Measurement and ecological importance of nitrogen fixation
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Nitrogen fixation refers to the conversion of atmospheric nitrogen gas into a form usable by plants and other organisms. Nitrogen fixation is conducted by a variety of bacteria, both as free-living organisms and in symbiotic association with plants. Because it is the principal source of the nitrogen in the soil, nitrogen that plants need to grow, nitrogen fixation is one of the most important biochemical processes on Earth.
Living organisms need nitrogen because it is a part of the amino acids that make up proteins , and the nucleic acids that make up DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Nitrogen within living organisms is eventually decomposed and converted to atmospheric nitrogen. This form, however, is highly stable and unreactive chemically, and is therefore not available for use by most organisms. Some species of bacteria, though, can convert N2 into NH3(ammonia) or other usable forms of nitrogen. These nitrogen-fixing bacteria include species of the genera Rhizobium, Anabaena, Azotobacter, and Clostridium, as well as others.
Living organisms need nitrogen because it is a part of the amino acids that make up proteins , and the nucleic acids that make up DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Nitrogen within living organisms is eventually decomposed and converted to atmospheric nitrogen. This form, however, is highly stable and unreactive chemically, and is therefore not available for use by most organisms. Some species of bacteria, though, can convert N2 into NH3(ammonia) or other usable forms of nitrogen. These nitrogen-fixing bacteria include species of the genera Rhizobium, Anabaena, Azotobacter, and Clostridium, as well as others.
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