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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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Related Experiment Video

Updated: Jun 6, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Quantum dot blueing and blinking enables fluorescence nanoscopy.

Patrick Hoyer1, Thorsten Staudt, Johann Engelhardt

  • 1German Cancer Research Center (DKFZ), Optical Nanoscopy Division, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.

Nano Letters
|December 7, 2010
PubMed
Summary

We achieved superresolution fluorescence imaging using quantum dots, enabling nanoscale visualization of cellular structures with a simple webcam. This method overcomes the diffraction limit for detailed biological imaging.

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07:04

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Cell Biology

Background:

  • Conventional fluorescence microscopy is limited by the diffraction barrier, restricting resolution.
  • Superresolution techniques are crucial for visualizing cellular ultrastructures.
  • Quantum dots offer unique photophysical properties for advanced imaging applications.

Purpose of the Study:

  • To demonstrate superresolution fluorescence imaging of cells.
  • To utilize bioconjugated cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots as markers.
  • To achieve nanoscale resolution beyond the diffraction limit.

Main Methods:

  • Employing bioconjugated CdSe/ZnS quantum dots as fluorescent markers.
  • Utilizing fluorescence blueing of quantum dot cores to separate closely spaced markers.
  • Implementing ground state depletion microscopy with individual marker return.
  • Using a standard webcam for nanoscale imaging acquisition.

Main Results:

  • Achieved superresolution imaging with a resolving power of approximately 12 nm (the size of a single dot).
  • Successfully separated blinking quantum dot markers closer than the diffraction limit.
  • Demonstrated the feasibility of nanoscale imaging with simple equipment.

Conclusions:

  • Bioconjugated CdSe/ZnS quantum dots enable high-resolution cellular imaging.
  • The developed method overcomes the diffraction limit for nanoscale visualization.
  • Superresolution microscopy with quantum dots is accessible using basic hardware like a webcam.