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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)

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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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
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Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Masking and Demasking Agents01:19

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

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Published on: July 5, 2016

Digital holography-based steganography.

Habib Hamam1

  • 1Faculty of Engineering, University of Moncton, Montcon, New Brunswick, E1A 3E9, Canada. Habib.Hamam@umoncton.ca

Optics Letters
|December 18, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel steganographic method using digital holography to embed secret images within cover images. The technique achieves high hiding capacity while maintaining imperceptible changes to the cover image.

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Area of Science:

  • Computer Science
  • Information Security
  • Digital Image Processing

Background:

  • Steganography aims to conceal information within other data.
  • High-capacity steganographic methods are crucial for secure data transmission.
  • Digital holography offers potential for advanced information embedding.

Purpose of the Study:

  • To develop a steganographic method with high hiding capacity.
  • To utilize digital holography for distributing secret image data within a cover image.
  • To ensure imperceptible modifications to the cover image.

Main Methods:

  • Employing digital holography techniques to create a hologram from a secret image.
  • Using an iterative algorithm to design phase-only or complex holograms.
  • Quantizing hologram data based on available carrier data bits in the cover image.
  • Embedding hologram data into low-order bits of large-amplitude cover pixels.

Main Results:

  • Achieved high data hiding capacity.
  • Maintained imperceptibility of embedded data to casual observers.
  • Demonstrated a peak signal-to-noise ratio (PSNR) of over 40 dB, indicating minimal distortion.

Conclusions:

  • The proposed digital holography-based steganographic method effectively conceals information with high capacity.
  • The technique ensures visual imperceptibility, making it suitable for covert communication.
  • The method offers a robust approach to steganography with significant practical implications.