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関連する概念動画

The Phosphorus Cycle01:21

The Phosphorus Cycle

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.
Factors Affecting Solubility04:01

Factors Affecting Solubility

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:
Introduction to Electrolytes01:33

Introduction to Electrolytes

In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
Role of Sodium
One...
Roles of Electrolytes: Calcium and Phosphate01:27

Roles of Electrolytes: Calcium and Phosphate

Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
The calcium concentration in blood plasma is primarily regulated...
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Freshwater Microbial Ecology01:24

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...

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Updated: Jun 19, 2026

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

湖のリン酸塩濃度について

J J Hudson1, W D Taylor, D W Schindler

  • 1Department of Biological Sciences, University of Alberta, Edmonton, Canada. hudsonje@ene.gov.on.ca

Nature
|July 14, 2000
PubMed
まとめ
この要約は機械生成です。

新しい放射線バイオアッセイでは,湖のピコモラーリン酸塩濃度が,以前の推定値より著しく低いことが明らかになりました. 微生物は,これらの低い栄養分レベルでも急速な周回を達成し,既存の生態学的モデルに挑戦します.

さらに関連する動画

Assaying for Inorganic Polyphosphate in Bacteria
07:20

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

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

関連する実験動画

Last Updated: Jun 19, 2026

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

Assaying for Inorganic Polyphosphate in Bacteria
07:20

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

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

科学分野:

  • 環境科学 環境科学
  • 微生物学 微生物学とは
  • リムテクノロジーとは

背景:

  • リン酸は,水生生態系における微生物の生産を制限する重要な栄養素です.
  • リンが限られた水域でのリン酸塩濃度測定のための既存の方法は,しばしば実際のレベルを過大評価します.
  • 精密なリン酸塩測定は,微生物の動態と栄養素の循環を理解するために不可欠です.

研究 の 目的:

  • 様々な湖系におけるリン酸塩濃度の正確な測定のための新しい放射生物測定法を開発し,適用する.
  • 新しい測定値を既存の光譜光度測定およびリグラー放射生物測定データと比較する.
  • リン酸濃度,総リン酸,湖のトロフィック状態との関係を調査する.

主な方法:

  • フォスファート濃度を測定するために,新しい安定状態放射生物測定法が採用されました.
  • 調査は,様々な湖の環境で実施されました.
  • データは,既存の文献値と組み合わせて分析されました.

主要な成果:

  • 酸塩濃度は,標準的な方法を使用して以前に推定されたよりも数桁低いことが判明しました.
  • 微生物コミュニティは,ピコモラーリン酸塩濃度で急速な転移率を示した.
  • 総リン量が増えたにもかかわらず,リン酸の比率はオリゴトロフ湖からユートロフ湖へと減少した.

結論:

  • 新しい放射生物測定法により,水生システムにおける生物利用可能なリン酸塩のより正確な評価が可能です.
  • 微生物の生命は,非常に低いリン酸濃度でも繁栄し,急速な活動を示すことができます.
  • この発見は,水中の環境における栄養素制限と微生物の反応を再評価することを必要としています.