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Related Concept Videos

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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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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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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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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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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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Updated: Jan 27, 2026

Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions
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Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions

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Quantifying Molecular Forces with Serially Connected Force Sensors.

Yousif Murad1, Isaac T S Li1

  • 1Department of Chemistry, Biochemistry and Molecular Biology, The University of British Columbia, Kelowna, British Columbia, Canada.

Biophysical Journal
|March 24, 2019
PubMed
Summary
This summary is machine-generated.

Molecular force sensors called tension gauge tethers (TGTs) enable cell adhesion studies. A new computational model shows serially connected TGTs accurately quantify molecular forces, overcoming limitations of single TGTs.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biotechnology

Background:

  • Cell adhesion is crucial for biological processes.
  • Molecular force sensors, like tension gauge tethers (TGTs), measure forces in cell adhesion.
  • Quantitative interpretation of TGTs has been challenging.

Purpose of the Study:

  • To develop a computational method for quantitative interpretation of TGT fluorescence readout.
  • To investigate single TGTs, multiplexed TGTs, and serially connected TGTs.
  • To design a TGT system for accurate molecular force quantification.

Main Methods:

  • Computational modeling of TGT systems.
  • Analysis of single TGT, multiplexed TGT, and serially connected TGT configurations.
  • Investigation of receptor-ligand influence and TGT sequence composition.

Main Results:

  • Single TGT readout is ambiguous, influenced by force history and adhesion density.
  • TGT behavior depends on the receptor-ligand, requiring calibration.
  • Serially connected TGTs provide ratiometric readout independent of receptor-ligand.
  • Serially connected TGTs reconstruct force history with sub-pN resolution.
  • Tuning TGT sequence composition allows for adjustable dynamic range.

Conclusions:

  • Serially connected TGTs offer a robust and accurate method for quantifying molecular forces.
  • This computational study provides a foundation for experimental validation and application of TGTs.
  • The developed TGT system enhances precision in studying cell adhesion mechanics.