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関連する概念動画

The Phosphorus Cycle01:21

The Phosphorus Cycle

43.5K
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.
43.5K
Factors Affecting Solubility04:01

Factors Affecting Solubility

36.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
36.5K
Primary Production01:06

Primary Production

25.0K
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.
25.0K
Phosphorylation01:02

Phosphorylation

53.5K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
53.5K
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

14.9K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
14.9K
Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

10.0K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
10.0K

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関連する実験動画

Updated: Jan 8, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

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フィールドから流出イベント中の河川への動的リン形態の変化

Rebecca M Kreiling1, Tanja N Williamson2, Faith A Fitzpatrick3

  • 1U.S. Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin, USA.

Journal of environmental quality
|December 17, 2025
PubMed
まとめ

農業流出は、リン（P）輸送を通じて水質に影響を与える。畑からの溶存Pは、河川中の懸濁堆積物（SS）に結合し、下流での生物利用能を低下させる可能性がある。

キーワード:
農業流出リン輸送懸濁堆積物生物利用能水質汚染

さらに関連する動画

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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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

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関連する実験動画

Last Updated: Jan 8, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
06:42

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

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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

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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

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科学分野:

  • 環境化学; 水質科学; 農業科学

背景:

  • 農業流出は、水域に影響を与える栄養汚染の主要な発生源である。リン（P）は、その環境運命と生物利用能に影響を与える溶存形態と粒子状形態で存在する。輸送中の形態間のPの変換は、水生生態系への影響を及ぼす。

研究 の 目的:

  • 農業流出水および受信河川水中のリン（P）の形態と量を定量化すること。フィールド流出と河川環境の間で、懸濁堆積物（SS）へのPの種分化と吸着を比較すること。農業フィールドから河川への輸送中にPの生物利用能がどのように変化するかを理解すること。

主な方法:

  • 2022年3月から2023年6月にかけてウィスコンシン州イーストリバー流域で5回の流出イベント中に表面流出水と河川水のサンプルを収集した。収集したサンプル中のPの形態（溶存および粒子状）と量を分析した。懸濁堆積物（SS）の粒子径とP吸着容量を特徴付けた。

主要な成果:

  • 表面流出水は主に溶存Pを含み、粒子状Pは微細な粘土に吸着されていた。河川水は、微細な粘土が豊富であるにもかかわらず、主にシルトに吸着された粒子状Pを含んでいた。SSのP濃縮は、低流速および小規模な流出イベント中に増加し、輸送中のP吸着を示唆した。

結論:

  • フィールド流出（溶存）から河川水（粒子状）へのP形態の変化が見られ、溶存PがSSに吸着されることを示唆している。この吸着プロセスはPの生物利用能を変化させ、下流に輸出される生物利用可能Pの量を減少させる可能性がある。農業流域におけるPの動態を理解することは、水質管理と富栄養化の軽減にとって極めて重要である。