News tagged with pigmentation
(Medical Xpress)—Chickens likely raised with arsenic-based drugs result in chicken meat that has higher levels of inorganic arsenic, a known carcinogen, according to a new study led by researchers at theJohns Hopkins Center ...
Health May 13, 2013 | 5 / 5 (1) | 0
(HealthDay)—The red in redheads' hair is thought to put them at increased risk of the dangerous skin cancer melanoma, even if they don't spend a lot of time in the sun, according to a new study.
Cancer May 09, 2013 | not rated yet | 2 |
If a tumour has spread through the lymph nodes, the decision is often taken to exercise caution and remove extra tissue, to prevent it from spreading further. This often involves the removal of healthy lymph ...
Cancer Apr 18, 2013 | not rated yet | 0
(HealthDay)—Complications linked to tattoos and tattoo inks include allergic reactions, serious infections, and reactions that can be mistaken for skin cancer, according to information presented at the ...
Diseases, Conditions, Syndromes Mar 01, 2013 | not rated yet | 0
(Medical Xpress)—A possible link between colour vision and the development of myopia - or near-sightedness - has been discovered by an international group, including a researcher from The University of Western Australia.
Ophthalmology Mar 01, 2013 | not rated yet | 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 |
As people move more often and become more urbanized, skin color—an adaptation that took hundreds of thousands of years to develop in humans—may lose some of its evolutionary advantage, according to a Penn State anthropologist.
Health Feb 16, 2013 | 4 / 5 (1) | 2
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 |
(HealthDay)—It seems that tattoos are everywhere these days, but along with the increase in people getting inked, the number of Americans undergoing procedures to have a tattoo removed is also on the rise, ...
Health Feb 09, 2013 | not rated yet | 1
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 |
Researchers at the Hebrew University of Jerusalem, in collaboration with researchers at the Salk Institute in California, have found for the first time that a specific protein is essential not only for maintaining a healthy ...
Neuroscience Jan 07, 2013 | 5 / 5 (1) | 0
(Medical Xpress)—Researchers funded by Cancer Research UK have been looking at why new drugs called "MEK inhibitors", which are currently being tested in clinical trials, aren't as effective at killing cancer cells as they ...
Cancer Dec 19, 2012 | not rated yet | 0 |
(HealthDay)—Drinking two cups of milk a day gives toddlers adequate amounts of vitamin D without lowering their iron levels, according to new research.
Pediatrics Dec 17, 2012 | not rated yet | 0 |
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 |
(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 |
A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material 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 binder), a relatively neutral or colorless material that suspends the pigment and gives the paint its adhesion.
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. The global demand on pigments was roughly US$ 20.5 billion in 2009, around 1.5-2% up from the previous year. It is predicted to increase in a stable growth rate in the coming years. The worldwide sales will increase to US$ 24.5 billion in 2015, and reach US$ 27.5 billion in 2018.
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.
For more information about Pigment, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.