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Phosphorylation01:02

Phosphorylation

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...
Primary Production01:06

Primary Production

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.
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...

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Phytochrome in etiolated annual rye : I. Changes during growth in the amount of photoreversible phytochrome in the coleoptile and primary leaf.

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Related Experiment Video

Updated: Jul 11, 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

Phosphorus: a rate limiting nutrient in surface waters.

D L Correll1

  • 1Smithsonian Environmental Research Center, Edgewater, Maryland 20137, USA. CORRELL@SERC.SI.edu

Poultry Science
|May 6, 1999
PubMed
Summary

This study explores how phosphorus affects water quality in lakes, rivers, and coastal areas. Phosphorus is a key nutrient that supports the growth of algae and other plants in water. When too much phosphorus is present, it can cause algal blooms that reduce oxygen levels, harming aquatic life. The study finds that phosphorus is the main cause of eutrophication in freshwater systems. It also explains that phosphorus can be released from sediments under low-oxygen conditions, making the problem worse. The researchers suggest that measuring total phosphorus levels in water is the best way to monitor and manage this issue. They also highlight the importance of considering both nitrogen and phosphorus in estuaries and coastal waters. The study provides guidance on how to prevent and control eutrophication through better nutrient management.

Keywords:
aquatic nutrient cyclingwater quality monitoringphosphorus limitationalgal bloom causes

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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

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

Related Experiment Videos

Last Updated: Jul 11, 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

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

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

Area of Science:

  • Aquatic ecology
  • Nutrient cycling in freshwater systems
  • Environmental chemistry

Background:

Eutrophication remains a widespread issue in surface waters, yet the specific role of phosphorus in driving this process is not fully understood. Prior research has shown that nitrogen often controls primary production in marine environments, while phosphorus is more influential in freshwater. However, the mechanisms by which phosphorus contributes to eutrophication in different aquatic systems remain unclear. In freshwater lakes and reservoirs, phosphorus is known to be a major driver of algal blooms and oxygen depletion. The transition zones like estuaries and continental shelves complicate this picture, as both nitrogen and phosphorus can contribute to over-enrichment. The release of phosphorus from sediments under low-oxygen conditions further exacerbates the problem. Understanding the sources and forms of phosphorus is essential for managing water quality. This gap motivated the need to clarify the role of phosphorus in eutrophication across various aquatic systems.

Purpose Of The Study:

This study aims to clarify the role of phosphorus in eutrophication across different aquatic environments. The specific problem addressed is the variability in phosphorus's influence on primary production and ecosystem health. The motivation stems from the need to develop effective management strategies for nutrient inputs. The study focuses on how phosphorus contributes to algal overgrowth and oxygen depletion. It also examines the differences between freshwater and marine systems in terms of nutrient limitation. The researchers aim to identify the most reliable indicators of phosphorus-driven eutrophication. They also seek to understand how phosphorus release from sediments affects long-term water quality. This work is intended to inform policy and monitoring practices for nutrient regulation.

Main Methods:

The study reviews existing literature on phosphorus and eutrophication. It analyzes how phosphorus enters and cycles through aquatic ecosystems. The researchers compare freshwater and marine nutrient dynamics. They assess the role of organic and inorganic phosphorus forms. The study evaluates the impact of phosphorus on algal growth and oxygen levels. It examines the feedback loops between phosphorus release and eutrophication. The researchers consider the effectiveness of different phosphorus measurement methods. They also evaluate the use of N:P ratios in phytoplankton as a diagnostic tool.

Main Results:

The study finds that phosphorus is the primary driver of eutrophication in freshwater systems. It shows that orthophosphate is the only form usable by autotrophs. The research confirms that organic phosphorus must be hydrolyzed before assimilation. It reveals that phosphorus release from sediments under low oxygen conditions worsens eutrophication. The study notes that excessive phosphorus leads to algal blooms and oxygen depletion. It identifies that total phosphorus concentration is the best indicator of eutrophication risk. The analysis shows that N:P ratios in phytoplankton can also be a useful measure. The findings suggest that managing phosphorus inputs is critical for preventing eutrophication.

Conclusions:

The authors conclude that phosphorus is a key nutrient in freshwater eutrophication. They note that phosphorus limitation is more common in lakes and reservoirs than in marine systems. The study suggests that measuring total phosphorus is more effective than measuring individual forms. The researchers propose that N:P ratios in phytoplankton can help assess nutrient balance. They emphasize the importance of controlling phosphorus inputs to prevent algal overgrowth. The study highlights the feedback loop between phosphorus release and eutrophication. It suggests that estuaries and continental shelves require special attention due to dual nutrient influences. The authors recommend that total phosphorus monitoring should be a priority in water quality management.

Phosphorus promotes algal growth, which leads to oxygen depletion and hypoxia in water bodies.

Autotrophs cannot assimilate organic phosphorus without extracellular enzymes breaking it down into orthophosphate.

Total phosphorus includes all forms, providing a more accurate indicator of eutrophication risk than individual measurements.

N:P ratios help assess nutrient balance and identify whether phosphorus or nitrogen is the limiting factor.

Low oxygen causes the release of phosphorus from sediments, which can worsen eutrophication.

The authors recommend measuring and regulating total phosphorus inputs to prevent eutrophication.