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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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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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Intermolecular Forces in Solutions02:28

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels
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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels

Published on: August 21, 2018

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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels.

Luai R Khoury1, Joel Nowitzke1, Narayan Dahal1

  • 1Department of Physics, University of Wisconsin-Milwaukee.

Journal of Visualized Experiments : Jove
|September 11, 2018
PubMed
Summary
This summary is machine-generated.

A novel force-clamp rheometry method precisely measures the biomechanical properties of low-volume protein hydrogels. This technique characterizes protein unfolding and refolding dynamics under controlled force, advancing biomaterial and protein mechanics research.

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Area of Science:

  • Biomaterials Science
  • Protein Engineering
  • Rheology

Background:

  • Protein-based hydrogels are crucial biomaterials with complex mechanical properties.
  • Understanding protein behavior under mechanical stress is vital for biomaterial design and function.
  • Existing methods often require larger sample volumes, limiting analysis of low-concentration or scarce protein samples.

Purpose of the Study:

  • To introduce and validate a force-clamp rheometry method for characterizing protein-based hydrogels.
  • To enable the study of biomechanical properties using extremely low sample volumes (< 5 µL).
  • To investigate protein unfolding and refolding dynamics under controlled mechanical forces.

Main Methods:

  • Utilized an analog proportional-integral-derivative (PID) system for precise force control.
  • Employed a setup tethering cylindrical hydrogel samples between a voice-coil motor and a force transducer.
  • Applied controlled force-ramp and constant-force protocols to assess hydrogel responses.

Main Results:

  • Successfully characterized elasticity and hysteresis behaviors related to protein (un)folding.
  • Enabled measurement of standard elastic and viscoelastic parameters.
  • Decoupled elastic and viscoelastic responses under constant-force protocols, revealing protein domain unfolding/refolding dynamics.

Conclusions:

  • Force-clamp rheometry offers a versatile, low-volume approach for bulk analysis of protein mechanical responses.
  • The method is optimized for investigating protein mechanics under various force perturbations.
  • This technique advances the characterization of protein-based biomaterials.