| 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) |
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| 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) |
| porpita | <zoology> A genus of bright-coloured Siphonophora found floating in the warmer parts of the ocean. The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst. Origin: NL, from Gr. Brooch. Source: Websters Dictionary (01 Mar 1998) |
| porpoise | 1. <zoology> Any small cetacean of the genus Phocaena, especially P. Communis, or P. Phocaena, of Europe, and the closely allied American species (P. Americana). The colour is dusky or blackish above, paler beneath. They are closely allied to the dolphins, but have a shorter snout. Synonym: harbor porpoise, herring hag, puffing pig, and snuffer. 2. <zoology> A true dolphin (Delphinus); often so called by sailors. <zoology> Skunk porpoise, or Bay porpoise, a North American porpoise (Lagenorhynchus acutus), larger than the common species, and with broad stripes of white and yellow on the sides. Origin: OE. Porpeys, OF. Porpeis, literally, hog fish, from L. Porcus swine + piscis fish. See Pork, and Fish. Source: Websters Dictionary (01 Mar 1998) |
| porpoises | Mammals of the family phocoenidae comprising four genera and six species found in the north pacific ocean and both sides of the north atlantic ocean and in various other seas. They differ from dolphins in that porpoises have a blunt snout and a rather stocky body while dolphins have a beaklike snout and a slender, streamlined body. They usually travel in small groups. (12 Dec 1998) |
| porporino | A composition of quicksilver, tin, and sulphur, forming a yellow powder, sometimes used by mediaeval artists, for the sake of economy, instead of gold. Origin: It. Source: Websters Dictionary (01 Mar 1998) |
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| porphyric polyneuropathy |
Polyneuropathy resulting from acute porphyria, characterized by pains and paresthesias in the extremities and by flaccid paralysis.
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| porphin |
a heterocyclic structure composed of four pyrrole rings connected by methylidyne (—CH=) bridges; it is the parent skeleton of the porphyrins.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| porphobilinogen |
the immediate precursor of the porphyrins, a pyrrole ring with acetyl, propionyl, and aminomethyl side chains; four molecules of porphobilinogen are condensed to form one molecule of uroporphyrinogen III, which is then converted successively to coproporphyrinogen III, protoporphyrin IX, and heme. Porphobilinogen is produced in excess and excreted in the urine in acute intermittent porphyria and several other porphyrias. Abbreviated PBG.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| porphobilinogen deaminase |
hydroxymethylbilane synthase.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| porphobilinogen synthase |
[EC 4.2.1.24] an enzyme of the lyase class that catalyzes the condensation of two molecules of δ-aminolevulinate to form porphobilinogen in the synthesis of porphyrins. The enzyme is inhibited by minute quantities of lead poisoning. Genetic deficiency of the enzyme causes a porphyria similar to acute intermittent porphyria but with high urinary levels of δ-aminolevulinic acid, coproporphyrinogen III, and protoporphyrin but not porphobilinogen. Called also aminolevulinate dehydratase.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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