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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...

Mass Spectrometry: Molecular Fragmentation Overview

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...

Habitat Fragmentation

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Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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...

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...

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

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Updated: Jan 21, 2026

Generation of Dynamical Environmental Conditions using a High-Throughput Microfluidic Device

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Published on: April 17, 2021

効果的なフラグメントベースのデュアル条件付き拡散フレームワークによる分子生成

Haotian Chen^1,2,3, Yiting Shen⁴, Jichun Li⁵

¹Hubei Provincial Key Laboratory of Artificial Intelligence and Smart Learning, Central China Normal University, Wuhan, Hubei 430079, PR China.

Briefings in bioinformatics

|January 19, 2026

まとめ

この要約は機械生成です。

フラグメントベースのデュアル条件付き拡散（FDC-Diff）は、構造ベースの創薬において有効な分子を生成することで進歩します。この新しいフレームワークは、化学的妥当性と3D構造精度を向上させるために、分子骨格とR基を区別します。

キーワード:

条件付き拡散モデルフラグメントベースの分子生成構造ベースの創薬

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Last Updated: Jan 21, 2026

Generation of Dynamical Environmental Conditions using a High-Throughput Microfluidic Device

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Published on: April 17, 2021

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科学分野:

計算化学
創薬
分子モデリング

背景:

フラグメントベースの分子生成は、構造ベースの創薬（SBDD）において重要です。
既存の方法では、3D構造上の制約と化学的妥当性のバランスをとることが困難です。
この制限は、分子骨格とR基を区別せずに扱うことに起因します。

研究の目的:

フラグメントベースの分子生成のための新しいデュアル条件付き拡散フレームワーク、FDC-Diffを導入します。
化学的プライオリティと構造的手がかりを統合して、分子生成を強化します。
化学的に有効で、合成可能で、薬理学的に関連性のある分子の生成を改善します。

主な方法:

FDC-Diffは、分子生成を骨格構築とR基詳細化の2つのステージに分解します。
最初のステージは、グローバルなトポロジーのために空間的に制約された骨格を構築します。
2番目のステージは、キュレーションされた反応ルールと物理化学に着想を得た詳細化ステップを使用して、局所的な意味と特性の洗練のためにR基を追加します。

主要な成果:

FDC-DiffはSBDDベンチマークで最先端のパフォーマンスを達成します。
モデルは化学的に有効で空間的に適合する分子を正常に生成します。
FDC-Diffは既存の方法と比較して優れた薬理学的関連性を示します。

結論:

FDC-Diffは、SBDDのためのフラグメントベースの分子生成において重要な進歩を提供します。
骨格とR基の異なる役割を処理するフレームワークの能力は、分子設計を強化します。
FDC-Diffは、創薬を加速するための実用的なツールとしての可能性を示しています。