| pigmented part of retina | pigmented part of retina |
|---|---|
| pigmented purpuric lichenoid dermatosis | An eruption comprised of lichenoid papules variously pigmented from the haemosiderin of the associated purpura; found on the legs, usually in men over 40 years of age. Synonym: Gougerot and Blum disease. (05 Mar 2000) |
| pigmented retinal epithelium | Layer of unusual phagocytic epithelial cells lying below the photoreceptors of the vertebrate eye. The dorsal surface of the PRE cell is closely apposed to the ends of the rods and as discs are shed from the rod outer segment they are internalised and digested by the PRE. Do not have desmosomes or cytokeratins in some species. (18 Nov 1997) |
| pigmented villonodular synovitis | <radiology> Monoarthritis, young adults, erosions on BOTH sides of joint (!), probably inflammatory, haemosiderin deposited in synovium, articular cartilage preserved (despite extensive marginal erosions; similar to gout), NO calcification Differential diagnosis: TB (associated atrophy of muscle and bone), rheumatoid arthritis (symmetrical), synovial sarcoma (with or without calcified; outside joint), synovial osteochondromatosis (12 Dec 1998) |
| pigmentolysin | An antibody causing destruction of pigment. Origin: L. Pigmentum, pigment, + G. Lysis, a loosening (05 Mar 2000) |
| pigments | Any normal or abnormal colouring matter in plants, animals, or micro-organisms. (12 Dec 1998) |
| pigmentum nigrum | Melanin of the choroid coat of the eye. (05 Mar 2000) |
| pigmy | See Pygmy. Pigmy falcon. <zoology> Same as Falconet, 2 . Source: Websters Dictionary (01 Mar 1998) |
| Pignet's formula | See: Black's formula. (05 Mar 2000) |
| Pignet, Maurice-C | <person> French surgeon, *1871. See: Pignet's formula. (05 Mar 2000) |
| pignut | <botany> See Groundnut . The bitter-flavored nut of a species of hickory (Carya glabra, or porcina); also, the tree itself. Source: Websters Dictionary (01 Mar 1998) |
| pigskin | 1. The skin of a pig, used chiefly for making saddles; hence, a colloquial or slang term for a saddle. 2. <clinical sign> Soft skin in which follicles are widely dilated; seen in pretibial myxoedema. (08 Mar 2000) |
| pigsney | A word of endearment for a girl or woman. Alternative forms: pigsnie, pigsny, etc. Origin: Perh. A dim. Of Dan. Pige a girl, or Sw. Piga; or from E. Pig's eye. Source: Websters Dictionary (01 Mar 1998) |
| pigtail | One name for the covalent assembly of sugars linked to phosphatidyl inositol joined to the C terminal residue of many proteins by a modified ethanolamine residue. Also called a greasy foot. Another term for this modification is glypiation. The function of the pigtail is to act as the sole anchor of the protein to the external surface of the lipid bilayer. The moiety is added to the protein during co translational insertion into the endoplasmic reticulum membrane on the luminal side. The addition is synchronised with the removal of a large C terminal polypeptide sequence that is usually hydrophobic and could itself have formed a membrane anchor. The surface proteins of many unicellular protozoa very commonly have this modification, the best known being the variable surface glycoprotein of trypanosomes and of malaria parasites. Examples are probably present in all eukaryotic plasma membranes. (18 Nov 1997) |
| pigtail catheter | An angiographic catheter with a tightly curled end to reduce the impact of the injectant on the vessel wall. (05 Mar 2000) |