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Questions tagged [nitrogen-cycle]

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In biological nitrogen fixation, the electrons required to reduce dinitrogen to ammonia are provided by which compound? [closed]

The reaction is as follows: N2 + 16ATP + 8e- + 8H+ → 2NH3 + H2 + 16ADP + 16Pi From where are the 8 electrons coming from? We know that in photosynthesis, the electrons are supplied by the oxidation ...
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Why is urea not converted to ammonia in the body?

After the liver processes metabolites to produce urea and other by-products, these travel in the blood to the heart, then they are oxygenated, and some travel through the renal artery to the kidneys. ...
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What is Nitrogen use efficiency?

Does NUE include a term of harvest index or not? I find different uses in different contexts, and no authoritative definition. Different authors use each others results but change the definition. ...
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Nitrogen Cycle (Use of nitrogen)

I just have a quick question regarding my textbook. In my textbook, it says that during nitrogen fixation the nitrogen gas found in air is converted to ammonium ions which can then be used by the ...
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Difference between bacteria and bacteroids?

During nodule formation Rhizobium is converted to bacteroids. What's the difference between them?
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Why do soil bacteria produce nitrous oxide as a result of anhydrous ammonia fertilizer application?

The NPR article and 4 minute audio news item Can Anyone, Even Walmart, Stem The Heat-Trapping Flood Of Nitrogen On Farms? discusses unexpected contributions of greenhouse gasses from the manufacture ...
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Recycling and storage of nitrogen from breakdown of macromolecules?

If nitrogen is so important (it's a constituent of both proteins and nucleic acids), why are animals still throwing them out, and needing to eat it again? Is it true that in almost a billion years of ...