Lecture 24 - Chemical cycles - Chapter 20 Elemental Cycling...

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Chapter 20: Elemental Cycling
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Stuff HW 5 – due Wed. If you want to turn it in early, bring it to office hours or slide it under my office door (3033C SLB) I will assign one final HW But it will be due Friday Dec 2 nd (the last day of class) Will probably go up this Friday. But maybe Saturday or Sunday There is a lecture and quiz Wednesday (Ch.21) Next week is lots of buffer Probably will cover some disease-causing microbes/viruses Final: Dec 5 th 8:00 AM -10:00 AM (2 hours) ~half will be just on new material Remainder will be open to the entire class Mostly Multiple choice, some free-response (short answer, fill in the blank, math?) If you have any grading issues on old material, you must bring them to me by the end of next Monday
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Biogeochemical cycles • Microbes catalyze many important conversions on Earth Several activities are prokaryotic- only • Most elemental conversion processes boil down to redox reactions • Potential use of microbes in recycling man-made materials Plastics, hazardous chemicals Prokaryotic-only activities
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Carbon cycling • Carbon is ~50% of a cell’s weight • Carbon in multiple forms • CO 2 • Methane • Organic • Inorganic • Autotrophs fixing CO 2 • Cycling of organic C • Respiration, fermentations
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Oxygen • Oxygen gas originally generated by microbes • Microbial O 2 synthesis in oceans accounts for half or more of O2 production on earth • Cyanobacteria, Diatoms
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Methane • Carbon and Oxygen cycling are closely linked Methane links these to sulfur cycling as well • Communities of Archaea and
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