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Ecology Big Ideas
Ecology Big Ideas

... average annual CO2 concentration. CO2 levels are recorded in parts per million (ppm). This is the number of CO2 molecules in every one million molecules of the atmosphere. Study this graph and answer the questions below it. 1. What conclusions can be drawn from this graph? ...
Chapter 10 Babbey
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Nutrient Removal by Crops in North Carolina | NC State Extension
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... losses of 50 percent because of leaching, volatilization, or denitrification. Consequently, crop removal values reflect a minimum amount of nitrogen required because they do not account for nitrogen losses. Legumes produce most of their own nitrogen through a symbiotic, or beneficial, relationship w ...
Amino Acid Catabolism
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... ary considerably, but all amino acids are degraded to one of seven metabolites: ...
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Ecology Stations - Wheatmore Science
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Amino Acid Catabolism - Chemistry Courses: About
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... More notably, P. macerans has the ability to fix nitrogen that is very beneficial towards crops productivity. Biological nitrogen fixers accounted for supplying nearly 60 % of world’s new ammonia source annually (Schlesinger, 1991). It is vital to harness research understanding on biological nitroge ...
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... Nitrogen gas is common in the atmosphere, but most living things cannot use nitrogen gas in their cells. Organisms need nitrogen in a more chemically reactive form. Certain types of bacteria can use nitrogen from the atmosphere. Such nitrogen-fixing bacteria produce ammonia. Nitrogen-fixing bacteria ...
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Alkaloid
Alkaloid

... nitrogen that can be used by all organisms. Just as carbon fixation can be performed by only certain organisms (eg. photosynthetic), nitrogen fixation is performed only by a small number of bacterial species, including symbiotic bacteria (Rhizobium) in the roots of leguminous plants. As you might pr ...
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Nitrogen cycle



The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
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