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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

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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.
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Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism01:14

Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism

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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character,  phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
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sp3d and sp3d 2 Hybridization
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The Sulfur Cycle01:22

The Sulfur Cycle

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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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Bacterial Phylum Planctomycetes01:26

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Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
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Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Related Experiment Video

Updated: Oct 19, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

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Phosphine Generation Pathways on Rocky Planets.

Arthur Omran1, Christopher Oze2, Brian Jackson3

  • 1Department of Geosciences, University of South Florida, Tampa, Florida, USA.

Astrobiology
|September 22, 2021
PubMed
Summary
This summary is machine-generated.

Potential phosphine gas in Venus's atmosphere may stem from abiotic processes, not necessarily life. Researchers explored two non-biological pathways for phosphine generation on Venus.

Keywords:
AstrobiologyBiosignaturesDisproportionationImpactPhosphinePhosphorusVenus

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Area of Science:

  • Astrobiology
  • Planetary Science
  • Atmospheric Chemistry

Background:

  • The hypothesis of life in Venus's clouds, proposed in the 1960s, has been revived by recent potential phosphine (PH3) detections.
  • Phosphine detection in Venus's atmosphere raises questions about atmospheric/geochemical processes and the possibility of biological origins.
  • Understanding abiotic phosphorus chemistry is crucial for evaluating claims of extraterrestrial life based on phosphine detection.

Purpose of the Study:

  • To investigate potential abiotic routes for phosphine generation in Venus's atmosphere.
  • To assess whether non-biological processes can explain the observed phosphine levels on Venus.
  • To provide context for interpreting phosphine as a biosignature on Venus and other rocky planets.

Main Methods:

  • Discussion of two proposed abiotic pathways for phosphine production.
  • Assessment of phosphorus chemistry under Venus-relevant atmospheric and geochemical conditions.
  • Analysis of phosphine generation via impactor ablation and subcloud reduced phosphorus compounds.

Main Results:

  • Two abiotic mechanisms for phosphine generation in Venus's atmosphere are identified.
  • Corrosion of ablating impactors near the cloud layer is a potential source of phosphine.
  • Reduced phosphorus compounds in the subcloud layer may also produce phosphine.

Conclusions:

  • Abiotic processes, including impactor corrosion and subcloud chemistry, can plausibly generate phosphine on Venus.
  • The detected phosphine may be explained by these non-biological routes, potentially simplifying the search for life.
  • Phosphine detection alone is not definitive proof of life in Venus's clouds or on other rocky planets.