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chapt01_lecture - M icr obiology A Syst ems A ppr oach 2nd...

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Microbiology: A Systems Approach, 2 nd ed. Chapter 1: The Main Themes of Microbiology
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What are microbes? Where do you find microbes? Give some examples of microbes?
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1.1 The Scope of Microbiology Microbiology : The study of living things too small to be seen without magnification Microorganisms or microbes - these microscopic organisms Commonly called “germs, viruses, agents…” but not all cause disease and many more are useful or essential for human life
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Major Groups of Microorganisms Bacteria , algae , protozoa , helminthes , and fungi Viruses - noncellular, parasitic, protein- coated genetic elements that can infect all living things, including other microorganisms
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Branches of Microbiology Agricultural microbiology Biotechnology Food, dairy, and aquatic microbiology Genetic engineering and recombinant DNA technology Public health microbiology and epidemiology Immunology Many, many more
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Emerging Areas of Microbiology Geomicrobiology Marine microbiology Astromicrobiology
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1.2 The Impact of Microbes on Earth: Small Organisms with a Giant Effect Possibly the first inhabitants of earth Bacterial-like organisms in the fossil record as far back as 3.5 billion years ago ( prokaryotes - organisms without a true nucleus) 2 billion years later, eukaryotes (organisms with a true nucleus) emerged
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Figure 1.1
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Eukaryotes are precursors of multicellular organisms Unlike most organisms microbes have survived several catastrophic changes in history.
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Ubiquity of Microorganisms Found nearly everywhere Occur in large numbers Live in places many other organisms cannot Figure 1.2
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Microbial Involvement in Energy and Nutrient Flow Bacteria conducted photosynthesis before plants appeared (>50% of total oxygen production) Anoxygenic photosynthesis Oxygenic photosynthesis Aerobic respiration Ozone formation Biological decomposition and nutrient recycling
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