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Related Concept Videos

Immunofluorescence Microscopy01:12

Immunofluorescence Microscopy

A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
The...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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...
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.
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
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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Updated: May 7, 2026

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
10:34

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

Published on: August 20, 2012

An introduction to fluorescence imaging techniques geared towards biosensor applications.

J Goedhart1, Mark A Hink, Kees Jalink

  • 1Section of Molecular Cytology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands.

Methods in Molecular Biology (Clifton, N.J.)
|September 21, 2013
PubMed
Summary

This chapter details fluorescence and Förster Resonance Energy Transfer (FRET) recording methods, focusing on microscopy for biosensor imaging. It guides instrument selection, detection techniques, and practical considerations for successful FRET experiments.

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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

Published on: August 20, 2012

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
10:57

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Published on: November 2, 2009

Area of Science:

  • Biophysics
  • Molecular Biology
  • Microscopy

Background:

  • Fluorescence and Förster Resonance Energy Transfer (FRET) are fundamental biophysical techniques.
  • FRET is widely utilized in biosensor imaging for studying molecular interactions.
  • Effective FRET recording is crucial for accurate biological interpretation.

Purpose of the Study:

  • To provide a comprehensive overview of FRET recording methodologies.
  • To emphasize microscopy-based techniques for biosensor applications.
  • To offer practical guidelines for experimental design and execution.

Main Methods:

  • Discussion of basic fluorescence and FRET principles.
  • Detailed examination of microscopy methods for FRET detection.
  • Exploration of intensity-based and donor lifetime-based FRET measurements.

Main Results:

  • Guidance on selecting appropriate instruments for FRET recording.
  • Strategies for matching recording methods to specific experimental needs.
  • Identification of critical practical considerations impacting experimental success.

Conclusions:

  • Microscopy offers versatile FRET detection for biosensor imaging.
  • Careful instrument selection and method matching enhance FRET experiment reliability.
  • Addressing practical challenges is key to successful FRET data acquisition.