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Symmetric Member in Bending01:07

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In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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iMODS: internal coordinates normal mode analysis server.

José Ramón López-Blanco1, José I Aliaga2, Enrique S Quintana-Ortí2

  • 1Department of Biological Chemical Physics, Rocasolano Physical Chemistry Institute C.S.I.C., Serrano 119, 28006 Madrid, Spain.

Nucleic Acids Research
|April 29, 2014
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Summary

Normal mode analysis (NMA) in internal coordinates efficiently explores macromolecular motions. The iMODS server generates transition pathways and animations, aiding conformational change studies for all user levels.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Normal mode analysis (NMA) is crucial for understanding biological macromolecule dynamics.
  • Exploring collective functional motions and conformational changes is essential in structural biology.
  • Existing NMA methods can be computationally intensive and limited in scope.

Purpose of the Study:

  • To present iMODS, a versatile web server for exploring normal modes and generating transition pathways.
  • To enhance the efficiency and applicability of NMA using an internal coordinate formulation.
  • To provide advanced visualization tools for macromolecular dynamics and conformational changes.

Main Methods:

  • Utilizing normal mode analysis (NMA) in internal (dihedral) coordinates for enhanced efficiency.
  • Developing a web server (iMODS) for interactive exploration of NMA modes and transition pathways.
  • Implementing coarse-grained atomic representations and elastic network potentials for customizable model resolution.

Main Results:

  • iMODS successfully reproduces collective functional motions of biological macromolecules.
  • Feasible transition pathways between homologous structures are generated, even for large macromolecules.
  • Interactive vibrational analysis, motion animations, and morphing trajectories are readily achievable.
  • Advanced visualization, including affine-model-based domain dynamics representation, is supported.

Conclusions:

  • The iMODS server offers an efficient and versatile platform for NMA, facilitating the study of macromolecular conformational changes.
  • Its internal coordinate formulation improves NMA efficiency and broadens its applicability.
  • iMODS empowers both non-specialists and advanced users in analyzing and visualizing molecular dynamics.