Aquatic_Microbial_Biochemistry_

Aquatic_Microbial_Biochemistry_ - Chapter 6 AQUATIC...

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Unformatted text preview: Chapter 6 AQUATIC MICROBIAL BIOCHEMISTRY Environmental Chemistry Portier 6.1 AQUATIC BIOCHEMICAL PROCESSES Microorganisms are living catalysts for chemical processes in water and soil Bacteria Fungi Protozoa Algae Most major chemical processes in water are mediated by microorganisms Oxidation/reduction Reactions involving organic matter Algae are primary producers of organic matter (biomass) in water Microbial processes form many sediments and mineral deposits 2 3 Figure 6.1 Effects of microorganisms on water 4 Characteristics of microorganisms in water Pathogens, including viruses, must be eliminated from drinking water Microorganisms in water are prokaryotes (bacteria) and eukaryotes , (protozoa, fungi, algae) Algae and photosynthetic bacteria are producers Fungi and most bacteria are reducers 5 Figure 6.2 Classification of microorganisms 6.2 Algae Algae are generally microscopic organisms that subsist on inorganic nutrients using solar energy and producing biomass from carbon dioxide by photosynthesis Phycology is the study of algae Four major kinds of algae of which Chlorophyta (green algae) are responsible for most productivity in water 6 7 Main role of algae in water is production of biomass, {CH2O} using photochemical energy, h CO2 + H2O + h {CH2O} + O2 General nutrient requirements for algae Carbon from CO2 or HCO3- Nitrogen, generally from NO3- Phosphorus from H2PO4 or HPO42- Sulfur from SO42- Trace elements (iron may be limiting) Lichen are algae and fungi in a symbiotic relationship Involved in rock weathering 8 6.3 Fungi Nonphotosynthetic oxic eukaryotic organisms Wide range of morphology, often filamentous Generally do not grow well in water, but generate decomposition products that get into water Most important function in environment is breakdown of plant cellulose with cellulase enzyme Key role in producing humic substance from plant matter 9 6.4 Protozoa Protozoa are microscopic animals composed of single eukaryotic cells Wide variety of morphology and characteristics Motility Shells Spore formation...
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Aquatic_Microbial_Biochemistry_ - Chapter 6 AQUATIC...

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