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Related Concept Videos

Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
For...
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Drug Distribution: Overview01:11

Drug Distribution: Overview

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Drug distribution within the body is a dynamic process involving the movement of a drug in two directions across various compartments: from the bloodstream into tissues (tissue uptake) and from tissues back into the bloodstream (tissue release or redistribution). This process is passive and primarily driven by two variables: the concentration gradient between the bloodstream and the extravascular tissues and the drug's ability to cross the cell membrane.
Initially, the free drug in the...
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Factors Affecting Drug Distribution: Tissue Permeability01:30

Factors Affecting Drug Distribution: Tissue Permeability

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The drug distribution process within the human body is a complex interplay of various physicochemical properties inherent to the drugs. These properties, including molecular size, ionization degree, partition coefficient, and stereochemical nature, significantly impact how drugs permeate biological membranes to reach their target tissues.
Small molecules with a molecular weight below 500 to 600 Daltons can easily pass through the capillary membrane, gaining access to different tissues. Larger...
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Factors Affecting Drug Distribution: Miscellaneous Factors01:19

Factors Affecting Drug Distribution: Miscellaneous Factors

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Drug distribution in the human body is a complex process influenced by various individual factors, including age, pregnancy, obesity, diet, body water composition, pH levels, and specific disease conditions.
Age plays a significant role due to differences in body composition among different age groups. Infants, for instance, have a higher proportion of total body water and lower albumin levels, a protein that binds drugs in the bloodstream. This unique composition in infants enhances the...
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Tissue-Drug Binding: Localization of Drugs and its Significance01:24

Tissue-Drug Binding: Localization of Drugs and its Significance

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Body tissues, comprising approximately 40% of the body weight, are crucial in drug distribution and localization. These tissues can serve as drug storage sites, competing with plasma binding sites for drug molecules.
Drugs can bind to different tissue components, enhancing their distribution and localization. The factors influencing drug localization in tissues include the drug's lipophilicity, structural characteristics, tissue perfusion rate, and pH differences. These factors determine...
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Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution

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Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
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Related Experiment Video

Updated: May 6, 2026

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
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Topography influences megadune distribution and morphology.

Hui Zhao1, Keqi Wang1,2, Yongwei Sheng3

  • 1Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.

Proceedings of the National Academy of Sciences of the United States of America
|March 3, 2026
PubMed
Summary

Topography, not just sand supply, dictates giant dune size. Mountains and depressions create wind shifts that accelerate the growth of massive dunes (megadunes) on Earth and other planets.

Keywords:
aspect ratioheterogeneitymegadunesshear stresstopographic obstacle

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Area of Science:

  • Geomorphology
  • Planetary Science
  • Aeolian Processes

Background:

  • Dune formation and maximum size are not fully understood.
  • Previous theories focused on atmospheric and sediment constraints.

Purpose of the Study:

  • Investigate the role of topography in megadune formation.
  • Identify controls on maximum dune size.

Main Methods:

  • Global mapping of Earth's megadunes.
  • Dune simulation modeling under varied topographic conditions.

Main Results:

  • Megadunes are found near mountains and in depressions.
  • Topography creates shear stress gradients, accelerating sand accumulation and dune growth.
  • Surrounding topography modifies wind regimes, increasing dune aspect ratios.

Conclusions:

  • Terrain-induced wind heterogeneity is key to megadune formation.
  • This mechanism applies to both Earth and extraterrestrial bodies.
  • Topography fundamentally controls massive aeolian landform evolution.