lec 11 - Carbon Acquisition and Energy Harvesting MIMG 101...

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MIMG 101 Spring Quarter, 2008 Introductory Microbiology Lecture # 11 Carbon Acquisition and Energy Harvesting (see pages in chapters 8 & 12)
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Today’s topics: • Strategies to harvest energy from light or chemicals • Microbial strategies to obtain cell carbon • If derived from organic compounds, how to degrade them • Energy content and cell yield • Where does a cell get carbon: (is it from organic or inorganic carbon?) • Where does a cell get energy: (is it from light or from chemicals?) First, consider two different questions Then, how are these resources used?
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Nutritional classes of microorganisms • Chemotroph chemo- = “chemical” troph = “feeding” • Phototroph photo- = “light” troph = • Autotroph auto- = “self” troph = • Heterotroph hetero- = “different” troph = Source of Energy for Life Source of Carbon for Life Uses CO 2 Uses organic carbon Uses chemicals Uses photons Applies to all life forms on Earth…. (recall from prior lecture material)
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chemo-autotroph chemo-heterotroph photo-autotroph photo-heterotroph Phototrophs Chemotrophs microbes can sometimes do more than one mode!
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Consider, Pond or lake water, what’s there? Photosynthetic microbes: But first consider how they are similar/different …it has many microbial types present because… ….there are many different nutrient types available for growth! Heterotrophic microbes: bacteria, archaea, Autotrophic microbes: bacteria, & archaea
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chemo-autotroph chemo-heterotroph photo-autotroph photo-heterotroph Regardless of cell type…. All cells generally use carbon and energy in the same ways! (we will deal carbon fixation in a later lecture) • Similar routes of nutrient uptake • Similar routes for biosynthesis of intermediates • Similar ways to make macromolecules • Similar ways to assemble cell structures • Similar cell maintenance reactions for cell repair and survival Differences are in…. • Ways to make ATP • Ways to generate proton motive force (pmf) • Ways to degrade organic carbon • Routes for CO 2 “fixation” (in autotrophs)
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Cell metabolism = catabolism + anabolism + maintenance rtns nutrients for biosynthesis chemicals for energy (or light) waste products cell uptake excretion breakdown (use energy) (harvest energy) (energy gain?) intermediates waste (harvest energy) cell materials processing cell maintenance (use energy)
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The three ways to make ATP • Substrate level phosphorylation (SLP) • Respiration linked phosphorylation (RLP) • Photosynthesis linked phosphorylation (PLP) (the universal high energy currency in all cell types)
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Substrate level phosphorylation (SLP) (the topic of Friday’s lecture)
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This note was uploaded on 07/29/2008 for the course MIMG 101 taught by Professor Bradley during the Spring '08 term at UCLA.

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lec 11 - Carbon Acquisition and Energy Harvesting MIMG 101...

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