第四节环境对微生物生长的 影响及微生物生长的测定
第四节 环境对微生物生长的 影响及微生物生长的测定
一、环境对微生物生长的影响 I温度 ⅡpH Ⅱ氧浓度
一、环境对微生物生长的影响 I 温度 II pH III 氧浓度
1温度 p嗜冷菌：Grows well at 0C;optimally between 0C -20°C p耐冷菌：Can grow at0-35C;optimum between 20-30°C ●嗜温菌：Optimum around20-45c ●嗜热菌：Optimum around55-65C 极端嗜热菌：Optimum around80-113C
I 温度 嗜冷菌: Grows well at 0ºC; optimally between 0ºC – 20ºC 耐冷菌: Can grow at 0 – 35ºC; optimum between 20 – 30ºC 嗜温菌: Optimum around 20 – 45ºC 嗜热菌: Optimum around 55 – 65 ºC 极端嗜热菌：Optimum around 80 – 113 ºC
Il pH 嗜酸菌 Grow optimally between pH 0 and 5.5 嗜中性菌 Growoptimally between pH 5.5 and 8 嗜碱菌 Grow optimally between pH 8-11.5
II pH 嗜酸菌 Grow optimally between pH 0 and 5.5 嗜中性菌 Growoptimally between pH 5.5 and 8 嗜碱菌 Grow optimally between pH 8 – 11.5
Ⅲ氧浓度 好氧的 微好氧菌 耐氧厌氧菌 图6-12氧与细菌生长的关系 严格好氧菌：Require oxygen for growth(~2O%) D兼性厌氧菌：Grow best in the presence of oxygen, but are able to grow(at reduced rates)in the absence of oxygen b名 微需氧菌：Require reduced concentrations of oxygen (~2-10%)for growth 耐氧厌氧菌：Can grow equally well in the presence or absence of oxygen 严格厌氧菌：Grow in the absence of oxygen;cannot grow in the presence of oxygen
III 氧浓度 严格好氧菌: Require oxygen for growth (~20%) 兼性厌氧菌: Grow best in the presence of oxygen, but are able to grow (at reduced rates) in the absence of oxygen 微需氧菌: Require reduced concentrations of oxygen (~2 – 10%) for growth 耐氧厌氧菌: Can grow equally well in the presence or absence of oxygen 严格厌氧菌: Grow in the absence of oxygen; cannot grow in the presence of oxygen