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Related Concept Videos

Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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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.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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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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Total Internal Reflection Fluorescence Microscopy01:05

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
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Optical Sectioning for Reflection Interference Microscopy: Quantitative Imaging at Soft Interfaces.

Cathie Ventalon1, Oksana Kirichuk2, Yotam Navon3

  • 1Institut de Biologie de l'ENS (IBENS), Département de biologie, École normale supérieure, CNRS, INSERM, Université PSL, 75005 Paris, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 14, 2025
PubMed
Summary
This summary is machine-generated.

Reflection interference contrast microscopy (RICM) can now image complex samples with improved clarity. New optical sectioning methods reduce background noise, enhancing quantitative analysis of thin films and cell-substrate interactions.

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Area of Science:

  • Biophysics
  • Soft Matter Science
  • Biochemistry

Background:

  • Reflection interference contrast microscopy (RICM) is sensitive for thin films and cell-substrate interactions.
  • Improving RICM sensitivity and quantitative analysis is an ongoing area of research.
  • RICM faces challenges in complex environments with spurious reflections.

Purpose of the Study:

  • To demonstrate optical sectioning methods for reducing background in RICM.
  • To enhance quantitative imaging of complex biological and biomimetic samples using RICM.
  • To provide guidelines for implementing and optimizing these methods.

Main Methods:

  • Implementation of line confocal detection in RICM.
  • Application of structured illumination microscopy (SIM) with RICM.
  • Experimental characterization of image quality improvements.

Main Results:

  • Optical sectioning effectively reduces background noise in RICM.
  • Improved image quality enables quantitative imaging of cellular membranes, thin organic films, and biofunctional surfaces.
  • Demonstrated benefits of line confocal detection and SIM for RICM.

Conclusions:

  • Line confocal detection and structured illumination microscopy are effective optical sectioning methods for RICM.
  • These techniques enhance the quantitative analysis capabilities of RICM in complex samples.
  • The study provides practical guidance and a reproducible setup for advanced RICM applications.