topic_3_for_students - 2.8 Microbial Diversity...

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2.8 Microbial Diversity
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Physiological Diversity Phylogenetic diversity result of 4 billion years of evolution Metabolic diversity if there is a niche to exploit, microbe have adapted to exploit it limited only by constraints of chemistry and physics
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Energy source (for oxidation, providing electrons for ETC) 1.Light (photosynthetic) 1.Chemical (organic or inorganic) organo litho (e.g. H 2 , NH 3 , S 0 , NO 2 - ) (e.g. Glucose, acetate) Fundamentals of Nutrition
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Carbon source (for cell maintenance and division) 1.Fixed organic (C-C bonds) heterotroph Greek heterone = (an)other and trophe = nutrition 2. Gaseous inorganic (CO 2 ) autotroph Greek autos = self and trophe = nutrition Fundamentals of Nutrition
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[Energy source] [Carbon source] [‘troph’] Photo Chemoorgano Chemolitho hetero auto troph Which combination does not exist in nature? What are we? Which is Escherichia coli ? Which are Cyanobacteria ? Fundamentals of Nutrition + +
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Energy sources Chemoorganotrophs energy from oxidation of organic compounds Chemolithotrophs energy from oxidation of inorganic compounds found only in prokaryotes Phototrophs energy from light captured by pigments may be oxygenic or anoxygenic
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Carbon is a major requirement for all organisms energy storage/manipulation structural Autotrophs “primary producers”
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topic_3_for_students - 2.8 Microbial Diversity...

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