1.
Attic Greek
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Attic Greek is the Greek dialect of ancient Attica, including of the city of Athens. Of the ancient dialects, it is the most similar to later Greek and is the form of the language that is studied in ancient Greek language courses. Attic Greek is sometimes included in the Ionic dialect, together, Attic and Ionic are the primary influences on Modern Greek. Greek is the member of the Hellenic branch of the Indo-European language family. In ancient times, Greek had already come to exist in several dialects, mycenaean Greek represents an early form of Eastern Greek, the group to which Attic also belongs. Later Greek literature wrote about three main dialects, Aeolic, Doric, and Ionic, Attic was part of the Ionic dialect group, ruling from Alexandria, Ptolemy launched the Alexandrian period, during which the city of Alexandria and its expatriate Greek-medium scholars flourished. The earliest Greek literature, which is attributed to Homer and is dated to the 8th or 7th centuries BC, is written in Old Ionic rather than Attic. The first extensive works of literature in Attic are the plays of the dramatists Aeschylus, the military exploits of the Athenians led to some universally read and admired history, as found in the works of Thucydides and Xenophon. Slightly less known because they are technical and legal are the orations by Antiphon, Demosthenes, Lysias, Isocrates. The Attic Greek of the philosophers Plato and his student Aristotle dates to the period of transition between Classical Attic and Koine, Attic Greek, like other dialects, was originally written in a local variant of the Greek alphabet. In other respects, Old Attic shares many features with the neighbouring Euboean alphabet, like the latter, it used an L-shaped variant of lambda and an S-shaped variant of sigma. It lacked the consonant symbols xi for /ks/ and psi for /ps/, expressing these sound combinations with ΧΣ, moreover, like most other mainland Greek dialects, Attic did not yet use omega and eta for the long vowels /ɔ, / and /ɛ, /. Instead, it expressed the vowel phonemes /o, oː, ɔː/ with the letter Ο and /e, eː, moreover, the letter Η was used as heta, with the consonantal value of /h/ rather than the vocalic value of /ɛː/. In the 5th century, Athenian writing gradually switched from this system to the more widely used Ionic alphabet, native to the eastern Aegean islands. This new system, also called the Eucleidian alphabet, after the name of the archon Eucleides, the classical works of Attic literature were subsequently handed down to posterity in the new Ionic spelling, and it is the classical orthography in which they are read today. Proto-Greek long ā → Attic long ē, but ā after e, i, r, ⁓ Ionic ē in all positions. ⁓ Doric and Aeolic ā in all positions, Proto-Greek and Doric mātēr → Attic mētēr mother Attic chōrā ⁓ Ionic chōrē place, country However, Proto-Greek ā → Attic ē after w, deleted by the Classical Period. Proto-Greek korwā → early Attic-Ionic *korwē → Attic korē Proto-Greek ă → Attic ě, Doric Artamis ⁓ Attic Artemis Compensatory lengthening of vowel before cluster of sonorant and s, after deletion of s
2.
Physiology
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Physiology is the scientific study of normal mechanisms, and their interactions, which operate within a living system. A sub-discipline of biology, its focus is in how organisms, organ systems, organs, cells, and biomolecules carry out the chemical or physical functions that exist in a living system. Given the size of the field, it is divided into, among others, animal physiology, plant physiology, cellular physiology, microbial physiology, bacterial physiology, and viral physiology. The Nobel Prize in Physiology or Medicine is awarded to those who make significant achievements in this discipline by the Royal Swedish Academy of Sciences. In medicine, a state is one occurring from normal body function, rather than pathologically. Physiological studies date back to the ancient civilizations of India and Egypt alongside anatomical studies, the study of human physiology as a medical field dates back to at least 420 BC to the time of Hippocrates, also known as the father of medicine. Hippocrates incorporated his belief called the theory of humours, which consisted of four basic substance, earth, water, air. Each substance is known for having a corresponding humour, black bile, phlegm, blood and yellow bile, Hippocrates also noted some emotional connections to the four humours, which Claudis Galenus would later expand on. The critical thinking of Aristotle and his emphasis on the relationship between structure and function marked the beginning of physiology in Ancient Greece. Like Hippocrates, Aristotle took to the theory of disease. Claudius Galenus, known as Galen of Pergamum, was the first to use experiments to probe the functions of the body, unlike Hippocrates though, Galen argued that humoral imbalances can be located in specific organs, including the entire body. His modification of this theory better equipped doctors to more precise diagnoses. Galen was also the founder of experimental physiology, and for the next 1,400 years, Galenic physiology was a powerful and influential tool in medicine. Jean Fernel, a French physician, introduced the term physiology, inspired in the work of Adam Smith, Milne-Edwards wrote that the body of all living beings, whether animal or plant, resembles a factory. Where the organs, comparable to workers, work incessantly to produce the phenomena that constitute the life of the individual, in more differentiated organisms, the functional labor could be apportioned between different instruments or systems. In 1858, Joseph Lister studied the cause of blood coagulation and inflammation that resulted after previous injuries and he later discovered and implemented antiseptics in the operating room, and as a result decreases death rate from surgery by a substantial amount. The Physiological Society was founded in London in 1876 as a dining club, the American Physiological Society is a nonprofit organization that was founded in 1887. The Society is, devoted to fostering education, scientific research, in 1891, Ivan Pavlov performed research on conditional reflexes that involved dogs saliva production in response to a plethora of sounds and visual stimuli
3.
Lester Frank Ward
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Lester F. Ward was an American botanist, paleontologist, and sociologist. He served as the first president of the American Sociological Association, Ward promoted the introduction of sociology courses into American higher education. His belief that society could be controlled was especially attractive to intellectuals during the Progressive Era. His influence in certain circles was affected by his opinions regarding organized priesthoods, Ward emphasized universal and comprehensive public schooling to provide the public with the knowledge a democracy needs to successfully govern itself. A collection of Wards writings and photographs is maintained by the Special Collections Research Center of the George Washington University, the collection includes articles, diaries, correspondence, and a scrapbook. GWUs Special Collections Research Center is located in the Estelle and Melvin Gelman Library and it doesnt seem the thing to do. You are the one to write my biography from all the data that I shall leave, Lester Frank Ward was born in Joliet, Illinois, the youngest of 10 children born to Justus Ward and his wife Silence Rolph Ward. Justus Ward was of old New England colonial stock, but he wasnt rich, Silence Ward was the daughter of a clergyman, she was a talented perfectionist, educated and fond of literature. When Lester Frank was one year of age the family moved closer to Chicago, to a place called Cass, now known as Downers Grove, Illinois about twenty-three miles from Lake Michigan. The family then moved to a homestead in nearby St. Charles, Ward first attended a formal school at St. Charles, Kane County, Illinois, in 1850 when he was nine years old. He was known as Frank Ward to his classmates and friends and showed an enthusiasm for books and learning. Four years after Ward started attending school, his parents, along with Lester, four years later, in 1858, Justus Ward unexpectedly died, and the boys returned the family to the old homestead they still owned in St. Charles. Wards estranged mother, who lived two miles away with Wards sister, disapproved of the move, and wanted the boys to stay in Iowa to continue their fathers work. In late 1858 the two moved to Pennsylvania at the invitation of Lester Franks oldest brother Cyrenus who was starting a business making wagon wheel hubs. The brothers saw this as an opportunity to move closer to civilization and to eventually attend college. The business failed, however, and Lester Frank, who didnt have the money to attend college, found a job teaching in a small country school. He finally saved the money to attend college and enrolled in the Susquehanna Collegiate Institute in 1860, while he was at first self-conscious about his spotty formal education and self learning, he soon found that his knowledge compared favorably to his classmates, and he was rapidly promoted. It was while attending the Susquehanna Collegiate Institute that he met Elizabeth Lizzie Carolyn Vought and their rather torrid love affair was documented in Wards first journal Young Wards Diary
4.
Stigmergy
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Stigmergy is a consensus mechanism of indirect coordination, through the environment, between agents or actions. The principle is that the left in the environment by an action stimulates the performance of a next action. In that way, subsequent actions tend to reinforce and build on other, leading to the spontaneous emergence of coherent. Stigmergy is a form of self-organization and it produces complex, seemingly intelligent structures, without need for any planning, control, or even direct communication between the agents. As such it supports efficient collaboration between extremely simple agents, who lack any memory, intelligence or even awareness of each other. The term stigmergy was introduced by French biologist Pierre-Paul Grassé in 1959 to refer to termite behavior and he defined it as, Stimulation of workers by the performance they have achieved. O. Stigmergy is now one of the key concepts in the field of swarm intelligence, Stigmergy was first observed in social insects. For example, ants exchange information by laying down pheromones on their way back to the nest when they have found food, in that way, they collectively develop a complex network of trails, connecting the nest in the most efficient way to the different food sources. When ants come out of the nest searching for food, they are stimulated by the pheromone to follow the trail towards the food source, the network of trails functions as a shared external memory for the ant colony. Other eusocial creatures, such as termites, use pheromones to build their nests by following a simple decentralized rule set. Each insect scoops up a mudball or similar material from its environment, invests the ball with pheromones, however, termites are attracted to their nestmates pheromones and are therefore more likely to drop their own mudballs on top of their neighbors. The larger the heap of mud becomes, the more attractive it is, over time this leads to the construction of pillars, arches, tunnels and chambers. Spectacular examples of behavior can be found among the myxobacteria. Myxobacteria travel in swarms containing many cells kept together by intercellular molecular signals, most myxobacteria are predatory, individuals benefit from aggregation as it allows accumulation of extracellular enzymes which are used to digest prey microorganisms. When nutrients are scarce, myxobacterial cells aggregate into fruiting bodies, the fruiting process is thought to benefit myxobacteria by ensuring that cell growth is resumed with a group of myxobacteria, rather than isolated cells. Similar life cycles have developed among the cellular slime molds, the best known of the myxobacteria, Myxococcus xanthus and Stigmatella aurantiaca, are studied in various laboratories as prokaryotic models of development. On the Internet there are many collective projects where users interact only by modifying parts of their shared virtual environment. Wikipedia is an example of this, in addition the concept of stigmergy has also been used to describe how cooperative work such as building design may be integrated
5.
Self-assembly
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When the constitutive components are molecules, the process is termed molecular self-assembly. Self-assembly can be classified as either static or dynamic, in static self-assembly, the ordered state forms as a system approaches equilibrium, reducing its free energy. These structures are described as self-organized. Self-assembly in the classic sense can be defined as the spontaneous, self-assembled nano-structure is an object that appears as a result of ordering and aggregation of individual nano-scale objects guided by some physical principle. Self-assembled nanostructure arises in the strong non-equilibrium conditions, the most famous example of self-assembly phenomenon is the occurrence of the life on Earth. It is plausible to hypothesize that it happens because the sun generates a strong gradient in its environment. This general idea has been confirmed in the experiment of self-assembly of carbon nanotubes, another interesting example of self-assembly is the phenomenon of electrostatic trapping. In this case a field is applied between two metallic nano-electrodes. The particles present in the environment are polarized by the electric field. Due to dipole interaction with the field gradient the particles are attracted to the gap between the electrodes. Fabricating a crystal by placing atom after atom is not realistic, however self-assembly of crystals works well. Similarly fabricating a 3D nano-structure is not realistic as well, self-assembly of 3D nano-structure becomes an easy and inexpensive way to fabricate them. Nano-structures such as gaps are used for storing energy and nuclear energy conversion. Self-assembled tunable materials are promising candidates for large surface area electrodes in batteries and organic photovoltaic cells, at this point, one may argue that any chemical reaction driving atoms and molecules to assemble into larger structures, such as precipitation, could fall into the category of SA. However, there are at least three distinctive features that make SA a distinct concept, first, the self-assembled structure must have a higher order than the isolated components, be it a shape or a particular task that the self-assembled entity may perform. This is generally not true in chemical reactions, where a state may proceed towards a disordered state depending on thermodynamic parameters. The second important aspect of SA is the key role of interactions with respect to more traditional covalent, ionic. Although typically less energetic by a factor of 10, these interactions play an important role in materials synthesis
6.
Complex system
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Complex systems present problems both in mathematical modelling and philosophical foundations. The subject is also called complex systems theory, complexity science, study of complex systems, complex networks, network science. Such a systems approach is used in computer science, biology, economics, physics, chemistry, architecture. A variety of abstract theoretical complex systems is studied as a field of mathematics, the key problems of complex systems are difficulties with their formal modelling and simulation. From such a perspective, in different research contexts complex systems are defined on the basis of their different attributes, since all complex systems have many interconnected components, the science of networks and network theory are important and useful tools for the study of complex systems. A theory for the resilience of system of systems represented by a network of interdependent networks was developed by Buldyrev et al, a consensus regarding a single universal definition of complex system does not yet exist. For systems that are less usefully represented with various other kinds of narratives. The study of complex system models is used for many scientific questions poorly suited to the traditional mechanistic conception provided by science. Linear systems represent the class of systems for which general techniques for stability control. However, many systems are inherently complex systems in terms of the definition above. This debate would notably lead economists, politicians and other parties to explore the question of computational complexity, gregory Bateson played a key role in establishing the connection between anthropology and systems theory, he recognized that the interactive parts of cultures function much like ecosystems. The first research institute focused on systems, the Santa Fe Institute, was founded in 1984. Today, there are over 50 institutes and research focusing on complex systems. The traditional approach to dealing with complexity is to reduce or constrain it, typically, this involves compartmentalisation, dividing a large system into separate parts. Organizations, for instance, divide their work into departments that deal with separate issues. Engineering systems are designed using modular components. However, modular designs become susceptible to failure when issues arise that bridge the divisions, as projects and acquisitions become increasingly complex, companies and governments are challenged to find effective ways to manage mega-acquisitions such as the Army Future Combat Systems. Acquisitions such as the FCS rely on a web of interrelated parts which interact unpredictably, over the last decades, within the emerging field of complexity economics new predictive tools have been developed to explain economic growth
7.
Hominini
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Members of the human clade, that is, the Hominina, including Homo and those species of the australopithecines that arose after the split from the chimpanzees, are called homininans. Not all homininans are directly related to the emergence of early Homo and this is a modern cladogram, For each clade, the cladogram above shows approximately when newer extant clades emerged. Some texts refer to Homonini as the Hominina branch, the subtribe Hominina is the human branch, that is, it contains only the genus Homo. Researchers proposed the taxon Hominini on the basis that the least similar species of a trichotomy should be separated from the other two. The common chimpanzee and the bonobo of the genus Pan are the closest living relatives to humans. All the extinct genera listed to the right are ancestral to, or offshoots of, however, both Orrorin and Sahelanthropus existed around the time of the split, and so may be ancestral to both Pan and Homo. In the proposal of Mann and Weiss, the tribe Hominini includes Pan as well as Homo, Homo and all bipedal apes are referred to the subtribe Hominina, while Pan is assigned to the subtribe Panina. Wood discusses the different views of this taxonomy, the assumption of late hybridization was in particular based on the similarity of the X chromosome in humans and chimpanzees, suggesting a divergence as late as some 4 million years ago. Sahelanthropus tchadensis is an extinct species that lived seven million years ago. Human Timeline – Smithsonian, National Museum of Natural History
8.
Polarization (politics)
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In the world of politics, polarization can refer to the divergence of political attitudes to ideological extremes. Polarization can refer to such divergence like public opinion or even to such divergence within certain groups, almost all discussions of polarization in political science consider polarization in the context of political parties and democratic systems of government. When polarization occurs in a two-party system, like the United States, moderate voices often lose power, Polarization is both a state and a process. Polarization as a state refers to the extent to which opinions on an issue are opposed in relation to some theoretical maximum, Polarization as a process refers to the increase in such opposition over time. Some political scientists argue that polarization requires divergence on a range of issues based on a consistent set of beliefs. Others argue polarization occurs when there are stark partisan or ideological divides, Political scientists typically distinguish between two types of political polarization, elite polarization and popular polarization. Elite polarization refers to the polarization of political elites, like party organizers and elected officials, while popular polarization refers to polarization in the electorate, in either context, opinions and policy positions are characterized by strict adherence to party lines. Elite polarization and popular polarization can occur at the time or independently of each other. A central issue in the study of political polarization is investigating the relationship between elite polarization and popular polarization, particularly any causal relationships between the two, elite polarization refers to polarization in the party-in-government and party-as-organization. It occurs when party members grow more internally homogenous on policy positions, Polarized political parties are internally cohesive and unified, programmatic, and ideologically distinct, and are typically found in a parliamentary system of democratic governance. In a two-party system like the U. S and this leads to the conflation of political parties and ideologies and the collapse of the ideological center. The vast majority of studies on elite polarization focus on legislative and deliberative bodies, there is much more research on polarization in Congress than on polarization in the other branches of government or in state governments. Popular polarization occurs when the electorates attitudes towards political issues, policies, members of the electorate and general public typically become less moderate in cases of popular polarization. Many political scientists consider political polarization a top-down process, in which elite polarization leads to - or at least precedes - popular polarization, yet polarization amongst elites does not necessarily produce polarization within the electorate, and polarized electoral choices can often reflect elite polarization rather than voters preferences. Political scientists studying popular polarization typically rely on data from opinion polls, Political scientists typically limit their inquiry to issues and questions that have been constant over time, in order to compare the present day to what the political climate has historically been. Political scientists have identified a variety of causes of political polarization, including parties, redistricting, the publics political ideology. Some scholars argue that diverging parties have one of the major driving forces of polarization as policy platforms have become more distant. This theory is based on recent trends in the United States Congress, the adoption of more ideologically distinct positions by political parties can cause polarization amongst both elites and the electorate
9.
Attack on Pearl Harbor
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The attack, also known as the Battle of Pearl Harbor, led to the United States entry into World War II. The Japanese military leadership referred to the attack as the Hawaii Operation and Operation AI, Japan intended the attack as a preventive action to keep the U. S. Pacific Fleet from interfering with military actions they planned in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States. Over the next seven hours there were coordinated Japanese attacks on the U. S. -held Philippines, Guam and Wake Island and on the British Empire in Malaya, Singapore, the attack commenced at 7,48 a. m. The base was attacked by 353 Imperial Japanese fighter planes, bombers, all eight U. S. Navy battleships were damaged, with four sunk. All but the USS Arizona were later raised, and six were returned to service, the Japanese also sank or damaged three cruisers, three destroyers, an anti-aircraft training ship, and one minelayer. 188 U. S. aircraft were destroyed,2,403 Americans were killed and 1,178 others were wounded. Important base installations such as the station, shipyard, maintenance. Japanese losses were light,29 aircraft and five midget submarines lost, one Japanese sailor, Kazuo Sakamaki, was captured. The surprise attack came as a shock to the American people. The following day, December 8, the United States declared war on Japan, the U. S. responded with a declaration of war against Germany and Italy. Domestic support for non-interventionism, which had been fading since the Fall of France in 1940, Roosevelt to proclaim December 7,1941, a date which will live in infamy. Because the attack happened without a declaration of war and without explicit warning, over the next decade, Japan continued to expand into China, leading to all-out war between those countries in 1937. Japan spent considerable effort trying to isolate China and achieve sufficient resource independence to attain victory on the mainland, from December 1937, events such as the Japanese attack on USS Panay, the Allison incident, and the Nanking Massacre swung public opinion in the West sharply against Japan. Fearing Japanese expansion, the United States, the United Kingdom, in 1940, Japan invaded French Indochina in an effort to control supplies reaching China. The United States halted shipments of airplanes, parts, machine tools, and aviation gasoline to Japan, an invasion of the Philippines was also considered necessary by Japanese war planners. War Plan Orange had envisioned defending the Philippines with a 40 and this was opposed by Douglas MacArthur, who felt that he would need a force ten times that size, and was never implemented. By 1941, U. S. planners anticipated abandonment of the Philippines at the outbreak of war and orders to that effect were given in late 1941 to Admiral Thomas Hart, commander of the Asiatic Fleet
10.
Bay of Pigs Invasion
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The Bay of Pigs Invasion was a failed military invasion of Cuba undertaken by the CIA-sponsored paramilitary group Brigade 2506 on 17 April 1961. Launched from Guatemala and Nicaragua, the force was defeated within three days by the Cuban Revolutionary Armed Forces, under the direct command of Prime Minister Fidel Castro. The Presidential coup of 1952 led by General Fulgencio Batista, against President Carlos Prio, President Prios exile was the reason for the 26th July Movement led by Fidel Castro. The movement, which did not succeed until after the Cuban Revolution of December 31,1958, severed the countrys formerly strong links with the US after nationalizing American economic assets. It was after the Cuban Revolution of 1959, that Fidel Castro forged strong links with the Soviet Union, with whom, at the time. US President Dwight D. Eisenhower was very concerned at the direction Castros government was taking, the CIA proceeded to organize the operation with the aid of various Cuban counter-revolutionary forces, training Brigade 2506 in Guatemala. Eisenhowers successor John F. Kennedy approved the invasion plan on 4 April 1961. Over 1,400 paramilitaries, divided into five battalions and one paratrooper battalion. Two days later, on 15 April, eight CIA-supplied B-26 bombers attacked Cuban airfields, on the night of 16 April, the main invasion landed at a beach named Playa Girón in the Bay of Pigs. It initially overwhelmed a local revolutionary militia, the Cuban Armys counter-offensive was led by José Ramón Fernández, before Castro decided to take personal control of the operation. As the US involvement became apparent to the world, Kennedy decided against providing further air cover for the invasion, as a result, the operation only had half the forces the CIA had deemed necessary. The original plan devised during Eisenhowers presidency had required both air and naval support, on 20 April, the invaders surrendered after only three days, with the majority being publicly interrogated and put into Cuban prisons. The failed invasion helped to strengthen the position of Castros leadership, made him a national hero and it also strengthened the relations between Cuba and the Soviet Union. This eventually led to the events of the Cuban Missile Crisis of 1962, the invasion was a major failure for US foreign policy, Kennedy ordered a number of internal investigations across Latin America. Cuban forces under Castros leadership clashed directly with US forces during the Invasion of Grenada over 20 years later, for centuries, Cuba was home of the Spanish Empire. The US subsequently invaded the island, and forced the Spanish army out, subsequently, large numbers of US settlers and businessmen arrived in Cuba, and by 1905, 60% of rural properties were owned by non-Cuban North Americans. Between 1906 and 1909,5,000 US Marines were stationed across the island, many opponents of the Batista regime took to armed rebellion in an attempt to oust the government, sparking the Cuban Revolution. Another was the Directorio Revolucionario Estudantil, which had been founded by the Federation of University Students President José Antonio Echevarría, however, the best known of these anti-Batista groups was the 26th of July Movement, founded by a lawyer named Fidel Castro
11.
IEEE-488
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IEEE488 is a short-range digital communications 8-bit parallel multi-master interface bus specification. IEEE488 was created as HP-IB and is commonly called GPIB and it has been the subject of several standards. Newer standards have largely replaced IEEE488 for computer use, in the late 1960s, Hewlett-Packard manufactured various automated test and measurement instruments, such as digital multimeters and logic analyzers. They developed the HP Interface Bus to enable easier interconnection between instruments and controllers, the bus was relatively easy to implement using the technology at the time, using a simple parallel bus and several individual control lines. For example, the HP59501 Power Supply Programmer and HP 59306A Relay Actuator were both relatively simple HP-IB peripherals implemented only in TTL, using no microprocessor, HP licensed the HP-IB patents for a nominal fee to other manufacturers. It became known as the General Purpose Interface Bus, and became a de facto standard for automated, as GPIB became popular, it was formalized by various standards organizations. In 1975, the IEEE standardized the bus as Standard Digital Interface for Programmable Instrumentation, IEEE488, the standard was revised in 1987, and redesignated as IEEE488.1. These standards formalized the mechanical, electrical, and basic protocol parameters of GPIB, in 1987, IEEE introduced Standard Codes, Formats, Protocols, and Common Commands, IEEE488.2. IEEE488.2 provided for basic syntax and format conventions, as well as device-independent commands, data structures, error protocols, and the like. IEEE488.2 built on IEEE488.1 without superseding it, while IEEE488.1 defined the hardware and IEEE488.2 defined the protocol, there was still no standard for instrument-specific commands. Commands to control the same class of instrument, e. g. multimeters, the United States Air Force, and later Hewlett-Packard, recognized this problem. In 1989, HP developed their TML language which was the forerunner to Standard Commands for Programmable Instrumentation, SCPI was introduced as an industry standard in 1990. SCPI added standard generic commands, and a series of instrument classes with corresponding class-specific commands, SCPI mandated the IEEE488.2 syntax, but allowed other physical transports. The IEC developed their own standards in parallel with the IEEE, with IEC 60625-1 and IEC 60625-2, national Instruments introduced a backward-compatible extension to IEEE488.1, originally known as HS-488. It increased the maximum rate to 8 Mbyte/s, although the rate decreases as more devices are connected to the bus. This was incorporated into the standard in 2003, over HPs objections. 1/IEC 60625-1, IEEE488 is an 8-bit, electrically parallel bus. The bus employs sixteen signal lines — eight used for data transfer. Every device on the bus has a unique 5-bit primary address, the standard allows up to 15 devices to share a single physical bus of up to 20 meters total cable length
12.
United Kingdom
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The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, the United Kingdom includes the island of Great Britain, Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state—the Republic of Ireland. The Irish Sea lies between Great Britain and Ireland, with an area of 242,500 square kilometres, the United Kingdom is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants, together, this makes it the fourth-most densely populated country in the European Union. The United Kingdom is a monarchy with a parliamentary system of governance. The monarch is Queen Elizabeth II, who has reigned since 6 February 1952, other major urban areas in the United Kingdom include the regions of Birmingham, Leeds, Glasgow, Liverpool and Manchester. The United Kingdom consists of four countries—England, Scotland, Wales, the last three have devolved administrations, each with varying powers, based in their capitals, Edinburgh, Cardiff and Belfast, respectively. The relationships among the countries of the UK have changed over time, Wales was annexed by the Kingdom of England under the Laws in Wales Acts 1535 and 1542. A treaty between England and Scotland resulted in 1707 in a unified Kingdom of Great Britain, which merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Five-sixths of Ireland seceded from the UK in 1922, leaving the present formulation of the United Kingdom of Great Britain, there are fourteen British Overseas Territories. These are the remnants of the British Empire which, at its height in the 1920s, British influence can be observed in the language, culture and legal systems of many of its former colonies. The United Kingdom is a country and has the worlds fifth-largest economy by nominal GDP. The UK is considered to have an economy and is categorised as very high in the Human Development Index. It was the worlds first industrialised country and the worlds foremost power during the 19th, the UK remains a great power with considerable economic, cultural, military, scientific and political influence internationally. It is a nuclear weapons state and its military expenditure ranks fourth or fifth in the world. The UK has been a permanent member of the United Nations Security Council since its first session in 1946 and it has been a leading member state of the EU and its predecessor, the European Economic Community, since 1973. However, on 23 June 2016, a referendum on the UKs membership of the EU resulted in a decision to leave. The Acts of Union 1800 united the Kingdom of Great Britain, Scotland, Wales and Northern Ireland have devolved self-government
13.
Health and Safety Executive
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The Health and Safety Executive is a non-departmental public body of the United Kingdom with its headquarters in Liverpool, England. It is the responsible for the encouragement, regulation and enforcement of workplace health, safety and welfare. Responsibility in Northern Ireland lies with the Health and Safety Executive for Northern Ireland, the HSE was created by the Health and Safety at Work etc. The HSE is sponsored by the Department for Work and Pensions, as part of its work HSE investigates industrial accidents, small and large, including major incidents such as the explosion and fire at Buncefield in 2005. Though it formerly reported to the Health and Safety Commission, on 1 April 2008, the Executives duties are to, Assist and encourage persons concerned with matters relevant to the operation of the objectives of the Health and Safety at Work etc. Make arrangements for and encourage research and publication, training and information in connection with its work. The Executive is further obliged to keep the Secretary of State informed of its plans and ensure alignment with the policies of the Secretary of State, the Secretary of State can give directions to the Executive. On 1 April 2006, the Executive ceased to have responsibility for railway safety, the Executive is responsible for the Employment Medical Advisory Service, which operates as part of its Field Operations Directorate. Local authorities are responsible for the enforcement of health and safety legislation in shops, offices and it was established in 1921 under the Safety in Mines Research Board to carry out large-scale tests related to mining hazards. In 1995 the HSL was formed, including the Buxton site, in 2004 the Sheffield activities moved to Buxton, and the University of Sheffield took over the Sheffield laboratory site. It now operates as an agency carrying out research and investigations for the HSE, other government agencies. HM Inspectorate of Mines is responsible for the implementation and inspection of safe working procedures within all UK mine workings. It is based in Sheffield, South Yorkshire, the Offshore Safety Division was established as a division within HSE in April 1991. This was in response to recommendations of the Cullen Inquiry into the Piper Alpha disaster on 6 July 1988, at the time of the disaster the Department of Energy was responsible for both production and offshore safety, this was perceived as entailing a conflict of interests. Dr Tony Barrell, Director of HSE’s Technology and Air Pollution Division was appointed Chief Executive of OSD, at the same time Ministerial oversight was transferred from the DEn to the Department of Employment. The Offshore Safety Act 1992 made the Mineral Workings Act 1971 and its subsidiary Regulations relevant statutory provisions of the Health and Safety at work etc, Act 1974. The OSD’s initial responsibilities included the establishment of the Safety Case Regulations, a review of existing safety legislation. OSD became part of the HSE’s new Hazardous Installations Directorate in 1999, the HSE currently administrates the Occupational Safety & Health Consultants Register, a central register of registered safety consultants within the United Kingdom and Northern Ireland
14.
Buckminster Fuller
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Richard Buckminster Bucky Fuller was an American architect, systems theorist, author, designer, and inventor. Fuller published more than 30 books, coining or popularizing terms such as Spaceship Earth, ephemeralization and he also developed numerous inventions, mainly architectural designs, and popularized the widely known geodesic dome. Carbon molecules known as fullerenes were later named by scientists for their structural and mathematical resemblance to geodesic spheres, Fuller was the second World President of Mensa from 1974 to 1983. Fuller was born on July 12,1895, in Milton, Massachusetts, the son of Richard Buckminster Fuller and Caroline Wolcott Andrews and he spent much of his youth on Bear Island, in Penobscot Bay off the coast of Maine. He often made items from materials he found in the woods and he experimented with designing a new apparatus for human propulsion of small boats. Later in life, Fuller took exception to the term invention, Fuller earned a machinists certification, and knew how to use the press brake, stretch press, and other tools and equipment used in the sheet metal trade. Fuller attended Milton Academy in Massachusetts, and after that studying at Harvard College. He was expelled from Harvard twice, first for spending all his money partying with a vaudeville troupe, by his own appraisal, he was a non-conforming misfit in the fraternity environment. Between his sessions at Harvard, Fuller worked in Canada as a mechanic in a textile mill, and later as a laborer in the meat-packing industry. He also served in the U. S. Navy in World War I, as a radio operator, as an editor of a publication. After discharge, he worked again in the packing industry. In 1917, he married Anne Hewlett, Buckminster Fuller recalled 1927 as a pivotal year of his life. His daughter Alexandra had died in 1922 of complications from polio, Fuller dwelled on her death, suspecting that it was connected with the Fullers damp and drafty living conditions. This provided motivation for Fullers involvement in Stockade Building Systems, a business which aimed to provide affordable, in 1927, at age 32, Fuller lost his job as president of Stockade. The Fuller family had no savings, and the birth of their daughter Allegra in 1927 added to the financial challenges, Fuller drank heavily and reflected upon the solution to his familys struggles on long walks around Chicago. During the autumn of 1927, Fuller contemplated suicide, so that his family could benefit from an insurance payment. Fuller said that he had experienced a profound incident which would provide direction and he felt as though he was suspended several feet above the ground enclosed in a white sphere of light. A voice spoke directly to Fuller, and declared, From now on you need never await temporal attestation to your thought and you do not have the right to eliminate yourself
15.
Emergent behavior
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Emergence is central in theories of integrative levels and of complex systems. For instance, the phenomenon of life as studied in biology is an emergent property of chemistry, in philosophy, theories that emphasize emergent properties have been called emergentism. Almost all accounts of emergentism include a form of epistemic or ontological irreducibility to the lower levels, in philosophy, emergence is often understood to be a claim about the etiology of a systems properties. An emergent property of a system, in context, is one that is not a property of any component of that system. Nicolai Hartmann, one of the first modern philosophers to write on emergence and this idea of emergence has been around since at least the time of Aristotle. John Stuart Mill and Julian Huxley are two of many scientists and philosophers who have written on the concept, further, every resultant is clearly traceable in its components, because these are homogeneous and commensurable. The emergent is unlike its components insofar as these are incommensurable, economist Jeffrey Goldstein provided a current definition of emergence in the journal Emergence. Goldstein initially defined emergence as, the arising of novel and coherent structures, patterns, Systems scientist Peter Corning also says that living systems cannot be reduced to underlying laws of physics, Rules, or laws, have no causal efficacy, they do not in fact “generate” anything. They serve merely to describe regularities and consistent relationships in nature and these patterns may be very illuminating and important, but the underlying causal agencies must be separately specified. But that aside, the game of chess illustrates, why any laws or rules of emergence and evolution are insufficient. Even in a game, you cannot use the rules to predict “history” – i. e. the course of any given game. Indeed, you cannot even reliably predict the move in a chess game. Because the “system” involves more than the rules of the game and it also includes the players and their unfolding, moment-by-moment decisions among a very large number of available options at each choice point. The game of chess is inescapably historical, even though it is constrained and shaped by a set of rules. Moreover, and this is a key point, the game of chess is also shaped by teleonomic, cybernetic and it is not simply a self-ordered process, it involves an organized, “purposeful” activity. Usage of the notion emergence may generally be subdivided into two perspectives, that of weak emergence and strong emergence, in terms of physical systems, weak emergence is a type of emergence in which the emergent property is amenable to computer simulation. This is opposed to the notion of strong emergence, in which the emergent property cannot be simulated by a computer. Some common points between the two notions are that emergence concerns new properties produced as the system grows, which is to say ones which are not shared with its components or prior states, also, it is assumed that the properties are supervenient rather than metaphysically primitive
16.
Biology
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Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, identification and taxonomy. Modern biology is a vast and eclectic field, composed of branches and subdisciplines. However, despite the broad scope of biology, there are certain unifying concepts within it that consolidate it into single, coherent field. In general, biology recognizes the cell as the unit of life, genes as the basic unit of heredity. It is also understood today that all organisms survive by consuming and transforming energy and by regulating their internal environment to maintain a stable, the term biology is derived from the Greek word βίος, bios, life and the suffix -λογία, -logia, study of. The Latin-language form of the term first appeared in 1736 when Swedish scientist Carl Linnaeus used biologi in his Bibliotheca botanica, the first German use, Biologie, was in a 1771 translation of Linnaeus work. In 1797, Theodor Georg August Roose used the term in the preface of a book, karl Friedrich Burdach used the term in 1800 in a more restricted sense of the study of human beings from a morphological, physiological and psychological perspective. The science that concerns itself with these objects we will indicate by the biology or the doctrine of life. Although modern biology is a recent development, sciences related to. Natural philosophy was studied as early as the ancient civilizations of Mesopotamia, Egypt, the Indian subcontinent, however, the origins of modern biology and its approach to the study of nature are most often traced back to ancient Greece. While the formal study of medicine back to Hippocrates, it was Aristotle who contributed most extensively to the development of biology. Especially important are his History of Animals and other works where he showed naturalist leanings, and later more empirical works that focused on biological causation and the diversity of life. Aristotles successor at the Lyceum, Theophrastus, wrote a series of books on botany that survived as the most important contribution of antiquity to the plant sciences, even into the Middle Ages. Scholars of the medieval Islamic world who wrote on biology included al-Jahiz, Al-Dīnawarī, who wrote on botany, biology began to quickly develop and grow with Anton van Leeuwenhoeks dramatic improvement of the microscope. It was then that scholars discovered spermatozoa, bacteria, infusoria, investigations by Jan Swammerdam led to new interest in entomology and helped to develop the basic techniques of microscopic dissection and staining. Advances in microscopy also had a impact on biological thinking. In the early 19th century, a number of biologists pointed to the importance of the cell. Thanks to the work of Robert Remak and Rudolf Virchow, however, meanwhile, taxonomy and classification became the focus of natural historians
17.
Host (biology)
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In biology, a host is an organism that harbors a parasitic, a mutual, or a commensal symbiont, typically providing nourishment and shelter. Examples include animals playing host to parasitic worms, cells harbouring a parasitic virus, more specifically in botany, a host plant supplies food resources and acts as a substrate for commensalist insects or other fauna. Guest is the term used for parasites, mutualists and commensals. The host range of a parasite is the collection of hosts that an organism can utilize as a partner, in the case of human parasites, the host range influences the epidemiology of the parasitism or disease. For instance, the production of antigenic shifts in Influenza A virus can result from pigs being infected with the virus from different hosts. This co-infection provides an opportunity for mixing of the viral genes between existing strains, thereby producing a new viral strain
18.
Organism
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In biology, an organism is any contiguous living system, such as an animal, plant, fungus, protist, archaeon, or bacterium. All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells, when it has one cell it is known as an organism. Most unicellular organisms are of microscopic scale and are thus described as microorganisms. Humans are multicellular organisms composed of trillions of cells grouped into specialized tissues. An organism may be either a prokaryote or a eukaryote, prokaryotes are represented by two separate domains—bacteria and archaea. Eukaryotic organisms are characterized by the presence of a cell nucleus. Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes, estimates on the number of Earths current species range from 10 million to 14 million, of which only about 1.2 million have been documented. More than 99% of all species, amounting to five billion species. In 2016, a set of 355 genes from the last universal ancestor of all living organisms living was identified. The term organism first appeared in the English language in 1703 and it is directly related to the term organization. There is a tradition of defining organisms as self-organizing beings. An organism may be defined as an assembly of molecules functioning as a more or less stable whole that exhibits the properties of life. Dictionary definitions can be broad, using such as any living structure, such as a plant, animal, fungus or bacterium, capable of growth. Many definitions exclude viruses and possible man-made non-organic life forms, as viruses are dependent on the machinery of a host cell for reproduction. A superorganism is an organism consisting of individuals working together as a single functional or social unit. There has been controversy about the best way to define the organism, several contributions are responses to the suggestion that the category of organism may well not be adequate in biology. Viruses are not typically considered to be organisms because they are incapable of autonomous reproduction and this controversy is problematic because some cellular organisms are also incapable of independent survival and live as obligatory intracellular parasites
19.
Parasitism
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In biology/ecology, parasitism is a non-mutual relationship between species, where one species, the parasite, benefits at the expense of the other, the host. Traditionally parasite referred primarily to organisms visible to the naked eye, Parasites can be microparasites, which are typically smaller, such as protozoa, viruses, and bacteria. Examples of parasites include the plants mistletoe and cuscuta, and animals such as hookworms, unlike predators, parasites typically do not kill their host, are generally much smaller than their host, and will often live in or on their host for an extended period. Both are special cases of consumer-resource interactions, Parasites show a high degree of specialization, and reproduce at a faster rate than their hosts. Classic examples of parasitism include interactions between vertebrate hosts and tapeworms, flukes, the Plasmodium species, and fleas, parasitism differs from the parasitoid relationship in that parasitoids generally kill their hosts. Parasites reduce host biological fitness by general or specialized pathology, such as parasitic castration and impairment of secondary sex characteristics, Parasites increase their own fitness by exploiting hosts for resources necessary for their survival, e. g. food, water, heat, habitat, and transmission. Although parasitism applies unambiguously to many cases, it is part of a continuum of types of interactions between species, rather than an exclusive category, in many cases, it is difficult to demonstrate harm to the host. In others, there may be no apparent specialization on the part of the parasite, coined in English in 1611, the word parasitism comes from the Greek παρά + σιτισμός feeding, fattening. Parasites are classified based on their interactions with their hosts and on their life cycles, an obligate parasite is totally dependent on the host to complete its life cycle, while a facultative parasite is not. A direct parasite has one host while an indirect parasite has multiple hosts. For indirect parasites, there always be a definitive host. Parasites that live on the outside of the host, either on the skin or the outgrowths of the skin, are called ectoparasites and those that live inside the host are called endoparasites. Endoparasites can exist in one of two forms, intercellular parasites or intracellular parasites, intracellular parasites, such as protozoa, bacteria or viruses, tend to rely on a third organism, which is generally known as the carrier or vector. The vector does the job of transmitting them to the host, an example of this interaction is the transmission of malaria, caused by a protozoan of the genus Plasmodium, to humans by the bite of an anopheline mosquito. Those parasites living in a position, being half-ectoparasites and half-endoparasites, are called mesoparasites. An epiparasite is one that feeds on another parasite and this relationship is also sometimes referred to as hyperparasitism, exemplified by a protozoan living in the digestive tract of a flea living on a dog. Social parasites take advantage of interactions between members of social organisms such as ants, termites, and bumblebees, an extreme example of social parasitism is the ant species of Tetramorium inquilinum of the Alps, which spend their whole lives on the back of Tetramorium host ants. With tiny and deprecated bodies they have evolved for one single task, if they fall off, they most likely would not have the strength to climb back on top of another ant, and eventually they will die
20.
Antibiotics
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Antibiotics, also called antibacterials, are a type of antimicrobial drug used in the treatment and prevention of bacterial infections. They may either kill or inhibit the growth of bacteria, a limited number of antibiotics also possess antiprotozoal activity. Antibiotics are not effective against viruses such as the cold or influenza. Drugs which inhibit viruses are termed antiviral drugs or antivirals rather than antibiotics, sometimes the term antibiotic is used to refer to any substance used against microbes, synonymous with antimicrobial. Some sources distinguish between antibacterial and antibiotic, antibacterials are used in soaps and disinfectants, while antibiotics are used as medicine, Antibiotics revolutionized medicine in the 20th century, and have together with vaccination led to the near eradication of diseases such as tuberculosis in the developed world. However, their effectiveness and easy access led to overuse, especially in raising, prompting bacteria to develop resistance. All classes of antibiotics in use today were first discovered prior to the mid 1980s, substances with antibiotic properties had been used for various purposes since ancient times. Before the early 20th century, treatments for infections were based primarily on medicinal folklore, mixtures with antimicrobial properties that were used in treatments of infections were described over 2000 years ago. Many ancient cultures, including the ancient Egyptians and ancient Greeks, used specially selected mold and plant materials, more recent observations made in the laboratory of antibiosis between microorganisms led to the discovery of natural antibacterials produced by microorganisms. Louis Pasteur observed, if we could intervene in the antagonism observed between some bacteria, it would offer perhaps the greatest hopes for therapeutics. In 1874, physician Sir William Roberts noted that cultures of the mold Penicillium glaucum that is used in the making of types of blue cheese did not display bacterial contamination. In 1876, physicist John Tyndall also contributed to this field, Louis Pasteur conducted research showing that Bacillus anthracis would not grow in the presence of the related mold Penicillium notatum. In his thesis, Duchesne proposed that bacteria and molds engage in a battle for survival. Duchesne observed that E. coli was eliminated by the fungus Penicillium glaucum when they were grown in the same culture. He also observed that when he inoculated animals with lethal doses of typhoid bacilli together with Penicillium glaucum. Unfortunately Duchesnes army service after getting his degree prevented him from doing any further research, Duchesne died of tuberculosis, a disease now treated by antibiotics. In 1928, Sir Alexander Fleming identified penicillin, a molecule produced by molds that kills or stops the growth of certain kinds of bacteria. Fleming was working on a culture of disease-causing bacteria when he noticed the spores of a mold, Penicillium chrysogenum
21.
Penicillin
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Penicillin is a group of antibiotics which include penicillin G, penicillin V, procaine penicillin, and benzathine penicillin. Penicillin antibiotics were among the first medications to be effective against many bacterial infections caused by staphylococci and streptococci, penicillins are still widely used today, though many types of bacteria have developed resistance following extensive use. About 10% of people report that they are allergic to penicillin, however, serious allergies only occur in about 0. 03%. Penicillin was discovered in 1928 by Scottish scientist Alexander Fleming, people began using it to treat infections in 1942. There are several enhanced penicillin families which are effective against additional bacteria, these include the penicillins, aminopenicillins. They are derived from Penicillium fungi, the term penicillin is often used generically to refer to benzylpenicillin, procaine benzylpenicillin, benzathine benzylpenicillin, and phenoxymethylpenicillin. Procaine penicillin and benzathine penicillin have the same activity as benzylpenicillin. Phenoxymethylpenicillin is less active against gram-negative bacteria than benzylpenicillin, infrequent adverse effects include fever, vomiting, erythema, dermatitis, angioedema, seizures, and pseudomembranous colitis. About 10% of people report that they are allergic to penicillin, however, serious allergies only occur in about 0. 03%. Penicillin can also induce serum sickness or a serum sickness-like reaction in some individuals, serum sickness is a type III hypersensitivity reaction that occurs one to three weeks after exposure to drugs including penicillin. It is not a drug allergy, because allergies are type I hypersensitivity reactions. Pain and inflammation at the site is also common for parenterally administered benzathine benzylpenicillin, benzylpenicillin. Significantly, there is a reaction to Streptolysin S, a toxin released by certain killed bacteria and associated with Penicillin injection. Allergic reactions to any β-lactam antibiotic may occur in up to 1% of patients receiving that agent, the allergic reaction is a Type I hypersensitivity reaction. Anaphylaxis will occur in approximately 0. 01% of patients and it has previously been accepted that there was up to a 10% cross-sensitivity between penicillin-derivatives, cephalosporins, and carbapenems, due to the sharing of the β-lactam ring. Assessments in 2006 found no risk for cross-allergy for second-generation or later cephalosporins than the first generation. However, as a risk, research shows that all beta lactams have the intrinsic hazard of very serious hazardous reactions in susceptible patients. Only the frequency of these reactions vary, based on the structure, bacteria constantly remodel their peptidoglycan cell walls, simultaneously building and breaking down portions of the cell wall as they grow and divide
22.
Aminoglycoside
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Other examples include the deoxystreptamine-containing agents kanamycin, tobramycin, gentamicin, and neomycin. Aminoglycosides that are derived from bacteria of the Streptomyces genus are named with the suffix mycin, however, this nomenclature system is not specific for aminoglycosides, and so appearance of this set of suffixes does not imply common mechanism of action. They require only short time, and are most effective against susceptible bacterial populations that are rapidly multiplying. The inhibition of protein synthesis is mediated through aminoglycosides energy-dependent, sometimes irreversible binding, to the cytosolic, specifically, binding impairs translational proofreading leading to misreading of the RNA message, premature termination, or both, and so to inaccuracy of the translated protein product. The subset of aberrant proteins that are incorporated into the cell membrane may then lead to changes in its permeability. The amino-sugar portion of class of molecules are implicated in the association of the small molecule with ribosomal structures that lead to the infidelities in translation. Movement of the peptidyl-tRNA from the A- to the P-site—has also been suggested, there is a significant variability in the relationship between the dose administered and the resultant plasma level in blood. Therapeutic drug monitoring is necessary to obtain the correct dose and these agents exhibit a post-antibiotic effect in which there is no or very little drug level detectable in blood, but there still seems to be inhibition of bacterial re-growth. This is due to strong, irreversible binding to the ribosome, and remains long after plasma levels drop. Depending on their concentration, they act as bacteriostatic or bactericidal agents, Aminoglycosides are useful primarily in infections involving aerobic, Gram-negative bacteria, such as Pseudomonas, Acinetobacter, and Enterobacter. In addition, some Mycobacteria, including the bacteria that cause tuberculosis, are susceptible to aminoglycosides, usually, once cultures of the causal organism are grown and their susceptibilities tested, aminoglycosides are discontinued in favor of less toxic antibiotics. As noted, aminoglycosides are mostly ineffective against anaerobic bacteria, fungi, infections caused by Gram-positive bacteria can also be treated with aminoglycosides, but other types of antibiotics are more potent and less damaging to the host. In the past, the aminoglycosides have been used in conjunction with antibiotics in streptococcal infections for their synergistic effects. One of the most frequent combinations is ampicillin and gentamicin, often, hospital staff refer to this combination as amp and gent or more recently called pen and gent for penicillin and gentamicin. The interference with DNA proofreading has been exploited to treat diseases that result from premature stop codons. Aminoglycosides can cause the cell to overcome the stop codons, insert a random amino acid, the aminoglycoside gentamicin has been used to treat cystic fibrosis cells in the laboratory to induce them to grow full-length proteins. CF is caused by a mutation in the coding for the cystic fibrosis transmembrane conductance regulator protein. In approximately 10% of CF cases, the mutation in this gene causes its early termination during translation, leading to the formation of is truncated, since they are not absorbed from the gut, they are administered intravenously and intramuscularly
23.
Bacteria
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Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods, Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, Bacteria also live in symbiotic and parasitic relationships with plants and animals. Most bacteria have not been characterised, and only half of the bacterial phyla have species that can be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology, There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water. There are approximately 5×1030 bacteria on Earth, forming a biomass which exceeds that of all plants, Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of bodies and bacteria are responsible for the putrefaction stage in this process. In March 2013, data reported by researchers in October 2012, was published and it was suggested that bacteria thrive in the Mariana Trench, which with a depth of up to 11 kilometres is the deepest known part of the oceans. Other researchers reported related studies that microbes thrive inside rocks up to 580 metres below the sea floor under 2.6 kilometres of ocean off the coast of the northwestern United States. According to one of the researchers, You can find microbes everywhere—theyre extremely adaptable to conditions, the vast majority of the bacteria in the body are rendered harmless by the protective effects of the immune system, though many are beneficial particularly in the gut flora. However several species of bacteria are pathogenic and cause diseases, including cholera, syphilis, anthrax, leprosy. The most common fatal diseases are respiratory infections, with tuberculosis alone killing about 2 million people per year. In developed countries, antibiotics are used to treat infections and are also used in farming, making antibiotic resistance a growing problem. Once regarded as constituting the class Schizomycetes, bacteria are now classified as prokaryotes. Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and these evolutionary domains are called Bacteria and Archaea. The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, for about 3 billion years, most organisms were microscopic, and bacteria and archaea were the dominant forms of life. In 2008, fossils of macroorganisms were discovered and named as the Francevillian biota, however, gene sequences can be used to reconstruct the bacterial phylogeny, and these studies indicate that bacteria diverged first from the archaeal/eukaryotic lineage. Bacteria were also involved in the second great evolutionary divergence, that of the archaea, here, eukaryotes resulted from the entering of ancient bacteria into endosymbiotic associations with the ancestors of eukaryotic cells, which were themselves possibly related to the Archaea
24.
Type I topoisomerase
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In molecular biology Type I topoisomerases are enzymes that cut one of the two strands of double-stranded DNA, relax the strand, and reanneal the strand. They are further subdivided into two structurally and mechanistically distinct topoisomerases, type IA and type IB, Type IA topoisomerases change the linking number of a circular DNA strand by units of strictly 1. Type IB topoisomerases change the number by multiples of 1. Historically, type IA topoisomerases are referred to as prokaryotic topo I and this distinction, however, no longer applies as type IA and type IB topoisomerases exist in all domains of life. Functionally, these subclasses perform very specialized functions and this domain assumes a beta-alpha-beta-alpha-beta fold, with a left-handed crossover between strands beta2 and beta3. These enzymes are responsible for relaxing positively and/or negatively supercoiled DNA, except for reverse gyrase. DNA topoisomerases are divided into two classes, type I enzymes break single-strand DNA, and type II enzymes break double-strand DNA, Type IA topoisomerases, historically said to be found in prokaryotes, create a single break in DNA and pass a second strand or duplex through the break. This strand passage mechanism shares several features with type IIA topoisomerases and they both form a 5 phosphotyrosine intermediate, and require a divalent metal ion to perform its work. Unlike type II topoisomerases, type IA topoisomerases do not use energy to do its work, Type IA topoisomerases have several domains, often number Domain 1-4. Domain I contains a Toprim domain, domain IV and domain III each consist of a helix-turn-helix domain, Domain II is a flexible bridge between domains III and IV. The structure of type IA topoisomerase resembles a lock, with Domains I, III, the structure of topo III bound to single-stranded DNA shows how the HTH and Toprim domain are coordinated about the DNA. There are several variants of Type IA topoisomerases, differing by appendages attached to the main core, members of this subclass include topo I, topo III, and reverse gyrase. Reverse gyrase is particularly interesting because an ATPase domain, which resembles the domain of the Rho transcription factor, is attached. The enzyme uses the hydrolysis of ATP to introduce positive supercoils and overwinds DNA, rodriguez and Stock have done further work to identify a latch that is involved in communicating the hydroylsis of ATP to the introduction of positive supercoils. The topo III variant is very interesting because it has zinc-binding motifs that is thought to bind single-stranded DNA. Topo III has been identified to be associated with the BLM helicase during recombination, Type IA topoisomerases operate through a strand-passage mechanism, using a single gate. First, the single-stranded DNA binds domain III and I, the catalytic tyrosine cleaves the DNA backbone, creating a transient 5 phosphotyrosine intermediate. The break is then separated, using domain II as a hinge, Domain III and I close and the DNA is re-annealed
25.
United States Environmental Protection Agency
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The EPA was proposed by President Richard Nixon and began operation on December 2,1970, after Nixon signed an executive order. The order establishing the EPA was ratified by committee hearings in the House, the agency is led by its Administrator, who is appointed by the president and approved by Congress. The current administrator is Scott Pruitt, the EPA is not a Cabinet department, but the administrator is normally given cabinet rank. The EPA has its headquarters in Washington, D. C. regional offices for each of the ten regions. The agency conducts environmental assessment, research, and education and it has the responsibility of maintaining and enforcing national standards under a variety of environmental laws, in consultation with state, tribal, and local governments. It delegates some permitting, monitoring, and enforcement responsibility to U. S. states, EPA enforcement powers include fines, sanctions, and other measures. The agency also works with industries and all levels of government in a variety of voluntary pollution prevention programs. In 2016, the agency had 15,376 full-time employees, more than half of EPAs employees are engineers, scientists, and environmental protection specialists, other employees include legal, public affairs, financial, and information technologists. Beginning in the late 1950s and through the 1960s, Congress reacted to increasing concern about the impact that human activity could have on the environment. Senator James E. Murray introduced a bill, the Resources and Conservation Act of 1959, the 1962 publication of Silent Spring by Rachel Carson alerted the public about the detrimental effects on the environment of the indiscriminate use of pesticides. In the years following, similar bills were introduced and hearings were held to discuss the state of the environment, in the colloquium, some members of Congress expressed a continuing concern over federal agency actions affecting the environment. The National Environmental Policy Act of 1969 was modeled on RCA, President Nixon signed NEPA into law on January 1,1970. The law created the Council on Environmental Quality in the Executive Office of the President, NEPA required that a detailed statement of environmental impacts be prepared for all major federal actions significantly affecting the environment. The detailed statement would ultimately be referred to as an impact statement. On July 9,1970, Nixon proposed a reorganization that consolidated many environmental responsibilities of the federal government under one agency. After conducting hearings during that summer, the House and Senate approved the proposal, the agency’s first administrator, William Ruckelshaus, took the oath of office on December 4,1970. In May 2013, Congress renamed the EPA headquarters as the William Jefferson Clinton Federal Building, the EPA is led by an Administrator of the Environmental Protection Agency. As of 2017 Scott Pruitt is the 14th administrator, each EPA regional office is responsible within its states for implementing the Agencys programs, except those programs that have been specifically delegated to states
26.
Pesticide
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Pesticides are substances that are meant to control pests or weeds. The most common of these are herbicides which account for approximately 80% of all pesticide use, most pesticides are intended to serve as plant protection products, which in general, protect plants from weeds, fungi, or insects. In general, a pesticide is a chemical or biological agent that deters, incapacitates, kills, or otherwise discourages pests. Target pests can include insects, plant pathogens, weeds, mollusks, birds, mammals, fish, nematodes, although pesticides have benefits, some also have drawbacks, such as potential toxicity to humans and other species. According to the Stockholm Convention on Persistent Organic Pollutants,9 of the 12 most dangerous, the term includes substances intended for use as a plant growth regulator, defoliant, desiccant, or agent for thinning fruit or preventing the premature fall of fruit. Also used as substances applied to either before or after harvest to protect the commodity from deterioration during storage. Pesticides can be classified by target organism, chemical structure, biopesticides include microbial pesticides and biochemical pesticides. Plant-derived pesticides, or botanicals, have been developing quickly and these include the pyrethroids, rotenoids, nicotinoids, and a fourth group that includes strychnine and scilliroside. Many pesticides can be grouped into chemical families, prominent insecticide families include organochlorines, organophosphates, and carbamates. Organochlorine hydrocarbons could be separated into dichlorodiphenylethanes, cyclodiene compounds, and they operate by disrupting the sodium/potassium balance of the nerve fiber, forcing the nerve to transmit continuously. Their toxicities vary greatly, but they have phased out because of their persistence. Organophosphate and carbamates largely replaced organochlorines, both operate through inhibiting the enzyme acetylcholinesterase, allowing acetylcholine to transfer nerve impulses indefinitely and causing a variety of symptoms such as weakness or paralysis. Organophosphates are quite toxic to vertebrates, and have in some cases replaced by less toxic carbamates. Thiocarbamate and dithiocarbamates are subclasses of carbamates, prominent families of herbicides include phenoxy and benzoic acid herbicides, triazines, ureas, and Chloroacetanilides. Phenoxy compounds tend to selectively kill broad-leaf weeds rather than grasses, the phenoxy and benzoic acid herbicides function similar to plant growth hormones, and grow cells without normal cell division, crushing the plants nutrient transport system. Many commonly used pesticides are not included in these families, including glyphosate, Pesticides can be classified based upon their biological mechanism function or application method. Most pesticides work by poisoning pests, a systemic pesticide moves inside a plant following absorption by the plant. With insecticides and most fungicides, this movement is usually upward and outward, increased efficiency may be a result
27.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
28.
Piperonyl butoxide
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Piperonyl butoxide is an organic compound used as a component of pesticide formulations. It is a white solid. That is, despite having no activity of its own, it enhances the potency of certain pesticides such as carbamates, pyrethrins, pyrethroids. It is a derivative of safrole. PBO was developed in the late 1930s and early 1940s to enhance the performance of the naturally derived insecticide pyrethrum, pyrethrum is and was an important insecticide against mosquitoes and other disease-carrying vectors, thereby providing public health benefits, e. g. preventing malaria. Although exhibiting little intrinsic insecticidal activity of its own, PBO increases the effectiveness of pyrethrins, PBO was first patented in 1947 in the US by Herman Wachs. PBO was first registered in the United States in the 1950s, PBO is mainly used in combination with insecticides, such as natural pyrethrins or synthetic pyrethroids, in ratios ranging from 3,1 to 20,1. Appearing in over 1,500 United States EPA-registered products, PBO is one of the most commonly registered synergists as measured by the number of formulas in which it is present. It is approved for pre- and postharvest application to a variety of crops and commodities, including grain, fruits. The application rates are low, the highest single rate is 0.5 lbs PBO/acre, a wide variety of water-based PBO-containing products such as crack and crevice sprays, total release foggers, and flying insect sprays are produced for and sold to consumers for home use. PBO has an important public role as a synergist used in pyrethrins. Because of its limited, if any, insecticidal properties, PBO is never used alone, an important consequence of this property is that, by enhancing the activity of a given insecticide, less may be used to achieve the same result. PBO does not appear to have a significant effect on the MFO system in humans, PBO is found to be an efficacious, low-potency, neutral antagonist of G-protein-coupled CB1 receptors. Other synergists for pyrethroid insecticides include Sesamex and Sulfoxide, PBO is regulated in the United States and some other countries as a pesticide, even though PBO does not have this property. Pesticide registration is the process through which United States EPA examines the ingredients of a pesticide, where and how the pesticide is used, United States EPA also evaluates the pesticide to ensure that it will not have unreasonable adverse effects on humans, the environment and non-target species. The World Health Organization recognizes the health value of PBO when used in conjunction with synthetic the pyrethroids deltamethrin or permethrin used in mosquito nets. Numerous toxicology studies have been conducted over the past 40 years on PBO examining the full range of toxic effects. These studies were conducted in accord with regulatory requirements put forth by the United States EPA or other international agencies, the following types of studies have been conducted in support of PBO registration, Acute toxicity studies are designed to identify potential hazards from acute exposures
29.
Apple
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The apple tree is a deciduous tree in the rose family best known for its sweet, pomaceous fruit, the apple. It is cultivated worldwide as a tree, and is the most widely grown species in the genus Malus. The tree originated in Central Asia, where its wild ancestor, Apples have been grown for thousands of years in Asia and Europe, and were brought to North America by European colonists. Apples have religious and mythological significance in many cultures, including Norse, Greek, Apple trees are large if grown from seed. Generally apple cultivars are propagated by grafting onto rootstocks, which control the size of the resulting tree, There are more than 7,500 known cultivars of apples, resulting in a range of desired characteristics. Different cultivars are bred for various tastes and uses, including cooking, eating raw, trees and fruit are prone to a number of fungal, bacterial and pest problems, which can be controlled by a number of organic and non-organic means. In 2010, the genome was sequenced as part of research on disease control. Worldwide production of apples in 2014 was 84.6 million tonnes, the apple is a deciduous tree, generally standing 1.8 to 4.6 m tall in cultivation and up to 12 m in the wild. When cultivated, the size, shape and branch density are determined by rootstock selection, the leaves are alternately arranged dark green-colored simple ovals with serrated margins and slightly downy undersides. Blossoms are produced in spring simultaneously with the budding of the leaves, the 3 to 4 cm flowers are white with a pink tinge that gradually fades, five petaled, with an inflorescence consisting of a cyme with 4–6 flowers. The central flower of the inflorescence is called the king bloom, it opens first, the fruit matures in late summer or autumn, and cultivars exist with a wide range of sizes. Commercial growers aim to produce an apple that is 7.0 to 8.3 cm in diameter, due to market preference. Some consumers, especially those in Japan, prefer a larger apple, while apples below 5.7 cm are generally used for making juice and have little market value. The skin of ripe apples is generally red, yellow, green, pink, the skin may also be wholly or partly russeted i. e. rough and brown. The skin is covered in a layer of epicuticular wax. The exocarp is generally pale yellowish-white, though pink or yellow also occur. The original wild ancestor of Malus pumila was Malus sieversii, found growing wild in the mountains of Central Asia in southern Kazakhstan, Kyrgyzstan, Tajikistan, in strains without recent admixture the contribution of the latter predominates. It had about 57,000 genes, the highest number of any plant genome studied to date and this new understanding of the apple genome will help scientists in identifying genes and gene variants that contribute to resistance to disease and drought, and other desirable characteristics
30.
Tree
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In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. Trees are not a group but include a variety of plant species that have independently evolved a woody trunk. In looser senses, the palms, the tree ferns, bananas. Trees tend to be long-lived, some reaching several thousand years old, the tallest known tree, a coast redwood named Hyperion, stands 115.6 m high. Trees have been in existence for 370 million years and it is estimated that there are just over 3 trillion mature trees in the world. A tree typically has many secondary branches supported clear of the ground by the trunk and this trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier, below the ground, the roots branch and spread out widely, they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the divide into smaller branches and shoots. The shoots typically bear leaves, which light energy and convert it into sugars by photosynthesis, providing the food for the trees growth. Flowers and fruit may also be present, but some trees, such as conifers, instead have pollen cones and seed cones, others, such as tree ferns, trees play a significant role in reducing erosion and moderating the climate. They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues, trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are one of the most biodiverse habitats in the world, trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In parts of the world, forests are shrinking as trees are cleared to increase the amount of available for agriculture. Because of their longevity and usefulness, trees have always revered, with sacred groves in various cultures. Although tree is a term of common parlance, there is no universally recognised precise definition of what a tree is, either botanically or in common language. In its broadest sense, a tree is any plant with the form of an elongated stem, or trunk. Trees are also defined by height, with smaller plants from 0.5 to 10 m being called shrubs
31.
Teacher
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A teacher is a person who helps others to acquire knowledge, competences or values. Informally the role of teacher may be taken on by anyone, in some countries, teaching young people of school age may be carried out in an informal setting, such as within the family, rather than in a formal setting such as a school or college. Some other professions may involve a significant amount of teaching, in most countries, formal teaching is usually carried out by paid professional teachers. This article focuses on those who are employed, as their role, to teach others in a formal education context. A teachers role may vary among cultures, Teachers may provide instruction in literacy and numeracy, craftsmanship or vocational training, the arts, religion, civics, community roles, or life skills. Formal teaching tasks include preparing lessons according to agreed curricula, giving lessons, a teachers professional duties may extend beyond formal teaching. In some education systems, teachers may have responsibility for student discipline, Teaching is a highly complex activity. This is in part because teaching is a practice, that takes place in a specific context. Factors that influence what is expected of teachers include history and tradition, social views about the purpose of education, so the competences required by a teacher are affected by the different ways in which the role is understood around the world. Broadly, there seem to be four models, the teacher as manager of instruction, the teacher as caring person, the teacher as expert learner, some evidence-based international discussions have tried to reach such a common understanding. Scholarly consensus is emerging that what is required of teachers can be grouped under three headings, knowledge craft skills and dispositions and it has been found that teachers who showed enthusiasm towards the course materials and students can create a positive learning experience. These teachers do not teach by rote but attempt to find new invigoration for the materials on a daily basis. One of the challenges facing teachers is that they may have covered a curriculum until they begin to feel bored with the subject. Students who had enthusiastic teachers tend to rate them higher than teachers who didnt show much enthusiasm for the course materials, Teachers that exhibit enthusiasm can lead to students who are more likely to be engaged, interested, energetic, and curious about learning the subject matter. Recent research has found a correlation between teacher enthusiasm and students intrinsic motivation to learn and vitality in the classroom, students who experienced a very enthusiastic teacher were more likely to read lecture material outside of the classroom. There are various mechanisms by which teacher enthusiasm may facilitate higher levels of intrinsic motivation, teacher enthusiasm may contribute to a classroom atmosphere of energy and enthusiasm which feeds student interest and excitement in learning the subject matter. Enthusiastic teachers may also lead to becoming more self-determined in their own learning process. The concept of mere exposure indicates that the teachers enthusiasm may contribute to the expectations about intrinsic motivation in the context of learning
32.
Essay
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An essay is, generally, a piece of writing that gives the authors own argument — but the definition is vague, overlapping with those of an article, a pamphlet, and a short story. Essays have traditionally been sub-classified as formal and informal, Essays are commonly used as literary criticism, political manifestos, learned arguments, observations of daily life, recollections, and reflections of the author. Almost all modern essays are written in prose, but works in verse have been dubbed essays, while brevity usually defines an essay, voluminous works like John Lockes An Essay Concerning Human Understanding and Thomas Malthuss An Essay on the Principle of Population are counterexamples. In some countries, essays have become a part of formal education. The concept of an essay has been extended to other mediums beyond writing, a film essay is a movie that often incorporates documentary filmmaking styles, and focuses more on the evolution of a theme or idea. A photographic essay covers a topic with a series of photographs that may have accompanying text or captions. An essay has been defined in a variety of ways, one definition is a prose composition with a focused subject of discussion or a long, systematic discourse. It is difficult to define the genre into which essays fall, aldous Huxley, a leading essayist, gives guidance on the subject. He notes that the essay is a device for saying almost everything about almost anything, and adds that by tradition, almost by definition. Furthermore, Huxley argues that essays belong to a species whose extreme variability can be studied most effectively within a three-poled frame of reference. Their art consists of setting forth, passing judgment upon, the abstract-universal, In this pole we find those essayists who do their work in the world of high abstractions, who are never personal and who seldom mention the particular facts of experience. Huxley adds that the most satisfying essays. make the best not of one, the word essay derives from the French infinitive essayer, to try or to attempt. In English essay first meant a trial or an attempt, for the rest of his life, he continued revising previously published essays and composing new ones. Francis Bacons essays, published in form in 1597,1612. Ben Jonson first used the word essayist in English in 1609, English essayists included Robert Burton and Sir Thomas Browne. In France, Michel de Montaignes three volume Essais in the mid 1500s contain over 100 examples widely regarded as the predecessor of the modern essay, in Italy, Baldassare Castiglione wrote about courtly manners in his essay Il Libro del oregano. In the 17th century, the Jesuit Baltasar Gracián wrote about the theme of wisdom, in the 18th and 19th centuries, Edmund Burke and Samuel Taylor Coleridge wrote essays for the general public. In the 20th century, a number of essayists tried to explain the new movements in art, whereas some essayists used essays for strident political themes, Robert Louis Stevenson and Willa Cather wrote lighter essays
33.
Drummer
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The term percussionist applies to a musician who performs struck musical instruments of numerous diverse shapes, sizes and applications. Most contemporary western ensembles bands for rock, pop, jazz, most drummers of this particular designation work within the context of a larger contingent that may also include, keyboard or guitar, auxiliary percussion and bass. Said ensembles may also include melodic based mallet percussion including, vibraphone, the rhythm section, being the core metronomic foundation with which other melodic instruments, including voices, may present the harmonic/melodic portion of the material. In popular music, the function of the drummer is to keep time or provide a steady tempo. There are many tools that a drummer can use for either timekeeping or soloing and these include cymbals, snare, toms, auxiliary percussion and many others. Also there are single, double, and triple bass pedals for the bass drum, before motorized transport became widespread, drummers played a key role in military conflicts. Military drummers provided drum cadences that set a marching pace. In some armies drums also assisted in combat by keeping cadence for firing and loading drills with muzzle loading guns, military drummers were also employed on the parade field, when troops passed in review, and in various ceremonies including ominous drum rolls accompanying disciplinary punishments. Children also served as drummer boys well into the century, though less commonly than is popularly assumed, due to the nature of the job. In modern times, drummers are not employed in battle, typically buglers and drummers mass under a sergeant-drummer and during marches alternately perform with the regiment or battalion ensembles. Military-based musical percussion traditions were not limited exclusively to the western world, in the Ottoman Empire, the size of a military band reflected the rank of its commander in chief, the largest band was reserved for the Sultan. It included various percussion instruments, often adopted in European military music, the pitched bass drum is still known in some languages as the Turkish Drum. The drumline is a type of marching ensemble descended from drummers, and can be arranged as a performance of a drum. Their uniforms will often have a style and a fancy hat. In recent times, it is common to see drummers in parades wearing costumes with an African, Asian, Latin, Native American, or tribal look. Various indigenous cultures use the drum to create a sense of unity with others especially during recreational events, the drum also helps in prayers and meditations. List of drummers Drum beat Drum machine Drum tracks Pipe band This article incorporates text from a now in the public domain, Chisholm, Hugh
34.
Rhythm
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Rhythm generally means a movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions. In the performance arts, rhythm is the timing of events on a scale, of musical sounds and silences that occur over time, of the steps of a dance, or the meter of spoken language. In some performing arts, such as hip hop music, the delivery of the lyrics is one of the most important elements of the style. Rhythm may also refer to visual presentation, as timed movement through space, in recent years, rhythm and meter have become an important area of research among music scholars. Recent work in these areas includes books by Maury Yeston, Fred Lerdahl and Ray Jackendoff, Jonathan Kramer, Christopher Hasty, Godfried Toussaint, William Rothstein, and Joel Lester. In Thinking and Destiny, Harold W. Percival defined rhythm as the character and meaning of thought expressed through the measure or movement in sound or form, or by written signs or words. In his television series How Music Works, Howard Goodall presents theories that human rhythm recalls the regularity with which we walk, other research suggests that it does not relate to the heartbeat directly, but rather the speed of emotional affect, which also influences heartbeat. Yet other researchers suggest that certain features of human music are widespread. The perception and abstraction of rhythmic measure is the foundation of human instinctive musical participation, Joseph Jordania recently suggested that the sense of rhythm was developed in the early stages of hominid evolution by the forces of natural selection. Plenty of animals walk rhythmically and hear the sounds of the heartbeat in the womb, some types of parrots can know rhythm. There is not a report of an animal being trained to tap, peck. For this reason, the fast-transient sounds of percussion instruments lend themselves to the definition of rhythm, Musical cultures that rely upon such instruments may develop multi-layered polyrhythm and simultaneous rhythms in more than one time signature, called polymeter. Such are the cross-rhythms of Sub-Saharan Africa and the interlocking kotekan rhythms of the gamelan, for information on rhythm in Indian music see Tala. For other Asian approaches to rhythm see Rhythm in Persian music, Rhythm in Arabian music and Usul—Rhythm in Turkish music and this consists of a series of identical yet distinct periodic short-duration stimuli perceived as points in time. It is currently most often designated as a crotchet or quarter note in western notation, faster levels are division levels, and slower levels are multiple levels. Rhythms of recurrence arise from the interaction of two levels of motion, the faster providing the pulse and the slower organizing the beats into repetitive groups. Once a metric hierarchy has been established, we, as listeners, a durational pattern that synchronises with a pulse or pulses on the underlying metric level may be called a rhythmic unit. A rhythmic gesture is any pattern that, in contrast to the rhythmic unit
Quotations related to synergy at Wikiquote