| carb | carbohydrate; carbonate |
|---|---|
| BHN | bephenium hydroxynaphthoate; Brinell hardness number |
| KHN | Knoop hardness number |
| MHN | massive hepatic necrosis; Mohs hardness number; morbus hemolyticus neonatorum |
| RHN | Rockwell hardness number |
| CaCO3 | Calcium carbonate |
|---|---|
| Li2CO3 | Lithium Carbonate |
| CC | calcium carbonate |
| Brinell hardness number | A number related to the size of the permanent impression made by a ball indenter of specified size (usually 10 mm in diameter) pressed into the surface of the material under a specified load: where P = applied load in kg, D = diameter of the ball in mm, and d = diameter of the impression in mm. (05 Mar 2000) |
|---|---|
| hardness | <chemistry> Total concentration of calcium and magnesium ions, expressed as the equivalent concentration (mg/L) of calcium carbonate. Hard water is water that contains lots of calcium carbonate and other minerals. (09 Oct 1997) |
| hardness scale | A qualitative scale in which minerals are classified in order of their increasing hardness, based on the fact that the harder of two materials will scratch the softer and will not be scratched by it. The scale lists 15 substances: 1, talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, orthoclase, periclase; 7, vitreous pure silica; 8, quartz, stellite; 9, topaz; 10, garnet; 11, tantalum carbide, fused zirconia; 12, fused alumina; 13, silicon carbide; 14, boron carbide; 15, diamond. Synonym: Mohs scale. (05 Mar 2000) |
| Knoop hardness number | A number obtained by dividing the load in kg applied to a pyramid-shaped diamond of specific size divided by the projected area of the impression: KHN = L/A, where A= the projected area of the impression in mm2 and L= the load in kg; used for measurements of hardness of any materials, especially very hard and brittle substances such as tooth dentin and enamel. (05 Mar 2000) |
| aluminum carbonate | Basic, Al2O3CO2;an aluminum hydroxide-carbonate complex consisting of white lumps, insoluble in water; aqueous suspensions bind phosphorus in the intestine and lower serum inorganic phosphorus resulting in an increase in reabsorption of phosphorus by renal tubules and reduction of urinary excretion of phosphorus; it reduces formation of phosphatic urinary calculi and gastric acidity. (05 Mar 2000) |
| ammonium carbonate | A cardiac and respiratory stimulant and carminative expectorant. (05 Mar 2000) |
| bismuth carbonate | (BiO)2CO3;used for the same purposes as bismuth subnitrate, but has lower toxicity. Synonym: bismuth carbonate, bismuth oxycarbonate, bismuthyl carbonate. (05 Mar 2000) |
| bismuthyl carbonate | (BiO)2CO3;used for the same purposes as bismuth subnitrate, but has lower toxicity. Synonym: bismuth carbonate, bismuth oxycarbonate, bismuthyl carbonate. (05 Mar 2000) |
| calcium carbonate | An astringent, an antacid (27 Sep 1997) |
| carbonate | 1. A salt of carbonic acid. 2. The ion CO3=. (05 Mar 2000) |
| carbonate dehydratase | <enzyme> A zinc-containing enzyme of erythrocytes with molecular weight of 30 kD. It is among the most active of known enzymes and catalyses the reversible hydration of carbon dioxide, which is significant in the transport of co2 from the tissues to the lungs. The enzyme is inhibited by acetazolamide. Chemical name: Carbonate hydro-lyase Registry number: EC 4.2.1.1 (12 Dec 1998) |
| carbonate dehydratase inhibitor | An agent, usually chemically related to the sulfonamides, that inhibits the activity of carbonate dehydratase, producing a general decrease in the formation of H2CO3 in the tissues. See: acetazolamide, dichlorphenamide. Synonym: carbonic anhydrase inhibitor. (05 Mar 2000) |
| carbonate hydro-lyase | carbonic anhydrase |
| magnesium carbonate | Used in gastric and intestinal acidity and as a laxative. (05 Mar 2000) |
| precipitated calcium carbonate | CaCO3;used as an antacid in the management of peptic ulcers and other conditions of gastric hyperacidity. (05 Mar 2000) |
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