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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

4.3K
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.
4.3K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

48
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...
48
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

8.1K
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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相关实验视频

Updated: Jul 20, 2025

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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酸盐浸泡预处理诱导了最初的化酸盐积累.

Ji Zhao1, Yuzhe Wu1, Jimiao Wang2

  • 1School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.

Bioresource technology
|August 6, 2023
PubMed
概括

化浸泡预处理有效地加速了部分脱 (PD) 的启动. 这种方法增强了酸盐的积累,使PD更适合研究和应用.

关键词:
脱化酸盐的积累 脱化酸盐积累微生物社区的微生物社区.化物浸泡浸泡化物部分脱化部分脱化预处理的前期处理

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

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相关实验视频

Last Updated: Jul 20, 2025

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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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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科学领域:

  • 环境微生物学环境微生物学
  • 水处理技术水处理技术.

背景情况:

  • 部分脱 (PD) 是一种生产亚酸盐的方法.
  • PD的缓慢启动限制了其实际应用和研究.

研究的目的:

  • 调查酸盐浸泡作为预处理加速PD启动.
  • 优化酸盐浸泡条件,以提高酸盐的积累.

主要方法:

  • 微生物群落的预处理使用酸盐浸泡.
  • 不同的亚酸盐度和浸泡时间.
  • 监测不同条件下的脱化酸盐积累,包括高pH值和频繁养.

主要成果:

  • 化物浸泡9小时以10毫克/升的化物启动PD,累积4.20毫克/升.
  • 用20毫克/升的酸盐浸泡6小时,产生了最高的积累量 (4.92毫克/升).
  • 高pH (9) 和频繁养进一步改善了酸盐的积累.

结论:

  • 酸盐浸泡是快速启动PD的有效预处理方法.
  • 优化的浸泡条件和操作参数 (pH,养) 提高了酸盐的积累.
  • 预处理引起的微生物社区转移有利于PD而不是完全脱化.