Related Experiment Video
Updated: Jun 27, 2026
08:16
Visualizing Intracellular Sialylation with Click Chemistry and Expansion Microscopy
Published on: February 7, 2025
Beyond the diffraction-limit biological imaging by saturated excitation microscopy.
Masahito Yamanaka1, Shogo Kawano, Katsumasa Fujita
1Osaka University, Department of Frontier Biosciences, 2-1 Yamadaoka, Suita, Osaka 565-871, Japan.
Journal of Biomedical Optics
|November 22, 2008
Summary
Saturated excitation (SAX) microscopy achieves high-resolution 3D fluorescence imaging. This technique enhances spatial resolution by saturating fluorophores, improving visualization of biological structures like microtubules in cells.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- High-resolution imaging is crucial for understanding cellular structures.
- Current fluorescence microscopy techniques face limitations in achieving optimal spatial resolution.
Purpose of the Study:
- To demonstrate a novel high-resolution fluorescence imaging technique: saturated excitation (SAX) microscopy.
- To improve the three-dimensional spatial resolution of fluorescence imaging in biological samples.
Main Methods:
- Utilizing high excitation intensity to saturate fluorescence molecules.
- Inducing strong nonlinear fluorescence responses at the laser focus.
- Applying SAX microscopy to observe stained microtubules in HeLa cells.
Main Results:
- Achieved improved spatial resolution in three dimensions.
- Successfully visualized stained microtubules in HeLa cells with enhanced detail.
- Confirmed SAX microscopy's potential for various fluorescence dyes and samples.
Conclusions:
- SAX microscopy offers a significant advancement in high-resolution fluorescence imaging.
- The technique is versatile and applicable to a wide range of current fluorescence samples.
- SAX microscopy provides enhanced visualization capabilities for biological research.
Related Concept Videos
01:37Super-resolution Fluorescence Microscopy
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 developed.
01:18Imaging Biological Samples with Optical Microscopy
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
01:28Three-Dimensional Microscopy in Microbiology
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...
01:16Confocal Fluorescence Microscopy
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...