Electrons are passed via electron transport chain make proton gradient to make

Electrons are passed via electron transport chain

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Electrons are passed via electron transport chain; make proton gradient to make ATP – aerobic respiration Lithottrophic because donor is inorganic Abundant in the environment Tend to be autotrophs – fix CO2 Takes place in the membrane – as all respiration does; so they tend to have larger membranes ° Nitrite Oxidation Similar Lithotrophic aerobic respiration Nitrite is the donor; O2 is the acceptor Electron transport chain, etc. Also inorganic – so lithotrophic
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° Examples of nitrifying bacteria Conversion of wastes (ammonia) to nitrate in fish tanks – thus improving water quality for the fish Production of nitrite and nitrate (aka nitric acid and nitrous acid) on the surface of stone buildings and monuments, causing degradation Growth on structures strong human waste (night soil) producing nitrates that were used for explosives ° Denitrification: anaerobic respiration Electron transport chain Donor – variety; may use hydrogen, glucose, etc. May funnel electrons thru NADH Example – picture Collectively, the nitrifying and denitrifying microbes can make nitrogen gas ° Final Goal of Wastewater treatment – reduce level of phosphorus Microbes can polymerize phosphate ions to polyphosphate, store polyphosphate inside cell Converts soluble molecule to insoluble polymer Called EBPR – enhanced biological phosphate removal o Imp component of waste water facilities ° Waste can be treated by aerobic treatment Can also be done anaerobically, however aerobic respiration is encouraged Activated sludge – need to aerate: OR trickling filter – a microbial biofilm o These processes provide O2 ° Waste can be treated by anaerobic treatment Fermentation and methanogenesis dominate over aerobic respiration
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If you don’t aerate the O2 will be used up Anaerobes produce a variety of products -- LECTURE 14 ° Waste can be treated by aerobic treatment – convert via respiration to CO2 Many waste water treatment facilities have different system – tend to be aerobic, anerobic or combination Activated sludge; need to aerate (add O2 to facilitate microbial growth) Trickling filter – a biofilm; bed of rocks in which microbes can grow – also need to provide adequate O2 space Aerobic respiration is encouraged ° OR ° Waste can be treated by anaerobic treatment Different things happen bc different microbes grow anaerobically vs aerobically Fermentation and methanogensis dominate over aerobic respiration Methanoges – play an imp role in anaerobic degredation; obligate anaerobic archea ° Methanogenesis Can be used to provide energy from converted waste Only Archaea Use a variety of organic or inorganic compounds as electron donor for respiration (usually hydrogen or other compound) Use CO2 as electron acceptor – reduce it to form methane Electrons are sent to a type of Electron Transport chain – ultimately go to reduce CO2
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