冻融循环下大肠杆菌O157:H7在长春市南湖岸边水中的存活行为研究
发布时间：2018-08-13 12:18
【摘要】：北方地区的初春、晚秋,水体表层的夜冻昼融过程是典型特征。冻融循环过程影响水体自身理化性质,理化性质的变化对水中微生物,尤其是潜在的致病微生物的存活也会产生一定的影响。实验在室内模拟了大肠杆菌O157:H7在冻融循环条件下,在长春南湖水中的动态存活特征;并通过线性模型和Weibull模型,计算大肠杆菌O157:H7在污染水体后衰减达到最低检测限的时间(ttd);并运用多元线性回归进行相关性分析,找出影响实验菌种存活的关键因素。研究表明,南湖水的p H和氨氮与大肠杆菌O157:H7的存活相关。研究结果可为调查大肠杆菌O157:H7在湖水中的存活趋势,评估其可能带来的环境健康风险,为制定相应的环境管控措施提供科学依据。
[Abstract]:In the early spring and late autumn, the melting process of night-frozen day on the surface of the water body is a typical feature. The process of freeze-thaw cycle affects the physical and chemical properties of water body, and the change of physical and chemical properties will also have a certain effect on the survival of microorganisms in water, especially the potential pathogenic microorganisms. The dynamic survival characteristics of Escherichia coli O157:H7 in the water of Changchun Nanhu Lake under freeze-thaw cycle were simulated in laboratory, and the linear model and Weibull model were used. The time that Escherichia coli O157:H7 attenuated to the lowest detection limit after polluted water was calculated and the correlation analysis was carried out by using multivariate linear regression to find out the key factors affecting the survival of experimental bacteria. The results showed that pH and ammonia nitrogen were correlated with the survival of Escherichia coli O157:H7 in Nanhu Lake. The results can provide scientific basis for investigating the survival trend of Escherichia coli O157:H7 in lake water, evaluating its possible environmental health risks and making corresponding environmental control measures.
【作者单位】： 吉林大学环境与资源学院;
【基金】：国家自然科学基金(41571304)资助
【分类号】：R378.21
，
本文编号：2180967
[Abstract]:In the early spring and late autumn, the melting process of night-frozen day on the surface of the water body is a typical feature. The process of freeze-thaw cycle affects the physical and chemical properties of water body, and the change of physical and chemical properties will also have a certain effect on the survival of microorganisms in water, especially the potential pathogenic microorganisms. The dynamic survival characteristics of Escherichia coli O157:H7 in the water of Changchun Nanhu Lake under freeze-thaw cycle were simulated in laboratory, and the linear model and Weibull model were used. The time that Escherichia coli O157:H7 attenuated to the lowest detection limit after polluted water was calculated and the correlation analysis was carried out by using multivariate linear regression to find out the key factors affecting the survival of experimental bacteria. The results showed that pH and ammonia nitrogen were correlated with the survival of Escherichia coli O157:H7 in Nanhu Lake. The results can provide scientific basis for investigating the survival trend of Escherichia coli O157:H7 in lake water, evaluating its possible environmental health risks and making corresponding environmental control measures.
【作者单位】： 吉林大学环境与资源学院;
【基金】：国家自然科学基金(41571304)资助
【分类号】：R378.21
，
本文编号：2180967
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