Oxygen as an Electron Acceptor• Many microorganisms use oxygen as a terminal
electron acceptor in a process called aerobic respiration.
Figure 5.18
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
• 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
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