Talk:Diazotroph

Anaerobes, or provided with mechanisms to protect the nitrogen-fixing from destruction by oxygen. An important aspect not yet touched on. --Wetman 00:38, 30 July 2005 (UTC)[reply]

I believe I have addressed this now. --Satyrium 23:24, 3 August 2006 (UTC)[reply]

Deletion request

I created this article in error while fixing links. The article Diazotrophs needs moving here, but due to a brain lapse I copied the article text over to this new page instead of using the move button, and made the old page a redirect, thus divorcing the contents from the edit history. I've reverted my edits, but until this page is deleted I can't finish the job properly. Sorry for the error! ~ Veledan | Talk | c. 08:59, 30 July 2005 (UTC)[reply]

I've deleted the redirect and moved the page. Eugene van der Pijll 10:25, 30 July 2005 (UTC)[reply]

-Changed heterocyst function under cyanobacteria from 'sequester' to 'exclude' O2.

The comment, "All diazotrophs contain iron-molybdenum nitrogenase systems," may be in error. There are at least three different variants of the nitrogenase enzyme as defined by the metal atoms bound at the enzyme's active site. These are the Mo-Fe, V-Fe, and Fe-Fe nitrogenases. The V-Fe and Fe-Fe nitrogenases go by the title alternative nitrogenases. The Mo-Fe active site is the most efficient and thus most wide-spread, however these other variants exist and may be important in low [Mo] environments. Some organisms (e.g. Azotobacter) can produce all three enzymes, but I am unsure whether or not there are organisms which contain *only* alternative nitrogenases. 74.71.232.28 (talk) 12:03, 10 February 2008 (UTC)[reply]

Maybe we could fix it, if you added a reference to prove this information true. —Preceding unsigned comment added by Vojtech.dostal (talk • contribs) 11:16, 22 March 2008 (UTC)[reply]

Unclear sentence

I find this sentence from the 'importance' section confusing: "In terms of generating nitrogen available to all organisms, the symbiotic associations greatly exceed the free-living species with the exception of cyanobacteria." What is the "free living" species and what does it mean for a symbiotic association to greatly exceed it? N^oformation ^Talk 00:15, 3 October 2013 (UTC)[reply]

Reference and clarification needed

This sentence needs a reference: "Fixation is shut off when other sources of nitrogen are available, and, for many species, when oxygen is at high partial pressure." Relatedly, a few lines explaining how oxygen in general interferes with the activity of nitrogenases would help the reader grasp the connection. ~~~~ Ephemeropterid (talk) 21:20, 7 October 2024 (UTC)[reply]