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相关概念视频

The Phosphorus Cycle01:21

The Phosphorus Cycle

39.6K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
39.6K
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

9.3K
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...
9.3K
The Nitrogen Cycle01:49

The Nitrogen Cycle

55.1K
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...
55.1K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

146
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...
146
Primary Production01:06

Primary Production

24.2K
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.
24.2K
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

483
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
483

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相关实验视频

Updated: Oct 6, 2025

Design and Construction of an Urban Runoff Research Facility
13:48

Design and Construction of an Urban Runoff Research Facility

Published on: August 8, 2014

13.2K

全球和不平衡

Josep Peñuelas1,2, Jordi Sardans1,2

  • 1Consejo Superior de Investigaciones Científicas (CSIC), Global Ecology Unit CREAF-CSIC-UAB (Universitat Autònoma de Barcelona), Bellaterra 08193, Barcelona, Catalonia, Spain.

Science (New York, N.Y.)
|January 20, 2022
PubMed
概括

自然生态系统的不平衡对生物多样性和全球粮食安全构成重大威胁. 解决这种不平衡对于环境健康和可持续农业至关重要.

科学领域:

  • 生态学
  • 环境科学
  • 农业科学

背景情况:

  • 自然生态系统正在经历前所未有的失衡.
  • 这些不平衡破坏了重要的生态过程.
  • 这种干扰会带来深远的影响.

研究的目的:

  • 调查生态失衡的后果.
  • 强调对自然生态系统的影响.
  • 评估对全球粮食安全的影响.

主要方法:

  • 生态调查和数据分析.
  • 食品安全评估
  • 生态系统服务评估.

主要成果:

  • 对生物多样性的显著负面影响.
  • 发现了生态系统服务的中断.
  • 记录了对全球粮食生产的威胁.

结论:

  • 生态不平衡带来严重后果.
  • 需要采取紧急行动恢复生态系统的平衡.

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

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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相关实验视频

Last Updated: Oct 6, 2025

Design and Construction of an Urban Runoff Research Facility
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Design and Construction of an Urban Runoff Research Facility

Published on: August 8, 2014

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

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

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  • 减缓战略对于粮食安全至关重要.