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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
Mass Spectrum01:23

Mass Spectrum

A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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...
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...

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Mass-Sensitive Particle Tracking to Characterize Membrane-Associated Macromolecule Dynamics
13:30

Mass-Sensitive Particle Tracking to Characterize Membrane-Associated Macromolecule Dynamics

Published on: February 18, 2022

Mass action at the single-molecule level.

Min Ju Shon1, Adam E Cohen

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Journal of the American Chemical Society
|August 15, 2012
PubMed
Summary
This summary is machine-generated.

We created a new system for studying molecular dynamics using single-molecule fluorescence in tiny nanofabricated dimples. This method reveals statistical fluctuations in confined reactions, offering new insights beyond bulk chemistry.

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Area of Science:

  • Physical Chemistry
  • Nanotechnology
  • Chemical Physics

Background:

  • Studying molecular dynamics and reactions at the single-molecule level is crucial for understanding fundamental chemical processes.
  • Traditional bulk chemistry methods often mask phenomena observable only in confined or low-molecule-number systems.
  • Existing techniques may struggle with long-term, attachment-free observation of individual molecules.

Purpose of the Study:

  • To develop a novel system for the reversible encapsulation of small numbers of molecules.
  • To enable attachment-free, long-term, and highly parallel studies of molecular dynamics.
  • To investigate bimolecular reactions in confined geometries and observe statistical mechanics phenomena.

Main Methods:

  • Fabrication of an array of nanoscale "dimples" for molecular confinement.
  • Utilization of single-molecule fluorescence microscopy for dynamic observation.
  • Reversible encapsulation techniques to control molecular populations within dimples.

Main Results:

  • Demonstrated a system capable of reversibly trapping small molecular quantities.
  • Observed phenomena related to statistical fluctuations in reaction equilibria and rates within confined chambers.
  • Identified steady-state fluctuations arising from chamber occupancy variations.

Conclusions:

  • The developed system facilitates novel studies of molecular dynamics and reactions in confined spaces.
  • Statistical fluctuations, though predicted by statistical mechanics, become observable and significant in low-molecule-number confined systems.
  • These findings have implications for reactions occurring in various confined environments, including microfluidics and biological systems.