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