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Benzonatate (/ b ɛ n ˈ z oʊ n ə t eɪ t /), sold under the brand name Tessalon among others, is a medication that is used for the symptomatic relief of cough. [7] [8] Benzonatate is taken by mouth. [7] [5] Effects generally begin within 20 minutes and last 3 to 8 hours. [7] [3]
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A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
Therefore, the pearl industry is making ongoing attempts to improve culturing technique so that keshi pearls do not occur. All-nacre pearls may one day be limited to natural found pearls. [16] [17] [18] Today many "keshi" pearls are actually intentional, with post-harvest shells returned to the water to regenerate a pearl in the existing pearl sac.
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Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China. The U.S. Federal Trade Commission requires that farmed freshwater pearls be referred to as "freshwater cultured pearls" in ...
Historical treasures hidden for decades have been uncovered in the crypts of a cathedral, with items including burial crowns and insignia belonging to Medieval European rulers.