Researchers at Masaryk University, Czech Republic, have innovated a technique to track bone development, growth dynamics and healing in a mouse model. In their paper, "Spatiotemporal monitoring of hard tissue development ...
In some patients, infection with the pandemic virus SARS-CoV-2 can trigger a dangerous immune response in hardened fatty deposits (plaques) lining the heart's largest blood vessels, a new study shows.
Sep 28, 2023
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A new technique designed to allow surgeons to identify and remove residual tumor tissue during breast-conserving surgery showed promising results in a multi-center trial led by investigators from the Mass General Cancer Center, ...
May 3, 2023
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Surgical tumor removal remains one of the most common procedures during cancer treatment, with about 45% of cancer patients undergoing this surgery at some point. Thanks to recent progress in imaging and biochemical technologies, ...
Mar 29, 2023
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Rice's Han Xiao, Stanford's Zhen Cheng and collaborators have developed a new tool for noninvasive brain imaging that can help illuminate hard-to-access structures and processes. Their small-molecule dye, or fluorophore, ...
Jan 17, 2023
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Long-term consumption of Allura Red food dye can be a potential trigger of inflammatory bowel diseases (IBDs), Crohn's disease and ulcerative colitis, says McMaster University's Waliul Khan. Researchers using experimental ...
Dec 20, 2022
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As a worldwide shortage of contrast dye for medical imaging continues, a new UC San Francisco research letter in JAMA quantified strategies medical facilities can employ to safely reduce dye use in computed tomography (CT) ...
Jun 10, 2022
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A Columbia Engineering team has developed a technology that could replace conventional biopsies and histology with real-time imaging within the living body. Described in a new paper published today in Nature Biomedical Engineering, ...
Mar 28, 2022
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You and your dentist have a lot of tools and techniques for stopping cavities, but detecting the specific chemical conditions that can lead to cavities and then preventing them from ever getting started is much harder. Now, ...
Mar 8, 2022
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92
Researchers from the University of Granada and the San Cecilio de Granada Teaching Hospital confirm that endocrine disruptors—chemical substances that may mimic or block the action of hormones—are present in some cosmetic ...
Apr 6, 2021
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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.
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