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Biltmore Estate
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Biltmore Estate
U.S. National Register of Historic Places
U.S. National Historic Landmark District
Biltmore House
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Location
Buncombe County, North Carolina, North Carolina, United States
Coordinates
35°32′22.74″N 82°33′3.42″W / 35.5396500°N 82.5509500°W / 35.5396500; -82.5509500Coordinates: 35°32′22.74″N 82°33′3.42″W / 35.5396500°N 82.5509500°W / 35.5396500; -82.5509500
Built
1889–95
Architect
Richard Morris Hunt;Frederick Law Olmsted
Architectural style
Châteauesque
Website
http://www.biltmore.com/
NRHP reference #
66000586[1]
Added to NRHP
October 15, 1966;
51 years ago (1966-10-15)
Biltmore Estate is a large (6950.4 acre or 10.86 square miles) private estate and tourist attraction in Asheville, North Carolina. Biltmore House, the main residence, is a Châteauesque-style mansion built by George Washington Vanderbilt II between 1889 and 1895 and is the largest privately owned house in the United States, at 178,926 square feet (16,622.8 m2)[2] of floor space (135,280 square feet (12,568 m2) of living area). Still owned by George Vanderbilt's descendants, it stands today as one of the most prominent remaining examples of the Gilded Age.
Contents
[hide]
1 History
2 Architecture
3 Interiors
3.1 First floor
3.2 Second floor
3.3 Third and fourth floors
3.4 Bachelors' wing
3.5 Basement
4 Park and landscape
5 Estate
6 In other media
7 See also
8 References
9 External links
History[edit]
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]
The Biltmore Estate (c. 1900)
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]
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.
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.
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]
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.
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]
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]
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]
Architecture[edit]
Waddesdon Manor was a principal source for the east elevation
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.
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.
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.
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.[14]
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.[15]
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]
Interiors[edit]
First floor[edit]
The Triumphal Arch
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.[16]
Second floor[edit]
Master bedroom of George Vanderbilt
The second floor is accessed by the cantilevered Grand Staircase of 102 steps spiraling around a four-story, wrought-iron chandelier holding 72 light bulbs.[17] 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.[18] 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.
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.[19]
Third and fourth floors[edit]
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]
Bachelors' wing[edit]
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 lead 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]
Basement[edit]
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.
Park and landscape[edit]
Part of the gardens
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.
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]
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.[20]
Estate[edit]
Storage facility in the Biltmore Winery, 2017
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.[21] 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.[22] 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.[23]
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.
In other media[edit]
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.[24]
The house has been featured in "Empires of the Smoky Skies", a scenario in Sid Meier's Civilization V.
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.[25]
The grounds and buildings of Biltmore Estate have appeared in a number of major motion pictures and TV series:
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)
See also[edit]
List of Gilded Age mansions
List of largest houses in the United States
Richard Sharp Smith
List of National Historic Landmarks in North Carolina
National Register of Historic Places listings in Buncombe County, North Carolina
References[edit]
Jump up ^ National Park Service (2006-03-15). "National Register Information System". National Register of Historic Places. National Park Service.
Jump up ^ Buncombe County Tax Records, http://www.buncombetax.org/, Parcel ID 9637-94-40-00000, Residential Building 22 (mansion) and Commercial Building 9 (attached stable); see also http://www.biltmore.com/visit/house_gardens/house/faq.asp
Jump up ^ Sullivan, Mary Ann. "Biltmore Estate". Retrieved December 12, 2014.
Jump up ^ "When Pearson's Store disappeared". Asheville Citizen-Times. November 6, 2016. p. D6.
Jump up ^ Boyle, John (June 7, 2017). "Answer Man: Cemeteries on Biltmore Estate? Who lived there before Vanderbilts?". Asheville Citizen-Times. Retrieved June 7, 2017.
^ Jump up to: a b "Biltmore House". Retrieved December 12, 2014.
Jump up ^ Chase, Nan K. Asheville: A History, (2007): 69-70.
Jump up ^ Hansley, Richard (2011). Asheville's Historic Architecture, pp. 151-52. The History Press.
Jump up ^ Kiss, Tony (February 16, 2014). "Biltmore Estate hid precious art during World War II". Asheville Citizen-Times.
^ Jump up to: a b c Boyle, John (December 25, 2017). "How will Biltmore Estate handle the transition to new owners?". Asheville Citizen-Times. Retrieved December 25, 2017.
Jump up ^ 2017 Buncombe County property and tax records
Jump up ^ "National Historic Landmark designation illustrates U.S. heritage". biltmore.com.
^ Jump up to: a b c d e Carley, Rachel. Biltmore: An American Masterpiece, (2012).
Jump up ^ Dagmi, Jane. "The Biltmore Estate: A Brief Architectural Tour". Bob Vila. Retrieved December 2, 2014.
Jump up ^ Motsinger, Carol (January 9, 2015). "Downton Abbey is on fire". Asheville Citizen-Times. p. T12.
Jump up ^ "A Tour Through Biltmore Estate". FunTrivia. Retrieved December 2, 2014.
Jump up ^ Henion, Leigh Ann (December 2009). "Biltmore: Behind the Scenes". National Trust for Historic Preservation. Retrieved December 2, 2014.
Jump up ^ Steele, Bruce (September 6, 2013). "Biltmore House renovation restores historic hallway". USA Today. Retrieved December 2, 2014.
Jump up ^ Poupore, Darren (February 8, 2011). "New Suite of Rooms Now Open". Open House Official Blog of Biltmore. Retrieved December 2, 2014.
Jump up ^ Clark McKendree, Sue. "A Technological Tour of the Biltmore Estate". Retrieved December 15, 2014.
Jump up ^ Alexander, Bill (2008). Around Biltmore Village. Charleson: Arcadia Publishing. p. 7. ISBN 978-0-7385-6853-9.
Jump up ^ "Archived copy". Archived from the original on 2008-03-27. Retrieved 2008-03-12. Cathedral of All Souls: History
Jump up ^ Rickman, Ellen Erwin (2005). Biltmore Estate. Charleston: Arcadia Publishing. p. 70. ISBN 978-0-7385-1749-0.
Jump up ^ http://www.biltmore.com/belk
Jump up ^ "SERAFINA AND THE BLACK CLOAK". Kirkus Review. 15 April 2015. Retrieved 25 January 2018.
General
Hewitt, Mark Alan: The Architect & the American Country House. Yale University Press: New Haven & London 1990, p. 1-10
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Syncytium
From Wikipedia, the free encyclopedia
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Not to be confused with Symplast.
A syncytium or symplasm (/sɪnˈsaɪtiəm/; plural syncytia; from Greek: σύν (syn) = "together" + κύτος (kytos) = "box, i.e. cell") is a multinucleated cell that can result from multiple cell fusions of uninuclear cells (i.e., cells with a single nucleus), in contrast to a coenocyte, which can result from multiple nuclear divisions without accompanying cytokinesis.[1] The term may also refer to cells interconnected by specialized membrane with gap junctions, as seen in the heart muscle cells and certain smooth muscle cells, which are synchronized electrically in an action potential.
Another (correct and well-established) use of the word syncytium is found in embryogenesis to refer to the coenocytic blastoderm embryos of invertebrates, such as Drosophila melanogaster.[2]
Contents
[hide]
1 Physiological examples
1.1 Protists
1.2 Plants
1.3 Fungi
1.4 Animals
1.4.1 Skeletal muscle
1.4.2 Cardiac muscle
1.4.3 Osteoclasts
1.4.4 Placenta
1.4.5 Glass sponges
1.4.6 Tegument (helminth)
2 Pathological examples
2.1 Viral infection
2.1.1 Reoviridae
2.1.2 HIV
3 See also
4 References
Physiological examples[edit]
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Axis scale: millions of years.
Orange labels: known ice ages.
Also see: Human timeline and Nature timeline
Protists[edit]
In protists, syncytia can be found in some rhizarians (e.g., chlorarachniophytes, plasmodiophorids, haplosporidians) and acellular slime moulds, dictyostelids (amoebozoans) and acrasids (excavates).
Plants[edit]
Some examples of plant syncytia, which result during plant development, include:
Developing endosperm[3]
The non-articulated laticifers
The plasmodial tapetum,[4] and
The "nucellar plasmodium" of the family Podostemaceae[5]
Fungi[edit]
A syncytium is the normal cell structure for many fungi. Most fungi of Basidiomycota exist as a dikaryon in which thread-like cells of the mycelium are partially partitioned into segments each containing two differing nuclei, called a heterokaryon.
Animals[edit]
Skeletal muscle[edit]
A classic example of a syncytium is the formation of skeletal muscle. Large skeletal muscle fibers form by the fusion of thousands of individual muscle cells. The multinucleated (symplastic) arrangement is important in pathologic states such as myopathy, where focal necrosis (death) of a portion of a skeletal muscle fibers does not result in necrosis of the adjacent sections of that same skeletal muscle fiber, because those adjacent sections have their own nuclear material. Thus, myopathy is usually associated with such "segmental necrosis", but with some of the surviving segments being functionally cut off from their nerve supply via loss of continuity with the neuromuscular junction.
Cardiac muscle[edit]
The syncytium of cardiac muscle is important because it allows rapid coordinated contraction of muscles along their entire length. Action potentials propagate along the surface of the muscle fiber from the point of synaptic contact, through intercalated discs. Although a syncytium, cardiac muscle differs because the cells are not long and multinucleated. Cardiac tissue is therefore described as a functional syncytium, as opposed to the true syncytium of skeletal muscle.
Osteoclasts[edit]
Certain animal immune-derived cells may form aggregate cells also, for example the osteoclast cells responsible for bone resorption.
Placenta[edit]
Another important vertebrate syncytium is in the placenta of placental mammals. Embryo-derived cells that form the interface with the maternal blood stream fuse together to form a multinucleated barrier - the syncytiotrophoblast. This is probably important to limit the exchange of migratory cells between the developing embryo and the body of the mother, as some blood cells are specialized to be able to insert themselves between adjacent epithelial cells. The syncytial epithelium of the placenta does not provide such an access path from the maternal circulation into the embryo.
Glass sponges[edit]
Much of the body of Hexactinellid sponges is composed of syncitial tissue. This allows them to form their large siliceous spicules exclusively inside their cells.[6]
Tegument (helminth)[edit]
The fine structure of tegument is essentially the same in both the cestodes and trematodes. A typical tegument is 7-16 μm thick, with distinct layers. It is a syncytium consisting of multinucleated tissues with no distinct cell boundaries. The outer zone of the syncytium, called the "distal cytoplasm," is lined with a plasma membrane. This plasma membrane is in turn associated with a layer of carbohydrate-containing macromolecules known as the glycocalyx, that varies in thickness from one species to another. The distal cytoplasm is connected to the inner layer called the "proximal cytoplasm", which is the "cellular region or cyton or perikarya" through cytoplasmic tubes that are composed of microtubules. The proximal cytoplasm contains nuclei, endoplasmic reticulum, Golgi complex, mitochondria, ribosomes, glycogen deposits, and numerous vesicles.[7] The internal most layer is bounded by a layer of connective tissue known as the "basal lamina". The basal lamina is followed by a thick layer of muscle.[8]
Pathological examples[edit]
Viral infection[edit]
Syncytium caused by HSV-1 infection in Vero cells
Syncytia can also form when cells are infected with certain types of viruses, notably HSV-1, HIV, MeV, and pneumoviruses, e.g. respiratory syncytial virus (RSV). These syncytial formations create distinctive cytopathic effects when seen in permissive cells. Because many cells fuse together, syncytium are also known as multinucleated giant cells or polykaryocytes.[9] During infection, viral fusion proteins used by the virus to enter the cell are transported to the cell surface, where they can cause the host cell membrane to fuse with neighboring cells.
Reoviridae[edit]
Typically, the viral families that can cause syncytium are enveloped because viral envelope proteins on the surface of the host cell are needed to fuse with other cells.[10] But, certain members of the Reoviridae family are notable exceptions due to a unique set of proteins known as fusion-associated small transmembrane (FAST) proteins.[11] Reovirus induced syncytium formation is not found in humans, but is found in a number of other species and is caused by fusogenic orthoreoviruses. These fusogenic orthoreoviruses include reptilian orthoreovirus, avian orthoreovirus, Nelson Bay orthoreovirus, and baboon orthoreovirus.[12]
HIV[edit]
HIV infects CD4+ T cells and makes the cell produce viral proteins, including fusion proteins. Then, the cell begins to display surface HIV glycoproteins, which are antigenic. Normally, a cytotoxic T cell will immediately come to "inject" lymphotoxins, such as perforin or granzyme, that will kill the infected T helper cell. However, if T helper cells are nearby, the gp41 HIV receptors displayed on the surface of the T helper cell will bind to other similar lymphocytes.[13] This makes dozens of T helper cells fuse cell membranes into a giant, nonfunctional syncytium, which allows the HIV virion to kill many T helper cells by infecting only one.
See also[edit]
Atrial syncytium
Coenocyte
Giant cell
Heterokaryon
Heterokaryosis
Plasmodium (life cycle)
Enteridium lycoperdon, a plasmodial slime mould
Syncytiotrophoblast
Xenophyophorea
References[edit]
Jump up ^ Daubenmire, R. F. (1936). "The Use of the Terms Coenocyte and Syncytium in Biology". Science. 84 (2189): 533–534. PMID 17806555. doi:10.1126/science.84.2189.533.
Jump up ^ Willmer, P. G. (1990). Invertebrate Relationships : Patterns in Animal Evolution. Cambridge University Press, Cambridge.
Jump up ^ Płachno, B. J.; Swiątek, P. (2010). "Syncytia in plants: Cell fusion in endosperm—placental syncytium formation in Utricularia (Lentibulariaceae)". Protoplasma. 248 (2): 425–435. PMID 20567861. doi:10.1007/s00709-010-0173-1.
Jump up ^ Tiwari, S. C.; Gunning, B. E. S. (1986). "Colchicine inhibits plasmodium formation and disrupts pathways of sporopollenin secretion in the anther tapetum ofTradescantia virginiana L". Protoplasma. 133 (2–3): 115. doi:10.1007/BF01304627.
Jump up ^ Murguía-Sánchez, G. (2002). "Embryo sac development in Vanroyenella plumosa, Podostemaceae". Aquatic Botany. 73 (3): 201–201. doi:10.1016/S0304-3770(02)00025-6.
Jump up ^ http://palaeos.com/metazoa/porifera/hexactinellida.html
Jump up ^ Gobert, Geoffrey N.; Stenzel, Deborah J.; McManus, Donald P.; Jones, Malcolm K. (December 2003). "The ultrastructural architecture of the adult Schistosoma japonicum tegument". International Journal for Parasitology. 33 (14): 1561–1575. ISSN 0020-7519. PMID 14636672.
Jump up ^ Jerome), Bogitsh, Burton J. (Burton (2005). Human parasitology. Carter, Clint E. (Clint Earl), Oeltmann, Thomas N. Burlington, MA: Elsevier Academic Press. ISBN 0120884682. OCLC 769187741.
Jump up ^ Albrecht, Thomas; Fons, Michael; Boldogh, Istvan; Rabson, Alan S. (1996-01-01). Baron, Samuel, ed. Medical Microbiology (4th ed.). Galveston (TX): University of Texas Medical Branch at Galveston. ISBN 0963117211. PMID 21413282.
Jump up ^ "ViralZone: Syncytium formation induced by viral infection". viralzone.expasy.org. Retrieved 2016-12-16.
Jump up ^ Salsman, Jayme; Top, Deniz; Boutilier, Julie; Duncan, Roy (2005-07-01). "Extensive Syncytium Formation Mediated by the Reovirus FAST Proteins Triggers Apoptosis-Induced Membrane Instability". Journal of Virology. 79 (13): 8090–8100. ISSN 0022-538X. PMC 1143762  . PMID 15956554. doi:10.1128/JVI.79.13.8090-8100.2005.
Jump up ^ Duncan, Roy; Corcoran, Jennifer; Shou, Jingyun; Stoltz, Don (2004-02-05). "Reptilian reovirus: a new fusogenic orthoreovirus species". Virology. 319 (1): 131–140. doi:10.1016/j.virol.2003.10.025.
Jump up ^ Huerta, L.; López-Balderas, N.; Rivera-Toledo, E.; Sandoval, G.; Gȑmez-Icazbalceta, G.; Villarreal, C.; Lamoyi, E.; Larralde, C. (2009). "HIV-Envelope–Dependent Cell-Cell Fusion: Quantitative Studies". The Scientific World Journal. 9: 746–763. PMID 19705036. doi:10.1100/tsw.2009.90.
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Electron shell
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Periodic table with electron shells
In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with the principal quantum numbers (n = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).
Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.[1] Since electrons are electrically attracted to the nucleus, an atom's electrons will generally occupy outer shells only if the more inner shells have already been completely filled by other electrons. However, this is not a strict requirement: atoms may have two or even three incomplete outer shells. (See Madelung rule for more details.) For an explanation of why electrons exist in these shells see electron configuration.[2]
The electrons in the outermost occupied shell (or shells) determine the chemical properties of the atom; it is called the valence shell.
Each shell consists of one or more subshells, and each subshell consists of one or more atomic orbitals.
Contents
[hide]
1 History
2 Shells
3 Subshells
4 Number of electrons in each shell
5 Valence shell
6 List of elements with electrons per shell
7 See also
8 References
History
The shell terminology comes from Arnold Sommerfeld's modification of the Bohr model. Sommerfeld retained Bohr's planetary model, but added mildly elliptical orbits (characterized by additional quantum numbers ℓ and m) to explain the fine spectroscopic structure of some elements.[3] The multiple electrons with the same principal quantum number (n) had close orbits that formed a "shell" of positive thickness instead of the infinitely thin circular orbit of Bohr's model.
The existence of electron shells was first observed experimentally in Charles Barkla's and Henry Moseley's X-ray absorption studies. Barkla labeled them with the letters K, L, M, N, O, P, and Q.[4] The origin of this terminology was alphabetic. A "J" series was also suspected, though later experiments indicated that the K absorption lines are produced by the innermost electrons. These letters were later found to correspond to the n values 1, 2, 3, etc. They are used in the spectroscopic Siegbahn notation.
The physical chemist Gilbert Lewis was responsible for much of the early development of the theory of the participation of valence shell electrons in chemical bonding. Linus Pauling later generalized and extended the theory while applying insights from quantum mechanics.
Shells
The electron shells are labeled K, L, M, N, O, P, and Q; or 1, 2, 3, 4, 5, 6, and 7; going from innermost shell outwards. Electrons in outer shells have higher average energy and travel farther from the nucleus than those in inner shells. This makes them more important in determining how the atom reacts chemically and behaves as a conductor, because the pull of the atom's nucleus upon them is weaker and more easily broken. In this way, a given element's reactivity is highly dependent upon its electronic configuration.
Subshells
Each shell is composed of one or more subshells, which are themselves composed of atomic orbitals. For example, the first (K) shell has one subshell, called 1s; the second (L) shell has two subshells, called 2s and 2p; the third shell has 3s, 3p, and 3d; the fourth shell has 4s, 4p, 4d and 4f; the fifth shell has 5s, 5p, 5d, and 5f and can theoretically hold more but the 5f subshell, although partially occupied in actinides, is not filled in any element occurring naturally.[2] The various possible subshells are shown in the following table:
Subshell label
ℓ
Max electrons
Shells containing it
Historical name
s 0 2 Every shell sharp
p 1 6 2nd shell and higher principal
d 2 10 3rd shell and higher diffuse
f 3 14 4th shell and higher fundamental
g 4 18 5th shell and higher (theoretically) (next in alphabet after f, excluding j)[5]
The first column is the "subshell label", a lowercase-letter label for the type of subshell. For example, the "4s subshell" is a subshell of the fourth (N) shell, with the type (s) described in the first row.
The second column is the azimuthal quantum number (ℓ) of the subshell. The precise definition involves quantum mechanics, but it is a number that characterizes the subshell.
The third column is the maximum number of electrons that can be put into a subshell of that type. For example, the top row says that each s-type subshell (1s, 2s, etc.) can have at most two electrons in it. In each case the figure is 4 greater than the one above it.
The fourth column says which shells have a subshell of that type. For example, looking at the top two rows, every shell has an s subshell, while only the second shell and higher have a p subshell (i.e., there is no "1p" subshell).
The final column gives the historical origin of the labels s, p, d, and f. They come from early studies of atomic spectral lines. The other labels, namely g, h and i, are an alphabetic continuation following the last historically originated label of f.
Although it is commonly stated that all the electrons in a shell have the same energy, this is an approximation. However, the electrons in one subshell do have exactly the same level of energy,[6] with later subshells having more energy per electron than earlier ones. This effect is great enough that the energy ranges associated with shells can overlap (see valence shells and Aufbau principle).
Number of electrons in each shell
Shells and subshells. 1 rectangular triangle (1/2 of a cell) = 1 electron on the level. Red color indicates sublevel s; orange - p; yellow - d; green - f; blue - g; indigo - h; violet - i
Shell
name
Subshell
name
Subshell
max
electrons
Shell
max
electrons
K 1s 2 2
L 2s 2 2 + 6 = 8
2p 6
M 3s 2 2 + 6 + 10
= 18
3p 6
3d 10
N 4s 2 2 + 6 +
10 + 14
= 32
4p 6
4d 10
4f 14
O 5s 2 2 + 6 +
10 + 14 +
18 = 50
5p 6
5d 10
5f 14
5g 18
Each subshell is constrained to hold 4ℓ + 2 electrons at most, namely:
Each s subshell holds at most 2 electrons
Each p subshell holds at most 6 electrons
Each d subshell holds at most 10 electrons
Each f subshell holds at most 14 electrons
Each g subshell holds at most 18 electrons
Therefore, the K shell, which contains only an s subshell, can hold up to 2 electrons; the L shell, which contains an s and a p, can hold up to 2 + 6 = 8 electrons, and so forth; in general, the nth shell can hold up to 2n2 electrons.[1]
Although that formula gives the maximum in principle, in fact that maximum is only achieved (by known elements) for the first four shells (K, L, M, N). No known element has more than 32 electrons in any one shell.[7][8] This is because the subshells are filled according to the Aufbau principle. The first elements to have more than 32 electrons in one shell would belong to the g-block of period 8 of the periodic table. These elements would have some electrons in their 5g subshell and thus have more than 32 electrons in the O shell (fifth principal shell).
Valence shell
See also: Valence electron
The valence shell is the outermost shell of an atom. Valence electrons in non-transition metal elements reside in this shell. Such elements with complete valence shells (noble gases) are the most chemically non-reactive, while those with only one electron in their valence shells (alkali metals) or just missing one electron from having a complete shell (halogens) are the most reactive.[9]
However, this terminology is somewhat misleading in the case of transition metals. In these elements, a valence electron can also be in an inner shell. Thus, the electrons that determine how an atom reacts chemically are those that travel farthest from the nucleus, that is, those with the highest energy, and not necessarily in the valence shell.
List of elements with electrons per shell
The list below gives the elements arranged by increasing atomic number and shows the number of electrons per shell. At a glance, one can see that subsets of the list show obvious patterns. In particular, the seven elements (in electric blue) before a noble gas (group 18, in yellow) higher than helium have the number of electrons in the valence shell in arithmetic progression. (However, this pattern may break down in the seventh period due to relativistic effects.)
Sorting the table by chemical group shows additional patterns, especially with respect to the last two outermost shells. (Elements 57 to 71 belong to the lanthanides, while 89 to 103 are the actinides.)
The list below is primarily consistent with the Aufbau principle. However, there are a number of exceptions to the rule; for example palladium (atomic number 46) has no electrons in the fifth shell, unlike other atoms with lower atomic number. Some entries in the table are uncertain, when experimental data is unavailable. (For example, the elements past 108 have such short half-lives that their electron configurations have not yet been measured.)
Z
Element
No. of electrons/shell
Group
1 Hydrogen 1 1
2 Helium 2 18
3 Lithium 2, 1 1
4 Beryllium 2, 2 2
5 Boron 2, 3 13
6 Carbon 2, 4 14
7 Nitrogen 2, 5 15
8 Oxygen 2, 6 16
9 Fluorine 2, 7 17
10 Neon 2, 8 18
11 Sodium 2, 8, 1 1
12 Magnesium 2, 8, 2 2
13 Aluminium 2, 8, 3 13
14 Silicon 2, 8, 4 14
15 Phosphorus 2, 8, 5 15
16 Sulfur 2, 8, 6 16
17 Chlorine 2, 8, 7 17
18 Argon 2, 8, 8 18
19 Potassium 2, 8, 8, 1 1
20 Calcium 2, 8, 8, 2 2
21 Scandium 2, 8, 9, 2 3
22 Titanium 2, 8, 10, 2 4
23 Vanadium 2, 8, 11, 2 5
24 Chromium 2, 8, 13, 1 6
25 Manganese 2, 8, 13, 2 7
26 Iron 2, 8, 14, 2 8
27 Cobalt 2, 8, 15, 2 9
28 Nickel 2, 8, 16, 2 10
29 Copper 2, 8, 18, 1 11
30 Zinc 2, 8, 18, 2 12
31 Gallium 2, 8, 18, 3 13
32 Germanium 2, 8, 18, 4 14
33 Arsenic 2, 8, 18, 5 15
34 Selenium 2, 8, 18, 6 16
35 Bromine 2, 8, 18, 7 17
36 Krypton 2, 8, 18, 8 18
37 Rubidium 2, 8, 18, 8, 1 1
38 Strontium 2, 8, 18, 8, 2 2
39 Yttrium 2, 8, 18, 9, 2 3
40 Zirconium 2, 8, 18, 10, 2 4
41 Niobium 2, 8, 18, 12, 1 5
42 Molybdenum 2, 8, 18, 13, 1 6
43 Technetium 2, 8, 18, 13, 2 7
44 Ruthenium 2, 8, 18, 15, 1 8
45 Rhodium 2, 8, 18, 16, 1 9
46 Palladium 2, 8, 18, 18 10
47 Silver 2, 8, 18, 18, 1 11
48 Cadmium 2, 8, 18, 18, 2 12
49 Indium 2, 8, 18, 18, 3 13
50 Tin 2, 8, 18, 18, 4 14
51 Antimony 2, 8, 18, 18, 5 15
52 Tellurium 2, 8, 18, 18, 6 16
53 Iodine 2, 8, 18, 18, 7 17
54 Xenon 2, 8, 18, 18, 8 18
55 Caesium 2, 8, 18, 18, 8, 1 1
56 Barium 2, 8, 18, 18, 8, 2 2
57 Lanthanum 2, 8, 18, 18, 9, 2 3
58 Cerium 2, 8, 18, 19, 9, 2
59 Praseodymium 2, 8, 18, 21, 8, 2
60 Neodymium 2, 8, 18, 22, 8, 2
61 Promethium 2, 8, 18, 23, 8, 2
62 Samarium 2, 8, 18, 24, 8, 2
63 Europium 2, 8, 18, 25, 8, 2
64 Gadolinium 2, 8, 18, 25, 9, 2
65 Terbium 2, 8, 18, 27, 8, 2
66 Dysprosium 2, 8, 18, 28, 8, 2
67 Holmium 2, 8, 18, 29, 8, 2
68 Erbium 2, 8, 18, 30, 8, 2
69 Thulium 2, 8, 18, 31, 8, 2
70 Ytterbium 2, 8, 18, 32, 8, 2
71 Lutetium 2, 8, 18, 32, 9, 2
72 Hafnium 2, 8, 18, 32, 10, 2 4
73 Tantalum 2, 8, 18, 32, 11, 2 5
74 Tungsten 2, 8, 18, 32, 12, 2 6
75 Rhenium 2, 8, 18, 32, 13, 2 7
76 Osmium 2, 8, 18, 32, 14, 2 8
77 Iridium 2, 8, 18, 32, 15, 2 9
78 Platinum 2, 8, 18, 32, 17, 1 10
79 Gold 2, 8, 18, 32, 18, 1 11
80 Mercury 2, 8, 18, 32, 18, 2 12
81 Thallium 2, 8, 18, 32, 18, 3 13
82 Lead 2, 8, 18, 32, 18, 4 14
83 Bismuth 2, 8, 18, 32, 18, 5 15
84 Polonium 2, 8, 18, 32, 18, 6 16
85 Astatine 2, 8, 18, 32, 18, 7 17
86 Radon 2, 8, 18, 32, 18, 8 18
87 Francium 2, 8, 18, 32, 18, 8, 1 1
88 Radium 2, 8, 18, 32, 18, 8, 2 2
89 Actinium 2, 8, 18, 32, 18, 9, 2 3
90 Thorium 2, 8, 18, 32, 18, 10, 2
91 Protactinium 2, 8, 18, 32, 20, 9, 2
92 Uranium 2, 8, 18, 32, 21, 9, 2
93 Neptunium 2, 8, 18, 32, 22, 9, 2
94 Plutonium 2, 8, 18, 32, 24, 8, 2
95 Americium 2, 8, 18, 32, 25, 8, 2
96 Curium 2, 8, 18, 32, 25, 9, 2
97 Berkelium 2, 8, 18, 32, 27, 8, 2
98 Californium 2, 8, 18, 32, 28, 8, 2
99 Einsteinium 2, 8, 18, 32, 29, 8, 2
100 Fermium 2, 8, 18, 32, 30, 8, 2
101 Mendelevium 2, 8, 18, 32, 31, 8, 2
102 Nobelium 2, 8, 18, 32, 32, 8, 2
103 Lawrencium 2, 8, 18, 32, 32, 8, 3
104 Rutherfordium 2, 8, 18, 32, 32, 10, 2 4
105 Dubnium 2, 8, 18, 32, 32, 11, 2 5
106 Seaborgium 2, 8, 18, 32, 32, 12, 2 6
107 Bohrium 2, 8, 18, 32, 32, 13, 2 7
108 Hassium 2, 8, 18, 32, 32, 14, 2 8
109 Meitnerium 2, 8, 18, 32, 32, 15, 2 (?) 9
110 Darmstadtium 2, 8, 18, 32, 32, 16, 2 (?) 10
111 Roentgenium 2, 8, 18, 32, 32, 17, 2 (?) 11
112 Copernicium 2, 8, 18, 32, 32, 18, 2 (?) 12
113 Nihonium 2, 8, 18, 32, 32, 18, 3 (?) 13
114 Flerovium 2, 8, 18, 32, 32, 18, 4 (?) 14
115 Moscovium 2, 8, 18, 32, 32, 18, 5 (?) 15
116 Livermorium 2, 8, 18, 32, 32, 18, 6 (?) 16
117 Tennessine 2, 8, 18, 32, 32, 18, 7 (?) 17
118 Oganesson 2, 8, 18, 32, 32, 18, 8 (?) 18
See also
Wikimedia Commons has media related to Electron shell diagrams.
Periodic table (electron configurations)
Electron counting
18-Electron rule
Core charge
References
^ Jump up to: a b Re: Why do electron shells have set limits ? madsci.org, 17 March 1999, Dan Berger, Faculty Chemistry/Science, Bluffton College
^ Jump up to: a b Electron Subshells. Corrosion Source.
Jump up ^ Donald Sadoway, Introduction to Solid State Chemistry, Lecture 5
Jump up ^ Barkla, Charles G. (1911). "XXXIX.The spectra of the fluorescent Röntgen radiations". Philosophical Magazine. Series 6. 22 (129): 396. doi:10.1080/14786440908637137. Previously denoted by letters B and A (...). The letters K and L are, however, preferable, as it is highly probable that series of radiations both more absorbable and more penetrating exist.
Jump up ^ Jue, T. (2009). "Quantum Mechanic Basic to Biophysical Methods". Fundamental Concepts in Biophysics. Berlin: Springer. p. 33. ISBN 1-58829-973-2.
Jump up ^ The statement that the electrons in one subshell have exactly the same level of energy is true in an isolated atom, where it follows quantum-mechanically from the spherical symmetry of the system. When the atom is part of a molecule, this no longer holds; see, for example, crystal field theory.
Jump up ^ Orbitals. Chem4Kids. Retrieved on 1 December 2011.
Jump up ^ Electron & Shell Configuration. Chemistry.patent-invent.com. Retrieved on 1 December 2011.
Jump up ^ Chemical Reactions. Vision Learning (26 July 2011). Retrieved on 1 December 2011.
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