Submitted on: 02 April 2001.
Revised on: 14 July 2001.
Accepted on: 11 September 2001.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
Submitted on: 19 April 2024.
Revised on: 17 June 2024.
Accepted on: 07 July 2024.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
Submitted on: 08 September 2010.
Revised on: 17 November 2010.
Accepted on: 13 December 2010.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
http://reply.papertrans.cn/1/52/5188/5188-14.png
Submitted on: 12 August 1999.
Revised on: 18 September 1999.
Accepted on: 30 September 1999.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
Submitted on: 03 December 2012.
Revised on: 23 March 2013.
Accepted on: 05 April 2013.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
Submitted on: 08 July 1998.
Revised on: 09 August 1998.
Accepted on: 21 September 1998.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
http://reply.papertrans.cn/1/52/5188/5188-18.png
Submitted on: 06 December 2020.
Revised on: 19 February 2021.
Accepted on: 31 March 2021.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE
Submitted on: 08 October 1999.
Revised on: 25 November 1999.
Accepted on: 17 December 1999.
___________________Chiang Mai Journal of Science---CHIANG MAI UNIV, FAC SCIENCE