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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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...
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...
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.
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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...
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,...

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Related Experiment Video

Updated: Jul 2, 2026

Phase Contrast and Differential Interference Contrast (DIC) Microscopy
06:49

Phase Contrast and Differential Interference Contrast (DIC) Microscopy

Published on: August 6, 2008

Contrast enhancement in light microscopy.

H E Keller1

  • 1Carl Zeiss, Inc., Thornwood, New York, USA.

Current Protocols in Cytometry
|September 5, 2008
PubMed
Summary

Optical microscopes are key to image cytometry systems. This review covers essential light microscopy concepts like Köhler illumination, resolution, and contrast enhancement techniques for better performance.

Area of Science:

  • Optical microscopy
  • Image cytometry
  • Scientific instrumentation

Background:

  • Optical microscopes are integral to image cytometry.
  • Electronic imaging advances necessitate higher optical performance.
  • Understanding fundamental microscopy principles is crucial.

Purpose of the Study:

  • To review basic concepts of light microscopy.
  • To explain Köhler illumination, resolution, contrast, and numerical aperture.
  • To survey instruments and techniques for contrast enhancement.

Main Methods:

  • Literature review of optical microscopy principles.
  • Explanation of fundamental optical concepts.
  • Overview of contrast enhancement methods.

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Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging
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Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging

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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
14:09

Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope

Published on: April 7, 2014

Related Experiment Videos

Last Updated: Jul 2, 2026

Phase Contrast and Differential Interference Contrast (DIC) Microscopy
06:49

Phase Contrast and Differential Interference Contrast (DIC) Microscopy

Published on: August 6, 2008

Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging
07:15

Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging

Published on: July 11, 2025

Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
14:09

Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope

Published on: April 7, 2014

Main Results:

  • Detailed explanation of Köhler illumination.
  • Discussion of factors affecting resolution and contrast.
  • Categorization of various contrast enhancement techniques.

Conclusions:

  • Basic optical microscopy concepts are vital for advanced imaging.
  • Effective contrast enhancement is critical for image cytometry.
  • Knowledge of instruments and techniques optimizes microscope performance.