06_lecture - Chapter 6 Microbial Nutrition 1 Elements of...

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Chapter 6 Microbial Nutrition 1
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macroelements (macronutrients) C, O, H, N, S, P  found in organic molecules such as proteins, lipids,  carbohydrates, and nucleic acids  K, Ca, Mg, and Fe cations and serve in variety of roles including enzymes,  biosynthesis required in relatively large amounts 2 Elements of Life - 1
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micronutrients (trace elements) Mn, Zn, Co, Mo, Ni, and Cu required in trace amounts often supplied in water or in media  components ubiquitous in nature serve as enzymes and cofactors some unique substances may be  required 3 Elements of Life - 2
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carbon is backbone of all organic components  present in cell hydrogen and oxygen are also found in organic  molecules electrons play a role in energy production and  reduction of CO2 to form organic molecules 4 Carbon, Hydrogen, Oxygen,  and Electrons
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often satisfied together carbon source often provides H, O, and electrons heterotrophs use organic molecules as carbon sources which  often also serve as energy source can use a variety of carbon sources autotrophs use carbon dioxide as their sole or principal carbon  source must obtain energy from other sources  5 Requirements for Carbon,  Hydrogen, and Oxygen
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6 Table 6.2
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based on energy source phototrophs use light chemotrophs obtain energy from oxidation of  chemical compounds based on electron source lithotrophs use reduced inorganic substances organotrophs obtain electrons from organic  compounds 7 Nutritional Types of Organisms
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majority of microorganisms known photolithoautotrophs (photoautotrophs) chemoorganoheterotrophs  (chemoheterotrophs)  majority of pathogens ecological importance photoorganoheterotrophs chemolithoautotrophs chemolithotrophs 8 Classes of Major Nutritional  Types 
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9 Table 6.3
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some have great metabolic flexibility based on  environmental requirements provides distinct advantage if environmental  conditions change frequently 10 Microorganisms May Change  Nutritional Type
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needed for synthesis of important  molecules (e.g., amino acids, nucleic  acids) nitrogen supplied in numerous ways phosphorus usually supplied as 
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06_lecture - Chapter 6 Microbial Nutrition 1 Elements of...

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