04 Microbial Growth.pptx - Microbial Nutrition • All life requires – Electron flow to drive all life processes • Drives ions into out of cells •

04 Microbial Growth.pptx - Microbial Nutrition • All life...

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Microbial Nutrition All life requires: Electron flow, to drive all life processes Drives ions into, out of cells Used to create ATP Energy, to move electrons Materials, to make cell parts Nutrients
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Microbial Nutrition Electron flow requires: Source of electrons Lithotrophs Inorganic molecules are electron donors Organotrophs Organic molecules are electron donors Ultimate electron acceptor Inorganic molecules Respiration Organic molecules Fermentation
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Microbial Nutrition Source of energy Phototrophs Light energy excites electrons Excited molecules are electron donors Chemotrophs Chemicals are electron donors Oxidation of chemical Oxidation = donation of electrons Electron acceptor is reduced
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Microbial Nutrition Nutrients Must be supplied from environment Macronutrients Major elements in cell macromolecules Ions necessary for protein function Micronutrients Trace elements necessary for enzyme function
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Microbial Nutrition Essential nutrients –Carbon (CO 2 , acetate, glucose, etc.) –Nitrogen (N 2 , NO 3 - , NH 4 + , amino acids, etc.) –Phosphorus (PO 4 3- ) –Sulfur (S, H 2 S, SO 4 2- ) Cationic electrolytes (Na+, K+, Mg 2+ , Ca 2+ ) Iron (Fe 2+ , Fe 3+ ) Trace elements (Mn, Mo, Zn, Cu, Co, etc,)
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Microbial Nutrition Different microbes require different additional requirements Amino acids –N from air (N 2 ) Inorganics (NO 2 - , NO 3 - ) Electron acceptors Aerobic (O 2 ) vs. anaerobic organisms (Fe 3 + , SO 4 2- , NO 2 - , NO 3 - ) Light, inorganic or organic energy source
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Nutrient Uptake Passive diffusion Some gases pass freely through membranes • O 2 , CO 2 Follows gradient of material Facilitated diffusion Transporters pass material into/out of cell Follows gradient of material
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  • Spring '14
  • LawrenceR.Aaronson

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