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相关概念视频

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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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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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Primary Production01:06

Primary Production

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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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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相关实验视频

Updated: Jul 7, 2025

Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management
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Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management

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大气污染控制有利于沿海环境

Ouping Deng1,2, Shuai Huang1, Chen Wang2

  • 1College of Resources, Sichuan Agricultural University, Chengdu 611130, China.

Environmental science & technology
|December 22, 2023
PubMed
概括

中国每年将800万的转移到海洋中,主要来自农业和污水. 减少空气污染,特别是氨和氧化排放,是减轻海洋污染的关键.

关键词:
减排措施 减排措施大气中的沉积物.沿海环境 沿海环境这就是的酸.排水过程中的排水.

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

  • 环境科学 环境科学
  • 海洋学 海洋学 海洋学
  • 生物地质化学生物地质化学

背景情况:

  • 是海洋生态系统中关键的限制营养素.
  • 自工业前时代以来,陆地气输入海洋的量大幅增加.
  • 中国是全球循环的主要贡献者,但陆海运输的途径和来源尚未得到充分了解.

研究的目的:

  • 为了量化从中国到海洋的转移.
  • 确定气运输的主要来源和途径.
  • 评估潜在的减缓战略,以减少海洋污染.

主要方法:

  • 综合建模方法结合了CHANS,WRF-Chem和WNF模型.
  • 2017年将转移到海洋的估计.
  • 对大气沉积对海上叶绿素度的影响分析.
  • 确定主要贡献的行业和地区.

主要成果:

  • 据估计,2017年从中国向海洋转移了800万 (Tg) 的.
  • 大气沉积占总气输入的三分之一,解释了近海叶绿素度变化的约一半.
  • 博海海域的气输入量最高 (214公斤N ha-1),远远超过其他地区.
  • 农业系统 (55%) 和家庭污水 (21%) 是出口的最大贡献者.

结论:

  • 缓解措施可以将气出口到海洋的数量减少43%.
  • 通过减少氨和氧化排放来解决空气污染问题对于海洋保护至关重要,为潜在的减少贡献33%.
  • 优先考虑农业和运输部门的缩,为海洋环境带来最具成本效益的好处.