Share this entry

Share this page

isomer

Syllabification: i·so·mer
Pronunciation: /ˈīsəmər
 
/

Definition of isomer in English:

noun

1 Chemistry Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
Example sentences
  • However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form.
  • Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid.
  • In 1907, he synthesized a pair of geometric isomers that confirmed his predictions.
2 Physics Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.
Example sentences
  • The Texas collaboration purports to have demonstrated that a 10-keV x-ray photon can precipitate a prompt 2.45 - MeV gamma-ray cascade as the isomer Hf m2 relaxes to the stable nuclear ground state.
  • Constitutional isomers are isomers that have different atomic connectivities.
  • One form is called the (+) isomer because it rotates polarized light to the right, in a positive direction.

Origin

mid 19th century: from Greek isomerēs 'sharing equally', from isos 'equal' + meros 'a share'.

Derivatives

isomeric

1
Pronunciation: /ˌīsəˈmerik/
adjective
Example sentences
  • There is also a significant difference according to the isomeric structure (a = Rp or b = Sp) for the samples 1a, b and 2a, b.
  • At very high temperatures, part of the Lu decay to Hf bypasses the conventional slow route, and goes into an isomeric state which has a half-life of only 3.68 hours.
  • The results reveal that metal cation binding affects the protein conformation, the retinal isomeric composition as well as lipid head groups.

isomerism

2
Pronunciation: /īˈsäməˌrizəm/
noun
Example sentences
  • The authors concluded that this isomerism could explain the differential biological effects of CHH (hyperglycemia and molt-inhibition).
  • The second major type of isomerism is stereoisomerism.
  • This chain disorder results from trans-gauche isomerism about the C-C bonds in the lipid chains.

isomerize

3
Pronunciation: /īˈsäməˌrīz/
verb
Example sentences
  • After binding to a blunt DNA end to form an initiation complex, the complex isomerizes to one of several possible unwinding states.
  • In response to absorption of a photon, the 11-cis-retinal isomerizes to the all-trans conformation, inducing helix 3 to shift toward the extracellular side.
  • Cannabidiol is extracted from fiber cannabis and isomerized to dronabinol.

Words that rhyme with isomer

ashrama • gossamer

Definition of isomer in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day snarf
Pronunciation: snɑːf
verb
eat or drink quickly or greedily