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Videos de Conceptos Relacionados

Cell Migration01:09

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
Cell Migration01:19

Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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...
Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
Types of Membrane Protrusions01:28

Types of Membrane Protrusions

The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
The microvilli, an example of stable protrusions, are finger-like projections with a...

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Video Experimental Relacionado

Updated: Jul 21, 2026

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
07:40

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

La autoorganización de la superficie causada por las redes de dislocación.

Konrad Thürmer1, Robert Q Hwang, Norman C Bartelt

  • 1Sandia National Laboratories, Livermore, CA 94550, USA. kthurme@sandia.gov

Science (New York, N.Y.)
|March 4, 2006
PubMed
Resumen

Los investigadores descubrieron un nuevo mecanismo de autoorganización para el ordenamiento de superficies robustas. La estabilidad de las matrices de agujeros en superficies de plata-rutenio depende de las estructuras de dislocación inadaptadas, observadas a través de la microscopía de túnel de barrido.

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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Ciencias de la superficie Ciencias de la superficie.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El ordenamiento de la superficie es crucial para los materiales avanzados.
  • Comprender los mecanismos de autoorganización es clave para controlar las estructuras superficiales.
  • Las dislocaciones de desajuste pueden influir en las propiedades de la película.

Objetivo del estudio:

  • Investigar un nuevo mecanismo de autoorganización que conduce a un ordenamiento superficial robusto.
  • Para analizar cuantitativamente el movimiento térmico de los agujeros en una monocapa de plata sobre una superficie de rutenio.
  • Para determinar los factores que controlan la estabilidad de las matrices de agujeros ordenados.

Principales métodos:

  • Observación en tiempo real utilizando microscopía de túnel de barrido (STM).
  • Análisis cuantitativo del movimiento térmico de los defectos (agujeros).
  • Investigación de las monocapas de plata en las superficies de rutenio (Ru).

Principales resultados:

  • Se identificó un nuevo mecanismo para el ordenamiento de superficies robustas.
  • Se descubrió que la disposición y la estructura de las dislocaciones de desajuste determinan la estabilidad de las matrices de agujeros.
  • Se analizó cuantitativamente el movimiento térmico de los agujeros creados por átomos de azufre.

Conclusiones:

  • El estudio revela una nueva vía para lograr estructuras superficiales estables.
  • Las dislocaciones de desajuste juegan un papel crítico en la autoorganización de los defectos superficiales.
  • La microscopía de túnel de barrido proporciona valiosos conocimientos sobre la dinámica de la superficie a nanoescala.