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Growth and the envrionment. Figure 5.2. Figure 5-3 Psychrophilic environment and psychrophiles. Figure 5-4 Thermophilic environments and thermophiles. Figure 5.5. Figure 5.6. Figure 5-8 Halophilic salt flats and halophilic bacteria . Changes in pH. Figure 5.11. - PowerPoint PPT Presentation
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Growth and the envrionment
Figure 5.2
Figure 5-3 Psychrophilic environment and psychrophiles.
Figure 5-4 Thermophilic environments and thermophiles.
Figure 5.5
Figure 5.6
Figure 5-8 Halophilic salt flats and halophilic bacteria.
Changes in pH
Figure 5.11
Figure 5-15 A soda lake ecosystem.
Figure 5-16 Na+ circulation in alkaliphiles.
Figure 5.17
Oxygen as an Electron Acceptor• Many microorganisms use oxygen as a terminal
electron acceptor in a process called aerobic respiration.
Figure 5.18
Figure 5.19
Oxygen-related growth zones in a standing test tube
• Generation and destruction of reactive oxygen species (ROS)
Figure 5.20
Humans Influence Microbial Ecosystems
• Maximum diversity in an ecosystem is maintained, in part, by the different nutrient-gathering profiles of competing microbes.
Figure 5.23
• Microbes die at a logarithmic rate.
• Decimal reduction time (D value) is the length of time it takes an agent or a condition to kill 90% of the population.
Figure 5.25
• The phenol coefficient test compares the effectiveness of disinfectants.
The Phenol Coefficient
Table 5.3
Figure 5.30
• Antibiotics are chemical compounds synthesized by one microbe that kill or inhibit the growth of other microbial species.
• Penicillin mimics part of the bacterial cell wall.• - Prevents cell wall formation and is bactericidal
Antibiotics
Figure 5.31
Figure 5.32
Effect of ampicillin (a penicillin derivative) on E. coli