| wire-loop lesion | Thickening of the basement membrane, with fibrinoid staining, of scattered peripheral capillaries in renal glomeruli; characteristic of renal involvement in systemic lupus erythematosus; the appearance of an affected capillary wall resembles a loop used in microbiology. (05 Mar 2000) |
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| wire splint | A device to stabilise teeth loosened by accident or by a periodontal condition in the maxilla or mandible; a device to reduce and stabilise maxillary or mandibular fractures by applying it to both jaws and connecting it by intermaxillary wires or rubber bands. (05 Mar 2000) |
| wire-tailed | <zoology> Having some or all of the tail quills terminated in a long, slender, pointed shaft, without a web or barbules. Source: Websters Dictionary (01 Mar 1998) |
| wrought wire | A wire formed by drawing a cast structure through a die into a desired shape and size; used in dentistry for partial denture clasps and orthodontic appliances. (05 Mar 2000) |
| Cramer wire splint | A flexible splint consisting of two stout parallel wires with finer cross wires. Synonym: Cramer wire splint. (05 Mar 2000) |
| separating wire | A wire, usually of soft brass, used to gain separation between teeth. See: separation. (05 Mar 2000) |
| Kirschner's wire | An apparatus for skeletal traction in long bone fracture. Synonym: Kirschner's apparatus. (05 Mar 2000) |
| ligature wire | A soft thin wire of stainless steel used in dentistry to tie an archwire to band attachments or brackets. (05 Mar 2000) |
| light wire appliance | An orthodontic appliance utilizing small gauge labial wires with expansion and contraction loops formed into it and attached to bands fitted to individual teeth; sometimes called Begg light wire differential force technique. (05 Mar 2000) |
| anion exchange | The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. It takes place when Cl- is exchanged for OH- in desalting. The reaction is Cl- (in solution) + (OH- on anion exchanger+) → (Cl- on anion exchanger) + OH- (in solution); combined with cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and medicinally, to remove an anion (e.g., Cl-) from gastric contents or bile acids in the intestine. (05 Mar 2000) |
| anion exchange resin | <chemistry> A resin with fixed cationic groups which is used in chromatography to separate anionic molecules. A High molecular weight, insoluble polymers that contain functional anionic groups capable of undergoing exchange reactions. These resins are used for ion exchange chromatography, as gastric antacids, hypocholesteraemics, etc. (14 Aug 2000) |
| maternal-foetal exchange | Exchange of substances between the maternal blood and the foetal blood through the placental barrier. It excludes microbial or viral transmission. (12 Dec 1998) |
| cation exchange | The process by which a cation in a liquid phase exchanges with another cation present as the counter-ion of a negatively charged solid polymer (cation exchanger). A cation-exchange reaction in removal of the Na+ of a sodium chloride solution is RSO3-H+ + Na+ → RSO3-Na+ + H+ (R is the polymer, RSO3- is the cation exchanger); if this is combined with the anion-exchange reaction, NaCl is removed from the solution (desalting). Cation exchange may also be used chromatographically, to separate cations, and medicinally, to remove a cation; e.g., H+, from gastric contents, or Na+ and K+ in the intestine. See: anion exchange. (05 Mar 2000) |
| cation-exchange resin | See: cation exchange, cation exchanger. (05 Mar 2000) |
| cation exchange resins | High molecular weight insoluble polymers which contain functional cationic groups that are capable of undergoing exchange reactions; used in various types of chromatography; also to treat hyperkalaemia. (12 Dec 1998) |