The Aztecs were a Mesoamerican culture that flourished in central Mexico in the post-classic period from 1300 to 1521. The Aztec peoples included different ethnic groups of central Mexico those groups who spoke the Nahuatl language and who dominated large parts of Mesoamerica from the 14th to the 16th centuries. Aztec culture was organized into city-states, some of which joined to form alliances, political confederations, or empires; the Aztec empire was a confederation of three city-states established in 1427, city-state of the Mexica or Tenochca. Although the term Aztecs is narrowly restricted to the Mexica of Tenochtitlan, it is broadly used to refer to Nahua polities or peoples of central Mexico in the prehispanic era, as well as the Spanish colonial era; the definitions of Aztec and Aztecs have long been the topic of scholarly discussion since German scientist Alexander von Humboldt established its common usage in the early nineteenth century. Most ethnic groups of central Mexico in the post-classic period shared basic cultural traits of Mesoamerica, so many of the traits that characterize Aztec culture cannot be said to be exclusive to the Aztecs.
For the same reason, the notion of "Aztec civilization" is best understood as a particular horizon of a general Mesoamerican civilization. The culture of central Mexico includes maize cultivation, the social division between nobility and commoners, a pantheon, the calendric system of a xiuhpohualli of 365 days intercalated with a tonalpohualli of 260 days. Particular to the Mexica of Tenochtitlan was the patron God Huitzilopochtli, twin pyramids, the ceramic ware known as Aztec I to IV. From the 13th century, the Valley of Mexico was the heart of dense population and the rise of city-states; the Mexica were late-comers to the Valley of Mexico, founded the city-state of Tenochtitlan on unpromising islets in Lake Texcoco becoming the dominant power of the Aztec Triple Alliance or Aztec Empire. It was a tributary empire that expanded its political hegemony far beyond the Valley of Mexico, conquering other city states throughout Mesoamerica in the late post-classic period, it originated in 1427 as an alliance between the city-states Tenochtitlan and Tlacopan.
Soon Texcoco and Tlacopan were relegated to junior partnership in the alliance, with Tenochtitlan the dominant power. The empire extended its reach by a combination of trade and military conquest, it was never a true territorial empire controlling a territory by large military garrisons in conquered provinces, but rather dominated its client city-states by installing friendly rulers in conquered territories, by constructing marriage alliances between the ruling dynasties, by extending an imperial ideology to its client city-states. Client city-states paid tribute to the Aztec emperor, the Huey Tlatoani, in an economic strategy limiting communication and trade between outlying polities, making them dependent on the imperial center for the acquisition of luxury goods; the political clout of the empire reached far south into Mesoamerica conquering polities as far south as Chiapas and Guatemala and spanning Mesoamerica from the Pacific to the Atlantic oceans. The empire reached its maximal extent in 1519, just prior to the arrival of a small group of Spanish conquistadors led by Hernán Cortés.
Cortés allied with city-states opposed to the Mexica the Nahuatl-speaking Tlaxcalteca as well as other central Mexican polities, including Texcoco, its former ally in the Triple Alliance. After the fall of Tenochtitlan on August 13, 1521 and the capture of the emperor Cuauhtemoc, the Spanish founded Mexico City on the ruins of Tenochtitlan. From there they proceeded with the process of conquest and incorporation of Mesoamerican peoples into the Spanish Empire. With the destruction of the superstructure of the Aztec Empire in 1521, the Spanish utilized the city-states on which the Aztec Empire had been built, to rule the indigenous populations via their local nobles; those nobles pledged loyalty to the Spanish crown and converted, at least nominally, to Christianity, in return were recognized as nobles by the Spanish crown. Nobles acted as intermediaries to convey tribute and mobilize labor for their new overlords, facilitating the establishment of Spanish colonial rule. Aztec culture and history is known through archaeological evidence found in excavations such as that of the renowned Templo Mayor in Mexico City.
Important for knowledge of post-conquest Nahuas was the training of indigenous scribes to write alphabetic texts in Nahuatl for local purposes under Spanish colonial rule. At its height, Aztec culture had rich and complex mythological and religious traditions, as well as achieving remarkable architectural and artistic accomplishments; the Nahuatl words and mean "people from Aztlan," a mythical place of origin for several ethnic groups in central Mexico. The term was not used as an endonym by Aztecs themselves, but it is
A tendon or sinew is a tough band of fibrous connective tissue that connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments. Ligaments join one bone to bone, while tendons connect muscle to bone for a proper functioning of the body. Histologically, tendons consist of dense regular connective tissue fascicles encased in dense irregular connective tissue sheaths. Normal healthy tendons are composed of parallel arrays of collagen fibers packed together, they are anchored to bone by Sharpey's fibres. The dry mass of normal tendons, which makes up about 30% of their total mass, is composed of about 86% collagen, 2% elastin, 1–5% proteoglycans, 0.2% inorganic components such as copper and calcium. The collagen portion is made up of 97–98% type I collagen, with small amounts of other types of collagen; these include type II collagen in the cartilaginous zones, type III collagen in the reticulin fibres of the vascular walls, type IX collagen, type IV collagen in the basement membranes of the capillaries, type V collagen in the vascular walls, type X collagen in the mineralized fibrocartilage near the interface with the bone.
Collagen fibres coalesce into macroaggregates. After secretion from the cell, the cleaved by procollagen N- and C-proteinases, the tropocollagen molecules spontaneously assemble into insoluble fibrils. A collagen molecule is about 300 nm long and 1–2 nm wide, the diameter of the fibrils that are formed can range from 50–500 nm. In tendons, the fibrils assemble further to form fascicles, which are about 10 mm in length with a diameter of 50–300 μm, into a tendon fibre with a diameter of 100–500 μm. Fascicles are bound by the endotendineum, a delicate loose connective tissue containing thin collagen fibrils. and elastic fibres. Groups of fascicles are bounded by the epitenon. Filling the interstitia within the fascia where the tendon is located is the paratenon a fatty areolar tissue; the collagen in tendons are held together with proteoglycan components including decorin and, in compressed regions of tendon, which are capable of binding to the collagen fibrils at specific locations. The proteoglycans are interwoven with the collagen fibrils – their glycosaminoglycan side chains have multiple interactions with the surface of the fibrils – showing that the proteoglycans are important structurally in the interconnection of the fibrils.
The major GAG components of the tendon are dermatan sulfate and chondroitin sulfate, which associate with collagen and are involved in the fibril assembly process during tendon development. Dermatan sulfate is thought to be responsible for forming associations between fibrils, while chondroitin sulfate is thought to be more involved with occupying volume between the fibrils to keep them separated and help withstand deformation; the dermatan sulfate side chains of decorin aggregate in solution, this behavior can assist with the assembly of the collagen fibrils. When decorin molecules are bound to a collagen fibril, their dermatan sulfate chains may extend and associate with other dermatan sulfate chains on decorin, bound to separate fibrils, therefore creating interfibrillar bridges and causing parallel alignment of the fibrils; the tenocytes produce the collagen molecules, which aggregate end-to-end and side-to-side to produce collagen fibrils. Fibril bundles are organized to form fibres with the elongated tenocytes packed between them.
There is a three-dimensional network of cell processes associated with collagen in the tendon. The cells communicate with each other through gap junctions, this signalling gives them the ability to detect and respond to mechanical loading. Blood vessels may be visualized within the endotendon running parallel to collagen fibres, with occasional branching transverse anastomoses; the internal tendon bulk is thought to contain no nerve fibres, but the epitenon and paratenon contain nerve endings, while Golgi tendon organs are present at the junction between tendon and muscle. Tendon length varies from person to person. Tendon length is, in practice, the deciding factor regarding potential muscle size. For example, all other relevant biological factors being equal, a man with a shorter tendons and a longer biceps muscle will have greater potential for muscle mass than a man with a longer tendon and a shorter muscle. Successful bodybuilders will have shorter tendons. Conversely, in sports requiring athletes to excel in actions such as running or jumping, it is beneficial to have longer than average Achilles tendon and a shorter calf muscle.
Tendon length is determined by genetic predisposition, has not been shown to either increase or decrease in response to environment, unlike muscles, which can be shortened by trauma, use imbalances and a lack of recovery and stretching. Traditionally, tendons have been considered to be a mechanism by which muscles connect to bone as well as muscles itself, functioning to transmit forces; this connection allows tendons to passively modulate forces during locomotion, providing additional stability with no active work. However, over the past two decades, much research focused on the elastic properties of some tendons and their ability to function as springs. Not all tendons are required to perform the same functional role, with some predominantly positioning limbs, such as the fingers when writing and others acting as springs to make locomotion more efficient. Energy storing tendons can recover energy at high efficiency. For example, during a human stride, the Achilles tendon stretches as the ankle joint dorsiflexes.
During the last portion of the stride, as the foot plantar-flexes (pointing the
Emergency medical services
Emergency medical services known as ambulance services or paramedic services, are emergency services which treat illnesses and injuries that require an urgent medical response, providing out-of-hospital treatment and transport to definitive care. They may be known as a first aid squad, FAST squad, emergency squad, rescue squad, ambulance squad, ambulance corps, life squad or by other initialisms such as EMAS or EMARS. In most places, the EMS can be summoned by members of the public via an emergency telephone number which puts them in contact with a control facility, which will dispatch a suitable resource to deal with the situation. Ambulances are the primary vehicles for delivering EMS, though some use cars, aircraft or boats. EMS agencies may operate the non-emergency patient transport service, some have units for technical rescue operations such as extrication, water rescue, search and rescue; as a first resort, the EMS provide treatment on the scene to those in need of urgent medical care.
If it is deemed necessary, they are tasked with transferring the patient to the next point of care. This is most an emergency department of a hospital. Ambulances only transported patients to care, this remains the case in parts of the developing world; the term "emergency medical service" was popularised when these services began to emphasise diagnosis and treatment at the scene. In some countries, a substantial portion of EMS calls do not result in a patient being taken to hospital. Training and qualification levels for members and employees of emergency medical services vary throughout the world. In some systems, members may be present who are qualified only to drive ambulances, with no medical training. In contrast, most systems have personnel who retain at least basic first aid certifications, such as basic life support. In English-speaking countries, they are known as emergency medical technicians and paramedics, with the latter having additional training such as advanced life support skills.
Physicians and nurses provide pre-hospital care to varying degrees in different countries. Emergency care in the field has been rendered in different forms since the beginning of recorded history; the New Testament contains the parable of the Good Samaritan, in which a man, beaten is cared for by a passing Samaritan. Luke 10:34 – "He went to him and bandaged his wounds, pouring on oil and wine, he put the man on his own donkey, took him to an inn and took care of him." During the Middle Ages, the Knights Hospitaller were known for rendering assistance to wounded soldiers in the battlefield. The first use of the ambulance as a specialized vehicle, in battle came about with the ambulances volantes designed by Dominique Jean Larrey, Napoleon Bonaparte's chief surgeon. Larrey was present at the battle of Spires, between the French and Prussians, was distressed by the fact that wounded soldiers were not picked up by the numerous ambulances until after hostilities had ceased, set about developing a new ambulance system.
Having decided against using the Norman system of horse litters, he settled on two- or four-wheeled horse-drawn wagons, which were used to transport fallen soldiers from the battlefield after they had received early treatment in the field. Larrey's projects for'flying ambulances' were first approved by the Committee of Public Safety in 1794. Larrey subsequently entered Napoleon's service during the Italian campaigns in 1796, where his ambulances were used for the first time at Udine and Milan, he adapted his ambulances to the conditions developing a litter which could be carried by a camel for a campaign in Egypt. A major advance was made with the introduction of a transport carriage for cholera patients in London during 1832; the statement on the carriage, as printed in The Times, said "The curative process commences the instant the patient is put in to the carriage. This tenet of ambulances providing instant care, allowing hospitals to be spaced further apart, displays itself in modern emergency medical planning.
The first known hospital-based ambulance service operated out of Commercial Hospital, Ohio by 1865. This was soon followed by other services, notably the New York service provided out of Bellevue Hospital which started in 1869 with ambulances carrying medical equipment, such as splints, a stomach pump and brandy, reflecting contemporary medicine. Another early ambulance service was founded by Jaromir V. Mundy, Count J. N. Wilczek, Eduard Lamezan-Salins in Vienna after the disastrous fire at the Vienna Ringtheater in 1881. Named the "Vienna Voluntary Rescue Society," it served as a model for similar societies worldwide. In June 1887 the St John Ambulance Brigade was established to provide first aid and ambulance services at public events in London, it was modelled on a military-style discipline structure. In the late 19th century, the automobile was being developed, in addition to horse-drawn models, early 20th century ambulances were powered by steam and electricity, reflecting the competing automotive technologies in existence.
However, the first motorized ambulance was brought into service in the last year of the 19th century, with the Michael Reese Hospital, Ch
A first responder is a person with specialized training, among the first to arrive and provide assistance at the scene of an emergency, such as an accident, natural disaster, or terrorist attack. First responders include paramedics, emergency medical technicians, police officers, firefighters and other trained members of organisations connected with this type of work. A certified first responder is one who has received certification to provide pre-hospital care in a certain jurisdiction, for example, the Certified First Responder in France. A community first responder is a person dispatched to attend medical emergencies until an ambulance arrives. A wilderness first responder is trained to provide pre-hospital care in remote settings and will therefore have skills in ad hoc patient packaging and transport by non-motorized means. First responders must be trained to deal with a wide array of potential medical emergencies; because of the high level of stress and uncertainty associated with the position, first responders must maintain physical and mental health.
With such preparation, first responders face unique risks of being the first people to aid those with unknown contagions. For example, in 2003 first responders were among the earliest victims of the unknown SARS virus, when they cared for patients affected with the virus. Trauma and first responders Some jurisdictions have special laws defining and establishing the rights and duties of first responders; the term first responder is defined in U. S. Homeland Security Presidential Directive, HSPD-8 and reads: The term "first responder" refers to those individuals who in the early stages of an incident are responsible for the protection and preservation of life, property and the environment, including emergency response providers as defined in section 2 of the Homeland Security Act of 2002, as well as emergency management, public health, clinical care, public works, other skilled support personnel that provide immediate support services during prevention and recovery operations. Emergency response providers are defined by 6 U.
S. C. § 101 as follows: The term “emergency response providers” includes Federal and local governmental and nongovernmental emergency public safety, law enforcement, emergency response, emergency medical services providers, related personnel and authorities. First aider Emergency medical responder levels by U. S. state
The 18th century lasted from January 1, 1701 to December 31, 1800 in the Gregorian calendar. During the 18th century, elements of Enlightenment thinking culminated in the American and Haitian revolutions; this was an age of violent slave trading, global human trafficking. The reactions against monarchical and aristocratic power helped fuel the revolutionary responses against it throughout the century. In continental Europe, philosophers dreamed of a brighter age. For some, this dream turned into a reality with the French Revolution of 1789, though compromised by the excesses of the Reign of Terror under Maximilien Robespierre. At first, many monarchies of Europe embraced Enlightenment ideals, but with the French Revolution they feared losing their power and formed broad coalitions for the counter-revolution; the Ottoman Empire experienced an unprecedented period of peace and economic expansion, taking part in no European wars from 1740 to 1768. As a consequence the empire did not share in Europe's military improvements during the Seven Years' War, causing its military to fall behind and suffer defeats against Russia in the second half of the century.
18th century music included the classical period. The 18th century marked the end of the Polish–Lithuanian Commonwealth as an independent state; the once-powerful and vast kingdom, which had once conquered Moscow and defeated great Ottoman armies, collapsed under numerous invasions. Its semi-democratic government system was not robust enough to rival the neighboring monarchies of the Kingdom of Prussia, the Russian Empire and the Austrian Empire which divided the Commonwealth territories between themselves, changing the landscape of Central European politics for the next hundred years. European colonization of the Americas and other parts of the world intensified and associated mass migrations of people grew in size as the Age of Sail continued. Great Britain became a major power worldwide with the French and Indian War in the 1760s and the conquest of large parts of India. However, Britain lost many of its North American colonies after the American Revolution and Indian wars. Napoleon Bonaparte, formed the Franco-Indian alliance with Indian ruler Tipu Sultan and his father emperor Hyder Ali and learnt more about Quran and Islam from them.
Tipu Sultan embarked on an ambitious economic development program that established Mysore Empire as a major economic power, with some of the world's highest real wages and living standards in the late 18th century. Under his reign, Mysore overtook the wealthy Bengal Subah as India's dominant economic power, with productive agriculture and textile manufacturing. Mysore's average income was five times higher than subsistence level at the time. Along his father, he used their French-trained army in alliance and won important victories against the British Empire in the Second Anglo-Mysore War and negotiated the Treaty of Mangalore in 1784; the defeat of the British resulted in the formation of the newly independent United States. The Industrial Revolution started in Britain in the 1770s with the production of the improved steam engine. Despite its modest beginnings in the 18th century, steam-powered machinery would radically change human society and the environment. Western historians have defined the 18th century otherwise for the purposes of their work.
For example, the "short" 18th century may be defined as 1715–1789, denoting the period of time between the death of Louis XIV of France and the start of the French Revolution, with an emphasis on directly interconnected events. To historians who expand the century to include larger historical movements, the "long" 18th century may run from the Glorious Revolution of 1688 to the Battle of Waterloo in 1815 or later. 1700–1721: Great Northern War between the Russian and Swedish Empires. 1701: Kingdom of Prussia declared under King Frederick I. 1701–1714: The War of the Spanish Succession is fought, involving most of continental Europe. 1702–1715: Camisard Rebellion in France. 1703: Saint Petersburg is founded by Peter the Great. 1703–1711: The Rákóczi Uprising against the Habsburg Monarchy. 1704: End of Japan's Genroku period. 1704: First Javanese War of Succession. 1706–1713: The War of the Spanish Succession: French troops defeated at the battles of Ramillies and Turin. 1707: The Act of Union is passed, merging the Scottish and English Parliaments, thus establishing the Kingdom of Great Britain.
1708: The Company of Merchants of London Trading into the East Indies and English Company Trading to the East Indies merge to form the United Company of Merchants of England Trading to the East Indies. 1708–1709: Famine kills one-third of East Prussia's population. 1709: The Great Frost of 1709 marks the coldest winter in 500 years. 1710: The world's first copyright legislation, Britain's Statute of Anne, takes effect. 1710–1711: Ottoman Empire fights Russia in the Russo-Turkish War. 1711–1715: Tuscarora War between British and German settlers and the Tuscarora people of North Carolina. 1715: The first Jacobite rising breaks out. 1716: Establishment of the Sikh Confederacy along the present-day India-Pakistan border. 1718: The city of New Orleans is founded by the French in North America. 1718–1730: Tulip period of the Ottoman Empire. 1719: Second Javanese War of Succession. 1720: The South Sea Bubble. 1720–1721: The Great Plague of Marseille. 1721: The Treaty of Nystad is signed, ending the Great Northern War.
1722–1723: Russo-Persian War. 1722–1725: Controversy over William Wood's halfpence leads to the Drapier's Letters and
A splint is a device used for support or immobilization of a limb or the spine. It can be used in multiple situations, including temporary immobilization of broken bones or damaged joints and support for joints during activity. A "splint" in considered Non-circumferential. A physician must decide the proper treatment, for a particular injury, to promote healing as well as know the benefits and risks. A splint can be used for certain fractures, soft tissue sprains or tendon injuries, or injuries awaiting orthopedic treatment. A splint may be static, not allowing dynamic, allowing controlled motion. By the emergency medical services or by volunteer first responders, to temporarily immobilize a fractured limb before transportation. Ankle Stirrup – Used for the ankles. Finger Splints – Used for the fingers. A "mallet" or baseball finger is a rupture of the extensor tendon and sometimes including a fracture. While surgery may be necessary such an injury may heal. Nasal splint Posterior Lower Leg Posterior Full Leg Posterior Elbow Sugar Tong – Used for the forearm or wrist.
They are named "sugar-tong" due to their long, U-shaped characteristics, similar to a type of utensil used to pick up sugar cubes. Thumb Spica – Used for the thumb. Ulnar Gutter – Used for the forearm to the palm. Volar Wrist Splint – Used for the wrist. Wrist/arm splint – Used for the wrist or arm. Different forms of the splint have been used sparingly throughout history. Consisting of two small wooden planks, the splint was tied around the fracture with rope, cloth, or rawhide during frontier times in American history. To this day, the splint is used to secure small fractures and breaks. Hugh Owen Thomas invented several types of splints but it was not until WWI that his nephew, Sir Robert Jones began using the splint on soldiers. Spica splint SAM Splint Traction splint Vacuum splint Cervical collar Extrication splint Long spine board Orthopedic surgery Buddy wrapping PASG Home Treatment for Finger, Hand & Wrist Injuries on WebMD Cast & Splint Care Tips on WebMD
International Standard Serial Number
An International Standard Serial Number is an eight-digit serial number used to uniquely identify a serial publication, such as a magazine. The ISSN is helpful in distinguishing between serials with the same title. ISSN are used in ordering, interlibrary loans, other practices in connection with serial literature; the ISSN system was first drafted as an International Organization for Standardization international standard in 1971 and published as ISO 3297 in 1975. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard; when a serial with the same content is published in more than one media type, a different ISSN is assigned to each media type. For example, many serials are published both in electronic media; the ISSN system refers to these types as electronic ISSN, respectively. Conversely, as defined in ISO 3297:2007, every serial in the ISSN system is assigned a linking ISSN the same as the ISSN assigned to the serial in its first published medium, which links together all ISSNs assigned to the serial in every medium.
The format of the ISSN is an eight digit code, divided by a hyphen into two four-digit numbers. As an integer number, it can be represented by the first seven digits; the last code digit, which may be 0-9 or an X, is a check digit. Formally, the general form of the ISSN code can be expressed as follows: NNNN-NNNC where N is in the set, a digit character, C is in; the ISSN of the journal Hearing Research, for example, is 0378-5955, where the final 5 is the check digit, C=5. To calculate the check digit, the following algorithm may be used: Calculate the sum of the first seven digits of the ISSN multiplied by its position in the number, counting from the right—that is, 8, 7, 6, 5, 4, 3, 2, respectively: 0 ⋅ 8 + 3 ⋅ 7 + 7 ⋅ 6 + 8 ⋅ 5 + 5 ⋅ 4 + 9 ⋅ 3 + 5 ⋅ 2 = 0 + 21 + 42 + 40 + 20 + 27 + 10 = 160 The modulus 11 of this sum is calculated. For calculations, an upper case X in the check digit position indicates a check digit of 10. To confirm the check digit, calculate the sum of all eight digits of the ISSN multiplied by its position in the number, counting from the right.
The modulus 11 of the sum must be 0. There is an online ISSN checker. ISSN codes are assigned by a network of ISSN National Centres located at national libraries and coordinated by the ISSN International Centre based in Paris; the International Centre is an intergovernmental organization created in 1974 through an agreement between UNESCO and the French government. The International Centre maintains a database of all ISSNs assigned worldwide, the ISDS Register otherwise known as the ISSN Register. At the end of 2016, the ISSN Register contained records for 1,943,572 items. ISSN and ISBN codes are similar in concept. An ISBN might be assigned for particular issues of a serial, in addition to the ISSN code for the serial as a whole. An ISSN, unlike the ISBN code, is an anonymous identifier associated with a serial title, containing no information as to the publisher or its location. For this reason a new ISSN is assigned to a serial each time it undergoes a major title change. Since the ISSN applies to an entire serial a new identifier, the Serial Item and Contribution Identifier, was built on top of it to allow references to specific volumes, articles, or other identifiable components.
Separate ISSNs are needed for serials in different media. Thus, the print and electronic media versions of a serial need separate ISSNs. A CD-ROM version and a web version of a serial require different ISSNs since two different media are involved. However, the same ISSN can be used for different file formats of the same online serial; this "media-oriented identification" of serials made sense in the 1970s. In the 1990s and onward, with personal computers, better screens, the Web, it makes sense to consider only content, independent of media; this "content-oriented identification" of serials was a repressed demand during a decade, but no ISSN update or initiative occurred. A natural extension for ISSN, the unique-identification of the articles in the serials, was the main demand application. An alternative serials' contents model arrived with the indecs Content Model and its application, the digital object identifier, as ISSN-independent initiative, consolidated in the 2000s. Only in 2007, ISSN-L was defined in the