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Related Concept Videos

Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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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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Overview of Microscopy Techniques01:22

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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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Three-Dimensional Microscopy in Microbiology01:28

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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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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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Studying the Cytoskeleton01:17

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Updated: Jul 25, 2025

Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy
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Advanced Microscopy Techniques for Molecular Biophysics.

Laura Barsanti1, Lorenzo Birindelli1, Francesca Sbrana2

  • 1Istituto di Biofisica, CNR, Via Moruzzi 1, 56124 Pisa, Italy.

International Journal of Molecular Sciences
|June 28, 2023
PubMed
Summary

Advanced microscopy techniques like microspectrophotometry, super-resolution localization microscopy, and holotomographic microscopy enable quantitative, non-destructive analysis of cellular structures. These methods reveal molecular organization and biophysical properties within cells with high resolution.

Keywords:
Euglena gracilisholotomographykleptoplastidsmicrospectrophotometrystimulated emission depletion microscopy (STED)super-resolutiontrout photoreceptors

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Area of Science:

  • Cell Biology
  • Biophysics
  • Microscopy

Background:

  • Microscopy traditionally offers qualitative insights into cellular properties.
  • Quantitative measurements require advanced instrumentation to analyze complex biological structures.
  • Subcellular compartments often contain structurally organized molecules crucial for cellular functions.

Purpose of the Study:

  • To review advanced microscopy techniques for quantitative analysis of cellular and subcellular properties.
  • To highlight microspectrophotometry (MSP), super-resolution localization microscopy (SRLM), and holotomographic microscopy (HTM).
  • To demonstrate how these techniques provide insights into molecular organization and biophysical properties.

Main Methods:

  • Microspectrophotometry (MSP) uses a microscope and polychromator for spectroscopic measurements (e.g., absorption spectra).
  • Super-resolution localization microscopy (SRLM) overcomes the diffraction limit for detailed visualization of subcellular structures and dynamics.
  • Holotomographic microscopy (HTM) combines holography and tomography for 3D reconstruction and phase separation analysis.

Main Results:

  • These techniques enable non-destructive investigations at macromolecular resolution.
  • They provide detailed insights into the role of intracellular molecular organizations (e.g., photoreceptors, lipid bodies).
  • Applications include analyzing fish and algae photoreceptors, single proteins, and lipid aggregates.

Conclusions:

  • Advanced microscopy techniques are powerful tools for quantitative, high-resolution biological investigations.
  • MSP, SRLM, and HTM offer unique capabilities for studying cellular structures and functions.
  • These methods advance our understanding of biophysical properties and molecular roles in cellular processes.