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Related Concept Videos

Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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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...
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Diffusion01:12

Diffusion

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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...
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Diffusion01:21

Diffusion

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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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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
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The Two-State Receptor Model01:29

The Two-State Receptor Model

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
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Related Experiment Video

Updated: Apr 19, 2026

Imaging G-protein Coupled Receptor GPCR-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum
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Imaging G-protein Coupled Receptor GPCR-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum

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How receptor diffusion influences gradient sensing.

H Nguyen, P Dayan, G J Goodhill

    Journal of the Royal Society, Interface
    |January 1, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Cellular spatial sensing accuracy is limited by receptor diffusion. Increased receptor movement, or diffusion, reduces the information cells can gather from chemical gradients, impacting directed cell motion.

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    High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy
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    Imaging G-protein Coupled Receptor GPCR-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum
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    High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy
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    High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy

    Published on: July 25, 2014

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Biochemistry

    Background:

    • Chemotaxis, or directed cell movement along chemical gradients, is vital for biological processes.
    • Eukaryotic cells sense gradients by comparing receptor binding across their membranes.
    • Existing models often simplify by assuming immobile receptors, neglecting real-world diffusion.

    Purpose of the Study:

    • To investigate the physical limits on spatial sensing accuracy imposed by receptor diffusion.
    • To explore how receptor mobility affects the cell's ability to detect chemical gradients.

    Main Methods:

    • Developed a theoretical model incorporating freely diffusing receptors on the cell membrane.
    • Analyzed the impact of varying diffusion constants on spatial sensing capabilities.

    Main Results:

    • Found that receptor diffusion significantly impacts spatial sensing accuracy.
    • Demonstrated a monotonic decrease in Fisher information with increasing receptor diffusion constant.
    • Showed that receptor mobility introduces a physical limitation to gradient detection.

    Conclusions:

    • Receptor diffusion is a critical factor limiting the precision of cellular spatial sensing.
    • The mobility of chemosensory receptors directly reduces the information available for directed cell motion.
    • Future models should account for receptor dynamics to accurately represent cellular gradient sensing.