reply.papertrans.cn/2/152/15187/15187-32.png
http://reply.papertrans.cn/2/152/15187/15187-33.png
http://reply.papertrans.cn/2/152/15187/15187-34.png
Submitted on: 13 December 1999.
Revised on: 16 January 2000.
Accepted on: 23 February 2000.
___________________Journal of Agriculture and Food Research
http://reply.papertrans.cn/2/152/15187/15187-36.png