According to the genetic loci of nisin-resistant (Nisr) linking to lactose-fermenting ability (Lac+) closely, four nisin-resistant Lactococcus lactis strains were directionally screened from 205 samples of fresh milk on a selective medium (M17) supplemented with nisin, lactose and bromocresol purple.

Screening, isolation and identification of nisin resistance determinant gene in strains of Lactococcus lactis;

Study on the technology of solt-out for separating Nisin from fermentation broth;

Study on use of Nisin in flat peach pulpy juice during pilot test;

Experiment Study of Nisin Producing on Whey by Streptococcus Lactis P-99;

Fermentation conditions of high yielding nisin strain;