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関連する概念動画

Buoyancy00:59

Buoyancy

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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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Subatomic Particles03:37

Subatomic Particles

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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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Surface Appendages of Archaea01:23

Surface Appendages of Archaea

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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...
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Tidal Forces01:06

Tidal Forces

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The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
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Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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関連する実験動画

Updated: Jun 10, 2025

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

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海の下の小さな彗星

B B Cael1, Lionel Guidi2,3

  • 1National Oceanography Centre, Southampton, UK.

Science (New York, N.Y.)
|October 10, 2024
PubMed
まとめ

有機物質から成る海雪は 粘液によって沈むのが遅い. この粘液の引き寄せは 海の生地化学的サイクルに 大きく影響します

科学分野:

  • 海洋学
  • 生地化学
  • 海洋生物学

背景:

  • 海の雪は 炭素排出の重要な経路です
  • 集積率や沈没率などの海洋雪の物理的性質は,その運命と生態学的影響に影響します.
  • 粘液は沈む粒子の性質を変えることができる.

研究 の 目的:

  • 海の雪の沈む速度に 粘液の影響を調べるため
  • 変化した海雪のダイナミクスの潜在的な生地化学的影響を評価する.

主な方法:

  • 海洋雪の集積と沈没をシミュレートする実験室での実験
  • 異なる粘液濃度下で沈む速度を測定する.
  • 粒子の流れと炭素の輸出のモデル化

主要な成果:

  • 海の積雪は粘液で覆われると沈む速度が著しく低下します.
  • 速度減少の程度は粘液含有量に比例する.
  • この阻力効果は,粒子が水柱に留まる時間を増加させる可能性があります.

結論:

  • 海洋生物による粘液生成は,海雪の沈没を大幅に遅らせる.

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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

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Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction
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Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction

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  • この"粘液引きずり"は,海洋の炭素循環と栄養素輸送に重大な影響を及ぼします.
  • この効果を様々な海洋環境で定量化するにはさらなる研究が必要である.