Sandbox Reserved 640: Difference between revisions
From Proteopedia
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 24: | Line 24: | ||
Microorganisms that fix nitrogen are known as diazotrophs. The main problem occurring for these organisms is the oxygen that interferes with nitrogenase, the enzyme that converts the nitrogen to ammonia. The problem lies in the fact that some organisms need oxygen to live, but need it not interfere with nitrogenase. Others fare better by living in low oxygen environments, so no help is necessary <ref name=ten>Postgate, J (1998). Nitrogen Fixation, 3rd Edition. Cambridge University Press, Cambridge UK.</ref> | Microorganisms that fix nitrogen are known as diazotrophs. The main problem occurring for these organisms is the oxygen that interferes with nitrogenase, the enzyme that converts the nitrogen to ammonia. The problem lies in the fact that some organisms need oxygen to live, but need it not interfere with nitrogenase. Others fare better by living in low oxygen environments, so no help is necessary <ref name=ten>Postgate, J (1998). Nitrogen Fixation, 3rd Edition. Cambridge University Press, Cambridge UK.</ref> | ||
The diazotrophs are split into two categories, one being free-living and the other symbiotic. The free-living diazotrophs don’t need Leghemoglobin for nitrogen fixation as they have their own way of staying away from oxygen. These evolutions could vary, including living in low-oxygen areas or respiring oxygen quickly enough to keep levels low (Ref | The diazotrophs are split into two categories, one being free-living and the other symbiotic. The free-living diazotrophs don’t need Leghemoglobin for nitrogen fixation as they have their own way of staying away from oxygen. These evolutions could vary, including living in low-oxygen areas or respiring oxygen quickly enough to keep levels low. <ref name=ten /> (Ref 11). | ||
Organisms that use Leghemoglobin form root nodules that are important symbiotically with different types of bacteria. The legume family Fabecea consists of the species using Leghemoglobin, with some minor exceptions. Examples of organisms in this family are clovers, soybeans, alfalfa, lupines, and peanuts <ref name=ten /> (Ref 11). | Organisms that use Leghemoglobin form root nodules that are important symbiotically with different types of bacteria. The legume family Fabecea consists of the species using Leghemoglobin, with some minor exceptions. Examples of organisms in this family are clovers, soybeans, alfalfa, lupines, and peanuts <ref name=ten /> (Ref 11). | ||
