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Scanning Electron Microscopy01:07

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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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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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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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Related Experiment Video

Updated: May 5, 2026

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
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Observations on estuarine microfouling using the scanning electron microscope.

L H Disalvo1, G W Daniels

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Summary
This summary is machine-generated.

Water-repellent coatings reduce bacterial slime adhesion on glass surfaces in estuarine environments. Attached bacteria also facilitate the settlement of other particles, impacting microbial fouling.

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Area of Science:

  • Environmental microbiology
  • Materials science

Background:

  • Microbiological primary fouling of submerged surfaces is a significant issue in marine and estuarine environments.
  • Understanding the initial stages of biofilm formation on artificial substrates like glass is crucial for developing effective anti-fouling strategies.

Purpose of the Study:

  • To investigate the effect of water-repellent coatings on bacterial adhesion to glass surfaces.
  • To examine the role of attached bacteria in the subsequent settlement of other particles.

Main Methods:

  • Scanning electron microscopy (SEM) was employed to visualize and analyze microbiological fouling on glass.
  • Experiments were conducted using clean glass and glass treated with water-repellent coatings.
  • Pure cultures of bacteria and latex particles were used to study settlement dynamics.

Main Results:

  • Bacterial slimes exhibited significantly weaker adhesion to water-repellent coated glass compared to clean glass.
  • The presence of attached bacteria was observed to promote the settlement of latex particles onto the glass surface.

Conclusions:

  • Water-repellent surface treatments show promise in reducing primary microbial fouling.
  • Bacterial colonization acts as a nucleation sites, enhancing the attachment of subsequent particles and contributing to biofilm development.