Amalgam (chemistry) with copper. A nitric acid solution of salts under investigation is applied to a piece of copper foil, and any mercury ions present will leave spots of silvery-coloured amalgam. Silver ions leave similar spots but are easily washed away, making this a means of distinguishing silver from mercury. The redox reaction involved where mercury oxidizes the copper is: Dental amalgam has been studied and is generally considered to be safe for humans, though the validity of some studies and their conclusions have been questioned. Amalgam (chemistry) An amalgam is an alloy of mercury with another metal, which may be a
Brefeldin A studying membrane traffic and [[Vesicle (biology and chemistry)|vesicle]] transport dynamics between the endoplasmic reticulum and Golgi apparatus. Brefeldin A is found naturally as a white to off-white [[crystal]]line solid. It forms a clear colorless solution when dissolved. It is soluble in [[methanol]] (10 mg/mL), [[ethanol]] (5 mg/mL), [[Dimethyl sulfoxide|DMSO]] (20 mg/mL), [[acetone]], and [[ethyl acetate]] (1 mg/mL) without the aid of heating. It is poorly soluble in water (slightly [[Miscibility|miscible]]). It is sold commercially with a purity of 98% or greater. It is recommended that it be stored desiccate at -20 °C away from direct sunlight. Its suggested shelf life