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Accordion
The accordion is a box-shaped musical instrument of the bellows-driven free-reed aerophone family, sometimes referred to as a squeezebox. A person who plays the accordion is called an accordionist.

Accra Academy High School
The Accra Academy is the first private Academy to be established in the then Gold Coast now Ghana. The Academy is one of the foremost secondary educational institutions in Ghana today and currently operates as a non-denominational Day and Boarding Boys School, located at Bubuashie in the Greater Accra Region

Accuphase
Accuphase Laboratories, Inc. is a Japanese high-end audio equipment manufacturer founded by former Kenwood engineer Jiro Kasuga in late 1972. Kasuga was not happy with the views of Kenwood relating to the follower of their High-End Supreme 1 unit

Accuracy International Arctic Warfare
The Accuracy International Arctic Warfare rifle is a family of bolt-action sniper rifles designed and manufactured by the British company Accuracy International

Ace Combat 5: The Unsung War
, released in the PAL region as Ace Combat: Squadron Leader, is a semi-realistic flight combat video game for the PlayStation 2. Like other titles in Namco's Ace Combat series, Ace Combat 5 features gameplay that is a mix between arcade flight and authentic flight simulation

Ace in the Hole (Cole Porter song)
"Ace in the Hole" is a popular song composed by Cole Porter. The song was written expressly for Porter's musical Let's Face It! which debuted at New York City's Imperial Theatre on 29 October 1941. In the original production, "Ace in the Hole" was performed by Mary Jane Walsh and Nanette Fabray

Acer palmatum
Acer palmatum, called Japanese Maple or Smooth Japanese Maple is a species of woody plant native to Japan, North Korea, South Korea, China, eastern Mongolia, and southeast Russia. Many different cultivars of this maple have been selected and they are grown worldwide for their attractive leaf shapes and colors

Acetaldehyde
Acetaldehyde is an organic chemical compound with the formula CH3CHO or MeCHO. It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale industrially. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants as part of their normal metabolism

Acetaldehyde dehydrogenase
Acetaldehyde dehydrogenases are dehydrogenase enzymes which catalyze the conversion of acetaldehyde into acetic acid. The oxidation of acetaldehyde to acetate can be summarized as follows:

Acetamide
Acetamide is an organic compound with the formula CH3CONH2. It is the simplest amide derived from acetic acid. It finds some use as a plasticizer and as an industrial solvent

Acetic acid
Acetic acid is an organic compound with the chemical formula CH3CO2H . It is a colourless liquid that when undiluted is also called glacial acetic acid. Acetic acid is the main component of vinegar , and has a distinctive sour taste and pungent smell

Acetic anhydride
Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula 2O. Commonly abbreviated Ac2O, it is the simplest isolatable acid anhydride and is a widely used reagent in organic synthesis

Acetone
Acetone is the organic compound with the formula 2CO, a colorless, mobile, flammable liquid, the simplest example of the ketones.Acetone is miscible with water and serves as an important solvent in its own right, typically as the solvent of choice for cleaning purposes in the laboratory

Acetonitrile
Acetonitrile is the chemical compound with formula . This colourless liquid is the simplest organic nitrile. It is produced mainly as a byproduct of acrylonitrile manufacture

Acetyl chloride
Acetyl chloride, CH3COCl, also known as ethanoyl chloride or acyl chloride, is an acid chloride derived from acetic acid. It belongs to the class of organic compounds called acyl halides. It is a colorless liquid. Acetyl chloride does not exist in nature, because contact with water would hydrolyze it into acetic acid and hydrogen chloride

Acetylacetone
Acetylacetone is an organic compound that famously exists in two tautomeric forms that rapidly interconvert. The less stable tautomer is a diketone formally named pentane-2,4-dione. The more common tautomer is the enol form. The pair of tautomers rapidly interconvert and are treated as a single compound in most applications

Acetylated distarch adipate
Acetylated distarch adipate , is a starch that is treated with acetic anhydride and adipic acid anhydride to resist high temperatures. It is used in foods as a bulking agent, stabilizer and a thickener.

Acetylcholine
The chemical compound acetylcholine is a neurotransmitter in both the peripheral nervous system and central nervous system in many organisms including humans

Acetyldihydrocodeine
Acetyldihydrocodeine is an opiate derivative discovered in Germany in 1914 and was used as as a cough suppressant and analgesic. It is not commonly used, but has activity similar to other opiates

Acetylene
Acetylene is the chemical compound with the formula C2H2. It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in pure form and thus is usually handled as a solution.As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond

Achacachi Municipality
Achacachi Municipality is one of five municipalities of the Omasuyos Province in the La Paz Department in Bolivia. Its seat is Achacachi.The municipality is situated in the northern Altiplano of the Bolivian Andes region on the eastern shore of Lake Titicaca bordered to the north by the Larecaja Province, to the east by the Los Andes Province, to the south-west by the Huarina

Achaemenid Empire
The Achaemenid Empire , sometimes known as First Persian Empire and/or Persian Empire, was founded in the 6th century BCE by Cyrus the Great who overthrew the Median confederation

Achaemenid Empire
The Achaemenid Empire , sometimes known as First Persian Empire and/or Persian Empire, was founded in the 6th century BCE by Cyrus the Great who overthrew the Median confederation

Achakzai
Achakzai are Durrani primarily found in southern Afghanistan and northern regions of Balochistan Province, Pakistan.-Demographics:Achakzais of Afghanistan are mainly located in Spin Boldak, Reg, Kandahar, Helmand, Oruzgan and Herat

Acharya Shree Rakeshprasadji Maharaj
Sanatan Dharma Dhurandar Acharya Maharaj Shree 1008 Rakeshprasadji Maharaj is the current Acharya of the LaxmiNarayan Dev Gadi of Swaminarayan Sampraday and the 9th Spiritual Successor of Bhagwan Swaminarayan in the South Diocese of the Swaminarayan

Achievement Medal
The Achievement Medal is a military decoration of the United States military. The Achievement Medal was first proposed as a means to recognize the contributions of junior officers and enlisted personnel who were not eligible to receive the higher Commendation Medal or the Meritorious Service Medal.Each military service issues its own version of the Achievement Medal, with a fifth version

Achill Island
Achill Island in County Mayo is the largest island off the coast of Ireland, and is situated off the west coast. It has a population of 2,700. Its area is . Achill is attached to the mainland by Michael Davitt Bridge, between the villages of Gob an Choire and Poll Raithní . A bridge was first completed here in 1887, and replaced by the current structure in 1949

Achille Starace
Achille Starace was a prominent leader of Fascist Italy prior to and during World War II.-Early life and career:Starace was born in Gallipoli in southern Italy near Lecce. He was son of a wine and oil merchant.

Achilles
In Greek mythology, Achilles was a Greek hero of the Trojan War, the central character and the greatest warrior of Homer's Iliad.Plato named Achilles the handsomest of the heroes assembled against Troy.

Achilles tendon
The Achilles tendon , also known as the calcaneal tendon or the tendo calcaneus, is a tendon of the posterior leg. It serves to attach the plantaris, gastrocnemius and soleus muscles to the calcaneus bone.- Anatomy :The Achilles is the tendonous extension of 3 muscles in the lower leg: gastrocnemius and soleus

Achiote
Achiote is a shrub or small tree from the tropical region of the Americas. The name derives from the Nahuatl word for the shrub, achiotl. It is also known as Aploppas, and its original Tupi name urucu. It is cultivated there and in Southeast Asia, where it was introduced by the Spanish in the 17th century

Achondroplasia
Achondroplasia dwarfism occurs as a sporadic mutation in approximately 85% of cases or may be inherited in an autosomal dominant genetic disorder that is a common cause of dwarfism

Achyuta Deva Raya
Tuluva Achyuta Raya was a ruler of a Vijayanagara Empire of South India. He was the younger brother of Krishna Deva Raya, whom he succeeded in 1529. He patronised Kannada poet Chatu Vittalanatha and the great singer Purandaradasa and the Sanskrit scholar Rajanatha Dindima II. Upon his death, the succession was disputed

Acid
An acid is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger, and turn blue litmus paper red

Acid rain
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions . It can have harmful effects on plants, aquatic animals, and infrastructure. Acid rain is caused by emissions of carbon dioxide, sulfur dioxide and nitrogen oxides which react with the water molecules in the atmosphere to produce acids

Acid throwing
Acid throwing is a form of violent assault.. It is defined as the act of throwing acid onto the body of a person "with the intention of injuring or disfiguring him out of jealousy or revenge"

Acid-fast
Acid-fastness is a physical property of certain bacteria, specifically their resistance to decolorization by acids during staining procedures.Acid-fast organisms are difficult to characterize using standard microbiological techniques Acid-fastness is a physical property of certain bacteria, specifically their resistance to decolorization by acids during staining procedures.Acid-fast organisms are difficult to characterize using standard microbiological techniques Acid-fastness is a physical property of certain bacteria, specifically their resistance to decolorization by acids during staining procedures.Acid-fast organisms are difficult to characterize using standard microbiological techniques (e.g

Acidity function
An acidity function is a measure of the acidity of a medium or solvent system, usually expressed in terms of its ability to donate protons to a solute . The pH scale is by far the most commonly used acidity function, and is ideal for dilute aqueous solutions

Acidophile (histology)
An acidophile describes is a term used by histologists to describe a particular staining pattern of cells and tissues when using haematoxylin and eosin stains

Acinetobacter
Acinetobacter [asz−in−ée−toe–back−ter] is a genus of Gram-negative bacteria belonging to the Gammaproteobacteria. Acinetobacter species are non-motile and oxidase-negative, and occur in pairs under magnification.

Acinetobacter baumannii
Acinetobacter baumannii is a species of pathogenic bacteria, referred to as an aerobic gram-negative bacterium, that is resistant to most antibiotics. As a result of its resistance to drug treatment, some estimates state the disease is killing tens of thousands of U.S

Ackee
The ackee, also known as the vegetable brain, achee, akee apple or akee is a member of the Sapindaceae , native to tropical West Africa in Cameroon, Gabon, São Tomé and Príncipe, Benin, Burkina Faso, Côte d'Ivoire, Ghana, Guinea, Guinea-Bissau, Mali, Nigeria, Senegal, Sierra Leone and Togo.It is related to the lychee

Ackermann steering geometry
Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radius

Acme Brick
Acme Brick Company is an American manufacturer and distributor of brick and masonry-related construction products and materials. Founder, George E. Bennett , chartered the company in Alton, Illinois as the 'Acme Pressed Brick Company' on April 17, 1891

Acne vulgaris
Acne vulgaris is a common human skin disease, characterized by areas of skin with seborrhea , comedones , papules , pustules , Nodules and possibly scarring

Acoma Pueblo
Acoma Pueblo is a Native American pueblo approximately 60 miles west of Albuquerque, New Mexico in the United States. Three reservations make up Acoma Pueblo: Sky City , Acomita, and McCartys. The Acoma Pueblo tribe is a federally recognized tribal entity

Aconcagua
Aconcagua is the highest mountain in the Americas at . It is located in the Andes mountain range, in the Argentine province of Mendoza and it lies west by north of its capital, the city of Mendoza. The summit is also located about 5 kilometres from San Juan Province and 15 kilometres from the international border with Chile

Aconitase
Aconitase is an enzyme that catalyses the stereo-specific isomerization of citrate to isocitrate via cis-aconitate in the tricarboxylic acid cycle, a non-redox-active process.- Function :

Acorn
The acorn, or oak nut, is the nut of the oaks and their close relatives . It usually contains a single seed , enclosed in a tough, leathery shell, and borne in a cup-shaped cupule. Acorns vary from 1–6 cm long and 0.8–4 cm broad

Acorn Archimedes
The Acorn Archimedes was Acorn Computers Ltd's first general purpose home computer to be based on their own ARM architecture.Using a RISC design with a 32-bit CPU, at its launch in June 1987, the Archimedes was stated as running at 4 MIPS, with a claim of 18 MIPS during tests.The name is commonly used to describe any of Acorn's contemporary designs based on the same architecture,

Acorn squash
Acorn squash , also called pepper squash or Des Moines squash, is a winter squash with distinctive longitudinal ridges and sweet, yellow-orange flesh

Acoustic guitar
An acoustic guitar is a guitar that uses only an acoustic sound board. The air in this cavity resonates with the vibrational modes of the string and at low frequencies, which depend on the size of the box, the chamber acts like a Helmholtz resonator, increasing or decreasing the volume of the sound again depending on whether the air in the box is moving in phase or out of phase with the

Acoustic neuroma
A vestibular schwannoma, often called an acoustic neuroma, is a benign primary intracranial tumor of the myelin-forming cells of the vestibulocochlear nerve . The term "vestibular schwannoma" involves the vestibular portion of the 8th cranial nerve and arises from Schwann cells, which are responsible for the myelin sheath in the peripheral nervous system

Acoustic resonance
Acoustic resonance is the tendency of an acoustic system to absorb more energy when it is forced or driven at a frequency that matches one of its own natural frequencies of vibration than it does at other frequencies.

Acoustical engineering
Acoustical engineering is the branch of engineering dealing with sound and vibration. It is the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers are typically concerned with the manipulation and control of sound.

Acoustics
Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer

Acquittal
In the common law tradition, an acquittal formally certifies the accused is free from the charge of an offense, as far as the criminal law is concerned. This is so even where the prosecution is abandoned nolle prosequi

Acre
The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. The most common use of the acre is to measure tracts of land.The acre is related to the square mile, with 640 acres making up one square mile

Acridine
Acridine, C13H9N, is an organic compound and a nitrogen heterocycle. Acridine is also used to describe compounds containing the C13N tricycle.

Acrobatics
Acrobatics is the performance of extraordinary feats of balance, agility and motor coordination. It can be found in many of the performing arts, as well as many sports

Acrolein
Acrolein is the simplest unsaturated aldehyde. It is produced widely but is most often immediately reacted with other products due to its instability and toxicity

Acropolis
Acropolis means "high city" in Greek, literally city on the extremity and is usually translated into English as Citadel . For purposes of defense, early people naturally chose elevated ground to build a new settlement, frequently a hill with precipitous sides

Acropora
Acropora is a genus of scleractinian coral in the Phylum Cnidaria. Some of its species are known as table coral, elkhorn coral and staghorn coral. There are currently 149 described species

Across the Bridge
Across the Bridge is a short story by Graham Greene.The story is told first-person by an unnamed narrator who reveals little about himself, other than that he is a wandering stranger stranded in a small Mexican border village. The narrator is fascinated by Joseph Calloway, a famous con-man believed to be extremely wealthy, who is in the Mexican village on the run from the law

Acrostic
An acrostic is a poem or other form of writing in which the first letter, syllable or word of each line, paragraph or other recurring feature in the text spells out a word or a message. As a form of constrained writing, an acrostic can be used as a mnemonic device to aid memory retrieval. A famous acrostic was made in Greek for the acclamation JESUS CHRIST, GOD'S SON, SAVIOUR