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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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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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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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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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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Single molecule imaging using X-ray free electron lasers.

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Imaging single molecules in action using X-ray lasers (XFELs) is a promising technique. While progress has been made, achieving true single particle imaging requires further advancements.

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Area of Science:

  • Structural biology
  • Biophysics
  • X-ray science

Background:

  • X-ray Free Electron Lasers (XFELs) offer unprecedented brightness for probing matter at the molecular level.
  • Imaging single molecules in action without crystallization is a long-standing goal in structural biology.
  • Significant advancements have been made towards this goal, but it remains challenging.

Purpose of the Study:

  • To review the current status of X-ray single particle imaging.
  • To outline the necessary steps for achieving molecular imaging using XFELs.
  • To discuss the potential applications of single molecule imaging.

Main Methods:

  • Review of experimental techniques and theoretical approaches in X-ray single particle imaging.
  • Analysis of progress in data acquisition and computational reconstruction methods.
  • Discussion of challenges related to radiation damage and signal-to-noise ratio.

Main Results:

  • Demonstration of progress in imaging larger biomolecules and cellular structures.
  • Identification of key limitations hindering the resolution and scope of current methods.
  • Highlighting the potential of novel X-ray sources and detector technologies.

Conclusions:

  • X-ray single particle imaging is advancing, but not yet fully realized.
  • Further development in experimental setups and data analysis is crucial.
  • Achieving the goal of imaging single molecules in action will revolutionize structural biology.