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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...
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
Discrete-time Fourier transform01:26

Discrete-time Fourier transform

The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...

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Related Experiment Video

Updated: Jun 14, 2026

Dynamic Electrochemical Measurement of Chloride Ions
07:32

Dynamic Electrochemical Measurement of Chloride Ions

Published on: February 5, 2016

Jan Drenth (1925-2025).

Bauke W Dijkstra1, Rik K Wierenga2, Abraham J Schierbeek3

  • 1Laboratory of Biophysical Chemistry, University of Groningen, Groningen, The Netherlands.

Acta Crystallographica. Section D, Structural Biology
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

Jan Drenth, a notable figure, is being remembered for his contributions. His legacy continues to inspire and influence the field.

Keywords:
Jan Drenthobituary

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Area of Science:

  • Biographical Studies
  • History of Science

Background:

  • Recalling the life and work of Jan Drenth.
  • Highlighting his significant impact and lasting influence.

Purpose of the Study:

  • To commemorate Jan Drenth's legacy.
  • To reflect on his contributions to the scientific community.

Main Methods:

  • Biographical research and historical analysis.
  • Review of Drenth's published works and impact.

Main Results:

  • Jan Drenth made significant contributions.
  • His work continues to be recognized and valued.

Conclusions:

  • The memory of Jan Drenth endures.
  • His influence serves as an inspiration for future endeavors.