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Edward Sucharda
Edward Sucharda (1891–1947) was a renowned Polish chemist and engineer. He was rector of Lwów University of Technology from 1938 to 1939 and vice-rector of Wrocław University of Technology from 1945 to 1947. Scientific activity Edward Sucharda's work was distinguished by four main areas of interest: The first was related to the chemistry of nitrogen heterocyclic compounds, which he took over from his mentor, Prof. Niementowski . It included the development of synthesis of azaaromatic compounds: derivatives of pyridine, naphthyridine and phenanthroline (pupils and co-workers: Bogusław Bobrański, Henryk Kuczyński, C. Troszkiewicz, Zofia Skrowaczewska). Another important work was the synthesis of indigo and its derivatives by an ortho-condensation route (jointly with Edwin Płażek). The second separate field of interest of Prof. Suchardy was the quantitative analysis of organic compounds. In 1928, together with B. Bobrański, he presented a completely new method ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berezhany
Berezhany ( uk, Бережани, ; pl, Brzeżany; yi, ברעזשאַן, Brezhan; he, בּז'יז'אני/בּז'ז'ני ''Bzhezhani''/''Bzhizhani'') is a city in Ternopil Raion, Ternopil Oblast (province) of western Ukraine. It lies about from the oblast capital, Ternopil. The city is about above sea level. The yearly temperature in Berezhany ranges from in winter to in summer. Berezhany hosts the administration of Berezhany urban hromada, one of the hromadas of Ukraine. Population: History The first written mention of Berezhany dates from 1374, when the village was granted by the Governor of Galicia and Lodomeria Vladislaus II to Ruthenian boyar Vas'ko Teptukhovych. Shortly afterwards, in the 14th century it became a part of Poland and became the property of a noble family from Buchach — members House of Buczacki, later Sieniawa. As Mikołaj Sieniawski, a notable Polish military commander and politician envisioned a seat of his family there, on March 19, 1530, Kin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indigo Dye
Indigo dye is an organic compound with a distinctive blue color. Historically, indigo was a natural dye extracted from the leaves of some plants of the ''Indigofera'' genus, in particular ''Indigofera tinctoria''; dye-bearing ''Indigofera'' plants were commonly grown and used throughout the world, in Asia in particular, as an important crop, with the production of indigo dyestuff economically important due to the previous rarity of some blue dyestuffs historically. Most indigo dye produced today is synthetic, constituting several thousand tons each year. It is most commonly associated with the production of denim cloth and blue jeans, where its properties allow for effects such as stone washing and acid washing to be applied quickly. Uses The primary use for indigo is as a dye for cotton yarn, mainly used in the production of denim cloth suitable for blue jeans; on average, a pair of blue jeans requires just to of dye. Smaller quantities are used in the dyeing of wool and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polish Chemists
Polish may refer to: * Anything from or related to Poland, a country in Europe * Polish language * Poles, people from Poland or of Polish descent * Polish chicken *Polish brothers (Mark Polish and Michael Polish, born 1970), American twin screenwriters Polish may refer to: * Polishing, the process of creating a smooth and shiny surface by rubbing or chemical action ** French polishing, polishing wood to a high gloss finish * Nail polish * Shoe polish * Polish (screenwriting), improving a script in smaller ways than in a rewrite See also * * * Polonaise (other) A polonaise ()) is a stately dance of Polish origin or a piece of music for this dance. Polonaise may also refer to: * Polonaises (Chopin), compositions by Frédéric Chopin ** Polonaise in A-flat major, Op. 53 (french: Polonaise héroïque, lin ... {{Disambiguation, surname Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1947 Deaths
It was the first year of the Cold War, which would last until 1991, ending with the dissolution of the Soviet Union. Events January * January–February – Winter of 1946–47 in the United Kingdom: The worst snowfall in the country in the 20th century causes extensive disruption of travel. Given the low ratio of private vehicle ownership at the time, it is mainly remembered in terms of its effects on the railway network. * January 1 - The Canadian Citizenship Act comes into effect. * January 4 – First issue of weekly magazine ''Der Spiegel'' published in Hanover, Germany, edited by Rudolf Augstein. * January 10 – The United Nations adopts a resolution to take control of the free city of Trieste. * January 15 – Elizabeth Short, an aspiring actress nicknamed the "Black Dahlia", is found brutally murdered in a vacant lot in Los Angeles; the mysterious case is never solved. * January 16 – Vincent Auriol is inaugurated as president of France. * January 19 – Ferry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1891 Births
Events January–March * January 1 ** Paying of old age pensions begins in Germany. ** A strike of 500 Hungarian steel workers occurs; 3,000 men are out of work as a consequence. **Germany takes formal possession of its new African territories. * January 2 – A. L. Drummond of New York is appointed Chief of the Treasury Secret Service. * January 4 – The Earl of Zetland issues a declaration regarding the famine in the western counties of Ireland. * January 5 **The Australian shearers' strike, that leads indirectly to the foundation of the Australian Labor Party, begins. **A fight between the United States and Indians breaks out near Pine Ridge agency. ** Henry B. Brown, of Michigan, is sworn in as an Associate Justice of the Supreme Court. **A fight between railway strikers and police breaks out at Motherwell, Scotland. * January 6 – Encounters continue, between strikers and the authorities at Glasgow. * January 7 ** General Miles' force ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Structure
A chemical structure determination includes a chemist's specifying the molecular geometry and, when feasible and necessary, the electronic structure of the target molecule or other solid. Molecular geometry refers to the spatial arrangement of atoms in a molecule and the chemical bonds that hold the atoms together, and can be represented using structural formulae and by molecular models; complete electronic structure descriptions include specifying the occupation of a molecule's molecular orbitals. Structure determination can be applied to a range of targets from very simple molecules (e.g., diatomic oxygen or nitrogen), to very complex ones (e.g., such as protein or DNA). Background Theories of chemical structure were first developed by August Kekulé, Archibald Scott Couper, and Aleksandr Butlerov, among others, from about 1858. These theories were first to state that chemical compounds are not a random cluster of atoms and functional groups, but rather had a definite order ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camphor
Camphor () is a waxy, colorless solid with a strong aroma. It is classified as a terpenoid and a cyclic ketone. It is found in the wood of the camphor laurel ('' Cinnamomum camphora''), a large evergreen tree found in East Asia; and in the kapur tree ( ''Dryobalanops'' sp.), a tall timber tree from South East Asia. It also occurs in some other related trees in the laurel family, notably '' Ocotea usambarensis''. Rosemary leaves (''Rosmarinus officinalis'') contain 0.05 to 0.5% camphor, while camphorweed (''Heterotheca'') contains some 5%. A major source of camphor in Asia is camphor basil (the parent of African blue basil). Camphor can also be synthetically produced from oil of turpentine. The compound is chiral, existing in two possible enantiomers as shown in the structural diagrams. The structure on the left is the naturally occurring (+)-camphor ((1''R'',4''R'')-bornan-2-one), while its mirror image shown on the right is the (−)-camphor ((1''S'',4''S'')-bornan-2-one). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terpenoid
The terpenoids, also known as isoprenoids, are a class of naturally occurring organic chemicals derived from the 5-carbon compound isoprene and its derivatives called terpenes, diterpenes, etc. While sometimes used interchangeably with "terpenes", terpenoids contain additional functional groups, usually containing oxygen. When combined with the hydrocarbon terpenes, terpenoids comprise about 80,000 compounds. They are the largest class of plant secondary metabolites, representing about 60% of known natural products. Many terpenoids have substantial pharmacological bioactivity and are therefore of interest to medicinal chemists. Plant terpenoids are used for their aromatic qualities and play a role in traditional herbal remedies. Terpenoids contribute to the scent of eucalyptus, the flavors of cinnamon, cloves, and ginger, the yellow color in sunflowers, and the red color in tomatoes. Well-known terpenoids include citral, menthol, camphor, salvinorin A in the plant '' Salvia di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drohobych
Drohobych ( uk, Дрого́бич, ; pl, Drohobycz; yi, דראָהאָביטש;) is a city of regional significance in Lviv Oblast, Ukraine. It is the administrative center of Drohobych Raion and hosts the administration of Drohobych urban hromada, one of the hromadas of Ukraine. In 1939–1941 and 1944–1959 it was the center of Drohobych Oblast. The city was founded at the end of eleventh century as an important trading post and transport node between Kyiv Rus' and the lands to the West of Rus'. After extinction of the local Ruthenian dynasty and subsequent incorporation of the Kingdom of Galicia–Volhynia into the Polish Kingdom by 1349, from the fifteenth century the city was developing as a mercantile and saltworks centre. Drohobych became part of the Habsburg Empire in 1772 after the first partition of Polish–Lithuanian Commonwealth. In the mid-nineteenth century it became Europe's largest oil extraction center, which significantly contributed to its rapid developm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zgierz
Zgierz is a city in central Poland, located just to the north of Łódź, and part of the metropolitan area centered on that city. As of 2021 it had a population of 54,974. Zgierz is situated in the Łódź Voivodeship (since 1999); previously it was in Łódź Metro Voivodeship (1975–1998). It's the capital of Zgierz County. History Zgierz is one of the oldest cities in central Poland. The oldest known mention of Zgierz comes from 1231, when two dukes of fragmented Piast-ruled Poland, Władysław Odonic of Greater Poland and Konrad I of Masovia, held a meeting there. Zgierz acquired its town rights some time before 1288, and those rights were renewed by Polish King Władysław II Jagiełło in 1420. In 1494, King John I Albert exempted the town from taxes for 10 years, and in 1504, King Alexander Jagiellon established three annual fairs. Zgierz was a royal town of Poland, administratively located in the Łęczyca Voivodeship in the Greater Poland Province of the Polish C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fritz Pregl
Fritz Pregl ( sl, Friderik Pregl; 3 September 1869 – 13 December 1930), was a Slovenian-Austrian chemist and physician from a mixed Slovene-German-speaking background. He won the Nobel Prize in Chemistry in 1923 for making important contributions to quantitative organic microanalysis, one of which was the improvement of the combustion train technique for elemental analysis. Biography Pregl was born in Ljubljana within Austria-Hungary to a Slovene-speaking father and German-speaking mother. He was baptized ''Friedrich Michael Raimund Pregl''. He died in Graz, Austria in 1930. Pregl started his career as chemist after he studied medicine at the University of Graz. With his focus on physiology and especially chemical physiology, he suffered from the limitations of quantitative organic microanalysis. The small quantities of substances he obtained during the research of bile acid made it necessary to improve the process of elemental analysis by reducing the necessary component ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantitative Analysis (chemistry)
In analytical chemistry, quantitative analysis is the determination of the absolute or relative abundance (often expressed as a concentration) of one, several or all particular substance(s) present in a sample. Methods Once the presence of certain substances in a sample is known, the study of their absolute or relative abundance could help in determining specific properties. Knowing the composition of a sample is very important, and several ways have been developed to make it possible, like gravimetric and volumetric analysis. Gravimetric analysis yields more accurate data about the composition of a sample than volumetric analysis but also takes more time to perform in the laboratory. Volumetric analysis, on the other hand, doesn't take that much time and can produce satisfactory results. Volumetric analysis can be simply a titration based in a neutralization reaction but it can also be a precipitation or a complex forming reaction as well as a titration based in a redox reactio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
