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Inorganic Nitrogen Assimilation

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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The Nitrogen Cycle

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Other Glycolytic Pathways

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Related Experiment Video

Updated: Apr 9, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Published on: December 20, 2016

Analysis of alternative pathways for reducing nitrogen oxide emissions.

Daniel H Loughlin¹, Katherine R Kaufman, Carol S Lenox

¹a Office of Research and Development , U.S. Environmental Protection Agency, Research Triangle Park , NC , USA.

Journal of the Air & Waste Management Association (1995)

|June 20, 2015

Summary

Reducing air pollution requires innovative strategies beyond traditional controls. Energy efficiency, renewable electricity, and vehicle electrification can significantly cut nitrogen oxides (NOx) and improve air quality nationwide.

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Area of Science:

Environmental Science
Energy Systems Analysis
Atmospheric Chemistry

Background:

Tropospheric ozone (O3) reduction strategies often focus on nitrogen oxides (NOx) controls for power plants, industry, and vehicles.
Traditional NOx controls may be insufficient to meet National Ambient Air Quality Standards for ozone in some U.S. regions.

Purpose of the Study:

To explore the potential for additional NOx reductions through electrification, energy efficiency, and renewable energy deployment.
To estimate the national and regional NOx implications of these alternative strategies using an energy system model.

Main Methods:

Application of the MARKet ALlocation (MARKAL) energy system model.
Sensitivity analysis of extensive passenger vehicle electrification, building energy efficiency/conservation, and electric sector wind/solar power deployment.

Main Results:

Energy efficiency and renewable electricity significantly reduce NOx beyond traditional control methods.
Widespread light-duty vehicle electrification yielded mixed regional results, with some areas showing increased NOx.
Combining vehicle electrification with renewable electricity consistently reduced NOx across all regions.

Conclusions:

State governments need effective plans to meet air quality standards.
Extensive adoption of energy efficiency, renewable electricity, and vehicle electrification offers substantial NOx reductions beyond current controls.