BIOL 22100 Lecture Notes - Lecture 13: Biochemical Oxygen Demand, Lactic Acid, Deinococcus
26 Aug 2016
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Methanogens ( all archaea) electron donor h2 (methanol acetate) Sulfate reducers- electron donor often organic sometimes can be facultative lithotrophs (take electron from h2) Acceptor of so4 and can form h2s (swamp odor) Fermenters (use of organic electron acceptor without making a pmf) Propionibacterium: swiss cheese, acne (ferments lipids to produce acid(propionic acid and co2)) Some clostridial fermentation pathways produce atp (makes ethanol, butanol, acetone) Have to use reverse electron transport chain tomake reducing power. Energy goes uphill so it has to use light for energy. Sulfur oxidizers: uses s,h2s, as electron donor and o2 as electron acceptor. Nitrifying bacteria: nh4+ electron donor, o2 acceptor and produces no3- Pseudomonas- in an evolutionary competition between fitness and diversity, diversity wins (better to be adaptable than to fit in) Deinococcus radiodurans can live inside a nuclear reactor. Dna repair enzymes shielded by mn2+ phosphate peptide complex. Dna scaffolded so that repair can occur efficiently (holds them in place when it breaks down)
