1.
Duck decoy (model)
–
A duck decoy is a man-made object resembling a real duck. Duck decoys are used in duck hunting to attract real ducks. Duck decoys were carved from wood, often Atlantic white cedar wood on the east coast from Maine to South Carolina. Modern ones may also be made of canvas and plastic and they are usually painted, often elaborately and very accurately, to resemble various kinds of waterfowl. Ever since Joel Barber, the first known decoy collector, started in 1918, barbers book Wild Fowl Decoys, was the first book on decoys as collectible objects. It was followed in 1965 by folk art dealer Adele Earnests The Art of the Decoy, william F. Mackey made many trips to Chincoteague Island for the great flounder fishing as well as hunting for Chincoteague decoys. On his trips to the island he called Snug Harbor Marina home and he would send out locals to search for great finds of Chincoteague history. Cigar Daisey was one of the local Chincoteaguers that would help Mackey find all the best decoys that made his collection world-famous, Cigar has told many stories of the many truck loads of decoys he rounded up for his good friend. By that time a milestone in collecting had already occurred with the publication of Decoy Collectors Guide, the Guide helped foster a sense of community and provided a forum for collectors to share their research. By the 1970s decoys were becoming big business, at least by previous standards, since the 1960s numerous collectors organizations have been created, specialist books and magazines published, with specialist dealers, and special interest shows around the US and Canada. Canadian decoys are still believed to be the sleepers in the world of decoy popularity and are often undervalued but are starting to gain recognition, the current world record price for an antique duck decoy at auction, red-breasted merganser hen by Lothrop Holmes for $856,000. Guyette & Deeter and Christies New York, the first million dollar price was achieved when two decoys by A. Elmer Crowell of East Harwich, MA were said to have sold for US$1.13 million each in a private sale, in September 2007. The record-setting decoys were sold in a collection of 31 decoys for $7.5 million in total so it remains for a single decoy to clearly break the $1 million mark. One of the most famous decoy makers in recent times is Delbert Cigar Daisey from Chincoteague Va, Cigar decoys are in high demand all over the country. The best decoy he ever made was a pintail that he made for his wife in 1973 and this decoy was featured in National Geographic in June 1980 on page 826. This decoy is estimated to be worth between $100,000 - $150,000, duck decoys were originally create by Leonard Gebralter in the 1730s. He started by applying different shapes of wood to create a duck shape, eventually he learned carving a single block was the most efficient way of creating a duck body. The most famous of all factory made decoys, operated in Detroit, Michigan, from 1896 to 1924
Duck decoy (model)
–
Black duck by Cigar Daisey
Duck decoy (model)
–
Goose by Bob Biddle
2.
Tool
–
A tool is any physical item that can be used to achieve a goal, especially if the item is not consumed in the process. Tool use by humans dates back millions of years, and other animals are known to employ simple tools. Tools that are used in fields or activities may have different designations such as instrument, utensil, implement, machine, device. The set of tools needed to achieve a goal is equipment, the knowledge of constructing, obtaining and using tools is technology. Anthropologists believe that the use of tools was an important step in the evolution of mankind, because tools are used extensively by both humans and wild chimpanzees, it is widely assumed that the first routine use of tools took place prior to the divergence between the two species. These early tools, however, were made of perishable materials such as sticks. Stone artifacts only date back to about 2.5 million years ago, however, a 2010 study suggests the hominin species Australopithecus afarensis ate meat by carving animal carcasses with stone implements. This finding pushes back the earliest known use of tools among hominins to about 3.4 million years ago. Finds of actual tools date back at least 2.6 million years in Ethiopia, one of the earliest distinguishable stone tool forms is the hand axe. Up until recently, weapons found in digs were the tools of “early man” that were studied. Now, more tools are recognized as culturally and historically relevant, as well as hunting, other activities required tools such as preparing food, “…nutting, leatherworking, grain harvesting and woodworking…” Included in this group are “flake stone tools. “Man the hunter” as the catalyst for Hominin change has been questioned, based on marks on the bones at archaeological sites, it is now more evident that pre-humans were scavenging off of other predators carcasses rather than killing their own food. Mechanical devices experienced an expansion in their use in Ancient Greece and Ancient Rome with the systematic employment of new energy sources. Their use expanded through the Dark Ages with the addition of windmills, machine tools occasioned a surge in producing new tools in the industrial revolution. Advocates of nanotechnology expect a similar surge as tools become microscopic in size, one can classify tools according to their basic functions, Cutting and edge tools, such as the knife, scythe or sickle, are wedge-shaped implements that produce a shearing force along a narrow face. Ideally, the edge of the needs to be harder than the material being cut or else the blade will become dulled with repeated use. But even resilient tools will require periodic sharpening, which is the process of removing deformation wear from the edge, other examples of cutting tools include gouges and drill bits. Moving tools move large and tiny items, many are levers which give the user a mechanical advantage
Tool
–
A modern
toolbox
Tool
–
Prehistoric
stone tools over 10,000 years old, found in
Les Combarelles cave, France
Tool
–
Carpentry tools recovered from the wreck of a 16th-century sailing ship, the
Mary Rose. From the top, a
mallet,
brace,
plane, handle of a
T-auger, handle of a
gimlet, handle of a
hammer?,
rule.
Tool
–
Stone and metal
knives
3.
Hunting
–
Hunting is the practice of killing or trapping animals, or pursuing or tracking them with the intent of doing so. Hunting wildlife or feral animals is most commonly done by humans for food, recreation, to predators that are dangerous to humans or domestic animals. Lawful hunting is distinguished from poaching, which is the killing, trapping or capture of the hunted species. The species that are hunted are referred to as game or prey and are usually mammals, Hunting can also be a means of pest control. However, hunting has also contributed to the endangerment, extirpation and extinction of many animals. The pursuit, capture and release, or capture for food of fish is called fishing, the practice of foraging or gathering materials from plants and mushrooms is also considered separate from hunting. The word hunt serves as both a noun and a verb, the noun has been dated to the early 12th century, act of chasing game, from the verb hunt. The meaning of a body of persons associated for the purpose of hunting with a pack of hounds is first recorded in the 1570s, meaning the act of searching for someone or something is from about 1600. The verb, Old English huntian to chase game, perhaps developed from hunta hunter, is related to hentan to seize, from Proto-Germanic huntojan, the general sense of search diligently is first recorded c. Hunting has a history and may well pre-date the rise of the species Homo sapiens. Evidence from western Kenya suggests that hunting has been occurring for more two million years. Furthermore, evidence exists that hunting may have one of the multiple environmental factors leading to the Holocene extinction of megafauna. North American megafauna extinction was coincidental with the Younger Dryas impact event, however, in other locations such as Australia, humans are thought to have played a very significant role in the extinction of the Australian megafauna that was widespread prior to human occupation. The closest surviving relatives of the species are the two species of Pan, the common chimpanzee and bonobos. Common chimpanzees have a diet that includes troop hunting behaviour based on beta males being led by an alpha male. Bonobos have also observed to occasionally engage in group hunting. With the establishment of language, culture, and religion, hunting became a theme of stories and myths, as well as such as dance. Hunting was a component of hunter-gatherer societies before the domestication of livestock
Hunting
–
Boar hunting,
Tacuinum Sanitatis (a medieval handbook on health and wellbeing) (14th century)
Hunting
–
Mughal aristocrats hunting a
blackbuck alongside an
Asiatic cheetah.
Hunting
–
Saharan rock art
Hunting
–
Inuit walrus hunters
4.
War
–
War is a state of armed conflict between societies. It is generally characterized by extreme aggression, destruction, and mortality, an absence of war is usually called peace. Warfare refers to the activities and characteristics of types of war. Total war is warfare that is not restricted to legitimate military targets. While some scholars see war as a universal and ancestral aspect of human nature, as concerns a belligerents losses in proportion to its prewar population, the most destructive war in modern history may have been the Paraguayan War. In 2013 war resulted in 31,000 deaths, down from 72,000 deaths in 1990, in 2003, Richard Smalley identified war as the sixth biggest problem facing humanity for the next fifty years. Another byproduct of some wars is the prevalence of propaganda by some or all parties in the conflict, the word is related to the Old Saxon werran, Old High German werran, and the German verwirren, meaning “to confuse”, “to perplex”, and “to bring into confusion”. In German, the equivalent is Krieg, the Spanish, Portuguese, the scholarly study of war is sometimes called polemology, from the Greek polemos, meaning war, and -logy, meaning the study of. Studies of war by military theorists throughout military history have sought to identify the philosophy of war, asymmetric warfare is a conflict between two populations of drastically different levels of military capability or size. Biological warfare, or germ warfare, is the use of weaponized biological toxins or infectious agents such as bacteria, viruses, chemical warfare involves the use of weaponized chemicals in combat. Poison gas as a weapon was principally used during World War I. Civil war is a war between forces belonging to the nation or political entity. Conventional warfare is declared war between states in which nuclear, biological, or chemical weapons are not used or see limited deployment, cyberwarfare involves the actions by a nation-state or international organization to attack and attempt to damage another nations information systems. Information warfare is the application of force on a large scale against information assets and systems, against the computers. Nuclear warfare is warfare in which weapons are the primary, or a major. War of aggression is a war for conquest or gain rather than self-defense, the earliest recorded evidence of war belongs to the Mesolithic cemetery Site 117, which has been determined to be approximately 14,000 years old. About forty-five percent of the skeletons there displayed signs of violent death, since the rise of the state some 5,000 years ago, military activity has occurred over much of the globe. The advent of gunpowder and the acceleration of technological advances led to modern warfare
War
–
The War by Tadeusz Cyprian (1949), a photograph in the collection of the
National Museum in
Warsaw showing ruins of Warsaw's Napoleon Square in the aftermath of
World War II.
War
–
Mural of War (1896), by
Gari Melchers
War
–
Ruins of
Guernica (1937). The
Spanish Civil War was one of Europe's bloodiest and most brutal civil wars.
War
–
Japanese
samurai attacking a
Mongol ship, 13th century
5.
Crime
–
In ordinary language, a crime is an unlawful act punishable by a state or other authority. The term crime does not, in criminal law, have any simple and universally accepted definition. The most popular view is that crime is a created by law, in other words, something is a crime if declared as such by the relevant. One proposed definition is that a crime or offence is an act not only to some individual. Such acts are forbidden and punishable by law, the notion that acts such as murder, rape and theft are to be prohibited exists worldwide. What precisely is an offence is defined by criminal law of each country. While many have a catalogue of crimes called the criminal code, the state has the power to severely restrict ones liberty for committing a crime. In modern societies, there are procedures to which investigations and trials must adhere, usually, to be classified as a crime, the act of doing something criminal must – with certain exceptions – be accompanied by the intention to do something criminal. While every crime violates the law, not every violation of the law counts as a crime, breaches of private law are not automatically punished by the state, but can be enforced through civil procedure. With institutional and legal machinery at their disposal, agents of the State can compel populations to conform to codes, authorities employ various mechanisms to regulate certain behaviors in general. In addition, authorities provide remedies and sanctions, and collectively these constitute a criminal justice system, Legal sanctions vary widely in their severity, they may include incarceration of temporary character aimed at reforming the convict. Some jurisdictions have penal codes written to inflict permanent harsh punishments, legal mutilation, usually a natural person perpetrates a crime, but legal persons may also commit crimes. Conversely, at least under U. S. law, nonpersons such as animals cannot commit crimes, the sociologist Richard Quinney has written about the relationship between society and crime. When Quinney states crime is a phenomenon he envisages both how individuals conceive crime and how populations perceive it, based on societal norms. The word crime is derived from the Latin root cernō, meaning I decide, originally the Latin word crīmen meant charge or cry of distress. The Ancient Greek word krima, from which the Latin cognate derives, typically referred to a mistake or an offense against the community. In 13th century English crime meant sinfulness, according to etymonline. com and it was probably brought to England as Old French crimne, from Latin crimen. In Latin, crimen could have signified any one of the following, charge, indictment, accusation, crime, fault, the word may derive from the Latin cernere – to decide, to sift
Crime
Crime
–
Criminology and
penology
Crime
–
The spiked heads of executed criminals once adorned the gatehouse of the medieval
London Bridge.
6.
Wickerwork
–
Wicker is a kind of furniture woven from any one of a variety of cane-like materials, including rattan, willow, reed and bamboo. As such, it is not a material, but a technique. The word wicker is believed to be of Scandinavian origin, wika which means to bend in Swedish, Wicker is traditionally made of material of plant origin, but plastic fibers are now also used. Wicker is light yet sturdy, making it suitable for furniture that will be moved often like porch, a variety of plants are used such as reeds, grasses, creepers, and thin tree branches. Rushwork and wickerwork are terms used in England, Wicker has been documented as far back as ancient Egypt, made from indigenous reed and swamp grasses. Middle-class families could afford a few pieces, such as small tables. However, archaeologists working on the tombs of the wealthy pharaohs have uncovered a variety of wicker items, including chests, baskets, wig boxes. Wicker even found use in the Achaemenid Empire on the battlefield, the popularity of wicker passed from ancient Egypt and Persia to ancient Rome. Wicker baskets were used to carry items in Pompeii, furniture was manufactured out of wicker in the Roman style. It has been proposed that the use of wicker in the Iron Age may have influenced the development of the woven patterns used in Celtic art. By the 16th and 17th centuries, wicker was quite common in European countries like Portugal, Spain, Wicker received a boost during the Age of Exploration, when international sea traders returned from southeast Asia with a species of palm called rattan. Rattan is stronger than traditional European wicker materials, although the stem can be separated so the softer inner core can be used for wicker. The 19th century brought immense popularity for wicker in Europe, England and it was used outdoors as well as indoors. People in the Victorian Era believed it to be more sanitary than upholstered furniture and it was inexpensive, resisted harsh weather and was adaptable to many styles. In the United States, Cyrus Wakefield began constructing rattan furniture in the 1850s and he first used rattan that had been offloaded from ships, where it was used as ballast, but as his designs became well-known, he began importing the material himself. In recent times, its aesthetic was influenced heavily by the Arts and Crafts movement at the turn of the 20th century, Wicker is still a popular material. Antique wicker products are sought after by collectors. Reproductions of furniture and accent pieces are sold for indoor and outdoor use
Wickerwork
–
A handmade wickerwork
cat tree
Wickerwork
Wickerwork
Wickerwork
7.
Duck
–
Duck is the common name for a large number of species in the waterfowl family Anatidae, which also includes swans and geese. The ducks are divided among several subfamilies in the family Anatidae, they do not represent a group but a form taxon, since swans. Ducks are mostly birds, mostly smaller than the swans and geese. Ducks are sometimes confused with several types of unrelated water birds with similar forms, such as loons or divers, grebes, gallinules and this word replaced Old English ened/ænid duck, possibly to avoid confusion with other Old English words, like ende end with similar forms. Other Germanic languages still have similar words for duck, for example, Dutch eend duck, the word ened/ænid was inherited from Proto-Indo-European, compare, Latin anas duck, Lithuanian ántis duck, Ancient Greek nēssa/nētta duck, and Sanskrit ātí water bird, among others. A duckling is a duck in downy plumage or baby duck. A male duck is called a drake and the female is called a duck, the overall body plan of ducks is elongated and broad, and the ducks are also relatively long-necked, albeit not as long-necked as the geese and swans. The body shape of diving ducks varies somewhat from this in being more rounded, the bill is usually broad and contains serrated lamellae, which are particularly well defined in the filter-feeding species. In the case of some fishing species the bill is long, the scaled legs are strong and well developed, and generally set far back on the body, more so in the highly aquatic species. The wings are strong and are generally short and pointed. Three species of duck are almost flightless, however. Many species of duck are temporarily flightless while moulting, they seek out protected habitat with good food supplies during this period, the drakes of northern species often have extravagant plumage, but that is moulted in summer to give a more female-like appearance, the eclipse plumage. The plumage of birds generally resembles that of the female. Over the course of evolution, female ducks have evolved to have a corkscrew shaped vagina to prevent rape, Ducks exploit a variety of food sources such as grasses, aquatic plants, fish, insects, small amphibians, worms, and small molluscs. Dabbling ducks feed on the surface of water or on land, along the edge of the beak there is a comb-like structure called a pecten. This strains the water squirting from the side of the beak, the pecten is also used to preen feathers and to hold slippery food items. Diving ducks and sea ducks forage deep underwater, to be able to submerge more easily, the diving ducks are heavier than dabbling ducks, and therefore have more difficulty taking off to fly. A few specialized species such as the mergansers are adapted to catch, to avoid injury when digging into sediment it has no cere, but the nostrils come out through hard horn
Duck
–
Ducks
Duck
–
Pacific black duck displaying the characteristic upending "duck".
Duck
–
Male
Mandarin duck
Duck
–
Ducks in the ponds at
Khulna, Bangladesh
8.
Bird ringing
–
Bird ringing or bird banding is the attachment of a small, individually numbered metal or plastic tag to the leg or wing of a wild bird to enable individual identification. This helps in keeping track of the movements of the bird and it is common to take measurements and examine conditions of feather molt, subcutaneous fat, age indications and sex during capture for ringing. Other methods of marking birds may also be used to allow for field based identification that does not require capture, the earliest recorded attempts to mark birds were made by Roman soldiers. One instance occurred during the Punic Wars, In 218 BC a crow was released by a besieged garrison, quintus Fabius Pictor used a thread on the birds leg to send a message back. In another instance, an interested in chariot races during the time of Pliny took crows to Volterra,135 miles away. Falconers in the Middle Ages would fit plates on their falcons with seals of their owners, from around 1560 or so, swans were marked with a swan mark, a nick on the bill. Storks injured by arrows traceable to African tribes were found in Germany in 1822, Ringing of birds for scientific purposes was started in 1899 by Hans Christian Cornelius Mortensen, a Danish schoolteacher, using aluminum rings on European starlings. The first banding scheme was established in Germany by Johannes Thienemann in 1903 at the Rossitten Bird Observatory on the Baltic Coast of East Prussia and this was followed by Hungary in 1908, Great Britain in 1909, Yugoslavia in 1910 and the Scandinavian countries between 1911 and 1914. In North America John James Audubon and Ernest Thompson Seton were pioneers although their method of marking birds was different from modern ringing, Audubon tied silver threads onto the legs of young eastern phoebes in 1803 while Seton marked snow buntings in Manitoba with ink in 1882. Paul Bartsch of the Smithsonian Institution is credited with the first modern banding in the U. S. he banded 23 black-crowned night herons in 1902. Bird ringing is the used in the UK and in some other parts of Europe, while the term bird banding is more often used in the USA. Organised ringing efforts are called ringing or banding schemes, and the organisations that run them are ringing or banding authorities and those who ring or band birds are known as ringers or banders, and they are typically active at ringing or banding stations. Birds may be captured by being taken as young birds at the nest, or as adults, captured in fine mist nets, baited traps, Heligoland traps, drag nets, cannon nets, raptors may be caught by many methods, including bal-chatri traps. When a bird is caught, a ring of size is attached to the birds leg. The bird is often weighed and measured, examined for data relevant to the ringers project, the birds so tagged can then be identified when they are re-trapped, or found dead, later. When a ringed bird is found, and the ring number read and reported back to the ringer or ringing authority, the finder can contact the address on the ring, give the unique number, and be told the known history of the birds movements. Some national ringing/banding authorities also accept reports by phone or on web sites. The organising body, by collating many such reports, can then determine patterns of movements for large populations
Bird ringing
–
An early bird band used by
Jack Miner for geese.
Bird ringing
–
A researcher uses a tool to attach the band to the leg of this
European serin.
Bird ringing
–
A ringed
ruby-crowned kinglet recaptured in a
mist net
Bird ringing
–
A
yellow-throated fulvetta with a numbered aluminum ring on its left tarsus
9.
Ornithology
–
Ornithology is a branch of zoology that concerns the study of birds. The word ornithology derives from the ancient Greek ὄρνις ornis and λόγος logos, several aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds. Most marked among these is the extent of studies undertaken by amateurs working within the parameters of strict scientific methodology, most modern biological theories apply across taxonomic groups and the number of professional scientists who identify themselves as ornithologists has therefore declined. A wide range of tools and techniques are used in ornithology, the origins of the word ornithology come from the Greek ornithologos and late 17th-century Latin ornithologia meaning bird science. Trends include the move from mere descriptions to the identification of patterns, Humans have had an observational relationship with birds since prehistory, with some stone age drawings being amongst the oldest indications of an interest in birds. Birds were perhaps important as a source, and bones of as many as 80 species have been found in excavations of early Stone Age settlements. Waterbird and seabird remains have also found in shell mounds on the island of Oronsay off the coast of Scotland. Cultures around the world have rich vocabularies related to birds, traditional bird names are often based on detailed knowledge of the behaviour, with many names being onomatopoeic, many still in use. Traditional knowledge may also involve the use of birds in folk medicine, hunting of wild birds as well as their domestication would have required considerable knowledge of their habits. Poultry farming and falconry were practised from early times in many parts of the world, artificial incubation of poultry was practised in China around 246 BC and around at least 400 BC in Egypt. The Egyptians also made use of birds in their scripts, many of which. Early written records provide information on the past distributions of species. For instance Xenophon records the abundance of the ostrich in Assyria, other old writings such as the Vedas demonstrate the careful observation of avian life histories and includes the earliest reference to the habit of brood parasitism by the Asian koel. Like writing, the art of China, Japan, Persia and India also demonstrate knowledge. Aristotle in 350 BC in his Historia Animalium noted the habit of migration, moulting, egg laying and life spans. Similar misconceptions existed regarding the breeding of barnacle geese, around 77 AD, Pliny the Elder described birds, among other creatures, in his Historia Naturalis. The origins of falconry have been traced to Mesopotamia and the earliest record comes from the reign of Sargon II, falconry made its entry to Europe only after AD400, brought in from the East after invasions by the Huns and Allans. Frederick II of Hohenstaufen learned about Arabian falconry during wars in the region and he had this work translated into Latin and also conducted experiments on birds in his menagerie
Ornithology
–
House sparrow (Passer domesticus)
Ornithology
–
Belon's comparison of birds and humans in his Book of Birds, 1555
Ornithology
–
Cover of
Ulisse Aldrovandi 's Ornithology, 1599
Ornithology
–
Antonio Valli da Todi, who wrote on
aviculture in 1601, knew the connections between territory and song
10.
Dutch language
–
It is the third most widely spoken Germanic language, after English and German. Dutch is one of the closest relatives of both German and English and is said to be roughly in between them, Dutch vocabulary is mostly Germanic and incorporates more Romance loans than German but far fewer than English. In both Belgium and the Netherlands, the official name for Dutch is Nederlands, and its dialects have their own names, e. g. Hollands, West-Vlaams. The use of the word Vlaams to describe Standard Dutch for the variations prevalent in Flanders and used there, however, is common in the Netherlands, the Dutch language has been known under a variety of names. It derived from the Old Germanic word theudisk, one of the first names used for the non-Romance languages of Western Europe. It literarily means the language of the people, that is. The term was used as opposed to Latin, the language of writing. In the first text in which it is found, dating from 784, later, theudisca appeared also in the Oaths of Strasbourg to refer to the Germanic portion of the oath. This led inevitably to confusion since similar terms referred to different languages, owing to Dutch commercial and colonial rivalry in the 16th and 17th centuries, the English term came to refer exclusively to the Dutch. A notable exception is Pennsylvania Dutch, which is a West Central German variety called Deitsch by its speakers, Jersey Dutch, on the other hand, as spoken until the 1950s in New Jersey, is a Dutch-based creole. In Dutch itself, Diets went out of common use - although Platdiets is still used for the transitional Limburgish-Ripuarian Low Dietsch dialects in northeast Belgium, Nederlands, the official Dutch word for Dutch, did not become firmly established until the 19th century. This designation had been in use as far back as the end of the 15th century, one of them was it reflected a distinction with Hoogduits, High Dutch, meaning the language spoken in Germany. The Hoog was later dropped, and thus, Duits narrowed down in meaning to refer to the German language. g, in English, too, Netherlandic is regarded as a more accurate term for the Dutch language, but is hardly ever used. Old Dutch branched off more or less around the same time Old English, Old High German, Old Frisian and Old Saxon did. During that period, it forced Old Frisian back from the western coast to the north of the Low Countries, on the other hand, Dutch has been replaced in adjacent lands in nowadays France and Germany. The division in Old, Middle and Modern Dutch is mostly conventional, one of the few moments linguists can detect somewhat of a revolution is when the Dutch standard language emerged and quickly established itself. This is assumed to have taken place in approximately the mid-first millennium BCE in the pre-Roman Northern European Iron Age, the Germanic languages are traditionally divided into three groups, East, West, and North Germanic. They remained mutually intelligible throughout the Migration Period, Dutch is part of the West Germanic group, which also includes English, Scots, Frisian, Low German and High German
Dutch language
–
The Utrecht baptismal vow Forsachistu diobolae...
Dutch language
–
Distribution of the Dutch language and its dialects in
Western Europe
Dutch language
–
Second edition of this column decorated with a title of
Charles V 's portrait, with archaic Dutch inscriptions
Dutch language
–
Dutch language street sign in the Netherlands
11.
Retronym
–
A retronym is a neologism for a word created to differentiate between two words, where previously no clarification was required. Advances in technology are responsible for the coinage of retronyms. For example, the acoustic guitar was coined at the advent of electric guitars. Since the end of the 19th century, most bicycles have been expected to have two equal sized wheels, and the type has been renamed penny-farthing or high-wheeler bicycle. Similarly, the term cisgender was coined to describe persons who identify with the gender they were assigned at birth, the term retronym was coined by Frank Mankiewicz in 1980 and popularized by William Safire in The New York Times Magazine. In 2000 The American Heritage Dictionary became the first major dictionary to include the word retronym, back-formation Backronym Contrastive focus reduplication -onym Protologism
Retronym
–
This column about "trucks and cars" from
Popular Mechanics in 1914 was written when the word truck did not necessarily connote a
motor truck and the word car did not necessarily connote a
motor car. The same topics today would most likely be talked about with the terms
hand trucks and
railroad cars. Those terms existed in 1914 as well, but they were not required for clarity, as they would be today.
12.
Folk art
–
Folk art encompasses art produced from an indigenous culture or by peasants or other laboring tradespeople. In contrast to fine art, folk art is primarily utilitarian, Folk Art is characterized by a naïve style, in which traditional rules of proportion and perspective are not employed. The varied geographical and temporal prevalence and diversity of folk art make it difficult to describe as a whole, though some patterns have been demonstrated. On the other hand, many 18th- and 19th-century American folk art painters made their living by their work, including itinerant portrait painters, some of whom produced large bodies of work. Terms that might overlap with folk art are naïve art, tribal art, primitive art, popular art, outsider art, traditional art, tramp art and working-class art/blue-collar art. As one might expect, these terms can have multiple and even controversial connotations but are used interchangeably with the term folk art. Folk art expresses cultural identity by conveying shared community values and aesthetics and it encompasses a range of utilitarian and decorative media, including cloth, wood, paper, clay, metal and more. If traditional materials are inaccessible, new materials are often substituted, Folk art reflects traditional art forms of diverse community groups — ethnic, tribal, religious, occupational, geographical, age- or gender-based — who identify with each other and society at large. Folk artists traditionally learn skills and techniques through apprenticeships in informal community settings, antique folk art is distinguished from traditional art in that, while collected today based mostly on its artistic merit, it was never intended to be art for art’s sake at the time of its creation. Many folk art traditions like quilting, ornamental picture framing, and decoy carving continue to thrive, contemporary folk artists are frequently self-taught as their work is often developed in isolation or in small communities across the country. Folk artworks, styles and motifs have inspired various artists, for example, Pablo Picasso was inspired by African tribal sculptures and masks, while Natalia Goncharova and others were inspired by traditional Russian popular prints called luboks. In music, Igor Stravinskys seminal The Rite of Spring was inspired by religious rites. CIOFF, International Council of Organizations of Folklore Festivals and Folk Arts
Folk art
–
"Gran calavera eléctrica" by
José Guadalupe Posada, Mexico, 1900–1913
Folk art
–
Island of Salvation Botanica, Piety Street,
Bywater, New Orleans
Folk art
–
Darrel Mortimer holding 8' tattooed bamboo
chillum; photograph by Sally Larsen, 2009
Folk art
–
House in
New Orleans
13.
Dummy tank
–
A dummy tank, usually inflatable or wooden, is a type of decoy that either is intended to be mistaken by an enemy for a real tank or used for training purposes. Dummy tanks emerged soon after the introduction of tanks in World War I. During World War I, Allied forces made use of versions of the British heavy tanks. These were constructed from a framework and covered with painted Hessian cloth. The tracks were non-functional so some were fitted with concealed wheels underneath and were towed from place to place by a pair of horses. Dummy tanks, representing Allied models, were found to have been constructed by the Germans. It is possible they were used in training, rather than for military deception, dummy tanks saw significantly more use during World War II by both the Allies and the Axis. German forces utilized mock tanks prior to the start of the war for practice and their use in military deception was pioneered by British forces, who termed them spoofs. One of the first uses of dummy tanks during the Second World War was in the North African Campaign. The Royal Engineers stationed there constructed two per day, between April and June 1941, they were able to build three dummy Royal Tank Regiments, and another in November that same year and these were foldable, and thus portable, and the Royal Engineers improved them further. Jeeps were used to make the more realistic, a steel frame covered with canvas was placed on them. The Jeep did not realistically simulate the noise or movement of a tank, meanwhile, the reverse was also done, to make tanks look like trucks. A further device was put into use that both created simulated tank tracks and erased real ones, inflatable dummies consisted of a fabric covering supported by a network of pressurized rubber tubes that formed a kind of pneumatic skeleton. These were generally preferred in the field, despite their tendency to rapidly deflate if punctured by accident or shellfire, dummy tanks were used in Operation Fortitude prior to the landings at the Normandy Beaches. During Operation Shingle at Anzio, Italy, inflatable Sherman tanks were deployed when the tanks were elsewhere. In the Pacific Theater of Operations, the Japanese also utilized decoys, a tank was surrounded by American infantry, which had been under artillery bombardment, they found it was not real, but merely a sculpture carved out of volcanic ash. The Red Army employed dummy tanks to increase their apparent numbers, during the Kosovo War, the Yugoslav Army regularly placed dummy tanks in Kosovo which misled NATO forces into thinking that they were destroying far more real tanks than actually occurred. The United States Army has developed a dummy tank
Dummy tank
–
World War I Australian troops carrying a dummy
Mark V tank (September 1918)
Dummy tank
–
Dummy tanks, mounted on trucks, going to the forward areas in the Western Desert, 13 February 1942
Dummy tank
–
An inflatable dummy tank, modeled after the
M4 Sherman
Dummy tank
–
A dummy Sherman tank under construction by 6 Field Park Company, Royal Engineers, in the Anzio bridgehead, 29 April 1944.
14.
M4 Sherman
–
The M4 Sherman, officially Medium Tank, M4, was the most numerous battle tank used by the United States and some of the other Western Allies in World War II. The M4 Sherman proved to be reliable, relatively cheap to produce, thousands were distributed through the Lend-Lease program to the British Commonwealth and Soviet Union. The tank was named by the British for the American Civil War General William Tecumseh Sherman, the M4 Sherman evolved from the interim M3 Medium Tank, which had its main armament in a side sponson mount. The M4 retained much of the mechanical design, but put the main 75 mm gun in a fully traversing turret. The designers stressed mechanical reliability, ease of production and maintenance, durability, standardization of parts and ammunition in a number of variants. These factors, combined with the Shermans then-superior armor and armament, outclassed German light, the M4 went on to be produced in large numbers. It spearheaded many offensives by the Western Allies after 1942, for this reason, the US Army believed that the M4 would be adequate to win the war, and no pressure was exerted for further tank development. Logistical and transport restrictions, such as limitations imposed by roads, ports, Tank destroyer battalions using vehicles built on the M4 hull and chassis, but with open-topped turrets and more potent high-velocity guns, also entered widespread use in the Allied armies. Even by 1944, most M4 Shermans kept their dual purpose 75 mm gun, some Shermans were produced with a more capable gun, the 76 mm gun M1, or refitted with a 17-pounder by the British. These factors combined to give the Allies numerical superiority in most battles, the U. S. Army Ordnance Department designed the M4 medium tank as a replacement for the M3 medium tank. The M3 was a development of the M2 Medium Tank of 1939. The M3 was developed as a stopgap measure until a new turret mounting a 75 mm gun could be devised, though reluctant to adopt the British army weapons in their entirety the American designers were prepared to accept proved British ideas. British ideas, as embodied with in a designed by the Canadian General Staff. Before long American Services and designers had accumulated sufficient experience to forge ahead on several points, in the field of tank armament the American 75mm and 76mm dual-purpose tank guns won the acknowledgement of British tank experts. On 18 April 1941, the U. S, Armored Force Board chose the simplest of five designs. Known as the T6, the design was a modified M3 hull and chassis and this would later became the Sherman. The goals were to produce a fast, dependable medium tank able to support infantry, provide breakthrough striking capacity, the T6 prototype was completed on 2 September 1941. The T6 upper hull was a large casting
M4 Sherman
–
An M4 (105) model Sherman preserved at the Langenberg Liberation Memorial,
Ede, Netherlands in 2010.
M4 Sherman
–
Cutaway Sherman showing transmission and driver's seat.
M4 Sherman
–
A Sherman
DD tank of 13th/18th Royal Hussars in action against German troops using crashed
Horsa gliders as cover near Ranville,
Normandy, 10 June 1944.
M4 Sherman
–
M4A1 (76)W Sherman with cast hull
15.
Military dummy
–
Dummies and decoys are fake military equipment that are intended to deceive the enemy. Dummies and decoys are only one aspect of military deception, during World War II, multiple dummy airfields and even towns were used in England to divert German bombers from the real targets. At the Battle of La Ciotat in 1944, American aircraft dropped hundreds of dummy paratroopers just north of La Ciotat, the goal of this operation was to divert German troops away from the main landing zones of Operation Dragoon. Additionally, during World War II, Operation Quicksilver was an attempt to mislead the Germans as to the location of the D-Day invasion using dummy military equipment, a naval example was the British battleship HMS Centurion. Obsolete and disarmed by World War II, she spent two years in the Mediterranean fitted with guns, to make British naval forces in the area seem stronger than they were. Likewise, Fleet tender was the codename for a number of British merchant ships that fitted with dummy structures to resemble warships. In Russia, a hot air balloon factory has continued in the 2010s to make dummy tanks, aircraft, missile launch pads, radar stations. The inflatable dummies are designed to present an image to enemy radar. An intercontinental ballistic missile may release decoys in addition to one or more warheads, Dummy round Dummy tank Maskirovka Q-ship Quaker Gun Rubber duck Victor Jones
Military dummy
–
Inflatable
S-300 missile system
Military dummy
–
F-16 mockups on a fake taxiway at
Spangdahlem Air Base, 1985.
Military dummy
–
Dummy replica aircraft used by US Navy to train aircraft ordnance technicians during
World War II.
16.
Military deception
–
Military deception refers to attempts to mislead enemy forces during warfare. This is usually achieved by creating or amplifying an artificial fog of war via psychological operations, information warfare, visual deception, as a form of strategic use of information, it overlaps with psychological warfare. To the degree that any enemy that falls for the deception will lose confidence when it is revealed, deception in warfare dates back to early history. The Art of War, an ancient Chinese military treatise, puts emphasis on the tactic. In modern times military deception has developed as a fully fledged doctrine, misinformation and visual deception were employed during World War I and came into even greater prominence during World War II. In the buildup to the 1944 invasion of Normandy the Allies executed one of the largest deceptions in military history, Operation Bodyguard, broadly, military deception may take both strategic and tactical forms. Deception across a battlefield was uncommon until the modern age. In a practical sense military deception employs visual misdirection, misinformation, the use of military camouflage, especially on a large scale, is a form of deception. The Russian loanword maskirovka is used to describe the Soviet Union and Russias military doctrine of surprise through deception, fictional units Creating entirely fictional forces or exaggerating the size of an army. Smoke screen A tactical deception involving smoke, fog, or other forms of concealment to hide battlefield movements, Trojan horse Gaining admittance to a fortified area under false pretences, to later admit a larger attacking force. Strategic envelopment A small force distracts the enemy while a larger force moves to attack from the rear. Deception has been a part of warfare from the dawn of history, at first it fell to individual commanders to develop tactical deception on the battlefield. It was not until the era that deception was organised at a high strategic level. Early examples of military deception exist in the ancient dynasties of Egypt and China, hannibal, widely recognised as one of the finest military commanders in history, made extensive use of deception in his campaigns. The Ancient Greeks were noted for several forms of tactical deception and they certainly invented smoke screens during the Peloponnesian War and later stories refer to the famous Trojan horse which allowed them to defeat Troy. In his 52 BC conquest of Gaul, Julius Caesar successfully used tactical deception to achieve a crossing of the Allier river and his opponent, Vercingetorix, shadowed Caesars force from the opposite bank, contesting any attempted crossing. Caesar camped overnight in a wood, when departing the day he left a third of his force behind. Once the coast was clear, the hidden forces rebuilt a smashed crossing, one volume of Roman aristocrat Frontinuss Stratagems, written in the first century AD, deals entirely with deception
Military deception
–
Dummy airbase and aircraft
Military deception
–
Dummy
Long Tom artillery position deployed during the
Second Boer War
Military deception
–
World War 1 Australian troops carrying a dummy
Mark IV tank, intended to deceive German forces during the following day's assault on part of the
Hindenburg Line (September 1918)
17.
Quaker Gun
–
A Quaker gun is a deception tactic that was commonly used in warfare during the 18th and 19th centuries. Although resembling a cannon, the Quaker gun was simply a wooden log, usually painted black. Misleading the enemy as to the strength of an emplacement was a delaying tactic. The name derives from the Religious Society of Friends or Quakers, ordered to leave a regular force of colonial dragoons in the North Carolina theater by Brigadier General Daniel Morgan, Colonel Washington still lacked the proper artillery to dislodge the Loyalists. On December 4, the Americans were able to trap the Loyalist Colonel Rowland Rugeley and his force of about 125 men in Rugeley’s house and barn near Camden and he told his cavalrymen to dismount and surround the barn. Out of Rugeley’s sight, Washington’s men prepared a pine log to resemble a cannon, the Quaker gun Trick worked quite well. Colonel Washington aimed the wooden cannon toward the buildings the Loyalists had barricaded themselves in, Rugeley surrendered quickly his entire force without a single shot having been fired. Quaker guns were used by both the North and South in the American Civil War, the Confederate States Army frequently resorted to them because of its shortage of artillery. The wooden guns were painted black and positioned in fortifications to delay Union assaults, sometimes actual gun carriages were used in the deception. The most famous use of a Quaker gun was by Confederate General Joseph E, another example happened during the Siege of Corinth. During the night of May 29, the Confederate army moved out and they used the Mobile and Ohio Railroad to carry the sick and wounded, the heavy artillery, and tons of supplies. When a train arrived, the troops cheered as though reinforcements were arriving and they set up dummy Quaker guns along the defensive earthworks. Camp fires were burning, and buglers and drummers played. The rest of the men slipped away undetected, the early model B-25B had no guns installed in the tail section to help protect the planes from tail-end attacks. Dummy equipment was used extensively by the Allies in Operation Fortitude. The pre–World War I British battleship HMS Centurion was obsolete and disarmed by World War II, however, from 1942 to 1944, she was fitted with wooden guns and stationed in the eastern Mediterranean, to make British naval forces in the area seem stronger than they were. Unlike a Quaker gun, a cannon is a functional weapon, albeit notoriously weak and only able to fire a few shots, sometimes even just one shot. These were used by those without access to metal or the skill to engineer metallic cannons, dummy tank Victor Jones Ripley, Warren
Quaker Gun
–
"Quaker guns" (logs used as ruses to imitate cannons) in former Confederate fortifications at Manassas Junction March 1862
Quaker Gun
–
Quaker Gun near Centreville, Virginia, in March 1862, after the Confederate withdrawal
Quaker Gun
–
Quaker guns made of pine logs were mounted in a ruse to fool the Union into believing that the Confederates were much better armed at the
Siege of Port Hudson, Louisiana in 1863. Black rings were painted on the end of the logs to make the muzzles look convincing. It worked. After
Admiral Farragut 's two vessels passed by Port Hudson, the Union chose to never attack from the river again.
18.
Defense (military)
–
The task of the military is usually defined as defense of the state, and its citizens, and the prosecution of war against another state. The profession of soldiering as part of a military is older than recorded history itself, some of the most enduring images of the classical antiquity portray the power and feats of its military leaders. The Battle of Kadesh in 1274 BC was one of the points of Pharaoh Ramses IIs reign. A thousand years later, the first emperor of unified China, Qin Shi Huang, was so determined to impress the gods with his military might, he was buried with an army of terracotta soldiers. The Romans were dedicated to military matters, leaving to posterity many treatises and writings, as well as a number of lavishly carved triumphal arches. Issue, Possibly cognate with Thousand, cf. Latin and Romance language root word mil-) The first recorded use of the military in English. It comes from the Latin militaris through French, but is of uncertain etymology, the word is now identified as denoting someone that is skilled in use of weapons, or engaged in military service, or in warfare. As a noun, the military usually refers generally to an armed forces, or sometimes, more specifically. In general, it refers to the physicality of armed forces, their personnel, equipment, as an adjective, military originally referred only to soldiers and soldiering, but it soon broadened to apply to land forces in general, and anything to do with their profession. The names of both the Royal Military Academy and United States Military Academy reflect this, as such, it now connotes any activity performed by armed force personnel. Military history is considered to be the history of all conflicts. Military history has a number of facets, one main facet is to learn from past accomplishments and mistakes, so as to more effectively wage war in the future. Another is to create a sense of tradition, which is used to create cohesive military forces. Still another may be to learn to prevent wars more effectively, human knowledge about the military is largely based on both recorded and oral history of military conflicts, their participating armies and navies and, more recently, air forces. In the whole history of humanity, every nation had different needs for military forces, how these needs are determined forms the basis of their composition, equipment, and use of facilities. It also determines what military does in terms of peacetime, All military forces, whether large or small, are military organizations that have official state, and world recognition as such. Organisations with similar features are paramilitary, civil defense, militia and these commonalities of the states military define them. Another role of military personnel is to ensure a continuous replacement of departing servicemen and women through recruitment
Defense (military)
–
Soldiers from
the Canadian Grenadier Guards in the
Kandahar Province of Afghanistan
Defense (military)
–
CF-18 Hornet launches a laser-guided bomb
Defense (military)
–
The
Kawasaki C-1 is a tactical military transport of the
Japan Air Self-Defence Force.
Defense (military)
–
Dutch civilians celebrating the arrival of the
I Canadian Corps in
Utrecht as the
Canadian Army liberates the Netherlands from Nazi occupation
19.
Chaff (radar countermeasure)
–
Modern armed forces use chaff to distract radar-guided missiles from their targets. Most military aircraft and warships have chaff dispensing systems for self-defense, an intercontinental ballistic missile may release in its midcourse phase several independent warheads as well as penetration aids such as decoy balloons and chaff. The idea of using chaff developed independently in the United Kingdom, Germany, an early idea was to use sheets the size of a notebook page, these would be printed so they would also serve as propaganda leaflets. However, it was found the most effective version used strips of black paper backed with foil, exactly 27 by 2 centimetres. The Head of the TRE, A. P. Rowe, meanwhile, in Germany, similar research had led to the development of Düppel. The German code name was that of the estate on which the first German tests with chaff had been made, circa 1942. Once the idea had been passed to the US via the Tizard Mission, Fred Whipple developed a system for dispensing strips for the USAAF, the systems were all essentially identical in concept, small aluminium strips cut to one-half of the target radars wavelength. When hit by the radar, such lengths of metal resonate and re-radiate the signal, opposing defences would find it almost impossible to distinguish the aircraft from the echoes caused by the chaff. Other radar-confusing techniques included Mandrel, Piperack, and Jostle and this caused concern in RAF Fighter Command and Anti-Aircraft Command, who managed to suppress the use of Window until July 1943. At this time, it was felt the new generation of centimetric radars available to Fighter Command would deal with any Luftwaffe response to RAF Bomber Command use. Bomber Harris, Commander-in-Chief of RAF Bomber Command, finally got approval to use Window as part of Operation Gomorrah, the first aircrew trained to use Window were 76 squadron. Twenty-four crews were briefed on how to drop the bundles of aluminised-paper strips, one every minute through the flare chute, the radar guided master searchlights wandered aimlessly across the sky. The anti-aircraft guns fired randomly or not at all and the fighters, their radar displays swamped with false echoes. Over a week of attacks a vast area of Hamburg was devastated, resulting in more than 40,000 civilian deaths, squadrons quickly had special chutes fitted to their bombers to make the deployment even easier. Seeing this as a development that made it safer to go on operations, a lesser known fact is that the Luftwaffe used this technology just six weeks after the above-mentioned Hamburg raid. The German strips were cut into 80 centimetre by 1.9 centimetre lengths, in a series of raids in 1943, and the mini-blitz of Operation Steinbock between February and May 1944, Düppel allowed German bombers to once again attempt to operate over London. Although theoretically effective, the number of bombers, notably in relation to the RAFs now-large night fighter force. The British fighters were able to go aloft in large numbers, the Germans obtained better results during the air raid on Bari, on 2 December 1943, when Allied radars were effectively deceived by the use of Düppel strips
Chaff (radar countermeasure)
–
Modern US Navy RR-144 (top) and RR-129 (bottom) chaff countermeasures and containers. Note how the strips of the RR-129 chaff, bottom, are of different widths, while those of the RR-144, top, are all the same width. The RR-144 is designed to prevent interference with civil ATC radar systems.
Chaff (radar countermeasure)
–
A
Lancaster dropping chaff (the crescent-shaped white cloud on the left of the picture) over
Essen during a thousand-bomber raid.
Chaff (radar countermeasure)
–
The effect of chaff on the display of a
Giant Würzburg radar. The effect of jamming appears in the left "jagged" half of the circular ring, contrasting with the normal "smooth" (unjammed) display on the right half of the circle, with a real target at the 3 o'clock position – on the jammed left side the real target "blip" would have been indistinguishable from the jamming.
Chaff (radar countermeasure)
–
Letter from Secretary of the Navy,
James Forrestal to Merwyn Bly
20.
ICBM
–
An intercontinental ballistic missile is a guided ballistic missile with a minimum range of 5,500 kilometres primarily designed for nuclear weapons delivery. Similarly, conventional, chemical, and biological weapons can also be delivered with varying effectiveness, most modern designs support multiple independently targetable reentry vehicles, allowing a single missile to carry several warheads, each of which can strike a different target. Early ICBMs had limited precision that allowed them to be used only against the largest targets such as cities and they were seen as a safe basing option, one that would keep the deterrent force close to home where it would be difficult to attack. Attacks against military targets, if desired, still demanded the use of a more precise manned bomber, the result is that the power of a nuclear explosion to rupture hardened structures is greatly decreased by the distance from the impact point of the nuclear weapon. So a near-direct hit is generally necessary, as only diminishing returns are gained by increasing bomb yield, second- and third-generation designs dramatically improved accuracy to the point where even the smallest point targets can be successfully attacked. Short and medium-range ballistic missiles are known collectively as theatre ballistic missiles, the ICBM A9/A10 rocket initially was intended to be guided by radio, but was changed to be a piloted craft after the failure of Operation Elster. The second stage of the A9/A10 rocket was tested a few times in January and February 1945, the progenitor of the A9/A10 was the German V-2 rocket, also designed by von Braun and widely used at the end of World War II to bomb British and Belgian cities. All of these rockets used liquid propellants, in the immediate post-war era, the US and USSR both started rocket research programs based on the German wartime designs, especially the V-2. In the US, each branch of the military started its own programs, in the USSR, rocket research was centrally organized, although several teams worked on different designs. Early designs from both countries were short-range missiles, like the V-2, but improvements quickly followed, in the USSR early development was focused on missiles able to attack European targets. This changed in 1953 when Sergei Korolyov was directed to development of a true ICBM able to deliver newly developed hydrogen bombs. Given steady funding throughout, the R-7 developed with some speed, the first launch took place on 15 May 1957 and led to an unintended crash 400 km from the site. The first successful test followed on 21 August 1957, the R-7 flew over 6,000 km, the first strategic-missile unit became operational on 9 February 1959 at Plesetsk in north-west Russia. It was the same R-7 launch vehicle that placed the first artificial satellite in space, Sputnik, the first human spaceflight in history was accomplished on a derivative of R-7, Vostok, on 12 April 1961, by Soviet cosmonaut Yuri Gagarin. The U. S. initiated ICBM research in 1946 with the RTV-A-2 Hiroc project and this was a three-stage effort with the ICBM development not starting until the third stage. However, funding was cut after only three successful launches in 1948 of the second stage design, used to test variations on the V-2 design. With overwhelming air superiority and truly intercontinental bombers, the newly forming US Air Force did not take the problem of ICBM development seriously. Things changed in 1953 with the Soviet testing of their first thermonuclear weapon, the Atlas A first flew on 11 June 1957, the flight lasted only about 24 seconds before the rocket blew up
ICBM
–
The Atlas missile was the first US ICBM. First launch 1957, successful launch 1958
ICBM
–
The
R-7 Semyorka was the world's first ICBM and satellite launch vehicle
ICBM
–
Test launch of an
LGM-25C Titan II ICBM from an
underground silo at
Vandenberg AFB during the mid-1970s
ICBM
–
A
Minuteman III ICBM test launch from
Vandenberg Air Force Base,
CA, United States
21.
Rocket
–
A rocket is a missile, spacecraft, aircraft or other vehicle that obtains thrust from a rocket engine. Rocket engine exhaust is formed entirely from propellant carried within the rocket before use, Rocket engines work by action and reaction and push rockets forward simply by expelling their exhaust in the opposite direction at high speed, and can therefore work in the vacuum of space. In fact, rockets work more efficiently in space than in an atmosphere, multistage rockets are capable of attaining escape velocity from Earth and therefore can achieve unlimited maximum altitude. Compared with airbreathing engines, rockets are lightweight and powerful and capable of generating large accelerations. To control their flight, rockets rely on momentum, airfoils, auxiliary engines, gimballed thrust, momentum wheels, deflection of the exhaust stream, propellant flow, spin. Rockets for military and recreational uses date back to at least 13th century China, significant scientific, interplanetary and industrial use did not occur until the 20th century, when rocketry was the enabling technology for the Space Age, including setting foot on the Earths moon. Rockets are now used for fireworks, weaponry, ejection seats, launch vehicles for satellites, human spaceflight. Chemical rockets are the most common type of high power rocket, chemical rockets store a large amount of energy in an easily released form, and can be very dangerous. However, careful design, testing, construction and use minimizes risks, the first gunpowder-powered rockets were developed in Song China, by the 13th century. The Chinese rocket technology was adopted by the Mongols and the invention was spread via the Mongol invasions to the Near East, medieval and early modern rockets were used militarily as incendiary weapons in sieges. An early Chinese text to mention the use of rockets was the Huolongjing, between 1270 and 1280, Hasan al-Rammah wrote al-furusiyyah wa al-manasib al-harbiyya, which included 107 gunpowder recipes,22 of which are for rockets. In Europe, Konrad Kyeser described rockets in his military treatise Bellifortis around 1405. The name Rocket comes from the Italian rocchetta, meaning bobbin or little spindle, the Italian term was adopted into German in the mid 16th century by Leonhard Fronsperger and Conrad Haas, and by the early 17th century into English. Artis Magnae Artilleriae pars prima, an important early work on rocket artillery. The first iron-cased rockets were developed in the late 18th century in the Kingdom of Mysore, in 1814, Francis Scott Key wrote the line rockets red glare while held captive on a British ship that was laying siege to Fort McHenry. The first mathematical treatment of the dynamics of rocket propulsion is due to William Moore, in 1815, Alexander Dmitrievich Zasyadko constructed rocket-launching platforms, which allowed rockets to be fired in salvos, and gun-laying devices. William Hale in 1844 greatly increased the accuracy of rocket artillery, the Congreve rocket was further improved by Edward Mounier Boxer in 1865. Konstantin Tsiolkovsky first speculated on the possibility of manned spaceflight with rocket technology, robert Goddard in 1920 published proposed improvements to rocket technology in A Method of Reaching Extreme Altitudes
Rocket
–
A
Soyuz-U, at
Baikonur cosmodrome 's
Site 1/5 in
Kazakhstan
Rocket
–
A depiction of the "long serpent" rocket launcher from the 11th century book
Wujing Zongyao. The holes in the frame are designed to keep the fire arrows separate.
Rocket
–
Ryusei Festival at
Yoshida town,
Chichibu city,
Saitama, Japan
Rocket
–
Kyeser was infatuated with the
legend of Alexander the Great: here Alexander holds a rocket, the first depiction of one
22.
Atmospheric reentry
–
Atmospheric entry is the movement of an object from outer space into and through the gases of an atmosphere of a planet, dwarf planet or natural satellite. Technologies and procedures allowing the atmospheric entry, descent and landing of spacecraft are collectively abbreviated as EDL. Atmospheric drag and aerodynamic heating can cause atmospheric breakup capable of completely disintegrating smaller objects and these forces may cause objects with lower compressive strength to explode. Manned space vehicles must be slowed to subsonic speeds before parachutes or air brakes may be deployed, such vehicles have kinetic energies typically between 50 and 1800 MJoules, and atmospheric dissipation is the only way of expending the kinetic energy. While the high temperature generated at the surface of the shield is due to adiabatic compression. Other smaller energy losses include black body radiation directly from the hot gasses, ballistic warheads and expendable vehicles do not require slowing at re-entry, and in fact, are made streamlined so as to maintain their speed. Uncontrolled, objects accelerate through the atmosphere at extreme velocities under the influence of Earths gravity, most controlled objects enter at hypersonic speeds due to their suborbital, orbital, or unbounded trajectories. Various advanced technologies have developed to enable atmospheric reentry and flight at extreme velocities. Practical development of systems began as the range and reentry velocity of ballistic missiles increased. For early short-range missiles, like the V-2, stabilization and aerodynamic stress were important issues, medium-range missiles like the Soviet R-5, with a 1200 km range, required ceramic composite heat shielding on separable reentry vehicles. The first ICBMs, with ranges of 8000 to 12,000 km, were possible with the development of modern ablative heat shields. In the U. S. this technology was pioneered by H. Julian Allen at Ames Research Center, over the decades since the 1950s, a rich technical jargon has grown around the engineering of vehicles designed to enter planetary atmospheres. It is recommended that the review the jargon glossary before continuing with this article on atmospheric reentry. When atmospheric entry is part of a landing or recovery, particularly on a planetary body other than Earth, entry is part of a phase referred to as entry, descent and landing. When the atmospheric entry returns to the body that the vehicle had launched from. These four shadowgraph images represent early reentry-vehicle concepts, if the reentry vehicle is made blunt, air cannot get out of the way quickly enough, and acts as an air cushion to push the shock wave and heated shock layer forward. Since most of the hot gases are no longer in contact with the vehicle. The Allen and Eggers discovery, though initially treated as a secret, was eventually published in 1958
Atmospheric reentry
–
Mars Exploration Rover (MER)
aeroshell, artistic rendition
Atmospheric reentry
–
Apollo Command Module flying at a high
angle of attack for lifting entry, artistic rendition.
Atmospheric reentry
–
Prototype of the Mk-2 Reentry Vehicle (RV), based on blunt body theory
Atmospheric reentry
–
Galileo Probe during final assembly
23.
Improvised explosive device
–
An improvised explosive device is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional explosives, such as an artillery round. IEDs are commonly used as roadside bombs, IEDs are generally seen in heavy terrorist actions or in unconventional warfare by guerrillas or commando forces in a theater of operations. In the second Iraq War, IEDs were used extensively against US-led invasion forces and they are also used in Afghanistan by insurgent groups, and have caused over 66% of coalition casualties in the 2001–present Afghanistan War. IEDs were also used extensively by cadres of the rebel Tamil Tiger organization against military targets in Sri Lanka, an IED is a bomb fabricated in an improvised manner incorporating destructive, lethal, noxious, pyrotechnic, or incendiary chemicals and designed to destroy or incapacitate personnel or vehicles. In some cases, IEDs are used to distract, disrupt, or delay an opposing force, IEDs may incorporate military or commercially sourced explosives, and often combine both types, or they may otherwise be made with homemade explosives. An IED has five components, a switch, an initiator, container, charge, an IED designed for use against armoured targets such as personnel carriers or tanks will be designed for armour penetration, by using a shaped charge that creates an explosively formed penetrator. IEDs are extremely diverse in design and may contain many types of initiators, detonators, penetrators, antipersonnel IEDs typically also contain fragmentation-generating objects such as nails, ball bearings or even small rocks to cause wounds at greater distances than blast pressure alone could. IEDs are triggered by various methods, including remote control, infrared or magnetic triggers, in some cases, multiple IEDs are wired together in a daisy chain to attack a convoy of vehicles spread out along a roadway. IEDs made by inexperienced designers or with substandard materials may fail to detonate, the sophistication of an IED depends on the training of the designer and the tools and materials available. IEDs may use artillery shells or conventional high-explosive charges as their explosive load as well as homemade explosives, chlorine liquid has been added to IEDs in Iraq, producing clouds of chlorine gas. A vehicle-borne IED, or VBIED, is a term for a car bomb or truck bomb but can be any type of transportation such as a bicycle, motorcycle, donkey. They are typically employed by insurgents, and can carry a large payload. They can also be detonated from a remote location, vBIEDs can create additional shrapnel through the destruction of the vehicle itself and use vehicle fuel as an incendiary weapon. The act of a persons being in this vehicle and detonating it is known as an SVBIED suicide, the fougasse was improvised for centuries, eventually inspiring factory-made land mines. Ernst Jünger mentions in his war memoir the systematic use of IEDs, another early example of coordinated large-scale use of IEDs was the Belarusian Rail War launched by Belarusian guerrillas against the Germans during World War II. Both command-detonated and delayed-fuse IEDs were used to derail thousands of German trains during 1943–1944, starting six months before the invasion of Afghanistan by the USSR on 27 December 1979, the Afghan Mujahideen were supplied with large quantities of military supplies. Among those supplies were many types of anti-tank mines, the insurgents often removed the explosives from several foreign anti-tank mines, and combined the explosives in tin cooking-oil cans for a more powerful blast
Improvised explosive device
–
Ammunition rigged for an IED discovered by
Iraqi police in Baghdad in November 2005
Improvised explosive device
–
This
Cougar in Al Anbar, Iraq, was hit by a directed charge IED approximately 300–500 lbs in size.
Improvised explosive device
–
A
portable X-ray generator and a portable
flat panel detector are used to inspect a suspicious carrying case.
Improvised explosive device
–
U.S. Marines with Explosive Ordnance Disposal (EOD) destroy an Improvised Explosive Device (IED) cache in southern
Afghanistan in June 2010.
24.
Guerrilla warfare
–
The term, the diminutive form of war in Spanish, is usually translated as little war, and the word, guerrilla, has been used to refer to the concept since the 18th century, and perhaps earlier. In correct Spanish usage, a person who is a member of a guerrilla is a guerrillero if male, the term guerrilla was used in English as early as 1809, to refer to the fighters, and also to denote a group or band of such fighters. However, in most languages guerrilla still denotes the style of warfare. The use of the diminutive evokes the differences in number, scale, guerrillas usually carries positive connotations, and is often used by such fighters themselves and by their sympathizers, while their foes in many cases call them terrorists. Making an objective definition of the difference between a guerrilla and a terrorist has proven a difficult task, the strategy and tactics of guerrilla warfare tend to focus around the use of a small, mobile force competing against a larger, more unwieldy one. The Guerrilla focuses on organizing in small units, depending on the support of the local population, tactically, the guerrilla army would avoid any confrontation with large units of enemy troops, but seek and eliminate small groups of soldiers to minimize losses and exhaust the opposing force. Not limiting their targets to personnel, enemy resources are preferred targets. All of that is to weaken the strength, to cause the enemy eventually to be unable to prosecute the war any longer. It is often misunderstood that guerrilla warfare must involve disguising as civilians to cause enemy troops to fail in telling friend from foe, however, this is not a primary feature of a guerrilla war. This type of war can be practiced anywhere there are places for combatants to cover themselves, at least one author credits the ancient Chinese work The Art of War with providing instruction in such tactics to Mao. The Chinese general and strategist Sun Tzu, in his The Art of War or 600 BC to 501 BC, was the earliest to propose the use of guerrilla warfare and this directly inspired the development of modern guerrilla warfare. Guerrilla tactics were employed by prehistoric tribal warriors against enemy tribes. Evidence of conventional warfare, on the hand, did not emerge until 3100 BC in Egypt. Since the Enlightenment, ideologies such as nationalism, liberalism, socialism, because of the innovative tactics he used during his command, he made himself the name of Terror Romanorum. A counter-insurgency or counterinsurgency operation involves actions taken by the government of a nation to contain or quell an insurgency taken up against it. Counter-insurgency operations are common during war, occupation and armed rebellions, the two most influential of scholars of counter-insurgency have been Westerners whose job it had been to fight insurgents. Robert Thompson fought during the Malayan Emergency and David Galula fought during the Algerian War, together these officers advocated multi-pronged strategies to win over the civilian population to the side of the counter-insurgent. The widely distributed and influential work of Sir Robert Thompson, counter-insurgency expert of the Malayan Emergency, thompsons underlying assumption was that the counter-insurgent was committed to improving the rule of law and bettering local governance
Guerrilla warfare
–
Spanish guerrilla resistance to the French invasion in 1808
Guerrilla warfare
–
Boer guerrillas during the
Second Boer War in South Africa
Guerrilla warfare
–
Female Soviet partisans operating under
Sydir Kovpak in
German-occupied Ukraine
Guerrilla warfare
–
Mass shootings of
Vendée royalist rebels in western France, 1793
25.
Bomb disposal
–
Bomb disposal is the process by which hazardous explosive devices are rendered safe. Bomb disposal does not encompass the remediation of soils polluted with explosive materials, the first professional civilian bomb squad was established by Sir Vivian Dering Majendie. In 1875, he framed The Explosives Act, the first modern legislation for explosives control and he also pioneered many bomb disposal techniques, including remote methods for the handling and dismantling of explosives. His advice during the Fenian dynamite campaign of 1881-85 was officially recognised as having contributed to the saving of lives, after Victoria Station was bombed on 26 February 1884 he defused a bomb with a clockwork mechanism which might have gone off at any moment. The New York City Police Department established its first bomb squad in 1903, known as the Italian Squad, its primary mission was to deal with dynamite bombs used by the Mafia to intimidate immigrant Italian merchants and residents. It would later be known as the Anarchist Squad and the Radical Squad, Bomb Disposal became a formalized practice in the First World War. The swift mass production of munitions led to manufacturing defects. These were hazardous to attacker and defender alike, in response, the British dedicated a section of Ordnance Examiners from the Royal Army Ordnance Corps to handle the growing problem. In 1918, the Germans developed delayed-action fuzes that would develop into more sophisticated versions during the 1930s. These tests led to the development of UXBs, pioneered by Herbert Ruehlemann of Rheinmetall, such delayed-action bombs provoked terror in the civilian population because of the uncertainty of time, and also complicated the task of disarming them. The Germans saw that unexploded bombs caused far more chaos and disruption than bombs that exploded immediately and this caused them to increase their usage of delayed-action bombs in World War II. This trend of cat-and-mouse extends even to the present day, modern EOD Technicians across the world can trace their heritage to the Blitz, when the United Kingdoms cities were subjected to extensive bombing raids by Nazi Germany. In addition to air raids, unexploded bombs took their toll on population and morale, paralyzing vital services. Bombs fitted with delayed-action fuzes provoked fear and uncertainty in the civilian population, the first UXBs were encountered in the autumn of 1939 before the Blitz and were for the most part easily dealt with, mostly by Royal Air Force or Air Raid Precautions personnel. In the spring of 1940, when the Phony War ended,25 sections were authorized for the Royal Engineers in May 1940, another 109 in June, and 220 by August. Organization was needed, and as the Blitz began,25 Bomb Disposal Companies were created between August 1940 and January 1941, each company had ten sections, each section having a bomb disposal officer and 14 other ranks to assist. Six companies were deployed in London by January 1941, Bomb fuzes incorporating anti-handling devices were specifically designed to kill bomb disposal personnel. Scientists and technical staff responded by devising methods and equipment to render them safe, the next year, the Office of Civilian Defense and War Department both sponsored a bomb disposal program
Bomb disposal
–
"The long walk": A
British Army ATO approaches a suspect device in
Northern Ireland
Bomb disposal
–
A British NCO prepares to dispose of an unexploded bomb, during the First World War.
Bomb disposal
–
A bomb disposal team in 1940.
Bomb disposal
–
Marines conducting a controlled detonation of
improvised explosive devices in
Afghanistan.
26.
Hostage
–
A hostage is a person or entity which is held by one of two belligerent parties to the other or seized as security for the carrying out of an agreement, or as a preventive measure against war. A person who seizes one or more hostages is known as a hostage-taker, if the hostages are present voluntarily, then the receiver is known as a host. These obligations would be in the form of signing of a peace treaty and this would eventually influence them culturally and open the way for an amicable political line if they ascended to power after release. This caused the element gīsl = hostage in many old Germanic personal names, the practice was also commonplace in the Imperial Chinese tributary system, especially between the Han and Tang dynasties. The practice continued through the early Middle Ages, the Irish High King Niall of the Nine Hostages got his epithet Noígiallach because, by taking nine petty kings hostage, he had subjected nine other principalities to his power. This practice was adopted in the early period of the British occupation of India. The practice of taking hostages as security for the out of a treaty between civilized states is now obsolete. In France, after the revolution of Prairial, the law of hostages was passed. Relatives of émigrés were taken from disturbed districts and imprisoned, and were liable to execution at any attempt to escape. Sequestration of their property and deportation from France followed on the murder of a republican, four to every such murder, the law only resulted in an increase in the insurrection. Napoleon in 1796 had used similar measures to deal with the insurrection in Lombardy, another case where hostages have been taken in modern warfare has been the subject of much discussion. The measure seems to have been effective, in 1900 during the Second Boer War, by a proclamation issued at Pretoria, Lord Roberts adopted the plan for a similar reason, but shortly afterwards it was abandoned. The Germans also, between the surrender of a town and its occupation, took hostages as security against outbreaks of violence by the inhabitants. It may be noticed, however, that the hostages would suffer should the acts aimed at be performed by the authorized belligerent forces of the enemy, the regulations, however do not allude to the practice of taking hostage. In May 1871, at the close of the Paris Commune and it was an act of maniacal despair, on the defeat at Mont Valrien on the 4 April and the entry of the army into Paris on the 21 May. Taking hostages is today considered a crime or an act of terrorism, the criminal activity is known as kidnapping. An acute situation where hostages are kept in a building or a vehicle that has taken over by armed terrorists or common criminals is often called a hostage crisis. Common Article 3 of the 1949 Geneva Conventions states that the taking of hostages during a conflict is a war crime and shall remain prohibited at any time
Hostage
–
Police often train to recover hostages taken by force, as in this exercise
Hostage
–
"Hostages", 1896 painting by
Jean-Paul Laurens, Musée des Beaux-Arts, Lyon.
Hostage
–
German announcement of the execution of 100 Polish hostages as revenge for death of 2 Germans in Warsaw,
occupied Poland, February 1944
Hostage
–
A British armoured railway wagon behind a railcar on which two Arab hostages are seated, 1936.
27.
Sonar decoy
–
A sonar decoy is a device for decoying sonar. Most are released from submarines to act as a false target, the first submarine decoys were the German Bold fitted to U-boats of World War II. These were a pellet of calcium hydride in a metal container. On contact with sea water, the calcium hydride decomposed to produce a trail of gas bubbles that acted as a bubble curtain. The container trapped hydrogen and floated, with a crude spring valve to maintain buoyancy to keep it at a constant depth, later decoys, such as Sieglinde, were motorised and could deploy their false target away from the host submarine, increasing safety. Decoys were also used by ships to decoy the developing acoustic torpedoes. These were usually towed behind the host, reflective bubble targets Bold or Pillenwerfer. Also used by the US as FXR and the Canadians as CAT, t-Mk 6 Fanfare, US development of Foxer Sonar decoys
Sonar decoy
–
Bold decoy pellet
Sonar decoy
–
Bold launch tube, in the stern compartment of a
type XXI U-boat
28.
Receptor (biochemistry)
–
In biochemistry and pharmacology, a receptor is a protein molecule that receives chemical signals from outside a cell. When such chemical signals bind to a receptor, they cause some form of cellular/tissue response, however, sometimes in pharmacology, the term is also used to include other proteins that are drug targets, such as enzymes, transporters and ion channels. Receptor proteins can be classified by their location, transmembrane receptors include ion channel-linked receptors, G protein-linked hormone receptors, and enzyme-linked hormone receptors. Intracellular receptors are found inside the cell, and include cytoplasmic receptors. The endogenously designated -molecule for a receptor is referred to as its endogenous ligand. E. g. the endogenous ligand for the acetylcholine receptor is acetylcholine but the receptor can also be activated by nicotine. Each receptor is linked to a specific cellular biochemical pathway, while numerous receptors are found in most cells, each receptor will only bind with ligands of a particular structure, much like how locks will only accept specifically shaped keys. When a ligand binds to its receptor, it activates or inhibits the receptors associated biochemical pathway. The ligand-binding cavities are located at the interface between the subunits, type 2, G protein-coupled receptors – This is the largest family of receptors and includes the receptors for several hormones and slow transmitters e. g. dopamine, metabotropic glutamate. They are composed of seven transmembrane alpha helices, the loops connecting the alpha helices form extracellular and intracellular domains. The aforementioned receptors are coupled to different intracellular effector systems via G proteins, the insulin receptor is an example. Type 4, Nuclear receptors – While they are called nuclear receptors, they are located in the cytoplasm. They are composed of a C-terminal ligand-binding region, a core DNA-binding domain, the core region has two zinc fingers that are responsible for recognizing the DNA sequences specific to this receptor. The N terminus interacts with other transcription factors in a ligand-independent manner. Steroid and thyroid-hormone receptors are examples of such receptors, membrane receptors may be isolated from cell membranes by complex extraction procedures using solvents, detergents, and/or affinity purification. The structures and actions of receptors may be studied by using methods such as X-ray crystallography, NMR, circular dichroism. Computer simulations of the behavior of receptors have been used to gain understanding of their mechanisms of action. Ligand binding is an equilibrium process, ligands bind to receptors and dissociate from them according to the law of mass action
Receptor (biochemistry)
–
1.
Ligands 2. Receptors 3.
Secondary Messengers These are examples of
membrane receptors.
29.
Ribonucleic acid
–
Ribonucleic acid is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes. RNA and DNA are nucleic acids, and, along with proteins and carbohydrates, like DNA, RNA is assembled as a chain of nucleotides, but unlike DNA it is more often found in nature as a single-strand folded onto itself, rather than a paired double-strand. Cellular organisms use messenger RNA to convey information that directs synthesis of specific proteins. Many viruses encode their genetic information using an RNA genome, some RNA molecules play an active role within cells by catalyzing biological reactions, controlling gene expression, or sensing and communicating responses to cellular signals. One of these processes is protein synthesis, a universal function where RNA molecules direct the assembly of proteins on ribosomes. This process uses transfer RNA molecules to deliver amino acids to the ribosome, analysis of these RNAs has revealed that they are highly structured. Unlike DNA, their structures do not consist of long double helices, in this fashion, RNAs can achieve chemical catalysis. For instance, determination of the structure of the enzyme that catalyzes peptide bond formation—revealed that its active site is composed entirely of RNA. Each nucleotide in RNA contains a sugar, with carbons numbered 1 through 5. A base is attached to the 1 position, in general, adenine, cytosine, guanine, adenine and guanine are purines, cytosine and uracil are pyrimidines. A phosphate group is attached to the 3 position of one ribose, the phosphate groups have a negative charge each, making RNA a charged molecule. The bases form hydrogen bonds between cytosine and guanine, between adenine and uracil and between guanine and uracil, however, other interactions are possible, such as a group of adenine bases binding to each other in a bulge, or the GNRA tetraloop that has a guanine–adenine base-pair. An important structural feature of RNA that distinguishes it from DNA is the presence of a group at the 2 position of the ribose sugar. The A-form geometry results in a deep and narrow major groove. RNA is transcribed with only four bases, but these bases, pseudouridine, in which the linkage between uracil and ribose is changed from a C–N bond to a C–C bond, and ribothymidine are found in various places. Another notable modified base is hypoxanthine, a deaminated adenine base whose nucleoside is called inosine, inosine plays a key role in the wobble hypothesis of the genetic code. The specific roles of many of these modifications in RNA are not fully understood, the functional form of single-stranded RNA molecules, just like proteins, frequently requires a specific tertiary structure. The scaffold for this structure is provided by secondary structural elements that are hydrogen bonds within the molecule and this leads to several recognizable domains of secondary structure like hairpin loops, bulges, and internal loops
Ribonucleic acid
–
Secondary structure of a
telomerase RNA.
Ribonucleic acid
–
A hairpin loop from a pre-mRNA. Highlighted are the
nucleobases (green) and the ribose-phosphate backbone (blue). Note that this is a single strand of RNA that folds back upon itself.
Ribonucleic acid
–
Robert W. Holley, left, poses with his research team.
30.
Protein folding
–
It is the physical process by which a polypeptide folds into its characteristic and functional three-dimensional structure from random coil. Each protein exists as a polypeptide or random coil when translated from a sequence of mRNA to a linear chain of amino acids. This polypeptide lacks any stable three-dimensional structure, as the polypeptide chain is being synthesized by the ribosome, the linear chain begins to fold into its three dimensional structure. Folding begins to occur even during translation of the polypeptide chain, amino acids interact with each other to produce a well-defined three-dimensional structure, the folded protein, known as the native state. The resulting three-dimensional structure is determined by the amino acid sequence or primary structure, the energy landscape describes the folding pathways in which the unfolded protein is able to assume its native state. Experiments beginning in the 1980s indicate the codon for an acid can also influence protein structure. The correct three-dimensional structure is essential to function, although parts of functional proteins may remain unfolded. Failure to fold into native structure generally produces inactive proteins, several neurodegenerative and other diseases are believed to result from the accumulation of amyloid fibrils formed by misfolded proteins. Many allergies are caused by folding of some proteins, because the immune system does not produce antibodies for certain protein structures. The primary structure of a protein, its linear amino-acid sequence, the amino acid composition is not as important as the sequence. The essential fact of folding, however, remains that the amino acid sequence of protein contains the information that specifies both the native structure and the pathway to attain that state. This is not to say that nearly identical amino acid sequences always fold similarly, conformations differ based on environmental factors as well, similar proteins fold differently based on where they are found. Formation of a structure is the first step in the folding process that a protein takes to assume its native structure. Formation of intramolecular hydrogen bonds provides another important contribution to protein stability, alpha helices are formed by hydrogen bonding of the backbone to form a spiral shape. The beta pleated sheet is a structure forms with the backbone bending over itself to form the hydrogen bonds. The hydrogen bonds are between the hydrogen and carbonyl carbon of the peptide bond. The alpha helices and beta pleated sheets can be amphipathic in nature, or contain a hydrophilic portion, secondary structure hierarchically gives way to tertiary structure formation. Tertiary structure of a protein involves a single chain, however
Protein folding
–
Results of protein folding.
