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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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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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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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OverviewStaining techniques in microscopy enhance the visualization of microorganisms by increasing contrast and allowing the differentiation of cellular structures. Simple staining is one of the fundamental methods used to observe the basic morphological characteristics of microorganisms, including their size, shape, and arrangement. This method relies on the application of a single dye to stain the entire cell, producing a clear contrast between the cell and the background.FixationFixation is...
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Mitochondria and Endoplasmic Reticulum Imaging by Correlative Light and Volume Electron Microscopy
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Lighting Van Leeuwenhoek's samples.

Lesley A Robertson1

  • 1Department of Biotechnology and Delft Science Centre, Delft University of Technology, Mijnbouwstraat 120, 2628RX, Delft, The Netherlands.

FEMS Microbiology Letters
|November 28, 2017
PubMed
Summary
This summary is machine-generated.

Testing lighting for opaque samples with Van Leeuwenhoek microscopes revealed samples remain in shadow. This suggests his "particular method" may involve a different microscope design, possibly one available at the time.

Keywords:
Van Leeuwenhoekopaque samplessingle lens microscopes

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Area of Science:

  • Microscopy
  • Optical Instrumentation
  • Scientific History

Background:

  • Investigating historical microscopy techniques for opaque sample illumination.
  • Addressing challenges in visualizing non-transparent specimens with early microscopes.

Observation:

  • Van Leeuwenhoek microscope designs inherently place samples in shadow under top lighting.
  • Standard top-lighting methods are ineffective for illuminating opaque samples.

Findings:

  • Tested lighting techniques confirmed the inherent shadow issue in Van Leeuwenhoek microscopes.
  • Published literature on early microscopy was reviewed for comparative analysis.

Implications:

  • Suggests Antonie van Leeuwenhoek's 'particular method of observing' may not refer to his standard microscope.
  • Proposes his method might have utilized an alternative microscope design available during his era.
  • Highlights the importance of considering diverse historical optical equipment in scientific interpretation.