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Related Concept Videos

What is an Experiment?01:12

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An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
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Related Experiment Video

Updated: Feb 3, 2026

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid
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AFM Nanoindentation Experiments on Protein Shells: A Protocol.

Yukun Guo1, Wouter H Roos2

  • 1Moleculaire Biofysica, Zernike Instituut, Rijksuniversiteit Groningen, Groningen, The Netherlands.

Methods in Molecular Biology (Clifton, N.J.)
|October 31, 2018
PubMed
Summary
This summary is machine-generated.

This study details atomic force microscopy (AFM) methods for measuring the mechanical properties of protein nanoshells. These techniques provide insights into the structural integrity and failure points of these vital biological assemblies.

Keywords:
Atomic force microscopyBacteriophageBiophysicsCapsidForce spectroscopyMaterials scienceMechanical propertiesNanoindentationProtein shellVirus

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Proteinaceous assemblies, including viral capsids, are crucial biological structures.
  • Understanding their mechanical properties is essential for elucidating structure-function relationships.

Purpose of the Study:

  • To provide detailed experimental procedures for mechanical characterization of protein nanoshells using atomic force microscopy (AFM).
  • To enable quantitative analysis of nanoshell mechanical properties in near-physiological conditions.

Main Methods:

  • Single-particle nanoindentation using AFM in liquid environments.
  • Detailed protocols for surface preparation, AFM imaging, and force-distance curve acquisition.
  • Methodology for analyzing mechanical parameters like spring constant, Young's modulus, and failure points.

Main Results:

  • AFM nanoindentation allows for precise measurement of mechanical properties at the single-particle level.
  • The described methods facilitate the determination of critical mechanical parameters for protein nanoshells.
  • Probing in liquid enables studies relevant to physiological environments.

Conclusions:

  • AFM nanoindentation is a powerful technique for characterizing the mechanical behavior of protein nanoshells.
  • Detailed experimental protocols are crucial for reliable and reproducible mechanical measurements.
  • This approach advances the understanding of protein shell mechanics and their biological roles.