The word isomerism was coined by Berzelius to express this anomalous condition of things, which seemed to negative the most fundamental truths of chemistry. From Wordnik.com. [A History of Science: in Five Volumes. Volume IV: Modern Development of the Chemical and Biological Sciences] Reference
This phenomenon is called isomerism, and the generally accepted explanation is that the atoms in isomeric molecules are differently arranged, or grouped, in space. From Wordnik.com. [Four-Dimensional Vistas] Reference
The phenomenon of isomerism is often regarded as a success for atomism. From Wordnik.com. [Atomism from the 17th to the 20th Century] Reference
It was there I got my introduction to optical isomerism and the tetrahedral carbon atom. From Wordnik.com. [William S. Knowles - Autobiography] Reference
Further, the allotropic modifications of elements and the isomerism of compounds increased the difficulties. From Wordnik.com. [Scientific American Supplement, No. 643, April 28, 1888] Reference
There is no need for me to go into the familiar story of how isomerism was discovered; I should like to single out just one point. From Wordnik.com. [Wilhelm Ostwald - Nobel Lecture] Reference
His other investigations in nuclear physics cover many subjects, e.g., isomerism, spontaneous fission, and lately high-energy physics. From Wordnik.com. [Emilio Segrè - Biography] Reference
The results obtained were quite unexpected, and furnished additional and most important evidence in favor of the doctrine of isomerism. From Wordnik.com. [Scientific American Supplement, No. 362, December 9, 1882] Reference
He gave to us the basic methods of analysis which made chemistry an exact science, and endowed us with the pregnant ideas of isomerism and catalysis. From Wordnik.com. [Ronald G.W. Norrish - Banquet Speech] Reference
This assumption is supported by evidence ... of the existence of such isomerism in the crystalline antineuritic substances obtainable from brewer's yeast. From Wordnik.com. [The Vitamine Manual] Reference
The practice of identifying a chemical compound only by its composing elements was the norm in chemistry, until the discovery of isomerism by Friedrich Woehler in 1827. From Wordnik.com. [Natural Kinds] Reference
This is obviously important in such cases where we have to deal with chemical compounds of identical composition but of different structure, i.e. where isomerism is present. From Wordnik.com. [Nobel Prize in Chemistry 1936 - Presentation Speech] Reference
Sometimes, Mrs. Janner, it is important to remember that life is an isomerism in which the isomers change into one another with great ease so that they ordinarily exist together in equilibrium. From Wordnik.com. [Trisomy] Reference
It is true that such cases of isomerism are as yet unknown, but we do know that certain metals, in our present state of knowledge, yield oxychlorides only, while others only form hypochlorous salts. From Wordnik.com. [Scientific American Supplement No. 822, October 3, 1891] Reference
Even in his earlier investigations into certain metal ammonias he was able to show that numerous cases of isomerism in complex cobalt and platinum compounds could only be satisfactorily explained by steric approach. From Wordnik.com. [Nobel Prize in Chemistry 1913 - Presentation Speech] Reference
And these very same new concepts which had become decisive for the triumphing theories, i.e. isomerism and constitution, were formulated by the thinker whose theories his short-sighted opponents thought they had everywhere disposed of and vanquished. From Wordnik.com. [Wilhelm Ostwald - Nobel Lecture] Reference
Our countryman Berzelius upset this doctrine by his discovery of isomerism, in that he showed that two or more compounds may be completely identical in their composition, but may nevertheless diverge more or less in their chemical and physical relations. From Wordnik.com. [Nobel Prize in Chemistry 1921 - Presentation Speech] Reference
By showing that ammonium cyanate can become urea by an internal arrangement of its atoms, without gaining or losing in weight, Wöhler furnished one of the first and best examples of isomerism, which helped to demolish the old view that equality of composition could not coexist in two bodies, A and B, with differences in their respective physical and chemical properties. From Wordnik.com. [Scientific American Supplement, No. 362, December 9, 1882] Reference
This type of isomerism is called structural isomerism. From Wordnik.com. [Recently Uploaded Slideshows] Reference
It is in such cases that isomerism is observed to occur. From Wordnik.com. [A History of Science: in Five Volumes. Volume IV: Modern Development of the Chemical and Biological Sciences] Reference
Other arguments are drawn from chemistry, especially from the facts of isomerism, polymerism, and allotropism. From Wordnik.com. [The Catholic Encyclopedia, Volume 4: Clandestinity-Diocesan Chancery] Reference
Slide 20: Dienes, Trienes, and Polyenes • for alkenes with n double bonds, each of which can show cis, trans isomerism, 2n stereoisomers are possible • example: 22. From Wordnik.com. [Recently Uploaded Slideshows] Reference
If this greater freedom of position were permissible to atoms, it would help to explain such chemical phenomena as isomerism, where molecules of identical composition have different properties. From Wordnik.com. [The Fourth Dimension Simply Explained] Reference
Cited2 deficiency results in heart defects in mice and in humans and can also lead to a serious type of heart defect called atrial isomerism, where the left-right asymmetry of the heart is disturbed. From Wordnik.com. [Winnipeg Sun] Reference
Among offspring mice that were deficient in Cited2, the risk of atrial isomerism more than doubled, the researchers found, and the risk of cleft palate increased more than seven-fold when the mothers were fed a high fat diet. From Wordnik.com. [Winnipeg Sun] Reference
It is worth noting that even if the composition were identical, which it clearly isn't, the actual structure/connectivity is what is significant, a situation well known in chemistry as isomerism at a molecular level and polymorphism. From Wordnik.com. [WHAT REALLY HAPPENED] Reference
Slide 21: Dienes, Trienes, and Polyenes • vitamin A, a biologically important compound for which a number of cis, trans isomers is possible • there are four double bonds about which cis, trans isomerism is possible, for 24 = 16 stereoisomers CH2 OH V itamin A. From Wordnik.com. [Recently Uploaded Slideshows] Reference
It is worth noting that even if the composition were identical, which it clearly isn't, the actually structure/connectivity is what is significant, a situation well known in chemistry as isomerism at a molecular level and polymorphism (materials science) in the case of non-molecular materials or crystals. From Wordnik.com. [Propeller Most Popular Stories] Reference
The SCXmini X-ray diffractometer will be employed to strengthen research endeavors and spark new explorations in areas involving: sulfide and selenide materials, solid state linkage isomerism and ligand substitution in transition metal cyanide complexes, conformational isomers of immobilized calix arenes, polyhedral borane anions, sulfido-bridged iron compounds and magnetostructural studies of Ni (II) dimers, and the preparation of titanium complexes as well as a variety of other research topics. From Wordnik.com. [JCN Newswire] Reference
The phenomena of isomerism, or identity of composition and proportions of constituents with difference of qualities, and of isomorphism, or identity of form in crystals which have one element substituted for another, were equally surprises to science; and although the mechanism by which they are brought about can be to a certain extent explained by a reference to the hypothetical atoms of which the elements are constituted, yet this is only turning the difficulty into a fraction with an infinitesimal denominator and an infinite numerator. From Wordnik.com. [Medical Essays, 1842-1882] Reference
This is the concept of isomerism. From Wordnik.com. [Wilhelm Ostwald - Nobel Lecture] Reference
As other instances of most admirable exposition, we may call attention to the paragraphs on crystallization, on the atomic theory, on isomerism and allotropism, on diamagnetism, magnetic induction, and electric "currents," on the sources of heat, on the chemical and thermal spectra, on the correlation and equivalence of the forces, on the theory of ozone, on the exceptional expansion of water and the supposed complexity of its atom, on the structure of flame, on the constitution of salts, on the colloid condition of matter, on types and compound radicles, on the dynamics of vegetable growth and the production of animal power, and, above all, to the passage which describes the phenomena of latent heat. From Wordnik.com. [The Atlantic Monthly, Volume 14, No. 82, August, 1864] Reference
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