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関連する概念動画

Diffusion01:12

Diffusion

176.8K
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...
176.8K
Facilitated Transport01:19

Facilitated Transport

129.9K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
129.9K
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.8K
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...
4.8K
Facilitated Transport01:19

Facilitated Transport

14.7K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
14.7K
Dialysis01:15

Dialysis

2.2K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
2.2K
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

881
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
881

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関連する実験動画

Updated: May 7, 2026

Planar Gradient Diffusion System to Investigate Chemotaxis in a 3D Collagen Matrix
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Planar Gradient Diffusion System to Investigate Chemotaxis in a 3D Collagen Matrix

Published on: June 12, 2015

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ガイデッド拡散による切削問題の解決方法.

Xin Tang, Keke Liu, Jie Chen

    Optics express
    |February 20, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    擬逆誘導拡散モデル (Pseudo-inverse-guided diffusion models,ΠGDM) は,横断シアリングインターフェロメトリ (LSI) から波長の再構築のための新しい解決策を提供します. この方法は,単一のシーアログラムから高精度メトロロジーを達成し,従来の技術よりも精度と騒音の強さで優れています.

    さらに関連する動画

    Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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    Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

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    The Diffusion of Passive Tracers in Laminar Shear Flow
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    Planar Gradient Diffusion System to Investigate Chemotaxis in a 3D Collagen Matrix
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    Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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    The Diffusion of Passive Tracers in Laminar Shear Flow
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    The Diffusion of Passive Tracers in Laminar Shear Flow

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    科学分野:

    • オプティカル・メトロロジー
    • コンピューティング・イマージング (Computational Imaging) とは
    • 波の先端を感知する.

    背景:

    • 横断切断干渉計 (LSI) による波面再構築は,誤った逆の問題である.
    • 既存の方法は,多くの場合,複数の測定を必要とし,または潜在的に偏った仮定に依存しています.
    • 騒音感度と情報損失は,LSIにおける重要な課題です.

    研究 の 目的:

    • 波長の再構築のための新しい枠組み,擬似逆方向誘導拡散モデル (Pseudo-inverse-guided diffusion models, PGDM) を導入する.
    • 改善された再構築のためのデータ主導の事前として,事前訓練された拡散モデルを活用する.
    • 単一のシーアログラムから高精度復元を可能にすることで,従来のLSI技術の限界に対処する.

    主な方法:

    • 拡散モデルフレームワーク内のベクター・ヤコビアン製品ガイドラインを使用してLSI物理学の統合.
    • 前もって訓練された無条件の拡散モデルを,強固な前提として利用する.
    • 古典的なゾーン統合,フーリエ,ティホノフの正規化,および監督されたディープラーニングの方法に対するベンチマーク.

    主要な成果:

    • ΠGDMは,シミュレーションと実験的検証の両方において,ベンチマーク方法と比較して,優れた信頼性と騒音の強度を示しています.
    • このフレームワークは,測定の一貫性を確保しながら,欠けている空間周波数を成功裏に回復します.
    • シングルシーアログラムから高精度メトロロジーを達成し,従来のアプローチに比べて大幅に改善しました.

    結論:

    • ΠGDMは,LSIにおける波線の再構築のための新しい効果的なアプローチを提示しています.
    • それは,監督学習方法に対する汎用的でゼロショットな代替案を提供し,タスク固有のトレーニングの必要性を排除します.
    • この方法は,メトロロジーの精度と信頼性を高め,LSIにおける主要な課題を克服します.