摘要:随着自然界沙门氏菌耐药性的不断提高,开发新型的抗生素替代品成为当务之急。本研究从生猪养殖基地的粪便、污水样品中分离到85株能裂解沙门氏菌的噬菌体,并筛选到一株裂解性强、噬菌谱广的噬菌体SQC73。随后测定了其酸碱耐受性,热稳定性,最佳感染复数,一步生长曲线,结果表明其最适pH值为7~8,热稳定性良好,最佳感染复数为100:1,潜伏期为20min,暴发期为70min,平均裂解量为25.3;灭菌效果试验显示SQC73可以有效消灭平板上99%以上的沙门氏菌,模拟环境污染试验表明可以有效杀灭96%以上的沙门氏菌,具有作为环境灭菌剂的潜力。28049 毕业论文关键词:沙门氏菌;噬菌体;分离;生物学特性
Isolation and biological characteristics of Salmonella phages from swain
Abstract:With the increasing resistance of the Salmonella, it is imperative to develop new substitutes of antibiotic. Eighty-five Salmonella bacteriophages were isolated from the faeces and sewage samples of pig farms. There host range were detected and a phage named SQC73 showed a wide host range and good lysis ability. The biological characteristic were identified thepHand thermostability, optimal multiplicity of infection (MOI) and one-step growth experiment. It showed excellent tolerance topHand temperature. The best MOI is 100:1, the latent period was 20 min, the burst period was 70 min and the average burst size was 25.3 phages per cell. In sterilization effect test, SQC73 killed more than 99% of the salmonella on agar plate. In simulated pollution test, SQC73 killed more than 96% of the Salmonella which showed excellent potential as environmental disinfectants.
Key words: Salmonella; phage; isolation; biological characteristic
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