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Related Concept Videos

Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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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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,...
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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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Related Experiment Video

Updated: Feb 25, 2026

Implementation of Interference Reflection Microscopy for Label-free, High-speed Imaging of Microtubules
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Gradient light interference microscopy for 3D imaging of unlabeled specimens.

Tan H Nguyen1, Mikhail E Kandel1, Marcello Rubessa2

  • 1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, 61801, USA.

Nature Communications
|August 9, 2017
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Summary

Gradient Light Interference Microscopy (GLIM) offers label-free, 3D imaging for thick biological tissues by suppressing scattered light. This quantitative phase method enables precise measurements of cell properties over time.

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Area of Science:

  • Biomedical Optics
  • Quantitative Phase Imaging
  • Microscopy Techniques

Background:

  • Optical imaging of thick specimens is hindered by multiple scattering, limiting contrast and depth penetration.
  • Conventional methods often require labeling, which can affect cell viability and introduce artifacts.
  • Existing techniques struggle to provide label-free, quantitative 3D information from scattering biological tissues.

Purpose of the Study:

  • To introduce Gradient Light Interference Microscopy (GLIM) as a novel technique for label-free 3D imaging.
  • To overcome the limitations of multiple scattering in optical microscopy for thick specimens.
  • To enable quantitative measurements of cellular properties, such as mass and volume, over time.

Main Methods:

  • GLIM utilizes a specialized form of low-coherence interferometry to extract phase information.
  • The method combines multiple intensity images with controlled phase shifts between interfering beams.
  • It functions as an add-on module for existing inverted microscopes, facilitating integration.

Main Results:

  • GLIM effectively suppresses incoherent background noise caused by multiple scattering.
  • The technique allows for the extraction of quantitative 3D information from both thin and thick unlabeled specimens.
  • Measurements of cell mass, volume, and surface area, along with their temporal dynamics, are achievable.

Conclusions:

  • GLIM provides a robust solution for label-free 3D imaging in scattering biological tissues.
  • Its ability to suppress scattering and provide quantitative data makes it suitable for sensitive applications like in vitro fertilization.
  • The compatibility with existing microscopes suggests rapid adoption within the biological research community.