(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.
Barium
Definition:
(n.) One of the elements, belonging to the alkaline earth group; a metal having a silver-white color, and melting at a very high temperature. It is difficult to obtain the pure metal, from the facility with which it becomes oxidized in the air. Atomic weight, 137. Symbol, Ba. Its oxide called baryta.
Example Sentences:
(1) The use of glucagon in double-contrast studies of the colon has been recommended for various reasons, one of which is to facilitate reflux of barium into the terminal ileum.
(2) The blocking action may have masked and hindered detection of the stimulatory action of barium in other systems.
(3) A 14-year-old case was reported with a primary postbulbar duodenal ulcer, which was confirmed by barium meal study and duodenoscopy.
(4) A case is presented with radiographically demonstrated angioedema in the stomach and small bowel accompanied by allergic rhinitis, which was apparently an allergic response to the barium sulfate suspension.
(5) Importance of the water and acid-barium tests (De Carvalho and Donner tests) was proved in a large series of cases demonstrating an unknown gastro-oesophageal reflux and an associated oesophagitis.
(6) The objective of this investigation was to determine the frequency of and predictors for inadequate barium enemas in the frail elderly.
(7) Only 31 percent of the patients had colonoscopy or double-contrast barium enema x-ray beyond the neoplastic area before surgery.
(8) We conclude that routine use of Golytely is preferable to methods involving catharsis and standard tap water enemas for barium enema examination, on the grounds that it is equally effective, yet more convenient for patients and for the radiology department, and reduces total costs.
(9) Barium (5 mM) had little effect and cobalt slightly reduced the ACh-induced Ca2+ response.
(10) It is suggested that small quantities of Gastrografin act as an accelerator of barium transit by causing the release of serotonin (5-hydroxytryptamine) from the small intestinal mucosa.
(11) Ferrihydrite was the predominant form of iron present in both ferritin and haemosiderin, while haemosiderin contained higher amounts of phosphorus, magnesium, calcium and barium, then either normal or ferrocene-loaded ferritin.
(12) The appendix or appendix stump was visualised on 53% of the barium examinations.
(13) Barium study demonstrated partial small bowel obstruction.
(14) It is concluded that barium ions have at least 2 points of attack in the ganglion: 1, on the soma membrane of the neurones, and 2, on the presynaptic terminals controlling them.
(15) The study outcome of primary interest was the radiologist's report of the adequacy of examination as indicated in the written summary of the results of the barium enema procedure.
(16) Information provided by postlaryngectomy barium swallow appeared to predict, but not prevent salivary fistula formation.
(17) The heart and lungs were removed, the pulmonary artery was injected with barium-gelatin, and the lung was fixed in formalin in the inflated state.
(18) Direct and radiographic observation and density measurements (cooled specimens, 2,000 g, p less than 0.01) verified that barium sulfate does accumulate at the bottom of the centrifugation tubes.
(19) Six months-2 years after operation, reflux into bile duct and rapid emptying were observed in some cases in barium examination, and abdominal pain was found in 10% of the patients.
(20) Electron energy-loss spectroscopic element-distribution images are acquired from cytochemical reaction products in a variety of cellular objects: (1) colloidal thorium particles in extra-cellular coat material, (2) iron-containing ferritin particles in liver parenchymal cells, (3) barium-containing reaction products in endoplasmic reticulum stacks, (4) elements present in lysosomal cerium- and barium-containing precipitates connected with acid phosphatase (AcPase) or aryl sulphatase (AS) enzyme activity.