| 单词 | isomerism |
| 例句 | What they discovered were new examples of nuclear isomerism, in which isotopes of identical mass numbers and changes show dramatically different radioactive characteristics. Big Science 2015-07-07T00:00:00Z Such as: the meaning of isomerism; what a categorical syllogism is; and who the Hanseatic League were. University Challenge | TV Review 2010-04-06T05:45:00Z Four carbon atoms in the chain of butene allows for the formation of isomers based on the position of the double bond, as well as a new form of isomerism. Chemistry 2019-02-14T00:00:00Z This kind of trans–cis isomerism happens often in biological systems, such as the chemical process underlying vision. The next big hit in molecule Hollywood 2017-04-25T04:00:00Z That example is the case of optical isomerism. Drugs that live long will prosper 2015-09-03T04:00:00Z From these results it follows that the two acids are structurally identical, and the isomerism has consequently to be explained on other grounds. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Together, the two concepts of isomerism and isomorphism seemed to cover all the known exceptions from the simplest assumption as to specificity and chemical composition. History of Phosphorus And here, because the image of a simple molecule upon a plane does not suffice to explain, for example, the facts of isomerism, we must resort to the stereo-chemical representation of Van't Hoff. Creative Intelligence Essays in the Pragmatic Attitude In order to arrive at a conception of this multiplicity of isomeric forms, it is necessary to understand the two types of isomerism which are involved. The Chemistry of Plant Life Among the special may be named the parallelism between allotropy and isomerism; the numerous lines in the spectrum of each element; and the cyclical law of Newlands and Mendeljeff. Essays: Scientific, Political, & Speculative, Vol. I The well known hypothesis of these authors was put forward to account for a certain kind of so-called physical isomerism which shows itself in the action of substances upon polarized light. Scientific American Supplement, No. 633, February 18, 1888 Further, the allotropic modifications of elements and the isomerism of compounds increased the difficulties. Scientific American Supplement, No. 643, April 28, 1888 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. Scientific American Supplement No. 822, October 3, 1891 One of these is structural isomerism, and the other is space- or stereo-isomerism. The Chemistry of Plant Life This phenomenon is called isomerism, and the generally accepted explanation is that the atoms in isomeric molecules are differently arranged, or grouped, in space. Four-Dimensional Vistas More than one hypothesis has been proposed to account for these cases of isomerism, but no one has shown itself to be entirely satisfactory. Scientific American Supplement, No. 633, February 18, 1888 The results obtained were quite unexpected, and furnished additional and most important evidence in favor of the doctrine of isomerism. Scientific American Supplement, No. 362, December 9, 1882 This assumption is supported by evidence … of the existence of such isomerism in the crystalline antineuritic substances obtainable from brewer's yeast. The Vitamine Manual The word isomerism was coined by Berzelius to express this anomalous condition of things, which seemed to negative the most fundamental truths of chemistry. A History of Science — Volume 4 It is in such cases that isomerism is observed to occur. A History of Science — Volume 4 |
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