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関連する概念動画

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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関連する実験動画

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

世界的窒素・リン不均衡

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
まとめ

自然生態系の不均衡は 生物多様性や世界の食糧安全保障に 大きな脅威をもたらします この不均衡に対処することは 環境の健康と持続可能な農業にとって極めて重要です

科学分野:

  • エコロジー
  • 環境科学
  • 農業科学

背景:

  • 自然の生態系は前例のない不均衡を経験しています
  • これらの不均衡は 重要な生態系を乱します
  • このような混乱は 広範囲に及ぶ影響を及ぼします

研究 の 目的:

  • 生態学的不均衡の結果を調査する.
  • 自然生態系への影響を強調する
  • 世界の食糧安全保障への影響を評価する.

主な方法:

  • 環境調査とデータ分析
  • 食品安全の評価について
  • 生態系サービスの評価

主要な成果:

  • 生物多様性への重大な悪影響が認められた.
  • 生態系サービスにおける障害が特定された.
  • 世界的な食糧生産に対する脅威が 文書化されています

結論:

  • エコロジカルな不均衡は深刻な結果をもたらします

さらに関連する動画

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
10:29

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

Published on: March 21, 2016

12.5K
Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

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

Published on: March 6, 2014

17.5K

関連する実験動画

Last 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
Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
10:29

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

Published on: March 21, 2016

12.5K
Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

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

Published on: March 6, 2014

17.5K
  • 生態系のバランスを取り戻すには 緊急の行動が必要です
  • 緩和戦略は食糧安全保障に不可欠です