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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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Measurement: Standard Units03:38

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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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Measurement: Derived Units03:02

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The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
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Synthesis and Functionalization of Nitrogen-doped Carbon Nanotube Cups with Gold Nanoparticles as Cork Stoppers
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Doping Polycyclic Arenes with Nitrogen-Boron-Nitrogen (NBN) Units.

Deng-Tao Yang1, Tomoya Nakamura2, Zhechang He1

  • 1Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada.

Organic Letters
|October 24, 2018
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Summary

Researchers synthesized six novel polycyclic aromatic hydrocarbons (PAHs) featuring nitrogen-boron-nitrogen (NBN) units. These NBN-doped PAHs exhibit tunable fluorescence properties, opening avenues for advanced optoelectronic materials.

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

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are crucial in organic electronics.
  • Doping PAHs with heteroatoms can modify their optoelectronic properties.
  • Nitrogen-boron-nitrogen (NBN) units offer unique electronic characteristics.

Purpose of the Study:

  • To synthesize novel polycyclic aromatic hydrocarbons (PAHs) incorporating nitrogen-boron-nitrogen (NBN) units.
  • To investigate the structure-optoelectronic property relationships of these new NBN-doped PAHs.
  • To evaluate the photophysical properties, including fluorescence emission and quantum yields.

Main Methods:

  • Borylation reactions for introducing boron.
  • Oxidative coupling reactions for constructing polycyclic frameworks.
  • Spectroscopic techniques (UV-Vis absorption, fluorescence emission) for property characterization.

Main Results:

  • Successfully synthesized six new NBN-doped PAH compounds.
  • Observed distinct fluorescence emission colors across the synthesized compounds.
  • Quantified varying fluorescence quantum yields, indicating tunable photophysical behavior.

Conclusions:

  • The incorporation of NBN units into PAHs leads to diverse and tunable fluorescence properties.
  • These NBN-doped PAHs demonstrate potential for applications in organic light-emitting diodes (OLEDs) and other optoelectronic devices.
  • The study establishes a foundation for designing novel functional organic materials based on NBN-containing PAHs.