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Related Concept Videos

The Nitrogen Cycle01:49

The Nitrogen Cycle

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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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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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Inorganic Nitrogen Assimilation01:22

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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...
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Fixation and Sectioning01:03

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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Carbon-dioxide Fixation01:28

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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New Developments in Nitrogen Fixation.

Felix Tuczek1, Nicolai Lehnert1

  • 1Institut für Anorganische und Analytische Chemie der Universität, Staudingerweg 9, D-55099 Mainz (Germany), Fax: (+49) 6131-39-2990.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary
This summary is machine-generated.

Researchers explored novel reactions of dinitrogen (N₂) complexes with hydrogen (H₂) for ammonia synthesis. Key findings include a unique actinide complex and insights into synthetic nitrogen fixation, mimicking natural processes.

Keywords:
Bioinorganic chemistryMetalloenzymesNitrogen fixationNitrogenasesProtonations

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Area of Science:

  • Coordination chemistry
  • Inorganic chemistry
  • Catalysis

Background:

  • Mimicking natural nitrogen fixation at ambient conditions is a significant challenge.
  • Developing efficient synthetic routes for ammonia production is crucial for sustainable chemistry.

Purpose of the Study:

  • To explore novel reactions of dinitrogen (N₂) complexes with hydrogen (H₂).
  • To investigate the synthesis and structure of N₂-containing transition metal and actinide complexes.
  • To understand variations in synthetic nitrogen fixation relevant to enzymatic processes.

Main Methods:

  • Synthesis and characterization of novel transition metal and actinide complexes.
  • Investigation of reactivity with H₂ for N₂ transformation.
  • Structural analysis of N₂-bridged complexes.

Main Results:

  • Discovery of novel reactions involving N₂-containing transition metal complexes and H₂.
  • Elucidation of the first side-on N₂-bridged structure of an actinide complex.
  • Identification of unique synthetic pathways for nitrogen fixation.

Conclusions:

  • The study presents significant advancements in synthetic nitrogen fixation.
  • The findings offer new perspectives on mimicking enzymatic nitrogen fixation.
  • The developed methodologies contribute to the long-term goal of ammonia production under mild conditions.