document_title: Plate armour

question_text: how much does a suit of plate armor weigh

text: Plate armour

text: Early history[edit]

text: Partial plate armour, which protected the chest and the lower limbs, was used by the ancient Greeks (muscle cuirass) and Romans (lorica segmentata), but it fell into disuse after the collapse of the Roman Empire because of the cost and work involved in producing a piece of metal plate or cuirass. Parthian and Sassanian heavy cavalry units known as Clibanarii used cuirasses and small, overlapping plates in the manner of the manica for the protection of arms and legs.

text: Single plates of metal armour were again used from the late 13th century on, to protect joints and shins, and these were worn over a mail hauberk. Gradually the number of plate components of medieval armour increased, protecting further areas of the body, and in barding those of a cavalryman's horse. Armourers developed skills in articulating the lames or individual plates for parts of the body that needed to be flexible, and in fitting armour to the individual wearer like a tailor. The cost of a full suit of high quality fitted armour, as opposed to the cheaper munition armour (equivalent of ready-to-wear) was enormous, and inevitably restricted to the wealthy who were seriously committed to either soldiering or jousting. The rest of an army wore inconsistent mixtures of pieces, with maille still playing an important part.

text: Late Middle Ages[edit]

text: By about 1420, complete suits of plate armour had been developed. A full suit of plate armour would have consisted of a helmet, a gorget (or bevor), pauldrons with gardbraces in Italian and French armour to cover the armpits, or besagews (also known as rondels) which were mostly used in Gothic Armour, couters, vambraces, gauntlets, a cuirass (back and breastplate) with a fauld, tassets and a culet, a mail skirt, cuisses, poleyns, greaves, and sabatons. The very fullest sets, known as garnitures, more often made for jousting than war, included pieces of exchange, alternate pieces suiting different purposes, so that the suit could be configured for a range of different uses, for example fighting on foot or on horse.

text: A complete suit of plate armour made from well-tempered steel would weigh around 15–25 kg.[2] The wearer remained highly agile and could jump, run and otherwise move freely as the weight of the armour was spread evenly throughout the body. The armour was articulated and covered a man's entire body completely from neck to toe. In the 15th and 16th centuries plate armored soldiers were the nucleus of every army. Large bodies of men-at-arms numbering thousands or even more than ten thousand men (approximately 60% to 70% of French armies were men at arms and the percentage was also big in other countries) were fighting on foot wearing full plate next to archers and crossbowmen[citation needed]. This was commonly seen in the Western European armies especially of France and England during the Hundred Years War, the Wars of the Roses or the Italian Wars.[citation needed]

text: European leaders in armouring techniques were northern Italians, especially from Milan, and southern Germans, who had somewhat different styles. But styles were diffused around Europe, often by the movement of armourers; the Renaissance Greenwich armour was made by a royal workshop near London that had imported Italian, Flemish and (mostly) German craftsmen, though it soon developed its own unique style. Ottoman Turkey also made wide use of plate armour but incorporated large amounts of mail into their armour, which was widely used by shock troops such as the Janissary Corps.

text: Effect on weapon development[edit]

text: Plate armour was virtually invulnerable to sword slashes. It also protected the wearer well against spear or pike thrusts and provided decent defense against blunt trauma.

text: The evolution of plate armour also triggered developments in the design of offensive weapons. While this armour was effective against cuts or blows, their weak points could be exploited by long tapered swords or other weapons designed for the purpose, such as pollaxes and halberds. The effect of arrows and bolts is still a point of contention with regard to plate armour. The evolution of the 14th-century plate armour also triggered the development of various polearms. They were designed to deliver a strong impact and concentrate energy on a small area and cause damage through the plate. Maces, war hammers and the hammer-heads of pollaxes (poleaxes) were used to inflict blunt trauma through armour. Strong blows to the head might result in concussion even if the armor is not penetrated.

text: Fluted plate was not only decorative, but also reinforced the plate against bending under slashing or blunt impact. This offsets against the tendency for flutes to catch piercing blows. In armoured techniques taught in the German school of swordsmanship, the attacker concentrates on these "weak spots", resulting in a fighting style very different from unarmoured sword-fighting. Because of this weakness most warriors wore a mail shirt (haubergeon or hauberk) beneath their plate armour (or coat-of-plates). Later, full mail shirts were replaced with mail patches, called gussets, sewn onto a gambeson or arming jacket. Further protection for plate armour was the use of small round plates called besagews that covered the armpit area and couters and poleyns with "wings" to protect the inside of the joint.

text: Renaissance[edit]

text: German so-called Maximilian armour of the early 16th century is a style using heavy fluting and some decorative etching, as opposed to the plainer finish on 15th-century white armour. The shapes include influence from Italian styles. This era also saw the use of closed helms, as opposed to the 15th-century-style sallets and barbutes.[citation needed] During the early 16th century the helmet and neckguard design was reformed to produce the so-called Nürnberg armour, many of them masterpieces of workmanship and design.[3]

text: As firearms became better and more common on the battlefield the utility of full armour gradually declined, and full suits became restricted to those made for jousting which continued to develop. The decoration of fine armour greatly increased in the period, using a whole range of techniques, and further greatly increasing the cost. Elaborately decorated plate armour for royalty and the very wealthy was being produced. Highly decorated armour is often called parade armour, a somewhat misleading term as such armour might well be worn on active military service. Steel plate armour for Henry II of France made in 1555 is covered with meticulous embossing, which has been subjected to blueing, silvering and gilding.[4]

text: Such work required armourers to either collaborate with artists or have artistic skill of their own; another alternative was to take designs from ornament prints and other prints, as was often done. Daniel Hopfer was an etcher of armour by training, who developed etching as a form of printmaking. Other artists such as Hans Holbein the Younger produced designs for armour. The Milanese armourer Filippo Negroli, from a leading dynasty of armourers, was the most famous modeller of figurative relief decoration on armour.

text: A partial exception to the declining protection offered by armour came in the Age of Discovery as Europeans encountered the natives of parts of the world still without firearms. The Spanish Conquistadors found armour extremely practical and (for both horses and men) intimidating to the Amerindians, and in the early North American Colonial period some pieces of armour, especially breastplates and helmets, continued to be worn.

text: Infantry[edit]

text: Reduced plate armour, typically consisting of a breastplate, a burgonet, morion or cabasset and gauntlets, however, also became popular among 16th-century mercenaries and there are many references to so-called munition armour being ordered for infantrymen at a fraction of the cost of full plate armour. This mass-produced armour was often heavier and made of lower quality metal than fine armour for commanders.[5]

text: Jousting[edit]

text: Specialised jousting armour produced in the late 15th to 16th century was heavier, and could weigh as much as 50 kg, as it was not intended for free combat, it did not need to permit free movement, the only limiting factor being the maximum weight that could be carried by a warhorse of the period.

text: The medieval joust has its origins in the military tactics of heavy cavalry during the High Middle Ages. These became obsolete during the 14th century, and since the 15th century, jousting had become a sport (hastilude) without direct relevance to warfare. During the 1490s, emperor Maximilian I invested a lot of effort into perfecting the sport, for which he received his nickname of "The Last Knight". Rennen and Stechen were two sportive forms of the joust developed during the 15th century and practiced throughout the 16th century. The armours used for these two respective styles of the joust was known as Rennzeug and Stechzeug, respectively. The Stechzeug in particular developed into extremely heavy armour which completely inhibited the movement of the rider, in its latest forms resembling an armour-shaped cabin integrated into the horse armour more than a functional suit of armour. Such forms of sportive equipment during the final phase of the joust in 16th-century Germany gave rise to modern misconceptions about the heaviness or clumsiness of "medieval armour", as notably popularised by Mark Twain's A Connecticut Yankee in King Arthur's Court.[6][7] The extremely heavy helmets of the Stechzeug are explained by the fact that the aim was to detach the crest of the opponent's helmet, resulting in frequent full impact of the lance to the helmet.

text: By contrast the Rennen was a type of joust with lighter contact. Here, the aim was to hit the opponent's shield. The specialised Rennzeug was developed on the request of Maximilian, who desired a return to a more agile form of joust compared to the heavily armoured "full contact" Stechen. In the Rennzeug, the shield was attached to the armour with a mechanism of springs and would detach itself upon contact.

text:
Stechzeug; note that the parts protecting the lower body and the legs were incorporated as part of the horse armour (not shown).

Rennzeug

Armour designed for the Kolbenturnier, dated to the 1480s. The Kolbenturnier was a late form of the tournament, unlike the joust played with two teams using wooden clubs (Kolben) to hit opponents' helmet crests.

tag: ul

text: Early Modern period[edit]

text: Plate armour was widely used by most armies until the end of the 17th century for both foot and mounted troops such as the cuirassiers, dragoons, demi-lancers and Polish hussars. The infantry armour of the 16th century developed into the Savoyard type of three-quarters armour by 1600.

text: Full plate armour was expensive to produce and remained therefore restricted to the upper strata of society; lavishly decorated suits of armour remained the fashion with 18th-century nobles and generals long after they had ceased to be militarily useful on the battlefield due to the advent of inexpensive muskets.

text: The development of powerful rifled firearms made all but the finest and heaviest armour obsolete. The increasing power and availability of firearms and the nature of large, state-supported infantry led to more portions of plate armour being cast off in favour of cheaper, more mobile troops. Leg protection was the first part to go, replaced by tall leather boots. By the beginning of the 18th century, only field marshals, commanders and royalty remained in full armour on the battlefield, more as a sign of rank than for practical considerations. It remained fashionable for monarchs to be portrayed in armour during the first half of the 18th century (late Baroque period), but even this tradition became obsolete. Thus, a portrait of Frederick the Great in 1739 still shows him in armour, while a later painting showing him as a commander in the Seven Years' War (1760s) depicts him without armour.

text: Body armour remained in use with cuirassiers throughout the 19th century and into the early phase of World War I. The cuirass represents the final stage of the tradition of plate armour descended from the late medieval period. Meanwhile, makeshift steel armour against shrapnel and early forms of ballistic vests began to be developed from the mid 19th century.

text: Japan[edit]

text: In Kofun period Japan, during the 4th and 5th centuries, very advanced iron plate cuirasses called tanko and helmets were made.[8] Plate armour was used in Japan during the Nara period (646-793), both plate and lamellar armours have been found in burial mounds and haniwa (ancient clay figures) have been found depicting warriors wearing full armour.[8]

text: In Japan the warfare of the Sengoku period (15th and 16th centuries) required large quantities of armour to be produced for the ever-growing armies of foot soldiers (ashigaru). Simple munition-quality[9] chest armours (dō) and helmets (kabuto) were mass-produced.

text: In 1543, the Portuguese brought matchlock firearms (tanegashima) to Japan.[10] The Japanese started to manufacture the Portuguese acquired matchlocks and the use of these firearms in warfare caused the gradual decline in the use of the centuries-old lamellar armour that the samurai were known for; the Japanese armour makers started to use solid iron plates in their armour designs which were based on European armours,[11] and eventually plate armour became the standard for samurai warriors.[12][13] The new style Japanese plate armours were called tosei gusoku (new armours) in order to differentiate from the old style lamellar armours.[14] Japanese armour makers designed bulletproof plate armours called tameshi gusoku or (bullet tested), which allowed soldiers to continue wearing armour despite the heavy use of firearms in the late 1500s.[15][16]

text: In the 1600s warfare in Japan came to an end but the samurai continued to use plate armour until the end of the samurai era in the 1860s, with the known last use of samurai armour occurring in 1877 during the Satsuma rebellion.[17]

text: Modern body armour[edit]

text: The cavalry armour of Napoleon, and the French, German, and British empires (heavy cavalry known as cuirassiers) were actively used through the 19th century right up to the first year of World War I, when French cuirassiers went to meet the enemy in armour outside of Paris.

text: Body armour made a brief reappearance in the American Civil War with mixed success. During World War I, both sides experimented with shrapnel armour and some soldiers used their own dedicated ballistic armour such as the American Brewster Body Shield, although none were widely produced. In 1916 General Adrian of the French army provided an abdominal shield which was light in weight (approx. one kilogram) and easy to wear.[18] A number of British officers recognised that many casualties could be avoided if effective armour were available. .[19]

text: The first usage of the term "flak jacket" refers to the armour originally developed by the Wilkinson Sword company during World War II to help protect Royal Air Force (RAF) air personnel from the flying debris and shrapnel.The Red Army also made use of ballistic steel body armour, typically chestplates, for combat engineers and assault infantry.[20]

text: After World War II, steel plates were soon replaced by vests made from synthetic fibre, in the 1950s, made of either boron carbide, silicon carbide, or aluminium oxide. They were issued to the crew of low-flying aircraft, such as the UH-1 and UC-123, during the Vietnam War.[21][22] The synthetic fibre Kevlar was introduced in 1971, and most ballistic vests since the 1970s are based on kevlar, optionally with the addition of trauma plates to reduce the risk of blunt trauma injury. Such plates may be made of ceramic, metal (steel or titanium) or synthetic materials.


document_title: Biltmore Estate

question_text: who was the last person to live in biltmore house

root

text: Biltmore Estate

text: History[edit]

text: In the 1880s, at the height of the Gilded Age, George Washington Vanderbilt II, youngest son of William Henry Vanderbilt, began to make regular visits with his mother, Maria Louisa Kissam Vanderbilt (1821–1896),  to the Asheville, North Carolina, area. He loved the scenery and climate so much that he decided to create his own summer estate in the area, which he called his "little mountain escape", just as his older brothers and sisters had built opulent summer houses in places such as Newport, Rhode Island, and Hyde Park, New York. Vanderbilt named his estate Biltmore derived from "Bildt," Vanderbilt's ancestors' place of origin in Holland, and "More", Anglo-Saxon for open, rolling land.[3] A portion of the estate was once the community of Shiloh.[4] Vanderbilt bought almost 700 parcels of land, including over 50 farms and at least five cemeteries. A spokesperson for the estate said in 2017 that archives show much of the land "was in very poor condition, and many of the farmers and other landowners were glad to sell."[5]

tag: p

text: Construction of the house began in 1889 and continued well into 1896. In order to facilitate such a large project, a woodworking factory and brick kiln, which produced 32,000 bricks a day, were built onsite, and a three-mile railroad spur was constructed to bring materials to the building site. Construction on the main house required the labor of well over 1,000 workers and 60 stonemasons.[6] Vanderbilt went on extensive buying trips overseas as construction on the house was in progress. He returned to North Carolina with thousands of furnishings for his newly built home including tapestries, hundreds of carpets, prints, linens, and decorative objects, all dating between the 15th century and the late 19th century. Among the few American-made items were the more practical oak drop-front desk, rocking chairs, a walnut grand piano, bronze candlesticks and a wicker wastebasket.[7]

text: George Vanderbilt opened his opulent estate on Christmas Eve 1895 to invited family and friends from across the country, who were encouraged to enjoy leisure and country pursuits. Notable guests to the estate over the years included author Edith Wharton, novelist Henry James, ambassadors Joseph Hodges Choate and Larz Anderson, and Presidents William McKinley, Theodore Roosevelt, Woodrow Wilson, Jimmy Carter, Ronald Reagan, and Barack Obama. George married Edith Stuyvesant Dresser in 1898 in Paris, France; their only child, Cornelia Stuyvesant Vanderbilt, was born at Biltmore in the Louis XV room in 1900, and grew up at the estate.

text: Driven by the impact of the newly imposed income taxes, and the fact that the estate was getting harder to manage economically, Vanderbilt initiated the sale of 87,000 acres (352 km²) to the federal government. After Vanderbilt's unexpected death in 1914 of complications from an emergency appendectomy, his widow completed the sale to carry out her husband's wish that the land remain unaltered, and that property became the nucleus of the Pisgah National Forest.[6] Overwhelmed with running such a large estate, Edith began consolidating her interests and sold Biltmore Estate Industries in 1917 and Biltmore Village in 1921. Edith intermittently occupied the house, living in an apartment carved out of the former Bachelors' Wing, until the marriage of her daughter to John Francis Amherst Cecil in April 1924. The Cecils went on to have two sons who were born in the same room as their mother.

text: In an attempt to bolster the estate's financial situation during the Great Depression, Cornelia and her husband opened Biltmore to the public in March 1930 at the request of the City of Asheville, which hoped the attraction would revitalize the area with tourism.[8]  Biltmore closed during World War II and in 1942, 62 paintings and 17 sculptures were moved to the estate by train from the National Gallery of Art in Washington, D.C. to protect them in the event of an attack on the United States. The Music Room on the first floor was never finished, so it was used for storage until 1944, when the possibility of an attack became more remote. Among the works stored were the Gilbert Stuart portrait of George Washington and works by Rembrandt, Raphael, and Anthony van Dyck.  David Finley, the gallery director, was a friend of Edith Vanderbilt and had stayed at the estate.[9]

text: After the divorce of the Cecils in 1934, Cornelia left the estate never to return; however, John Cecil maintained his residence in the Bachelors' Wing until his death in 1954. Their eldest son George Henry Vanderbilt Cecil, occupied rooms in the wing until 1956. At this point Biltmore House ceased to be a family residence and has continued to be operated as a historic house museum.

text:
Younger son William A. V. Cecil, Sr. returned to the estate in the late 1950s and joined his brother to manage the estate when it was in financial trouble and make it a profitable and self-sustaining enterprise like his grandfather envisioned. He eventually inherited the estate upon the death of his mother, Cornelia, in 1976, while his brother, George, inherited the then more profitable dairy farm which was split off into Biltmore Farms. In 1995, while celebrating the 100th anniversary of the estate, Cecil turned over control of the company to his son, William A.V. Cecil, Jr.
[10] The Biltmore Company is privately held and of the 4,306.86 acres that make up Biltmore Estate, only 1.36 acres are in the city limits of Asheville, and the Biltmore House is not part of any municipality.[11]

text: The estate was designated a National Historic Landmark in 1963,[12] and remains a major tourist attraction in Western North Carolina with 1.4 million visitors each year.[10]

text: After the death of William A. V. Cecil in October 2017 and his wife Mimi Cecil in November, their daughter Dini Pickering as board chair and their son Bill Cecil as CEO announced that the estate would continue to be run the same way. The house is assessed at $157.2 million but due to an agricultural deferment, county property taxes are paid on only $79.1 million of that.[10]

text: Architecture[edit]

text: Vanderbilt commissioned prominent New York architect Richard Morris Hunt, who had previously designed houses for various Vanderbilt family members, to design the house in the Châteauesque style, using French Renaissance chateaus that Vanderbilt and Hunt had visited in early 1889, including Château de Blois, Chenonceau and Chambord in France and Waddesdon Manor in England, as inspiration with their steeply pitched roofs, turrets and sculptural ornamentation.[13] Hunt sited the four-story Indiana limestone-built home to face east with a 375-foot facade to fit into the mountainous topography behind. The facade is asymmetrically balanced with two projecting wings connecting to the entrance tower with an open loggia to the left side and a windowed arcade to the right which held the Winter Garden that was fashionable during the Victorian era. The entrance tower contains a series of windows with decorated jambs that extend from the front door to the most decorated dormer at Biltmore on the fourth floor. The carved decorations include trefoils, flowing tracery, rosettes, gargoyles, and at prominent lookouts, grotesques. The staircase is one of the more prominent features of the east facade, with its three-story, highly decorated winding balustrade with carved statues of St. Louis and Joan of Arc by the Austrian-born architectural sculptor Karl Bitter.

text:
External video

 Biltmore, 24:36, C-SPAN[14]

tag: table

text: The south facade has the smallest dimensions for the house and is dominated by three large dormers on the east side and a polygonal turret on the west side. An arbor is attached to the house and is accessed from the library which is located on the ground floor. On the north end of the house, Hunt placed the attached stables, carriage house and its courtyard to protect the house and gardens from the wind. The 12,000-square-foot complex housed Vanderbilt's prized driving horses and the carriage house opposite the stables stored his 20 carriages in addition to any of his guest's carriages.

text: The rear western elevation is less elaborate than the front facade, with some windows not having any decoration at all. Two matching polygonal towers in the center are connected to the polygonal south turret by an open loggia that opens the main rooms of the house to the views of the Blue Ridge Mountains in the distance. The loggia is decorated overhead with terracotta tiles set in a herringbone pattern. The self-supporting ceramic tile vault and arch system was used extensively inside and outside of Biltmore, and was patented by Rafael Guastavino, a Spanish architect and engineer, who personally supervised the installation. The limestone columns were carved to reflect the sunlight in aesthetically pleasing and varied ways per Vanderbilt's wish. The rusticated base is a contrast to the smooth limestone used on the remainder of the house.

text: The steeply pitched roof is punctuated by 16 chimneys and covered with slate tiles that were affixed one by one. Each tile was drilled at the corners and wired onto the attic’s steel infrastructure. Copper flashing was then installed at the junctions to prevent water from penetrating. The fanciful flashing on the ridge of the roof was embossed with George Vanderbilt’s initials and motifs from his family crest, though the original gold leaf no longer survives.[15]

text: Biltmore House had electricity from the time it was built. With electricity less safe and fire more of a danger at the time, the house had six separate sections divided by brick fire walls.[16]

text: Vanderbilt paid little attention to the family business or his own investments and it is believed that the construction and upkeep of Biltmore depleted much of his inheritance.[citation needed]

text: Interiors[edit]

text: First floor[edit]

text:
Biltmore has four acres of floor space and a total of 250 rooms in the house including 35 bedrooms for family and guests, 43 bathrooms, 65 fireplaces, three kitchens and 19th-century novelties such as electric elevators, forced-air heating, centrally controlled clocks, fire alarms, and a call-bell system.[13] The principal rooms of the house are located on the ground floor. To the right of the marbled Entrance Hall, the octagonal, sunken Winter Garden is surrounded by stone archways with a ceiling of architecturally sculptured wood and multifaceted glass. The centerpiece is a marble and bronze fountain sculpture titled Boy Stealing Geese created by Karl Bitter. On the walls just outside the Winter Garden are copies of the Parthenon frieze. The Banquet Hall is the largest room in the house, measuring 42 feet wide and 72 feet long, with a 70-foot-high barrel-vaulted ceiling. The table could seat 64 guests surrounded by rare Flemish tapestries and a triple fireplace that spans one end of the hall. On the opposite end of the hall is an organ gallery that houses a 1916 Skinner pipe organ. Left unfinished with bare brick walls, the Music Room was not completed and opened to the public until 1976. It showcases a mantle designed by Hunt, and a large engraving by Albrecht Dürer called the Triumphal Arch commissioned by Holy Roman Emperor Maximilian I. The mantle had been stored in the stable for over 80 years.
To the left of the entrance hall is the 90-foot-long Tapestry Gallery, which leads to the Library, featuring three 16th-century tapestries representing The Triumph of Virtue Over Vice. Elsewhere on the walls are family portraits by John Singer Sargent, Giovanni Boldini and James Whistler. The two-story Library contains over 10,000 volumes in eight languages, reflecting George Vanderbilt's broad interests in classic literature as well as works on art, history, architecture, and gardening. The second-floor balcony is accessed by an ornate walnut spiral staircase. The baroque detailing of the room is enhanced by the rich walnut paneling and the ceiling painting, The Chariot of Aurora, brought to Biltmore by Vanderbilt from the Palazzo Pisani Moretta in Venice, Italy. The painting by Giovanni Antonio Pellegrini is the most important work by the artist still in existence.[17]

text: Second floor[edit]

text: The second floor is accessed by the cantilevered Grand Staircase of 107 steps spiraling around a four-story, wrought-iron chandelier holding 72 light bulbs.[18] The Second Floor Living Hall is an extension of the grand staircase as a formal hall and portrait gallery, and was restored to its original configuration in 2013. Several large-scale masterpieces are displayed in the hall, including two John Singer Sargent portraits of Biltmore's architect, Richard Morris Hunt, and landscaper, Frederick Law Olmsted, both commissioned for the home by Vanderbilt.[19] Located nearby in the south tower is George Vanderbilt's gilded bedroom with furniture designed by Hunt. His bedroom connects to his wife's Louis XV-style, oval-shaped bedroom in the north tower through a Jacobean carved oak paneled sitting room with an intricate ceiling.

text: The suite of rooms includes the Damask Room; the Claude Room, named after one of Vanderbilt's favorite artists, Claude Lorrain; the Tyrolean Chimney Room; and the most grand, the Louis XV Room, so named due to its architectural scheme and furnishings that were very popular in the late nineteenth century. The suite was restored and opened to the public for the first time in 100 years in 2011.[20]

text: Third and fourth floors[edit]

text: The third floor has a number of guest rooms with names that describe the furnishing or artist that they were decorated with. The fourth floor has 21 bedrooms that were inhabited by housemaids, laundresses, and other female servants. Also included on the fourth floor is an Observatory with a circular staircase that leads to a wrought iron balcony with doorways to the rooftop where Vanderbilt could view his estate. Male servants were not housed here, however, but instead resided in rooms above the stable and complex.[13]

text: Bachelors' wing[edit]

text: The Billiard Room is decorated with an ornamental plaster ceiling and rich oak paneling and was equipped with both a custom-made pool table and a carom table (table without pockets). The room was mainly frequented by men, but ladies were welcome to enter as well. Secret door panels on either side of the fireplace led to the private quarters of the Bachelors’ Wing where female guests and staff members were not allowed. The wing includes the Smoking Room, which was fashionable for country houses, and the Gun Room, which held mounted trophies and displayed George Vanderbilt’s gun collection.[13]

text: Basement[edit]

text: Guests of the estate could enjoy other activities that were found on the basement level, including an indoor 70,000-gallon (265,000-litre and 265-cubic meter) heated swimming pool with underwater lighting, one of the nation's first bowling alleys installed in a private residence, and a gymnasium with once state-of-the-art fitness equipment. The service hub of the house is also found in the largest basement in the US, as the location for the main kitchen, pastry kitchen, rotisserie kitchen, walk-in refrigerators that provided an early form of mechanical refrigeration, the servants' dining hall, laundry rooms and additional bedrooms for staff.

text: Park and landscape[edit]

text: Wanting the best, Vanderbilt envisioned a park-like setting for his home and employed landscape architect Frederick Law Olmsted to design the grounds. However, Olmsted was not impressed with the condition of the 125,000 acres (195 sq mi; 510 km2) and advised for a park surrounding the house, establishing farms along the river and replanting the rest as a commercial timber forest, a plan to which Vanderbilt agreed. Gifford Pinchot and later Carl A. Schenck were hired to manage the forests, with Schenck establishing the first forestry education program in the U.S., the Biltmore Forest School, on the estate grounds in 1898.

text: Another important aspect of the landscaping was the intentionally rustic three-mile (5 km) Approach Road that began at the brick quoined and pebbledash stucco Lodge Gate at the edge of Biltmore Village, and ended at the sphinx-topped stone pillars at the Esplanade. In between, the lane was densely filled with natural and uncultivated looking foliage and shrubbery to provide a relaxing journey for guests.  Olmsted made sure to incorporate 75 acres (30 ha) of formal gardens that had been requested by Vanderbilt for the grounds directly surrounding the house.  He constructed an Italian formal garden, a walled garden, a shrub and rose garden, fountains, and a conservatory with individual rooms for palms and orchids.  There was also a bowling green, an outdoor tea room, and a terrace to incorporate the European statuary that Vanderbilt had brought back from his travels. At the opposite end of the Esplanade is the Rampe Douce, a graduated stairway zigzagging along a rough-cut limestone wall that leads to the grassy slope known as the Vista, topped with a statue of Diana, the goddess of the hunt.[13]

text: Water features were an important aspect of Victorian landscaping and Olmsted incorporated two for the estate: the Bass Pond created from an old creek-fed millpond and the Lagoon. Each was used for guest recreation like fishing and rowing. To supply water for the estate, Olmsted engineered two reservoirs. One was a spring-fed man-made lake on nearby Busbee Mountain. The other was a man-made, brick-lined reservoir, located behind the statue of Diana in the Vista, at an elevation of approximately 266 feet above the Esplanade.[21]

text: Estate[edit]

text: Vanderbilt's idea was to replicate the working estates of Europe. He asked Hunt and Olmsted to design a village with architecturally compatible buildings and picturesque landscaping as a source of income through building rental, a place to help carry out philanthropic programs, and an easy point of access between the estate and the train station.[22] The result was Biltmore Village. The village included rental cottages complete with plumbing and central heating, a post office, shops, doctor's office, school, and a church, known today as the Cathedral of All Souls.[23] Intending that the estate could be self-supporting, Vanderbilt set up scientific forestry programs, poultry farms, cattle farms, hog farms, and a dairy.  His wife, Edith, also enthusiastically supported agricultural reform and promoted the establishment of a state agricultural fair.  In 1901, the Vanderbilts provided financial assistance to Biltmore Industries, started by Biltmore Village resident Eleanor Vance, which taught young people how to make hand-carved furniture, woven baskets, homespun wool fabric, and more.[24]

text: The estate today covers approximately 8,000 acres (13 sq mi; 32 km2) and is split in half by the French Broad River, overseen by The Biltmore Company, a trust set up by the family. The company is a large enterprise that is one of the largest employers in the Asheville area. Restaurants were opened in 1979 and 1987 as well as four gifts shops in 1993. The former dairy barn was converted into the popular Biltmore Winery in 1985. The AAA four-diamond 210-room Inn on Biltmore Estate opened in 2001, and in 2010, the estate debuted Antler Hill Village, as well as a remodeled winery, and connected farmyard.

text: In other media[edit]

text: The Biltmore Estate licenses its name and design elements to a line of housewares, linens, and luggage called "Biltmore For Your Home", marketed exclusively by Belk stores.[25]

text: The house has been featured in "Empires of the Smoky Skies", a scenario in Sid Meier's Civilization V.

text: The estate and its surrounding forest make up the setting of Robert Beatty's 2015 middle-grade novel Serafina and The Black Cloak and its sequels.[26]

text: The grounds and buildings of Biltmore Estate have appeared in a number of major motion pictures and TV series:

text:
Tap Roots (1948)
The Swan (1956)
The Pruitts of Southampton (1966)
Being There (1979)
The Private Eyes (1980)
A Breed Apart (1984)
Mr. Destiny (1990)
The Last of the Mohicans (1992)
Forrest Gump (1994)
Richie Rich (1994)
My Fellow Americans (1996)
Patch Adams (1998)
Return to the Secret Garden (2000)
Hannibal (2001)
One Tree Hill (2003)
The Clearing (2004)
The Odd Life of Timothy Green (2012)
Hannibal (2015)


document_title: History of the periodic table

question_text: who created the periodic table by atomic number

text: History of the periodic table

text: Ancient times[edit]

text: A number of physical elements (such as platinum, tin and zinc) have been known from antiquity, as they are found in their native form and are relatively simple to mine with primitive tools.[3] Around 330 BCE, the Greek philosopher Aristotle proposed that everything is made up of a mixture of one or more roots, an idea that had originally been suggested by the Sicilian philosopher Empedocles. The four roots, which were later renamed as elements by Plato, were earth, water, air and fire. Similar ideas about these four elements also existed in other ancient traditions, such as Indian philosophy. While Aristotle and Plato understood the concept of an element, their ideas did nothing to advance the understanding of the nature of matter.

text: Hennig Brand[edit]

text: The history of the periodic table is also a history of the discovery of the chemical elements. The first person in history to discover a new element was Hennig Brand, a bankrupt German merchant. Brand tried to discover the Philosopher's Stone — a mythical object that was supposed to turn inexpensive base metals into gold. In 1649, his experiments with distilled human urine resulted in the production of a glowing white substance, which he named phosphorus.[4] He kept his discovery secret until 1680, when Robert Boyle rediscovered phosphorus and published his findings. The discovery of phosphorus helped to raise the question of what it meant for a substance to be an element.

text: In 1661, Boyle defined an element as "a substance that cannot be broken down into a simpler substance by a chemical reaction". This simple definition served for three centuries and lasted until the discovery of subatomic particles.

text: Antoine-Laurent de Lavoisier[edit]

text: Lavoisier's Traité Élémentaire de Chimie (Elementary Treatise of Chemistry), which was written in 1789 and first translated into English by the writer Robert Kerr, is considered to be the first modern textbook about chemistry. It contained a list of "simple substances" that Lavoisier believed could not be broken down further, which included oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulfur, which formed the basis for the modern list of elements. Lavoisier's list also included 'light' and 'caloric', which at the time were believed to be material substances. He has classified these substances into metals and non metals. While many leading chemists refused to believe Lavoisier's new revelations, the Elementary Treatise was written well enough to convince the younger generation. However, Lavoisier's descriptions of his elements lack completeness, as he only classified them as metals and non-metals.

text: 19th century[edit]

text: Johann Wolfgang Döbereiner[edit]

text: In 1817, Johann Wolfgang Döbereiner began to formulate one of the earliest attempts to classify the elements. In 1829, he found that he could form some of the elements into groups of three, with the members of each group having related properties. He termed these groups triads.

text: Definition of Triad law:-"Chemically analogous elements arranged in increasing order of their atomic weights formed well marked groups of three called Triads in which the atomic weight of the middle element was found to be generally the arithmetic mean of the atomic weight of the other two elements in the triad.

text:
chlorine, bromine, and iodine
calcium, strontium, and barium
sulfur, selenium, and tellurium
lithium, sodium, and potassium

tag: ol

text: Alexandre-Emile Béguyer de Chancourtois[edit]

text: Alexandre-Emile Béguyer de Chancourtois, a French geologist, was the first person to notice the periodicity of the elements — similar elements occurring at regular intervals when they are ordered by their atomic weights. In 1862 he devised an early form of periodic table, which he named Vis tellurique (the 'telluric helix'), after the element tellurium, which fell near the center of his diagram.[5] With the elements arranged in a spiral on a cylinder by order of increasing atomic weight, de Chancourtois saw that elements with similar properties lined up vertically. His 1863 publication included a chart (which contained ions and compounds, in addition to elements), but his original paper in the Comptes Rendus de l'Académie des Sciences used geological rather than chemical terms and did not include a diagram. As a result, de Chancourtois' ideas received little attention until after the work of Dmitri Mendeleev had been publicised.[6]

text: John Newlands[edit]

text: In 1864, the English chemist John Newlands classified the sixty-two known elements into eight groups, based on their physical properties.[7][8]

text: Newlands noted that many pairs of similar elements existed, which differed by some multiple of eight in mass number, and was the first to assign them an atomic number.[1] When his 'law of octaves' was printed in Chemistry News, likening this periodicity of eights to the musical scale, it was ridiculed by some of his contemporaries. His lecture to the Chemistry Society on 1 March 1866 was not published, the Society defending their decision by saying that such 'theoretical' topics might be controversial[citation needed].

text: The importance of Newlands' analysis was eventually recognised by the Chemistry Society with a Gold Medal five years after they recognised Mendeleev's work. It was not until the following century, with Gilbert N. Lewis' valence bond theory (1916) and Irving Langmuir's octet theory of chemical bonding (1919), that the importance of the periodicity of eight would be accepted.[9][10] The Royal Chemistry Society acknowledged Newlands' contribution to science in 2008, when they put a Blue Plaque on the house where he was born, which described him as the "discoverer of the Periodic Law for the chemical elements".[1]

text: He contributed the word 'periodic' in chemistry.

text: Dmitri Ivanovich Mendeleev[edit]

text: The Russian chemist Dmitri Mendeleev was the first scientist to make a periodic table similar to the one used today.[citation needed] Mendeleev arranged the elements by atomic mass, corresponding to relative molar mass. It is sometimes said that he played 'chemical solitaire' on long train journeys, using cards with various facts about the known elements.[11] On March 6, 1869, Mendeleev gave a formal presentation, The Dependence Between the Properties of the Atomic Weights of the Elements, to the Russian Chemical Society. In 1869, the table was published in an obscure Russian journal and then republished in a German journal, Zeitschrift für Chemie.[12] In it, Mendeleev stated that:

text:
The elements, if arranged according to their atomic mass, exhibit an apparent periodicity of properties.
Elements which are similar as regards to their chemical properties have atomic weights which are either of nearly the same value (e.g., Pt, Ir, Os) or which increase regularly (e.g., K, Rb, Cs).
The arrangement of the elements, or of groups of elements in the order of their atomic masses, corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F.
The elements which are the most widely diffused have small atomic weights.
The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.
We must expect the discovery of many yet unknown elements – for example, elements analogous to aluminium and silicon – whose atomic weight would be between 65 and 75.
The atomic weight of an element may sometimes be amended by a knowledge of those of its contiguous elements. Thus the atomic weight of tellurium must lie between 123 and 126, and cannot be 128.
Certain characteristic properties of elements can be foretold from their atomic masses.

text: Scientific benefits of Mendeleev's table

text:
It enabled Mendeleev to predict the discovery of new elements and left spaces for them, namely eka-silicon (germanium), eka-aluminium (gallium), and eka-boron (scandium). Thus, there was no disturbance in the periodic table.
It could be used by Mendeleev to point out that some of the atomic weights being used at the time were incorrect.
It provided for variance from atomic weight order.

text: Shortcomings of Mendeleev's table

text:
The table was not able to predict the existence of the noble gases, but did, however, leave spaces for yet to be discovered elements to slot into. Time proved this audacious calculation correct. However, when this entire family of elements was discovered, Sir William Ramsay was able to add them to the table as Group 0, without the basic concept of the periodic table being disturbed.
A single position could not be assigned to hydrogen, which could be placed either in the alkali metals group, the halogens group or separately above the table between boron and carbon.[13]

text: Lothar Meyer[edit]

text: Unknown to Mendeleev, a German chemist, Lothar Meyer, was also working on a periodic table. Although his work was published in 1864, and was done independently of Mendeleev, few historians regard him as an equal co-creator of the periodic table. Meyer's table only included twenty-eight elements, which were not classified by atomic weight, but by valence, and he never reached the idea of predicting new elements and correcting atomic weights. A few months after Mendeleev published his periodic table of the known elements, predicted new elements to help complete his table and corrected the atomic weights of some of the elements, Meyer published a virtually identical periodic table.

text: Meyer and Mendeleev are considered by some historians of science to be the co-creators of the periodic table, but Mendeleev's accurate prediction of the qualities of undiscovered elements enables him to have the larger share of the credit.

text: William Odling[edit]

text: In 1864, the English chemist William Odling also drew up a table that was remarkably similar to the table produced by Mendeleev. Odling overcame the tellurium-iodine problem and even managed to get thallium, lead, mercury and platinum into the right groups, which is something that Mendeleev failed to do at his first attempt. Odling failed to achieve recognition, however, since it is suspected[by whom?] that he, as Secretary of the Chemical Society of London, was instrumental in discrediting Newlands' earlier work on the periodic table.

text: 20th century[edit]

text: Henry Moseley[edit]

text: In 1914, a year before he was killed in action at Gallipoli, the English physicist Henry Moseley found a relationship between the X-ray wavelength of an element and its atomic number. He was then able to re-sequence the periodic table by nuclear charge, rather than by atomic weight. Before this discovery, atomic numbers were sequential numbers based on an element's atomic weight. Moseley's discovery showed that atomic numbers were in fact based upon experimental measurements.

text: Using information about their X-ray wavelengths, Moseley placed argon (with an atomic number Z=18) before potassium (Z=19), despite the fact that argon's atomic weight of 39.9 is greater than the atomic weight of potassium (39.1). The new order was in agreement with the chemical properties of these elements, since argon is a noble gas and potassium is an alkali metal. Similarly, Moseley placed cobalt before nickel and was able to explain that tellurium occurs before iodine, without revising the experimental atomic weight of tellurium, as had been proposed by Mendeleev.

text: Moseley's research showed that there were gaps in the periodic table at atomic numbers 43 and 61, which are now known to be occupied by technetium and promethium respectively.

text: Glenn T. Seaborg[edit]

text: During his Manhattan Project research in 1943, Glenn T. Seaborg experienced unexpected difficulties in isolating the elements americium and curium. Seaborg wondered if these elements belonged to a different series, which would explain why their chemical properties were different from what was expected. In 1945, against the advice of colleagues, he proposed a significant change to Mendeleev's table: the actinide series.

text: Seaborg's actinide concept of heavy element electronic structure, predicting that the actinides form a transition series analogous to the rare earth series of lanthanide elements, is now well accepted and included in the periodic table. The actinide series is the second row of the f-block (5f series). In both the actinide and lanthanide series, an inner electron shell is being filled. The actinide series comprises the elements from actinium to lawrencium. Seaborg's subsequent elaborations of the actinide concept theorized a series of superheavy elements in a transactinide series comprising elements from 104 to 121 and a superactinide series of elements from 122 to 153.


document_title: Estée Lauder (businesswoman)

question_text: when did estee lauder youth dew come out

text: Estée Lauder (businesswoman)

text: Early life and education[edit]

text: Lauder was born Josephine Esther Mentzer in Corona, Queens,[5] New York City,[6] the second child born to Rose (Schotz) Rosenthal and Max Mentzer.[7][8] Her parents were Hungarian-Jewish immigrants,[6][9][10] her mother from Sátoraljaújhely and her father from Gelle (now Holice, Slovakia).[11] Rose emigrated from Hungary to the United States in 1898 with her five children to join her husband, Abraham Rosenthal.[7] But, in 1905, she married Max Mentzer,[7] a shopkeeper who had also immigrated to the United States in the 1890s.[7] When their daughter was born, they wanted to name her Eszti, after her mother's favorite Hungarian aunt, but decided at the last minute to keep the name "Josephine", which they had agreed upon. Immediately though, the baby's nickname became "Estee", and which is the name she grew up responding to. Eventually, when she launched her perfume empire with her husband, she added an accent mark to make her name sound French and began pronouncing it the way her father pronounced it in his Hungarian accent.[12] She attended Newtown High School in Elmhurst, Queens, New York, and much of her childhood was spent trying to make ends meet. Like most of her eight siblings, she worked at the family's hardware store, where she got her first taste of business, of entrepreneurship, and what it takes to be a successful retailer. Her childhood dream was to become an actress with her “name in lights, flowers and handsome men."[8][13]

text: When Estée grew older, she agreed to help her uncle Dr. John Schotz, a chemist, with his business. His company, New Way Laboratories, sold beauty products such as creams, lotions, rouge, and fragrances. She became more interested in his business than her father's. She was fascinated watching her uncle create his products. He also taught her how to wash her face and do facial massages. After graduating from Newtown High School, she focused on her uncle's business.

text: Career[edit]

text: Lauder named one of her uncle's blends Super Rich All-Purpose Cream, and began selling his products to her friends.[7]:115 She sold creams like Six-In-One Cold Cream and Dr. Schotz's Viennese Cream to beauty shops, beach clubs and resorts.[14] One day, as she was getting her hair done at the House of Ash Blondes, the salon's owner Florence Morris asked Lauder about her perfect skin. Soon, Estée returned to the beauty parlor to hand out four of her uncle's creams and demonstrate their use. Morris was so impressed, she asked Lauder to sell her products at her new salon.[7]:116

text: In 1953, Lauder introduced her first fragrance, Youth-Dew, a bath oil that doubled as a perfume. Instead of using French perfumes by the drop behind each ear, women began using Youth-Dew by the bottle in their bath water. In the first year, it sold 50,000 bottles, and by 1984, the figure had jumped to 150 million.[15]

text: Lauder was a subject of a 1985 TV documentary, Estée Lauder: The Sweet Smell of Success. Explaining her success, she said, "I have never worked a day in my life without selling. If I believe in something, I sell it, and I sell it hard."[14]

text: Awards and honors[edit]

text: Lauder received the Knight class of the Legion of Honour from the Consul General of France, Gerard Causer. She was the first woman to receive the Chevalier Commendation,  on 16 January 1978.[16] She was inducted to the Junior Achievement U.S. Business Hall of Fame in 1988. She received  the Presidential Medal of Freedom in 2004.

text: Personal life[edit]

text: Estée met Joseph Lauter when she was in her early 20s. On January 15, 1930, they married. The surname was later changed from Lauter to Lauder. Their first child, Leonard, was born March 19, 1933.[17][18] The couple separated in 1939 and she moved to Florida, but they remarried in 1942.[14] Their second son, Ronald, was born in 1944. Estée and Joseph Lauder remained married until his death in 1982, and she later regretted her divorce, saying that she married young and assumed that she had missed out on life but soon found out that she had the "sweetest husband in the world."[19]

text: Leonard became the chief executive of Estée Lauder[20] and then chairman of the board.[21] Ronald was a Deputy Assistant Secretary of Defense in the Reagan administration and was U.S. Ambassador to Austria in 1986–87.[22]

text: Death[edit]

text: At age 95, Lauder died of cardiopulmonary arrest on April 24, 2004 at her home in Manhattan.[2]


document_title: Small intestine

question_text: where does absorption of amino acids take place

text: Small intestine

text: Structure[edit]

text: Size[edit]

text: The length of the small intestine can vary greatly, from as short as 2.75 m (9.0 ft) to as long as 10.49 m (34.4 ft).[3] The average length in a living person is 3m-5m.[4][5] The length depends both on how tall the person is and how the length is measured.[3] Taller people generally have a longer small intestine and measurements are generally longer after death and when the bowel is empty.[3]

text: It is approximately 1.5 cm in diameter in newborns after 35 weeks of gestational age,[6] and 2.5–3 cm (1 inch) in diameter in adults. On abdominal X-rays, the small intestine is considered to be abnormally dilated when the diameter exceeds 3 cm.[7][8] On CT scans, a diameter of over 2.5 cm is considered abnormally dilated.[7][9] The surface area of the human small intestinal mucosa, due to enlargement caused by folds, villi and microvilli, averages 30 square meters.[10]

text: Parts[edit]

text: The small intestine is divided into three structural parts.

text:
The duodenum is a short structure ranging from 20 cm (7.9 inches) to 25 cm (9.8 inches) in length, and shaped like a "C".[11] It surrounds the head of the pancreas. It receives gastric chyme from the stomach, together with digestive juices from the pancreas (digestive enzymes) and the liver (bile). The digestive enzymes break down proteins and bile and emulsify fats into micelles. The duodenum contains Brunner's glands, which produce a mucus-rich alkaline secretion containing bicarbonate. These secretions, in combination with bicarbonate from the pancreas, neutralize the stomach acids contained in gastric chyme.
The jejunum is the midsection of the small intestine, connecting the duodenum to the ileum. It is about 2.5 m long, and contains the plicae circulares, and villi that increase its surface area. Products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here. The suspensory muscle of duodenum marks the division between the duodenum and the jejunum.
The ileum: The final section of the small intestine. It is about 3 m long, and contains villi similar to the jejunum. It absorbs mainly vitamin B12 and bile acids, as well as any other remaining nutrients. The ileum joins to the cecum of the large intestine at the ileocecal junction.

text: The jejunum and ileum are suspended in the abdominal cavity by mesentery. The mesentery is part of the peritoneum. Arteries, veins, lymph vessels and nerves travel within the mesentery.[12]

text: Blood supply[edit]

text: The small intestine receives a blood supply from the coeliac trunk and the superior mesenteric artery. These are both branches of the aorta. The duodenum receives blood from the coeliac trunk via the superior pancreaticoduodenal artery and from the superior mesenteric artery via the inferior pancreaticoduodenal artery. These two arteries both have anterior and posterior branches that meet in the midline and anastomose. The jejunum and ileum receive blood from the superior mesenteric artery.[13] Branches of the superior mesenteric artery form a series of arches within the mesentery known as arterial arcades, which may be several layers deep. Straight blood vessels known as vasa recta travel from the arcades closest to the ileum and jejunum to the organs themselves.[13]

text: Histology[edit]

text: The three sections of the small intestine look similar to each other at a microscopic level, but there are some important differences. The parts of the intestine are as follows:

text:
Layer
Duodenum
Jejunum
Ileum

Serosa
1st part serosa, 2nd–4th adventitia
Normal
Normal

Muscularis externa
Longitudinal and circular layers, with Auerbach's (myenteric) plexus in between
Same as duodenum
Same as duodenum

Submucosa
Brunner's glands and Meissner's (submucosal) plexus
No BG
No BG

Mucosa: muscularis mucosae
Normal
Normal
Normal

Mucosa: lamina propria
No PP
No PP
Peyer's patches

Mucosa: intestinal epithelium
Simple columnar. Contains goblet cells, Paneth cells
Similar to duodenum
 ?

text: Development[edit]

text: The small intestine develops from the midgut of the primitive gut tube.[14] By the fifth week of embryological life, the ileum begins to grow longer at a very fast rate, forming a U-shaped fold called the primary intestinal loop. The loop grows so fast in length that it outgrows the abdomen and protrudes through the umbilicus. By week 10, the loop retracts back into the abdomen. Between weeks six and ten the small intestine rotates anticlockwise, as viewed from the front of the embryo. It rotates a further 180 degrees after it has moved back into the abdomen. This process creates the twisted shape of the large intestine.[14]

text: Function[edit]

text: Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.

text: Digestion[edit]

text: The small intestine is where most chemical digestion takes place. Many of the digestive enzymes that act in the small intestine are secreted by the pancreas and liver and enter the small intestine via the pancreatic duct. Pancreatic enzymes and bile from the gallbladder enter the small intestine in response to the hormone cholecystokinin, which is produced in the small intestine in response to the presence of nutrients. Secretin, another hormone produced in the small intestine, causes additional effects on the pancreas, where it promotes the release of bicarbonate into the duodenum in order to neutralize the potentially harmful acid coming from the stomach.

text: The three major classes of nutrients that undergo digestion are proteins, lipids (fats) and carbohydrates:

text:
Proteins are degraded into small peptides and amino acids before absorption.[15] Chemical breakdown begins in the stomach and continues in the small intestine. Proteolytic enzymes, including trypsin and chymotrypsin, are secreted by the pancreas and cleave proteins into smaller peptides. Carboxypeptidase, which is a pancreatic brush border enzyme, splits one amino acid at a time. Aminopeptidase and dipeptidase free the end amino acid products.
Lipids (fats) are degraded into fatty acids and glycerol. Pancreatic lipase breaks down triglycerides into free fatty acids and monoglycerides. Pancreatic lipase works with the help of the salts from the bile secreted by the liver and stored in the gall bladder. Bile salts attach to triglycerides to help emulsify them, which aids access by pancreatic lipase. This occurs because the lipase is water-soluble but the fatty triglycerides are hydrophobic and tend to orient towards each other and away from the watery intestinal surroundings. The bile salts emulsify the triglycerides in the watery surroundings until the lipase can break them into the smaller components that are able to enter the villi for absorption.
Some carbohydrates are degraded into simple sugars, or monosaccharides (e.g., glucose). Pancreatic amylase breaks down some carbohydrates (notably starch) into oligosaccharides. Other carbohydrates pass undigested into the large intestine and further handling by intestinal bacteria. Brush border enzymes take over from there. The most important brush border enzymes are dextrinase and glucoamylase, which further break down oligosaccharides. Other brush border enzymes are maltase, sucrase and lactase. Lactase is absent in some adult humans and, for them, lactose, like most poly-saccharides, is not digested in the small intestine. Some carbohydrates, such as cellulose, are not digested at all, despite being made of multiple glucose units. This is because the cellulose is made out of beta-glucose, making the inter-monosaccharidal bindings different from the ones present in starch, which consists of alpha-glucose. Humans lack the enzyme for splitting the beta-glucose-bonds, something reserved for herbivores and bacteria from the large intestine.

text: Absorption[edit]

text: Digested food is now able to pass into the blood vessels in the wall of the intestine through either diffusion or active transport. The small intestine is the site where most of the nutrients from ingested food are absorbed. The inner wall, or mucosa, of the small intestine is lined with simple columnar epithelial tissue. Structurally, the mucosa is covered in wrinkles or folds called plicae circulares, which are considered permanent features in the wall of the organ. They are distinct from rugae which are considered non-permanent or temporary allowing for distention and contraction. From the plicae circulares project microscopic finger-like pieces of tissue called villi (Latin for "shaggy hair"). The individual epithelial cells also have finger-like projections known as microvilli. The functions of the plicae circulares, the villi, and the microvilli are to increase the amount of surface area available for the absorption of nutrients, and to limit the loss of said nutrients to intestinal fauna.

text: Each villus has a network of capillaries and fine lymphatic vessels called lacteals close to its surface. The epithelial cells of the villi transport nutrients from the lumen of the intestine into these capillaries (amino acids and carbohydrates) and lacteals (lipids). The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by our body. The material that remains undigested and unabsorbed passes into the large intestine.

text: Absorption of the majority of nutrients takes place in the jejunum, with the following notable exceptions:

text:
Iron is absorbed in the duodenum.
Vitamin B12 and bile salts are absorbed in the terminal ileum.
Water and lipids are absorbed by passive diffusion throughout the small intestine.
Sodium bicarbonate is absorbed by active transport and glucose and amino acid co-transport.
Fructose is absorbed by facilitated diffusion.

text: Immunological[edit]

text: The small intestine supports the body's immune system.[16] The presence of gut flora appears to contribute positively to the host's immune system. Peyer's patches, located within the ileum of the small intestine, are an important part of the digestive tract's local immune system. They are part of the lymphatic system, and provide a site for antigens from potentially harmful bacteria or other microorganisms in the digestive tract to be sampled, and subsequently presented to the immune system.[17]

text: Gene and protein expression[edit]

text: About 20,000 protein coding genes are expressed in human cells and 70 % of these genes are expressed in the normal duodenum.[18][19] Some 300 of these genes are more specifically expressed in the duodenum with very few genes expressed only in the small intestine. The corresponding specific proteins are expressed in glandular cells of the mucosa, such as fatty acid binding protein FABP6. Most of the more specifically expressed genes in the small intestine are also expressed in the duodenum, for example FABP2 and the DEFA6 protein expressed in secretory granules of Paneth cells.[20]

text: Clinical significance[edit]

text: The small intestine is a complex organ, and as such, there are a very large number of possible conditions that may affect the function of the small bowel. A few of them are listed below, some of which are common, with up to 10% of people being affected at some time in their lives, while others are vanishingly rare.

text:
Small intestine obstruction or obstructive disorders

Paralytic ileus
Volvulus
Hernia
Intussusception
Adhesions
Obstruction from external pressure
Obstruction by masses in the lumen (foreign bodies, bezoar, gallstones)

Infectious diseases

Giardiasis
Ascariasis
Tropical sprue
Tape worm (Diphyllobothrium latum, Taenia solium, Hymenolepsis nana)
Hookworm (e.g. Necator americanus, Ancylostoma duodenale)
Nematodes (e.g. Ascaris lumbricoides)
Other Protozoa (e.g. Cryptosporidium parvum, Cyclospora, Microsporidia, Entamoeba histolytica)
Bacterial infections

Enterotoxigenic Escherichia coli
Salmonella enterica
Campylobacter
Shigella
Yersinia
Clostridium difficile (antibiotic-associated colitis, Pseudomembranous colitis)
Mycobacterium (Mycobacterium avium paratuberculosis, disseminated Mycobacterium tuberculosis)
Whipple's disease
Vibrio (cholera)
Enteric (typhoid) fever (Salmonella enterica var. typhii) and paratyphoid fever
Bacillus cereus
Clostridium perfringens (gas gangrene)

Viral infections

Rotavirus
Norovirus
Astrovirus
Adenovirus
Calicivirus

Neoplasms (cancers)

Adenocarcinoma
Carcinoid
Gastrointestinal stromal tumor (GIST)
Lymphoma
Sarcoma
Leiomyoma
Metastatic tumors, especially SCLC or melanoma

Developmental, congenital or genetic conditions

Duodenal (intestinal) atresia
Hirschsprung's disease
Meckel's diverticulum
Pyloric stenosis
Pancreas divisum
Ectopic pancreas
Enteric duplication cyst
Situs inversus
Cystic fibrosis
Malrotation
Persistent urachus
Omphalocele
Gastroschisis
Disaccharidase (lactase) deficiencies
Primary bile acid malabsorption
Gardner syndrome
Familial adenomatous polyposis syndrome (FAP)

Other conditions

Crohn's disease, and the more general inflammatory bowel disease
Typhlitis (neutropenic colitis in the immunosuppressed
Coeliac disease (sprue or non-tropical sprue)
Mesenteric ischemia
Embolus or thrombus of the superior mesenteric artery or the superior mesenteric vein
Arteriovenous malformation
Gastric dumping syndrome
Irritable bowel syndrome
Duodenal (peptic) ulcers
Gastrointestinal perforation
Hyperthyroidism
Diverticulitis
Radiation enterocolitis
Mesenteric cysts
Peritoneal Infection
Sclerosing retroperitonitis
Small intestinal bacterial overgrowth

text: Other animals[edit]

text: The small intestine is found in all tetrapods and also in teleosts, although its form and length vary enormously between species. In teleosts, it is relatively short, typically around one and a half times the length of the fish's body. It commonly has a number of pyloric caeca, small pouch-like structures along its length that help to increase the overall surface area of the organ for digesting food. There is no ileocaecal valve in teleosts, with the boundary between the small intestine and the rectum being marked only by the end of the digestive epitheliu [21]

text: In tetrapods, the ileocaecal valve is always present, opening into the colon. The length of the small intestine is typically longer in tetrapods than in teleosts, but is especially so in herbivores, as well as in mammals and birds, which have a higher metabolic rate than amphibians or reptiles. The lining of the small intestine includes microscopic folds to increase its surface area in all vertebrates, but only in mammals do these develop into true villi.[21]

text: The boundaries between the duodenum, jejunum, and ileum are somewhat vague even in humans, and such distinctions are either ignored when discussing the anatomy of other animals, or are essentially arbitrary.[21]

text: There is no small intestine as such in non-teleost fish, such as sharks, sturgeons, and lungfish. Instead, the digestive part of the gut forms a spiral intestine, connecting the stomach to the rectum. In this type of gut, the intestine itself is relatively straight, but has a long fold running along the inner surface in a spiral fashion, sometimes for dozens of turns. This valve greatly increases both the surface area and the effective length of the intestine. The lining of the spiral intestine is similar to that of the small intestine in teleosts and non-mammalian tetrapods.[21]

text: In lampreys, the spiral valve is extremely small, possibly because their diet requires little digestion. Hagfish have no spiral valve at all, with digestion occurring for almost the entire length of the intestine, which is not subdivided into different regions.[21]

text: Society and culture[edit]

text: In traditional Chinese medicine, the small intestine is a yang organ.[22]

text: Additional images[edit]

text:
Small intestine in situ, greater omentum folded upwards.

Third state of the development of the intestinal canal and peritoneum, seen from in front (diagrammatic). The mode of preparation is the same as in Fig 400

Second stage of development of the intestinal canal and peritoneum, seen from in front (diagrammatic). The liver has been removed and the two layers of the ventral mesogastrium (lesser omentum) have been cut. The vessels are represented in black and the peritoneum in the reddish tint.

First stage of the development of the intestinal canal and the peritoneum, seen from the side (diagrammatic). From colon 1 the ascending and transverse colon will be formed and from colon 2 the descending and sigmoid colons and the rectum.