1.
Indigo dye
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Indigo dye is an organic compound with a distinctive blue color. Historically, indigo was a dye extracted from the leaves of certain plants. A large percentage of indigo dye produced today – several thousand each year – is synthetic. It is the blue often associated with blue jeans, the primary use for indigo is as a dye for cotton yarn, which is mainly for the production of denim cloth for blue jeans. On average, a pair of blue jean trousers requires 3–12 g of indigo, small amounts are used for dyeing wool and silk. Indigo carmine, or indigo, is a derivative which is also used as a colorant. About 20 thousand tons are produced annually, again mainly for blue jeans and it is also used as a food colorant, and is listed in the United States as FD&C Blue No.2. A variety of plants have provided indigo throughout history, but most natural indigo was obtained from those in the genus Indigofera, the primary commercial indigo species in Asia was true indigo. A common alternative used in the relatively colder subtropical locations such as Japans Ryukyu Islands, dyers knotweed was the most important blue dye in East Asia until the arrival of the Indigofera species from the south, which yield more dye. In Central and South America, the species grown is I. suffruticosa, in Europe woad containing the same dye was used for blue-dying. Several plants contain indigo, but low concentrations make them difficult to work with, natural sources also include mollusks, the Murex sea snails produce a mixture of indigo and dibromoindigo which together produce a range of purple hues known as Tyrian purple. Light exposure during part of the process can convert the dibromoindigo into indigo resulting in blue hues known as royal blue or hyacinth purple. The precursor to indigo is indican, a colorless, water-soluble derivative of the amino acid tryptophan, indican readily hydrolyzes to release β-D-glucose and indoxyl. Oxidation by exposure to air converts indoxyl to indigo, indican was obtained from the processing of the plants leaves, which contain as much as 0. 2–0. 8% of this compound. The leaves were soaked in water and fermented to convert the glycoside indican present in the plant to the blue dye indigotin, the precipitate from the fermented leaf solution was mixed with a strong base such as lye, pressed into cakes, dried, and powdered. The powder was mixed with various other substances to produce different shades of blue. Indigo was used in India, which was also the earliest major center for its production, the I. tinctoria species was domesticated in India. Indigo, used as a dye, made its way to the Greeks and the Romans, Indigo is among the oldest dyes to be used for textile dyeing and printing
2.
Conner Prairie
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Conner Prairie was founded by pharmaceutical executive Eli Lilly in the 1930s. Lilly also transferred about 1,400 acres of surrounding farmland to the college with the expectation that Earlham would sell that land and use the proceeds to provide an endowment for the museum. Instead, Earlham elected to retain the farmland and expand the museum, constructing an 1836 village, Prairietown, the museum grew in scope and popularity. In 1992 Earlham created a wholly owned subsidiary to run the museum and appointed a volunteer board of directors. Beginning in 1999, tension began to develop between the board of directors and Earlham regarding the museums governance and the financial policies. The dispute culminated in Earlhams dismissal of the board of directors, Conner Prairie now has its own board of directors and maintains its own finances and endowment fund. In 2009 Conner Prairie became an affiliate in the Smithsonian Affiliations program, on December 17,2010, Conner Prairie was awarded the National Medal for Museum and Library Service and a $10,000 prize in a ceremony at the White House. The living museum opened its newest exhibit in June 2011, the 1863 Civil War Journey, Raid on Indiana documents Morgans Raid with live action, video, and interactive activities. The museum grounds are divided into sections, where different eras in history are recreated to create a kind of living timeline. Staff in historical clothing demonstrate the way early inhabitants in the area lived and they explain their lifestyles in character while performing chores such as cooking, chopping wood, making pottery, and tending to animals. Patrons are often invited to join in the activities, the museums main building, called the Welcome Center, contains the entrance lobby, ticket sales counter, Create. Connect, Discovery Station/Craft Corner indoor play area, banquet hall, and gift shop. The gift shop sells pottery made by the museums costumed staff as well as more conventional souvenirs and it also hosts American Civil War reenactments, Hearthside Suppers, and Christmas holiday events and dinners. Built in 1823, the William Conner House is a two-story Federal style brick house on the edge of the West Fork of the White River. The house is believed to be one of the first brick built in central Indiana. Seven of William and Elizabeth Conners 10 children were born in the home, Conners house was used as the meeting place for the County Commissioners, Circuit Court, and served as a post office in the early days of Hamilton County. Although Conner lived in the house until only 1837, his sons, in the 1860s, Conners Delaware children he had with Mekinges Conner unsuccessfully attempted to gain title to the land. The house continued to be used as a residence by various owners until 1935, when Conners house was purchased by Eli Lilly, Lilly restored the house and turned it into a museum. In 1980, the William Conner House was listed in the National Register of Historic Places, the genuine Conner brick house and barn are preserved as a museum
3.
Open-air museum
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An open-air museum is a museum that exhibits collections of buildings and artifacts out-of-doors. They are also known as museums of buildings or folk museums. The concept of an open-air museum originated in Scandinavia in the late 19th century, a comprehensive history of the open-air museum as idea and institution can be found in Swedish museologist Sten Rentzhogs 2007 book Open Air Museums, The History and Future of a Visionary Idea. Living history museums, including living farm museums and living museums, the interpreters act as if they are living in a different time and place and perform everyday household tasks, crafts, and occupations. The goal is to demonstrate older lifestyles and pursuits to modern audiences, household tasks might include cooking on an open hearth, churning butter, spinning wool and weaving, and farming without modern equipment. They may therefore be described as building museums, European open-air museums tended to be originally in regions where wooden architecture prevailed, as wooden structures may be trans-located without substantial loss of authenticity. Common to all museums, including the earliest ones of the 19th century, is the teaching of the history of everyday living by people from all segments of society. The idea of the museum dates to the 1790s. The first proponent of the idea was the Swiss thinker Charles de Bonstetten and was based on a visit to an exhibit of peasant costumes in the park of Frederiksborg Castle in Denmark. He believed that traditional peasant houses should be preserved against modernity, the first major steps towards the creation of open-air museums was taken in Norway in 1867 when a private citizen transferred some historic farm buildings to a site near Oslo for public viewing. This, in turn, inspired King Oscar II, to establish his own collection nearby, the similar Nordic Museum, was founded in Stockholm, Sweden soon afterwards. In 1891, the first major open-air museum was founded at Skansen, near Stockholm, the Skansen museum included farm buildings from across Scandinavia, folk costumes, live animals, folk music, and demonstrations of folk crafts. The success of Skansen ensured that the museum idea spread to countries across the world. Most open-air museums concentrate on rural culture, however, since the opening of the first town museum, The Old Town in Aarhus, Denmark in 1914, town culture has also become a scope of open-air museums. In many cases new town quarters are being constructed in existing rural culture museums, the North American open-air museum, more commonly called a living history museum, had a different, slightly later origin than the European, and the visitor experience is different. The first was Henry Fords Greenfield Village in Dearborn, Michigan, but it was Colonial Williamsburg which had a greater influence on museum development in North America. It influenced such projects through the continent as Mystic Seaport, Plimoth Plantation, what tends to differentiate the North American from the European model is the approach to interpretation. In Europe, the tendency is to focus on the buildings
4.
Color
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Color or colour is the characteristic of human visual perception described through color categories, with names such as red, yellow, purple, or blue. This perception of color derives from the stimulation of cells in the human eye by electromagnetic radiation in the spectrum of light. Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them and this reflection is governed by the objects physical properties such as light absorption, emission spectra, etc. By defining a color space, colors can be identified numerically by coordinates, there may also be more than three color dimensions in other color spaces, such as in the CMYK color model, wherein one of the dimensions relates to a colours colorfulness). The photo-receptivity of the eyes of species also varies considerably from our own. Honeybees and bumblebees for instance have trichromatic color vision sensitive to ultraviolet but is insensitive to red, papilio butterflies possess six types of photoreceptors and may have pentachromatic vision. The most complex color vision system in the kingdom has been found in stomatopods with up to 12 spectral receptor types thought to work as multiple dichromatic units. The science of color is sometimes called chromatics, colorimetry, or simply color science and it includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range. Electromagnetic radiation is characterized by its wavelength and its intensity, when the wavelength is within the visible spectrum, it is known as visible light. Most light sources emit light at different wavelengths, a sources spectrum is a distribution giving its intensity at each wavelength. Although the spectrum of light arriving at the eye from a given direction determines the color sensation in that direction, in each such class the members are called metamers of the color in question. The table at right shows approximate frequencies and wavelengths for various pure spectral colors, the wavelengths listed are as measured in air or vacuum. A common list identifies six main bands, red, orange, yellow, green, blue, Newtons conception included a seventh color, indigo, between blue and violet. It is possible that what Newton referred to as blue is nearer to what today is known as cyan, the color of an object depends on both the physics of the object in its environment and the characteristics of the perceiving eye and brain. Some objects not only light, but also transmit light or emit light themselves. This effect is known as color constancy, opaque objects that do not reflect specularly have their color determined by which wavelengths of light they scatter strongly. If objects scatter all wavelengths with roughly equal strength, they appear white, if they absorb all wavelengths, they appear black. Opaque objects that reflect light of different wavelengths with different efficiencies look like mirrors tinted with colors determined by those differences
5.
Chemical affinity
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In chemical physics and physical chemistry, chemical affinity is the electronic property by which dissimilar chemical species are capable of forming chemical compounds. Chemical affinity can also refer to the tendency of an atom or compound to combine by chemical reaction with atoms or compounds of unlike composition, the idea of affinity is extremely old. Many attempts have been made at identifying its origins, the majority of such attempts, however, except in a general manner, end in futility since affinities lie at the basis of all magic, thereby pre-dating science. Physical chemistry, however, was one of the first branches of science to study, the name affinitas was first used in the sense of chemical relation by German philosopher Albertus Magnus near the year 1250. Later, those as Robert Boyle, John Mayow, Johann Glauber, Isaac Newton, the term affinity has been used figuratively since c.1600 in discussions of structural relationships in chemistry, philology, etc. and reference to natural attraction is from 1616. Chemical affinity, historically, has referred to the force that causes chemical reactions, as well as, more generally, and earlier, the ″tendency to combine″ of any pair of substances. The broad definition, used throughout history, is that chemical affinity is that whereby substances enter into or resist decomposition. Antoine Lavoisier, in his famed 1789 Traité Élémentaire de Chimie, refers to Bergman’s work, according to Prigogine, the term was introduced and developed by Théophile de Donder. Goethe used the concept in his novel Elective Affinities, the affinity concept was very closely linked to the visual representation of substances on a table. The first-ever affinity table, which was based on displacement reactions, was published in 1718 by the French chemist Étienne François Geoffroy, crucially, the table was the central graphic tool used to teach chemistry to students and its visual arrangement was often combined with other kinds diagrams. Joseph Black, for example, used the table in combination with chiastic, Affinity tables were used throughout Europe until the early 19th century when they were displaced by affinity concepts introduced by Claude Berthollet. In chemical physics and physical chemistry, chemical affinity is the property by which dissimilar chemical species are capable of forming chemical compounds. Chemical affinity can also refer to the tendency of an atom or compound to combine by chemical reaction with atoms or compounds of unlike composition, in modern terms, we relate affinity to the phenomenon whereby certain atoms or molecules have the tendency to aggregate or bond. In this antiquated context, chemical affinity is sometimes synonymous with the term magnetic attraction. Many writings, up until about 1925, also refer to a law of chemical affinity, ilya Prigogine summarized the concept of affinity, saying, All chemical reactions drive the system to a state of equilibrium in which the affinities of the reactions vanish. The present IUPAC definition is that affinity A is the partial derivative of Gibbs free energy G with respect to extent of reaction ξ at constant pressure and temperature. It follows that affinity is positive for spontaneous reactions, in 1923, the Belgian mathematician and physicist Théophile de Donder derived a relation between affinity and the Gibbs free energy of a chemical reaction. This definition is useful for quantifying the factors responsible both for the state of systems, and for changes of state of non-equilibrium systems
6.
Aqueous solution
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An aqueous solution is a solution in which the solvent is water. It is usually shown in chemical equations by appending to the relevant chemical formula, for example, a solution of table salt, or sodium chloride, in water would be represented as Na+ + Cl−. The word aqueous means pertaining to, related to, similar to, as water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry. Substances that are hydrophobic often do not dissolve well in water, an example of a hydrophilic substance is sodium chloride. Acids and bases are aqueous solutions, as part of their Arrhenius definitions, the ability of a substance to dissolve in water is determined by whether the substance can match or exceed the strong attractive forces that water molecules generate between themselves. If the substance lacks the ability to dissolve in water the molecules form a precipitate, reactions in aqueous solutions are usually metathesis reactions. Metathesis reactions are another term for double-displacement, that is, when a cation displaces to form a bond with the other anion. The cation bonded with the latter anion will dissociate and bond with the other anion, aqueous solutions that conduct electric current efficiently contain strong electrolytes, while ones that conduct poorly are considered to have weak electrolytes. Those strong electrolytes are substances that are ionized in water. Nonelectrolytes are substances that dissolve in water yet maintain their molecular integrity, examples include sugar, urea, glycerol, and methylsulfonylmethane. When writing the equations of reactions, it is essential to determine the precipitate. To determine the precipitate, one must consult a chart of solubility, soluble compounds are aqueous, while insoluble compounds are the precipitate. Remember that there may not always be a precipitate, when performing calculations regarding the reacting of one or more aqueous solutions, in general one must know the concentration, or molarity, of the aqueous solutions. Solution concentration is given in terms of the form of the prior to it dissolving. Metal ions in aqueous solution Solubility Dissociation Acid-base reaction theories Properties of water Zumdahl S.1997, 4th ed. Boston, Houghton Mifflin Company
7.
Mordant
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A mordant or dye fixative is a substance used to set dyes on fabrics or tissue sections by forming a coordination complex with the dye which then attaches to the fabric or tissue. It may be used for dyeing fabrics, or for intensifying stains in cell or tissue preparations, the term mordant comes from the present participle of French mordre, to bite. In the past, it was thought that a mordant helped the dye bite onto the fiber so that it would hold fast during washing, a mordant is often a polyvalent metal ion. The resulting coordination complex of dye and ion is colloidal and can be acidic or alkaline. Mordants include tannic acid, alum, urine, chrome alum, sodium chloride, iodine is often referred to as a mordant in Gram stains, but is in fact a trapping agent. The three methods used for mordanting are, Pre-mordanting, The substrate is treated with the mordant, meta-mordanting, The mordant is added in the dye bath itself. Post-mordanting, The dyed material is treated with a mordant, the type of mordant used changes the shade obtained after dyeing and also affects the fastness property of the dye. The stability of the mordant or dye lake or both, the formation of a stable dye lake means that the mordant can be added in the dye without risk of losing the dye properties. Dye results can also rely on the mordant chosen as the introduction of the mordant into the dye will have an effect on the final color. Each dye can have different reactions to each mordant, for example, cochineal scarlet, or Dutch scarlet as it came to be known, used cochineal along with a tin mordant to create a brilliant orange-hued red. Residual iron mordant can damage or fade fabric, producing dye rot, the dye lake is an insoluble molecule formed when the complex of dye and mordant are combined, which then attaches to the substrate. Mordants increase the fastness of the dye since the molecule is now bonded to the fibre. The term lake is derived from the term lac, the secretions of the Indian wood insect Laccifer lacca and this is the same insect from which shellac is obtained. The type of mordant used can change the colour of both the dye-plus-mordant solution and influence the shade of the final product, unlike cotton, wool is highly receptive toward mordants. Due to its amphoteric nature wool can absorb acids and bases with equal efficiency, when wool is treated with a metallic salt it hydrolyses the salt into an acidic and basic component. The basic component is absorbed at –COOH group and the component is removed during washing. Wool also has a tendency to absorb fine precipitates from solutions, like wool, silk is also amphoteric and can absorb both acids as well as bases. However, wool has thio groups from the amino acid
8.
Light
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Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to light, which is visible to the human eye and is responsible for the sense of sight. Visible light is defined as having wavelengths in the range of 400–700 nanometres, or 4.00 × 10−7 to 7.00 × 10−7 m. This wavelength means a range of roughly 430–750 terahertz. The main source of light on Earth is the Sun, sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the used by living things. Historically, another important source of light for humans has been fire, with the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence, for example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey. Visible light, as all types of electromagnetic radiation, is experimentally found to always move at this speed in a vacuum. In physics, the term sometimes refers to electromagnetic radiation of any wavelength. In this sense, gamma rays, X-rays, microwaves and radio waves are also light, like all types of light, visible light is emitted and absorbed in tiny packets called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality, the study of light, known as optics, is an important research area in modern physics. Generally, EM radiation, or EMR, is classified by wavelength into radio, microwave, infrared, the behavior of EMR depends on its wavelength. Higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths, when EMR interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum it carries. There exist animals that are sensitive to various types of infrared, infrared sensing in snakes depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation. EMR in this range causes molecular vibration and heating effects, which is how these animals detect it, above the range of visible light, ultraviolet light becomes invisible to humans, mostly because it is absorbed by the cornea below 360 nanometers and the internal lens below 400. Furthermore, the rods and cones located in the retina of the eye cannot detect the very short ultraviolet wavelengths and are in fact damaged by ultraviolet. Many animals with eyes that do not require lenses are able to detect ultraviolet, by quantum photon-absorption mechanisms, various sources define visible light as narrowly as 420 to 680 to as broadly as 380 to 800 nm
9.
Pigment
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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, many materials selectively absorb certain wavelengths of light. Materials that humans have chosen and developed for use as pigments usually have properties that make them ideal for coloring other materials. A pigment must have a high tinting strength relative to the materials it colors and it must be stable in solid form at ambient temperatures. For industrial applications, as well as in the arts, permanence, pigments that are not permanent are called fugitive. Fugitive pigments fade over time, or with exposure to light, pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food, and other materials. Most pigments used in manufacturing and the arts are dry colorants. This powder is added to a binder, a neutral or colorless material that suspends the pigment. A distinction is made between a pigment, which is insoluble in its vehicle, and a dye, which either is itself a liquid or is soluble in its vehicle. A colorant can act as either a pigment or a dye depending on the vehicle involved, 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, the term biological pigment is used for all colored substances independent of their solubility. In 2006, around 7.4 million tons of inorganic, organic, asia has the highest rate on a quantity basis followed by Europe and North America. By 2020, revenues will have risen to approx, 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 growth rate in the coming years. The worldwide sales are said to increase up to US$24.5 billion in 2015, pigments appear the colors they are because they selectively reflect and absorb certain wavelengths of visible light. White light is an equal mixture of the entire spectrum of visible light with a wavelength in a range from about 375 or 400 nanometers to about 760 or 780 nm. When this light encounters a pigment, parts of the spectrum are absorbed by the molecules or ions of the pigment, in organic pigments such as diazo or phthalocyanine compounds the light is absorbed by the conjugated systems of double bonds in the molecule. Some of the inorganic pigments such as vermilion or cadmium yellow absorb light by transferring an electron from the ion to the positive ion
10.
Precipitation (chemistry)
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Precipitation is the creation of a solid from a solution. When the reaction occurs in a solution, the solid formed is called the precipitate. The chemical that causes the solid to form is called the precipitant, without sufficient force of gravity to bring the solid particles together, the precipitate remains in suspension. After sedimentation, especially when using a centrifuge to press it into a compact mass, Precipitation can be used as a medium. The precipitate-free liquid remaining above the solid is called the supernate or supernatant, powders derived from precipitation have also historically been known as flowers. When the solid appears in the form of fibers which have been through chemical processing. Sometimes the formation of a precipitate indicates the occurrence of a chemical reaction, if silver nitrate solution is poured into a solution of sodium chloride, a chemical reaction occurs forming a white precipitate of silver chloride. When potassium iodide solution reacts with lead nitrate solution, a precipitate of lead iodide is formed. Precipitation may occur if the concentration of a compound exceeds its solubility, Precipitation may occur rapidly from a supersaturated solution. Precipitation in solids is routinely used to synthesize nanoclusters, an important stage of the precipitation process is the onset of nucleation. The creation of a solid particle includes the formation of an interface, which requires some energy based on the relative surface energy of the solid. If this energy is not available, and no suitable nucleation surface is available, Precipitation reactions can be used for making pigments, removing salts from water in water treatment, and in classical qualitative inorganic analysis. Precipitation is also useful to isolate the products of a reaction during workup, ideally, the product of the reaction is insoluble in the reaction solvent. Thus, it precipitates as it is formed, preferably forming pure crystals, an example of this would be the synthesis of porphyrins in refluxing propionic acid. Thereafter, the precipitate may easily be separated by filtration, decanting, an example would be the synthesis of chromic tetraphenylporphyrin chloride, water is added to the DMF reaction solution, and the product precipitates. Precipitation is also useful in purifying products, crude bmim-Cl is taken up in acetonitrile, and dropped into ethyl acetate, another important application of an antisolvent is in ethanol precipitation of DNA. In metallurgy, precipitation from a solution is also a useful way to strengthen alloys. An example of a reaction, Aqueous silver nitrate is added to a solution containing potassium chloride
11.
Salt (chemistry)
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In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral and these component ions can be inorganic, such as chloride, or organic, such as acetate, and can be monatomic, such as fluoride, or polyatomic, such as sulfate. There are several varieties of salts, salts that hydrolyze to produce hydroxide ions when dissolved in water are alkali salts, whilst those that hydrolyze to produce hydronium ions in water are acidic salts. Neutral salts are those salts that are neither acidic nor basic, zwitterions contain an anionic centre and a cationic centre in the same molecule, but are not considered to be salts. Examples of zwitterions include amino acids, many metabolites, peptides, usually, non-dissolved salts at standard conditions for temperature and pressure are solid, but there are exceptions. Molten salts and solutions containing dissolved salts are called electrolytes, as they are able to conduct electricity. As observed in the cytoplasm of cells, in blood, urine, plant saps and mineral waters, therefore, their salt content is given for the respective ions. Salts can appear to be clear and transparent, opaque, and even metallic, in many cases, the apparent opacity or transparency are only related to the difference in size of the individual monocrystals. Since light reflects from the boundaries, larger crystals tend to be transparent. The color of the salt is due to the electronic structure in the d-orbitals of transition elements or in the conjugated organic dye framework. Different salts can elicit all five basic tastes, e. g. salty, sweet, sour, bitter, and umami or savory. Salts of strong acids and strong bases are non-volatile and odorless and that slow, partial decomposition is usually accelerated by the presence of water, since hydrolysis is the other half of the reversible reaction equation of formation of weak salts. Many ionic compounds can be dissolved in water or other similar solvents, the exact combination of ions involved makes each compound have a unique solubility in any solvent. The solubility is dependent on how well each ion interacts with the solvent, for example, all salts of sodium, potassium and ammonium are soluble in water, as are all nitrates and many sulfates – barium sulfate, calcium sulfate and lead sulfate are examples of exceptions. However, ions that bind tightly to each other and form highly stable lattices are less soluble, for example, most carbonate salts are not soluble in water, such as lead carbonate and barium carbonate. Some soluble carbonate salts are, sodium carbonate, potassium carbonate, solid salts do not conduct electricity. Moreover, solutions of salts also conduct electricity, the name of a salt starts with the name of the cation followed by the name of the anion. Salts are often referred to only by the name of the cation or by the name of the anion. g
12.
Lake pigment
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A lake pigment is a pigment manufactured by precipitating a dye with an inert binder, or mordant, usually a metallic salt. Unlike vermilion, ultramarine, and other pigments made from ground minerals, manufacturers and suppliers to artists and industry frequently omit the lake designation in the name. Many lake pigments are fugitive because the involved are not lightfast. Red lakes were important in Renaissance and Baroque paintings, they were often used as translucent glazes to portray the colors of rich fabrics. This sense of lake is unconnected with lake meaning body of water and it has the same root as the word lacquer, and comes originally from the Hindi word lakh, through the Arabic word lakk and the Persian word lak. Many lake pigments are azo dyes and they characteristically have sulfonate and sometimes carboxylate substituents, which confer negative charge to the chromophore. The metallic salt or binder used must be inert and insoluble in the vehicle, the organic component of the dye determines which wavelengths are absorbed and reflected by the resulting precipitate. In ancient times chalk, white clay, and crushed bones were used as sources of the calcium salts. The salts that are used today include barium sulfate, calcium sulfate, aluminium hydroxide. Lake pigments have a history in decoration and the arts. Some have been produced for thousands of years and traded over long distances. The red lakes were important in the history of art, because they were translucent, they were often used in layers of glazes over a more opaque red to create a deep. They were very often used by Titian and other Venetian artists of the 16th century to depict fine draperies, indigo lake was originally produced from the leaves of woad, and was known in ancient Egypt. In the late Middle Ages, a fashion for woad as a textile dye led to overplanting, after trade routes opened to the east, indigo was imported from India as a substitute for woad, and the cultivation of woad became uneconomical in Europe. Today, the blue dye known as indigo once produced from woad. The dye and pigment are both fugitive, rose madder lake, originally from the root of the madder plant, is also known as alizarin crimson in its synthetic form. Since rose madder is fugitive when exposed to light, its use has largely superseded, even in synthetic form. Carmine lake was produced from the cochineal insect, native to Central
13.
Bartholomeus Anglicus
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Bartholomeus Anglicus was an early 13th-century scholastic scholar of Paris, a member of the Franciscan order. He was the author of the compendium De proprietatibus rerum, dated at 1240, bartholomew also held senior positions within the church and was appointed Bishop of Łuków although he was not consecrated to that position. Little is known of Bartholomews early life and he is believed to have been born around the turn of the 13th century to unknown parents. The first record of him was in 1224 in Paris as a teacher, the work De proprietatibus rerum was written at the school of Magdeburg in Saxonia and intended for the use of students and the general public. Bartholomew carefully notes the sources for the included, although, at present. His annotations give an idea of the wide variety of works available to a medieval scholar. The original Latin work was translated into French in 1372 and a number of manuscripts of the Latin, the work was later printed in numerous editions. John Trevisa produced an English translation in 1397, extracts were compiled by Robert Steele under the title Medieval Lore, an Epitome. A critical edition of Trevisas translation appeared in 1988, the work was organized in 19 books. Basil of Caesarea In Hexameron Bede, the work by which he was best known in the 13th century was not his History but the works on the Calendar, etc. Jean Beleth Bernard of Clairvaux Bestiarium, A collection of early myths on animals, there are many different forms of this work. Boethius treatise on arithmetic Callisthenes pseudo, Alexander romance Cassiodorus De Septem Disciplinis Cato the Elder, On Agriculture Calcidius, constantine the African He wrote the Viaticum and the Pantegna He introduced Arab medicine into Europe through the School of Salerno. A Syriac astrologer, afterwards Bishop of Antioch, and Martyr in the Diocletian persecution, a Syrian commentator on Aristotle, who took refuge in Persia. Author of a work on wonders quoted by Photius, pedanius Dioscorides Pseudo-Dionysius the Areopagite, De Coelesti Hierarchia, and de divinis nominibus Aelius Donatus Grammarian. Fabius Planciades Fulgentius or Fulgentius of Ruspe grammarian, gilbertus Anglicus An English physician in France, wrote COMPENDIUM MEDICINAE. Pope Gregory I Commentary on Job, HALY The first medical work translated by Constantius Afercanus HERMES. A jurisconsult and writer on Grammar, an Arab physician, who translated many Greek authors into Arabic. He wrote a work on Etymology in 20 books, one of the most popular works of the Middle Age, a Crusading Bishop, afterwards Cardinal legate
14.
Natural dye
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Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources—roots, berries, bark, leaves, archaeologists have found evidence of textile dyeing dating back to the Neolithic period. In China, dyeing with plants, barks and insects has been traced more than 5,000 years. The essential process of dyeing changed little over time, typically, the dye material is put in a pot of water and then the textiles to be dyed are added to the pot, which is heated and stirred until the color is transferred. Textile fibre may be dyed before spinning, but most textiles are yarn-dyed or piece-dyed after weaving, many mordants, and some dyes themselves, produce strong odors, and large-scale dyeworks were often isolated in their own districts. Plant-based dyes such as woad, indigo, saffron, and madder were raised commercially and were important trade goods in the economies of Asia, across Asia and Africa, patterned fabrics were produced using resist dyeing techniques to control the absorption of color in piece-dyed cloth. Dyes such as cochineal and logwood were brought to Europe by the Spanish treasure fleets, the discovery of man-made synthetic dyes in the mid-19th century triggered a long decline in the large-scale market for natural dyes. Natural dyeing techniques are preserved by artisans in traditional cultures around the world. In the early 21st century, the market for natural dyes in the industry is experiencing a resurgence. Western consumers have become concerned about the health and environmental impact of synthetic dyes in manufacturing. The European Union, for example, has encouraged Indonesian batik cloth producers to switch to natural dyes to improve their market in Europe. Protein fibres require vat, acid, or indirect/mordant dyes, that require a bonding agent, each synthetic fibre requires its own dyeing method, for example, nylon requires acid, disperse and pigment dyes, rayon acetate requires disperse dyes, and so on. The earliest surviving evidence of textile dyeing was found at the large Neolithic settlement at Çatalhöyük in southern Anatolia, polychrome or multicolored fabrics seem to have been developed in the 3rd or 2nd millennium BCE. Textiles with a warp and an ochre-yellow weft were discovered in Egyptian pyramids of the Sixth Dynasty. His contributions to refining the process and his theories on colour brought much praise by the well known poet. Some dyestuffs, such as indigo and lichens, will give good color when used alone, the majority of plant dyes, however, also require the use of a mordant, a chemical used to fix the color in the textile fibres. These dyes are called adjective dyes, by using different mordants, dyers can often obtain a variety of colors and shades from the same dye. Fibres or cloth may be pretreated with mordants, or the mordant may be incorporated in the dyebath, salt helps to fix or increase fastness of colors, vinegar improves reds and purples, and the ammonia in stale urine assists in the fermentation of indigo dyes
15.
Root
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In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. Roots can also be aerial or aerating, that is growing up above the ground or especially above water, furthermore, a stem normally occurring below ground is not exceptional either. Therefore, the root is best defined as the non-leaf, non-nodes bearing parts of the plants body, however, important internal structural differences between stems and roots exist. The fossil record of roots – or rather, infilled voids where roots rotted after death – spans back to the late Silurian and their identification is difficult, because casts and molds of roots are so similar in appearance to animal burrows. They can be discriminated using a range of features, the first root that comes from a plant is called the radicle. In response to the concentration of nutrients, roots also synthesise cytokinin, Roots often function in storage of food and nutrients. The roots of most vascular plant species enter into symbiosis with fungi to form mycorrhizae. In its simplest form, the root architecture refers to the spatial configuration of a plant’s root system. This system can be complex and is dependent upon multiple factors such as the species of the plant itself, the composition of the soil. The configuration of root systems serves to support the plant, compete with other plants. Roots grow to specific conditions, which, if changed, can impede a plants growth. For example, a system that has developed in dry soil may not be as efficient in flooded soil, yet plants are able to adapt to other changes in the environment. Root architecture plays the important role of providing a supply of nutrients and water as well as anchorage. The main terms used to classify the architecture of a system are, Branch magnitude. Root angle, the angle of a lateral root’s base around the parent root’s circumference, the angle of a lateral root from its parent root. Link radius, the diameter of a root, all components of the root architecture are regulated through a complex interaction between genetic responses and responses due to environmental stimuli. These developmental stimuli are categorised as intrinsic, the genetic and nutritional influences, or extrinsic, the main hormones and respective pathways responsible for root architecture development include, Auxin – Auxin promotes root initiation, root emergence and primary root elongation. Cytokinins – Cytokinins regulate root apical meristem size and promote lateral root elongation, gibberellins – Together with ethylene they promote crown primordia growth and elongation
16.
Berry
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In everyday language, a berry is a small, pulpy, and often edible fruit. Berries are usually juicy, rounded, brightly colored, sweet or sour, common examples are strawberries, raspberries, blueberries, and red- and blackcurrants. In Britain, soft fruit is a term for such fruits. The scientific usage of the term differs from common usage. In scientific terminology, a berry is a fruit produced from the ovary of a flower in which the outer layer of the ovary wall develops into an edible fleshy portion. The definition includes many fruits that are not commonly known as berries, such as grapes, tomatoes, cucumbers, eggplants, fruits excluded by the botanical definition include strawberries, raspberries, and blackberries, which are aggregate fruits. A plant bearing berries is said to be bacciferous or baccate, while many berries are edible, some are poisonous to humans, such as deadly nightshade and pokeweed. Others, such as the white mulberry, red mulberry, and elderberry, are poisonous when unripe, berries are eaten worldwide and often used in jams, preserves, cakes or pies. The berry industry varies from country to country as do types of cultivated or growing in the wild. Berries have been valuable as a source for humans since before the start of agriculture. They were a staple for early hunter-gatherers for thousands of years. In time, humans learned to store berries so that they could be used in the winter and they may be made into fruit preserves, and among Native Americans, mixed with meat and fats as pemmican. Berries also began to be cultivated in Europe and other countries, in Japan, between the 10th and 18th centuries, the term ichibigo referred to many berry crops. The most widely cultivated berry of modern times, however, is the strawberry, the strawberry was mentioned by ancient Romans, who thought it had medicinal properties, but it was then not a staple of agriculture. Woodland strawberries began to be grown in French gardens in the 14th century, the musky-flavored strawberry began to be grown in European gardens in the late 16th century. Later, the Virginia strawberry was grown in Europe and the United States, the most commonly consumed strawberry, the garden strawberry, is an accidental hybrid of the Virginia strawberry and a Chilean variety Fragaria chiloensis. Soon after, Antoine Nicolas Duchesne began to study the breeding of strawberries and made several discoveries crucial to the science of plant breeding, such as the sexual reproduction of strawberry. A form of the berry is found in all the Germanic languages, for example, Old English berie compares with Old Saxon and Old High German beri
17.
Bark (botany)
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Bark is the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines, and shrubs, Bark refers to all the tissues outside of the vascular cambium and is a nontechnical term. It overlays the wood and consists of the bark and the outer bark. The inner bark, which in older stems is living tissue, the outer bark in older stems includes the dead tissue on the surface of the stems, along with parts of the innermost periderm and all the tissues on the outer side of the periderm. The outer bark on trees which lies external to the last formed periderm is also called the rhytidome, Bark has been used to make cloth, canoes, and ropes and used as a surface for paintings and map making. A number of plants are grown for their attractive or interesting bark colorations. What is commonly called bark includes a number of different tissues, Cork is an external, secondary tissue that is impermeable to water and gases, and is also called the phellem. The cork is produced by the cork cambium which is a layer of active cells which serve as a lateral meristem for the periderm. The cork cambium, which is called the phellogen, is normally only one cell layer thick. The phelloderm, which is not always present in all barks, is a layer of cells formed by, together, the phellem, phellogen and phelloderm constitute the periderm. Cork cell walls contain suberin, a substance which protects the stem against water loss, the invasion of insects into the stem. The cambium tissues, i. e. Phloem is a nutrient-conducting tissue composed of sieve tubes or sieve cells mixed with parenchyma, the cortex is the primary tissue of stems and roots. In stems the cortex is between the layer and the phloem, in roots the inner layer is not phloem. From the outside to the inside of a woody stem. The bark includes through, and is composed of periderm and phloem, as the stem ages and grows, changes occur that transform the surface of the stem into the bark. The epidermis is a layer of cells that cover the plant body, including the stems, leaves, flowers and fruits, in old stems the epidermal layer, cortex, and primary phloem become separated from the inner tissues by thicker formations of cork. Due to the cork layer these cells die because they do not receive water. This dead layer is the rough corky bark that forms around tree trunks, often a secondary covering called the periderm forms on small woody stems and many non woody plants, which is composed of cork, the cork cambium, and the phelloderm
18.
Leaf
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A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot, Leaves are collectively referred to as foliage, as in autumn foliage. Although leaves can be seen in different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground. Most leaves have distinctive upper surface and lower surface that differ in colour, hairiness, broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as the clubmosses, with different evolutionary origins, some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls, furthermore, several kinds of leaf-like structures found in vascular plants are not totally homologous with them. Examples include flattened plant stems called phylloclades and cladodes, and flattened leaf stems called phyllodes which differ from both in their structure and origin. Many structures of plants, such as the phyllids of mosses and liverworts and even of some foliose lichens. Leaves are the most important organs of most vascular plants and these are then further processed by chemical synthesis into more complex organic molecules such as cellulose, the basic structural material in plant cell walls. The plant must therefore bring these three together in the leaf for photosynthesis to take place. Once sugar has been synthesized, it needs to be transported to areas of growth such as the plant shoots and roots. Vascular plants transport sucrose in a tissue called the phloem. The phloem and xylem are parallel to each other but the transport of materials is usually in opposite directions. Within the leaf these vascular systems branch to form veins which supply as much as the leaf as possible and they are arranged on the plant so as to expose their surfaces to light as efficiently as possible without shading each other, but there are many exceptions and complications. For instance plants adapted to windy conditions may have pendent leaves, such as in many willows, the flat, or laminar, shape also maximises thermal contact with the surrounding air, promoting cooling. Functionally, in addition to photosynthesis the leaf is the site of transpiration and guttation. Many gymnosperms have thin needle-like or scale-like leaves that can be advantageous in cold climates with frequent snow and these are interpreted as reduced from megaphyllous leaves of their Devonian ancestors. For xerophytes the major constraint is not light flux or intensity, some window plants such as Fenestraria species and some Haworthia species such as Haworthia tesselata and Haworthia truncata are examples of xerophytes. and Bulbine mesembryanthemoides
19.
Wood
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Wood is a porous and fibrous structural tissue found in the stems and roots of trees, and other woody plants. It is a material, a natural composite of cellulose fibers which are strong in tension embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, in a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots, Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. In 2005, the stock of forests worldwide was about 434 billion cubic meters. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy, in 1991 approximately 3.5 billion cubic meters of wood were harvested. Dominant uses were for furniture and building construction, a 2011 discovery in the Canadian province of New Brunswick discovered the earliest known plants to have grown wood, approximately 395 to 400 million years ago. Wood can be dated by carbon dating and in species by dendrochronology to make inferences about when a wooden object was created. People have used wood for millennia for many purposes, primarily as a fuel or as a material for making houses, tools, weapons, furniture, packaging, artworks. Constructions using wood date back ten thousand years, buildings like the European Neolithic long house were made primarily of wood. Recent use of wood has changed by the addition of steel. The year-to-year variation in tree-ring widths and isotopic abundances gives clues to the climate at that time. This process is known as growth, it is the result of cell division in the vascular cambium, a lateral meristem. These cells then go on to form thickened secondary cell walls, composed mainly of cellulose, hemicellulose, if the distinctiveness between seasons is annual, these growth rings are referred to as annual rings. Where there is little seasonal difference growth rings are likely to be indistinct or absent, if the bark of the tree has been removed in a particular area, the rings will likely be deformed as the plant overgrows the scar. It is usually lighter in color than that near the portion of the ring. The outer portion formed later in the season is known as the latewood or summerwood. However, there are differences, depending on the kind of wood
20.
Fungus
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A fungus is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants, a characteristic that places fungi in a different kingdom from plants, bacteria and some protists, is chitin in their cell walls. Similar to animals, fungi are heterotrophs, they acquire their food by absorbing dissolved molecules, growth is their means of mobility, except for spores, which may travel through the air or water. Fungi are the principal decomposers in ecological systems and this fungal group is distinct from the structurally similar myxomycetes and oomycetes. The discipline of biology devoted to the study of fungi is known as mycology, in the past, mycology was regarded as a branch of botany, although it is now known fungi are genetically more closely related to animals than to plants. Abundant worldwide, most fungi are inconspicuous because of the size of their structures. Fungi include symbionts of plants, animals, or other fungi and they may become noticeable when fruiting, either as mushrooms or as molds. Fungi perform a role in the decomposition of organic matter and have fundamental roles in nutrient cycling. Since the 1940s, fungi have been used for the production of antibiotics, Fungi are also used as biological pesticides to control weeds, plant diseases and insect pests. Many species produce bioactive compounds called mycotoxins, such as alkaloids and polyketides, the fruiting structures of a few species contain psychotropic compounds and are consumed recreationally or in traditional spiritual ceremonies. Fungi can break down manufactured materials and buildings, and become significant pathogens of humans, losses of crops due to fungal diseases or food spoilage can have a large impact on human food supplies and local economies. The fungus kingdom encompasses a diversity of taxa with varied ecologies, life cycle strategies. However, little is known of the biodiversity of Kingdom Fungi. Advances in molecular genetics have opened the way for DNA analysis to be incorporated into taxonomy, phylogenetic studies published in the last decade have helped reshape the classification within Kingdom Fungi, which is divided into one subkingdom, seven phyla, and ten subphyla. The English word fungus is directly adopted from the Latin fungus, used in the writings of Horace, a group of all the fungi present in a particular area or geographic region is known as mycobiota, e. g. the mycobiota of Ireland. Like plants, fungi grow in soil and, in the case of mushrooms, form conspicuous fruit bodies. The fungi are now considered a kingdom, distinct from both plants and animals, from which they appear to have diverged around one billion years ago. Fungi have membrane-bound cytoplasmic organelles such as mitochondria, sterol-containing membranes and they have a characteristic range of soluble carbohydrates and storage compounds, including sugar alcohols, disaccharides, and polysaccharides
21.
Lichen
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A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi in a symbiotic relationship. The combined lichen has properties different from those of its component organisms, Lichens come in many colours, sizes, and forms. The properties are sometimes plant-like, but lichens are not plants, Lichens may have tiny, leafless branches, flat leaf-like structures, flakes that lie on the surface like peeling paint, or other growth forms. A macrolichen is a lichen that is either bush-like or leafy, here, macro and micro do not refer to size, but to the growth form. Common names for lichens may contain the word moss, and lichens may superficially look like and grow with mosses, Lichens do not have roots that absorb water and nutrients as plants do, but like plants, they produce their own food by photosynthesis. When they grow on plants, they do not live as parasites, Lichens occur from sea level to high alpine elevations, in many environmental conditions, and can grow on almost any surface. Lichens are abundant growing on bark, leaves, mosses, on other lichens and they grow on rock, walls, gravestones, roofs, exposed soil surfaces, and in the soil as part of a biological soil crust. Different kinds of lichens have adapted to survive in some of the most extreme environments on Earth, arctic tundra, hot dry deserts, rocky coasts and they can even live inside solid rock, growing between the grains. It is estimated that 6% of Earths land surface is covered by lichen, there are about 20,000 known species of lichens. Some lichens have lost the ability to reproduce sexually, yet continue to speciate, Lichens may be long-lived, with some considered to be among the oldest living things. They are among the first living things to grow on fresh rock exposed after an event such as a landslide, the long life-span and slow and regular growth rate of some lichens can be used to date events. In American English, lichen is pronounced the same as the verb liken, in British English, both this pronunciation and one rhyming with kitchen /ˈlɪtʃən/) are used. Lichens grow in a range of shapes and forms. The shape of a lichen is determined by the organization of the fungal filaments. The nonreproductive tissues, or vegetative body parts, is called the thallus, Lichens are grouped by thallus type, since the thallus is usually the most visually prominent part of the lichen. Thallus growth forms typically correspond to a few basic internal structure types, Common names for lichens often come from a growth form or color that is typical of a lichen genus. When a crustose lichen gets old, the center may start to crack up like old-dried paint, old-broken asphalt paving and this is called being rimose or areolate, and the island pieces separated by the cracks are called areolas. The areolas appear separated, but are connected by an underlying prothallus or hypothallus, when a crustose lichen grows from a center and appears to radiate out, it is called crustose placodioid
22.
CD-R
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CD-R is a digital optical disc storage format. A CD-R disc is a disc that can be written once. CD-R disks are readable by most plain CD readers, i. e. CD readers manufactured prior to the introduction of CD-R and this is an advantage over CD-RW, which can be re-written but cannot be played on many plain CD readers. The CD-R, originally named CD Write-Once, specification was first published in 1988 by Philips, the Orange Book consists of several parts, furnishing details of the CD-WO, CD-MO, and CD-RW. The latest editions have abandoned the use of the term CD-WO in favor of CD-R, written CD-Rs and CD-RWs are, in the aspect of low-level encoding and data format, fully compatible with the audio CD and data CD standards. This means they use Eight-to-Fourteen Modulation, CIRC error correction, and, for CD-ROM, properly written CD-R discs on blanks of less than 80 minutes length are fully compatible with the audio CD and CD-ROM standards in all details including physical specifications. 80 minute CD-R discs marginally violate the Red Book physical format specifications, CD-RW discs have lower reflectivity than CD-R or pressed CDs and for this reason cannot meet the Red Book standard. Some hardware compatible with Red Book CDs may have difficulty reading CD-Rs and, because of their lower reflectivity, especially CD-RWs. To the extent that CD hardware can read extended-length discs or CD-RW discs, it is because that hardware has capability beyond the minimum required by the Red Book and Yellow Book standards. The dye materials developed by Taiyo Yuden made it possible for CD-R discs to be compatible with Audio CD, a standard CD-R is a 1.2 mm thick disc made of polycarbonate about 120 mm or 80 mm diameter. The 120 mm disc has a capacity of 74 minutes of audio or 650 Megabytes of data. Despite the foregoing, most CD-Rs on the market have an 80-minute capacity, there are also 90 minute/790 MiB and 99 minute/870 MiB discs, although they are less common. Also, due to the limitations of the structures in the ATIP,90 and 99 minute blanks will identify as 80 minute ones. Therefore, in order to use the capacity, these discs have to be burned using overburn options in the CD recording software. Nothing in the Red, Yellow or Orange Book standards prohibits disc reading/writing devices from having the capacity to read or write discs beyond the Compact Disc standards, the polycarbonate disc contains a spiral groove, called the pregroove, to guide the laser beam upon writing and reading information. The polycarbonate disc is coated on the side with a very thin layer of organic dye. Then, on top of the dye is coated a thin, reflecting layer of silver, finally, a protective coating of a photo-polymerizable lacquer is applied on top of the metal reflector and cured with UV-light. A blank CD-R is not empty, the pregroove has a wobble, maintaining a constant rate is essential to ensure proper size and spacing of the pits and lands burned into the dye layer
23.
Image sensor
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An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image. It does so by converting the variable attenuation of light waves into signals, the waves can be light or other electromagnetic radiation. As technology changes, digital imaging tends to replace analog imaging, early analog sensors for visible light were video camera tubes. Currently, used types are semiconductor charge-coupled devices or active pixel sensors in complementary metal–oxide–semiconductor or N-type metal-oxide-semiconductor technologies, analog sensors for invisible radiation tend to involve vacuum tubes of various kinds. Digital sensors include flat panel detectors, today, most digital cameras use a CMOS sensor, because CMOS sensors perform better than CCDs. An example is the fact that they incorporate an integrated circuit, CCD is still in use for cheap low entry cameras, but weak in burst mode. Both types of sensor accomplish the task of capturing light. Each cell of a CCD image sensor is an analog device, when light strikes the chip it is held as a small electrical charge in each photo sensor. This process is repeated until all the lines of pixels have had their charge amplified. A CMOS image sensor has an amplifier for each compared to the few amplifiers of a CCD. Some CMOS imaging sensors also use Back-side illumination to increase the number of photons that hit the photodiode, CMOS sensors can potentially be implemented with fewer components, use less power, and/or provide faster readout than CCD sensors. They are also vulnerable to static electricity discharges. Another approach is to utilize the very fine dimensions available in modern CMOS technology to implement a CCD like structure entirely in CMOS technology and this can be achieved by separating individual poly-silicon gates by a very small gap. These hybrid sensors are still in the phase and can potentially harness the benefits of both CCD and CMOS imagers. There are many parameters that can be used to evaluate the performance of a sensor, including dynamic range, signal-to-noise ratio. For sensors of comparable types, the ratio and dynamic range improve as the size increases. In order to avoid interpolated color information, techniques like color co-site sampling use a mechanism to shift the color sensor in pixel steps. 3CCD, using three discrete image sensors, with the color separation done by a dichroic prism, while in general digital cameras use a flat sensor, Sony prototyped a curved sensor in 2014 to reduce/eliminate Petzval field curvature that occurs with a flat sensor
24.
Color filter array
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In photography, a color filter array, or color filter mosaic, is a mosaic of tiny color filters placed over the pixel sensors of an image sensor to capture color information. Color filters are needed because the typical photosensors detect light intensity with little or no wavelength specificity, since sensors are made of semiconductors they obey solid-state physics. The color filters filter the light by wavelength range, such that the filtered intensities include information about the color of light. For example, the Bayer filter gives information about the intensity of light in red, green, the raw image data captured by the image sensor is then converted to a full-color image by a demosaicing algorithm which is tailored for each type of color filter. The spectral transmittance of the CFA elements along with the demosaicing algorithm jointly determine the color rendition, the sensors passband quantum efficiency and span of the CFAs spectral responses are typically wider than the visible spectrum, thus all visible colors can be distinguished. The responses of the filters do not generally correspond to the CIE color matching functions, so a translation is required to convert the tristimulus values into a common. The Foveon X3 sensor uses a different structure such that a pixel utilizes properties of multi-junctions to stack blue, green and this arrangement does not require a demosaicing algorithm because each pixel has information about each color. Dick Merrill of Foveon distinguishes the approaches as vertical color filter for the Foveon X3 versus lateral color filter for the CFA, sugiyama filed for a patent on such an arrangement in 2005. A CYGM matrix is a CFA that uses mostly secondary colors, other variants include CMY and CMYW matrices. Diazonaphthoquinone -novolac photoresist is one used as the carrier for making color filters from color dyes. There is some interference between the dyes and the light needed to properly expose the polymer, though solutions have been found for this problem. Color photoresists sometimes used include those with chemical monikers CMCR101R, CMCR101G, CMCR101B, CMCR106R, CMCR106G, a few sources discuss other specific chemical substances, attending optical properties, and optimal manufacturing processes of color filter arrays. For instance, Nakamura said that materials for on-chip color filter arrays fall into two categories, pigment and dye, pigment based CFAs have become the dominant option because they offer higher heat resistance and light resistance compared to dye based CFAs. In either case, thicknesses ranging up to 1 micrometre are readily available and he provides a bibliography focusing on the number, types, aliasing effects, moire patterns, and spatial frequencies of the absorptive filters. Theuwissen makes no mention of the materials utilized in CFA manufacture, at least one early example of an on-chip design utilized gelatin filters. The gelatin is sectionalized, via photolithography, and subsequently dyed, aoki reveals that a CYWG arrangement was used, with the G filter being an overlap of the Y and C filters. Adams et al. state Several factors influence the CFAs design, first, the individual CFA filters are usually layers of transmissive organic or pigment dyes. Ensuring that the dyes have the right mechanical properties—such as ease of application, durability and this makes it difficult, at best, to fine-tune the spectral responsivities
25.
Textile
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A textile or cloth is a flexible material consisting of a network of natural or artificial fibres. Yarn is produced by spinning raw fibres of wool, flax, cotton, hemp, Textiles are formed by weaving, knitting, crocheting, knotting, or felting. The words fabric and cloth are used in textile assembly trades as synonyms for textile, however, there are subtle differences in these terms in specialized usage. Textile refers to any material made of interlacing fibres, a fabric is a material made through weaving, knitting, spreading, crocheting, or bonding that may be used in production of further goods. Cloth may be used synonymously with fabric but is often a piece of fabric used for a specific purpose. The word textile is from Latin, from the adjective textilis, meaning woven, from textus, the word cloth derives from the Old English clað, meaning a cloth, woven or felted material to wrap around one, from Proto-Germanic kalithaz. The discovery of dyed flax fibres in a cave in the Republic of Georgia dated to 34,000 BCE suggests textile-like materials were made even in prehistoric times. The production of textiles is a craft whose speed and scale of production has been altered almost beyond recognition by industrialization, however, for the main types of textiles, plain weave, twill, or satin weave, there is little difference between the ancient and modern methods. Textiles have an assortment of uses, the most common of which are for clothing and for such as bags. In the household they are used in carpeting, upholstered furnishings, window shades, towels, coverings for tables, beds, and other flat surfaces, in the workplace they are used in industrial and scientific processes such as filtering. Textiles are used in traditional crafts such as sewing, quilting. Textiles for industrial purposes, and chosen for other than their appearance, are commonly referred to as technical textiles. Technical textiles include textile structures for applications, medical textiles, geotextiles, agrotextiles. In all these applications stringent performance requirements must be met, woven of threads coated with zinc oxide nanowires, laboratory fabric has been shown capable of self-powering nanosystems using vibrations created by everyday actions like wind or body movements. Fashion designers commonly rely on textile designs to set their fashion collections apart from others, armani, the late Gianni Versace, and Emilio Pucci can be easily recognized by their signature print driven designs. Textiles can be made from many materials and these materials come from four main sources, animal, plant, mineral, and synthetic. In the past, all textiles were made from natural fibres, including plant, animal, in the 20th century, these were supplemented by artificial fibres made from petroleum. Textiles are made in various strengths and degrees of durability, from the finest gossamer to the sturdiest canvas, microfibre refers to fibres made of strands thinner than one denier
26.
Neolithic
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It ended when metal tools became widespread. The Neolithic is a progression of behavioral and cultural characteristics and changes, including the use of wild and domestic crops, the beginning of the Neolithic culture is considered to be in the Levant about 10, 200–8800 BC. It developed directly from the Epipaleolithic Natufian culture in the region, whose people pioneered the use of wild cereals, which then evolved into true farming. The Natufian period was between 12,000 and 10,200 BC, and the so-called proto-Neolithic is now included in the Pre-Pottery Neolithic between 10,200 and 8800 BC. By 10, 200–8800 BC, farming communities arose in the Levant and spread to Asia Minor, North Africa, Mesopotamia is the site of the earliest developments of the Neolithic Revolution from around 10,000 BC. Early Neolithic farming was limited to a range of plants, both wild and domesticated, which included einkorn wheat, millet and spelt, and the keeping of dogs, sheep. By about 6900–6400 BC, it included domesticated cattle and pigs, the establishment of permanently or seasonally inhabited settlements, not all of these cultural elements characteristic of the Neolithic appeared everywhere in the same order, the earliest farming societies in the Near East did not use pottery. Early Japanese societies and other East Asian cultures used pottery before developing agriculture, unlike the Paleolithic, when more than one human species existed, only one human species reached the Neolithic. The term Neolithic derives from the Greek νέος néos, new and λίθος líthos, stone, the term was invented by Sir John Lubbock in 1865 as a refinement of the three-age system. In the Middle East, cultures identified as Neolithic began appearing in the 10th millennium BC, early development occurred in the Levant and from there spread eastwards and westwards. Neolithic cultures are attested in southeastern Anatolia and northern Mesopotamia by around 8000 BC. The total excavated area is more than 1,200 square yards, the Neolithic 1 period began roughly 10,000 years ago in the Levant. A temple area in southeastern Turkey at Göbekli Tepe dated around 9500 BC may be regarded as the beginning of the period. This site was developed by nomadic tribes, evidenced by the lack of permanent housing in the vicinity. At least seven stone circles, covering 25 acres, contain limestone pillars carved with animals, insects, Stone tools were used by perhaps as many as hundreds of people to create the pillars, which might have supported roofs. Other early PPNA sites dating to around 9500–9000 BC have been found in Jericho, Israel, Gilgal in the Jordan Valley, the start of Neolithic 1 overlaps the Tahunian and Heavy Neolithic periods to some degree. The major advance of Neolithic 1 was true farming, in the proto-Neolithic Natufian cultures, wild cereals were harvested, and perhaps early seed selection and re-seeding occurred. The grain was ground into flour, emmer wheat was domesticated, and animals were herded and domesticated
27.
Tyrian purple
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Tyrian purple, also known as Tyrian red, royal purple, imperial purple or imperial dye, is a bromine-containing reddish-purple natural dye. It is a produced by several species of predatory sea snails in the family Muricidae. In ancient times, extracting this dye involved tens of thousands of snails and substantial labor, Tyrian purple may first have been used by the ancient Phoenicians as early as 1570 BC. The dye was greatly prized in antiquity because the colour did not easily fade and its significance is such that the name Phoenicia means land of purple. It came in shades, the most prized being that of blackish clotted blood. Tyrian purple was expensive, the 4th-century-BC historian Theopompus reported, Purple for dyes fetched its weight in silver at Colophon in Asia Minor, the expense meant that purple-dyed textiles became status symbols, and early sumptuary laws restricted their uses. The production of Tyrian purple was tightly controlled in Byzantium and was subsidized by the imperial court, later a child born to a reigning emperor was said to be porphyrogenitos, born in the purple. Some speculate that the dye extracted from the Bolinus brandaris is known as argaman in Biblical Hebrew, another dye extracted from a related sea snail, Hexaplex trunculus, produced a blue colour which according to some is known as tekhelet, used in garments worn for ritual purposes. The dye substance is a secretion from the hypobranchial gland of one of several species of medium-sized predatory sea snails that are found in the eastern Mediterranean Sea. The dye is a compound of bromine, a class of compounds often found in algae and in some other sea life. In nature the snails use the secretion as part of their behaviour in order to sedate prey. The snail also secretes this substance when it is attacked by predators, therefore, the dye can be collected either by milking the snails, which is more labour-intensive but is a renewable resource, or by collecting and destructively crushing the snails. David Jacoby remarks that twelve thousand snails of Murex brandaris yield no more than 1.4 g of pure dye, the dog whelk Nucella lapillus, from the North Atlantic, can also be used to produce red-purple and violet dyes. The Phoenicians also made a dye, sometimes referred to as royal blue or hyacinth purple. The Phoenicians established a production facility on the Iles Purpuraires at Mogador. The sea snail harvested at this western Moroccan dye production facility was Hexaplex trunculus also known by the older name Murex trunculus and this second species of dye murex is found today on the Mediterranean and Atlantic coasts of Europe and Africa. The colour-fast dye was an item of trade, prized by Romans. Used as a dye, the shifts from blue to reddish-purple
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Kermes (dye)
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Kermes is a red dye derived from the dried bodies of the females of a scale insect in the genus Kermes, primarily Kermes vermilio. The Kermes insects are native in the Mediterranean region and live on the sap of the Kermes oak and they were used as a red dye by the ancient Greeks and Romans. The kermes dye is a rich red and it has good colour fastness in silk and wool. It was much esteemed in the era for dyeing silk. Post-medievally it was replaced by other red dyes and it is no longer in use today. Kermes dye is of ancient origin, jars of kermes have been found in a Neolithic cave-burial at Adaouste, in the Middle Ages, rich crimson and scarlet silks dyed with kermes in the new silk-weaving centers of Italy and Sicily exceeded the legendary Tyrian purple in status and desirability. The dyestuff was called grain in all Western European languages because the desiccated eggs resembled fine grains of wheat or sand, and textiles dyed with kermes were described as dyed in the grain. Following the Spanish conquest of the Aztec Empire, Mexican cochineal, alchermes Coccus The torah process of curing tzoraath, using tolaath shani תולעת שני, the Kermes dye Barber, E. J. W. Prehistoric Textiles. The Cambridge History of Western Textiles, netherton, Robin, and Gale R. Owen-Crocker, eds. CS1 maint, Uses editors parameter Schoeser, Mary
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Isatis tinctoria
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Isatis tinctoria, also called woad, dyers woad, or glastum, is a flowering plant in the family Brassicaceae. It is occasionally known as Asp of Jerusalem, Woad is also the name of a blue dye produced from the leaves of the plant. Woad is native to the steppe and desert zones of the Caucasus, Central Asia to eastern Siberia and Western Asia but is now found in southeastern and Central Europe. Long important as a source from which is obtained a blue dye, indigo, it has been cultivated throughout Europe, especially in Western and southern Europe, in medieval times there were important woad-growing regions in England, Germany and France. Towns such as Toulouse became prosperous from the woad trade, Woad was eventually replaced by the stronger Indigofera tinctoria and, in the early 20th century, both woad and Indigofera tinctoria were replaced by synthetic indigos. Used in traditional Chinese medicine for centuries, woad is now being studied for use in the treatment of cancer, there has also been some revival of the use of woad for craft purposes. The first archaeological finds of woad seeds date to the Neolithic, the seeds have been found in the French cave of lAudoste, Bouches-du-Rhône, France. Impressions of the seeds of Färberwaid or German indigo, of the plant family Brassicaceae, have found on pottery in the Iron Age settlement of the Heuneburg. Seed and pod fragments have also found in Iron Age pit at Dragonby, South Humberside. The Hallstatt burials of the Hochdorf Chieftains Grave and Hohmichele contained textiles dyed with woad dye, melo and Rondão write that woad was known as far back as the time of the ancient Egyptians, who used it to dye the cloth wrappings applied for the mummies. Skelton informs us that one of the early dyes discovered by the ancient Egyptians was blue woad, lucas writes, What has been assumed to have been Indian Indigo on ancient Egyptian fabrics may have been woad. Hall states that the ancient Egyptians created their blue dye by using indigotin, julius Caesar reported that the Britanni used to colour their bodies blue with vitrum, a word that roughly translates to glass, but has also been translated as woad. Carr suggests the translation of, dye themselves with glazes or infect themselves with glass, the latter could refer to using glass in the tattooing process or to scarification. It has also claimed that Caesar was referring to some form of copper- or iron-based pigment. Analysis done on the Lindow Man did return evidence of copper, the same study also noted that the earliest definite reference to the woad plant in the British Isles dates to a seed impression on an Anglo-Saxon pot. The authors theorized that vitrum could have referred to Copper sulfates naturally occurring variant Chalcanthite or to the mineral Azurite. A later study concluded the amount was not of sufficient magnitude to provide convincing evidence that the copper was applied as paint. In terms of usage, vitrum is more used to refer to glass rather than woad
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Rubia
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Rubia is a genus of flowering plants in the Rubiaceae family. It contains around 80 species of perennial scrambling or climbing herbs and subshrubs native to the Old World, the genus and its best-known species are commonly known as madder, e. g. Rubia tinctorum, Rubia peregrina, and Rubia cordifolia. Rubia was an important source of a red pigment in many regions of Asia, Europe. The genus name Rubia derives from the Latin ruber meaning red, the plants roots contain an anthracene compound called alizarin that gives its red colour to a textile dye known as Rose madder. It was also used as a colourant, especially for paint, the synthesis of alizarin greatly reduced demand for the natural compound. Cloth dyed with it has found on Egyptian mummies. It was the used for dyeing the cloaks of the Libyan women in the days of Herodotus. It is the erythrodanon of Pedanius Dioscorides, who wrote of its cultivation in Caria, and of Hippocrates, and the Rubia of Pliny. R. tinctorum was extensively cultivated in south Europe, France, where it is called garance, and the Netherlands, large quantities were imported into England from Smyrna, Trieste, Livorno, etc. The cultivation, however, decreased after alizarin was made artificially, Madder was employed medicinally in ancient civilizations and in the middle ages. Its most remarkable physiological effect was found to be that of colouring red the bones of animals fed upon it, as also the claws and this appears to be due to the chemical affinity of calcium phosphate for the colouring matter. This property was used to enable physiologists to ascertain the manner in which bones develop, Rubia in the World Checklist of Rubiaceae
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Resist dyeing
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Resist dyeing is a term for a number of traditional methods of dyeing textiles with patterns. Methods are used to resist or prevent the dye from reaching all the cloth, thereby creating a pattern, the most common forms use wax, some type of paste made from starch or mud, or a mechanical resist that manipulates the cloth such as tying or stitching. Another form of resist involves using an agent in a specific type of dye that will repel another type of dye printed over the top. The best-known varieties today include tie-dye and batik, wax or paste, melted wax or some form of paste is applied to cloth before being dipped in dye. Wherever the wax has seeped through the fabric, the dye will not penetrate, sometimes several colors are used, with a series of dyeing, drying and waxing steps. The wax may also be applied to another piece of cloth to make a stencil, which is placed over the cloth, and dye applied to the assembly. Paper stencils may also be used, another type of resist printing, the same method is used in art in printmaking, in one form of screenprinting. Mechanical, the cloth is tied, stitched, or clamped using clothespegs or wooden blocks to areas of the fabric. Chemical, a textile printing method, commonly achieved using two different classes of fiber reactive dyes, one of which must be of the vinyl sulfone type. A chemical-resisting agent is combined with dye Type A, and printed using the screenprint method, a second dye, Type B, is then printed overtop. The resist agent in Type A chemically prevents Type B from reacting with the fabric, resist dyeing has been very widely used in Eurasia and Africa since ancient times. The first discoveries of pieces of linen was from Egypt and date from the fourth century, cloth, used for mummy wrappings, was coated with wax, scratched with a sharp stylus, and dyed with a mixture of blood and ashes. After dyeing the cloth was washed in hot water to remove the wax, in Asia, this technique was practiced in China during the Tang dynasty, in India and Japan in the Nara period. In Africa it was practiced by the Yoruba tribe in Nigeria, Soninke. Indonesia and Malaysia - Ikat, where only the warp or weft is dyed, India Africa - Adire Modern West - Tie-dye Japan - Shibori Japan- Katagami and Bingata with stencils China - about 500 AD the jia xie method for dyeing using wood blocks was invented. An upper and a block is made, with carved out compartments opening to the back. The cloth, usually folded a number of times, is inserted and clamped between the two blocks, by unplugging the different compartments and filling them with dyes of different colours, a multi-coloured pattern can be printed over quite a large area of folded cloth. Ukraine, Russia and Poland - Pysanka, with wax for eggs at Easter Woodblock printing Byzantine dress
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New World
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The New World is one of the names used for the Earths Western Hemisphere, specifically the Americas. The term was coined by Florentine explorer Amerigo Vespucci, the Americas were also referred to as the fourth part of the world. New World are meaningful in historical context and for the purpose of distinguishing the worlds major ecozones, and to classify plant and animal species that originated therein. One can speak of the New World in a context, e. g. when discussing the voyages of Christopher Columbus. For lack of alternatives, the term is still useful to those discussing issues that concern the Americas. The term New World is used in a context, when one speaks of Old World. Biological taxonomists often attach the New World label to groups of species that are exclusively in the Americas, to distinguish them from their counterparts in the Old World. New World monkeys, New World vultures, New World warblers, the label is also often used in agriculture. Common Old World crops, and domesticated animals did not exist in the Americas until they were introduced by contact in the 1490s. Other famous New World crops include the cashew, cocoa, rubber, sunflower, tobacco, and vanilla, there are rare instances of overlap, e. g. In wine terminology, New World has a different definition, Vespucci was finally convinced when he proceeded on his mapping expedition through 1501-02, covering the huge stretch of coast of eastern Brazil. But this opinion is false, and entirely opposed to the truth, Vespuccis letter was a publishing sensation in Europe, immediately reprinted in several other countries. The Venetian explorer Alvise Cadamosto had used the term un altro mundo to refer to sub-Saharan Africa, however, this was merely a literary flourish, not a suggestion of a new fourth part of the world. Cadamosto was quite aware sub-Saharan Africa was firmly part of the African continent, the Italian-born Spanish chronicler Peter Martyr dAnghiera often shares credit with Vespucci for designating the Americas as a new world. Peter Martyr used the term Orbe Novo in the title of his history of the discovery of the Americas as a whole, a year later, Peter Martyr again refers to the marvels of the New Globe and the Western hemisphere. Christopher Columbus touched the continent of South America in his 1498 third voyage, in another letter, Columbus refers to having reached a new heavens and world and that he had placed another world under the dominion of the Kings of Spain. The Vespucci passage above applied the New World label to merely the continental landmass of South America, although the proceedings of the Toro-Burgos conferences are missing, it is almost certain that Vespucci articulated his recent New World thesis to his fellow navigators there. In English usage the term New World was problematic and only accepted relatively late, while it became generally accepted after Vespucci that Columbuss discoveries were not Asia but a New World, the geographic relationship between the two continents was still unclear
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Cochineal
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The cochineal is a scale insect in the suborder Sternorrhyncha, from which the natural dye carmine is derived. A primarily sessile parasite native to tropical and subtropical South America as well as Mexico and Arizona and these insects are found on the pads of prickly pear cacti, then are brushed off and dried. The insect produces carminic acid that deters predation by other insects, carminic acid, typically 17-24% of dried insects weight, can be extracted from the body and eggs, then mixed with aluminium or calcium salts to make carmine dye, also known as cochineal. Today, carmine is primarily used as a colorant in food, the carmine dye was used in Central America in the 15th century for coloring fabrics and became an important export good during the colonial period. After synthetic pigments and dyes such as alizarin were invented in the late 19th century, some towns in the Mexican state of Oaxaca are still working in handmade textiles using this cochineal. The primary biological distinctions between species are minor differences in host plant preferences, in addition to different geographic distributions. Cochineal is probably from French cochenille, Spanish cochinilla, Latin coccinus, meaning scarlet-colored, and Latin coccum, meaning berry yielding scarlet dye. See also the word kermes which is the source of a similar but weaker Mediterranean dye also called crimson. Some sources identify the Spanish source word for cochineal as cochinilla wood louse, Cochineal dye was used by the Aztec and Maya peoples of Central and North America. Eleven cities conquered by Montezuma in the 15th century paid a tribute of 2000 decorated cotton blankets and 40 bags of cochineal dye each. Production of cochineal is depicted in Codex Osuna, during the colonial period, the production of cochineal grew rapidly. Produced almost exclusively in Oaxaca by indigenous producers, cochineal became Mexicos second-most valued export after silver, soon after the Spanish conquest of the Aztec Empire, it began to be exported to Spain, and by the 17th century was a commodity traded as far away as India. The dyestuff was consumed throughout Europe and was so prized, its price was regularly quoted on the London. In 1777, French botanist Nicolas-Joseph Thiéry de Menonville, presenting himself as a physician, smuggled the insects. This particular collection failed to thrive and ultimately died out, leaving the Mexican monopoly intact, after the Mexican War of Independence in 1810–1821, the Mexican monopoly on cochineal came to an end. Large-scale production of cochineal emerged, especially in Guatemala and the Canary Islands, it was cultivated in Spain. The delicate manual labour required for the breeding of the insect could not compete with the methods of the new industry. The tuna blood dye stopped being used and trade in cochineal almost totally disappeared in the course of the 20th century, the breeding of the cochineal insect has been done mainly for the purposes of maintaining the tradition rather than to satisfy any sort of demand
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Haematoxylum campechianum
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It may also refer to members of the genus Xylosma, which is part of the willow family, Salicaceae. Haematoxylum campechianum is a species of flowering tree in the family, Fabaceae. The tree was of economic importance from the 17th century to the 19th century. The modern nation of Belize developed from 17th and 18th-century logging camps established by the English, the trees scientific name means bloodwood. Logwood was used for a time as a natural source of dye. It remains an important source of haematoxylin, which is used in histology for staining, the bark and leaves are also used in various medical applications. In its time, logwood was considered a versatile dye, and was used on textiles. The extract was used as a pH indicator. Brownish when neutral, it becomes yellow-reddish under acidic conditions and purple when alkaline, waynes Word, Logwood and Brazilwood, Trees That Spawned 2 Nations Media related to Haematoxylum campechianum at Wikimedia Commons Data related to Haematoxylum campechianum at Wikispecies
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Spain
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By population, Spain is the sixth largest in Europe and the fifth in the European Union. Spains capital and largest city is Madrid, other urban areas include Barcelona, Valencia, Seville, Bilbao. Modern humans first arrived in the Iberian Peninsula around 35,000 years ago, in the Middle Ages, the area was conquered by Germanic tribes and later by the Moors. Spain is a democracy organised in the form of a government under a constitutional monarchy. It is a power and a major developed country with the worlds fourteenth largest economy by nominal GDP. Jesús Luis Cunchillos argues that the root of the span is the Phoenician word spy. Therefore, i-spn-ya would mean the land where metals are forged, two 15th-century Spanish Jewish scholars, Don Isaac Abravanel and Solomon ibn Verga, gave an explanation now considered folkloric. Both men wrote in two different published works that the first Jews to reach Spain were brought by ship by Phiros who was confederate with the king of Babylon when he laid siege to Jerusalem. This man was a Grecian by birth, but who had given a kingdom in Spain. He became related by marriage to Espan, the nephew of king Heracles, Heracles later renounced his throne in preference for his native Greece, leaving his kingdom to his nephew, Espan, from whom the country of España took its name. Based upon their testimonies, this eponym would have already been in use in Spain by c.350 BCE, Iberia enters written records as a land populated largely by the Iberians, Basques and Celts. Early on its coastal areas were settled by Phoenicians who founded Western Europe´s most ancient cities Cadiz, Phoenician influence expanded as much of the Peninsula was eventually incorporated into the Carthaginian Empire, becoming a major theater of the Punic Wars against the expanding Roman Empire. After an arduous conquest, the peninsula came fully under Roman Rule, during the early Middle Ages it came under Germanic rule but later, much of it was conquered by Moorish invaders from North Africa. In a process took centuries, the small Christian kingdoms in the north gradually regained control of the peninsula. The last Moorish kingdom fell in the same year Columbus reached the Americas, a global empire began which saw Spain become the strongest kingdom in Europe, the leading world power for a century and a half, and the largest overseas empire for three centuries. Continued wars and other problems led to a diminished status. The Napoleonic invasions of Spain led to chaos, triggering independence movements that tore apart most of the empire, eventually democracy was peacefully restored in the form of a parliamentary constitutional monarchy. Spain joined the European Union, experiencing a renaissance and steady economic growth
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Flax
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Flax, Linum usitatissimum, is a member of the genus Linum in the family Linaceae. It is a food and fiber crop cultivated in regions of the world. The textiles made from flax are known in the Western countries as linen, and traditionally used for bed sheets, underclothes, the oil is known as linseed oil. In addition to referring to the plant itself, the word flax may refer to the fibers of the flax plant. The plant species is only as a cultivated plant, and appears to have been domesticated just once from the wild species Linum bienne. Several other species in the genus Linum are similar in appearance to L. usitatissimum, cultivated flax, including some that have similar blue flowers, some of these are perennial plants, unlike L. usitatissimum, which is an annual plant. Cultivated flax plants grow to 1.2 m tall, with slender stems, the leaves are glaucous green, slender lanceolate, 20–40 mm long, and 3 mm broad. The flowers are pale blue, 15–25 mm in diameter. The fruit is a round, dry capsule 5–9 mm in diameter, containing several brown seeds shaped like an apple pip. Flax was first domesticated in the Fertile Crescent region, evidence exists of a domesticated oilseed flax with increased seed size by 9,000 years ago from Tell Ramad in Syria. Use of the crop steadily spread, reaching as far as Switzerland, in China and India, domesticated flax was cultivated also by at least 5,000 years ago. Flax was extensively cultivated in ancient Egypt, where the walls had paintings of flowering flax. Egyptian priests only wore linen, as flax was considered a symbol of purity, phoenicians traded Egyptian linen throughout the Mediterranean, and the Romans used it for their sails. Eventually, Flanders became the center of the linen industry in the European Middle Ages. Since then, flax has lost its importance as a commercial crop, Flax is grown for its oil, used as a nutritional supplement, and as an ingredient in many wood-finishing products. Flax is also grown as a plant in gardens. Flax fibers are used to make linen, the Latin species name usitatissimum means most useful. Flax fibers are taken from the stem of the plant, and are two to three times as strong as those of cotton, additionally, flax fibers are naturally smooth and straight
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Georgia (country)
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Georgia is a country in the Caucasus region of Eurasia. The capital and largest city is Tbilisi, Georgia covers a territory of 69,700 square kilometres, and its 2016 population is about 3.72 million. Georgia is a unitary, semi-presidential republic, with the government elected through a representative democracy, during the classical era, several independent kingdoms became established in what is now Georgia. The kingdoms of Colchis and Iberia adopted Christianity in the early 4th century, a unified Kingdom of Georgia reached the peak of its political and economic strength during the reign of King David IV and Queen Tamar in the 12th and early 13th centuries. Thereafter the kingdom declined and eventually disintegrated under hegemony of various powers, including the Mongols, the Ottoman Empire. Russian rule over Georgia was eventually acknowledged in various treaties with Iran. Since the establishment of the modern Georgian republic in April 1991, post-communist Georgia suffered from civil, the countrys Western orientation soon led to the worsening of relations with Russia, culminating in the brief Russo-Georgian War in August 2008. Georgia is a member of the United Nations, the Council of Europe, and it contains two de facto independent regions, Abkhazia and South Ossetia, which gained limited international recognition after the 2008 Russo-Georgian War. Georgia and a part of the international community consider the regions to be part of Georgias sovereign territory under Russian military occupation. Georgia probably stems from the Persian designation of the Georgians – gurğān, in the 11th and 12th centuries adapted via Syriac gurz-ān/gurz-iyān, starting with the Persian word gurğ/gurğān, the word was later adopted in numerous other languages, including Slavic and West European languages. This term itself might have established through the ancient Iranian appellation of the near-Caspian region. The self-designation used by ethnic Georgians is Kartvelebi, the medieval Georgian Chronicles present an eponymous ancestor of the Kartvelians, Kartlos, a great-grandson of Japheth. However, scholars agree that the word is derived from the Karts, the name Sakartvelo consists of two parts. Its root, kartvel-i, specifies an inhabitant of the core central-eastern Georgian region of Kartli, ancient Greeks and Romans referred to early western Georgians as Colchians and eastern Georgians as Iberians. Today the full, official name of the country is Georgia, before the 1995 constitution came into force the countrys name was the Republic of Georgia. The territory of modern-day Georgia was inhabited by Homo erectus since the Paleolithic Era, the proto-Georgian tribes first appear in written history in the 12th century BC. The earliest evidence of wine to date has found in Georgia. In fact, early metallurgy started in Georgia during the 6th millennium BC, the classical period saw the rise of a number of early Georgian states, the principal of which was Colchis in the west and Iberia in the east
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Archaeology
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Archaeology, or archeology, is the study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, Archaeology can be considered both a social science and a branch of the humanities. In North America, archaeology is considered a sub-field of anthropology, archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology as a field is distinct from the discipline of palaeontology, Archaeology is particularly important for learning about prehistoric societies, for whom there may be no written records to study. Prehistory includes over 99% of the human past, from the Paleolithic until the advent of literacy in societies across the world, Archaeology has various goals, which range from understanding culture history to reconstructing past lifeways to documenting and explaining changes in human societies through time. The discipline involves surveying, excavation and eventually analysis of data collected to learn more about the past, in broad scope, archaeology relies on cross-disciplinary research. Archaeology developed out of antiquarianism in Europe during the 19th century, Archaeology has been used by nation-states to create particular visions of the past. Nonetheless, today, archaeologists face many problems, such as dealing with pseudoarchaeology, the looting of artifacts, a lack of public interest, the science of archaeology grew out of the older multi-disciplinary study known as antiquarianism. Antiquarians studied history with attention to ancient artifacts and manuscripts. Tentative steps towards the systematization of archaeology as a science took place during the Enlightenment era in Europe in the 17th and 18th centuries, in Europe, philosophical interest in the remains of Greco-Roman civilization and the rediscovery of classical culture began in the late Middle Age. Antiquarians, including John Leland and William Camden, conducted surveys of the English countryside, one of the first sites to undergo archaeological excavation was Stonehenge and other megalithic monuments in England. John Aubrey was a pioneer archaeologist who recorded numerous megalithic and other monuments in southern England. He was also ahead of his time in the analysis of his findings and he attempted to chart the chronological stylistic evolution of handwriting, medieval architecture, costume, and shield-shapes. Excavations were also carried out in the ancient towns of Pompeii and Herculaneum and these excavations began in 1748 in Pompeii, while in Herculaneum they began in 1738. The discovery of entire towns, complete with utensils and even human shapes, however, prior to the development of modern techniques, excavations tended to be haphazard, the importance of concepts such as stratification and context were overlooked. The father of archaeological excavation was William Cunnington and he undertook excavations in Wiltshire from around 1798, funded by Sir Richard Colt Hoare. Cunnington made meticulous recordings of neolithic and Bronze Age barrows, one of the major achievements of 19th century archaeology was the development of stratigraphy. The idea of overlapping strata tracing back to successive periods was borrowed from the new geological and paleontological work of scholars like William Smith, James Hutton, the application of stratigraphy to archaeology first took place with the excavations of prehistorical and Bronze Age sites
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India
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India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and it is bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast. It shares land borders with Pakistan to the west, China, Nepal, and Bhutan to the northeast, in the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives. Indias Andaman and Nicobar Islands share a border with Thailand. The Indian subcontinent was home to the urban Indus Valley Civilisation of the 3rd millennium BCE, in the following millennium, the oldest scriptures associated with Hinduism began to be composed. Social stratification, based on caste, emerged in the first millennium BCE, early political consolidations took place under the Maurya and Gupta empires, the later peninsular Middle Kingdoms influenced cultures as far as southeast Asia. In the medieval era, Judaism, Zoroastrianism, Christianity, and Islam arrived, much of the north fell to the Delhi sultanate, the south was united under the Vijayanagara Empire. The economy expanded in the 17th century in the Mughal empire, in the mid-18th century, the subcontinent came under British East India Company rule, and in the mid-19th under British crown rule. A nationalist movement emerged in the late 19th century, which later, under Mahatma Gandhi, was noted for nonviolent resistance, in 2015, the Indian economy was the worlds seventh largest by nominal GDP and third largest by purchasing power parity. Following market-based economic reforms in 1991, India became one of the major economies and is considered a newly industrialised country. However, it continues to face the challenges of poverty, corruption, malnutrition, a nuclear weapons state and regional power, it has the third largest standing army in the world and ranks sixth in military expenditure among nations. India is a constitutional republic governed under a parliamentary system. It is a pluralistic, multilingual and multi-ethnic society and is home to a diversity of wildlife in a variety of protected habitats. The name India is derived from Indus, which originates from the Old Persian word Hindu, the latter term stems from the Sanskrit word Sindhu, which was the historical local appellation for the Indus River. The ancient Greeks referred to the Indians as Indoi, which translates as The people of the Indus, the geographical term Bharat, which is recognised by the Constitution of India as an official name for the country, is used by many Indian languages in its variations. Scholars believe it to be named after the Vedic tribe of Bharatas in the second millennium B. C. E and it is also traditionally associated with the rule of the legendary emperor Bharata. Gaṇarājya is the Sanskrit/Hindi term for republic dating back to the ancient times, hindustan is a Persian name for India dating back to the 3rd century B. C. E. It was introduced into India by the Mughals and widely used since then and its meaning varied, referring to a region that encompassed northern India and Pakistan or India in its entirety
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Phoenicia
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The enterprising, sea-based Phoenician civilization spread across the Mediterranean between 1500 BC and 300 BC. Their civilization was organized in city-states, similar to those of Ancient Greece, perhaps the most notable of which were Tyre, Sidon, Arvad, Berytus and Carthage. Each city-state was an independent unit, and it is uncertain to what extent the Phoenicians viewed themselves as a single nationality. In terms of archaeology, language, lifestyle, and religion there was little to set the Phoenicians apart as markedly different from other Semitic Canaanites. The Phoenicians were the first state-level society to make use of alphabets. By their maritime trade, the Phoenicians spread the use of the alphabet to Anatolia, North Africa, and Europe, where it was adopted by the Greeks, the name Phoenicians, like Latin Poenī, comes from Greek Φοίνικες. The word φοῖνιξ phoînix meant variably Phoenician person, Tyrian purple, the word may be derived from φοινός phoinós blood red, itself possibly related to φόνος phónos murder. Beekes has suggested a Pre-Greek origin of the ethnonym, the oldest attested form of the word in Greek may be the Mycenaean po-ni-ki-jo, po-ni-ki, possibly borrowed from Ancient Egyptian fnḫw Asiatics, Semites, although this derivation is disputed. The folk-etymological association of Φοινίκη with φοῖνιξ mirrors that in Akkadian which tied kinaḫni, the land was natively known as knʿn and its people as the knʿny. In the Amarna tablets of the 14th century BC, people from the region called themselves Kenaani or Kinaani, the ethnonym survived in North Africa until the 4th century AD. Herodotus account refers to the myths of Io and Europa, according to the Persians best informed in history, the Phoenicians began the quarrel. The Greek historian Strabo believed that the Phoenicians originated from Bahrain, Herodotus also believed that the homeland of the Phoenicians was Bahrain. The people of Tyre in South Lebanon in particular have long maintained Persian Gulf origins, however, there is little evidence of occupation at all in Bahrain during the time when such migration had supposedly taken place. Canaanite culture apparently developed in situ from the earlier Ghassulian chalcolithic culture, Byblos is attested as an archaeological site from the Early Bronze Age. The Late Bronze Age state of Ugarit is considered quintessentially Canaanite archaeologically, fernand Braudel remarked in The Perspective of the World that Phoenicia was an early example of a world-economy surrounded by empires. The high point of Phoenician culture and sea power is usually placed c, archaeological evidence consistent with this understanding has been difficult to identify. A unique concentration in Phoenicia of silver hoards dated between 1200 and 800 BC, however, contains hacksilver with lead isotope ratios matching ores in Sardinia and Spain. This metallic evidence agrees with the memory of a western Mediterranean Tarshish that supplied Solomon with silver via Phoenicia
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Dyeing
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Dyeing is the process of adding color to textile products like fibers, yarns, and fabrics. Dyeing is normally done in a solution containing dyes and particular chemical material. After dyeing, dye molecules have uncut chemical bond with fiber molecules, the temperature and time controlling are two key factors in dyeing. There are mainly two classes of dye, natural and man-made, the primary source of dye, historically, has generally been nature, with the dyes being extracted from animals or plants. Since the mid-19th century, however, humans have produced artificial dyes to achieve a range of colors and to render the dyes more stable to resist washing. Different classes of dyes are used for different types of fiber and at different stages of the production process, from loose fibers through yarn. Acrylic fibers are dyed with basic dyes, while nylon and protein fibers such as wool and silk are dyed with acid dyes, cotton is dyed with a range of dye types, including vat dyes, and modern synthetic reactive and direct dyes. The word dye is from Middle English deie and from Old English dag, the first known use of the word dye was before the 12th century. The earliest dyed flax fibers have found in a prehistoric cave in the Republic of Georgia. In China, dyeing with plants, barks, and insects has been traced more than 5,000 years. Early evidence of dyeing comes from Sindh province in Pakistan, where a piece of cotton dyed with a dye was recovered from the archaeological site at Mohenjo-daro. The dye used in case was madder, which, along with other dyes such as indigo, was introduced to other regions through trade. The first synthetic dye was William Perkins mauveine in 1856, derived from coal tar, alizarin, the red dye present in madder, was the first natural pigment to be duplicated synthetically in 1869, a development which led to the collapse of the market for naturally grown madder. The development of new, strongly colored synthetic dyes followed quickly, dyes are applied to textile goods by dyeing from dye solutions and by printing from dye pastes. Methods include direct application and yarn dyeing and this renders the dye soluble so that it can be absorbed by the fiber since the insoluble dye has very little substantivity to the fiber. Direct dyes, a class of dyes largely for dyeing cotton, are water-soluble, most other classes of synthetic dye, other than vat and surface dyes, are also applied in this way. The term may also be applied to dyeing without the use of mordants to fix the dye once it is applied, mordants were often required to alter the hue and intensity of natural dyes and improve color fastness. Chromium salts were until recently used in dyeing wool with synthetic mordant dyes
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Animal
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Animals are multicellular, eukaryotic organisms of the kingdom Animalia. The animal kingdom emerged as a clade within Apoikozoa as the group to the choanoflagellates. Animals are motile, meaning they can move spontaneously and independently at some point in their lives and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs, they must ingest other organisms or their products for sustenance, most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago. Animals can be divided broadly into vertebrates and invertebrates, vertebrates have a backbone or spine, and amount to less than five percent of all described animal species. They include fish, amphibians, reptiles, birds and mammals, the remaining animals are the invertebrates, which lack a backbone. These include molluscs, arthropods, annelids, nematodes, flatworms, cnidarians, ctenophores, the study of animals is called zoology. The word animal comes from the Latin animalis, meaning having breath, the biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges, jellyfish, insects, and humans. Aristotle divided the world between animals and plants, and this was followed by Carl Linnaeus, in the first hierarchical classification. In Linnaeuss original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a single phylum, in 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms, Metazoa and Protozoa. The protozoa were later moved to the kingdom Protista, leaving only the metazoa, thus Metazoa is now considered a synonym of Animalia. Animals have several characteristics that set apart from other living things. Animals are eukaryotic and multicellular, which separates them from bacteria and they are heterotrophic, generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking cell walls. All animals are motile, if only at life stages. In most animals, embryos pass through a stage, which is a characteristic exclusive to animals. With a few exceptions, most notably the sponges and Placozoa and these include muscles, which are able to contract and control locomotion, and nerve tissues, which send and process signals
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Vegetable
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In everyday usage, a vegetable is any part of a plant that is consumed by humans as food as part of a meal. The term vegetable is somewhat arbitrary, and largely defined through culinary and it normally excludes other food derived from plants such as fruits, nuts, and cereal grains, but includes seeds such as pulses. The original meaning of the vegetable, still used in biology, was to describe all types of plant, as in the terms vegetable kingdom. At first, plants which grew locally would have been cultivated, nowadays, most vegetables are grown all over the world as climate permits, and crops may be cultivated in protected environments in less suitable locations. China is the largest producer of vegetables and global trade in agricultural products allows consumers to purchase vegetables grown in faraway countries, the scale of production varies from subsistence farmers supplying the needs of their family for food, to agribusinesses with vast acreages of single-product crops. Depending on the type of vegetable concerned, harvesting the crop is followed by grading, storing, processing, and marketing. Vegetables can be either raw or cooked and play an important role in human nutrition, being mostly low in fat and carbohydrates. Many nutritionists encourage people to consume plenty of fruit and vegetables, the word vegetable was first recorded in English in the early 15th century. It comes from Old French, and was applied to all plants. It derives from Medieval Latin vegetabilis growing, flourishing, a change from a Late Latin meaning to be enlivening, quickening. The meaning of vegetable as a plant grown for food was not established until the 18th century, in 1767, the word was specifically used to mean a plant cultivated for food, an edible herb or root. The year 1955 saw the first use of the shortened, slang term veggie, the broadest definition is the words use adjectivally to mean matter of plant origin to distinguish it from animal, meaning matter of animal origin. More specifically, a vegetable may be defined as any plant, part of which is used for food, a secondary meaning then being the edible part of such a plant. A more precise definition is any plant part consumed for food that is not a fruit or seed, falling outside these definitions are edible fungi and edible seaweed which, although not parts of plants, are often treated as vegetables. In everyday language, the fruit and vegetable are mutually exclusive. Fruit has a precise meaning, being a part that developed from the ovary of a flowering plant. This is considerably different from the words culinary meaning, while peaches, plums, and oranges are fruit in both senses, many items commonly called vegetables, such as eggplants, bell peppers, and tomatoes, are botanically fruits. The question of whether the tomato is a fruit or a vegetable found its way into the United States Supreme Court in 1893
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Mineral
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A mineral is a naturally occurring chemical compound, usually of crystalline form and abiogenic in origin. A mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids, the study of minerals is called mineralogy. There are over 5,300 known mineral species, over 5,070 of these have been approved by the International Mineralogical Association, the silicate minerals compose over 90% of the Earths crust. The diversity and abundance of species is controlled by the Earths chemistry. Silicon and oxygen constitute approximately 75% of the Earths crust, which translates directly into the predominance of silicate minerals, minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species, changes in the temperature, pressure, or bulk composition of a rock mass cause changes in its minerals. Minerals can be described by their various properties, which are related to their chemical structure. Common distinguishing characteristics include crystal structure and habit, hardness, lustre, diaphaneity, colour, streak, tenacity, cleavage, fracture, parting, more specific tests for describing minerals include magnetism, taste or smell, radioactivity and reaction to acid. Minerals are classified by key chemical constituents, the two dominant systems are the Dana classification and the Strunz classification, the silicate class of minerals is subdivided into six subclasses by the degree of polymerization in the chemical structure. All silicate minerals have a unit of a 4− silica tetrahedron—that is, a silicon cation coordinated by four oxygen anions. These tetrahedra can be polymerized to give the subclasses, orthosilicates, disilicates, cyclosilicates, inosilicates, phyllosilicates, other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates. The first criterion means that a mineral has to form by a natural process, stability at room temperature, in the simplest sense, is synonymous to the mineral being solid. More specifically, a compound has to be stable or metastable at 25 °C, modern advances have included extensive study of liquid crystals, which also extensively involve mineralogy. Minerals are chemical compounds, and as such they can be described by fixed or a variable formula, many mineral groups and species are composed of a solid solution, pure substances are not usually found because of contamination or chemical substitution. Finally, the requirement of an ordered atomic arrangement is usually synonymous with crystallinity, however, crystals are also periodic, an ordered atomic arrangement gives rise to a variety of macroscopic physical properties, such as crystal form, hardness, and cleavage. There have been recent proposals to amend the definition to consider biogenic or amorphous substances as minerals. The formal definition of an approved by the IMA in 1995, A mineral is an element or chemical compound that is normally crystalline. However, if geological processes were involved in the genesis of the compound, Mineral classification schemes and their definitions are evolving to match recent advances in mineral science
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Plant
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Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. The term is generally limited to the green plants, which form an unranked clade Viridiplantae. This includes the plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants have cell walls containing cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts and their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although reproduction is also common. There are about 300–315 thousand species of plants, of which the great majority, green plants provide most of the worlds molecular oxygen and are the basis of most of Earths ecologies, especially on land. Plants that produce grains, fruits and vegetables form humankinds basic foodstuffs, Plants play many roles in culture. They are used as ornaments and, until recently and in variety, they have served as the source of most medicines. The scientific study of plants is known as botany, a branch of biology, Plants are one of the two groups into which all living things were traditionally divided, the other is animals. The division goes back at least as far as Aristotle, who distinguished between plants, which generally do not move, and animals, which often are mobile to catch their food. Much later, when Linnaeus created the basis of the system of scientific classification. Since then, it has become clear that the plant kingdom as originally defined included several unrelated groups, however, these organisms are still often considered plants, particularly in popular contexts. When the name Plantae or plant is applied to a group of organisms or taxon. The evolutionary history of plants is not yet settled. Those which have been called plants are in bold, the way in which the groups of green algae are combined and named varies considerably between authors. Algae comprise several different groups of organisms which produce energy through photosynthesis, most conspicuous among the algae are the seaweeds, multicellular algae that may roughly resemble land plants, but are classified among the brown, red and green algae. Each of these groups also includes various microscopic and single-celled organisms
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Mauveine
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Mauveine, also known as aniline purple and Perkins mauve, was the first synthetic organic chemical dye, discovered serendipitously in 1856. It is also among the first chemical dyes to have been mass-produced, mauveine is a mixture of four related aromatic compounds differing in number and placement of methyl groups. Its organic synthesis involves dissolving aniline, p-toluidine, and o-toluidine in sulfuric acid and water in a roughly 1,1,2 ratio, mauveine A incorporates 2 molecules of aniline, one of p-toluidine, and one of o-toluidine. Mauveine B incorporates one molecule each of aniline, p-toluidine, in 1879, Perkin showed mauveine B related to safranines by oxidative/reductive loss of the p-tolyl group. In fact, safranine is a 2, 8-dimethyl phenazinium salt, whereas the produced by Perkin is presumed to be the 1. The molecular structure of mauveine proved difficult to determine, finally being identified in 1994. In 2007, two more were isolated and identified, mauveine B2, an isomer of mauveine B with methyl on different aryl group, and mauveine C, in 2008, additional mauveines and pseudomauveines were discovered, bringing the total number of these compounds up to 12. In 1856, William Henry Perkin, then age 18, was given a challenge by his professor, August Wilhelm von Hofmann, in one attempt, Perkin oxidized aniline using potassium dichromate, whose toluidine impurities reacted with the aniline and yielded a black solid—suggesting a failed organic synthesis. Cleaning the flask with alcohol, Perkin noticed purple portions of the solution, suitable as a dye of silk and other textiles, it was patented by Perkin, who the next year opened a dyeworks mass-producing it at Greenford on the banks of the Grand Union Canal in London. It was originally called aniline purple or Tyrian purple, the name of an ancient natural dye derived from mollusks, in 1859, it attained the name mauve in England via the French name for the mallow flower, and chemists later called it mauveine. By 1870, its great demand succumbed to newer synthetic colors in the dye industry launched by mauveine. In the early 20th century, the U. S. Perkin anniversary website Rotatable 3D models of mauveine are available using Jmol
