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関連する概念動画

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.3K
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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Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

616
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
616
Column Efficiency: Rate Theory01:12

Column Efficiency: Rate Theory

285
The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
285
Subcellular Fractionation01:32

Subcellular Fractionation

6.9K
The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...
6.9K
Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

492
In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
492
Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

1.1K
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
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関連する実験動画

Updated: Jun 14, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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空間的に異質な拡散による分割:実験と二要素ランダムウォークモデル

Hoyoun Kim1,2, KeunMin Ken Lee3, Gadisa Firisa3

  • 1Department of Mathematical Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

Journal of the American Chemical Society
|August 30, 2024
PubMed
まとめ

粒子の拡散だけで異質な環境における分割現象を説明できる. 私たちの研究は 2つの構成要素の拡散モデルが これらの動態を正確に捉え 誘導の必要性を否定していることを確認しています

さらに関連する動画

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
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Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy

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関連する実験動画

Last Updated: Jun 14, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
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科学分野:

  • 物理化学
  • コロイドと表面化学
  • 統計的メカニズム

背景:

  • 分割は混合物を分離する重要なプロセスです.
  • 粒子分解の背後にある原動力を理解することは,科学や産業の様々な用途に不可欠です.
  • インタフェースの間の粒子の分割における拡散とアドベクションの役割は依然として議論されている.

研究 の 目的:

  • 拡散のみか,拡散とアドベクションの組み合わせが粒子の分断を駆動するかどうかを調査する.
  • 固体対固体界面での粒子の分断を制御する物理的メカニズムを実験的に決定する.

主な方法:

  • 染料の分断パターンを 実験的に観察する
  • ポリアクリラミドゲルの密度が異なる固体-固体インターフェースを介して微粒子を拡散します.
  • 2つの構成要素の拡散モデルを使用して実験データを分析し,単一の構成要素のモデル (Fick, Wereide, Chapman) と比較する.

主要な成果:

  • 2つのコンポーネントの拡散モデルは,観察された分断のダイナミクスを正確に捉えました.
  • シングルコンポーネントの拡散モデルは実験結果を複製できませんでした.
  • 結果は,観察された分断現象を説明するために,拡散だけでは十分であることを示しています.

結論:

  • 研究された異質な環境における粒子の分化に起因する主なメカニズムは,アドベクションではなく,拡散である.
  • 2つのコンポーネントのランダムウォークモデルは 分割の基礎物理を効果的に記述します
  • この発見は粒子輸送と分離過程の理解を簡素化します.