関連する実験動画
Updated: Jun 24, 2026
12:49
Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
Published on: April 8, 2011
まとめ
研究者らは,流動の速度が線形に変化する薄い海洋亜層を特定した. この発見は,海洋のストレスと乱流を正確に推定するのに役立ちます.
科学分野:
- 海洋学 海洋学 海洋学
- 流体力学 流体力学とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 床付近の流れを理解することは,堆積物輸送と沿岸のプロセスにとって極めて重要です.
- 以前の研究では,水と沈殿物の直接的な接点における高解像度のデータが欠けていました.
研究 の 目的:
- 海底付近の水平流れプロフィールの詳細な構造を調査する.
- 水-沈殿体界面における新たに特定された亜層の特性を定量化するために.
主な方法:
- 加熱されたサーミストールを用いて温度を測定し,電流の速度を推論した.
- オレゴン大陸棚の200メートルの水深で測定を行った.
- 分析した水平フロープロフィールは,インターフェースの19cm上から2cm下までです.
主要な成果:
- 線形電流の速度変動を示す0.6cm厚さの明確な亜層が特定されました.
- 亜層データから得られた粘着性および乱流性ストレスの推定値は,密接な一致を示した (5%以内).
- 計算されたストレスの値は,信頼限界の電流メーターのスペクトルデータと良好に相関していた.
結論:
- 特定された亜層は,海床近くの海洋動態を研究するための貴重な領域を提供します.
- この亜層内の高解像度測定を使用して,正確なストレスの見積もりを達成できます.
- この研究は,海底の流体力学に関する我々の理解を洗練している.
関連する概念動画
01:14Adhesion
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
01:07Cohesion
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
On a surface,...
02:57Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
01:03Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
01:24Adherens Junctions
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...
Adherens Junctions are Dynamic
The endothelial cells...
01:23Surface Appendages of Archaea
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...