jean servais stas
. When the nursery was displanted, Stas and Van Mons’s other assistant, L. G. De Koninck, were provided with a large supply of fresh roots of apple trees from which they isolated a crystalline glucoside that they named phlorizin. . His work in this field was marked by extreme care, and he adopted the most minute precautions to avoid error, with such success that the greatest variation of individual determinations for each element are reported to be from 0.005 to 0.01. In September 1840 Stas was appointed to the chair of chemistry at the Military School in Brussels. In 1840 he left Paris on his appointment to the chair of chemistry at the Ecole Royale Militaire in Brussels. This publication led Marignac to doubt the universality of the law of definite proportions. Get the most important science stories of the day, free in your inbox. Other toxicologists then developed qualitative tests with the so-called Stas-Otto procedure to determine the presence of various alkaloids in the obtained extract. See also the following works by W. Spring: “Lecture sur la vie et les travaux de Stas,” in Bulletin de l’Académie royale de Belgique, Classe des sciences, 3rd ser., 21 (1878), 736–761; “Notice sur la vie et les travaux de Jean-Servais Stas,” in Annuaire de I’Académie royale de Belgique, 59 (1893), 2 17–376; and Académie Royale de Belgique, Biographie nationale, XXIII (Brussels, 1921 – 1924), cols. Molecular weight (MW) is the sum of the atomic weights of the atoms in a molecule. Therefore, that information is unavailable for most Encyclopedia.com content. Dumas, Jean-Baptiste-André A. Dumas's laboratory in Paris in order to continue a research on phloridzin which he had begun in an attic in his father's house, and he was associated with that chemist in several researches, including his redetermination of the atomic weight of carbon. In 1840, Stas was appointed professor at the Royal Military School in Brussels. He later switched to chemistry and worked at the École Polytechnique in Paris under the direction of Jean-Baptiste Dumas. Dictionaries thesauruses pictures and press releases, Complete Dictionary of Scientific Biography. His modest inheritance was exhausted by the research expenses of the laboratory that he had equipped in his own house, where he accomplished the first part of his work on atomic weights. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites: http://www.chicagomanualofstyle.org/tools_citationguide.html. https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/stas-jean-servais, "Stas, Jean-Servais (b. Alès [formerly Alais], Gard, France, 14 July 1800; d. Cannes, Fra…, Avogadro, Amedeo Stas and Dumas established the atomic weight of carbon by weighing a sample of the pure material, burning it in pure oxygen, and then weighing the carbon dioxide produced. World of Forensic Science. 654–684. Stas' practice of using the number 16 for oxygen on the periodic table as a reference point would continue well into the twentieth century, when chemists returned to basing atomic masses on carbon-12. - Please bookmark this page (add it to your favorites) Go to, To report dead links, typos, or html errors or suggestions about making these resources more useful use our convenient. - If you wish to link to this page, you can do so by referring to the URL address below. The Journal of Physical Chemistry. Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA). ANALYTICAL CHEMIST Copyright StatementThese files are public domain. (b. Germantown, Pennsylvania, 31 January 1868; d. Cambridge, Massachusetts, 2 April 1928) chemistry. (2017). He studied for a medical career and took his doctor's degree, but soon turned to chemistry. Stas's name is best known for his determination of the atomic weights of a number of the more important elements. In 1832 Stas entered the medical faculty of the University of Louvain. These poisons affect the central nervous system. In connexion with the poisoning of Count Hippolyte de Bocarme with nicotine in 1850 Stas worked out a method for the detection of the vegetable alkaloids, which, modified by Friedrich Julius Otto (1809-1870), professor of chemistry at Brunswick, has been widely used by' toxicologists as the Stas-Otto process.
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