6.Microbial Growth CHAPTER 6 Microbial Growth Outline 6.1 The PH 123 e12 65 63 The Con 64Prescott−Harley−Klein: Microbiology, Fifth Edition II. Microbial Nutrition, Growth, and Control 6. Microbial Growth © The McGraw−Hill Companies, 2002 CHAPTER 6 Microbial Growth Membrane filters are used in counting microorganisms. This membrane has been used to obtain a total bacterial count using an indicator to color colonies for easy counting. 6.1 The Growth Curve 113 Lag Phase 113 Exponential Phase 114 Stationary Phase 114 Death Phase 115 The Mathematics of Growth 115 6.2 Measurement of Microbial Growth 117 Measurement of Cell Numbers 117 Measurement of Cell Mass 119 6.3 The Continuous Culture of Microorganisms 120 The Chemostat 120 The Turbidostat 121 6.4 The Influence of Environmental Factors on Growth 121 Solutes and Water Activity 121 pH 123 Temperature 125 Oxygen Concentration 127 Pressure 129 Radiation 130 6.5 Microbial Growth in Natural Environments 131 Growth Limitation by Environmental Factors 131 Counting Viable But Nonculturable Vegetative Procaryotes 132 Quorum Sensing and Microbial Populations 132 Outline