翻译摘要（中 到 英）

Is rich in natural microbial strains resources, the paper aims to enrich the bacteria from these resources using natural breeding methods produce penicillin screening of new strains of Penicillium.Penicillin was first discovered and the most important category of antibiotics, in our day-to-day life of the production is widely used mainly by the current penicillin fermentation was Penicillium chrysogenum. The test of a total separation of the 17 species of Penicillium, and for Mingan Jun Staphylococcus aureus have identified seven strains of penicillin production;Then after a double fermentation, the fermentation of law-screen after the paper received two more production of Penicillium strain, and then get the potency of the largest production strains # 13, penicillin effect at 4.2 U / ml. The test further strains in the fermentation conditions were studied, 13 # strain the best fermentation pH value is pH = 6 Key words: Penicillium; penicillin; natural selection; screening; inhibiti