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词汇 epimer
释义

Definition of epimer in English:

epimer

noun ˈɛpɪməˈepəmər
Chemistry
  • Each of two isomers with different configurations of atoms about one of several asymmetric carbon atoms present.

    〔化〕差向(立体)异构体,差位(立体)异构体

    Example sentencesExamples
    • Glucose and galactose are structurally similar, being epimers, while the lactose permease transports a wide variety of galactosides.
    • To our knowledge, this is the first example of two highly homologous enzymes belonging to the same gene family, and catalyzing the formation of two distinct epimers from a same substrate.
    • This study was not able to show any difference in the effect of KP - 23S and KP - 23R epimers on the bilayer.
    • However, it has not been unraveled why so many different BChI homologs and epimers exist in chlorosomes and how they arrange themselves to form light-harvesting antennas.
    • Yet, fungi could probably utilize the glucuronic acid residue in glucuronides as a carbon source because they can metabolize galacturonic acid, an epimer of glucuronic acid.

Derivatives

  • epimeric

  • adjectiveɛpɪˈmɛrɪk
    Chemistry
    • The spectral properties of the Soret band were basically unchanged among the epimers or epimeric / homologous mixtures.
      Example sentencesExamples
      • X-ray crystallographic studies revealed that the KP - 23 molecule crystallizes in epimeric form in the triclinic P1 space group and possesses four chiral centers.
      • Gonyautoxin 2,3 and Gonyautoxin 1,4 are epimeric mixtures of C - 11 sulfated derivatives of saxitoxin and neosaxitoxin, respectively.
      • Abstract Epicholesterol is an epimeric form of cholesterol (Chol).
      • Despite having the same secondary 3 1 hydroxyl group as 2R, the epimeric 3 1 isomer 2S shows a less-red-shifted absorption band than 2R.
  • epimerism

  • nounɛˈpɪmərismɪˈpɪmərism
    Chemistry
    • Both epimerism and degree of oligomerization are important determinants of the antioxidant activity of flavan-3-ols and procyanidins.
      Example sentencesExamples
      • As shown in the above Table, epimerism did not occur in the present invention.

Definition of epimer in US English:

epimer

nounˈepəmər
Chemistry
  • Each of two isomers with different configurations of atoms around one of several asymmetric carbon atoms present.

    〔化〕差向(立体)异构体,差位(立体)异构体

    Example sentencesExamples
    • Yet, fungi could probably utilize the glucuronic acid residue in glucuronides as a carbon source because they can metabolize galacturonic acid, an epimer of glucuronic acid.
    • This study was not able to show any difference in the effect of KP - 23S and KP - 23R epimers on the bilayer.
    • Glucose and galactose are structurally similar, being epimers, while the lactose permease transports a wide variety of galactosides.
    • To our knowledge, this is the first example of two highly homologous enzymes belonging to the same gene family, and catalyzing the formation of two distinct epimers from a same substrate.
    • However, it has not been unraveled why so many different BChI homologs and epimers exist in chlorosomes and how they arrange themselves to form light-harvesting antennas.
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