Definition of isomer in English:

isomer

noun ˈʌɪsəməˈaɪsəmər

1Chemistry
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
〔化〕同分异构体
Example sentencesExamples
- An aromatic molecule containing two nitro groups will have three positional isomers.
- The plant material contains only the active isomers.
- Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid.
- There is evidence that tocopherol isomers differ from each other in their functional properties.
- In 1907, he synthesized a pair of geometric isomers that confirmed his predictions.
- However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form.
2Physics
Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.
〔物理〕同质异能素
Example sentencesExamples
- One form is called the (+) isomer because it rotates polarized light to the right, in a positive direction.
- The article proclaimed the dawn of the age of atomic aircraft powered by hafnium-178 isomer reactors.
- Constitutional isomers are isomers that have different atomic connectivities.

Derivatives

isomeric

adjective ʌɪsəˈmɛrɪkˌaɪsəˈmɛrɪk

However, the intensity pattern of these vibrations is very much alike, which points to the same isomeric structure for these photoproducts.
Example sentencesExamples
- The results reveal that metal cation binding affects the protein conformation, the retinal isomeric composition as well as lipid head groups.
- There is also a significant difference according to the isomeric structure (a = Rp or b = Sp) for the samples 1a, b and 2a, b.
- The propyl group exists in two distinct isomeric forms.
- 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.

isomerism

noun ˈʌɪsəmərɪz(ə)maɪˈsɑməˌrɪzəm

The phenomenon of isomerism is often regarded as a success for atomism.
Example sentencesExamples
- Such substates result from a local isomerism of strategic residues of the heme pocket.
- This chain disorder results from trans-gauche isomerism about the C-C bonds in the lipid chains.
- 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.

isomerize

verb ʌɪˈsɒmərʌɪzaɪˈsɑməˌraɪz

[with object]

Chemistry

Change from one isomer to another.
the glucose is isomerized to fructose
Example sentencesExamples
- Cannabidiol is extracted from fiber cannabis and isomerized to dronabinol.
- 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.
- After binding to a blunt DNA end to form an initiation complex, the complex isomerizes to one of several possible unwinding states.

Origin

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

Definition of isomer in US English:

isomer

nounˈaɪsəmərˈīsəmər

1Chemistry
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
〔化〕同分异构体
Example sentencesExamples
- An aromatic molecule containing two nitro groups will have three positional isomers.
- There is evidence that tocopherol isomers differ from each other in their functional properties.
- In 1907, he synthesized a pair of geometric isomers that confirmed his predictions.
- The plant material contains only the active isomers.
- Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid.
- However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form.
2Physics
Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.
〔物理〕同质异能素
Example sentencesExamples
- Constitutional isomers are isomers that have different atomic connectivities.
- The article proclaimed the dawn of the age of atomic aircraft powered by hafnium-178 isomer reactors.
- 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’.

词汇	isomer
释义	Definition of isomer in English: isomer noun ˈʌɪsəməˈaɪsəmər 1Chemistry Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties. 〔化〕同分异构体 Example sentencesExamples An aromatic molecule containing two nitro groups will have three positional isomers. The plant material contains only the active isomers. Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid. There is evidence that tocopherol isomers differ from each other in their functional properties. In 1907, he synthesized a pair of geometric isomers that confirmed his predictions. However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form. 2Physics Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states. 〔物理〕同质异能素 Example sentencesExamples One form is called the (+) isomer because it rotates polarized light to the right, in a positive direction. The article proclaimed the dawn of the age of atomic aircraft powered by hafnium-178 isomer reactors. Constitutional isomers are isomers that have different atomic connectivities. Derivatives isomeric adjective ʌɪsəˈmɛrɪkˌaɪsəˈmɛrɪk However, the intensity pattern of these vibrations is very much alike, which points to the same isomeric structure for these photoproducts. Example sentencesExamples The results reveal that metal cation binding affects the protein conformation, the retinal isomeric composition as well as lipid head groups. There is also a significant difference according to the isomeric structure (a = Rp or b = Sp) for the samples 1a, b and 2a, b. The propyl group exists in two distinct isomeric forms. 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. isomerism noun ˈʌɪsəmərɪz(ə)maɪˈsɑməˌrɪzəm The phenomenon of isomerism is often regarded as a success for atomism. Example sentencesExamples Such substates result from a local isomerism of strategic residues of the heme pocket. This chain disorder results from trans-gauche isomerism about the C-C bonds in the lipid chains. 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. isomerize verb ʌɪˈsɒmərʌɪzaɪˈsɑməˌraɪz [with object]Chemistry Change from one isomer to another. the glucose is isomerized to fructose Example sentencesExamples Cannabidiol is extracted from fiber cannabis and isomerized to dronabinol. 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. After binding to a blunt DNA end to form an initiation complex, the complex isomerizes to one of several possible unwinding states. Origin Mid 19th century: from Greek isomerēs 'sharing equally', from isos 'equal' + meros 'a share'. Definition of isomer in US English: isomer nounˈaɪsəmərˈīsəmər 1Chemistry Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties. 〔化〕同分异构体 Example sentencesExamples An aromatic molecule containing two nitro groups will have three positional isomers. There is evidence that tocopherol isomers differ from each other in their functional properties. In 1907, he synthesized a pair of geometric isomers that confirmed his predictions. The plant material contains only the active isomers. Conjugated linoleic acid is a mixture of positional and geometric isomers of linoleic acid. However, several research groups have suggested cis isomers of lycopene are better absorbed than the all-trans form. 2Physics Each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states. 〔物理〕同质异能素 Example sentencesExamples Constitutional isomers are isomers that have different atomic connectivities. The article proclaimed the dawn of the age of atomic aircraft powered by hafnium-178 isomer reactors. 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’.
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