Definition: coloring matter (usually powder to be mixed with water or oil)
Definition: coloring matter (usually powder to be mixed with water or oil)
Sentences Containing 'pigment'
But in some of the most successful of these you will generally find spots of intensely dark pigment.
The lack of pigment in the skin and hair is caused by the absence of pigment-producing cells called melanocytes.
Instead, white-like coat colors result from various changes in the ways melanocytes produce pigment.
There are at least five known types of pigment dilution in horses, three which, as described below, can act to produce off-white phenotypes.
Dominant white in horses is caused by the absence of pigment cells (melanocytes), whereas albino animals have a normal distribution of melanocytes.
In other animals, patches of unpigmented skin, hair, or eyes due to the lack of pigment cells (melanocytes) are called piebaldism, not albinism nor partial albinism.
Eyes are pigmented at the front of the iris called the stroma, and in a thin layer at the back of the iris in tissue called the iris pigment epithelium.
The iris pigment epithelium prevents damaging light scattering within the eye.
Blue-eyed humans and mammals have little or no pigment in the stroma, but retain pigment in the iris pigment epithelium.
If pigment is missing from both the stroma and the iris pigment epithelium, the only pigment in the eye is the hemoglobin in blood vessels.
Albino mice lack pigment, but "...the inability of albino animals to produce pigment stems not from an absence of melanocytes...but from a deficiency and/or alteration of the structure of tyrosinase in melanocytes which are otherwise normal." This definition of albinism in mice - the inability to make tyrosinase - is extended to other mammals.
The retained pigment of dilute horses, like cremellos, is not comparable to the retained pigment of amelanistic "albino" birds and reptiles.
Head and neck are gray, throat and chin yellow, and the yellowish upper jaws are seldom marked with dark pigment.
The repositioning of these transposons (which coded for color) allowed other genes for pigment to be expressed.
It was named in recognition of Barry Holmes, a biologist. It is asaccharolytic, oxidase-negative and non-motile, producing a brown pigment.
Albinism is caused by a lack of melanin, which is a vital pigment that gives all creatures, including humans, their skin/ fur/ hair/ eye color.
Pigment increases rapidly and the half-grown parasite may have from 30 to 50 jet-black granules.
Large grains of malarial pigment are often seen in these parasites: more so than any other "Plasmodium" species, 8 merozoites.
Red ochre was widely as a pigment for wall paintings, particularly as the skin color of men.
During the Han Dynasty (200 BC to 200 AD) Chinese craftsmen made a red pigment, lead tetroxide, which they called "ch-ien tan", by heating lead white pigment.
Red lead or Lead tetroxide pigment was widely used as the red in Persian and Indian miniature paintings, and in European art, where it was called minium.
The Greeks began using red lead as a pigment.
The pigment used for many of the murals was called vermilion, and it came from the mineral cinnabar, a common ore of mercury.
The red wood was ground into sawdust and mixed with an alkaline solution to make dye and pigment.
Red lac, also called red lake, crimson lake or carmine lake, was an important red pigment in Renaissance and Baroque art.
It is characterized by high levels of the reddish pigment pheomelanin (which also accounts for the red color of the lips) and relatively low levels of the dark pigment eumelanin.
He is known for his unconventional technique, which involves using a brush made of his own hair and pigment from M's candy shells dissolved in water.
At long, the embryo appears pink because it lacks pigment except in its eyes, and its head and gill region are laterally enlarged and gelatinous.
The embryo gains pigment and sheds its fangs at a length of . Around this time, the mother stops producing ova.
Large colonies are observed along with a brown diffusible pigment within two to four days.
Other characteristics observed include anorexia, lethargic movement, and they may exhibit a darkened pigment.
A single mass of dark brown pigment develops and the schizonts arrange themselves in a double fan like configuration.
Pigment granules are scattered throughout the cytoplasm.
4 - 8 pigment grains occur in the cytoplasm usually at one end.
The color "amaranth" is similar to printer's magenta (pigment magenta) (but redder).
This color is a result of feather structure rather than pigment, and therefore can look gray in the shade.
Lycopene is also the main pigment in the closely related fungus "Clathrus archeri", while "beta"-carotene is the predominant pigment in the Phallaceae species "Mutinus caninus", "M. ravenelii", and "M. elegans".
Melanosomes are synthesised in the skin melanocytes, choroidal melanocytes and retinal pigment epithelial (RPE) cells in the eye, and in melanophores in lower vertebrates.
They are dependent for their pigment on a set of enzymes within the cell (especially tyrosinase) that synthesise the large polymers of melanin.
Before it contains much pigment (sufficient to be seen on light microscopy), it is known as a pre-melanosome.
Hematochrome is a yellow, orange, or (most commonly) red biological pigment present in some green algae, especially when exposed to intense light.
At this time, hogs cannot be successfully freeze branded, as their hair pigment cells are better protected.
Ochre is a natural pigment and associated color.
Umber is a natural brown or reddish-brown earth pigment that contains iron oxide and manganese oxide.
The name comes from "terra di ombra", or earth of Umbria, the Italian name of the pigment.
Umbria is a mountainous region in central Italy where the pigment was originally extracted.
Pigments containing the natural umber earths indicate them on the label as PBr7 (Pigment brown 7), following the Colour Index International system.
The Dutch artist Johannes Vermeer used umber to create shadows on whitewashed walls that were warmer and more harmonious than those created with black pigment.
Pigments containing the natural earths are labeled as PBr7, or Brown pigment 7.
Dr. Olson was recruited to work for the DuPont Company in Baltimore, MD, at the Krebs Pigment and Color plant as a chemist/physicist for work on the white pigment titanium dioxide.
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