《微生物学 Microbiology》课程PPT教学课件（英文版）environmental microbiology 2/3

Chapter 27,part B Environmental Microbiology

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings B.E Pruitt & Jane J. Stein Chapter 27, part B Environmental Microbiology

Decomposition by Microbes (a)Solid municipal wastes being turned by a specially (b)Compost made from municipal wastes awaiting trucks designed machine. to spread on agricultural fields. Figure 27.10

Decomposition by Microbes Figure 27.10

Biofilms Clumps of bacteria Migrating adhering to surface clump of bacteria Surface Water currents Figure 27.11

Biofilms Figure 27.11

Freshwater Zonation Algae, Solar energy cyano- bacteria Littoral zone Littoral zone Limnetic zone Pseudomonads, Caulobacter, Profundal zone Hyphomicrobium Cytophaga Benthic zone Purple and green Desulfovibrio. sulfur bacteria methane bacteria Clostridium Figure 27.12

Freshwater Zonation Figure 27.12

Bioluminescence Luciferase FMNH2 →FMN+photon Figure 27.13

Bioluminescence Figure 27.13 FMNH2 FMN + photon Luciferase

Water Quality Microbes are filtered from water that percolates into groundwater. Some pathogens are transmitted to human in drinking and recreational water. Resistant chemicals may be concentrated in the aquatic food chain. Mercury is metabolized by certain bacteria into a soluble compound,concentrated in animals

Water Quality • Microbes are filtered from water that percolates into groundwater. • Some pathogens are transmitted to human in drinking and recreational water. • Resistant chemicals may be concentrated in the aquatic food chain. • Mercury is metabolized by certain bacteria into a soluble compound, concentrated in animals

Waterborne Diseases Waterborne Disease Outbreaks Associated with Drinking Water Cause of Outbreak Percentage Parasitic(Cryptosporidium,Giardia) 35.3 Unidentified 29.4 Bacterial (Salmonella,Campylobacter, etc.) 23.5 Chemical (pesticides,nitrates,excess fluorides) 11.8 Waterborne Disease Outbreaks Associated with Recreational Water Cause of Outbreak Percentage Cryptosporidium 50.0 E.coli O157:H7 16.7 Unknown 16.7 Norwalk-like viruses 11.1 Shigella 5.6 Table 27.2

Waterborne Diseases Table 27.2