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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Sanger Sequencing01:57

Sanger Sequencing

DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...

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Related Experiment Video

Updated: Jun 23, 2026

Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing
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Published on: December 1, 2016

Dyes from a twenty-first century perspective.

R W Dapson1, R W Horobin

  • 1Dapson & Dapson LLC, 6951 East AB Avenue, Richland, MI 49083, USA. dick@dapsons.com

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|April 23, 2009
PubMed
Summary
This summary is machine-generated.

Biomedical dyes and staining remain crucial despite declining research. Innovative studies in dye analysis, synthesis, and interactions, drawing from other fields, promise breakthroughs.

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Last Updated: Jun 23, 2026

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Area of Science:

  • Biomedical research
  • Dye chemistry
  • Histology

Background:

  • Biomedical dye research has seen a decline with the rise of new technologies.
  • Dyes and staining techniques remain essential in various scientific and medical applications.
  • There is a recognized need for continued innovation in the field of biomedical dyes.

Purpose of the Study:

  • To highlight the value of information from unrelated disciplines for biomedical dyes and staining.
  • To summarize current understanding of dye-tissue-solvent interactions in selective staining.
  • To underscore the ongoing importance and potential for advancement in dye research.

Main Methods:

  • A seminar was convened by the Biological Stain Commission in June 2008.
  • The seminar focused on interdisciplinary insights and modern staining mechanisms.
  • The proceedings introduced papers discussing dye analysis, synthesis, and mode of action.

Main Results:

  • Useful information applicable to biomedical dyes is available from diverse scientific fields.
  • Modern understanding of selective staining involves complex interactions between dyes, solvents, and tissues.
  • Despite reduced focus, dyes and staining continue to be vital tools.

Conclusions:

  • Interdisciplinary approaches and tools offer significant potential for breakthroughs in dye research.
  • Innovative studies in dye analysis, synthesis, and mode of action are needed.
  • Dyes and staining remain critically important in biomedical applications.