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The Phosphorus Cycle

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.

Introduction to Electrolytes

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 Phosphate

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...

Phosphorylation

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 Production

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.

Phosphoinositides and PIPs

Phosphoinositides and PIPs

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...

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Related Experiment Video

Updated: Jul 30, 2025

Assaying for Inorganic Polyphosphate in Bacteria

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

Phosphate availability and implications for life on ocean worlds.

Noah G Randolph-Flagg^1,2,3, Tucker Ely^4,5,6, Sanjoy M Som^7,8

¹Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, Mountain View, CA, USA. nrflagg@berkeley.edu.

Nature Communications

|May 15, 2023

Summary

This summary is machine-generated.

Phosphorus availability on ocean worlds may support life. Calculations show phosphate concentrations could sustain microbial growth and large ocean populations, suggesting habitability potential beyond Earth.

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Last Updated: Jul 30, 2025

Assaying for Inorganic Polyphosphate in Bacteria

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Published on: January 21, 2019

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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

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

Published on: March 6, 2014

Area of Science:

Astrobiology
Geochemistry
Planetary Science

Background:

Outer solar system moons possess subsurface liquid water oceans, making them targets for habitability assessments.
Life requires essential elements, including phosphorus, which can be a limiting nutrient in Earth's oceans.
The availability of phosphorus is crucial for determining the potential for life on ocean worlds.

Purpose of the Study:

To calculate equilibrium dissolved phosphate concentrations in ocean world scenarios.
To assess if calculated phosphate levels can support life's requirements.

Main Methods:

Modeling geochemical reactions between water and rocks under various conditions.
Simulating a range of planetary compositions, including carbonaceous chondrites.
Comparing calculated phosphate concentrations with microbial requirements on Earth.

Main Results:

Equilibrium dissolved phosphate concentrations varied widely, from 10^-11 to 10^-1 mol/kg.
Most plausible scenarios yielded phosphate concentrations greater than 10^-5 mol/kg.
These concentrations are sufficient to support rapid microbial growth and large cell populations.

Conclusions:

The calculated phosphate levels suggest that ocean worlds could possess sufficient phosphorus for life.
This finding supports the potential habitability of ocean worlds in the outer solar system.
Further research into ocean world geochemistry is warranted to fully assess habitability.