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Related Concept Videos

Total Internal Reflection Fluorescence Microscopy01:05

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Related Experiment Video

Updated: Nov 22, 2025

Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
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High-performance imaging of cell-substrate contacts using refractive index quantification microscopy.

Ziqiang Xin1, Chonglei Zhang1,2, Lixun Sun1

  • 1Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology & Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China.

Biomedical Optics Express
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces refractive index quantification microscopy (RIQM) for label-free live-cell imaging. The technique offers high resolution for studying cell adhesion and extracellular matrix interactions in glioma cells.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Non-invasive imaging is crucial for life sciences and medical research.
  • Label-free techniques are needed to study cellular processes without altering cell behavior.

Purpose of the Study:

  • To demonstrate a novel refractive index quantification microscopy (RIQM) for label-free live-cell imaging.
  • To investigate glioma cell-substrate contacts, including cell adhesion molecules and the extracellular matrix.

Main Methods:

  • Utilizing an azimuthally polarized perfect optical vortex beam (POV) tightly focused with a first-order spiral phase.
  • Achieving high imaging resolution and high refractive index (RI) resolution for detailed cellular analysis.

Main Results:

  • RIQM enables label-free studies of cell-substrate contacts.
  • High RI resolution allows monitoring of RI distribution within neuronal cells.
  • The microscopy effectively recognizes cellular structures and activities.

Conclusions:

  • RIQM is a powerful tool for biological sensing and live-cell kinetic imaging.
  • The technique shows great potential for advancing research in cell biology and neuroscience.