[农学]微生物学课件.pdf

Bacterial colonies growing on a plate of nutrient agar Bacterial colonies growing on a plate of nutrient agar Microbial Growth and Microbial Growth and Its Control Its Control 第六章微生物的生长及其控制 第六章微生物的生长及其控制 Microbial Growth Microbial Growth 微生物的生长 微生物的生长 Microbial Growth - refers to the # Microbial Growth - refers to the # of cells, not the size of the cells of cells, not the size of the cells • Colony growth • Colony growth = individual growth + individual reproduction = individual growth + individual reproduction 群体生长= 个体生长+ 个体繁殖 群体生长= 个体生长+ 个体繁殖 • Microbial growth usually refers to colony • Microbial growth usually refers to colony growth growth 微生物生长通常指细胞数量的增加 微生物生长通常指细胞数量的增加 Content Content 1. Measurement of bacterial growth 1. Measurement of bacterial growth 2. Characteristics of microbial growth 2. Characteristics of microbial growth – Typical growth curve – Typical growth curve 3. Types of microbial culture 3. Types of microbial culture 4. Factors influencing the bacterial growth 4. Factors influencing the bacterial growth 5. The control of harmful microbial growth 5. The control of harmful microbial growth Measurement: Measurement: Growth Reproduction Growth Reproduction 微生物生长和繁殖的测定 微生物生长和繁殖的测定 Growth measurement Growth measurement 生长测定 生长测定 1. Direct method 直接法 1. Direct method 直接法 – Dry weight: ≈10~20% of wet weight – Dry weight: ≈10~20% of wet weight -13 – E. Coli : 2.8 ×10-13 g /cell – E. Coli : 2.8 ×10 g /cell 2. Indirect method 间接法 2. Indirect method 间接法