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Carbon and Nitrogen Cycles

Carbon and Nitrogen Cycles What process? ? What does it need? Microbiology: An Evolving Science 2009 W. W. Norton & Company, Inc. 2. Biogeochemical Cycles n All living organism elements flow in Cycles Rate of cycling varies n Biomass vs. organic n Environment: atmospheric, land, or ocean n Lack of necessary elements limits growth Iron Phosphorus Fixed Nitrogen Micronutrients Microbiology: An Evolving Science 2009 W. W. Norton & Company, Inc. 3. Biogeochemical Cycles n Elements move from large sources to sinks Reservoirs provide both n Ocean important for Carbon , Nitrogen n Land important for sulfur n Oxidation state governs element reactivity Nitrogen gas plentiful, fixed Nitrogen rare n Measure elements in atmosphere via Chemical reactions Radioactivity measurements Microbiology: An Evolving Science 2009 W. W. Norton & Company, Inc.

Biogeochemical Cycles ! Elements move from large sources to sinks " Reservoirs provide both ! Ocean important for carbon, nitrogen ! Land important for sulfur ! Oxidation state governs element reactivity " Nitrogen gas plentiful, fixed nitrogen rare ! Measure elements in atmosphere via " Chemical reactions

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