A Research On The Isolation, Identification And Antibacterial Property Of Yeasts In The Koumiss

19 strains of Yeasts were isolated from the koumiss samples of Inner Mongolia. According to these strains'morphology and physiological characteristics,they belonged to 8 gunus:En -domyces,lodderomyces,Pichia,Torulaspora,Kloeckera,Saccha-romycodes,Brettanomyces and pachytichospora.1 strain could not be identified because of its special morphology and physiological characteristics.Antibacterial characteristics was evaluated with E.coli,Str.aureus,listeria and Tub.bacillus being the indicator strains. 5 strains could inhibit E.coli'growth.Among them,there were also 2 strains could show antibacterial characteristics on Tub.bacillus. Since only the supernatant of the fermentation liquid had the antibacterial characteristics,the rough samples of antibacterial substance of 5 strain could be extracted using the ethyl ether.Also the rough samples showed the Antibac-terial activities.