Polarizing Microscopy
Polarizing Microscopy - Related Videos
01:01
Group Polarization
0 Views •
2020
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition. The phenomenon of group polarization explains many actions taken by groups that would not...
10:10
Measurement of Liver Stiffness Using Atomic Force Microscopy Coupled with Polarization Microscopy
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Cited by 15 •
2022
We present a protocol to measure the elastic moduli of collagen-rich areas in normal and diseased liver using atomic force microscopy. The simultaneous use of polarization microscopy provides high spatial precision for localizing collagen-rich areas in the liver sections.
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
05:54
Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
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Cited by 1 •
2023
This paper describes how polarization-sensitive two-photon microscopy could be applied to characterize the local organization within label-free amyloid superstructures-spherulites. It also describes how to prepare and measure the sample, assemble the required setup, and analyze the data to obtain information about the local organization of amyloid fibrils.
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Cited by 2 •
2016
A protocol to detect and automate mode locking in a pre-adjusted nonlinear polarization rotation fiber laser is presented. The detection of a sudden change in the output polarization state when mode locking occurs is used to command the alignment of an intra-cavity polarization controller in order to find mode-locking conditions.
FAQs
The polarizer establishes a preferred light orientation before the specimen, while the analyzer evaluates how that orientation changes after passage through the sample. Birefringent material alters the light’s polarization, allowing the analyzer to convert that change into visible intensity differences. Selecting the analyzer angle therefore affects contrast and helps reveal structures that would be less apparent under ordinary illumination.
Anisotropic materials interact with light differently depending on the light’s orientation within the specimen. That directional behavior can change the polarization state and produce brightness, extinction, or interference colors after the analyzer. Crystalline substances are consequently prominent targets, because their optical response can distinguish them from materials that do not produce the same polarization-dependent contrast.
These visual outcomes reflect how the specimen modifies polarized light and how the analyzer is positioned relative to that altered light. Some regions transmit enough changed light to appear bright, whereas others reach an extinction condition and appear dark. More complex polarization changes can generate interference colors, providing additional visual information about birefringent components.
The specimen is examined within the light path between a polarizer and an analyzer. Light first passes through the polarizer, then interacts with the sample, and finally reaches the analyzer, which is oriented at a selected angle. Observing the resulting contrast against a dark background allows birefringent structures or materials to be assessed with minimal specimen alteration.
In clinical assessment, the method can help detect and characterize crystals in samples associated with gout and pseudogout. Monosodium urate crystals are associated with gout, while calcium pyrophosphate crystals are associated with pseudogout. Their birefringent behavior provides optical evidence that supports recognition of these substances during rapid microscopic examination.
Polarizing microscopy can reveal birefringent materials within tissue sections as well as crystalline substances in clinical specimens. Because the technique provides contrast without requiring extensive alteration of the sample, it supports rapid, minimally destructive assessment. In pathology and medicine, these observations can help identify and characterize unusual materials that may be difficult to recognize by standard illumination alone.