منابع مشابه
Chemical “ Substances ” That Are Not “ Chemical Substances ”
The main scientific problems of chemical bonding were solved half a century ago, but adequate philosophical understanding of chemical combination is yet to be achieved. Chemists routinely use important terms (“element,” “atom,” “molecule,” “substance”) with more than one meaning. This can lead to misunderstandings. Eliminativists claim that what seems to be a baseball breaking a window is merel...
متن کاملLipotropic Substances *
Lipotropic action of choline In 1924 Allan, Bowie, Macleod, and Robinson' reported that depancreatized dogs receiving adequate amounts of insulin and maintained on a diet of lean meat, sucrose, and bone ash did not survive for periods of longer than a few months. They also observed that symptoms of failure of liver function due to fat infiltration of the liver found in such animals could be pre...
متن کاملPectic Substances
Pectins are a group of plant polysaccharides whose principal component is 1,4-linked a-d-galactosyluronic acid (O’Neill et al., 1990). Pectins are present in the primary cell walls of all seed-bearing plants and in the junction between cells called the middle lamella. The primary wall surrounds growing plant cells, meristematic cells and cells in succulent tissue such as fruit. The secondary wa...
متن کاملCacao Polyphenolic Substances
Specialities (Syntex) Co. Inc., New York City, for corticosterone and hydrocortisone; and to Dr W. J. Tindall of Organon Laboratories Ltd. for deoxycorticosterone. Dr K. Hallas-M0ller ofthe Novo Terapeutisk Laboratorium, Copenhagen, kindly gave us generous supplies of crystalline insulin free from glucagon. The technical assistance of Messrs S. C. Watson and B. W. E. Peaple is much appreciated,...
متن کاملPersistent Toxic Substances
Annex 12 addresses definitions, general principles, programs, monitoring, early warning system, human health, research, and reporting. This annex embraces the philosophy of zero discharge and the goal of virtual elimination, and the Parties have achieved considerable success in controlling direct, point source discharges of toxic chemicals to the lakes. The Commission finds, however, that there...
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ژورنال
عنوان ژورنال: Journal of Industrial & Engineering Chemistry
سال: 1915
ISSN: 0095-9014,1943-2968
DOI: 10.1021/ie50073a639