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Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Group Polarization

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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.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Related Experiment Video

Updated: May 2, 2026

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
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[Depth selectivity by using polarization-controlled spectral technique].

Xu Feng1, Li-Qun Sun2, En-Yao Zhang2

  • 1State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, China. xfeng89@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|February 22, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel orthogonal polarization spectral (OPS) microcirculation imaging system. The system achieves continuous depth selectivity by controlling light polarization, enhancing microcirculation imaging capabilities.

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Area of Science:

  • Biomedical Optics
  • Microscopy
  • Medical Imaging

Context:

  • Traditional orthogonal polarization spectral (OPS) systems are limited to 2D imaging of specific cross-sections.
  • Microcirculation imaging is crucial for understanding tissue perfusion and disease states.
  • Mechanical scanning in microscopy can be cumbersome and may affect delicate biological samples.

Purpose:

  • To develop a microcirculation imaging system with continuous depth selectivity.
  • To enable microscopy refocusing without mechanical sample scanning.
  • To improve signal-to-noise ratio for enhanced microcirculation detection.

Summary:

  • A modified OPS system utilizes controlled elliptical polarization for non-mechanical microscopy refocusing, enabling imaging at different depths.
  • The system optimizes light source emission and erythrocyte absorption spectra for high signal-to-noise ratio.
  • Experiments demonstrate that increasing polarization from linear to circular enhances image contrast and maximum visible depth, with successful imaging of mouse auricle vessels.

Impact:

  • Provides a new method for depth-selective microcirculation imaging.
  • Offers enhanced microscopy refocusing capabilities for biological tissues.
  • Potential for improved diagnosis and monitoring of microvascular diseases.