protohaemprotohemen.

Brit.

/ˈprəʊtəʊhiːm/, U.S.

/ˈproʊdoʊˌhim/

Forms: 1900s– protohaem, 1900s– protoheme (U.S.).

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: proto- comb. form, haem n.

Etymology: < proto- comb. form + haem n., after German Protohäm (H. Fischer et al. 1931, in Zeitschr. f. physiol. Chem. 195 21).

Biochemistry.

A haem complex containing a protoporphyrin bonded ionically to a ferrous iron (Fe²⁺) cation.

ΚΠ

1931 Chem. Abstr. 25 2157 By using a technic which excludes the possibility of oxidation, etioheme, protoheme, mesoheme and meso-ester heme were obtained cryst. from the corresponding porphyrins.

1963 C. H. Doering tr. P. Karlson Introd. Mod. Biochem. ix. 183 Peroxidases oxidize substrates by employing H₂O₂ as an oxidizing agent. Depending on their origin, they may contain either a red heme (protoheme or closely related ones) or a green heme.

1986 M. Kogut tr. H. G. Schlegel Gen. Microbiol. xiii. 400 The prosthetic group, the protohaem, is synthesised by the bacteroids.

2005 M. Wilson Microbial Inhabitants of Humans viii. 336 Porphyromonas spp...produce porphyrin pigments, and colonies on blood agar become black after several days incubation due to the production of protohaem.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protohaem
释义	protohaemprotohemen. Brit. /ˈprəʊtəʊhiːm/, U.S. /ˈproʊdoʊˌhim/ Forms: 1900s– protohaem, 1900s– protoheme (U.S.). Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: proto- comb. form, haem n. Etymology: < proto- comb. form + haem n., after German Protohäm (H. Fischer et al. 1931, in Zeitschr. f. physiol. Chem. 195 21). Biochemistry. A haem complex containing a protoporphyrin bonded ionically to a ferrous iron (Fe²⁺) cation. ΚΠ 1931 Chem. Abstr. 25 2157 By using a technic which excludes the possibility of oxidation, etioheme, protoheme, mesoheme and meso-ester heme were obtained cryst. from the corresponding porphyrins. 1963 C. H. Doering tr. P. Karlson Introd. Mod. Biochem. ix. 183 Peroxidases oxidize substrates by employing H₂O₂ as an oxidizing agent. Depending on their origin, they may contain either a red heme (protoheme or closely related ones) or a green heme. 1986 M. Kogut tr. H. G. Schlegel Gen. Microbiol. xiii. 400 The prosthetic group, the protohaem, is synthesised by the bacteroids. 2005 M. Wilson Microbial Inhabitants of Humans viii. 336 Porphyromonas spp...produce porphyrin pigments, and colonies on blood agar become black after several days incubation due to the production of protohaem. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1931
随便看	cornproduce cornproducing cornqueen cornrail cornrate cornrent cornrick cornriddle cornrig cornroast cornrose cornrow cornrowed cornrowing cornrows cornrubber cornrust corns cornsalad cornsalve cornsampler cornsedge cornsheller cornshelling cornship