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Related Concept Videos

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...
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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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Fabrication and Testing of Miniature Automatic Photophoretic Trapping Rigs
06:57

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Published on: November 23, 2021

A minimal optical trapping and imaging microscopy system.

Carmen Noemí Hernández Candia1, Sara Tafoya Martínez, Braulio Gutiérrez-Medina

  • 1Program in Molecular Biology, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, Mexico.

Plos One
|March 2, 2013
PubMed
Summary

Researchers developed a simple optical trapping system for visualizing single biomolecules like DNA and motor proteins. This versatile setup allows for precise measurements of molecular forces and displacements.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Optical Physics

Background:

  • Single-molecule studies are crucial for understanding biological processes at the molecular level.
  • Existing optical trapping systems can be complex and require numerous components.
  • High-resolution imaging is essential for observing nanoscale biological structures and dynamics.

Purpose of the Study:

  • To design and validate a simple, versatile optical trapping apparatus for single-molecule biophysics.
  • To enable visualization of individual microtubules and facilitate single-molecule force and displacement measurements.
  • To provide an accessible alternative for biomolecular and biomaterials research.

Main Methods:

  • Construction of a versatile optical trapping system using a minimal component set.
  • Integration with a conventional inverted microscope and bright-field illumination.
  • Utilizing a single laser beam for optical trapping and molecular measurements.
  • Employing digital image processing for real-time, high-contrast sample visualization.

Main Results:

  • Successful visualization of individual microtubules (approximately 25 nm in diameter).
  • Accurate measurement of DNA persistence length using the developed apparatus.
  • Real-time tracking of single kinesin motor protein stepping along microtubules.
  • Demonstrated enhanced contrast and reduced noise in sample imaging.

Conclusions:

  • The developed optical trapping apparatus is simple, versatile, and effective for single-molecule studies.
  • This system offers a cost-effective and straightforward alternative for biomolecular research.
  • The technology facilitates detailed investigation of biomaterials and individual biomolecules' behavior.