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Related Concept Videos

Diffusion01:12

Diffusion

183.4K
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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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

317
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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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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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

42
Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
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Drug Absorption Mechanism: Passive Membrane Transport01:23

Drug Absorption Mechanism: Passive Membrane Transport

3.3K
Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
3.3K
Drug Absorption Mechanism: Carrier-Mediated Membrane Transport01:19

Drug Absorption Mechanism: Carrier-Mediated Membrane Transport

3.2K
Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
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Related Experiment Video

Updated: May 7, 2025

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
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A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

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Text-guided small molecule generation via diffusion model.

Yanchen Luo1, Junfeng Fang1, Sihang Li1

  • 1University of Science and Technology of China, Hefei, Anhui, China.

Iscience
|January 6, 2025
PubMed
Summary
This summary is machine-generated.

TextSMOG is a novel text-guided small molecule generation approach using diffusion models. It enables the creation of diverse and stable molecules based on detailed human language descriptions, advancing drug discovery.

Keywords:
Artificial intelligenceChemistryMolecular modelling

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Area of Science:

  • Computational Chemistry
  • Drug Discovery
  • Bioinformatics

Background:

  • De novo molecule generation is vital for drug discovery and chemical biology.
  • Existing generative models struggle with complex, language-based property customization.

Purpose of the Study:

  • To introduce TextSMOG, a text-guided diffusion model for small molecule generation.
  • To overcome limitations of single-property value conditioning in generative models.

Main Methods:

  • Integration of language and diffusion models.
  • Utilizing textual descriptions as conditions for molecule generation.
  • Focus on generating 3D molecular structures.

Main Results:

  • TextSMOG effectively captures and uses information from textual descriptions.
  • Enhanced stability and diversity in generated molecules.
  • Successful generation of molecules based on complex textual customizations.

Conclusions:

  • TextSMOG represents a powerful advancement in text-guided molecule generation.
  • The approach facilitates sophisticated molecular design informed by natural language.
  • Potential to accelerate the identification of novel drug candidates.