News tagged with pigment
(Medical Xpress)—Scientists have until now not fully understood how animals see in color, since visual pigments in eyes contain exactly the same chromophore (light absorbing segment of the molecule) and yet can absorb different ...
Medical research Dec 07, 2012 | 4.6 / 5 (11) | 0 |
Eye color may be an indicator of whether a person is high-risk for certain serious skin conditions. A study, led by the University of Colorado School of Medicine, shows people with blue eyes are less likely to have vitiligo. ...
Genetics May 06, 2012 | 4.6 / 5 (10) | 0 |
Just like the old Crystal Gayle song, a new laser technology could soon allow you to turn those boring brown eyes of your to a rich and beautiful blue. But you better make sure that blue eyes are what you really want because ...
Other Nov 04, 2011 | 4 / 5 (11) | 21 |
Can eating grapes slow or help prevent the onset of age-related macular degeneration (AMD), a debilitating condition affecting millions of elderly people worldwide? Results from a new study published in Free Radical Biology an ...
Ophthalmology Jan 12, 2012 | 4.3 / 5 (8) | 1 |
Not just important for building strong bones, an international team of scientists has found that vitamin D also plays an essential role in the body's fight against infections such as tuberculosis.
Medical research Oct 12, 2011 | 4.6 / 5 (5) | 0 |
(Medical Xpress) -- Yale Cancer Center geneticists, biochemists, and structural biologists have painted the most comprehensive picture yet of the molecular landscape of melanoma, a highly aggressive and often ...
Genetics Jul 29, 2012 | 5 / 5 (4) | 0 |
For the first time, Wisconsin researchers have taken skin from patients and, using induced pluripotent stem cell (iPSC) technology, turned them into a laboratory model for an inherited type of macular degeneration.
Genetics Nov 08, 2012 | 5 / 5 (4) | 0 |
(PhysOrg.com) -- The U.S Department of Agriculture is warning residents in a variety of states to be on the lookout for the Heracleum Mantegazzianum, or giant hogweed. This plant in native to Central Asia ...
Ophthalmology Jul 11, 2011 | 4.8 / 5 (4) | 0 |
On rare occasion, the light-sensing photoreceptor cells in the eye misfire and signal to the brain as if they have captured photons, when in reality they haven't. For years this phenomenon remained a mystery. Reporting in ...
Neuroscience Jun 09, 2011 | 4.3 / 5 (4) | 3 |
A new study suggests that there is a significant correlation between excessive daytime sleepiness and vitamin D, and race plays an important factor.
Health Dec 14, 2012 | 4.3 / 5 (4) | 1 |
An international team of researchers has discovered the first DNA faults linked to melanoma - the deadliest skin cancer - that are not related to hair, skin or eye colour.
Genetics Oct 09, 2011 | 4.7 / 5 (3) | 0 |
Last year, a team of researchers at Brown University discovered that certain skin cells use a light-sensitive receptor found outside of the eye to sense ultraviolet light and quickly begin pumping out melanin ...
Medical research Jan 21, 2013 | 4.3 / 5 (3) | 0 |
(HealthDay) -- Skin cancer is more common among white people, but people with darker skin are also at risk, a dermatology expert cautions.
Cancer Jul 26, 2012 | 5 / 5 (2) | 0
Research led by Minghao Jin, PhD, Assistant Professor of Ophthalmology and Neuroscience at the LSU Health Sciences Center New Orleans Neuroscience Center of Excellence, has found a protein that protects retinal photoreceptor ...
Neuroscience Feb 12, 2013 | 5 / 5 (2) | 0 |
Loyola University Chicago Stritch School of Medicine researchers have developed a genetically modified protein that dramatically reverses the skin disorder vitiligo in mice, and has similar effects on immune ...
Medical research Feb 27, 2013 | 5 / 5 (2) | 0 |
A pigment is the material that changes the color of light it reflects as the result of selective color absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which the material itself emits light.
Many materials selectively absorb certain wavelengths of light. Materials that humans have chosen and developed for use as pigments usually have special properties that make them ideal for coloring other materials. A pigment must have a high tinting strength relative to the materials it colors. It must be stable in solid form at ambient temperatures.
For industrial applications, as well as in the arts, permanence and stability are desirable properties. Pigments that are not permanent are called fugitive. Fugitive pigments fade over time, or with exposure to light, while some eventually blacken.
Pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food and other materials. Most pigments used in manufacturing and the visual arts are dry colourants, usually ground into a fine powder. This powder is added to a vehicle (or matrix), a relatively neutral or colorless material that acts as a binder.
The worldwide market for inorganic, organic and special pigments had a total volume of around 7.4 million tons in 2006. Asia has the highest rate on a quantity basis followed by Europe and North America. In 2006, a turnover of 17.6 billion US$ (13 billion Euro) was reached mostly in Europe, followed by North America and Asia.
A distinction is usually made between a pigment, which is insoluble in the vehicle (resulting in a suspension), and a dye, which either is itself a liquid or is soluble in its vehicle (resulting in a solution). The term biological pigment is used for all colored substances independent of their solubility. A colorant can be both a pigment and a dye depending on the vehicle it is used in. In some cases, a pigment can be manufactured from a dye by precipitating a soluble dye with a metallic salt. The resulting pigment is called a lake pigment.
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This text uses material from Wikipedia and is available under the GNU Free Documentation License.