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Scanning probe microscopy in microbiology

M Firtel1, T J Beveridge

  • 1Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada.

Micron (Oxford, England : 1993)
|January 1, 1995
PubMed
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Scanning probe microscopy (SPM) offers high-resolution analysis of biological surfaces, advancing cellular and molecular biology. Atomic force microscopy (AFM) now enables imaging of native structures, paving the way for visualizing dynamic molecular events.

Area of Science:

  • Microbiology
  • Biophysics
  • Nanotechnology

Background:

  • Scanning probe microscopy (SPM) is an emerging technique for analyzing submicron details on biological surfaces, offering an alternative to electron microscopy.
  • Microbiological specimens have been crucial in developing scanning tunneling microscopy (STM) and atomic force microscopy (AFM) for cellular and molecular biology.
  • Early STM studies showed resolution comparable to transmission electron microscopy (TEM) but were limited by metal graininess and struggled with imaging native biomaterials.

Purpose of the Study:

  • To highlight the evolution and expanding applications of SPM, particularly AFM, in analyzing microbiological specimens.
  • To demonstrate the progression of AFM from basic topography imaging to analyzing surface properties and manipulating molecules.
  • To suggest the future potential of SPM for visualizing dynamic molecular processes.

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Main Methods:

  • Utilized scanning tunneling microscopy (STM) for early analyses of metal-coated biological specimens.
  • Employed atomic force microscopy (AFM) for imaging native biological structures and analyzing surface properties.
  • Investigated applications including surface structure analysis, elastic and inelastic property measurements, and molecular manipulation.

Main Results:

  • STM achieved resolutions comparable to TEM on prepared specimens, with limitations due to metal graininess.
  • STM proved unreliable for imaging native surfaces of biomaterials like proteins and nucleic acids.
  • AFM enabled imaging of native hydrated surfaces with nanometer-scale resolution, expanding SPM's utility.
  • AFM applications broadened to include surface property analysis and molecular manipulation (e.g., DNA).

Conclusions:

  • SPM, especially AFM, has significantly advanced the analysis of microbiological specimens at the nanoscale.
  • AFM's ability to image native hydrated surfaces overcomes limitations of earlier STM techniques.
  • The development of SPM suggests future possibilities for direct visualization of dynamic molecular events.