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Jean-François Persoz
Jean-François Persoz (9 June 1805–September 1868) was a French chemist known for discovering the enzyme diastase and on the properties of dextrin. He also wrote a report that coined the name cellulose. Born in Cortaillod, Persoz studied physical science in Paris under Louis Jacques Thénard and received his doctorate in 1833. Persoz was a professor of chemistry at the University of Strasbourg since 1833 and then a professor of dyeing and calico-printing at the Conservatoire des Arts et Metiers since 1852. His work on diastase, also known as amylase, was carried out in collaboration with Anselme Payen Anselme Payen (; 6 January 1795 – 12 May 1871) was a French chemist known for discovering the enzyme diastase, and the carbohydrate cellulose. Biography Payen was born in Paris. He began studying science with his father when he was a 13-yea ... and published in 1833. His work on dextrin was carried out in collaboration with J.B. BiotBiot, J. B., Persoz, J.: Ann. Chim. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diastase
A diastase (; from Greek διάστασις, "separation") is any one of a group of enzymes that catalyses the breakdown of starch into maltose. For example, the diastase α-amylase degrades starch to a mixture of the disaccharide maltose; the trisaccharide maltotriose, which contains three α (1-4)-linked glucose residues; and oligosaccharides, known as dextrins, that contain the α (1-6)-linked glucose branches. Diastase was the first enzyme discovered. It was extracted from malt solution in 1833 by Anselme Payen and Jean-François Persoz, chemists at a French sugar factory. The name "diastase" comes from the Greek word διάστασις (''diastasis'') (a parting, a separation), because when beer mash is heated, the enzyme causes the starch in the barley seed to transform quickly into soluble sugars and hence the husk to separate from the rest of the seed. Today, "diastase" refers to any α-, β-, or γ-amylase (all of which are hydrolases) that can break down carbohydra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dextrin
Dextrins are a group of low-molecular-weight carbohydrates produced by the hydrolysis of starch and glycogen. Dextrins are mixtures of polymers of D-glucose units linked by α-(1→4) or α-(1→6) glycosidic bonds. Dextrins can be produced from starch using enzymes like amylases, as during digestion in the human body and during malting and mashing in beer brewing or by applying dry heat under acidic conditions (pyrolysis or roasting). This procedure was first discovered in 1811 by Edme-Jean Baptiste Bouillon-Lagrange. The latter process is used industrially, and also occurs on the surface of bread during the baking process, contributing to flavor, color and crispness. Dextrins produced by heat are also known as pyrodextrins. Starch hydrolyses during roasting under acidic conditions, and short-chained starch parts partially rebranch with α-(1,6) bonds to the degraded starch molecule. See also Maillard reaction. Dextrins are white, yellow, or brown powders that are partially o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cellulose
Cellulose is an organic compound with the chemical formula, formula , a polysaccharide consisting of a linear chain of several hundred to many thousands of glycosidic bond, β(1→4) linked glucose, D-glucose units. Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. Some species of bacteria secrete it to form biofilms. Cellulose is the most abundant biopolymer, organic polymer on Earth. The cellulose content of cotton fibre is 90%, that of wood is 40–50%, and that of dried hemp is approximately 57%. Cellulose is mainly used to produce paperboard and paper. Smaller quantities are converted into a wide variety of derivative products such as cellophane and rayon. Conversion of cellulose from energy crops into biofuels such as cellulosic ethanol is under development as a renewable fuel source. Cellulose for industrial use is mainly obtained from wood pulp and cotton. Cellulose is also greatly affected by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cortaillod
Cortaillod is a Municipalities of Switzerland, municipality in the Cantons of Switzerland, canton of Neuchâtel (canton), Neuchâtel in Switzerland. The Neolithic Cortaillod culture was named after Cortaillod, where four Neolithic villages have been discovered. History Cortaillod is first mentioned in 1311 as ''Cortaillot''. Neolithic settlements Cortaillod gave its name to the Cortaillod culture, a Neolithic culture in Switzerland and surrounding areas. There are four Neolithic sites along the lake shore at Cortaillod; La Fabrique or Le Vivier which is now eroding, Les Cotes which was almost completely washed out in 1880, Petit-Cortaillod and La Tuillières. At La Tuillières several large flint and stone axes were found. Petit-Cortaillod is the largest and most productive. It is about and is between thick. These sites were originally underwater, but were discovered when the water level of Lake Neuchâtel dropped. Because they were no longer flooded, between 1876 and 18 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis Jacques Thénard
Louis Jacques Thénard (4 May 177721 June 1857) was a French chemist. Life He was born in a farm cottage near Nogent-sur-Seine in the Champagne district the son of a farm worker. In the post-Revolution French educational system, most boys received scholarships for education up to age 14, and this allowed him to be educated at the academy at Sens. He then went at the age of sixteen to study pharmacy in Paris. There he attended the lectures of Antoine François Fourcroy and Louis Nicolas Vauquelin. He was allowed into Vauquelin's laboratory even though he was unable to pay the monthly fee of 20 francs, due to the requests of Vauquelin's sisters. But his progress was so rapid that in two or three years he was able to take his master's place at the lecture-table, and Fourcroy and Vauquelin were so satisfied with his performance that they procured for him a school appointment in 1797 as a teacher of chemistry, and in 1798 one as at the École Polytechnique. Career In 1804 Vauquel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Strasbourg
The University of Strasbourg (, Unistra) is a public research university located in Strasbourg, France, with over 52,000 students and 3,300 researchers. Founded in the 16th century by Johannes Sturm, it was a center of intellectual life during the Age of Enlightenment. The old university was split into three separate entities in the 1970s before merging back together in 2009. Today, the University of Strasbourg comprises 35 academic faculties, schools, and institutes, as well as 71 research laboratories spread across six campuses, including the historic site in the Neustadt. Throughout its existence, Unistra alumni, faculty, or researchers have included 18 Nobel laureates, two Fields Medalists and a wide range of notable individuals in their respective fields. Among them are Goethe, statesman Robert Schuman, historian Marc Bloch and several chemists such as Louis Pasteur. History The university emerged from the Jean Sturm Gymnasium, a gymnasium of Lutheran and humanist ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conservatoire Des Arts Et Metiers
A music school is an educational institution specialized in the study, training, and research of music. Such an institution can also be known as a school of music, music academy, music faculty, college of music, music department (of a larger institution), conservatory, conservatorium or conservatoire ( , ). Instruction consists of training in the performance of musical instruments, singing, musical composition, conducting, musicianship, as well as academic and research fields such as musicology, music history and music theory. Music instruction can be provided within the compulsory general education system, or within specialized children's music schools such as the Purcell School. Elementary-school children can access music instruction also in after-school institutions such as music academies or music schools. In Venezuela El Sistema of youth orchestras provides free after-school instrumental instruction through music schools called ''núcleos''. The term "music school" c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anselme Payen
Anselme Payen (; 6 January 1795 – 12 May 1871) was a French chemist known for discovering the enzyme diastase, and the carbohydrate cellulose. Biography Payen was born in Paris. He began studying science with his father when he was a 13-year-old, and later studied Chemistry at the École Polytechnique under the chemists Louis Nicolas Vauquelin and Michel Eugène Chevreul. At the age of 23, Payen became manager of a borax-refining factory, where he developed a process for synthesizing borax from soda and boric acid. Previously, all borax had been imported from the East Indies exclusively by the Dutch. Payen's new method of synthesizing borax allowed him to sell the mineral at one third the going price, and break the Dutch monopoly. Payen also developed processes for refining sugar, along with a way to refine starch and alcohol from potatoes, and a method for determination of nitrogen. Payen invented a decolorimeter, which dealt with the analysis, decolorization, bleaching, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annales De Chimie Et De Physique
__NOTOC__ ''Annales de chimie et de physique'' (, ) is a scientific journal founded in Paris, France, in 1789 under the title ''Annales de chimie''. One of the early editors was the French chemist Antoine Lavoisier. Lavoisier, an aristocrat, was guillotined in May 1794, ostensibly for tax fraud: and the journal was not published from 1794 to 1796 while the Reign of Terror was at its height under the French Directory. In 1815, it became the ''Annales de chimie et de physique'', and was published under that name for the next 100 years. In 1914, it split into two successor journals. The first one, '' Annales de physique'', was latterly published by EDP Sciences under the same name up to 2009, when it became integrated in the '' European Physical Journal'' series as the '' European Physical Journal H – Historical Perspectives on Contemporary Physics''. The second successor, ''Annales de chimie'', later became '' Annales de chimie: Science des matériaux'' in 1978; from 1998 to 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1805 Births
After thirteen years the First French Empire abolished the French Republican Calendar in favour of the Gregorian calendar. Events January–March * January 11 – The Michigan Territory is created. * February 7 – King Anouvong becomes ruler of Vientiane on the death of his brother Inthavong. * February 15 – The Harmony Society is officially formed as a Christian community in Harmony, Pennsylvania. * March 1 – Justice Samuel Chase is Impeachment of Samuel Chase, acquitted of impeachment charges by the United States Senate. * March 5 – The New Brunswick Legislature passes a bill to advance literacy in the province, which eventually leads to the creation of public education in Canada. April–June * April 7 – Ludwig van Beethoven, Beethoven's Symphony No. 3 (Beethoven), Symphony No. 3, ''Eroica'', has its public premiere at the Theater an der Wien in Vienna under his baton. * April 27 – Battle of Derne: United States Marines and Berbers attack the Tripoli, Lib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1868 Deaths
Events January * January 2 – British Expedition to Abyssinia: Robert Napier leads an expedition to free captive British officials and missionaries. * January 3 – The 15-year-old Mutsuhito, Emperor Meiji of Japan, declares the ''Meiji Restoration'', his own restoration to full power, under the influence of supporters from the Chōshū and Satsuma Domains, and against the supporters of the Tokugawa shogunate, triggering the Boshin War. * January 5 – Paraguayan War: Brazilian Army commander Luís Alves de Lima e Silva, Duke of Caxias, enters Asunción, Paraguay's capital. Some days later he declares the war is over. Nevertheless, Francisco Solano López, Paraguay's president, prepares guerrillas to fight in the countryside. * January 7 – The Arkansas constitutional convention meets in Little Rock. * January 9 – Penal transportation from Britain to Australia ends, with arrival of the convict ship ''Hougoumont'' in Western Australia, after a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
