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单词 protoporphyrin
释义

Definition of protoporphyrin in English:

protoporphyrin

noun ˌprəʊtə(ʊ)ˈpɔːf(ɪ)rɪn
Chemistry
  • Any of a group of fifteen isomeric porphyrins having the formula C₃₄H₃₄N₄O₄, in which the porphin nucleus has four methyl, two vinyl, and two propionic acid substituents; especially (more fully "protoporphyrin IX") the isomer which occurs widely in living organisms, mainly as haem (in which it is bonded to an iron atom).

Origin

1920s; earliest use found in Chemical Abstracts. From proto- + porphyrin, after German Protoporphyrin.

 
 

Definition of protoporphyrin in US English:

protoporphyrin

nounˌprəʊtə(ʊ)ˈpɔːf(ɪ)rɪn
Chemistry
  • Any of a group of fifteen isomeric porphyrins having the formula C₃₄H₃₄N₄O₄, in which the porphin nucleus has four methyl, two vinyl, and two propionic acid substituents; especially (more fully "protoporphyrin IX") the isomer which occurs widely in living organisms, mainly as haem (in which it is bonded to an iron atom).

Origin

1920s; earliest use found in Chemical Abstracts. From proto- + porphyrin, after German Protoporphyrin.

 
 
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更新时间:2024/12/23 20:35:20