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The Canadian formulation of Preparation H includes a yeast extract called Biodyne which was removed in 1995 from the formulation sold in the United States. This yeast extract was the primary ingredient of the original formulation by inventor George Sperti , [ 5 ] [ 6 ] and Pfizer believes that it removes wrinkles from skin and heals dry ...
Mercury(II) fulminate, or Hg(CNO) 2, is a primary explosive. It is highly sensitive to friction, heat and shock and is mainly used as a trigger for other explosives in percussion caps and detonators. Mercury(II) cyanate, though its chemical formula is identical, has a different atomic arrangement, making the cyanate and fulminate anionic isomers.
George Speri Sperti (January 17, 1900, Covington, Kentucky – April 29, 1991, Cincinnati, Ohio) was an Italian-American who invented Preparation H hemorrhoid medication. He also invented the Sperti Ultraviolet Lamp, Aspercreme for pain relief, and KVa Power Meter. [1] [2] Sperti graduated from the University of Cincinnati in 1923. Shortly ...
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a h = 347.64 pm c h = 673.20 pm ... Mercury is a chemical element ... The FDA has "inadequate data to establish general recognition of the safety and effectiveness ...
Zinc amalgam finds use in organic synthesis (e.g., for the Clemmensen reduction). [3] It is the reducing agent in the Jones reductor, used in analytical chemistry.Formerly the zinc plates of dry batteries were amalgamated with a small amount of mercury to prevent deterioration in storage.
The one acetate group that remains on the mercury atom can be displaced by chloride: [4] C 6 H 5 OH + Hg(O 2 CCH 3) 2 → C 6 H 4 (OH)–HgO 2 CCH 3 + CH 3 CO 2 H C 6 H 4 (OH)–HgO 2 CCH 3 + NaCl → C 6 H 4 (OH)–HgCl + NaO 2 CCH 3. The first such reaction, including a mercuration of benzene itself, was reported by Otto Dimroth between 1898 ...
Calomel is a mercury chloride mineral with formula Hg 2 Cl 2 (see mercury(I) chloride). It was used as a medicine from the 16th to early 20th century, despite frequently causing mercury poisoning in patients. [5] The name derives from Greek kalos (beautiful) and melas (black) because it turns black on reaction with ammonia. This was known to ...
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