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The Nitrogen Cycle01:49

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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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Overview of Nitrogen Metabolism01:20

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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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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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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
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Dose Size and Dosing Frequency: Determination Methods01:21

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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Spectrophotometric Determination of Phycobiliprotein Content in Cyanobacterium Synechocystis
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Total Nitrogen Determination by a Spectrophotometric Method.

Jaana Koistinen1, Mervi Sjöblom2, Kristian Spilling3

  • 1Tvärminne Zoological Station, University of Helsinki, Hanko, Finland. jaana.koistinen@helsinki.fi.

Methods in Molecular Biology (Clifton, N.J.)
|February 9, 2019
PubMed
Summary

Measuring total nitrogen (TN) is crucial for tracking nitrogen budgets. This chapter details a spectrophotometric method using persulfate digestion and nitrate determination for accurate TN analysis.

Keywords:
Nutrient uptakeTotal nitrogen

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Water Quality Monitoring

Background:

  • Accurate measurement of total nitrogen (TN) is essential for understanding and managing nitrogen cycles and budgets.
  • Existing methods for TN determination require careful optimization and validation.

Purpose of the Study:

  • To present a reliable spectrophotometric method for determining total nitrogen (TN).
  • To provide a detailed protocol for TN analysis applicable to various environmental samples.

Main Methods:

  • The method involves a persulfate digestion step to oxidize all nitrogen compounds to nitrate.
  • Subsequent spectrophotometric determination of the resulting nitrate concentration is performed.
  • This process ensures the capture of diverse nitrogen forms, including organic and inorganic species.

Main Results:

  • The described spectrophotometric method provides accurate and reproducible measurements of total nitrogen.
  • The digestion and determination steps are optimized for sensitivity and efficiency.
  • The method is suitable for routine monitoring of total nitrogen in water and other matrices.

Conclusions:

  • The presented spectrophotometric method offers a robust approach for total nitrogen quantification.
  • This technique is valuable for environmental monitoring and nitrogen budget assessments.
  • The detailed protocol facilitates the implementation of reliable TN analysis in research and practice.