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Related Concept Videos

Diffusion01:12

Diffusion

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...
Diffusion01:21

Diffusion

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...
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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 principle...
Facilitated Diffusion01:16

Facilitated Diffusion

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...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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...
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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 their diffusion into...

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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
17:06

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

Text-Driven Relation Manipulation of Diffusion Imagery.

Yiming Li, Peng Zhou, Hongwei Hu

    IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
    |June 12, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces relation manipulation for text-guided image editing, enabling changes to object quantities and interactions. The novel approach enhances structural image alterations beyond simple appearance modifications.

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    Area of Science:

    • Computer Vision
    • Artificial Intelligence
    • Image Processing

    Background:

    • Text-guided image manipulation is a growing field, but current methods primarily edit existing object attributes.
    • Existing techniques struggle with fundamental structural changes and editing interactions between multiple objects.

    Purpose of the Study:

    • Introduce a novel text-guided manipulation task called "relation manipulation" for altering image structure.
    • Enable editing of object quantities and interactions among diverse instances within an image.

    Main Methods:

    • Relation customization: Fine-tuning relationships with a compact dataset for nuanced interaction understanding.
    • Multi-region guided diffusion: Employing gradient optimization and attention control for conflict-free multi-region editing.

    Main Results:

    • Demonstrated capability in modifying object quantities and inter-instance relationships.
    • Successful application in multi-region inversion for real-world image relation manipulation and consecutive image editing.

    Conclusions:

    • The proposed relation manipulation approach offers advanced control over image structure and object interactions.
    • The method is compatible with Stable Diffusion models and integrates with Stable Diffusion WebUI for high-quality, controllable image generation.