isomer
Noun
Meaning
A body or compound which is isomeric with another body or compound; a member of an isomeric series.
Source: Webster's dictionarySynonyms
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Examples
A nonnative isomer of some peptide groups can disrupt the conformational folding significantly, either slowing it or preventing it from even occurring until the native isomer is reached.
A mer isomer can be considered as a combination of a trans and a cis, since it contains both trans and cis pairs of identical ligands.
As an example of a geometric isomer due to a ring structure, consider 1,2-dichlorocyclohexane: Comparison of physical properties Cis and trans isomers often have different physical properties.
An isomer of tretinoin, isotretinoin is also used orally (under the trade names Accutane and Roaccutane), generally for severe or recalcitrant acne.
A nuclear isomer may also be called a " meta -state", meaning the system has more internal energy than the " ground state " (the state with the lowest possible internal energy), making the former likely to decay into the latter.
All "stable" isotopes (stable by observation, not theory) are the ground states of nuclei, with the exception of tantalum-180m, which is a nuclear isomer or excited state.