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Vojtěch Šafařík
Vojtěch Šafařík (26 October 1829 in Újvidék, Bács-Bodrog County, Vojvodina, Kingdom of Hungary (1526–1867), Hungary (today Serbia) – 2 July 1902 in Prague, Bohemia) was a Czech chemist, specialising in inorganic chemistry. Šafařík was the son of Pavel Jozef Šafárik, a Slovaks, Slovak Philology, philologist and historian. The crater Šafařík (crater), Šafařík on the Moon is named after him, and so is the minor planet 8336 Šafařík (in conjunction with his wife). Work In Göttingen, he was involved in the investigation of the reaction of metals with Organoiodine compound, alkyl iodides and produced diethylmagnesium. He also worked on the chemical composition of platinum and vanadium catalysts, and on Organometallic chemistry, organometallic compounds (Grignard reaction, Grignard compounds). At the Imperial Academy of Sciences in Vienna, Vienna Academy he published a work on physical chemistry. He also studied mineralogy. In 1859, together with fellow chemis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organoiodine Compound
Organoiodine chemistry is the study of the synthesis and properties of organoiodine compounds, or organoiodides, organic compounds that contain one or more carbon–iodine bonds. They occur widely in organic chemistry, but are relatively rare in nature. The thyroxine hormones are organoiodine compounds that are required for health and the reason for government-mandated iodization of salt. Structure, bonding, general properties Almost all organoiodine compounds feature iodide connected to one carbon center. These are usually classified as derivatives of I−. Some organoiodine compounds feature iodine in higher oxidation states. The C–I bond is the weakest of the carbon–halogen bonds. These bond strengths correlate with the electronegativity of the halogen, decreasing in the order F > Cl > Br > I. This periodic order also follows the atomic radius of halogens and the length of the carbon-halogen bond. For example, in the molecules represented by CH3X, where X ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adalbert Of Prague
Adalbert of Prague (, , , , ; 95623 April 997), known in the Czech Republic, Poland and Slovakia by his birth name Vojtěch (), was a Czech missionary and Christian saint. He was the Bishop of Prague and a missionary to the Hungarians, Poles, and Prussians, who was martyred in his efforts to convert the Baltic Prussians to Christianity. He is said to be the composer of the oldest Czech hymn '' Hospodine, pomiluj ny'' and '' Bogurodzica'', the oldest known Polish anthem but his authorship of them has not been confirmed. Adalbert was later declared the patron saint of the Czech Republic, Poland, and the Duchy of Prussia. He is also the patron saint of the Archdiocese of Esztergom in Hungary. Life Early years Born as ''Vojtěch'' in 952 or in gord Libice, he belonged to the Slavnik clan, one of the two most powerful families in Bohemia. Events from his life were later recorded by a Bohemian priest Cosmas of Prague (1045–1125). Vojtěch's father was Slavník (d. 978–981 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes systematically with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: * ''Intrinsic variables'', whose luminosity actually changes periodically; for example, because the star swells and shrinks. * ''Extrinsic variables'', whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it. Many, possibly most, stars exhibit at least some oscillation in luminosity: the energy output of the Sun, for example, varies by about 0.1% over an 11-year solar cycle. Discovery An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago may be the oldest preserved historical document of the discovery of a variable star, the eclipsing binary Algol. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles University
Charles University (CUNI; , UK; ; ), or historically as the University of Prague (), is the largest university in the Czech Republic. It is one of the List of oldest universities in continuous operation, oldest universities in the world in continuous operation, the oldest university north of the Alps and east of University of Paris, Paris. Today, the university consists of 17 faculties located in Prague, Hradec Králové, and Plzeň. History Medieval university (1349–1419) The establishment of a medieval university in Prague was inspired by Holy Roman Emperor Charles IV, Holy Roman Emperor, Charles IV. He requested his friend and ally, Pope Clement VI, to create the university. On 26 January 1347, the pope issued the bull establishing a university in Prague, modeled on the University of Paris, with all four faculty (division), faculties, including theology. On 7 April 1348 Charles, the king of Bohemia, gave to the established university privileges and immunities from the se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Josef Jungmann
Josef Jungmann (16 July 1773 – 14 November 1847) was a Czech linguist and poet, and a leading figure of the Czech National Revival. Together with Josef Dobrovský, he is considered to be a creator of the modern Czech language. The literary award for the best translation into Czech is named after him. Life Josef Jungmann was born on 16 July 1773 in Hudlice near Beroun. He was the sixth child (out of ten) of a cobbler. His father was of Bohemian German descent and his mother was of Czech descent. The children grew up speaking both languages at home, which contributed heavily to Jungmann's later role as a revivalist of the Czech language. In his youth, he wanted to become a priest. After he completed grammar school in 1788-1792 however, he went on to study Philosophy and Law. Beginning in 1799, he started teaching at the local high school in Litoměřice (today known as Josef Jungmann Gymnasium), which had a German majority at that time. In 1815, he moved to Prague, where he wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jan Svatopluk Presl
Jan Svatopluk Presl (4 September 1791 – 6 April 1849) was a Czech natural scientist. He was the brother of botanist Carl Borivoj Presl (1794–1852). The Czech Botanical Society commemorated the two brothers by naming its principal publication ''Preslia'' (founded in 1914). He is the author of Czech scientific terminology of various branches of science, including the Czech chemical nomenclature. He was the co-author of an important Czech taxonomic work, '' O Přirozenosti Rostlin''. The brothers co-edited the exsiccata series ''Vegetabilia cryptogamica Boëmiae collecta a Joanne et Carolo Presl''. Selected publications * * See also * Carl Borivoj Presl Carl Borivoj Presl (; 17 February 1794 – 2 October 1852) was a Czech botanist. Biography Presl lived his entire life in Prague, and was a professor of botany at the University of Prague (1833–52). [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prussian Blue
Prussian blue (also known as Berlin blue, Brandenburg blue, Parisian and Paris blue) is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula . It consists of cations, where iron is in the oxidation state of +3, and anions, where iron is in the oxidation state of +2, so, the other name of this salt is iron(III) hexacyanoferrate(II). Turnbull's blue is essentially identical chemically, excepting that it has different impurities and particle sizes—because it is made from different reagents—and thus it has a slightly different color. Prussian blue was created in the early 18th century and is the first modern chemical synthesis, synthetic pigment. It is prepared as a very fine colloidal dispersion, because the compound is not soluble in water. It contains variable amounts of other ions and its appearance depends sensitively on the size of the colloidal particles. The pigment is used in paints, it became prominent in 19th-century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manuscripts Of Dvůr Králové And Of Zelená Hora
A manuscript (abbreviated MS for singular and MSS for plural) was, traditionally, any document written by hand or typewritten, as opposed to mechanically printed or reproduced in some indirect or automated way. More recently, the term has come to be understood to further include ''any'' written, typed, or word-processed copy of an author's work, as distinguished from the rendition as a printed version of the same. Before the arrival of prints, all documents and books were manuscripts. Manuscripts are not defined by their contents, which may combine writing with mathematical calculations, maps, music notation, explanatory figures, or illustrations. Terminology The word "manuscript" derives from the (from , hand and from , to write), and is first recorded in English in 1597. An earlier term in English that shares the meaning of a handwritten document is "hand-writ" (or "handwrit"), which is first attested around 1175 and is now rarely used. The study of the writing (the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antonín Bělohoubek
Antonin, Antonín, and Antoñín are masculine given names. Antonín, a Czech name in use in the Czech Republic, and Antonin, a French name in use in France, and French-speaking countries, are both considered alternate forms of Antonino. Antoñín, a Spanish name in use in Spain and Spanish-speaking countries, is a diminutive form of Antonio. As a surname it is derived from the Antonius root name. Notable people with these names include: Given name: Antonin *Antonin Artaud (1896–1948), French theatre director, writer, actor, and artist * Antonin Bajewski (1915–1941), Polish Franciscan friar * Antonin Baudry (born 1975), French diplomat * Antonin Berruyer (born 1998), French rugby union player *Antonin Berval (1891–1966), French film actor * Antonin Besse (1877–1951), French businessman * Antonin Bobichon (born 1995), French footballer *Antonin Brémond (died 1755), French Master of the Order of Preachers *Antonin Carlès (1851–1919), French sculptor *Antonin Cloche (1628 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Imperial Academy Of Sciences In Vienna
The Austrian Academy of Sciences (; ÖAW) is a legal entity under the special protection of the Republic of Austria. According to the statutes of the Academy its mission is to promote the sciences and humanities in every respect and in every field, particularly in fundamental research. History In 1713, Gottfried Wilhelm Leibniz suggested to establish an Academy, inspired by the Royal Society and the French Academy of Sciences. The "Kaiserliche Akademie der Wissenschaften in Wien" was finally established by Imperial Patent on 14 May 1847. The academy soon began extensive research. In the humanities the academy started with researching and publishing important historical sources of Austria. Research in natural science also covered a wide variety of topics. The 1921 federal law guaranteed the legal basis of the academy in the newly founded First Austrian Republic. From the mid-1960s onwards it became the country's leading institution in the field of non-university basic research. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grignard Reaction
The Grignard reaction () is an organometallic chemical reaction in which, according to the classical definition, carbon alkyl, allyl, vinyl, or aryl magnesium halides (Grignard reagent) are added to the carbonyl groups of either an aldehyde or ketone under anhydrous conditions. This reaction is important for the formation of carbon–carbon bonds. History and definitions Grignard reactions and reagents were discovered by and are named after the French chemist François Auguste Victor Grignard (University of Nancy, France), who described them in 1900. He was awarded the 1912 Nobel Prize in Chemistry for this work. The reaction of an organic halide with magnesium is ''not'' a Grignard reaction, but provides a Grignard reagent.IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). . . Classically, the Grignard reaction refers to the reaction between a ketone or aldeh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
