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BIOM 360 Week 5 Lecture Notes

by: Bronwyn

BIOM 360 Week 5 Lecture Notes BIOM 360-001

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About this Document

Lecture notes from 9/26 that finish the last section for the Unit 1 test on 9/30.
General Microbiology
Seth Walk
Class Notes
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This 2 page Class Notes was uploaded by Bronwyn on Tuesday September 27, 2016. The Class Notes belongs to BIOM 360-001 at Montana State University taught by Seth Walk in Fall 2016. Since its upload, it has received 5 views. For similar materials see General Microbiology in Microbiology at Montana State University.


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Date Created: 09/27/16
9/26: ● Biogeochemical cycling ○ Microbes on earth for >3.5 billion years changing and linking atmosphere, hydrosphere, and geosphere through nutrient cycling ○ The sum of microbial and chem processes between geosphere, hydrosphere, and atmosphere ○ Redox rxns -​ ■ Tendency of compound to accept e​ and be reduced ■ **table 28.1** ■ C cycle ● Enters common organic matter pool and oxidized to CO​ 2 ● Start at C fixation -- ½ of earth’s C fixed by microbes ● Inorganic C reduced to CH​ by methanogens 4​ ○ Largest source of CH​4 ● Table 28.2 ● C sources exceed C sinks ● Degradation of organic matter ○ Need O​ 2 ○ Organic → inorganic = mineralization Inorganic → organic = assimilation Nutrients in biomass = immobilization ○ O​2 ■ Oxic -- fully oxidized ■ Anoxic -- full reduced ○ Lignin ■ Anaerobic → peat bogs, muck soils ■ N cycle ● Nitrogenase ● N2​→ NH​ 4​organic N ● Nitrification ○ NH​4​ NO​ → 2​​ 3​ ● Assimilatory ● Dissimilatory ● Anammox ○ Anaerobic oxidation of NH​4​ N​ 2 ■ P cycle ● Required for a lot ● Growth limiting nutrient ● Organic and inorganic forms ■ S cycle ● Dissimilatory 2-​ -​ ○ SO​4​ = terminal e​ acceptor ● Assimilatory ○ SO​4​-reduced to be used in biosynthesis ● Global Climate Change ○ Microbes maintain dynamic equilibrium ○ Reflects changes in wind patterns, precipitation, ocean temperature ○ Greenhouse gases ■ Gases trap heat and accumulate faster than cycles can recycle them ■ Fertilizer has altered N cycle balance w/ NH4​addition 9/28: class review with TAs 9/30: Test


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