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Suggestions for Microbe of Interest Presentation

Suggestions for Microbe of Interest Presentation Remember: Topic and one reference needed by next Weds. Where to find topics: Chapters: 19-23, 28, & 29 of your textbook Copies of Science and Microbe in the lab (hard copies of Science are also available in the library)

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Suggestions for Microbe of Interest Presentation

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  1. Suggestions for Microbe of Interest Presentation Remember: Topic and one reference needed by next Weds. Where to find topics: Chapters: 19-23, 28, & 29 of your textbook Copies of Science and Microbe in the lab (hard copies of Science are also available in the library) Online review sources like Trends in Microbiology (can be accessed through Science Premiere off the library’s online site) References Must be Peer-Reviewed (ie. journal articles)!!! Be Bold!!! Don’t do a disease!

  2. A (Really Brief) History of the Earth G ybp Big Bang --- produces H & He 12.8 Stellar SynthesisStill Happening Gravitational collapse and fusion create higher elements in stars, supernovae disperse elements. Formation of our Solar system4.8 Some solid surface on Earth4.2 First Prokaryotes3.5-3.8 Oxygenation of Earth’s Atmosphere, 2.6 Cyanobacteria begin making O2 Lots of other multicellular evolution0.5

  3. Tree of Life --- How to make the best use of powerpoint lectures

  4. Take Home Message: We are all star stuff! Life Happens: wherever there is liquid water and an energy source Prokaryotes have been around for about about 3.5 G yrs.! ( in many ways they are way ahead of us in cellular efficiency and in integrating with their environment) Other key terms & Concepts Isotopic fractionation Stromatolites A bacterial community which can precipitate minerals from water and thus leaves a “fossil” imprint Allan Hills Meteorite Astrobiology

  5. Prokaryote to Eukaryote  Endosymbiont Theory Bacterial Nutrition Types: Photoautotroph *Photoheterotroph *Chemoautotroph Chemoheterotroph

  6. Prokaryotes: Stayed small enough to rely on passive diffusion Strictly haploid (but do have plasmids) Most metabolism occurs at the cell membrane Evolved to maximize use of space/resources (they can grow fast) Generally have multifunctional proteins (the “do more with less” approach to life) Eukaryotes: Traded fast growth and small cell volume for complexity and cellular cooperation. Grow slower Require more gene regulation (larger genome required) Unable to compete for low energy niches (Chemoheterotrophs and Photoautotrophs only)

  7. Prokaryotes: Had the Earth to themselves for about 3.0 G years Inhabit just about every conceivable niche using an astounding array of metabolic pathways Are essential in all ecosystems By all measures other than intelligence, they are the dominant form of life on Earth

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