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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Multi-Step Reactions02:31

Multi-Step Reactions

Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

The rate-determining step, or RDS, in a chemical reaction is the slowest step that determines the overall reaction rate. It is identified by using the observed rate law and typically involves approximation methods like the RDS approximation or the steady-state approximation.In the RDS approximation, also known as the rate-limiting-step or equilibrium approximation, the reaction mechanism consists of one or more reversible reactions near equilibrium, followed by a slower RDS, and then one or...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...

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Updated: May 25, 2026

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
06:48

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

Reaction pathways from single-molecule trajectories.

Haifeng Yuan1, Michel Orrit

  • 1MoNOS, Huygens Laboratory, Leiden University, Leiden, The Netherlands.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

Signal-pair histograms track molecular state changes, enabling the reconstruction of kinetic pathways. This method offers new opportunities for studying molecular dynamics.

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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Area of Science:

  • Biophysics
  • Chemical Kinetics
  • Molecular Dynamics

Background:

  • Understanding molecular dynamics is crucial for various scientific fields.
  • Current methods for analyzing molecular transitions can be limited.

Purpose of the Study:

  • To introduce signal-pair histograms as a novel method for analyzing molecular transitions.
  • To demonstrate the utility of this technique in reconstructing kinetic pathways.

Main Methods:

  • Development and application of signal-pair histogram analysis.
  • Mapping transitions between different molecular states using experimental data.

Main Results:

  • Signal-pair histograms effectively visualize and quantify transitions between molecular states.
  • The method facilitates the reconstruction of complex kinetic pathways.

Conclusions:

  • Signal-pair histograms provide a powerful new tool for studying single-molecule dynamics.
  • This approach opens avenues for deeper insights into molecular mechanisms and reaction kinetics.