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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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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Related Experiment Video

Updated: Jul 10, 2026

Generation and Quantitative Characterization of Functional and Polarized Biliary Epithelial Cysts
09:55

Generation and Quantitative Characterization of Functional and Polarized Biliary Epithelial Cysts

Published on: May 16, 2020

Unique MR spectroscopic finding in colloid-like cyst.

Alagappan Periakaruppan1, Chandrasekharan Kesavadas, V V Radhakrishnan

  • 1Department of Imaging Sciences and Interventional Radiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.

Neuroradiology
|November 8, 2007
PubMed
Summary

Magnetic resonance imaging and spectroscopy revealed T1 hyperintense lesions in three patients with colloid-like cysts. A unique metabolite peak suggests glycoproteins, aiding diagnosis of these rare cysts in unusual locations.

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Generation and Quantitative Characterization of Functional and Polarized Biliary Epithelial Cysts
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Neuroradiology
  • Neuroimaging
  • Cystic lesions

Background:

  • Colloid cysts are typically found in the third ventricle.
  • Cysts with identical morphology rarely occur outside the third ventricle.

Observation:

  • Three female patients presented with colloid-like cysts in unusual locations: ponto-medullary, pre-pontine cistern, and suprasellar region.
  • Magnetic resonance (MR) imaging revealed T1 hyperintense mass lesions.
  • MR spectroscopy detected a dominant metabolite peak at 2.0-ppm chemical shift.

Findings:

  • The 2.0-ppm peak simulates N-acetylaspartate (NAA) from normal neuronal tissue.
  • This peak is likely attributed to glycoproteins secreted by the cyst's ciliated columnar epithelium.
  • This study is the first to describe MR spectroscopy findings for colloid cysts.

Implications:

  • The unique MR spectroscopy signature aids in diagnosing colloid-like cysts in atypical locations.
  • Understanding signal characteristics across various MR sequences (DWI, SWI) enhances diagnostic accuracy.
  • This research contributes novel insights into the neuroimaging of rare cystic lesions.