1.
Bristol Zoo
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Bristol Zoo is a zoo in the city of Bristol in South West England. Among species now on view at Bristol which are rare or absent in other UK zoos are Livingstones fruit bats and successful breeding groups of western lowland gorillas, the lakes islands are home to gorillas, tamarins, marmosets, gibbons and pelicans. Seal and Penguin Coasts is an attraction at the zoo, opened in 1999, it allows South American fur seals. The two pools contain 145,000 imperial gallons of water, with waves, waterfalls, rocks. The exhibit has a net over the top to allow Inca terns. Explorers Creek opened in May 2009 and features three areas – a water area, a tropical bird house and a walk-through lorikeet feeding area. Gorilla Island is home to a family of western lowland gorillas, as well as an indoor house which is also home to okapis, they have a large island which they share with the De Brazzas monkeys from Monkey Jungle. The gorillas are herbivores, and are not aggressive, however the keepers do not enter their island home because it is the zoos policy to keep the animals captive environment as similar as possible to that of their natural African forest habitat. The Terrace is one of the oldest parts of the zoo, by exchanging night and day, the animals can be observed during daylight hours. The lights allow a transition from night to day and vice versa. Twilight world is split into four zones, the Desert, the Rainforest, the Cave, the Reptile House houses a collection of reptiles and amphibians. The house itself is heated and gives a sense of the heat of the rainforest, there are three sections to the house, Desert, Rainforest and the Rearing Room where visitors can view the raising of reptiles and amphibian and also learn about the zoos conservation work. Outside, but still considered part of the house, is a giant tortoise and rhinoceros iguana enclosure where the animals have access to a heated indoor house. The Aquarium has around 70 species of fish, the aquarium has three sections, The Amazon River, Africa and the coral reef. On the outside of the building there is a water sculpture, there are several exhibits of conservation significance on view. Notably, there is a display of endangered cichlids from Lake Barombi Mbo in Cameroon, bug World, the zoos collection of invertebrates, includes species such as Partula snails, stick and leaf insects, corals and peacock mantis shrimp. Other displays include tarantulas, black widow spiders, giant millipedes, honey bees, leaf-cutting ants, zona Brazil includes a tropical house that has Amazon tree boas and tarantulas. The two monkey enclosures house Geoffreys marmosets, black lion tamarins and titi monkeys, outside, there are aviaries for red-tailed amazon parrots, an enclosure for golden lion tamarins and three linked paddocks for tapirs and capybaras
2.
Scientific method
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The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning, experiments need to be designed to test hypotheses. The most important part of the method is the experiment. The scientific method is a process, which usually begins with observations about the natural world. Human beings are naturally inquisitive, so often come up with questions about things they see or hear. The best hypotheses lead to predictions that can be tested in various ways, in general, the strongest tests of hypotheses come from carefully controlled and replicated experiments that gather empirical data. Depending on how well the tests match the predictions, the hypothesis may require refinement. If a particular hypothesis becomes very well supported a theory may be developed. Although procedures vary from one field of inquiry to another, identifiable features are shared in common between them. The overall process of the method involves making conjectures, deriving predictions from them as logical consequences. A hypothesis is a conjecture, based on knowledge obtained while formulating the question, the hypothesis might be very specific or it might be broad. Scientists then test hypotheses by conducting experiments, the purpose of an experiment is to determine whether observations agree with or conflict with the predictions derived from a hypothesis. Experiments can take anywhere from a college lab to CERNs Large Hadron Collider. There are difficulties in a statement of method, however. Though the scientific method is presented as a fixed sequence of steps. Not all steps take place in scientific inquiry, and are not always in the same order. Some philosophers and scientists have argued there is no scientific method, such as Lee Smolin. Nola and Sankey remark that For some, the idea of a theory of scientific method is yester-years debate
3.
Panel painting
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A panel painting is a painting made on a flat panel made of wood, either a single piece, or a number of pieces joined together. Panel painting is very old, it was a very prestigious medium in Greece and Rome, a series of 6th century BC painted tablets from Pitsa represent the oldest surviving Greek panel paintings. Most classical Greek paintings that were famous in their day seem to have been of a size comparable to modern works - perhaps up to a half-length portrait size. We can only attempt to imagine what these looked like from some detailed literary descriptions, the Severan Tondo, also from Egypt is one of the handful of non-funerary Graeco-Roman specimens to survive. Encaustic and tempera are the two used in antiquity. Encaustic largely ceased to be used after the early Byzantine icons, the earliest forms of panel painting were dossals, altar fronts and crucifixes. All were painted with images, commonly the Christ or the Virgin, with the saints appropriate to the dedication of the church. Donor portraits including members of the family are also often shown. Painted panels for altars are most numerous in Spain, especially Catalonia, the 13th and 14th centuries in Italy were a great period of panel painting, mostly altarpieces or other religious works. However, it is estimated that of all the paintings produced there,99.9 percent have been lost. The vast majority of Early Netherlandish paintings are on panel, and these include most of the earliest portraits, such as those by Jan van Eyck, and some other secular scenes. However, one of the earliest surviving oils on canvas is a French Madonna with angels of about 1410 in the Gemäldegalerie, Berlin, which is very early indeed for oil painting also. By the 15th century with the wealth of Europe, and later the appearance of humanism. Secular art opened the way to the creation of chests, painted beds, birth trays, many such works are now detached and hung framed on walls in museums. Many double-sided wings of altarpieces have also been sawn into two one-sided panels, canvas took over from panel in Italy by the first half of the 16th century, a change led by Mantegna and the artists of Venice. His panels are of notoriously complicated construction, containing as many as seventeen pieces of wood, for smaller cabinet paintings, copper sheets were another rival support, from the end of the 16th century, used by many artists including Adam Elsheimer. Many Dutch painters of the Golden Age used panel for their small works, by the 18th century it had become unusual to paint on panel, except for small works to be inset into furniture, and the like. But, for example, The National Gallery in London has two Goya portraits on panel, many other painting traditions also painted, and still paint, on wood, but the term is usually only used to refer to the Western tradition described above
4.
Radiocarbon dating
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Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed by Willard Libby in the late 1940s, Libby received the Nobel Prize for his work in 1960. The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting radiocarbon combines with oxygen to form radioactive carbon dioxide. When the animal or plant dies, it stops exchanging carbon with its environment, and from that point onwards the amount of 14C it contains begins to decrease as the 14C undergoes radioactive decay. Measuring the amount of 14C in a sample from a plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died. The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained. Research has been ongoing since the 1960s to determine what the proportion of 14C in the atmosphere has been over the past fifty thousand years. The resulting data, in the form of a curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the samples calendar age. Other corrections must be made to account for the proportion of 14C in different types of organisms, additional complications come from the burning of fossil fuels such as coal and oil, and from the above-ground nuclear tests done in the 1950s and 1960s. Conversely, nuclear testing increased the amount of 14C in the atmosphere, measurement of radiocarbon was originally done by beta-counting devices, which counted the amount of beta radiation emitted by decaying 14C atoms in a sample. The development of dating has had a profound impact on archaeology. In addition to permitting more accurate dating within archaeological sites than previous methods, histories of archaeology often refer to its impact as the radiocarbon revolution. Radiocarbon dating has allowed key transitions in prehistory to be dated, such as the end of the last ice age, and they synthesized 14C using the laboratorys cyclotron accelerator and soon discovered that the atoms half-life was far longer than had been previously thought. This was followed by a prediction by Serge A. Korff, then employed at the Franklin Institute in Philadelphia and it had previously been thought that 14C would be more likely to be created by deuterons interacting with 13C. At some time during World War II, Willard Libby, who was then at Berkeley, learned of Korffs research, in 1945, Libby moved to the University of Chicago where he began his work on radiocarbon dating. He published a paper in 1946 in which he proposed that the carbon in living matter might include 14C as well as non-radioactive carbon, by contrast, methane created from petroleum showed no radiocarbon activity because of its age. The results were summarized in a paper in Science in 1947, Libby and James Arnold proceeded to test the radiocarbon dating theory by analyzing samples with known ages
5.
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
6.
Ancient Greek
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Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD. It is often divided into the Archaic period, Classical period. It is antedated in the second millennium BC by Mycenaean Greek, the language of the Hellenistic phase is known as Koine. Koine is regarded as a historical stage of its own, although in its earliest form it closely resembled Attic Greek. Prior to the Koine period, Greek of the classic and earlier periods included several regional dialects, Ancient Greek was the language of Homer and of fifth-century Athenian historians, playwrights, and philosophers. It has contributed many words to English vocabulary and has been a subject of study in educational institutions of the Western world since the Renaissance. This article primarily contains information about the Epic and Classical phases of the language, Ancient Greek was a pluricentric language, divided into many dialects. The main dialect groups are Attic and Ionic, Aeolic, Arcadocypriot, some dialects are found in standardized literary forms used in literature, while others are attested only in inscriptions. There are also several historical forms, homeric Greek is a literary form of Archaic Greek used in the epic poems, the Iliad and Odyssey, and in later poems by other authors. Homeric Greek had significant differences in grammar and pronunciation from Classical Attic, the origins, early form and development of the Hellenic language family are not well understood because of a lack of contemporaneous evidence. Several theories exist about what Hellenic dialect groups may have existed between the divergence of early Greek-like speech from the common Proto-Indo-European language and the Classical period and they have the same general outline, but differ in some of the detail. The invasion would not be Dorian unless the invaders had some relationship to the historical Dorians. The invasion is known to have displaced population to the later Attic-Ionic regions, the Greeks of this period believed there were three major divisions of all Greek people—Dorians, Aeolians, and Ionians, each with their own defining and distinctive dialects. Often non-west is called East Greek, Arcadocypriot apparently descended more closely from the Mycenaean Greek of the Bronze Age. Boeotian had come under a strong Northwest Greek influence, and can in some respects be considered a transitional dialect, thessalian likewise had come under Northwest Greek influence, though to a lesser degree. Most of the dialect sub-groups listed above had further subdivisions, generally equivalent to a city-state and its surrounding territory, Doric notably had several intermediate divisions as well, into Island Doric, Southern Peloponnesus Doric, and Northern Peloponnesus Doric. The Lesbian dialect was Aeolic Greek and this dialect slowly replaced most of the older dialects, although Doric dialect has survived in the Tsakonian language, which is spoken in the region of modern Sparta. Doric has also passed down its aorist terminations into most verbs of Demotic Greek, by about the 6th century AD, the Koine had slowly metamorphosized into Medieval Greek
7.
Theophrastus
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Theophrastus, a Greek native of Eresos in Lesbos, was the successor to Aristotle in the Peripatetic school. He came to Athens at an age and initially studied in Platos school. After Platos death, he attached himself to Aristotle who took to Theophrastus his writings, when Aristotle fled Athens, Theophrastus took over as at the Lyceum. Theophrastus presided over the Peripatetic school for years, during which time the school flourished greatly. He is often considered the father of botany for his works on plants, after his death, the Athenians honoured him with a public funeral. His successor as head of the school was Strato of Lampsacus, the interests of Theophrastus were wide ranging, extending from biology and physics to ethics and metaphysics. His two surviving works, Enquiry into Plants and On the Causes of Plants, were an important influence on Renaissance science. There are also surviving works On Moral Characters, On Sensation, On Stones, in philosophy, he studied grammar and language and continued Aristotles work on logic. He also regarded space as the arrangement and position of bodies, time as an accident of motion. In ethics, he regarded happiness as depending on external influences as well as on virtue and he was a native of Eresos in Lesbos. His given name was Tyrtamus, but he became known by the nickname Theophrastus, given to him, it is said. After receiving instruction in philosophy in Lesbos from one Alcippus, he moved to Athens and he became friends with Aristotle, and when Plato died Theophrastus may have joined Aristotle in his self-imposed exile from Athens. When Aristotle moved to Mytilene on Lesbos in 345/4, it is likely that he did so at the urging of Theophrastus. It seems that it was on Lesbos that Aristotle and Theophrastus began their research into science, with Aristotle studying animals. Theophrastus probably accompanied Aristotle to Macedonia when Aristotle was appointed tutor to Alexander the Great in 343/2, around 335 BC, Theophrastus moved with Aristotle to Athens where Aristotle began teaching in the Lyceum. Aristotle in his will made him guardian of his children, including Nicomachus with whom he was close, Aristotle likewise bequeathed to him his library and the originals of his works, and designated him as his successor at the Lyceum. Eudemus of Rhodes also had claims to this position. Theophrastus presided over the Peripatetic school for years, and died at the age of eighty-five according to Diogenes
8.
Leonardo da Vinci
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He has been variously called the father of palaeontology, ichnology, and architecture, and is widely considered one of the greatest painters of all time. Sometimes credited with the inventions of the parachute, helicopter and tank, many historians and scholars regard Leonardo as the prime exemplar of the Universal Genius or Renaissance Man, an individual of unquenchable curiosity and feverishly inventive imagination. Much of his working life was spent in the service of Ludovico il Moro in Milan. He later worked in Rome, Bologna and Venice, and he spent his last years in France at the home awarded to him by Francis I of France, Leonardo was, and is, renowned primarily as a painter. Among his works, the Mona Lisa is the most famous and most parodied portrait, Leonardos drawing of the Vitruvian Man is also regarded as a cultural icon, being reproduced on items as varied as the euro coin, textbooks, and T-shirts. Perhaps fifteen of his paintings have survived, Leonardo is revered for his technological ingenuity. He conceptualised flying machines, a type of armoured fighting vehicle, concentrated power, an adding machine. Some of his inventions, however, such as an automated bobbin winder. A number of Leonardos most practical inventions are nowadays displayed as working models at the Museum of Vinci. He made substantial discoveries in anatomy, civil engineering, geology, optics, and hydrodynamics, today, Leonardo is widely considered one of the most diversely talented individuals ever to have lived. Leonardo was born on 15 April 1452 at the hour of the night in the Tuscan hill town of Vinci. He was the son of the wealthy Messer Piero Fruosino di Antonio da Vinci, a Florentine legal notary, and Caterina. Leonardo had no surname in the modern sense – da Vinci simply meaning of Vinci, his birth name was Lionardo di ser Piero da Vinci, meaning Leonardo. The inclusion of the title ser indicated that Leonardos father was a gentleman, little is known about Leonardos early life. He spent his first five years in the hamlet of Anchiano in the home of his mother and his father had married a sixteen-year-old girl named Albiera Amadori, who loved Leonardo but died young in 1465 without children. When Leonardo was sixteen, his father married again to twenty-year-old Francesca Lanfredini, pieros legitimate heirs were born from his third wife Margherita di Guglielmo and his fourth and final wife, Lucrezia Cortigiani. Leonardo received an education in Latin, geometry and mathematics. In later life, Leonardo recorded only two childhood incidents, one, which he regarded as an omen, was when a kite dropped from the sky and hovered over his cradle, its tail feathers brushing his face
9.
Henri-Louis Duhamel du Monceau
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Henri-Louis Duhamel du Monceau, was a French physician, naval engineer and botanist. Henri-Louis Duhamel du Monceau was born in Paris in 1700, the son of Alexandre Duhamel, in his youth he developed a passion for botany, but at his fathers wish he studied law from 1718 to 1721. After inheriting his fathers estate, he expanded it into a model farm. The results of work, he published in numerous publications. Commission by the French Academy of Sciences in 1728 Duhamel investigate the saffron cultivation in Gâtinais, in the following years continued to investigate physiological problems of crops. He also investigated growth of the trees in cooperation with Georges-Louis Leclerc de Buffon, from 1740 he also started focusing on meteorological problems, in particular their impact on agricultural production. In 1738 he was elected to the French Academy of Sciences and he was appointed Inspector-General of the Marine in 1739, and made scientific studies of shipbuilding, the conservation of wood, the paramedical and fair of sailors, etc. In 1741 he co-founded a school of Marine science, which in 1765 became the Ecole des Ingénieurs-Constructeurs and he was also involved in the foundation of the Académie de marine de Brest, on 31 July 1752. Following the work of Réaumur, in 1757 he released the Description des Arts et Métiers and his fondness for concrete problems, experimentation and popularization made him one of the forerunners of modern agronomy and silviculture. In 1767, du Monceau was elected a member of the Royal Swedish Academy of Sciences and he died in Paris on 13 August 1782. This achievement gained him admission to the French Academy of Sciences in 1738, from then on until his death he busied himself chiefly with making experiments in plant physiology. From a number of experiments he was led to believe himself able to explain the growth of bones and he was probably the first, in 1736, to distinguish clearly between the alkalis, potash and soda. From the year 1740 on he made meteorological observations, and kept records of the influence of the weather on agricultural production, for many years he was inspector-general of the marine, and applied his scientific experience to the improvement of naval construction. We are going to go through these operations in a few words to stimulate the curiosity to know their detail, the first operation is to have brass go through the drawing plate to calibrate it. This text is believed to have inspired Adam Smith for his famous work An Inquiry into the Nature, following the work of René Antoine Ferchault de Réaumur, in 1757 Duhamel released the Descriptions des Arts et Métiers and opposed the writers of the Encyclopédie. The Encyclopédistes didnt take this for granted, Criticised him on occasion, diderot seems to forget his debt to Duhamel du Monceau for the Encyclopédie, including the articles Agriculture, Rope, Pipe and Sugar. The succession of Grandjean Fouchy, perpetual secretary of the Academy of Sciences, clash sees supporters of Condorcet, led by dAlembert, and those of the astronomer Bailly, led by Count de Buffon. In 1773, the appointment of Condorcet as deputy Grandjean Fouchy sees the triumph of the party of the philosophers against the use of naval officers linked to Duhamel
10.
Georges-Louis Leclerc, Comte de Buffon
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Georges-Louis Leclerc, Comte de Buffon was a French naturalist, mathematician, cosmologist, and encyclopédiste. His works influenced the two generations of naturalists, including Jean-Baptiste Lamarck and Georges Cuvier. It has been said that Truly, Buffon was the father of all thought in natural history in the half of the 18th century. Buffon held the position of intendant at the Jardin du Roi, Georges was named after his mother’s uncle Georges Blaisot, the tax-farmer of the Duke of Savoy for all of Sicily. In 1714 Blaisot died childless, leaving a fortune to his seven-year-old godson. Benjamin Leclerc then purchased an estate containing the village of Buffon. Georges attended the Jesuit College of Godrans in Dijon from the age of ten onwards, from 1723–1726 he then studied law in Dijon, the prerequisite for continuing the family tradition in civil service. In 1728 Georges left Dijon to study mathematics and medicine at the University of Angers in France, in 1732 after the death of his mother and before the impending remarriage of his father, Georges left Kingston and returned to Dijon to secure his inheritance. Having added de Buffon to his name while traveling with the Duke, he repurchased the village of Buffon, with a fortune of about 80000 livres Buffon set himself up in Paris to pursue science, at first primarily mathematics and mechanics, and the increase of his fortune. In 1732 he moved to Paris, where he made the acquaintance of Voltaire, in 1734 he was admitted to the French Academy of Sciences. During this period he corresponded with the Swiss mathematician Gabriel Cramer and his protector Maurepas had asked the Academy of Sciences to do research on wood for the construction of ships in 1733. Soon afterward, Buffon began a study, performing some of the most comprehensive tests to date on the mechanical properties of wood. Included were a series of tests to compare the properties of small specimens with those of large members, in 1739 he was appointed head of the Parisian Jardin du Roi with the help of Maurepas, he held this position to the end of his life. Buffon was instrumental in transforming the Jardin du Roi into a research center. He also enlarged it, arranging the purchase of adjoining plots of land, thanks to his talent as a writer, he was invited to join Pariss second great academy, the Académie française in 1753. In his Discours sur le style, pronounced before the Académie française, he said, Writing well consists of thinking, feeling and expressing well, of clarity of mind, soul, the style is the man himself. Unfortunately for him, Buffons reputation as a literary stylist also gave ammunition to his detractors, The mathematician Jean le Rond DAlembert, for example, called him the great phrase-monger. In 1752 Buffon married Marie-Françoise de Saint-Belin-Malain, the daughter of an noble family from Burgundy
11.
Great Frost of 1709
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The severe cold occurred during the time of low sunspot activity known as the Maunder Minimum. William Derham recorded in Upminster, near London, a low of −12 °C on the night of 5 January 1709 and his contemporaries in the weather observation field in Europe likewise recorded lows down to −15 °C. Derham wrote in Philosophical Transactions, I believe the Frost was greater than any other within the Memory of Man, during the Great Northern War, the Swedish invasion of Russia led by Charles XII of Sweden against Russias Peter the Great was notably weakened by the severe winter. Sudden winter storms and frosts killed thousands during the Swedish armys winter offensives, France was particularly hard hit by the winter, with the subsequent famine estimated to have caused 600,000 deaths by the end of 1710. Because the famine occurred during wartime, there were contemporary nationalist claims that there were no deaths from starvation in the kingdom of France in 1709, according to Dennis Wheeler, a climatologist at the University of Sunderland, Something unusual seems to have been happening. The severity of the winter is thought to be an important factor in the emigration of the German Palatines from Central Europe and she wrote, Never in my life have I seen a winter such as this one. One of the key aims of the European Union Millennium Project is climate reconstruction, modern climate models do not appear to be entirely effective for explaining the climate of 1709
12.
Charles Babbage
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Charles Babbage KH FRS was an English polymath. A mathematician, philosopher, inventor and mechanical engineer, Babbage is best remembered for originating the concept of a programmable computer. His varied work in other fields has led him to be described as pre-eminent among the many polymaths of his century, parts of Babbages uncompleted mechanisms are on display in the Science Museum in London. In 1991, a perfectly functioning difference engine was constructed from Babbages original plans, built to tolerances achievable in the 19th century, the success of the finished engine indicated that Babbages machine would have worked. Babbages birthplace is disputed, but according to the Oxford Dictionary of National Biography he was most likely born at 44 Crosby Row, Walworth Road, London, a blue plaque on the junction of Larcom Street and Walworth Road commemorates the event. His date of birth was given in his obituary in The Times as 26 December 1792, the parish register of St. Marys Newington, London, shows that Babbage was baptised on 6 January 1792, supporting a birth year of 1791. Babbage was one of four children of Benjamin Babbage and Betsy Plumleigh Teape and his father was a banking partner of William Praed in founding Praeds & Co. of Fleet Street, London, in 1801. In 1808, the Babbage family moved into the old Rowdens house in East Teignmouth, around the age of eight, Babbage was sent to a country school in Alphington near Exeter to recover from a life-threatening fever. For a short time he attended King Edward VI Grammar School in Totnes, South Devon, Babbage then joined the 30-student Holmwood academy, in Baker Street, Enfield, Middlesex, under the Reverend Stephen Freeman. The academy had a library that prompted Babbages love of mathematics and he studied with two more private tutors after leaving the academy. The first was a clergyman near Cambridge, through him Babbage encountered Charles Simeon and his evangelical followers and he was brought home, to study at the Totnes school, this was at age 16 or 17. The second was an Oxford tutor, under whom Babbage reached a level in Classics sufficient to be accepted by Cambridge, Babbage arrived at Trinity College, Cambridge, in October 1810. He was already self-taught in some parts of mathematics, he had read in Robert Woodhouse, Joseph Louis Lagrange. As a result, he was disappointed in the standard mathematical instruction available at the university, Babbage, John Herschel, George Peacock, and several other friends formed the Analytical Society in 1812, they were also close to Edward Ryan. In 1812 Babbage transferred to Peterhouse, Cambridge and he was the top mathematician there, but did not graduate with honours. He instead received a degree without examination in 1814 and he had defended a thesis that was considered blasphemous in the preliminary public disputation, but it is not known whether this fact is related to his not sitting the examination. Considering his reputation, Babbage quickly made progress and he lectured to the Royal Institution on astronomy in 1815, and was elected a Fellow of the Royal Society in 1816. After graduation, on the hand, he applied for positions unsuccessfully
13.
Oak
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An oak is a tree or shrub in the genus Quercus of the beech family, Fagaceae. There are approximately 600 extant species of oaks, the common name oak also appears in the names of species in related genera, notably Lithocarpus, as well as in those of unrelated species such as Grevillea robusta and the Casuarinaceae. North America contains the largest number of oak species, with approximately 90 occurring in the United States, the second greatest center of oak diversity is China, which contains approximately 100 species. Oaks have spirally arranged leaves, with lobate margins in many species, also, the acorns contain tannic acid, as do the leaves, which helps to guard from fungi and insects. Many deciduous species are marcescent, not dropping dead leaves until spring, in spring, a single oak tree produces both male flowers and small female flowers. The fruit is a nut called an acorn, borne in a structure known as a cupule, each acorn contains one seed and takes 6–18 months to mature. The live oaks are distinguished for being evergreen, but are not actually a distinct group, the oak tree is a flowering plant. Oaks may be divided into two genera and a number of sections, The genus Quercus is divided into the following sections, Quercus, the white oaks of Europe, Asia and North America. Styles are short, acorns mature in 6 months and taste sweet or slightly bitter, the leaves mostly lack a bristle on their lobe tips, which are usually rounded. The type species is Quercus robur, Mesobalanus, Hungarian oak and its relatives of Europe and Asia. Styles long, acorns mature in about 6 months and taste bitter, the section Mesobalanus is closely related to section Quercus and sometimes included in it. Cerris, the Turkey oak and its relatives of Europe and Asia, styles long, acorn mature in 18 months and taste very bitter. The inside of the shell is hairless. Its leaves typically have sharp tips, with bristles at the lobe tip. Protobalanus, the live oak and its relatives, in southwest United States. Styles short, acorns mature in 18 months and taste very bitter, the inside of the acorn shell appears woolly. Leaves typically have sharp tips, with bristles at the lobe tip. Lobatae, the red oaks of North America, Central America, styles long, acorns mature in 18 months and taste very bitter
14.
Quercus stellata
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Quercus stellata is a North American species of oak in the white oak section. Quercus stellata is a slow growing oak that lives in dry soils, and is resistant to rot, fire. Interbreeding occurs among white oaks thus many hybrid species combinations occur, Quercus stellata is native to the eastern and central United States, and found in all the coastal states from Massachusetts to Texas, and as far inland as Nebraska. It is identifiable by the cross like shape formed by the leaf lobes. Quercus stellata is a small tree, typically 10–15 meters tall and trunk 30–60 cm in diameter. The leaves have a distinctive shape, with three perpendicular terminal lobes, shaped much like a Maltese Cross. They are leathery, and tomentose beneath, the branching pattern of this tree often gives it a rugged appearance. The acorns are 1. 5–2 cm long, and are mature in their first summer, the specific epithet stellata is latin for star it is named this because the trichome hairs on the bottom of the leaves, are stellate or star shaped. There are several variants of Quercus stellata named by American botanist Charles Sprague Sargent and they are both in a section of Quercus called the white oaks. In the white oak section Quercus stellata is sister taxa with the Quercus alba, Quercus stellata is sold and distributed as white oak. One identifiable difference between the two trees is that Q. stellata is hairy on the underside of the leaf, Quercus stellata is found in southeastern America, in the coast states from Massachusetts, to Texas, and inland to Iowa. Normally found at the edge of a forest It typically grows in dry sandy areas, because of its ability to grow in dry sites, attractive crown, and strong horizontal branches it is used in urban forestry. It is resistant to decay so it is used for ties, siding, planks, construction timbers, stair risers and treads, flooring, pulp, veneer, particle boards, fuel. It is used for food for deer, turkey, squirrels, and other rodents. Quercus stellata has evolved to survive fires by having thicker bark, Quercus stellata is useful for fire surveys where the tree rings are used to get a fire history of an area. IPNI Kew Flora of North America Plants. USDA
15.
Julius Theodor Christian Ratzeburg
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Julius Theodor Christian Ratzeburg was a German zoologist, botanist, entomologist, and forester. Ratzeburg was born in Berlin, the son of a professor at the school of the University of Berlin. He studied medicine and natural sciences in Berlin and was interested in botany. He became a lecturer at the University of Berlin in 1828. Two years later, he became professor of history there at the invitation of Friedrich Wilhelm Leopold Pfeil. He founded the garden of forestry at Eberswalde, working there until his retirement in 1869. He returned to Berlin, where he resided until his death, Ratzeburg was the author of important works on forestry and forest entomology, and is considered the founder of the latter discipline. He was notably interested in parasitic species, from 1827 to 1834, he wrote Medizinische Zoologie with Johann Friedrich von Brandt, which was a standard work for many years. Die Forstinsekten, Berlin 1837–1844, three volumes and a supplement, Die Ichneumonen der Forstinsekten, Berlin 1844–1852, three volumes. 1844, Die Ichneumonen der Forstinsekten in entomologischer und forstlicher Beziehung 1,1844, Die Ichneumonen der Forstinsekten in entomologischer und forstlicher Beziehung 3, viii+314pp,16 plates Berlin Ratzeburg, J. T. C. 1848, Die Ichneumonen der Forstinsekten in entomologischer und forstlicher Beziehung 2, vi+238pp,4 tables,3 plates Berlin Ratzeburg, Die Waldverderbnis oder dauernder Schaden, welcher durch Insektenfraß, Schälen etc. an lebenden Waldbäumen entsteht, Berlin, 1866–1868, two volumes. Berlin 1801 Digital edition by the University and State Library Düsseldorf Medizinische Zoologie, avec Brandt, Berlin, 1827–1834, abbildung und Beschreibung der in Deutschland wild wachsenden Giftgewächse, with Johann Friedrich von Brandt and Philipp Phoebus, Berlin 1834, new edition in 1838. Die Standortsgewächse und Unkräuter Deutschlands, Berlin 1859, in addition, Julius Theodor Christian Ratzeburg continued Friedrich Gottlob Haynes work Getreue Darstellung und Beschreibung der in der Arzneykunde gebräuchlichen Gewächse. Getreue Darstellung und Beschreibung der in der Arzneykunde gebräuchlichen Gewächse wie auch solcher, Digital Edition by the University and State Library Düsseldorf The major portion of this article was translated from French Wikipedia. Die Schädlinge des Waldes, Insekten und andere Tiere, inclusive 33 farbigen Tafeln pdf download
16.
Jacobus Kapteyn
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Prof Jacobus Cornelius Kapteyn FRS FRSE LLD was a Dutch astronomer. He carried out studies of the Milky Way and was the discoverer of evidence for galactic rotation. Kapteyn was born in Barneveld to Gerrit J. and Elisabeth C, Kapteyn, and went to the University of Utrecht to study mathematics and physics in 1868. In 1888 he became a member of the Royal Netherlands Academy of Arts, the results of this collaboration was the publication of Cape Photographic Durchmusterung, a catalog listing positions and magnitudes for 454,875 stars in the Southern Hemisphere. In 1897, as part of the work, he discovered Kapteyns Star. It had the highest proper motion of any star known until the discovery of Barnards Star in 1916. It was later realized that Kapteyns data had been the first evidence of the rotation of our Galaxy, in 1906, Kapteyn launched a plan for a major study of the distribution of stars in the Galaxy, using counts of stars in different directions. The plan involved measuring the apparent magnitude, spectral type, radial velocity and this enormous project was the first coordinated statistical analysis in astronomy and involved the cooperation of over forty different observatories. He was awarded the James Craig Watson Medal in 1913, in his model the Galaxy was thought to be 40,000 light years in size, the sun being relatively close to its center. The model was valid at high galactic latitudes but failed in the plane because of the lack of knowledge of interstellar absorption. It was only after Kapteyns death, in Amsterdam, that Robert Trumpler determined that the amount of interstellar reddening was actually greater than had been assumed. This discovery increased the estimate of the size to 100,000 light years. The astronomy institute of the University of Groningen is named after Kapteyn, a street in the city of Groningen is also named after Kapteyn, the J. C. Kapteynlaan. And the Isaac Newton Group of Telescopes on La Palma in the Canary Islands named the Jacobus Kapteyn Telescope after him and his daughter Henrietta married astronomer Ejnar Hertzsprung
17.
Robert Hartig
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Robert Hartig was a German forestry scientist and mycologist. He was educated at the Collegium Carolinum of Braunschweig, and at Berlin, in 1878 he was appointed professor of botany at Munich. Hartig made significant contributions to knowledge of vegetable pathology, prior to his investigations on the progressive stages of disease in trees, little or nothing had been done in this area, so that Hartig may be considered the founder of arboreal pathology. Hartig worked in Eberswalde and Munich, mainly in forest pathology and he described the Hartig net, a hyphal network that extends into the plant root. Die Rentabilität der Fichtennutzholz- und Buchenbrennholzwirthschaft im Harze und im Wesergebirge, beiträge zur Mycologie und Phytopathologie für Botaniker und Forstmänner, Berlin 1874. Die durch Pilze erzeugten Krankheiten der Waldbäume, die Zersetzungserscheinungen des Holzes der Nadelholzbäume und der Eiche in forstlicher botanischer und chemischer Richtung, Berlin 1878. 2nd ed. translated into English by William Somerville and H. Marshall Ward as Diseases of Trees, für Botaniker, Forstleute, Landwirthe und Gärtner,3. Völlig neu bearbeitete Auflage des Lehrbuches der Baumkrankheiten, Berlin 1900, das Holz der deutschen Nadelwaldbäume, Berlin 1885. 2nd ed. Der echte Hausschwamm und andere das Bauholz zerstörende Pilze,2, aufl. bearbeitet und herausgegeben von Dr. C. Das Holz der Rothbuche in anatomisch-physiologischer, chemischer und forstlicher Richtung, Lehrbuch der Anatomie und Physiologie der Pflanzen unter besonderer Berücksichtigung der Forstgewächse, Berlin 1891. Die anatomischen Unterscheidungsmerkmale der wichtigeren in Deutschland wachsenden Hölzer,4 and he was the son of Theodor Hartig and grandson of Georg Ludwig Hartig. Compartmentalization of decay in trees Robert Hart who specialized in forest gardening
18.
A. E. Douglass
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A. E. Douglass was an American astronomer. He discovered a correlation between tree rings and the cycle, and founded the discipline of dendrochronology, which is a method of dating wood by analyzing the growth ring pattern. He started his discoveries in this field in 1894 when he was working at the Lowell Observatory. During this time he was an assistant to Percival Lowell, but fell out with him when his experiments made him doubt the existence of canals on Mars. Craters on the Moon and Mars are named in his honor, after a 5-year hiatus from astronomy, Douglass left Flagstaff, Arizona in 1906 and accepted a position as Assistant Professor of Physics and Geography at the University of Arizona in Tucson, Arizona. Over the next 10 years Douglass was unable to secure funding from the University, during this period Douglass served the University of Arizona as Head of the Dept. of Physics and Astronomy, Interim President, and finally Dean of the College of Letters, Arts, & Sciences. Douglass made plans to use the Steward gift to construct a 36-inch Newtonian reflecting telescope, after a couple of failed castings, the Spencer Lens Co. of Buffalo, New York produced the mirror for the Steward Telescope. The telescope was installed in the observatory building in July 1922. Scientific research is business foresight on a large scale and it is knowledge obtained before it is needed. This I believe is the essence of education wherever such education is not strictly vocational, the student learns many facts and has much training. So it is with the research institutions, in this Observatory I sincerely hope and expect that the boundaries of human knowledge will be advanced along astronomical lines. Astronomy was the first science developed by our primitive ancestors thousands of years ago because it measured time, in 1909 Clark Wissler of the American Museum of Natural History organized the Archer M. Huntington Survey. One objective of this survey was to determine temporal arrangement of the American Southwests prehistoric ruins, on June 19,1914, the curator of the American Museum of Natural History wrote a letter to Douglass expressing his desire to begin archaeological analysis as early as possible. In April 1918 Wissler asked Douglass whether or not it would be possible to assign relative dates to samples that could not be dated absolutely. Although this information would not associate particular sites with exact years, upon receiving this news, Wissler was certain that Douglass would make a crucial contribution to archaeology. Douglass continued comparing samples between the two sites and concluded Pueblo Bonito actually predated Aztec Ruin by 40 to 45 years and these findings led to realization that relative dating could be used on many of the other ruins in the Southwest. Although promising steps had been made in solving the mystery of the ruins in the Southwest, on January 22,1922, Douglass was informed that the National Geographic Society could be a potential source of funding. By May of that year the idea of a Beam Expedition funded by the National Geographic Society was conceived, and expeditions took place in 1923 and 1928
19.
University of Arizona
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The University of Arizona is a public research university in Tucson, Arizona, United States. Founded in 1885, the UA was the first university in the Arizona Territory, the university operates two medical schools and is affiliated with the regions only academic medical centers. The university is home to the James E. Rogers College of Law and numerous other nationally ranked graduate. During the 2015-2016 academic year, there was an enrollment of 43,088 students. The University of Arizona is governed by the Arizona Board of Regents, the University of Arizona is one of the elected members of the Association of American Universities and is the only representative from the state of Arizona to this group. Known as the Arizona Wildcats, the teams are members of the Pac-12 Conference of the NCAA. UA athletes have won titles in several sports, most notably mens basketball, baseball. The official colors of the university and its teams are UA Red. After the passage of the Morrill Land-Grant Act of 1862, the push for a university in Arizona grew, the University of Arizona was approved by the Arizona Territorys Thieving Thirteenth Legislature in 1885, which also selected the city of Tucson to receive the appropriation to build the university. Tucson had hoped to receive the appropriation for the mental hospital. Tucson was largely disappointed with receiving what was viewed as an inferior prize. Construction of Old Main, the first building on campus, began on October 27,1887, and classes met for the first time in 1891 with 32 students in Old Main, which is still in use today. Because there were no schools in Arizona Territory, the university maintained separate preparatory classes for the first 23 years of operation. The University of Arizona offers 334 fields of study leading to bachelors, masters, doctoral, academic departments and programs are organized into colleges and schools. Currently, grades are given on a strict 4-point scale with A worth 4, B worth 3, C worth 2, D worth 1 and E worth zero points. In 2004, there were discussions with students and faculty that may lead the UA towards eventual usage of the grading system in future years. As of December 2015, the university uses the 4-points scale. The Center for World University Rankings in 2015 ranked Arizona 68th in the world, the 2015–16 Times Higher Education World University Rankings rated University of Arizona 163rd in the world and the 2016/17 QS World University Rankings ranked it 233rd
20.
Wood
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Wood is a porous and fibrous structural tissue found in the stems and roots of trees, and other woody plants. It is a material, a natural composite of cellulose fibers which are strong in tension embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, in a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots, Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. In 2005, the stock of forests worldwide was about 434 billion cubic meters. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy, in 1991 approximately 3.5 billion cubic meters of wood were harvested. Dominant uses were for furniture and building construction, a 2011 discovery in the Canadian province of New Brunswick discovered the earliest known plants to have grown wood, approximately 395 to 400 million years ago. Wood can be dated by carbon dating and in species by dendrochronology to make inferences about when a wooden object was created. People have used wood for millennia for many purposes, primarily as a fuel or as a material for making houses, tools, weapons, furniture, packaging, artworks. Constructions using wood date back ten thousand years, buildings like the European Neolithic long house were made primarily of wood. Recent use of wood has changed by the addition of steel. The year-to-year variation in tree-ring widths and isotopic abundances gives clues to the climate at that time. This process is known as growth, it is the result of cell division in the vascular cambium, a lateral meristem. These cells then go on to form thickened secondary cell walls, composed mainly of cellulose, hemicellulose, if the distinctiveness between seasons is annual, these growth rings are referred to as annual rings. Where there is little seasonal difference growth rings are likely to be indistinct or absent, if the bark of the tree has been removed in a particular area, the rings will likely be deformed as the plant overgrows the scar. It is usually lighter in color than that near the portion of the ring. The outer portion formed later in the season is known as the latewood or summerwood. However, there are differences, depending on the kind of wood
21.
Secondary growth
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Secondary growth occurs in most seed plants, but monocots usually lack secondary growth. If they do have secondary growth, it differs from the pattern of other seed plants. In many vascular plants, secondary growth is the result of the activity of the two lateral meristems, the cambium and vascular cambium. Arising from lateral meristems, secondary growth increases the girth of the plant root or stem, as long as the lateral meristems continue to produce new cells, the stem or root will continue to grow in diameter. In woody plants, this process produces wood, and shapes the plant into a tree with a thickened trunk, because this growth usually ruptures the epidermis of the stem or roots, plants with secondary growth usually also develop a cork cambium. The cork cambium gives rise to thickened cork cells to protect the surface of the plant, if this is kept up over many years, this process may produce a layer of cork. In the case of the cork oak it will yield harvestable cork, secondary growth also occurs in many nonwoody plants, e. g. tomato, potato tuber, carrot taproot and sweet potato tuberous root. A few long-lived leaves also have secondary growth, abnormal secondary growth does not follow the pattern of a single vascular cambium producing xylem to the inside and phloem to the outside as in ancestral lignophytes. Some dicots have secondary growth, e. g. in Bougainvillea a series of cambia arise outside the oldest phloem. Ancestral monocots lost their secondary growth and their stele has changed in a way it could not be recovered without major changes that are unlikely to occur. In some other monocot stems with secondary growth, a cambium forms. Some monocot stems increase in diameter due to the activity of a primary thickening meristem, bark Cambium Root Stem Tylosis Dendrochronology Herbchronology
22.
Cross section (geometry)
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In geometry and science, a cross section is the intersection of a body in three-dimensional space with a plane, or the analog in higher-dimensional space. Cutting an object into slices creates many parallel cross sections, conic sections – circles, ellipses, parabolas, and hyperbolas – are formed by cross-sections of a cone at various different angles, as seen in the diagram at left. Any planar cross-section passing through the center of an ellipsoid forms an ellipse on its surface, a cross-section of a cylinder is a circle if the cross-section is parallel to the cylinders base, or an ellipse with non-zero eccentricity if it is neither parallel nor perpendicular to the base. If the cross-section is perpendicular to the base it consists of two line segments unless it is just tangent to the cylinder, in which case it is a single line segment. A cross section of a polyhedron is a polygon, if instead the cross section is taken for a fixed value of the density, the result is an iso-density contour. For the normal distribution, these contours are ellipses, a cross section can be used to visualize the partial derivative of a function with respect to one of its arguments, as shown at left. In economics, a function f specifies the output that can be produced by various quantities x and y of inputs, typically labor. The production function of a firm or a society can be plotted in three-dimensional space, also in economics, a cardinal or ordinal utility function u gives the degree of satisfaction of a consumer obtained by consuming quantities w and v of two goods. Cross sections are used in anatomy to illustrate the inner structure of an organ. A cross section of a trunk, as shown at left, reveals growth rings that can be used to find the age of the tree. Cavalieris principle states that solids with corresponding sections of equal areas have equal volumes. The cross-sectional area of an object when viewed from an angle is the total area of the orthographic projection of the object from that angle. For example, a cylinder of height h and radius r has A ′ = π r 2 when viewed along its central axis, a sphere of radius r has A ′ = π r 2 when viewed from any angle. For a convex body, each ray through the object from the viewers perspective crosses just two surfaces, descriptive geometry Exploded view drawing Graphical projection Plans
23.
Trunk (botany)
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The trunk is the most important part of the tree for timber production. Trunks occur both in true woody plants as well as plants such as palms and other monocots. In all plants, trunks thicken over time due to formation of secondary growth, trunks can be vulnerable to damage, including sunburn. Trunks which are cut down in logging are generally called logs, basal area Tree measurement Tree volume measurement Diameter at breast height Inside a tree trunk from the University of the Western Cape
24.
Bark (botany)
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Bark is the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines, and shrubs, Bark refers to all the tissues outside of the vascular cambium and is a nontechnical term. It overlays the wood and consists of the bark and the outer bark. The inner bark, which in older stems is living tissue, the outer bark in older stems includes the dead tissue on the surface of the stems, along with parts of the innermost periderm and all the tissues on the outer side of the periderm. The outer bark on trees which lies external to the last formed periderm is also called the rhytidome, Bark has been used to make cloth, canoes, and ropes and used as a surface for paintings and map making. A number of plants are grown for their attractive or interesting bark colorations. What is commonly called bark includes a number of different tissues, Cork is an external, secondary tissue that is impermeable to water and gases, and is also called the phellem. The cork is produced by the cork cambium which is a layer of active cells which serve as a lateral meristem for the periderm. The cork cambium, which is called the phellogen, is normally only one cell layer thick. The phelloderm, which is not always present in all barks, is a layer of cells formed by, together, the phellem, phellogen and phelloderm constitute the periderm. Cork cell walls contain suberin, a substance which protects the stem against water loss, the invasion of insects into the stem. The cambium tissues, i. e. Phloem is a nutrient-conducting tissue composed of sieve tubes or sieve cells mixed with parenchyma, the cortex is the primary tissue of stems and roots. In stems the cortex is between the layer and the phloem, in roots the inner layer is not phloem. From the outside to the inside of a woody stem. The bark includes through, and is composed of periderm and phloem, as the stem ages and grows, changes occur that transform the surface of the stem into the bark. The epidermis is a layer of cells that cover the plant body, including the stems, leaves, flowers and fruits, in old stems the epidermal layer, cortex, and primary phloem become separated from the inner tissues by thicker formations of cork. Due to the cork layer these cells die because they do not receive water. This dead layer is the rough corky bark that forms around tree trunks, often a secondary covering called the periderm forms on small woody stems and many non woody plants, which is composed of cork, the cork cambium, and the phelloderm
25.
Meristem
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A meristem is the tissue in most plants containing undifferentiated cells, found in zones of the plant where growth can take place. Meristematic cells give rise to organs of the plant and keep the plant growing. The shoot apical meristem gives rise to organs like the leaves and flowers, SAM and RAM cells divide rapidly and are considered indeterminate, in that they do not possess any defined end status. In that sense, the cells are frequently compared to the stem cells in animals. The term meristem was first used in 1858 by Karl Wilhelm von Nägeli in his book Beiträge zur Wissenschaftlichen Botanik and it is derived from the Greek word merizein, meaning to divide, in recognition of its inherent function. In general, differentiated plant cells cannot divide or produce cells of a different type, therefore, cell division in the meristem is required to provide new cells for expansion and differentiation of tissues and initiation of new organs, providing the basic structure of the plant body. Meristematic cells are incompletely or not at all differentiated, and are capable of continued cellular division, furthermore, the cells are small and protoplasm fills the cell completely. The cytoplasm does not contain differentiated plastids, although they are present in rudimentary form, meristematic cells are packed closely together without intercellular cavities. The cell wall is a thin primary cell wall. Maintenance of the cells requires a balance between two processes, organ initiation and stem cell population renewal. Apical meristems are the completely undifferentiated meristems in a plant and these differentiate into three kinds of primary meristems. The primary meristems in turn produce the two secondary meristem types and these secondary meristems are also known as lateral meristems because they are involved in lateral growth. At the meristem summit, there is a group of slowly dividing cells. Cells of this zone have a stem cell function and are essential for meristem maintenance, the proliferation and growth rates at the meristem summit usually differ considerably from those at the periphery. Meristems also are induced in the roots of such as soybean, Lotus japonicus, pea. Cells of the inner or outer cortex in the window of nodulation just behind the developing root tip are induced to divide. The critical signal substance is the lipo-oligosaccharide Nod-factor, decorated with groups to allow specificity of interaction. The Nod factor receptor proteins NFR1 and NFR5 were cloned from several legumes including Lotus japonicus, Medicago truncatula, regulation of nodule meristems utilizes long distance regulation commonly called Autoregulation of Nodulation
26.
Season
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A season is a division of the year marked by changes in weather, ecology and hours of daylight. Seasons result from the orbit of the Earth around the Sun. During May, June, and July, the northern hemisphere is exposed to direct sunlight because the hemisphere faces the sun. The same is true of the hemisphere in November, December. It is the tilt of the Earth that causes the Sun to be higher in the sky during the months which increases the solar flux. However, due to lag, June, July, and August are the hottest months in the northern hemisphere and December, January. In temperate and subpolar regions, four calendar-based seasons are recognized, spring, summer, autumn or fall. Ecologists often use a model for temperate climate regions, prevernal, vernal, estival, serotinal, autumnal. Many tropical regions have two seasons, the rainy, wet, or monsoon season and the dry season, some have a third cool, mild, or harmattan season. Seasons often held special significance for agrarian societies, whose lives revolved around planting and harvest times, in some parts of the world, some other seasons capture the timing of important ecological events such as hurricane season, tornado season, and wildfire season. The most historically important of these are the three seasons—flood, growth, and low water—which were previously defined by the annual flooding of the Nile in Egypt. The seasons result from the Earths axis of rotation being tilted with respect to its orbital plane by an angle of approximately 23.5 degrees, regardless of the time of year, the northern and southern hemispheres always experience opposite seasons. This is because during summer or winter, one part of the planet is directly exposed to the rays of the Sun than the other. For approximately half of the year, the northern hemisphere tips toward the Sun, for the other half of the year, the same happens, but in the southern hemisphere instead of the northern, with the maximum around December 21. The two instants when the Sun is directly overhead at the Equator are the equinoxes. Also at that moment, both the North Pole and the South Pole of the Earth are just on the terminator, and hence day and night are equally divided between the northern and southern hemispheres. Around the March equinox, the northern hemisphere will be experiencing spring as the hours of daylight increase, the effect of axial tilt is observable as the change in day length and altitude of the Sun at noon during a year. Between this effect and the daylight hours, the axial tilt of the Earth accounts for most of the seasonal variation in climate in both hemispheres
27.
Temperate climate
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In geography, temperate or tepid latitudes of Earth lie between the tropics and the polar regions. The temperatures in these regions are relatively moderate, rather than extremely hot or cold. The north temperate zone extends from the Tropic of Cancer to the Arctic Circle, the south temperate zone extends from the Tropic of Capricorn to the Antarctic Circle. In some climate classifications, the zone is often divided into several smaller climate zones. These include Humid subtropical climate, Mediterranean climate, oceanic, subtropical climates are located between 23. 5° and 35. 0° north or south latitude on the eastern or leeward sides of landmasses. This climate has long, generally hot, summers and short, mild winters and these climates may occur in southern Asia, the southeastern United States, parts of eastern Australia, and in eastern coastal South America. Mediterranean climates, occur between 30° and 42° north and south latitude, on the sides of landmasses. This climate has hot summers and short mild winters, however, seasonal rainfall is the opposite of that of the subtropical humid type. These climates occur near the rimlands of the Mediterranean Sea, in western Australia, in California, the oceanic climates occur in the higher middle latitudes, between 45° and 60° north and south latitude. They are created by the flow from the cool high latitude oceans to their west. This causes the climate to have cool summers and cool winters, annual rainfall is spread throughout the entire year. Regions with this climate include Western Europe, northwestern North America, the Continental climates occur in middle latitudes, between 35° or 40° to 55°. These climates are normally inland or on sides of landmasses. They feature warm to hot summers and cold winters, with a large temperature variation. Regions with this climate include northern temperate Asia, the northern United States, southern Canada, the vast majority of the worlds human population resides in temperate zones, especially in the northern hemisphere, due to its greater mass of land. The richest temperate flora in the world is found in southern Africa, geographical zone Habitat Köppen climate classification Middle latitudes Polar circle Subtropics
28.
Pinus taeda
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Pinus taeda, commonly known as loblolly pine, is one of several pines native to the Southeastern United States, from central Texas east to Florida, and north to Delaware and southern New Jersey. The wood industry classifies the species as a yellow pine. U. S. Forest Service surveys found that loblolly pine is the second most common species of tree in the United States, for its timber, the pine species is regarded as the most commercially important tree in Southeastern US. The common name loblolly is given because the species is found mostly in lowlands. Loblolly pine is the first among over 100 species of Pinus to have its genome sequenced. As of March 2014 it is the organism having the largest sequenced genome size and its genome, with 22 billion base pairs, is seven times larger than that of humans. Loblolly pine can reach a height of 30–35 m with a diameter of 0. 4–1.5 m, exceptional specimens may reach 50 m tall, the largest of the southern pines. The needles usually last up to two years before they fall, which gives the species its evergreen character, although some needles fall throughout the year due to severe weather, insect damage, and drought, most needles fall during the autumn and winter of their second year. The seed cones are green, ripening pale buff-brown, 7–13 cm in length, 2–3 cm broad when closed, opening to 4–6 cm wide, each scale bearing a sharp 3–6 mm spine. The tallest loblolly pine currently known, which is 51.4 m tall, and the largest, which measures 42 cubic meters in volume, are in Congaree National Park. The word loblolly is a combination of lob, referring to thick heavy bubbling of cooking porridge, and lolly, in the southern United States, the word is used to mean a mudhole, a mire, a sense derived from an allusion to the consistency of porridge. Hence the pine is named as it is found in lowlands. Loblolly pines grow well in clay soil, which is common throughout the South. For the scientific name, Pinus is the Latin name for the pines, the rate of growth is rapid, even among the generally fast-growing southern pines. The yellowish, resinous wood is prized for lumber, but is also used for wood pulp. This tree is grown in extensive plantations. Loblolly pine is the pine of the Lost Pines Forest around Bastrop, Texas and these are isolated populations on areas of acidic sandy soil, surrounded by alkaline clays that are poor for pine growth. A study using loblolly pines showed that atmospheric carbon dioxide levels may help the trees to endure ice storms better
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Cheraw, South Carolina
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Cheraw is a town on the Pee Dee River in Chesterfield and Marlboro counties, South Carolina, United States. The population was 5,851 at the 2010 census and it has been nicknamed The Prettiest Town in Dixie. The harbor tug USS Cheraw was named in the towns honor, when the first Europeans arrived in the area it was inhabited by the Cheraw and Pee Dee American Indian tribes. The Cheraw lived near the hill, near present-day Cheraw. Survivors joined the Catawba Confederacy for safety and left their name in history, only a few scattered Cheraw families remained by the time of the American Revolution. A few European settlers entered their territory in the 1730s, forced upriver when the Welsh came to claim the Welsh Baptist lands granted by the English government in the area around Society Hill. Many of the settlers of the 1740s in Cheraw were ethnic English, Scots, French Huguenots. By 1750, Cheraw had become an established Anglo-American village with a growing river trade and it was one of only six places in South Carolina that appeared on English maps at the time. In the 1760s, Joseph and Eli Kershaw were granted the part of Cheraw that is now the historic district. The Kershaws laid out a street system. By 1830 settlers lined all the streets with rows of elms, the Kershaws originally called the town Chatham, but people never accepted this name, continuing to call it Cheraw or Cheraw Hill. There was a lack of organization and rule during the beginning of the 1740s in the backcountry of South Carolina and this lack of organization and unrest was an underlying cause of the resentment people of these areas felt toward the British Crown. In the Pee Dee area, planters organized a group called the Regulators to help bring order to the area. In 1768 St. David’s Parish, the last Anglican Church built in South Carolina under King George III, was established to serve the civic. Later a judicial district and courthouse were established to deal with the problem of order. However, there was much discontent with the ruling authority. Many area men played prominent roles in the American Revolution and they included Claudius Pegues, General Henry W. Harrington, the Ellerbe brothers, Philip Pledger, and Eli Kershaw. Other towns in this line of defense included Camden, South Carolina, Cheraw also became a strategic point for the Americans
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Elm
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Elms are deciduous and semi-deciduous trees comprising the flowering plant genus Ulmus in the plant family Ulmaceae. The genus first appeared in the Miocene geological period about 20 million years ago, Elms are components of many kinds of natural forests. Some individual elms reached great size and age, however, in recent decades, most mature elms of European or North American origin have died from Dutch elm disease, caused by a microfungus dispersed by bark beetles. In response, disease-resistant cultivars have been developed, capable of restoring the elm to forestry, eight species are endemic to North America, and a smaller number to Europe, the greatest diversity is found in Asia. The classification adopted in the List of elm species, varieties, cultivars, a large number of synonyms have accumulated over the last three centuries, their currently accepted names can be found in the list List of elm Synonyms and Accepted Names. Botanists who study elms and argue over elm identification and classification are called pteleologists, as part of the sub-order urticalean rosids they are distant cousins of cannabis, hops, and nettles. The name Ulmus is the Latin name for these trees, while the English elm, the genus is hermaphroditic, having apetalous perfect flowers which are wind-pollinated. Elm leaves are alternate, with simple, single- or, most commonly, doubly serrate margins, usually asymmetric at the base, the fruit is a round wind-dispersed samara flushed with chlorophyll, facilitating photosynthesis before the leaves emerge. All species are tolerant of a range of soils and pH levels but, with few exceptions. The elm tree can grow to height, often with a split trunk creating a vase-shape profile. Dutch elm disease devastated elms throughout Europe and much of North America in the half of the 20th century. It derives its name Dutch from the first description of the disease and its cause in the 1920s by the Dutch botanists Bea Schwarz, DED is caused by a micro-fungus transmitted by two species of Scolytus elm-bark beetle which act as vectors. The disease affects all species of elm native to North America and Europe, fungal spores, introduced into wounds in the tree caused by the beetles, invade the xylem or vascular system. The tree responds by producing tyloses, effectively blocking the flow from roots to leaves, woodland trees in North America are not quite as susceptible to the disease because they usually lack the root-grafting of the urban elms and are somewhat more isolated from each other. In France, inoculation with the fungus of over three hundred clones of the European species failed to find a single variety possessed of any significant resistance. The second, far more virulent strain of the disease Ophiostoma novo-ulmi was identified in Europe in the late 1960s, Elm phloem necrosis is a disease of elm trees that is spread by leafhoppers or by root grafts. This very aggressive disease, with no cure, occurs in the Eastern United States, southern Ontario in Canada. It is caused by phytoplasmas which infect the phloem of the tree, infection and death of the phloem effectively girdles the tree and stops the flow of water and nutrients
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Southwestern United States
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The population of the area is around 11 million people, with over half that in Arizona, the most populous cities are Phoenix, El Paso, Las Vegas, Albuquerque, and Tucson. Most of the area was part of the Viceroyalty of New Spain in the Spanish Empire before becoming part of Mexico and it became part of the United States through the Treaty of Guadalupe Hidalgo and the Gadsden Purchase. The deserts dominate the southern and western reaches of the area, the two major rivers of the region are the Colorado River, running in the northern and western areas, and the Rio Grande, running in the south. Formed approximately 8000 years ago, the Chihuahuan Desert is a dry desert. The Chihuahuan Desert spreads across the portion of the region, covering from southeastern Arizona, across southern New Mexico. While it is the second largest desert in the United States, only a third of the desert is within the United States, El Paso is the major city in this desert, with other smaller cities being Las Cruces and Roswell in New Mexico. The Chihuahuan is a rain shadow desert, formed two mountain ranges which block oceanic precipitation from reaching the area. The most prolific plants in this region are agave, yucca and creosote bushes, when people think of the desert southwest, the landscape of the Sonoran Desert is what mostly comes to mind. Rainfall averages between 4–12 inches per year, and the deserts most widely known inhabitant is the saguaro cactus and it is bounded on the northwest by the Mojave Desert, to the north by the Colorado Plateau and to the east by the Arizona Mountains forests and the Chihuahuan Desert. The portion of the Sonora Desert which lies in the Southwestern United States is the most populated area within the region. Six of the top ten major population centers of the region are found within its borders, Phoenix, Tucson, Mesa, Chandler, Glendale, also within its borders are Yuma and Prescott Arizona. The most northwest portion of the American Southwest is covered by the Mojave Desert, bordered on the south by the Sonoran Desert and the east by the Colorado Plateau, its range within the region makes up the southeast tip of Nevada, and the northwestern corner of Arizona. In terms of topography, the Mojave is very similar to the Great Basin Desert, the Mojave is the smallest, driest and hottest desert within the United States. The Mojave gets less than six inches of rain annually, the most prolific vegetation is the tall Joshua tree, which grow as tall as 40 feet, and are thought to live almost 1000 years. Other major vegetation includes the Parry saltbush and the Mojave sage, the Colorado Plateau varies from the large stands of forests in the west, including the largest stand of ponderosa pine trees in the world, to the Mesas to the east. Although not called a desert, the Colorado Plateau is mostly made up of high desert, the Plateau is characterized by a series of plateaus and mesas, interspersed with canyons. The most dramatic example is the Grand Canyon, but that is one of many dramatic vistas included within the Plateau, which includes spectacular lava formations, painted deserts, sand dunes, and badlands. One of the most distinctive features of the Plateau is its longevity, the Plateau can be divided into six sections, three of which fall into the Southwest region
32.
White Mountains (California)
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The White Mountains of California and Nevada are a triangular fault-block mountain range facing the Sierra Nevada across the upper Owens Valley. They extend for approximately 60 mi as an elevated plateau about 20 mi wide on the south. The ranges broad southern end is near the community of Big Pine, the narrow northern end is at Montgomery Pass, where U. S. Route 6 crosses. The range lies within the section of the Inyo National Forest. Middle slopes from 6,500 to 8,200 ft have somewhat denser stands of piñon pine and these upper and lower conifer zones are often separated by a zone of mountain mahogany brush. Various subspecies of sagebrush extend from surrounding valleys to the alpine zone. A bristlecone pine in the part of the range is the oldest known living tree in the world. Pine nuts from piñon pine stands were harvested as a staple food by Paiute Indians whose descendants still live in adjacent valleys. The White Mountains also have small remnant groves of pine, Jeffrey pine, ponderosa pine, Sierra juniper. A number of plant species are endemic to the White Mountains, fauna include two herds of bighorn sheep, mule deer, marmots and feral horses. Permanent streams have no fish, but there are naturalized populations of trout including rare Paiute cutthroat trout which is protected from angling. Birds include Clarks nutcracker and other Corvidae which eat and cache pine nuts, cattle from ranches in surrounding valleys are still grazed under permit as high as the alpine zone. Historically sheep were grazed in large numbers, introducing diseases from which the native Bighorn Sheep populations are still slowly recovering. Before European colonization of surrounding valleys in the mid 19th century, Paiute Indians occupied summer hunting camps up to about 13,100 ft, the highest point in the range is White Mountain Peak, which at 14,252 ft is the third-highest summit in California. This peak is actually an extinct volcano rising about 1,600 ft above the plateau surface, the summit is composed of Mesozoic metavolcanic rock – lava lifted and melted by rising granite. The volcano itself is long since gone, the White Mountains are the highest range completely inside the Great Basin, although the adjacent Sierra Nevada Range along the basins western edge has two higher summits. The entire range is within the Inyo National Forest, a four-wheel drive road reaches the summit from the south to service the summit laboratory of the White Mountain Research Station. The road is normally gated seven miles from the summit at an elevation of 11,680 ft, the bench includes Mt. Hogue at 12,743 ft. and further north Mt. Dubois at 13,559 ft. the high point on the plateau
33.
Bristlecone pine
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A bristlecone pine is one of three species of pine trees. All three species are long-lived and highly resilient to harsh weather and bad soils, One of the three species, Pinus longaeva, is among the longest-lived life forms on Earth. The oldest Pinus longaeva is more than 5,000 years old, despite their potential age and low reproductive rate, bristlecone pines, particularly Pinus longaeva, are usually a first-succession species, tending to occupy new open ground. They generally compete poorly in less-than-harsh environments, making hard to cultivate. In gardens, they succumb quickly to root rot and they do very well, however, where most other plants cannot even grow, such as in rocky dolomitic soils in areas with virtually no rainfall. Bristlecone pines grow in scattered subalpine groves at high altitude in arid regions of the Western United States, the name comes from the prickles on the female cones. There are three related species of bristlecone pines, Great Basin bristlecone pine in Utah, Nevada. The famous longest-lived species, often the term Bristlecone pine refers to this tree in particular, Rocky Mountains bristlecone pine in Colorado, New Mexico and Arizona. The most populous species, capable of forming closed canopies and, foxtail pine with two disjunct populations found in the Klamath Mountains and the southern Sierra Nevada. A small outlying population was reported in southern Oregon, but was proven to have been misidentified, forms the thickest groves of the three. At least some of the three species can hybridize in cultivation, but the ranges of wild populations do not overlap, Bristlecone pines grow in isolated groves just below the tree line, between 5,600 and 11,200 ft elevation on dolomitic soils. The trees grow in soils that are shallow lithosols, usually derived from dolomite and sometimes limestone, dolomite soils are alkaline, high in calcium and magnesium, and low in phosphorus. Those factors tend to other plant species, allowing bristlecones to thrive. Because of cold temperatures, dry soils, high winds, and short growing seasons, even the trees needles, which grow in bunches of five, can remain on the tree for forty years, which gives the trees terminal branches the unique appearance of a long bottle brush. The bristlecone pines root system is composed of highly branched, shallow roots, while a few large. The bristlecone pine is extremely drought tolerant due to its branched shallow root system, its waxy needles, the wood is very dense and resinous, and thus resistant to invasion by insects, fungi, and other potential pests. The trees longevity is due in part to the extreme durability. While other species of trees that grow nearby suffer rot, bare bristlecone pines can endure, even death, often still standing on their roots
34.
Species
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In biology, a species is the basic unit of biological classification and a taxonomic rank. A species is defined as the largest group of organisms in which two individuals can produce fertile offspring, typically by sexual reproduction. While this definition is often adequate, looked at more closely it is problematic, for example, with hybridisation, in a species complex of hundreds of similar microspecies, or in a ring species, the boundaries between closely related species become unclear. Other ways of defining species include similarity of DNA, morphology, all species are given a two-part name, a binomial. The first part of a binomial is the genus to which the species belongs, the second part is called the specific name or the specific epithet. For example, Boa constrictor is one of four species of the Boa genus, Species were seen from the time of Aristotle until the 18th century as fixed kinds that could be arranged in a hierarchy, the great chain of being. In the 19th century, biologists grasped that species could evolve given sufficient time, Charles Darwins 1859 book The Origin of Species explained how species could arise by natural selection. Genes can sometimes be exchanged between species by horizontal transfer, and species may become extinct for a variety of reasons. In his biology, Aristotle used the term γένος to mean a kind, such as a bird or fish, a kind was distinguished by its attributes, for instance, a bird has feathers, a beak, wings, a hard-shelled egg, and warm blood. A form was distinguished by being shared by all its members, Aristotle believed all kinds and forms to be distinct and unchanging. His approach remained influential until the Renaissance, when observers in the Early Modern period began to develop systems of organization for living things, they placed each kind of animal or plant into a context. Many of these early delineation schemes would now be considered whimsical, animals likewise that differ specifically preserve their distinct species permanently, one species never springs from the seed of another nor vice versa. In the 18th century, the Swedish scientist Carl Linnaeus classified organisms according to shared physical characteristics and he established the idea of a taxonomic hierarchy of classification based upon observable characteristics and intended to reflect natural relationships. At the time, however, it was widely believed that there was no organic connection between species, no matter how similar they appeared. However, whether or not it was supposed to be fixed, by the 19th century, naturalists understood that species could change form over time, and that the history of the planet provided enough time for major changes. Jean-Baptiste Lamarck, in his 1809 Zoological Philosophy, described the transmutation of species, proposing that a species could change over time, in 1859, Charles Darwin and Alfred Russel Wallace provided a compelling account of evolution and the formation of new species. Darwin argued that it was populations that evolved, not individuals and this required a new definition of species. Darwin concluded that species are what appear to be, ideas
35.
Ant
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Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from ancestors in the Cretaceous period, about 99 million years ago. More than 12,500 of an total of 22,000 species have been classified. They are easily identified by their antennae and the distinctive node-like structure that forms their slender waists. Larger colonies consist mostly of sterile, wingless females forming castes of workers, soldiers, nearly all ant colonies also have some fertile males called drones and one or more fertile females called queens. The colonies are described as superorganisms because the ants appear to operate as a unified entity, Ants have colonised almost every landmass on Earth. The only places lacking indigenous ants are Antarctica and a few remote or inhospitable islands, Ants thrive in most ecosystems and may form 15–25% of the terrestrial animal biomass. Their success in so many environments has been attributed to their organisation and their ability to modify habitats, tap resources. Their long co-evolution with other species has led to mimetic, commensal, parasitic, Ant societies have division of labour, communication between individuals, and an ability to solve complex problems. These parallels with human societies have long been an inspiration and subject of study, many human cultures make use of ants in cuisine, medication, and rituals. Some species are valued in their role as biological pest control agents and their ability to exploit resources may bring ants into conflict with humans, however, as they can damage crops and invade buildings. Some species, such as the red imported fire ant, are regarded as invasive species, all of these words come from West Germanic *ēmaitijǭ, and the original meaning of the word was the biter. The family Formicidae belongs to the order Hymenoptera, which also includes sawflies, bees, Ants evolved from a lineage within the aculeate wasps, and a 2013 study suggests that they are a sister group of the Apoidea. In 1966, E. O. Wilson and his colleagues identified the remains of an ant that lived in the Cretaceous period. The specimen, trapped in amber dating back to around 92 million years ago, has found in some wasps. Sphecomyrma possibly was a ground forager, while Haidomyrmex and Haidomyrmodes, older ants in the genus Sphecomyrmodes have been found in 99 million year-old amber from Myanmar. After the rise of flowering plants about 100 million years ago they diversified and assumed ecological dominance around 60 million years ago. Some groups, such as the Leptanillinae and Martialinae, are suggested to have diversified from early primitive ants that were likely to have been predators underneath the surface of the soil, during the Cretaceous period, a few species of primitive ants ranged widely on the Laurasian supercontinent
36.
Calibration
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Calibration in measurement technology and metrology is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy. Such a standard could be another measurement device of known accuracy, strictly, the term calibration means just the act of comparison, and does not include any subsequent adjustment. The calibration standard is normally traceable to a national standard held by a National Metrological Institute and this definition states that the calibration process is purely a comparison, but introduces the concept of Measurement uncertainty in relating the accuracies of the device under test and the standard. The increasing need for accuracy and uncertainty and the need to have consistent. In many countries a National Metrology Institute will exist which will maintain primary standards of measurement which will be used to provide traceability to customers instruments by calibration. The NMI supports the metrological infrastructure in that country by establishing an unbroken chain, examples of National Metrology Institutes are NPL in the UK, NIST in the United States, PTB in Germany and many others. This may be done by national standards laboratories operated by the government or by private firms offering metrology services, quality management systems call for an effective metrology system which includes formal, periodic, and documented calibration of all measuring instruments. ISO9000 and ISO17025 standards require that these actions are to a high level. To communicate the quality of a calibration the calibration value is often accompanied by a traceable uncertainty statement to a confidence level. This is evaluated through careful uncertainty analysis, some times a DFS is required to operate machinery in a degraded state. Whenever this does happen, it must be in writing and authorized by a manager with the assistance of a calibration technician. Measuring devices and instruments are categorized according to the quantities they are designed to measure. These vary internationally, e. g. NIST 150-2G in the U. S. the standard instrument for each test device varies accordingly, e. g. a dead weight tester for pressure gauge calibration and a dry block temperature tester for temperature gauge calibration. g. This is the perception of the instruments end-user, however, very few instruments can be adjusted to exactly match the standards they are compared to. For the vast majority of calibrations, the process is actually the comparison of an unknown to a known. The calibration process begins with the design of the instrument that needs to be calibrated. The design has to be able to hold a calibration through its calibration interval, in other words, the design has to be capable of measurements that are within engineering tolerance when used within the stated environmental conditions over some reasonable period of time. Having a design with these characteristics increases the likelihood of the measuring instruments performing as expected
37.
Climate
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Climate is the statistics of weather, usually over a 30-year interval. Climate differs from weather, in that weather only describes the conditions of these variables in a given region. A regions climate is generated by the system, which has five components, atmosphere, hydrosphere, cryosphere, lithosphere. The climate of a location is affected by its latitude, terrain, climates can be classified according to the average and the typical ranges of different variables, most commonly temperature and precipitation. The most commonly used classification scheme was the Köppen climate classification, the Bergeron and Spatial Synoptic Classification systems focus on the origin of air masses that define the climate of a region. Paleoclimatology is the study of ancient climates, Climate models are mathematical models of past, present and future climates. Climate change may occur long and short timescales from a variety of factors. For example, a 3°C change in mean annual temperature corresponds to a shift in isotherms of approximately 300–400 km in latitude or 500 m in elevation, therefore, species are expected to move upwards in elevation or towards the poles in latitude in response to shifting climate zones. Climate is commonly defined as the weather averaged over a long period, the standard averaging period is 30 years, but other periods may be used depending on the purpose. Climate also includes statistics other than the average, such as the magnitudes of day-to-day or year-to-year variations, the classical period is 30 years, as defined by the World Meteorological Organization. These quantities are most often surface variables such as temperature, precipitation, Climate in a wider sense is the state, including a statistical description, of the climate system. The World Meteorological Organization describes climate normals as reference points used by climatologists to compare current climatological trends to that of the past or what is considered normal, a Normal is defined as the arithmetic average of a climate element over a 30-year period. A30 year period is used, as it is enough to filter out any interannual variation or anomalies. The WMO originated from the International Meteorological Organization which set up a commission for climatology in 1929. At its 1934 Wiesbaden meeting the commission designated the thirty-year period from 1901 to 1930 as the reference time frame for climatological standard normals. In 1982 the WMO agreed to update climate normals, and in these were completed on the basis of climate data from 1 January 1961 to 31 December 1990. The difference between climate and weather is usefully summarized by the popular phrase Climate is what you expect, weather is what you get. Over historical time spans there are a number of nearly constant variables that determine climate, including latitude, altitude, proportion of land to water and these change only over periods of millions of years due to processes such as plate tectonics
38.
Latewood
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Wood is a porous and fibrous structural tissue found in the stems and roots of trees, and other woody plants. It is a material, a natural composite of cellulose fibers which are strong in tension embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, in a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots, Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber. In 2005, the stock of forests worldwide was about 434 billion cubic meters. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy, in 1991 approximately 3.5 billion cubic meters of wood were harvested. Dominant uses were for furniture and building construction, a 2011 discovery in the Canadian province of New Brunswick discovered the earliest known plants to have grown wood, approximately 395 to 400 million years ago. Wood can be dated by carbon dating and in species by dendrochronology to make inferences about when a wooden object was created. People have used wood for millennia for many purposes, primarily as a fuel or as a material for making houses, tools, weapons, furniture, packaging, artworks. Constructions using wood date back ten thousand years, buildings like the European Neolithic long house were made primarily of wood. Recent use of wood has changed by the addition of steel. The year-to-year variation in tree-ring widths and isotopic abundances gives clues to the climate at that time. This process is known as growth, it is the result of cell division in the vascular cambium, a lateral meristem. These cells then go on to form thickened secondary cell walls, composed mainly of cellulose, hemicellulose, if the distinctiveness between seasons is annual, these growth rings are referred to as annual rings. Where there is little seasonal difference growth rings are likely to be indistinct or absent, if the bark of the tree has been removed in a particular area, the rings will likely be deformed as the plant overgrows the scar. It is usually lighter in color than that near the portion of the ring. The outer portion formed later in the season is known as the latewood or summerwood. However, there are differences, depending on the kind of wood
39.
Early Netherlandish painting
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Their work follows the International Gothic style and begins approximately with Robert Campin and Jan van Eyck in the early 1420s. It lasts at least until the death of Gerard David in 1523, the major Netherlandish painters include Campin, van Eyck, Rogier van der Weyden, Dieric Bouts, Petrus Christus, Hans Memling, Hugo van der Goes and Hieronymus Bosch. These artists made significant advances in natural representation and illusionism, and their subjects are usually religious scenes or small portraits, with narrative painting or mythological subjects being relatively rare. Landscape is often richly described but relegated as a background detail before the early 16th century, the painted works are generally oil on panel, either as single works or more complex portable or fixed altarpieces in the form of diptychs, triptychs or polyptychs. The period is noted for its sculpture, tapestries, illuminated manuscripts, stained glass. Assisted by the system, panels and a variety of crafts were sold to foreign princes or merchants through private engagement or market stalls. A majority were destroyed during waves of iconoclasm in the 16th and 17th centuries, Early northern art in general was not well regarded from the early 17th to the mid-19th century, and the painters and their works were not well documented until the mid-19th century. Art historians spent almost another century determining attributions, studying iconography, attribution of some of the most significant works is still debated. These artists became a driving force behind the Northern Renaissance. In this political and art-historical context, the north follows the Burgundian lands which straddled areas that encompass parts of modern France, Germany, Belgium, the Netherlandish artists have been known by a variety of terms. Late Gothic is a designation which emphasises continuity with the art of the Middle Ages. In the early 20th century, the artists were variously referred to in English as the Ghent-Bruges school or the Old Netherlandish school. In this context, primitive does not refer to a lack of sophistication. When the Burgundian dukes established centres of power in the Netherlands, in the 19th century the Early Netherlandish artists were classified by nationality, with Jan van Eyck identified as German and van der Weyden as French. Scholars were at times preoccupied as to whether the schools genesis was in France or Germany, in the 14th century, as Gothic art gave way to the International Gothic era, a number of schools developed in northern Europe. Early Netherlandish art originated in French courtly art, and is tied to the tradition. Modern art historians see the era as beginning with 14th-century manuscript illuminators and this patronage continued in the low countries with the Burgundian dukes, Philip the Good and his son Charles the Bold. The demand for illuminated manuscripts declined towards the end of the century, following van Eycks innovations, the first generation of Netherlandish painters emphasised light and shadow, elements usually absent from 14th-century illuminated manuscripts
40.
Vistula
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The Vistula is the longest and largest river in Poland, at 1,047 kilometres in length. The drainage basin area of the Vistula is 194,424 km2, the remainder is in Belarus, Ukraine and Slovakia. The Vistula rises at Barania Góra in the south of Poland,1,220 meters above sea level in the Silesian Beskids, where it begins with the White Little Vistula and the Black Little Vistula. It empties into the Vistula Lagoon or directly into the Gdańsk Bay of the Baltic Sea with a delta, the name was first recorded by Pomponius Mela in AD40 and by Pliny in AD77 in his Natural History. Mela names the river Vistula, Pliny uses Vistla, the root of the name Vistula is Indo-European *u̯eis- to ooze, flow slowly and is found in many European rivernames. The diminutive endings -ila, -ula, were used in many Indo-European languages, in writing about the Vistula River and its peoples, Ptolemy uses the Greek spelling Ouistoula. Other ancient sources spell it Istula, ammianus Marcellinus refers to the Bisula, note the absence of the -t-. Jordanes uses Viscla, while the Anglo-Saxon poem Widsith refers to it as the Wistla, the Vistula river basin covers 194,424 square kilometres, its average altitude rising to 270 metres above sea level. In addition, the majority of its basin is located at heights of 100 to 200 m above sea level. The highest point of the basin lies at 2,655 metres. The asymmetry of the basin is 73–27%. The most recent glaciation of the Pleistocene epoch, which ended around 10,000 BC, is called the Vistulian glaciation or Weichselian glaciation in regard to north-central Europe. The river forms a delta called the Żuławy Wiślane around the town of Biała Góra near Sztum, about 50 km from the mouth. In the city of Gdańsk the Head of the Leniwka branch separates again into the Szkarpawa branch, the so-called Dead Wisła divides again into the Przegalinie branch flowing into Gdańsk Bay. Until the 14th century the Vistula was divided into an eastern branch, the Elbląg Vistula, and the smaller western branch. Since 1371 the Vistula of Gdańsk is the main artery. After the flood in 1840 an additional branch formed called the Śmiała Wisła, in 1890 through 1895, additional waterworks were carried out up the Świbna. The history of the River Vistula and her valley spans over 2 million years, the river is connected to the geological period called the Quaternary, in which distinct cooling of the climate took place
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