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Aleksandar Zega
Aleksandar Zega (29 May 1860 – 29 March 1928) was a Serbian chemist. He held professional positions in the Government, Municipal and Customs Laboratories, and made a number of applied and theoretical contributions. He dealt with analytical and organic chemistry, specifically the analysis of mineral waters and foodstuffs. He studied and worked in Switzerland, however he wrote and published most of his works during his work and stay in Serbia. He was a contemporary of Milorad Z. Jovičić (1868–1937) and Wladimir Brunetti. Biography Zega was born on 29 May 1860 in Novo Selo to landowners Jelena and Kosta Zega. He finished primary school in his hometown and attended high school in Pančevo. He attended universities in Vienna and Zürich, graduating from the latter in 1879. He was awarded a canton of Zürich scholarship, which enabled him to continue his chemistry studies at the ETHZ and the University of Zurich along with other chemists Viktor Meyer and Georg Lunge. After passing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemist
A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field. Chemists study the composition of matter and its properties. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms. Chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties. In Commonwealth English, pharmacists are often called chemists. Chemists use their knowledge to learn the composition and properties of unfamiliar substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and create new artificial substances and useful processes. Chemists may specialize in any number of Chemistry#Subdisciplines, subdisciplines of chemistry. Materials science, Materials scientists and metallurgists sha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wuppertal
Wuppertal (; ) is a city in North Rhine-Westphalia, in western Germany, with a population of 355,000. Wuppertal is the seventh-largest city in North Rhine-Westphalia and List of cities in Germany by population, 17th-largest in Germany. It was founded in 1929 by the merger of Elberfeld, Barmen, Ronsdorf, Cronenberg, Wuppertal, Cronenberg and Vohwinkel Schwebebahn, Vohwinkel, and was initially called "Barmen-Elberfeld" before adopting its present name in 1930. It is the capital and largest city of the Bergisches Land. The city straddles the densely populated banks of the River Wupper, a tributary of the Rhine. Wuppertal is located between the Ruhr (Essen) to the north, Düsseldorf to the west, and Cologne to the southwest, and over time has grown together with Solingen, Remscheid and Hagen. The stretching of the city in a long band along the narrow Wupper Valley leads to a spatial impression of Wuppertal being larger than it actually is. The city is known for its steep slope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Makiš
Makiš () is a forest and an urban neighborhood of Belgrade, the capital of Serbia. It is located in Belgrade's municipality of Čukarica. Location Makiš is bordered by the Sava river and Sava Lake to the west and north, Čukarica and Čukarička Padina to the northeast, Julino Brdo, Žarkovo, Bele Vode and Rupčine to the east, Železnik to the south and Ostružnica to the southwest. Geography For the most part, Makiš is a marshy forest, crossed by many small streams and canals, most notably the ''Marevica''. Northern part is known as ''Jedek'', western as ''Aščinica'' and central as ''Veliko Okno''. Part of the Sava's alluvial plane, the main section of the area, which covers several hundreds of hectares, is covered with gravel and sand which are 10,000 years old. In time, a plentiful water source formed. As the Sava river reaches the bend at Makiš, some water continues in the straight direction, penetrating the ground in the fan-shaped manner, without reaching th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ćuprija
Ćuprija (Serbian Cyrillic: Ћуприја, ) is a town and municipality located in the Pomoravlje District of central Serbia. The population of the town is 16,522, while the municipality has 25,325 inhabitants (2022 census). History The Romans founded the town as a fort Horreum Margi (Horreum: ''Granary'', Margi: '' Morava'') on the road from Constantinople to Rome, where it crosses the river now known as Velika Morava. It served as a Roman military base, had a shield factory and gained the status of ''municipium'' before AD 224. In 505, the Romans were defeated by Goths and Huns under Mundo, a descendant of Attila the Hun. Under Slavic rule, it became known as Ravno (literal translation to English would be "flat"), since it is in a flat river valley. Some local names (of the villages Paljane and Isakovo, of the river Mirosava) recall the major clash in autumn 1191 between the Serbs (under Stefan Nemanja) and the Byzantines (under Emperor Isaac II Angelos). In the 15th cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Well Water
A well is an excavation or structure created on the earth by digging, driving, or drilling to access liquid resources, usually water. The oldest and most common kind of well is a water well, to access groundwater in underground aquifers. The well water is drawn up by a pump, or using containers, such as buckets that are raised mechanically or by hand. Water can also be injected back into the aquifer through the well. Wells were first constructed at least eight thousand years ago and historically vary in construction from a sediment of a dry watercourse to the qanats of Iran, and the stepwells and sakiehs of India. Placing a lining in the well shaft helps create stability, and linings of wood or wickerwork date back at least as far as the Iron Age. Wells have traditionally been sunk by hand digging, as is still the case in rural areas of the developing world. These wells are inexpensive and low-tech as they use mostly manual labour, and the structure can be lined with bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting took place mainly in European theatre of World War I, Europe and the Middle Eastern theatre of World War I, Middle East, as well as in parts of African theatre of World War I, Africa and the Asian and Pacific theatre of World War I, Asia-Pacific, and in Europe was characterised by trench warfare; the widespread use of Artillery of World War I, artillery, machine guns, and Chemical weapons in World War I, chemical weapons (gas); and the introductions of Tanks in World War I, tanks and Aviation in World War I, aircraft. World War I was one of the List of wars by death toll, deadliest conflicts in history, resulting in an estimated World War I casualties, 10 million military dead and more than 20 million wounded, plus some 10 million civilian de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orcinol
Orcinol is an organic compound with the formula CH3C6H3(OH)2. It occurs in many species of lichens including ''Roccella tinctoria'' and ''Lecanora''. Orcinol has been detected in the "toxic glue" of the ant species ''Camponotus saundersi''. It is a colorless solid. It is related to resorcinol, 1,3-C6H4(OH)2. Synthesis and reactions Orcinol was first prepared by dehydroacetic acid, a conversion that involved ring-opening of the pyrone to a triketone. This early experiment helped establish the rich condensation chemistry of polyketides. It can be obtained by fusing extract of aloes with potash, followed by acidification. It undergoes ''O''-methylation with dimethylsulfate. It is used in the production of the dye orcein and as a reagent in some chemical tests for pentoses, such as Bial's Test. It may be synthesized from toluene; more interesting is its production when acetone dicarboxylic ester is condensed with the aid of sodium. It crystallizes in colorless prisms with one m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sava
The Sava, is a river in Central Europe, Central and Southeast Europe, a right-bank and the longest tributary of the Danube. From its source in Slovenia it flows through Croatia and along its border with Bosnia and Herzegovina, and finally reaches Serbia, feeding into the Danube in its capital, Belgrade. The Sava is long, including the Sava Dolinka headwater rising in Zelenci, Slovenia. It is the largest List of tributaries of the Danube, tributary of the Danube by volume of water, and the second-largest after the Tisza in terms of catchment area () and length. It drains a significant portion of the Dinaric Alps region, through the major tributaries of Drina, Bosna (river), Bosna, Kupa, Una (Sava), Una, Vrbas (river), Vrbas, Lonja, Kolubara, Bosut (river), Bosut and Krka (Sava), Krka. The Sava is one of the longest rivers in Europe and among the longest tributaries of another river. The population in the Sava River basin is estimated at 8,176,000, and is shared by three capit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marko Leko
Marko T. Leko ( sr-Cyrl, Марко Т. Леко; September 17, 1853 – November 4, 1932) was a Serbian scientist, chemist, professor and president of the Serbian Red Cross. He played a major role in the professionalisation of chemistry in Serbia. Leko was born in Belgrade, Serbia, on September 17, 1853, to a merchant family. He attended and graduated from Polytechnic School in Zurich and obtained his doctoral degree in 1875. For a short period, he was employed in Hoffman's laboratory. Career He has 52 publications mostly in the areas of organic and analytical chemistry. Thanks to work he dedicated in writing his doctoral dissertation and the number of works that followed, he was able to solve one of the most sought problems of the time: does ammonium chloride and its closely related compounds belong to compounds of five valences nitrogen, N H4 Cl, or to compounds such as NH3·HCl. His work in analytical chemistry had two main interests: researching natural resources of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grandes écoles
Grandes may refer to: *Agustín Muñoz Grandes, Spanish general and politician * Banksia ser. Grandes, a series of plant species native to Australia * Grandes y San Martín, a municipality located in the province of Ávila, Castile and León, Spain *Grandes (islands) Grandes () is a group of three small islands off the east coast of Crete. Administratively it comes within the Itanos municipality in Lasithi. Grandes can be seen from the Minoan site of Roussolakkos near Palekastro as can the island of E ..., a group of three small islands in the Aegean Sea off the east coast of Crete * ''Grandes'' (album), by Maná {{disambig, geo, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pirot
Pirot ( sr-Cyrl, Пирот) is a city and the administrative center of the Pirot District in southeastern Serbia. According to 2022 census, the urban area of the city has a population of 34,942, while the population of the city administrative area has 49,601 inhabitants. The city has rich geographical features, including the mountains of Stara Planina, Vlaška Planina, Belava, Suva Planina; rivers which flow through the town, including Nišava, Jerma, Rasnička Reka, Temštica and the Visočica; and four lakes, the Zavoj Lake, Berovacko Lake, Krupac Lake and Sukovo Lake. It also has a rich culture, with notable Orthodox church buildings, including the Church of St. Petka, and the monastery of St. Georges and St. John the Theologian from the late 14th century, both of which display an example of medieval architecture. Pirot is known for its traditional woven carpet, the Pirot carpet (''Pirot ćilim''). Geography The municipality of Pirot covers an area of , with over sev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctorate
A doctorate (from Latin ''doctor'', meaning "teacher") or doctoral degree is a postgraduate academic degree awarded by universities and some other educational institutions, derived from the ancient formalism '' licentia docendi'' ("licence to teach"). In most countries, a research degree qualifies the holder to teach at university level in the degree's field or work in a specific profession. There are a number of doctoral degrees; the most common is the Doctor of Philosophy (PhD), awarded in many different fields, ranging from the humanities to scientific disciplines. Many universities also award honorary doctorates to individuals deemed worthy of special recognition, either for scholarly work or other contributions to the university or society. History Middle Ages The term ''doctor'' derives from Latin, meaning "teacher" or "instructor". The doctorate (Latin: ''doctoratus'') appeared in medieval Europe as a license to teach Latin (''licentia docendi'') at a university. Its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
