The Isolation,Screening and Ultraviolet Mutation Breeding of Bacillus subtilis Strains Producing Extracellular Amylase
XIE Feng xing, ZHAo Yujie, ZHoU Ke, ZHANG Feng feng, LI Ya ling
ACTA AGRICULTURAE BOREALI-SINICA . 2009, (3): 78 -82 .  DOI: 10.7668/hbnxb.2009.03.017