Lecture #19 - Temperature, pH, Salinity, O 2 concentration,...

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Lecture 19 Lecture 19 Chemical Linkages Between Cycles: How Microbial Metabolic Processes and Biogeochemical Cycles Are Linked to Each Other How Microbial Metabolic Processes and Linked to Each Other Review Lectures 1-18 – Bring Questions to Class Four Things to Remember About All Chemical Cycles of Elements Four Things to Remember About All Chemical Cycles of Elements 3. Most biochemical transformations happen inside cells 2. Microbes catalyze the majority of chemical transformations 1. An element never acts alone 4. Environmental factors control microbial guild activity Chemical Linkages = Redox reactions Community Structure and Guild Activity Cell Structure, Nutrition, and Metabolism Microenvironmental processes and surface effects
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Unformatted text preview: Temperature, pH, Salinity, O 2 concentration, radiation, Microbial Guilds Link The Nitrogen Cycle to C, H and O Cycles Microbial Guilds Link The Nitrogen Cycle to C, H O 2 H+ Organic C CO 2 H 2 CO 2 H 2 O N2 fixers Azotobacter spp. Cyanobacteria Clostridium spp. , Purple and green Photosynthetic Bacteria Methanogens Symbiotic N 2 fixers (plant symbionts): Rhizobium spp., Frankia spp. Denitrifiers (anaerobic respiration) e.g. Bacillus, Pseudomonas spp. Nitrifiers e.g. Nitrobacter spp. and Nitrosomonas spp Ammonifiers: Many different heterotrophs carry out ammonification...
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This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell University (Engineering School).

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Lecture #19 - Temperature, pH, Salinity, O 2 concentration,...

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