| perforating folliculitis | Erythematous papules with a central keratin plug which are scattered on the arms, thighs, and buttocks; seen especially in diabetics on haemodialysis. See: hyperkeratosis follicularis et parafollicularis. (05 Mar 2000) |
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| perforating keratoplasty | Corneal transplant with replacement of all layers of the cornea, but retaining the peripheral cornea. Synonym: perforating keratoplasty. (05 Mar 2000) |
| perforating peroneal artery | Arterial branches which penetrate a wall or pass from the anterior to the posterior aspect or compartment of a structure such as the hand or foot to anastomose or be distributed. Synonym: ramus perforans, perforating peroneal artery. (05 Mar 2000) |
| perforating ulcer of foot | A round, deep, trophic ulcer of the sole of the foot, following disease or injury, in any part of its course from the centre to the periphery of the nerve supplying the part. Synonym: mal perforant. (05 Mar 2000) |
| perforating veins | The veins that accompany the perforating arteries from the profunda femoris artery; they drain blood from the vastus lateralis and hamstring muscles and terminate in the profunda femoris vein. Synonym: venae perforantes. (05 Mar 2000) |
| perforating wound | A wound with an entrance and exit opening. (05 Mar 2000) |
| perforation | 1. The act of boring or piercing through a part. 2. A hole made through a part or substance. Origin: L. Perforare = to pierce through (18 Nov 1997) |
| perforator | One who, or that which, perforates; especially, a cephalotome. Origin: Cf. F. Perforateur. Source: Websters Dictionary (01 Mar 1998) |
| perforatorium | A rod or fibrous cone located between the acrosome and the anterior pole of the nucleus in the spermatozoa of toads and birds; no corresponding structure evident in the subacrosomal space of mammalian spermatozoa. Origin: L. Per-foro, pp. -foratum, to bore, + -orium, instrumental suffix (05 Mar 2000) |
| perforin | <protein> Perforins 1 and 2 form tubular transmembrane complexes (16nm diameter) at the sites of target cell lysis by natural killer cells and cytotoxic T-cells. (10 Jan 1998) |
| performance | The act of performing; the carrying into execution or action; execution; achievement; accomplishment; representation by action; as, the performance of an undertaking of a duty. "Promises are not binding where the performance is impossible." (Paley) 2. That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; especially, an action of an elaborate or public character. "Her walking and other actual performances." "His musical performances." . Synonym: Completion, consummation, execution, accomplishment, achievement, production, work, act, action, deed, exploit, feat. Source: Websters Dictionary (01 Mar 1998) |
| performance test | A test, such as five of the eleven Wechsler adult intelligence scale subtests, requiring little or no verbal instruction from the examiner and virtually no verbal response by the examinee. (05 Mar 2000) |
| performic acid | H-CO-O-OH;an organic peracid used in cleaving disulfide links in peptides by oxidizing cysteine and cystine to cysteic acid. Synonym: peroxyformic acid. (05 Mar 2000) |
| performic acid reaction | Oxidative destruction of the ethylene double bond (-HC==CH-) which is converted to a Schiff-reactive double aldehyde; used to indicate the presence of unsaturated lipids, such as phospholipids and cerebrosides, as well as cystine-rich substances, such as keratin, in tissue sections. (05 Mar 2000) |
| perfrigeration | A minor degree of frostbite. Origin: L. Per-frigero, pp. -atus, to make cold, fr. Frigus, cold (05 Mar 2000) |