1.
Riga
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Riga is the capital and the largest city of Latvia. With 696,593 inhabitants, Riga is the largest city in the Baltic states, the city lies on the Gulf of Riga, at the mouth of the Daugava. Rigas territory covers 307.17 square kilometres and lies one and ten metres above sea level, on a flat and sandy plain. Riga was founded in 1201 and is a former Hanseatic League member, Rigas historical centre is a UNESCO World Heritage Site, noted for its Art Nouveau/Jugendstil architecture and 19th century wooden architecture. Riga was the European Capital of Culture during 2014, along with Umeå in Sweden, Riga hosted the 2006 NATO Summit, the Eurovision Song Contest 2003, and the 2006 IIHF Mens World Ice Hockey Championships. It is home to the European Unions office of European Regulators for Electronic Communications, Riga is served by Riga International Airport, the largest airport in the Baltic states. Riga is a member of Eurocities, the Union of the Baltic Cities, another theory could be that Riga was named after Riege, the German name for the River Rīdzene, a tributary of the Daugava. The river Daugava has been a trade route since antiquity, part of the Vikings Dvina-Dnieper navigation route to Byzantium. A sheltered natural harbour 15 km upriver from the mouth of the Daugava — the site of todays Riga — has been recorded, as Duna Urbs and it was settled by the Livs, an ancient Finnic tribe. Riga began to develop as a centre of Viking trade during the early Middle Ages, Rigas inhabitants occupied themselves mainly with fishing, animal husbandry, and trading, later developing crafts. German traders began visiting Riga, establishing a nearby outpost in 1158, along with German traders also arrived the monk Meinhard of Segeberg to convert the Livonian pagans to Christianity. Catholic and Orthodox Christianity had already arrived in Latvia more than a century earlier, Meinhard settled among the Livs, building a castle and church at Ikšķile, upstream from Riga, and established his bishopric there. The Livs, however, continued to practice paganism and Meinhard died in Ikšķile in 1196, in 1198, the Bishop Berthold arrived with a contingent of crusaders and commenced a campaign of forced Christianization. Berthold was killed soon afterwards and his forces defeated, pope Innocent III issued a bull declaring a crusade against the Livonians. Bishop Albert was proclaimed Bishop of Livonia by his uncle Hartwig of Uthlede, Prince-Archbishop of Bremen, Albert landed in Riga in 1200 with 23 ships and 500 Westphalian crusaders. In 1201, he transferred the seat of the Livonian bishopric from Ikšķile to Riga, the year 1201 also marked the first arrival of German merchants in Novgorod, via the Dvina. To defend territory and trade, Albert established the Order of Livonian Brothers of the Sword in 1202, open to nobles, in 1207, Albert started on fortification of the town. Emperor Philip invested Albert with Livonia as a fief and principality of the Holy Roman Empire, until then, it had been customary for crusaders to serve for a year and then return home
2.
Russian Empire
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The Russian Empire was a state that existed from 1721 until it was overthrown by the short-lived February Revolution in 1917. One of the largest empires in history, stretching over three continents, the Russian Empire was surpassed in landmass only by the British and Mongol empires. The rise of the Russian Empire happened in association with the decline of neighboring powers, the Swedish Empire, the Polish–Lithuanian Commonwealth, Persia. It played a role in 1812–14 in defeating Napoleons ambitions to control Europe. The House of Romanov ruled the Russian Empire from 1721 until 1762, and its German-descended cadet branch, with 125.6 million subjects registered by the 1897 census, it had the third-largest population in the world at the time, after Qing China and India. Like all empires, it included a large disparity in terms of economics, ethnicity, there were numerous dissident elements, who launched numerous rebellions and assassination attempts, they were closely watched by the secret police, with thousands exiled to Siberia. Economically, the empire had an agricultural base, with low productivity on large estates worked by serfs. The economy slowly industrialized with the help of foreign investments in railways, the land was ruled by a nobility from the 10th through the 17th centuries, and subsequently by an emperor. Tsar Ivan III laid the groundwork for the empire that later emerged and he tripled the territory of his state, ended the dominance of the Golden Horde, renovated the Moscow Kremlin, and laid the foundations of the Russian state. Tsar Peter the Great fought numerous wars and expanded an already huge empire into a major European power, Catherine the Great presided over a golden age. She expanded the state by conquest, colonization and diplomacy, continuing Peter the Greats policy of modernisation along West European lines, Tsar Alexander II promoted numerous reforms, most dramatically the emancipation of all 23 million serfs in 1861. His policy in Eastern Europe involved protecting the Orthodox Christians under the rule of the Ottoman Empire and that connection by 1914 led to Russias entry into the First World War on the side of France, Britain, and Serbia, against the German, Austrian and Ottoman empires. The Russian Empire functioned as a monarchy until the Revolution of 1905. The empire collapsed during the February Revolution of 1917, largely as a result of failures in its participation in the First World War. Perhaps the latter was done to make Europe recognize Russia as more of a European country, Poland was divided in the 1790-1815 era, with much of the land and population going to Russia. Most of the 19th century growth came from adding territory in Asia, Peter I the Great introduced autocracy in Russia and played a major role in introducing his country to the European state system. However, this vast land had a population of 14 million, grain yields trailed behind those of agriculture in the West, compelling nearly the entire population to farm. Only a small percentage lived in towns, the class of kholops, close to the one of slavery, remained a major institution in Russia until 1723, when Peter I converted household kholops into house serfs, thus including them in poll taxation
3.
Latvia
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Latvia, officially the Republic of Latvia, is a country in the Baltic region of Northern Europe, one of the three Baltic states. It is bordered by Estonia to the north, Lithuania to the south, Russia to the east, Latvia has 1,957,200 inhabitants and a territory of 64,589 km2. The country has a seasonal climate. Latvia is a parliamentary republic established in 1918. The capital city is Riga, the European Capital of Culture 2014, Latvia is a unitary state, divided into 119 administrative divisions, of which 110 are municipalities and 9 are cities. Latvians and Livs are the people of Latvia. Latvian and Lithuanian are the two surviving Baltic languages. Despite foreign rule from the 13th to 20th centuries, the Latvian nation maintained its identity throughout the generations via the language, Latvia and Estonia share a long common history. Until World War II, Latvia also had significant minorities of ethnic Germans, Latvia is historically predominantly Protestant Lutheran, except for the Latgale region in the southeast, which has historically been predominantly Roman Catholic. The Russian population has brought a significant portion of Eastern Orthodox Christians. The Republic of Latvia was founded on 18 November 1918, however, its de facto independence was interrupted at the outset of World War II. The peaceful Singing Revolution, starting in 1987, called for Baltic emancipation of Soviet rule and it ended with the Declaration on the Restoration of Independence of the Republic of Latvia on 4 May 1990, and restoring de facto independence on 21 August 1991. Latvia is a democratic and developed country and member of the European Union, NATO, the Council of Europe, the United Nations, CBSS, the IMF, NB8, NIB, OECD, OSCE, and WTO. For 2014, Latvia was listed 46th on the Human Development Index and it used the Latvian lats as its currency until it was replaced by the euro on 1 January 2014. The name Latvija is derived from the name of the ancient Latgalians, one of four Indo-European Baltic tribes, henry of Latvia coined the Latinisations of the countrys name, Lettigallia and Lethia, both derived from the Latgalians. The terms inspired the variations on the name in Romance languages from Letonia. Around 3000 BC, the ancestors of the Latvian people settled on the eastern coast of the Baltic Sea. The Balts established trade routes to Rome and Byzantium, trading local amber for precious metals, by 900 AD, four distinct Baltic tribes inhabited Latvia, Curonians, Latgalians, Selonians, Semigallians, as well as the Livonians speaking a Finnic language
4.
Leipzig
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Leipzig is the largest city in the federal state of Saxony, Germany. With a population of 570,087 inhabitants it is Germanys tenth most populous city, Leipzig is located about 160 kilometres southwest of Berlin at the confluence of the White Elster, Pleisse, and Parthe rivers at the southern end of the North German Plain. Leipzig has been a city since at least the time of the Holy Roman Empire. The city sits at the intersection of the Via Regia and Via Imperii, Leipzig was once one of the major European centers of learning and culture in fields such as music and publishing. Leipzig became an urban center within the German Democratic Republic after the Second World War. Leipzig later played a significant role in instigating the fall of communism in Eastern Europe, through events which took place in, Leipzig today is an economic center and the most livable city in Germany, according to the GfK marketing research institution. Since the opening of the Leipzig City Tunnel in 2013, Leipzig forms the centerpiece of the S-Bahn Mitteldeutschland public transit system, Leipzig is currently listed as Gamma World City and Germanys Boomtown. Outside of Leipzig the Neuseenland district forms a lake area of approximately 300 square kilometres. Leipzig is derived from the Slavic word Lipsk, which means settlement where the linden trees stand, an older spelling of the name in English is Leipsic. The Latin name Lipsia was also used, the name is cognate with Lipetsk in Russia and Liepāja in Latvia. In 1937 the Nazi government officially renamed the city Reichsmessestadt Leipzig, the common usage of this nickname for Leipzig up until the present is reflected, for example, in the name of a popular blog for local arts and culture, Heldenstadt. de. Leipzig was first documented in 1015 in the chronicles of Bishop Thietmar of Merseburg as urbs Libzi and endowed with city, Leipzig Trade Fair, started in the Middle Ages, became an event of international importance and is the oldest remaining trade fair in the world. During the Thirty Years War, two battles took place in Breitenfeld, about 8 kilometres outside Leipzig city walls, the first Battle of Breitenfeld took place in 1631 and the second in 1642. Both battles resulted in victories for the Swedish-led side, on 24 December 1701, an oil-fueled street lighting system was introduced. The city employed light guards who had to follow a schedule to ensure the punctual lighting of the 700 lanterns. The Leipzig region was the arena of the 1813 Battle of Leipzig between Napoleonic France and a coalition of Prussia, Russia, Austria and Sweden. It was the largest battle in Europe prior to the First World War, in 1913 the Monument to the Battle of the Nations celebrating the centenary of this event was completed. The railway station has two entrance halls, the eastern one for the Royal Saxon State Railways and the western one for the Prussian state railways
5.
Weimar Republic
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Weimar Republic is an unofficial, historical designation for the German state between 1919 and 1933. The name derives from the city of Weimar, where its constitutional assembly first took place, the official name of the state was still Deutsches Reich, it had remained unchanged since 1871. In English the country was known simply as Germany. A national assembly was convened in Weimar, where a new constitution for the Deutsches Reich was written, in its fourteen years, the Weimar Republic faced numerous problems, including hyperinflation, political extremism, and contentious relationships with the victors of the First World War. The people of Germany blamed the Weimar Republic rather than their leaders for the countrys defeat. However, the Weimar Republic government successfully reformed the currency, unified tax policies, Weimar Germany eliminated most of the requirements of the Treaty of Versailles, it never completely met its disarmament requirements, and eventually paid only a small portion of the war reparations. Under the Locarno Treaties, Germany accepted the borders of the republic. From 1930 onwards President Hindenburg used emergency powers to back Chancellors Heinrich Brüning, Franz von Papen, the Great Depression, exacerbated by Brünings policy of deflation, led to a surge in unemployment. In 1933, Hindenburg appointed Adolf Hitler as Chancellor with the Nazi Party being part of a coalition government, the Nazis held two out of the remaining ten cabinet seats. Von Papen as Vice Chancellor was intended to be the éminence grise who would keep Hitler under control, within months the Reichstag Fire Decree and the Enabling Act of 1933 had brought about a state of emergency, it wiped out constitutional governance and civil liberties. Hitlers seizure of power was permissive of government by decree without legislative participation and these events brought the republic to an end, as democracy collapsed, a single-party state founded the Nazi era. The Weimar Republic is so called because the assembly that adopted its constitution met at Weimar, Germany from 6 February 1919 to 11 August 1919, but this name only became mainstream after 1933. To the right of the spectrum the politically engaged rejected the new democratic model, the Catholic Centre party, Zentrum favoured the term Deutscher Volksstaat while on the moderate left the Chancellors SPD preferred Deutsche Republik. Only during the 1930s did the term become mainstream, both within and outside Germany, after the introduction of the republic, the flag and coat of arms of Germany were officially altered to reflect the political changes. The Weimar Republic retained the Reichsadler, but without the symbols of the former Monarchy and this left the black eagle with one head, facing to the right, with open wings but closed feathers, with a red beak, tongue and claws and white highlighting. If the Reichs Eagle is shown without a frame, the charge and colors as those of the eagle of the Reichs coat of arms are to be used. The patterns kept by the Federal Ministry of the Interior are decisive for the heraldic design, the artistic design may be varied for each special purpose. The achievements and signs of movement were mostly done away with after its downfall
6.
Kingdom of Prussia
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It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg, the kings of Prussia were from the House of Hohenzollern. Prussia was a power from the time it became a kingdom, through its predecessor, Brandenburg-Prussia. Prussia continued its rise to power under the guidance of Frederick II, more known as Frederick the Great. After the might of Prussia was revealed it was considered as a power among the German states. Throughout the next hundred years Prussia went on to win many battles and it was because of its power that Prussia continuously tried to unify all the German states under its rule. Attempts at creation of a federation remained unsuccessful and the German Confederation collapsed in 1866 when war ensued between its two most powerful states, Prussia and Austria. The North German Confederation which lasted from 1867–1871, created a union between the Prussian-aligned states while Austria and most of Southern Germany remained independent. The North German Confederation was seen as more of an alliance of military strength in the aftermath of the Austro-Prussian War, the German Empire lasted from 1871–1918 with the successful unification of all the German states under Prussian hegemony. This was due to the defeat of Napoleon III in the Franco-Prussian War of 1870–71, in 1871, Germany unified into a single country, minus Austria and Switzerland, with Prussia the dominant power. Prussia is considered the predecessor of the unified German Reich. The Kingdom left a significant cultural legacy, today notably promoted by the Prussian Cultural Heritage Foundation, in 1415 a Hohenzollern Burgrave came from the south to the March of Brandenburg and took control of the area as elector. In 1417 the Hohenzollern was made an elector of the Holy Roman Empire, after the Polish wars, the newly established Baltic towns of the German states including Prussia, suffered many economic setbacks. Many of the Prussian towns could not even afford to attend political meetings outside of Prussia, the towns were poverty stricken, with even the largest town, Danzig, having to borrow money from elsewhere to pay for trade. Poverty in these towns was partly caused by Prussias neighbors, who had established and developed such a monopoly on trading that these new towns simply could not compete and these issues led to feuds, wars, trade competition and invasions. However, the fall of these gave rise to the nobility, separated the east and the west. It was clear in 1440 how different Brandenburg was from the other German territories, not only did it face partition from within but also the threat of its neighbors. It prevented the issue of partition by enacting the Dispositio Achillea which instilled the principle of primogeniture to both the Brandenburg and Franconian territories, the second issue was solved through expansion
7.
German Empire
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The German Empire was the historical German nation state that existed from the unification of Germany in 1871 to the abdication of Kaiser Wilhelm II in 1918, when Germany became a federal republic. The German Empire consisted of 26 constituent territories, with most being ruled by royal families and this included four kingdoms, six grand duchies, five duchies, seven principalities, three free Hanseatic cities, and one imperial territory. Although Prussia became one of kingdoms in the new realm, it contained most of its population and territory. Its influence also helped define modern German culture, after 1850, the states of Germany had rapidly become industrialized, with particular strengths in coal, iron, chemicals, and railways. In 1871, it had a population of 41 million people, and by 1913, a heavily rural collection of states in 1815, now united Germany became predominantly urban. During its 47 years of existence, the German Empire operated as an industrial, technological, Germany became a great power, boasting a rapidly growing rail network, the worlds strongest army, and a fast-growing industrial base. In less than a decade, its navy became second only to Britains Royal Navy, after the removal of Chancellor Otto von Bismarck by Wilhelm II, the Empire embarked on a bellicose new course that ultimately led to World War I. When the great crisis of 1914 arrived, the German Empire had two allies, Italy and the Austro-Hungarian Empire, Italy, however, left the once the First World War started in August 1914. In the First World War, German plans to capture Paris quickly in autumn 1914 failed, the Allied naval blockade caused severe shortages of food. Germany was repeatedly forced to send troops to bolster Austria and Turkey on other fronts, however, Germany had great success on the Eastern Front, it occupied large Eastern territories following the Treaty of Brest-Litovsk. German declaration of unrestricted submarine warfare in early 1917 was designed to strangle the British, it failed, but the declaration—along with the Zimmermann Telegram—did bring the United States into the war. Meanwhile, German civilians and soldiers had become war-weary and radicalised by the Russian Revolution and this failed, and by October the armies were in retreat, Austria-Hungary and the Ottoman Empire had collapsed, Bulgaria had surrendered and the German people had lost faith in their political system. The Empire collapsed in the November 1918 Revolution as the Emperor and all the ruling monarchs abdicated, and a republic took over. The German Confederation had been created by an act of the Congress of Vienna on 8 June 1815 as a result of the Napoleonic Wars, German nationalism rapidly shifted from its liberal and democratic character in 1848, called Pan-Germanism, to Prussian prime minister Otto von Bismarcks pragmatic Realpolitik. He envisioned a conservative, Prussian-dominated Germany, the war resulted in the Confederation being partially replaced by a North German Confederation in 1867, comprising the 22 states north of the Main. The new constitution and the title Emperor came into effect on 1 January 1871, during the Siege of Paris on 18 January 1871, William accepted to be proclaimed Emperor in the Hall of Mirrors at the Palace of Versailles. The second German Constitution was adopted by the Reichstag on 14 April 1871 and proclaimed by the Emperor on 16 April, the political system remained the same. The empire had a parliament called the Reichstag, which was elected by universal male suffrage, however, the original constituencies drawn in 1871 were never redrawn to reflect the growth of urban areas
8.
University of Tartu
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The University of Tartu is a classical university in the city of Tartu, Estonia. It is the university of Estonia. The University of Tartu is the only university in the country. It was established by King Gustavus Adolphus of Sweden in 1632, there are nearly 14,000 students at the university, of which over 1,300 are foreign students. The QS World University Rankings ranked the University of Tartu 347th in the world in 2016, the university is also ranked 4th in the Emerging Europe and Central Asia region. The Times Higher Education World University Rankings placed it in the 301–350 range among world universities and it is the only university in the Baltic countries to place among the top 200 universities in Europe. UT belongs to top 1% of worlds most cited universities in 10 research areas, the historical buildings of the university are included in the European Heritage Label list as embodiment of the ideas of a university in the Age of Enlightenment. The University of Tartu is a member of the Coimbra Group, the Academia Gustaviana in the then Swedish province of Livonia was the second university founded in the Swedish Empire, following Uppsala University and preceding the Academy of Åbo. A precursor to the academy had been a Jesuit grammar school Gymnasium Dorpatense, founded by Stefan Batory in 1583 and existing to 1601, the first students immatriculated between 20–21 April 1632. The opening ceremony of Academia Dorpatensis took place on 15 October in the same year, the academy in Tartu functioned with Philosophy, Law, Theology and Medical Faculties enjoying the privileges of the University of Uppsala. On account of the Russian–Swedish war, the University of Tartu moved to Tallinn in 1656, in the 17th century the future outstanding Swedish scholars Urban Hiärne, Olof Verelius, Arvid Moller and others studied at the university. In 1690 Tartu became a university town again, Academia Gustavo-Carolina shortly after that moved from Tartu to Pärnu as a result of the coalition against Sweden and the Great Famine of 1695–1697. Academia Gustavo-Carolina, which had opened in Pärnu on 28 August 1699 was closed because of the surrender to Russian forces on 12 August 1710 during the Great Northern War, according to the terms of the capitulation, the Russians agreed to maintain the university in Pärnu. The university was re-opened by the Baltic Germans in Estonia in April 1802, the language of instruction at Dorpat was German from 1802 to 1893. During that time, Dorpat had a nature in that it belonged both to the set of German and Russian universities. Financially and administratively, the latter was important, intellectually and regarding the professoriate and students. Among the 30 German-language universities, of which 23 were inside the German Empire, in teaching, the university educated the local Baltic German leadership and professional classes as well as staff especially for the administration and health system of the entire Russian Empire. In scholarship, it was a university, the time between 1860 and 1880 was its golden age
9.
HSL and HSV
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HSL and HSV are the two most common cylindrical-coordinate representations of points in an RGB color model. The two representations rearrange the geometry of RGB in an attempt to be intuitive and perceptually relevant than the cartesian representation. Developed in the 1970s for computer applications, HSL and HSV are used today in color pickers, in image editing software. HSL stands for hue, saturation, and lightness, and is often called HLS. HSV stands for hue, saturation, and value, and is often called HSB. A third model, common in computer applications, is HSI. However, while typically consistent, these definitions are not standardized, note that while hue in HSL and HSV refers to the same attribute, their definitions of saturation differ dramatically. As a result, each unique RGB device has unique HSL and HSV absolute color spaces to accompany it, other more computationally intensive models, such as CIELAB or CIECAM02, are said to better achieve these goals. In each geometry, the vertical axis comprises the neutral, achromatic, or gray colors, ranging from black at lightness 0 or value 0, the bottom, to white at lightness 1 or value 1. These saturated colors have lightness ½ in HSL, while in HSV they have value 1, mixing these pure colors with black—producing so-called shades—leaves saturation unchanged. In HSL, saturation is also unchanged by tinting with white, in HSV, tinting alone reduces saturation. Confusingly, such diagrams usually label this radial dimension saturation, blurring or erasing the distinction between saturation and chroma, as described below, computing chroma is a helpful step in the derivation of each model. Most televisions, computer displays, and projectors produce colors by combining red, green, furthermore, neither additive nor subtractive color models define color relationships the same way the human eye does. For example, imagine we have an RGB display whose color is controlled by three sliders ranging from 0–255, one controlling the intensity of each of the red, green, consequently, these models and similar ones have become ubiquitous throughout image editing and graphics software since then. Some of their uses are described below, nonetheless, it is worth reviewing those definitions before leaping into the derivation of our models. Hue The attribute of a visual sensation according to which an area appears to be similar to one of the colors, red, yellow, green. Radiance The radiant power of passing through a particular surface per unit solid angle per unit projected area. Luminance The radiance weighted by the effect of each wavelength on a human observer
10.
Liesegang rings (geology)
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Liesegang rings are colored bands of cement observed in sedimentary rocks that typically cut-across bedding. These secondary sedimentary structures exhibit bands of minerals that are arranged in a repeating pattern. Liesegang rings are distinguishable from other structures by their concentric or ring-like appearance. The resultant precipitate of silver dichromate formed a pattern of rings. Liesegang and successive other workers observed the behavior of precipitates forming rings in sedimentary rocks, the process by which Liesegang rings develop is not completely understood. Liesegang rings may form from the segregation of iron oxides. In this process the. diffusion of reactants leads to supersaturation and nucleation, one classic example based on the Ostwald-Liesegang hypothesis is observed in water and rock interactions where iron hydroxide precipitates in sandstone through pore space. Liesegang ring patterns are considered to be secondary sedimentary structures, though they are found in permeable igneous. Chemical weathering of rocks that leads to the formation of Liesegang rings typically involves the diffusion of oxygen in water into pore space containing soluble ferrous iron. Liesegang rings usually cut across layers of stratification and occur in many types of rock, some of more commonly include sandstone. Though there is an occurrence of Liesegang rings in sedimentary rocks, relatively few scientists have studied their mineralogy. Pseudofaults are the result of Liesegang rings developing within areas of the rock that are adjacent to each other but at varying stratigraphic levels
11.
Pipette
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A pipette is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, often as a media dispenser. Pipettes come in designs for various purposes with differing levels of accuracy and precision. Many pipette types work by creating a vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw up. Measurement accuracy varies greatly depending on the style, the first simple pipettes were made in glass, such as Pasteur pipettes. Large pipettes continue to be made in glass, others are made in plastic for situations where an exact volume is not required. The first micropipette was patented in 1957 by Dr Heinrich Schnitger, the founder of the company Eppendorf, Dr. Heinrich Netheler, inherited the rights and started the commercial production of micropipettes in 1961. Although specific descriptive names exist for each type of pipette, in any type of pipette will merely be referred to as a pipette. Sometimes, pipettes that dispense between 1 and 1000 μl are distinguished as micropipettes, while macropipettes dispense greater volumes. Air displacement micropipettes are a type of adjustable micropipette that deliver a measured volume of liquid, depending on size and these pipettes require disposable tips that come in contact with the fluid. The four standard sizes of micropipettes correspond to four different disposable tip colors, a vacuum is generated by the vertical travel of a metal or ceramic piston within an airtight sleeve. As the piston upward, driven by the depression of the plunger. The liquid around the tip moves into this vacuum and can then be transported and released as necessary and these pipettes are capable of being very precise and accurate. However, since they rely on air displacement, they are subject to inaccuracies caused by the environment, particularly temperature. For these reasons this equipment must be maintained and calibrated. The micropipette was invented and patented in 1960 by Dr. Heinrich Schnitger Marburg, afterwards, the co-founder of the biotechnology company Eppendorf, Dr. Heinrich Netheler, inherited the rights and initiated the global and general use of micropipettes in labs. In 1972, the micropipette was invented at the University of Wisconsin-Madison by several people, primarily Warren Gilson. Companies in the drug or food industries are required to calibrate their pipettes quarterly, schools which are conducting chemistry classes can have this process annually. Those studying forensics and research where a deal of testing is commonplace will perform monthly calibrations
12.
Chemistry
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Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter. Chemistry is sometimes called the science because it bridges other natural sciences, including physics. For the differences between chemistry and physics see comparison of chemistry and physics, the history of chemistry can be traced to alchemy, which had been practiced for several millennia in various parts of the world. The word chemistry comes from alchemy, which referred to a set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism. An alchemist was called a chemist in popular speech, and later the suffix -ry was added to this to describe the art of the chemist as chemistry, the modern word alchemy in turn is derived from the Arabic word al-kīmīā. In origin, the term is borrowed from the Greek χημία or χημεία and this may have Egyptian origins since al-kīmīā is derived from the Greek χημία, which is in turn derived from the word Chemi or Kimi, which is the ancient name of Egypt in Egyptian. Alternately, al-kīmīā may derive from χημεία, meaning cast together, in retrospect, the definition of chemistry has changed over time, as new discoveries and theories add to the functionality of the science. The term chymistry, in the view of noted scientist Robert Boyle in 1661, in 1837, Jean-Baptiste Dumas considered the word chemistry to refer to the science concerned with the laws and effects of molecular forces. More recently, in 1998, Professor Raymond Chang broadened the definition of chemistry to mean the study of matter, early civilizations, such as the Egyptians Babylonians, Indians amassed practical knowledge concerning the arts of metallurgy, pottery and dyes, but didnt develop a systematic theory. Greek atomism dates back to 440 BC, arising in works by such as Democritus and Epicurus. In 50 BC, the Roman philosopher Lucretius expanded upon the theory in his book De rerum natura, unlike modern concepts of science, Greek atomism was purely philosophical in nature, with little concern for empirical observations and no concern for chemical experiments. Work, particularly the development of distillation, continued in the early Byzantine period with the most famous practitioner being the 4th century Greek-Egyptian Zosimos of Panopolis. He formulated Boyles law, rejected the four elements and proposed a mechanistic alternative of atoms. Before his work, though, many important discoveries had been made, the Scottish chemist Joseph Black and the Dutchman J. B. English scientist John Dalton proposed the theory of atoms, that all substances are composed of indivisible atoms of matter. Davy discovered nine new elements including the alkali metals by extracting them from their oxides with electric current, british William Prout first proposed ordering all the elements by their atomic weight as all atoms had a weight that was an exact multiple of the atomic weight of hydrogen. The inert gases, later called the noble gases were discovered by William Ramsay in collaboration with Lord Rayleigh at the end of the century, thereby filling in the basic structure of the table. Organic chemistry was developed by Justus von Liebig and others, following Friedrich Wöhlers synthesis of urea which proved that organisms were, in theory
Kingdom of Prussia
German Empire (after 1871)
