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相关概念视频

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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Mechanism of Filopodia Formation01:39

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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Actin Filament Depolymerization01:19

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
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螺旋纤维的负载依赖电阻力理论.

Pyae Hein Htet1, Eric Lauga1

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
|September 11, 2025
PubMed
概括
此摘要是机器生成的。

螺旋式微游泳器的最佳阻力系数取决于负载,这与之前的假设相反. 这一发现影响了细菌模型和以低雷诺兹数导航的人工游泳者.

关键词:
旗的小部分是flagellum螺旋 (helix) 是一个螺旋.微型游泳者 微型游泳者电阻力理论 - 电阻力理论

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科学领域:

  • 流体动力学 流体动力学
  • 生物物理学的生物物理.
  • 微观规模的运输方式

背景情况:

  • 鞭状细菌和人造微游泳器使用螺旋丝旋转以在低雷诺兹数下进行推进.
  • 1976年,Lighthill的工作确立了"最佳"阻力系数,用于没有负载的无力螺旋游泳.
  • 这些系数被广泛使用,但在不同的条件下可能不准确.

研究的目的:

  • 为了研究附着负载对旋转螺旋丝的阻力系数的影响.
  • 在负载存在时重新评估Lighthill系数的适用性.
  • 为负载依赖电阻提供物理解释.

主要方法:

  • 重新审视带有附加负载的旋转螺旋丝的电阻力理论.
  • 根据负载大小,量化计算系数与Lighthill值的偏差.
  • 开发一个物理模型来解释观察到的负载依赖性.

主要成果:

  • "最佳"阻力系数取决于附加负载的大小.
  • 随着负载大小的增加,Lighthill的系数变得越来越不准确.
  • 确定了阻力系数的负载依赖性的物理解释.

结论:

  • 挑战了以前关于螺旋游泳器负载独立阻力系数的假设.
  • 精确的微游泳推进模型需要考虑负载大小.
  • 这项研究完善了我们对微观流体动力学的理解.