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Systems Microbiolo41 - kJmolK GGRTGKGHatm −−−...

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Systems Microbiology o For the chemical reaction AB →, o Negative ΔG: reaction releases energy, and is exergonic o Positive ΔG: reaction absorbs energy, and is endergonic o For the reaction , 􀂃 ΔG o is a constant called the Gibbs Standard Free Energy: you can look it up (1M, 25°C, pH 7, 1atm) o oo GnF ε′′Δ=−Δ 􀂃 : number of electrons involved in reaction n 􀂃 : Faraday constant F 􀂃 o ε′: Standard reduction potential at 1M, 25°C, pH 7, and 1atm o With these equations, you can calculate which reactions will release energy, and from this you can predict which kinds of microbes will exist o ooo (electron acceptor)(electron donor)εεε′′′Δ=− o ooo 0.21(0.414)0.204 V εεε′′′Δ=−=−−−=+ Therefore ΔG is positive, energy releasing o 8(93.67)0.204152.9 kJoomol GnFVk ε′′Δ=−Δ=−=− o However, a 1 atm concentration of hydrogen is unrealistically high. Therefore: 13o64162 [products]ln[reactants][1]152.9(8.31410(298))ln(10)[1]15.9(10)
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Unformatted text preview: kJmolK GGRTGKGHatm −−− ′Δ=Δ+Δ=−+×Δ=−= ° Aerobic respiration: O 2 is the terminal electron acceptor o Diagrams of energy production ° Modes of nutrition o Where does the carbon come from? (heterotrophs vs. autotrophs) o Where does the energy come from? o What molecule is the electron donor? o What molecule is the electron acceptor? (aerobic vs. anaerobic respiration) + + °° ° °°° aA bBcCdD 2 4 2 44 H S OSHO = = + + °° ° °° ° ° CO 2 + H 2 O O 2 +CH 2 O Autotrophs Heterotrophs ° ° Bacterial photosynthesis o Anoxygenic bacterial photosynthesis came first ° Uses bacteriochlorophyll, not chlorophyll ° Does not produce oxygen ° Does not split water o Photoautotrophs (use CO 2 ) vs. photoheterotrophs (use organic compounds) o The Z scheme/oxygenic photosynthesis (noncyclic photosynthesis because electrons are not “recycled”) vs. cyclic photosynthesis o The Calvin cycle...
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