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相关概念视频

2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

4.0K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Overview of Nitrogen Metabolism01:20

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.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
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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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The Equilibrium Constant03:11

The Equilibrium Constant

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Consider the oxidation of sulfur dioxide:
46.7K
Calculating Equilibrium Concentrations02:05

Calculating Equilibrium Concentrations

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Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
A more...
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Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

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An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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相关实验视频

Updated: Jun 5, 2025

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
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Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers

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在排放清单中包括化和化抑制剂的影响的先决条件

Nicholas J Hutchings1, Søren O Petersen2, Karl G Richards3

  • 1Climate and Water Section, Department of Agroecology, Aarhus University, Tjele, Denmark.

Global change biology
|December 6, 2024
PubMed
概括
此摘要是机器生成的。

尿酶和化抑制剂减少了排放,但现实世界的条件是关键. 我们概述了包括它们在监管排放清单中的已证明影响的标准.

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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科学领域:

  • 农业科学 农业科学
  • 环境科学环境科学
  • 土壤科学 土壤科学

背景情况:

  • 农业来源的氨和温室气体排放是严重的环境问题.
  • 尿酶和化抑制剂提供了一种潜在的解决方案,以减轻来自肥料和便的这些排放.
  • 这些抑制剂的有效性高度依赖于环境和应用条件.

研究的目的:

  • 建立评估尿酶和化抑制剂实际有效性的标准.
  • 确保在监管排放清单中使用的减排数据的可信性.
  • 引导将抑制作用纳入官方环境报告中.

主要方法:

  • 审查现有的关于各种条件下的抑制剂疗效的科学文献.
  • 定义基于现场的性能验证的具体,可测量的标准.
  • 提出一个框架来评估与监管标准相关的抑制剂性能.

主要成果:

  • 抑制剂的有效性因土壤类型,气候和应用方法而异.
  • 实验室的结果并不总是转化为实际的减排.
  • 需要一种标准化,基于证据的方法来获得监管机构的接受.

结论:

  • 监管排放清单必须包含在实际农业条件下验证的抑制作用.
  • 清晰,以证据为基础的标准对于可靠评估抑制剂性能至关重要.
  • 采用这些标准将提高农业排放环境报告的准确性和可信度.