The old saying "the dose makes the poison" also holds true for ultraviolet (UV) light. While UV light is essential for vitamin D production, it is also important in phototherapy, several industrial processes, and plant growth. ...
Optics & Photonics
Jul 22, 2024
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A team of archaeologists affiliated with several institutions in Israel has tested a sample of red fabric found in a cave in Israel in 2016 and reports that it is from the Bronze Age. Their paper is published in Journal of ...
Researchers have developed a strategy to identify new antimicrobial drugs with therapeutic promise from bacterial datasets, providing clues for discovering alternatives to traditional antibiotics.
Cell & Microbiology
Jul 16, 2024
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Plankton—tiny organisms that are present in salt and freshwater—account for about half of the photosynthesis on the planet. But what scientists have assumed for many years to be plant plankton (phytoplankton) may actually ...
Environment
Jul 11, 2024
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A novel technique with potential applications for fields such as droplet chemistry and photochemistry has been demonstrated by an Osaka Metropolitan University-led research group.
Optics & Photonics
Jun 24, 2024
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The Greek island of Aegina was home to a Late Bronze Age purple dye workshop, according to a study published June 12, 2024 in the open-access journal PLOS ONE by Lydia Berger of Paris Lodron University of Salzburg, Austria ...
Archaeology
Jun 12, 2024
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183
Thousands of particles of light can merge into a type of "super photon" under suitable conditions. Physicists call such a state a photon Bose-Einstein condensate.
Optics & Photonics
Jun 7, 2024
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154
Researchers in Carnegie Mellon University's Department of Chemistry have developed a nucleic-acid-based photocatalyst that can precisely control atom transfer radical polymerization (ATRP), a popular method used to generate ...
Biochemistry
May 22, 2024
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62
A team of researchers has recently demonstrated the utility of employing a previously established screening system to probe the interactions between small molecules and RNA. Their study is published in Communications Chemistry.
Biochemistry
May 21, 2024
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Using waste to purify water may sound counterintuitive. But at TU Wien, this is exactly what has now been achieved. Researchers have developed a special nanostructure to filter a widespread class of harmful dyes from water.
Nanomaterials
Apr 24, 2024
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74
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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