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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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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...
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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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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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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Related Experiment Video

Updated: May 2, 2026

Conducting Multiple Imaging Modes with One Fluorescence Microscope
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Single-Molecule Fluorescence Defines a New Dye Chemistry.

Lujia Yang1, Ying Zheng1,2, Zhiwei Ye1

  • 1State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

Chemical & Biomedical Imaging
|May 1, 2026
PubMed
Summary
This summary is machine-generated.

Super-resolution microscopy revitalizes old fluorescent dyes. This review details how atomic-level structural changes improve dye performance for enhanced single-molecule imaging resolution.

Keywords:
brightnessfluorescent dyesphotochromismphotostabilitysingle-molecule localizationsingle-molecule photophysicssuper-resolution microscopyswitching kinetics

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Area of Science:

  • Biophysics
  • Microscopy
  • Chemical Biology

Background:

  • Super-resolution microscopy demands specific photophysical properties from fluorescent dyes.
  • Conventional ensemble averaging methods are surpassed by single-molecule resolution techniques.
  • Millisecond temporal resolution and nanometer spatial precision are key requirements.

Purpose of the Study:

  • To review fundamental principles of single-molecule fluorescence.
  • To correlate dye structure with single-molecule fluorescence characteristics.
  • To guide the development of next-generation fluorescent dyes.

Main Methods:

  • Analysis of single-molecule photon flux and switching kinetics.
  • Examination of structure-function relationships in fluorescent dyes.
  • Review of atomic-level structural modifications impacting fluorescence.

Main Results:

  • Single-molecule fluorescence is governed by photon flux, switching kinetics, and structure-function correlations.
  • Structural modulation at the atomic level is crucial for tuning fluorescence properties.
  • A taxonomy of structural modifications for regulating fluorescence is proposed.

Conclusions:

  • Understanding fundamental principles enables the engineering of advanced fluorescent dyes.
  • Tailoring dye structure is key to enhancing super-resolution microscopy.
  • This review provides guidelines for future dye development efforts.