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Videos de Conceptos Relacionados

Unsymmetric Bending01:18

Unsymmetric Bending

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within the...
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Degree of Curvature and Radius of Curvature01:19

Degree of Curvature and Radius of Curvature

The degree of curvature and the radius of curvature are fundamental concepts in determining the sharpness or smoothness of a curve. The degree of curvature is a measure of how steeply a curve bends and can be determined using the chord basis or the arc basis. In the chord basis method, the degree of curvature is defined as the central angle subtended by a chord of 30.48 meters, helping in the calculation of the radius of the curve. The arc basis method defines the degree of curvature as the...

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Video Experimental Relacionado

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Designing a Bio-responsive Robot from DNA Origami
13:32

Designing a Bio-responsive Robot from DNA Origami

Published on: July 8, 2013

Origami de ADN con curvaturas complejas en el espacio tridimensional.

Dongran Han1, Suchetan Pal, Jeanette Nangreave

  • 1The Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA. dongran.han@asu.edu

Science (New York, N.Y.)
|April 16, 2011
PubMed
Resumen

Los investigadores desarrollaron un método para crear nanoestructuras de ADN complejas y curvas utilizando el origami del ADN. Esta técnica permite un control preciso sobre las formas 3D, lo que permite nuevos diseños a nanoescala.

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Área de la Ciencia:

  • Nanotecnología La nanotecnología es la nanotecnología.
  • Biotecnología La biotecnología es la biotecnología.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • El origami de ADN es una técnica poderosa para crear estructuras a nanoescala.
  • Diseñar formas 3D complejas con origami de ADN sigue siendo un desafío.

Objetivo del estudio:

  • Presentar una estrategia para diseñar y construir nanoestructuras de ADN autoensambladoras con intrincadas superficies curvas en el espacio 3D.
  • Para demostrar la capacidad de crear nanoestructuras de ADN de alta curvatura.

Principales métodos:

  • Utilizando la técnica de plegado de origami de ADN para doblar el ADN de doble hélice a lo largo de los contornos del objeto objetivo.
  • Empleando anillos concéntricos de ADN para el control de curvatura en el plano.
  • Introducción de la curvatura fuera de plano mediante el ajuste de las posiciones de cruce y los patrones entre las doble hélices de ADN.

Principales resultados:

  • Diseñó y ensambló con éxito nanoestructuras de ADN con alta curvatura.
  • Demostró la creación de anillos concéntricos 2D y estructuras 3D como conchas esféricas, conchas ellipsoidales y un nanovaso.
  • Mostró un control preciso sobre la curvatura tanto en el plano como fuera del plano.

Conclusiones:

  • La estrategia presentada permite el diseño preciso y la construcción de nanoestructuras complejas y curvas de ADN.
  • Este método amplía las posibilidades de crear objetos 3D sofisticados a nanoescala utilizando origami de ADN.
  • Las nanoestructuras ensambladas, incluido un nanoflask, destacan la versatilidad de la técnica y las aplicaciones potenciales.