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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Complement System

The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
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Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...

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Wildfire-Altered Soil Water-Extractable Organic Matter Drives Divergent Greenhouse Gas Emissions in Anaerobic Subsurface Soils.

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Wildfire-Derived Pyrogenic Dissolved Organic Matter (pyDOM) Enhances Riverine DOM Reactivities and Nitrogen Metabolisms.

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Related Experiment Video

Updated: Jun 9, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

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Published on: February 14, 2017

A Synergistic Molecular Mechanism Defines Pyrogenic Dissolved Organic Matter (pyDOM) Coagulation.

Baoju He1, Yixuan Mao1, Longyi Ran1

  • 1College of Environment and Ecology, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

Environmental Science & Technology
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Wildfires increase pyrogenic dissolved organic matter (pyDOM) in water. A new study reveals pyDOM removal via unique molecular interactions during coagulation, unlike traditional methods, impacting water treatment and carbon export.

Keywords:
coagulationcondensed aromaticpyDOMwater purificationwildfire

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Area of Science:

  • Environmental Chemistry
  • Aquatic Chemistry
  • Organic Geochemistry

Background:

  • Climate change intensifies wildfires, increasing pyrogenic dissolved organic matter (pyDOM) in aquatic systems.
  • pyDOM's unique molecular structure influences its environmental fate, particularly during coagulation.
  • Coagulation is vital for carbon sedimentation and water purification, but pyDOM's role is poorly understood.

Purpose of the Study:

  • To investigate the distinct coagulation mechanisms of pyDOM compared to humic acid (HA).
  • To elucidate the molecular properties governing pyDOM removal and floc formation.
  • To understand the implications for carbon export and water treatment in fire-affected regions.

Main Methods:

  • Comparative study of pyDOM from burnt soils and standard humic acid (HA) using aluminum sulfate coagulation.
  • Analysis of molecular properties, including condensed aromatics and oxygenated aliphatics.
  • Characterization of resulting floc architectures and size distributions.

Main Results:

  • pyDOM removal occurs through synergistic π-π stacking and aluminum coordination, distinct from HA's charge neutralization.
  • This pyDOM-specific pathway forms larger, denser flocs with a wider size distribution.
  • Molecular-level aggregation involves aromatic core condensation and Al-O-C complex formation, enhancing floc integrity.

Conclusions:

  • A novel coagulation paradigm for pyDOM, differing from the traditional HA-centric model, has been identified.
  • This enhances understanding of pyDOM-driven particle assembly and carbon export dynamics.
  • Findings are crucial for predicting carbon stability and optimizing water treatment in wildfire-prone areas.