| porphyrin cytochrome c peroxidase | <enzyme> From yeast; haem group of cytochrome c peroxidase (EC 1.11.1.5) replaced by protoporphyrin ix Registry number: EC 1.11.1.- Synonym: pcc-peroxidase (26 Jun 1999) |
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| porphyrinogen carboxy-lyase | <enzyme> Consider uroporphyrinogen decarboxylase Registry number: EC 4.1.1.- (26 Jun 1999) |
| porphyrinogens | Colourless reduced precursors of porphyrins in which the pyrrole rings are linked by methylene (-ch2-) bridges. (12 Dec 1998) |
| porphyrinopathy | A syndrome which results from abnormal porphyrin metabolism such as acute porphyria. Synonym: porphyrism. Origin: porphyrin + G. Pathos, disease (05 Mar 2000) |
| porphyrins | A group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached. The nature of the side chain is indicated by a prefix, as uroporphyrin, haematoporphyrin, etc. The porphyrins, in combination with iron, form the haem component in biologically significant compounds such as haemoglobin and myoglobin. (12 Dec 1998) |
| porphyrinuria | Excretion of porphyrins and related compounds in the urine. Synonym: porphyruria, purpurinuria. (05 Mar 2000) |
| porphyrism | A syndrome which results from abnormal porphyrin metabolism such as acute porphyria. Synonym: porphyrism. Origin: porphyrin + G. Pathos, disease (05 Mar 2000) |
| porphyrite | <chemical> A rock with a porphyritic structure; as, augite porphyrite. Source: Websters Dictionary (01 Mar 1998) |
| porphyritic | <chemical> Relating to, or resembling, porphyry, that is, characterised by the presence of distinct crystals, as of feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline. Origin: Cf. F. Porphyritique. Source: Websters Dictionary (01 Mar 1998) |
| porphyrization | Grinding in a mortar (formerly on a slab of porphyry). (05 Mar 2000) |
| porphyrogenitism | The principle of succession in royal families, especially among the Eastern Roman emperors, by which a younger son, if born after the accession of his father to the throne, was preferred to an elder son who was not so born. Origin: LL. Porphyro genitus, fr. Gr.; purple + root of to be born. Source: Websters Dictionary (01 Mar 1998) |
| porphyromonas | A genus of gram-negative, anaerobic, nonsporeforming, nonmotile rods or coccobacilli. Organisms in this genus had originally been classified as members of the bacteroides genus but overwhelming biochemical and chemical findings indicated the need to separate them from other bacteroides species, and hence, this new genus was created. (12 Dec 1998) |
| porphyromonas gingivalis | A species of gram-negative, anaerobic, rod-shaped bacteria originally classified within the bacteroides genus. This bacterium produces a cell-bound, oxygen-sensitive collagenase and is isolated from the human mouth. (12 Dec 1998) |
| porphyruria | Excretion of porphyrins and related compounds in the urine. Synonym: porphyruria, purpurinuria. (05 Mar 2000) |
| porphyry | Origin: F. Porphyre, L. Porphyrites, fr. Gr. Like purple, fr. Purple. See Purple. <geology> A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as of feldspar or quartz, are disseminated. There are red, purple, and green varieties, which are highly esteemed as marbles. <zoology> Porphyry shell, a handsome marine gastropod shell (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry. Source: Websters Dictionary (01 Mar 1998) |