BLG 151 - Chapter 4 - Microbial Culture, Growth and Development.docx

BLG 151 - Chapter 4 - Microbial Culture, Growth and Development.docx

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Chapter 4 Microbial Culture, Growth and Development 4.0 Microbial Nutrition Obtain nutrients via carbon source o Heterotrophs – use organic molecules as carbon sources which often also serve as energy source Photoorganoheterotrophs Chemolithoheterotrophs Chemoorganoheterotroph (most pathogens) o Autotrophs use carbon dioxide (inorganic molecules) as their sole or principal carbon source; must obtain energy from other sources Photolithoautotrophs (photoautotrophs) Chemolithoautotrophs (chemoautotrophs) Obtain nutrients via energy source o Phototrophs – use light as energy source o Chemotrophs – obtain energy from oxidation of chemical compounds Obtain nutrients via electron source o Lithotrophs – use reduced inorganic substances as their electron source o Organotrophs – obtain electrons from organic compounds 4.1 Nutrient Uptake Carbon cycle 1. Heterotrophs gain energy from degrading complex organic compounds (such as polysaccharides) to smaller compounds (such as glucose and pyruvate). The carbon from pyruvate moves through the tricarboxylic acid (TCA) cycle and is released as CO 2 . In the
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