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Videos de Conceptos Relacionados

Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
Planar Rigid-Body Motion01:22

Planar Rigid-Body Motion

Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
Planar motion is typically divided into three distinct categories. The first is rectilinear translation, demonstrated by a subway train that moves along...
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin networks...
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Actin Treadmilling01:18

Actin Treadmilling

Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

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Updated: May 17, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Movimiento espontáneo en materia activa organizada jerárquicamente.

Tim Sanchez1, Daniel T N Chen, Stephen J DeCamp

  • 1Martin Fisher School of Physics, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, USA.

Nature
|November 9, 2012
PubMed
Resumen

Los investigadores crearon materiales biomiméticos activos a partir de haces de microtúbulos. Estos materiales activos de autoensamblaje exhiben motilidad autónoma y una dinámica de fluidos única, a diferencia de los materiales pasivos.

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia blanda Física de la materia blanda

Sus antecedentes:

  • Las células usan motores moleculares para tareas mecánicas, inspirando materiales activos biomiméticos.
  • Los materiales activos, a diferencia de los sistemas de equilibrio, pueden exhibir movimiento autónomo y autoorganización.

Objetivo del estudio:

  • Para ensamblar jerárquicamente análogos lejos del equilibrio de los materiales convencionales utilizando haces de microtúbulos.
  • Investigar las propiedades colectivas y los comportamientos emergentes de estos materiales activos.

Principales métodos:

  • Ensamblaje jerárquico de haces de microtúbulos extensibles.
  • Formación de redes activas de percolación y cristales líquidos nemáticos activos dentro de las gotas de emulsión.

Principales resultados:

  • Las redes activas de microtúbulos exhiben flujos caóticos impulsados internamente, inestabilidades y transporte mejorado.
  • Las emulsiones activas muestran motilidad autónoma, adsorción superficial y flujos controlados a través de fracturas y dinámicas de defectos.

Conclusiones:

  • Los conjuntos de objetos microscópicos activos muestran distintas propiedades biomiméticas colectivas en comparación con los materiales inanimados.
  • Se necesita el desarrollo de un marco teórico para la ingeniería de propiedades de los materiales que están lejos del equilibrio.