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Related Concept Videos

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...
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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.

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Related Experiment Video

Updated: Jul 6, 2026

Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction
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Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction

Published on: July 26, 2022

Objective-type dark-field illumination for scattering from microbeads.

I Braslavsky, R Amit, B M Jaffar Ali

    Applied Optics
    |March 28, 2008
    PubMed
    Summary
    This summary is machine-generated.

    We developed a dark-field microscopy technique to track tiny particles near surfaces. This method successfully detected 20-nm gold particles and tracked 60-nm beads, enabling visualization of Brownian motion.

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    Simultaneous Interference Reflection and Total Internal Reflection Fluorescence Microscopy for Imaging Dynamic Microtubules and Associated Proteins

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    Area of Science:

    • Microscopy
    • Nanotechnology
    • Biophysics

    Background:

    • Accurate detection and tracking of nanoscale particles in solution near surfaces are crucial for understanding various physical and biological processes.
    • Traditional microscopy techniques can struggle with low signal-to-noise ratios when imaging small particles.

    Purpose of the Study:

    • To introduce a novel dark-field illumination method for enhanced detection and tracking of sub-micron particles.
    • To demonstrate the method's capability in visualizing the dynamic behavior of nanoparticles.

    Main Methods:

    • Utilizing an objective-type total internal reflection microscope.
    • Implementing a beam-blocking strategy to achieve dark-field illumination by suppressing back-reflected light.
    • Analyzing scattered light from particles for detection and motion tracking.

    Main Results:

    • Successfully tracked the motion of 60-nanometer (nm) polystyrene beads with a signal-to-noise ratio (SNR) of 6.
    • Detected 20-nm gold particles with an SNR of 5.
    • Visualized the Brownian motion of small beads tethered to a substrate via DNA.

    Conclusions:

    • The developed dark-field microscopy method significantly improves particle detection and tracking sensitivity.
    • This technique offers a valuable tool for studying nanoparticle dynamics and interactions at interfaces.
    • The method is applicable to observing complex phenomena like DNA-tethered bead motion.