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In the 18th century, purple was a color worn by royalty, aristocrats and other wealthy people. Good-quality purple fabric was too expensive for ordinary people. The first cobalt violet, the intensely red-violet cobalt arsenate, was highly toxic. Although it persisted in some paint lines into the 20th century, it was displaced by less toxic ...
Red-purple is the color that is called Rojo-Purpura (the Spanish word for "red-purple") in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.
Purple is a color similar in appearance to violet light. In the RYB color model historically used in the arts, purple is a secondary color created by combining red and blue pigments.
A nucleated red blood cell (NRBC), also known by several other names, is a red blood cell that contains a cell nucleus. Almost all vertebrate organisms have hemoglobin -containing cells in their blood, and with the exception of mammals , all of these red blood cells are nucleated. [ 1 ]
Artist's impression of Earth in the early Archean with a purplish hydrosphere and coastal regions Purple culture of Haloarchaea (left) and isolated purple and red membrane components (right) The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the ...
In the Munsell color system, this color at its maximum chroma of 12 is called Red-Purple, or more specifically Munsell 5RP. Artists' pigments and colored pencils labeled as purple are typically colored the red-violet color. On an RYB color wheel, the so-called red-violet color is the color between red and violet.
Flags of white, red and blue stripes (bands) are closely associated with independence and the French Revolution. It can often signal the relationships of some nations with other nations (for instance, the flag of the Netherlands and flags of its former colonies).
The loss of red blood cell elasticity is central to the pathophysiology of sickle cell disease. Normal red blood cells are quite elastic and have a biconcave disc shape, which allows the cells to deform to pass through capillaries. [75] In sickle cell disease, low oxygen tension promotes red blood cell sickling and repeated episodes of sickling ...
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