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Nitrogen fixation

nitrogen fixation

(Science: biochemistry) The incorporation of atmospheric nitrogen into ammonia by various bacteria, catalysed by nitrogenase.

This is an essential stage in the nitrogen cycle and is the ultimate source of all nitrogen in living organisms. In the sea, the main nitrogen fixers are cyanobacteria.

There are several free living bacteria in soil that fix nitrogen including species of azotobacter, clostridium and klebsiella. Rhizobium only fixes nitrogen when in symbiotic association, in root nodules, with leguminous plants. The oxygen sensitive nitrogenase is protected by plant produced leghaemoglobin and the plant obtains fixed nitrogen from the bacteria.

See: frankia. The assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria.A capability of some bacteria to harness nitrogen from the open air environment and use it to synthesises [[amino acids.


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Gottschalk Bacterial Metabolism. 2nd edition Springer Verlag

... Bacterial Metabolism. 2nd edition Springer Verlag Bacically Chapter 10: Fixation of Molecular Nitrogen . I got the chapter from Google Book but Images are omitted. Plz someone help me toprovide ...

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by analkundu
Tue Apr 17, 2012 3:32 am
 
Forum: Microbiology
Topic: Gottschalk Bacterial Metabolism. 2nd edition Springer Verlag
Replies: 0
Views: 855

plant biotech- How Rhiobium absorbs N2 from atmosphere?

... .It cause Root Nodules under the soil. . Then, How atmospheric nitrogen is absorbed for N2 fixation ? Plz clear my doubts.

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by barathvaj
Thu Feb 09, 2012 1:43 pm
 
Forum: General Discussion
Topic: plant biotech- How Rhiobium absorbs N2 from atmosphere?
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Views: 902

Re: Multicellular prokaryote

... some cells differentiate into heterocysts which are specialized for nitrogen fixation and (as far as I remember) they don't carry out photosynthesis, the other cells in ...

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by Adz795
Sun Feb 05, 2012 8:42 am
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17568

Multicellular prokaryote

... become harsh; and thick-walled heterocysts, which contain the enzyme nitrogenase, vital for nitrogen fixation. That just means they are not true multicellular prokaryotes.

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by Adz795
Sat Jan 07, 2012 7:59 am
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17568

Plant root cells

... anything like transport inhibition or sensitivity to oxygen like with nitrogen fixation...

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by JackBean
Sun Feb 28, 2010 11:53 am
 
Forum: Cell Biology
Topic: Plant root cells
Replies: 5
Views: 6546
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