関連する実験動画
Updated: Jul 12, 2026

08:01
The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
顆粒内拡散:クラスティック水層における溶液輸送に影響を与える重要なメカニズム?
まとめ
水層砂の内粒子の多孔性は,以前に測定されたよりも大きく,より多くの反応部位を明らかにしています. この発見は,放射性および有毒廃棄物のシミュレーションのための輸送モデルに拡散表現を含むことを必要としています.
科学分野:
- 地質学 地質学 地質学
- 環境科学 環境科学
- 水文地質学 水文地質学は,水文地質学である.
背景:
- 標準的な実験室試験では,水層の砂の微小孔隙性を過小評価しています.
- 水層の性質は,溶質の輸送と汚染物質の運命を著しく影響する.
研究 の 目的:
- 砂の大きさの地下水層物質の微小孔隙を正確に定量化するために.
- この多孔性の溶解物輸送と反応動力学への影響を評価する.
主な方法:
- スキャニング電子顕微鏡 (SEM)
- 水銀注入ポロシメトリー
- エピフローレンス顕微鏡
- 実験室とフィールドのトレーサーテスト
主要な成果:
- 粒体内の多孔性と反応部位は,標準的な方法によって示されるよりも大幅に大きい.
- トレーサー検査では,粒子の内部への拡散と交換と一致する溶液不均衡が明らかになりました.
- 観察された現象は,多孔性介質における溶液輸送の理解を改訂する必要があります.
結論:
- 標準的な測定技術は,貯水層の砂の多孔性と反応部位の全範囲を捉えることができない.
- 穀物の内部への拡散は,特に反応性汚染物質の溶液輸送に影響を与える重要なプロセスです.
- 輸送モデルは,汚染物質の移動,特に放射性および有毒な廃棄物の正確なシミュレーションのために,更新された拡散表現を必要とします.
さらに関連する動画
07:57An Experimental and Finite Element Protocol to Investigate the Transport of Neutral and Charged Solutes across Articular Cartilage
Published on: April 23, 2017
12:03Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
Published on: September 1, 2020
関連する概念動画
Transcellular Transport of Solutes
Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
Facilitated Transport
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 membrane via...
Facilitated Transport
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 membrane via...
Drug Absorption Mechanism: Passive Membrane Transport
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 weak...
Formation of Concentrated Urine
There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
Facilitated Diffusion
The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...