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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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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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High Content Screening in Neurodegenerative Diseases
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Microscopy-Based High-Content Screening.

Michael Boutros1, Florian Heigwer2, Christina Laufer2

  • 1Division Signaling and Functional Genomics, German Cancer Research Center (DKFZ) and Department of Cell and Molecular Biology, Heidelberg University, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany; German Cancer Consortium (DKTK), 69120 Heidelberg, Germany.

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Summary
This summary is machine-generated.

Image-based screening, combined with perturbations, offers powerful insights into biological processes. Advances in imaging and analysis accelerate large-scale studies, including CRISPR applications.

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Area of Science:

  • * Cellular and organismal biology
  • * High-content screening and imaging
  • * Genomic engineering and functional genomics

Background:

  • * Image-based screening quantifies phenotypes in cells and organisms.
  • * Perturbations like RNA interference and small molecules enhance systematic biological insights.
  • * Applications span protein localization, cancer vulnerabilities, and organismal phenotypes.

Purpose of the Study:

  • * To review the state-of-the-art in image-based screening.
  • * To delineate experimental and image-analysis approaches.
  • * To discuss challenges and future directions, including CRISPR/Cas9.

Main Methods:

  • * Utilizes image-based screening with various perturbations (RNAi, small molecules, mutations).
  • * Employs advanced imaging and image-analysis methodologies for large-scale screens.
  • * Highlights the integration of CRISPR/Cas9 genome engineering.

Main Results:

  • * Image-based screening provides systematic insights into biological processes.
  • * Recent advances accelerate large-scale perturbation screens.
  • * Discusses current capabilities and limitations of the technology.

Conclusions:

  • * Image-based screening is a powerful tool for biological discovery.
  • * Continued advancements in imaging and analysis are crucial.
  • * CRISPR/Cas9 integration promises expanded applications.