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.

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.
随便看	make more prominent make more rigid make more rigorous make more secure make more serious make more severe make more stringent makems make much of make much of make much of make mucky make muddy/dirty make murky make music on make neater make neat/tidy make necessary make nervous make nice make nice make nice-nice make nice (or nice-nice) make nice (or nice-nice) make no bones 混充混凝土混合混合泳混合物混合面儿混同混战混搭混杂 Energieerzeuger Energieerzeugung Energiefluß Energieflußrichtung Energieform Energiefortleitung Energiefreigabe Energiegewinnung Energiegewinnung Energiegleichung