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Mottle
Mottle is a pattern of irregular marks, spots, streaks, blotches or patches of different shades or colours. It is commonly used to describe the surface of plants or the skin of animals. In plants, mottling usually consists of yellowish spots on plants, and is usually a sign of disease or malnutrition. Many plant viruses cause mottling, some examples being: * Tobacco vein mottling virus * Bean pod mottle virus Mottling is sometimes used to describe uneven, discolored patches on the skin of humans as a result of cutaneous ischemia (lowered blood flow to the surfaces of the skin) or Herpes zoster infections. The medical term for mottled skin is dyschromia. Although this is not always the case, mottling can occur in the dying patient and commonly indicates that the end of life is near. Mottling usually occurs in the extremities (lower first) and progresses up as cardiac function declines and circulation throughout the body is poor. In animals, mottling may be a sign of disease, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bean Pod Mottle Virus
Bean pod mottle virus, or BPMV, is a species of plant pathogenic virus in the family '' Secoviridae''. It is known to infect soybean crops. Description BPMV is the viral pathogen that causes the disease Bean Pod Mottle in soybeans and other legumes such as snap peas. BPMV is a species in the plant pathogenic virus family '' Secoviridae'', and genus '' Comovirus''. It is characterized by icosahedral symmetry, non-enveloped, having two single stranded positive-sense RNAs (RNA-1 and RNA-2) separately encapsulated in isomeric particles, and are between 28 and 30 nm in diameter. (Bradshaw, 2007). The virus can overwinter in leaf-feeding beetle vectors (such as the bean leaf beetle), survive in perennial host species, and in virus-infected seed. In the North Central Region, the bean leaf beetle ('' Cerotoma trifurcata)'' is the most influential vector, by feeding on infected legumes and transferring virus particles to the next plant it lands on to feed. The BPMV disease has mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leopard Complex
The leopard complex is a group of genetically related Equine coat color, coat patterns in horses. These patterns range from progressive increases in interspersed white hair similar to Gray (horse), graying or Roan (horse), roan to distinctive, Dalmatian (dog), Dalmatian-like leopard (pattern), leopard spots on a white coat. Secondary characteristics associated with the leopard complex include a white sclera around the eye, striped horse hoof, hooves and mottling, mottled skin. The leopard complex gene is also linked to abnormalities in the eyes and vision. These patterns are most closely identified with the Appaloosa and Knabstrupper breeds, though its presence in breeds from Asia to western Europe has indicated that it is due to a very ancient mutation. Leopard complex patterns Coat patterns in the leopard complex range from being hardly distinguishable from an unaffected coat, to nearly pure white. Unlike most other Pinto horse, spotting patterns, the spotting and especially th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Champagne Gene
The champagne gene is a simple dominant allele responsible for a number of rare horse coat colors. The most distinctive traits of horses with the champagne gene are the hazel eyes and pinkish, freckled skin, which are bright blue and bright pink at birth, respectively. The coat color is also affected: any hairs that would have been red are gold, and any hairs that would have been black are chocolate brown. If a horse inherits the champagne gene from either or both parents, a coat that would otherwise be chestnut is instead gold champagne, with bay corresponding to amber champagne, seal brown to sable champagne, and black to classic champagne. A horse must have at least one champagne parent to inherit the champagne gene, for which there is now a DNA test. Unlike the genes underlying tobiano, dominant white, frame overo spotting and the Leopard complex common to the Appaloosa, the champagne gene does not affect the location of pigment-producing cells in the skin. Nor does the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Pathogens And Diseases
Plants are the eukaryotes that form the kingdom Plantae; they are predominantly photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with cyanobacteria to produce sugars from carbon dioxide and water, using the green pigment chlorophyll. Exceptions are parasitic plants that have lost the genes for chlorophyll and photosynthesis, and obtain their energy from other plants or fungi. Most plants are multicellular, except for some green algae. Historically, as in Aristotle's biology, the plant kingdom encompassed all living things that were not animals, and included algae and fungi. Definitions have narrowed since then; current definitions exclude fungi and some of the algae. By the definition used in this article, plants form the clade Viridiplantae (green plants), which consists of the green algae and the embryophytes or land plants ( hornworts, liverworts, mosses, lycophytes, ferns, conifers and other gymno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frog Skin
Frog skin, also known as duck hunter, is a camouflage pattern with mottle and disruptive coloration to blend into the environment. It is named for its similarity to a frog's crypsis skin. The frog skin pattern was the United States military's first attempt at disruptive coloration camouflage. History The US Army began experiments with camouflage in 1940–1941. The frog skin pattern was designed by Norvell Gillespie, a civilian horticulturist and the gardening editor for ''Better Homes & Gardens'' magazine, at the request of the US military. 150,000 uniforms in the pattern were ordered. In 1942, the Marine Raiders were the first issued a frog skin pattern uniform, which was reversible with a five-color jungle pattern on a green background on one side and a three-color beach pattern with a tan background on the other side. The pattern was made for the M1942 Reversible Spot Pattern and P42 Camo utility uniform based on the herringbone twill (HBT) cotton fabric. The unif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battledress
A combat uniform, also called a field uniform, battledress, or fatigues, is a casual wear, casual uniform used by military, police, firefighter, fire, and other public uniformed services for everyday fieldwork and duty, as opposed to dress uniforms for formal functions and parades. It generally consists of a jacket, trousers, and shirt or T-shirt, all cut to be looser and more comfortable than more formal uniforms. Combat uniform designs vary by regiment or service branch (e.g. army, navy, air force, marines, etc.). Uniform fabrics often come in Military camouflage, camouflage, disruptive patterns, or otherwise olive drab, brown, or khaki monochrome, to approximate the background and make the soldier less conspicuous in the field. In Western dress codes, field uniforms are considered equivalent to civilian casual wear, less formal than service dress uniforms, which are generally for office or staff use, as well as mess dress uniforms and full dress uniforms. Combat uniforms hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flecktarn
''Flecktarn'' (; "mottled camouflage"; also known as ''Flecktarnmuster'' or ''Fleckentarn'') is a family of three-, four-, five- or six-color disruptive camouflage patterns, the most common being the five-color pattern, consisting of dark green, grey-green, red brown, and black over a light green or tan base depending on the manufacturer. The original German five-color pattern was designed for use in European temperate woodland terrain. A three-color variation called Tropentarn (formerly Wüstentarn) is intended for arid and desert conditions; the German Bundeswehr wore it in Afghanistan. The original German five-color flecktarn has been adopted, copied and modified by many countries for their own camouflage patterns. History The Reichswehr, German Army started experimenting with camouflage patterns before World War II, and some army units used ''Splittermuster'' ("splinter pattern") camouflage, first issued in 1931. Waffen-SS combat units used various patterns from 1935 o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASTM
ASTM International, formerly known as American Society for Testing and Materials, is a standards organization that develops and publishes voluntary consensus technical international standards for a wide range of materials, products, systems and services. Some 12,575 apply globally. The headquarters is in West Conshohocken, Pennsylvania, about northwest of Philadelphia. It was founded in 1902 as the American Section of the International Association for Testing Materials. In addition to its traditional standards work, ASTM operates several global initiatives advancing additive manufacturing, advanced manufacturing, and emerging technologies, including the Additive Manufacturing Center of Excellence (AM CoE), the acquisition oWohlers Associatesfor market intelligence and advisory services, and the NIST-funded Standardization Center of Excellence (SCOE). History In 1898, a group of scientists and engineers, led by chemist, industry leader, and proponent of standardization Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bioturbation
Bioturbation is defined as the reworking of soils and sediments by animals or plants. It includes burrowing, ingestion, and defecation of sediment grains. Bioturbating activities have a profound effect on the environment and are thought to be a primary driver of biodiversity. The formal study of bioturbation began in the 1800s by Charles Darwin experimenting in his garden. The disruption of aquatic sediments and terrestrial soils through bioturbating activities provides significant ecosystem services. These include the alteration of nutrients in aquatic sediment and overlying water, shelter to other species in the form of burrows in terrestrial and water ecosystems, and soil production on land.Shaler, N. S., 1891, The origin and nature of soils, in Powell, J. W., ed., USGS 12th Annual report 1890–1891: Washington, D.C., Government Printing Office, p. 213-45. Bioturbators are deemed ecosystem engineers because they alter resource availability to other species through the physica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science), crystal forms of calcium carbonate . Limestone forms when these minerals Precipitation (chemistry), precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly Dolomite (rock), dolomite, a closely related rock, which contains a high percentage of the mineral Dolomite (mine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology. It is integrated with Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages. By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle the geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth. Geology provides evidence for plate tectonics, the ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
