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Related Concept Videos

Methods to Assess Microbial Populations01:30

Methods to Assess Microbial Populations

Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...

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High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy
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Published on: July 25, 2014

Identifying multiple populations from single-molecule lifetime distributions.

Mark Kastantin1, Daniel K Schwartz

  • 1Department of Chemical and Biological Engineering, University of Colorado, Boulder, 80309, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|December 21, 2012
PubMed
Summary
This summary is machine-generated.

Single-molecule tracking microscopy can now quantify multiple molecular populations and their dynamics. This advanced analysis method overcomes limitations in sensitivity and timescale variation for heterogeneous systems.

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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
  • Materials Science
  • Biochemistry

Background:

  • Single-molecule methods offer advantages over ensemble techniques for characterizing molecular heterogeneity.
  • Determining absolute dynamic parameters for multiple populations with varying timescales and sensitivities is challenging.

Purpose of the Study:

  • To develop a robust method for extracting quantitative absolute values of dynamic parameters from single-molecule data.
  • To improve the comparability of single-molecule experiments and bridge the gap with ensemble-averaged observations.

Main Methods:

  • Utilized single-molecule tracking microscopy to study fibrinogen protein adsorption and desorption.
  • Performed a combined analysis of molecular trajectories across a range of acquisition times.

Main Results:

  • Successfully extracted quantitative absolute values for multiple population fractions and residence times, even across orders of magnitude.
  • Identified up to six distinct molecular populations with timescales varying over three orders of magnitude.
  • Detected population fractions as small as 1 in 1000 with well-defined uncertainties.

Conclusions:

  • The developed approach enables accurate quantification of molecular heterogeneity from single-molecule data.
  • This method enhances the reliability and comparability of single-molecule experiments.
  • The findings facilitate the connection between single-molecule observations and ensemble-averaged measurements.