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Related Concept Videos

Diffusion01:12

Diffusion

210.1K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
210.1K
Diffusion01:21

Diffusion

5.7K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
780
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

952
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
952
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

5.0K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
5.0K
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

1.2K
Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Related Experiment Video

Updated: Oct 25, 2025

Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems
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Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems

Published on: June 13, 2025

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Diffusion enables integration of heterogeneous data and user-driven learning in a desktop knowledge-base.

Tomasz Konopka1, Sandra Ng1, Damian Smedley1

  • 1William Harvey Research Institute, Queen Mary University of London, London, United Kingdom.

Plos Computational Biology
|August 11, 2021
PubMed
Summary

This study introduces a text-based knowledge base for integrating diverse bioinformatic data, enabling tailored analyses and novel discoveries. A diffusion-based mathematical transformation enhances data exploration and user-driven learning for improved data management.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Data Science

Background:

  • Integrating diverse bioinformatic datasets (experimental, unstructured) is crucial for tailored analyses and new insights.
  • Developing custom analysis pipelines is time-consuming; general tools for heterogeneous data are lacking.

Purpose of the Study:

  • To present a unified, text-based knowledge base for accommodating various bioinformatic data types and applications.
  • To demonstrate the utility of nearest-neighbor algorithms and diffusion-based transformations for data exploration and integration.

Main Methods:

  • A knowledge base integrating heterogeneous data treated as text.
  • Nearest-neighbor algorithms for common and specific bioinformatic tasks (e.g., gene-set analysis, ontology translation).
  • A diffusion-motivated mathematical transformation for cross-dataset exploration and imputation.

Main Results:

  • The knowledge base successfully performs gene-set analysis and ontology translation.
  • Diffusion enables mapping multi-modal queries (gene symbols, phenotypes) to disease descriptions.
  • User-driven learning allows real-time improvement of search results by adding domain knowledge.

Conclusions:

  • A text-based knowledge base with diffusion effectively integrates heterogeneous bioinformatic data.
  • This approach facilitates tailored analyses, discovery of hidden patterns, and user-guided data curation.
  • User-driven learning enhances data management, integration, and curation processes.