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Environmental Microbiology (MLEM-201)

Environmental Microbiology (MLEM-201). What do Microbes do? How can we use this to our advantage?. Lecturer: Dr. Mohamed Salah El-Din. Intended Learning Outcomes (ILO’s): Student will be able: To achieve a basic understanding of aquatic microbiology and microbial processes

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Environmental Microbiology (MLEM-201)

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  1. Environmental Microbiology(MLEM-201) What do Microbes do? How can we use this to our advantage? Lecturer: Dr. Mohamed Salah El-Din

  2. Intended Learning Outcomes (ILO’s): • Student will be able: • To achieve a basic understanding of aquatic microbiology and microbial processes • To know the major microorganisms of importance in freshwater, seawater, and • groundwater • To understand the major microbial processes involved in those habitats • To understand the major environmental factors and influences in those habitats • To understand how to apply basic microbiological and ecological principles in • understanding the applied processes known as bioremediation of contaminated • soils and groundwater.

  3. Sulfur cycle • Plants and certain microbes can use SO42- to make amino acids • H2S is oxidized to form SO42-

  4. Sulfur Cycle Microbial decomposition Proteins and waste products Amino acids Microbial dissimilation Amino acids (–SH) H2S Thiobacillus H2S SO42– (for energy, by respiration) Microbial & plant assimilation SO42– Amino acids

  5. The Phosphorous Cycle

  6. The Phosphorus Cycle • Inorganic phosphorus is solubilized by microbial acids • Made available to plants and other microbes • Is soluble in water • Combines with calcium in calcium phosphate deposits of ancient seas.

  7. Life Without Sunshine • Primary producers in most ecosystems are photoautotrophs • Primary producers in deep ocean and endolithic communities are chemoautotrophic bacteria Provides energy for bacteria which may be used to fix CO2 H2S SO42– Calvin Cycle CO2 Sugars Provides carbon for cell growth

  8. Use of chemicals in soil and water • Many man made chemicals do not biodegrade because they are not made by living organisms • Why?

  9. Decomposition by Microbes Components of agent orange Figure 27.8

  10. Assignment: As a part of the semester activity, one student is selected every week to prepare a short seminar about his/her point of interest in one of the lecture topics. That to be discussed and evaluated during the next lecture.

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