5,10,15,and 20 year old Larix gmelini and Betula platyphylla were used aspulping raw material in the research.The examination of young L.gmelini and B.Platyphyl
WHAT IS BIOTECHNOLOGYIn the earlier time,biotechnologymainly meant microbiologic fermention.Since 1970‘s,as gene engineering,cytolog-ical engineering and enzym