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isomer

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isomer

1. Chem a compound that exhibits isomerism with one or more other compounds
2. Physics a nuclide that exhibits isomerism with one or more other nuclides
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

isomer

[′ī·sə·mər]
(chemistry)
One of two or more chemical substances having the same elementary percentage composition and molecular weight but differing in structure, and therefore in properties; there are many ways in which such structural differences occur; one example is provided by the compounds n-butane, CH3(CH2)2CH3, and isobutane, CH3CH(CH3)2.
(nuclear physics)
One of two or more nuclides having the same mass number and atomic number, but existing for measurable times in different quantum states with different energies and radioactive properties. Also known as nuclear isomer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
In this study, LC-MS analysis was used to sensitively and qualitatively analyze isomeric and isobaric plant metabolites by developing a MRM-dependent product ion scan (PIS) method.
To solve this problem, the complex Cd(II) tetrafluoroborates with isomeric phenylenediamines were synthesized and investigated: o-phenylenediamine (OPD, [pK.sub.a]=4.57), m-phenylenediamine (MPD, [pK.sub.a]=5.11), p-phenylenediamine (PPD, [pK.sub.a]=6.31).
In our recent study, the isomeric aroma components, (+)-limonene, and terpinolene produced different EEG activities in human according to gender difference [29].
A special thanks to sponsors, Isomeric Pharmacy Solutions, the Utah Society of Health System Pharmacists (USHP), the Drug Abuse and Awareness Team (DAAT), the Utah Pharmacists Association (UPhA), local food vendors Tushar's Brazilian Express and CupBop, and other local businesses who helped make the event a success.
[9] of a delayed isomeric state in [sup.205]Pb, which has serious implications for LS counting of [sup.209]Po.
Catechin and epicatechin as well as their four isomeric dimers (procyanidins) and five B-type isomeric trimers were discovered in all studied wines without any qualitative difference observed.
The isomeric methylchavicol (estragol) accounts for 4 per cent of the oil composition; it possesses an anise like smell but lacks the sweetish taste.
Age as a factor in the hemodynamic responses to isomeric exercise.
Nature equivalence of ZanthinNEX means that it has the same composition and isomeric structure as the astaxanthin found in natural algae and wild salmon, according to the company.
Thermal degradation and isomeric interconversion are the main challenges facing analytical chemists with the GC/MS analysis of BFRs.
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