SMCCCD BIOL 240 - Chapter 27 Environmental Microbiology (41 pages)

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Chapter 27 Environmental Microbiology



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Chapter 27 Environmental Microbiology

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Pages:
41
School:
San Mateo County Community College District
Course:
Biol 240 - General Microbiology

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Ch 27 Environmental Microbiology What do Microbes do How can we use this to our advantage Microbes have small genomes but can Not do a lot but what do do well Extremophiles Microbes live in extreme conditions of Temperature Acidity Alkalinity Salinity Eubacteria vs Archaebacteria Biological definition of Organismal interactions Symbiosis a relationship between two different species Parasitism one org gets nutrients from another Mutualism both partners benefit Commensalisms one benefits more Other examples Biogeochemical cycles Matter can neither be created or destroyed A constant amount of matter in the environment must be recycled Microbes are essential in the conversion of nutrients into organic and usable formats Microbes are essential in the conversion of nutrients into the inorganic form The Biogeochemical cycles The carbon cycle Photoautotrophs Chemoautorophs Both convert inorganic forms of carbon into organic forms using external sources of energy Chemoheterotrophs release Inorganic form of carbon CO2 to complete the cycle Non living sinks include CaCO3 and fossil fuels The nitrogen cycle Local shortages because of Nitrogen stuff Microbes decompose proteins form dead cells and release amino acids Ammonia is liberated by microbial ammonificaiton of amino acids Ammonia is oxidized to produce nitrates for energy by nitrifying bacteria More nitrogen stuff Denitrifying bacteria reduce nitrogen in nitrates to molecular nitrogen N2 is converted into ammonia by nitrogen fixing bacteria Ammonium and nitrate are used by bacteria and plants to synthesize amino acids Fertilization and microbes Cyanobacteria for a symbiosis with small floating fern Azolla in rice paddy waters Sulfur cycle Plants and certain microbes can use SO42 to make amino acids H2S is oxidized to form SO42 Sulfur Cycle Proteins and waste products Amino acids SH H2S SO 2 4 Thiobacillus Microbial decomposition Microbial dissimilation H2S SO42 for energy by respiration Microbial plant assimilation Amino



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