(n.) Native sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins.
Example Sentences:
(1) In some populations the lamella is a phosphoprotein-rich structure devoid of crystalline mineral, and in others it is a glucosamine-rich structure often containing barite (BaSO4) inclusions.
(2) During this operation, drilling mud composed of a water slurry of barite (BaSO4) together with minor amounts of additives, among them chrome lignosulphonate and chrome lignite, was circulated between the borehole and the Shale Shaker House.
(3) These results indicate that a nontoxic dust such as barite generates toxic oxygen radicals at a minimal level that can be quenched by the normal cellular defense system.
(4) Oesophagography with baritate meal and oesophagoscopy also play a diagnostic role in oesophageal achalasia.
(5) In the present study, we have investigated the in vitro generation of oxygen free radicals from human neutrophils and rat alveolar macrophages stimulated with freshly fractured silica, aged silica, amosite, crocidolite, chrysotile, and nontoxic dust, barite.
(6) The relative toxicity index and ESR peak heights, on an equal surface area basis and normalized to barite as one, showed a direct relationship.
Barytes
Definition:
(n.) Barium sulphate, generally called heavy spar or barite. See Barite.
Example Sentences:
(1) Four men who mined barytes in Scotland and who developed pneumoconiosis are described.
(2) This conclusion was based on the finding that at pH values close to 7, where the adsorption from serum occurs, all samples with the exception of natural barytes were uncharged.
(3) Five of the affected men examined at intervals since their exposure to barytes ceased in 1964 showed marked clearing of their radiological abnormalities.
(4) Nine cases of baritosis occurring in a small factory in which barytes was crushed, graded, and milled are described.
(5) Optical and electron probe analysis showed that the crystalline material was crushed barytes containing small quantities of muscovite as is typical in natural deposits.
(6) It is based on barytic hydrolysis of material at 125 degrees C for 16 h, acidification of hydrolysate to pH 3 with HCl, high-performance liquid chromatography on Nova Pak C18 (Waters Assoc.
(7) The quartz was inhaled from rocks associated with the barytes in the mines.