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Related Concept Videos

Imaging Biological Samples with Optical Microscopy01:18

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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.
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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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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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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: May 5, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Optical coherence tomography-based micro-particle image velocimetry.

Mircea Mujat, R Daniel Ferguson, Nicusor Iftimia

    Optics Letters
    |December 11, 2013
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    Optical coherence tomography (OCT) is now used for marine flow analysis. This new OCT micro-particle image velocimetry technique offers high-resolution insights into near-wall hydrodynamic phenomena.

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    Area of Science:

    • Fluid dynamics
    • Optical engineering
    • Marine science

    Background:

    • Optical coherence tomography (OCT) is a widely used biomedical imaging technique.
    • Near-wall hydrodynamics are crucial in marine research but challenging to study at microscopic scales.

    Purpose of the Study:

    • To introduce a novel application of OCT for detailed flow analysis in marine hydrodynamics.
    • To demonstrate the capability of OCT micro-particle image velocimetry for near-wall flow measurements.

    Main Methods:

    • Development and application of OCT micro-particle image velocimetry (OCT-PIV).
    • High-resolution imaging of flow phenomena within the first millimeter of a boundary layer.
    • Flow statistics measurement in controlled laboratory settings.

    Main Results:

    • Successful demonstration of OCT-PIV in a small flow cuvette.
    • Validation of the technique in a water tunnel experiment.
    • High-resolution visualization of microscopic flow patterns near a wall.

    Conclusions:

    • OCT-PIV is a powerful new tool for studying near-wall hydrodynamics in marine environments.
    • The technique provides unprecedented detail on flow behavior within boundary layers.
    • This advancement has significant implications for marine research and engineering.