| HSR | Harleco synthetic resin; heated serum reagin; homogeneously staining region |
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| RHC | resin hemoperfusion column; respiration has ceased; right heart catheterization; right hypochondrium... |
| RT3U | resin triiodothyronine uptake |
| RU | radioulnar; rat unit; reading unit; residual urine; resin uptake; resistance unit; retrograde urogra... |
| RUR | resin-uptake ratio |
| resin | Any one of a class of yellowish brown solid inflammable substances, of vegetable origin, which are nonconductors of electricity, have a vitreous fracture, and are soluble in ether, alcohol, and essential oils, but not in water; specif, pine resin. Resins exude from trees in combination with essential oils, gums, etc, and in a liquid or semiliquid state. They are composed of carbon, hydrogen, and oxygen, and are supposed to be formed by the oxidation of the essential oils. Copal, mastic, quaiacum, and colophony or pine resin, are some of them. When mixed with gum, they form the gum resins, like asafetida and gamboge; mixed with essential oils, they frorm balsams, or oleoresins. <chemical> Highgate resin, a fossil resin resembling copal, occuring in blue clay at Highgate, near London. <botany> Resin bush, a low composite shrub (Euryops speciosissimus) of South Africa, having smooth pinnately parted leaves and abounding in resin. Origin: F. Resine, L. Resina; cf. Gr. Rhtinh. (10 Mar 1998) |
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| resin acids | A class of organic compounds derived from various natural plant resins; diterpenes containing a phenanthrene ring system; e.g., abietic acid, pimaric acid, ester gums. Synonym: resinic acids. (05 Mar 2000) |
| resin cement | A monomer or monomer/polymer system used as a dental luting agent; used in cementation of restorations or orthodontic brackets to the teeth. (05 Mar 2000) |
| resin cements | Dental cements composed either of polymethyl methacrylate or dimethacrylate, produced by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers. The cement is insoluble in water and is thus resistant to fluids in the mouth, but is also irritating to the dental pulp. It is used chiefly as a luting agent for fabricated and temporary restorations. (12 Dec 1998) |
| melamine resin | A plastic material mixed with plaster of Paris for casts. Such a cast is lighter and stronger than one made with plaster of Paris alone. Synonym: melamine formaldehyde. (05 Mar 2000) |
| chemically cured resin | A resin which contains an initiator, usually benzoyl peroxide, and an activator, usually a tertiary amine, in separate pastes. When mixed, the amine reacts with the benzoyl peroxide to form free radicals and polymerization occurs. (05 Mar 2000) |
| methacrylate resin | Polymerised methacrylic acid;a translucent plastic material, used for the manufacture of various medical appliances, surgical instruments, and seating components used in total joint replacement; it possesses the optical properties of fused quartz, and is readily molded when heated; formerly used in electron microscopy for embedding tissues, now superseded by epoxy resin's. (05 Mar 2000) |
| cholestyramine resin | A strongly basic anion-exchange resin in the chloride form, consisting of a copolymer of styrene and divinylbenzene with quaternary ammonium functional groups; it lowers the blood cholesterol by binding the bile acids in the intestine, thus promoting their excretion in the faeces instead of reabsorption from the bowel; used in the treatment of hypercholesterolaemia, xanthomatous biliary cirrhosis, and other forms of xanthomatosis. (05 Mar 2000) |
| gum resin | The dry exudate from a number of plants, consisting of a mixture of a gum and a resin, the former soluble in water but not alcohol, the latter soluble in alcohol but not water. (05 Mar 2000) |
| cold cure resin | Autopolymerizing resin, any resin that can be polymerised by chemical catalysis rather than by the application of heat; used in dentistry for dental restoration, denture repair, and impression trays. Synonym: activated resin, cold cure resin, cold-curing resin, quick cure resin, self-curing resin. (05 Mar 2000) |
| composite resin | A synthetic resin usually acrylic based, to which a glass or natural silica filter has been added. Used mainly in dental restorative procedures. Origin: L. Compositus, put together, fr. Compono, to put together (05 Mar 2000) |
| podophyllum resin | <botany> A powdered mixture of resins taken from dried seeds and root of the mayapple (Podophyllum peltatum), it is typically used as a topical caustic agent. (09 Oct 1997) |
| copolymer resin | Synthetic resin produced by joint polymerization of two or more different monomers or polymers. (05 Mar 2000) |
| polyamine-methylene resin | A synthetic acid-binding resin used as a gastric antacid. (05 Mar 2000) |
| polyester resin | Resin in which the polymers are insoluble in most organic solvents and are polymerised by light, heat, or oxygen; used in electron microscopy as a tissue embedding medium. (05 Mar 2000) |