菌落粗糙型大肠杆菌的分离与鉴定

[目的]从内蒙古某地区的大豆蛋白中分离到了一株菌落粗糙型大肠杆菌,对该菌进行鉴定。[方法]通过生理生化试验。[结果]与常见的典型大肠杆菌相比,该菌有其独特之处:在固体培养基中,菌落干燥、扁平、表面粗糙;在液体培养基中,上清液清亮并有颗粒状沉淀,摇动沉淀不能完全散开。除此之外,该菌的其它特性均符合典型大肠杆菌的特征。[结论]该菌为菌落变异(由光滑型转变为粗糙型)的大肠杆菌。

两种常用消炎药对大肠杆菌及金黄色葡萄球菌菌落生长的影响

基于高中生物学实验知识，通过利用氨苄西林（胶囊）和阿莫西林（胶囊）两种药物对大肠杆菌及金黄色葡萄球菌进行纸片琼脂扩散法检测抑菌圈大小来确定常用消炎药对大肠杆菌及金黄色葡萄球菌菌落生长的影响，可初步比较消炎药的抑菌效果。

Effect of Disinfection Time on Microbial Content and Quality of Cold Fresh Chicken

[Objective] The aim was to provide reference for the production technolo- gy of cold fresh chicken. [Method] Lactic acid was used as the disinfectant in cooling water, so as to study the effect of disinfection time on the microbial content and quality of cold fresh chicken. [Result] With disinfection of 20 min, the removal rates of the total colonies, coliforms and moulds reached over 95%. As the disinfec- tion time was further extended, it had no significant effect on the removal effects of the microbial content and could affect the tenderness and color of cold fresh chick- en. [Cendusion] The study provides references for the design and optimization of the production process of cold fresh chicken.

对人教版《生物·选修1·生物技术实践》部分难点的讨论

探讨了人教版高中生物选修1教材中的一些问题,包括MS固体培养基的母液保存方法,大肠杆菌在伊红美蓝培养基上形成的菌落的颜色,紫外线照射属于哪种控制微生物的方法,牛肉膏、蛋白胨的成分差异等。