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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Viral nanomechanics with a virtual atomic force microscope.

María Aznar1, Sergi Roca-Bonet1, David Reguera1,2

  • 1Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.

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Summary
This summary is machine-generated.

This study introduces Virtual AFM (VAFM), a simulation tool to understand viral capsid mechanics. VAFM analyzes how factors like adsorption and tip radius influence viral shell behavior and breaking.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Materials Science

Background:

  • Viral capsids are essential protein shells protecting viral genetic material.
  • Their mechanical properties are crucial for viral function and emerging nanotechnological applications.
  • Interpreting single-virus nanoindentation experiments requires robust theoretical and simulation support.

Purpose of the Study:

  • To develop and utilize a coarse-grained Brownian Dynamics simulation, Virtual AFM (VAFM), for analyzing viral capsid mechanics.
  • To investigate the influence of various parameters on viral mechanical response and breaking.
  • To provide insights not obtainable through experimental methods alone.

Main Methods:

  • Development of a coarse-grained Brownian Dynamics simulation model (VAFM).
  • Mimicking atomic force microscopy (AFM) nanoindentation experimental setups.
  • Systematic analysis of parameters affecting capsid mechanics, including adsorption, tip radius, shell rigidity, and shape.

Main Results:

  • VAFM provides valuable mechanical insights into viral capsids beyond experimental limitations.
  • The simulation framework allows for the study of how different parameters influence capsid response and failure.
  • Demonstrates the utility of coarse-grained simulations in understanding complex biological structures.

Conclusions:

  • Virtual AFM is a powerful tool for dissecting viral capsid mechanics and predicting their behavior under stress.
  • Understanding these mechanical properties is key for advancing bio- and nano-technological applications using viral-derived structures.
  • Simulation-based analysis complements experimental data, offering a deeper understanding of viral structural integrity.