News tagged with dyes
New fluorescent dyes highlight neuronal activity
Researchers at the University of California, San Diego School of Medicine have created a new generation of fast-acting fluorescent dyes that optically highlight electrical activity in neuronal membranes. The ...
Jan 25, 2012 |
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Fluorescent dye pinpoints tiniest signs of oesophageal cancer
(Medical Xpress) -- A fluorescent dye that can be sprayed onto the oesophagus – the food pipe – could be used to detect oesophageal cancer earlier and spare patients unnecessary treatment, according to research ...
Jan 16, 2012 |
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Healthy eating may help ADHD kids: US study
Simply eating healthier may improve the behavior of children with attention deficit hyperactivity disorder if therapy and medication fail, said a study published Monday in the journal Pediatrics.
Medicine & Health / Psychology & Psychiatry
Jan 09, 2012 |
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New dye will lead to more efficient solar energy technology
(PhysOrg.com) -- A North Carolina State University invention has significant potential to improve the efficiency of solar cells and other technologies that derive energy from light.
Nanotechnology / Nanomaterials
Dec 13, 2011 |
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Medical dye is good news for frogs
A readily available medical dye could become an key tool in amphibian conservation and management and the research is soon to be published in the Herpetological Journal.
Dec 08, 2011 |
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Many chemicals unproven to raise breast cancer risk
Women who want to reduce their risk of breast cancer may have heard they should avoid exposure to industrial chemicals but scientific evidence has so far not proven a direct link, said a US group Wednesday.
Dec 07, 2011 |
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Report: We control many breast cancer risk factors
Women concerned about breast cancer should worry less about cellphones and hair dyes and worry more about weighing or drinking too much, exercising too little, using menopause hormones and getting too much ...
Dec 07, 2011 |
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Microscopic cells race to victory in first World Cell Race at ASCB meeting
A "team" of fast-moving, bone marrow stem cells from a research laboratory in Singapore has run away with the first World Cell Race, finishing first with a cellular speed record of 5.2 microns per minute (or 0.000204 inches ...
Dec 03, 2011 |
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A natural dye obtained from lichens may combat Alzheimer's disease
A red dye derived from lichens that has been used for centuries to color fabrics and food appears to reduce the abundance of small toxic protein aggregates in Alzheimer's disease. The dye, a compound called orcein, and a ...
Dec 02, 2011 |
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Researchers' new recipe cooks up better tissue 'phantoms'
The precise blending of tiny particles and multicolor dyes transforms gelatin into a realistic surrogate for human tissue. These tissue mimics, known as "phantoms," provide an accurate proving ground for new photoacoustic ...
Nov 30, 2011 |
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Light vortex: Circularly polarized luminescence from a stirred and gelled solution of dye
(PhysOrg.com) -- Simple stirring can influence light, according to a report presented in the journal Angewandte Chemie by Kunihiko Okano and co-workers. Dye molecules locked in a gel send out “helical” ...
Oct 26, 2011 |
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New method cleans up textile industry's most dangerous chemicals
Textile dying is one of the most environmentally hazardous aspects of the textile industry. During dying, harmful chemicals that are difficult to break down are released, all too often into rivers and agricultural land. However, ...
Sep 26, 2011 |
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Colorful eco-textiles thanks to nano-sized enzymes
To address the problems encountered by the traditional European dyes industry, scientists have developed a new and environmentally friendly way to produce dyes.
Nanotechnology / Bio & Medicine
Sep 15, 2011 |
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Research team achieves first 2-color STED microscopy of living cells
Researchers are able to achieve extremely high-resolution microscopy through a process known as stimulated emission depletion (STED) microscopy. This cutting-edge imaging system has pushed the performance of microscopes significantly ...
Aug 17, 2011 |
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Chemist contributes to development of novel method for recovering old fingerprints
A Northern Illinois University chemist is part of an international team of scientists whose work might someday crack open cold-case files.
Aug 03, 2011 |
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Dye
A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and requires a mordant to improve the fastness of the dye on the fiber.
Both dyes and pigments appear to be colored because they absorb some wavelengths of light more than others. In contrast with a dye, a pigment generally is insoluble, and has no affinity for the substrate. Some dyes can be precipitated with an inert salt to produce a lake pigment, and based on the salt used they could be aluminum lake, calcium lake or barium lake pigments.
Dyed flax fibers have been found in the Republic of Georgia dated back in a prehistoric cave to 36,000 BP. Archaeological evidence shows that, particularly in India and Phoenicia, dyeing has been widely carried out for over 5000 years. The dyes were obtained from animal, vegetable or mineral origin, with no or very little processing. By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale.
For more information about Dye, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
