Chapter 7 The Control of Microbial Growth

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• How is it possible that a solution containing a million bacteria would take longer to sterilize than one containing a half-million bacteria? 7-2 Copyright © 2010 Pearson Education, Inc.
Effectiveness of Antimicrobial Treatment Depends on • Time it takes to kill a microbial population is proportional to number of microbes. • Microbial species and life cycle phases (e.g.: endospores) have different susceptibilities to physical and chemical controls. • Organic matter may interfere with heat treatments and chemical control agents. • Exposure time: Longer exposure to lower heat produces same effect as shorter time at higher heat. Copyright © 2010 Pearson Education, Inc.
Page 1 and 2: Chapter 7 The Control of Microbial
Page 3 and 4: Terminology • Sepsis: microbial c
Page 5: Rate of Microbial Death Bacterial p
Page 9 and 10: Physical Methods of Microbial Contr
Page 11 and 12: Pasteurization • Significant numb
Page 13 and 14: Filtration • Air filtration using
Page 15 and 16: Ionizing Radiation • X-rays, -ray
Page 17 and 18: Nonionizing Radiation: Microwave
Page 19 and 20: Disk-diffusion Method Disk of filte
Page 21 and 22: Halogens Chlorine • Oxidizing age
Page 23 and 24: Heavy Metals Oligodynamic action: t
Page 25 and 26: Chemical Food Preservatives Sulfur
Page 27 and 28: Plasma • Luminous gas with free r
Page 29: Microbial Characteristics and Micro

Chapter 7 The Control of Microbial Growth

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