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相关概念视频

Fluid Mosaic Model01:19

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
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Steady, Laminar Flow Between Parallel Plates01:17

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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The Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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在接口主动内马特流体中的第一顺序对齐过渡.

Olga Bantysh1,2, Berta Martínez-Prat1,2, Jyothishraj Nambisan3

  • 1Department of Materials Science and Physical Chemistry, Universitat de Barcelona, 08028 Barcelona, Spain.

Physical review letters
|June 15, 2024
PubMed
概括
此摘要是机器生成的。

活体体质表现出不连续的相位过渡,与被动流体的连续过渡不同. 这项研究揭示了在活体阴性层中的对齐过渡过程中间歇性动态和共存区域.

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科学领域:

  • 软物质物理学 软物质物理学
  • 活动物质物理学 活动物质物理学
  • 液晶的动力学 液晶的动力学

背景情况:

  • 活跃的体是具有自行驱动组件的系统,表现出复杂的流动和定向模式.
  • 被动液晶经历了明确的相变,例如过渡到形-A相.
  • 了解主动和被动系统之间的相互作用对于新型材料设计至关重要.

研究的目的:

  • 实验性地研究2D主动阴性层与被动液晶相结合的动态相变.
  • 分析温度坡道和磁场在被动相位过渡期间对活性敌人的行为的影响.
  • 为了描述活体阴性系统中相变的顺序.

主要方法:

  • 实验设置涉及一个二维的活跃阴性层与被动液晶接口.
  • 应用温度坡道,以诱导被动液晶的相位过渡到 smectic-A 阶段.
  • 使用磁场来影响活跃磁体的方向和流动模式.

主要成果:

  • 活跃的阴性层从流转变为与磁场垂直对齐的准层状态.
  • 观察结果显示,顺序参数的动态间歇,与被动流体的连续过渡不同.
  • 观察到活跃的阴影中对齐和动荡区域的共存,表明了不连续的过渡.

结论:

  • 活跃的阴性对齐过渡本质上是不连续的 (第一顺序),无论对称性或动量减缓.
  • 与被动的smectic-A相位过渡的合影响了活跃的nematic的动态行为.
  • 这些发现提供了关于活性物质系统相变的基本性质的见解.